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GNDU QUESTION PAPERS 2021
BA/BSc 4
th
SEMESTER
PSYCHOLOGY
(Experimental Psychology-II)
Time Allowed: 3 Hours Maximum Marks: 75
Note: Aempt Five quesons in all, selecng at least One queson from each secon. The
Fih queson may be aempted from any secon. All quesons carry equal marks.
1. Explain the concept of Psychophysics. Describe Weber-Fechner Law along with concept
of AL and DL.
2. How will you determined AL and DL with the help of Method of Limits?
3. Explain the following:
(i) Encoding
(ii) Retrieval
(iii) Mneumonics
(iv) Implicit memory.
4. What do you mean by Forgeng? Describe the factors aecng Forgeng.
5. Describe the nature of problem solving. Discuss the role of set in problem solving.
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6. What do you understand by concept formaon? Explain the processes of concept
formaon.
7. Explain the concept of correlaon. Describe the dierent types of correlaon along with
characteriscs.
8. What steps you will take to calculate coecient of correlaon (r) with the help of
Product Moment Method?
GNDU ANSWER PAPERS 2021
BA/BSc 4
th
SEMESTER
PSYCHOLOGY
(Experimental Psychology-II)
Time Allowed: 3 Hours Maximum Marks: 75
Note: Aempt Five quesons in all, selecng at least One queson from each secon. The
Fih queson may be aempted from any secon. All quesons carry equal marks.
1. Explain the concept of Psychophysics. Describe Weber-Fechner Law along with concept
of AL and DL.
Ans: Psychophysics: Understanding the Bridge Between Mind and Senses
Imagine you are sitting in a quiet room. Suddenly, you hear a faint ticking sound of a clock
somewhere far away. Or think about being in a dark room where slowly your eyes adjust,
and you start seeing things that were earlier invisible. Or you are tasting tea and instantly
realize, “Oh! This one has more sugar than yesterday.”
How do we notice these tiny differences?
At what point does a sound become “hearable,” light become “visible,” or a change in taste
become “noticeable”?
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This is exactly what Psychophysics tries to understand.
Psychophysics is a branch of psychology that studies the relationship between physical
stimuli (like light, sound, weight, taste, smell) and our psychological experiences (what we
actually feel, see, hear, or notice). In simple words, it connects the outer world with the
inner world of our mind.
The idea behind psychophysics is that our senses do not react to everything in the same
way. Our brain needs a certain amount of stimulus to notice something. Sometimes, even
when there is a stimulus, we do not feel it unless it crosses a particular level.
Psychophysics mainly tries to answer three questions:
1. When do we first notice a stimulus?
2. How much change in a stimulus is required to feel a difference?
3. How does the strength of a stimulus relate to our psychological experience of it?
To answer these questions, psychologists introduced some important concepts such as
Absolute Threshold, Difference Threshold (JND) and the famous Weber–Fechner Law.
Absolute Threshold (AL): The Minimum We Can Sense
Absolute Threshold (often written as AL or AT) means the smallest amount of stimulus
energy needed for us to notice something at all.
It is the point at which a stimulus goes from undetectable to detectable.
For example:
• The softest sound you can hear in a silent room
• The dimmest light you can see in darkness
• The smallest amount of sugar you can taste in water
• The weakest perfume smell you can sense
Scientifically, Absolute Threshold is defined as:
“The minimum intensity of a stimulus that can be detected 50% of the time.”
Why 50%?
Because sometimes we may sense it and sometimes we may not. Human senses are not
perfect machines. They vary with attention, fatigue, mood, and environment. So
psychologists agreed on 50% as a fair point.
Everyday Examples of Absolute Threshold
• A candle flame seen from 48 km away on a dark night (classic psychology example)
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• A watch ticking heard in a quiet room
• One drop of perfume spreading in an entire 3-room apartment
Absolute threshold tells us the starting point of sensation — when something just enters
our awareness.
Difference Threshold (DL): The Just Noticeable Difference (JND)
Once you can sense something, the next question is:
How much change in that stimulus is needed for you to notice the difference?
This is called Difference Threshold, also known as Just Noticeable Difference (JND).
In simple words, DL or JND means:
“The smallest difference between two stimuli that a person can detect.”
Examples make it easier:
• If you are holding 1 kg weight, how much extra weight must be added before you
say, “Now it feels heavier”?
• If your TV volume is on 10, how much must you increase it before you feel it is
louder — 11, 12, or 15?
• If your tea already has 2 spoons of sugar, how much more sugar must be added to
feel a difference?
DL shows that our brain does not react to tiny changes unless they cross a certain level.
Weber’s Law: The Idea of Proportion
A German psychologist named Ernst Weber carefully studied difference threshold and made
an important discovery.
He found that the amount of change needed to notice a difference does not depend on
the absolute amount of stimulus, but on its proportion.
In short:
We do not notice absolute change; we notice relative change.
This is called Weber’s Law.
Mathematically, Weber stated:
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The ratio of the increment threshold (ΔI) to the background intensity (I) is constant.
Symbolically,
ΔI / I = K
Where
ΔI = amount of change needed to notice difference
I = original stimulus intensity
K = constant (different for different senses)
Simple Examples to Understand Weber’s Law
If you are holding 100 grams, adding 5 grams may make you notice the difference.
But if you are carrying 10 kg, adding 5 grams will make no difference. You may need to add
around 500 grams to notice.
So, the heavier the thing, the more change is required to feel the difference.
If your room is dark and you turn on a small bulb, it feels extremely bright.
But in a fully lit stadium, switching on one extra light hardly makes any difference.
So Weber’s Law tells us that our senses respond to percentage change, not fixed change.
Fechner’s Law: Linking Stimulus and Sensation
Another psychologist, Gustav Fechner, expanded Weber’s idea. He said:
• Sensation increases as the logarithm of stimulus intensity increases.
Meaning?
When stimulus increases a little, sensation increases a lot initially.
But as stimulus keeps increasing, the sensation grows slowly.
For example:
• The first bite of chocolate gives great pleasure.
• The tenth bite still tastes good but not as exciting.
• The twentieth bite feels almost normal.
Similarly:
• A small increase in light in darkness feels huge.
• But the same increase in already bright light hardly matters.
So Fechner helped explain how physical energy becomes psychological experience.
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Connecting Everything Together
Psychophysics helps us understand:
• Why we cannot hear tiny sounds but can hear loud ones
• Why we do not notice small changes in weight, sound, or taste unless change is
sufficient
• Why our senses work relative to environment, not absolutely
Absolute Threshold tells us:
When sensation begins
Difference Threshold tells us:
When we notice change
Weber–Fechner Law explains:
How sensation grows with stimulus in a systematic, measurable way
Conclusion
Psychophysics beautifully connects the physical world with the mental world. It explains
how our senses detect, interpret, and respond to different stimuli. Through concepts like
Absolute Threshold, Difference Threshold, and Weber–Fechner Law, psychologists proved
that human senses follow scientific principles and measurable laws. These ideas not only
help in psychology but are also widely used in fields like marketing, sound engineering,
vision testing, product design, and even mobile phone volume settings.
So, psychophysics reminds us that our experience of the world is not simply what exists
outside—it is what our brain allows us to perceive.
2. How will you determined AL and DL with the help of Method of Limits?
Ans: Understanding AL and DL with the Method of Limits
Imagine you’re sitting in a quiet room. Suddenly, a faint sound begins—so soft that you’re
not sure if you heard it. The experimenter increases the sound gradually until you say, “Yes,
I can hear it now.” That moment marks your Absolute Threshold (AL)—the minimum
intensity of a stimulus that you can detect.
Now imagine another situation. You’re listening to a steady tone. The experimenter
increases the loudness slightly and asks, “Do you notice any difference?” At first, you don’t.
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But after a small increase, you say, “Yes, now it sounds louder.” That point marks your
Difference Threshold (DL)—the smallest change in stimulus intensity that you can detect.
Both AL and DL are fundamental concepts in psychophysics, the branch of psychology that
studies the relationship between physical stimuli and human perception. And one of the
most widely used techniques to measure them is the Method of Limits.
What is the Method of Limits?
The Method of Limits is a psychophysical technique developed by Gustav Fechner, often
considered the father of psychophysics. It is used to determine thresholds of sensation by
gradually increasing or decreasing the intensity of a stimulus until the participant’s response
changes.
In simple words: The experimenter presents stimuli in ascending or descending order
and notes the point at which the participant detects or fails to detect the stimulus.
Determining Absolute Threshold (AL) with Method of Limits
The Absolute Threshold (AL) is the lowest intensity of a stimulus that a person can detect at
least 50% of the time. Let’s see how the Method of Limits helps us find it.
1. Ascending Series
• The experimenter starts with a stimulus so weak that the participant cannot detect
it.
• The intensity is gradually increased step by step.
• The participant says “Yes” when they first detect the stimulus. Example: A sound
starts at 0 decibels and increases until the participant hears it at 15 decibels.
2. Descending Series
• The experimenter starts with a stimulus strong enough to be easily detected.
• The intensity is gradually decreased step by step.
• The participant says “No” when they can no longer detect the stimulus. Example:
A light starts bright and is dimmed until the participant says they can’t see it
anymore.
3. Repeating Trials
• Several ascending and descending trials are conducted to avoid bias.
• The points of detection (“Yes” responses) and non-detection (“No” responses) are
recorded.
4. Calculating AL
• The average of the transition points (where detection changes) across trials is taken.
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• This average represents the Absolute Threshold.
In everyday terms: AL is the faintest sound, dimmest light, or weakest touch you can
reliably sense.
Determining Difference Threshold (DL) with Method of Limits
The Difference Threshold (DL), also called the Just Noticeable Difference (JND), is the
smallest change in stimulus intensity that a person can detect.
1. Standard Stimulus
• A baseline stimulus is presented (e.g., a tone at 50 decibels).
2. Ascending Series
• The experimenter gradually increases the intensity of the stimulus above the
standard.
• The participant says “Yes” when they notice the difference. Example: The tone is
raised step by step until the participant says, “Now it sounds louder.”
3. Descending Series
• The experimenter gradually decreases the intensity below the standard.
• The participant says “Yes” when they notice the difference. Example: The tone is
lowered until the participant says, “Now it sounds softer.”
4. Repeating Trials
• Several ascending and descending trials are conducted.
• The points at which differences are noticed are recorded.
5. Calculating DL
• The average of the transition points is taken.
• This average represents the Difference Threshold (DL).
In everyday terms: DL is the smallest change in brightness, loudness, or weight that you
can detect.
A Relatable Story
Let’s imagine a psychology lab where a student named Riya volunteers for an experiment.
• First, the experimenter plays a faint beep. Riya doesn’t hear it. The sound grows
louder step by step until she says, “Yes, I hear it now.” That’s her Absolute Threshold
(AL) for sound.
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• Next, the experimenter plays a steady beep at 50 decibels. He increases the loudness
slightly. At first, Riya doesn’t notice. But when it reaches 55 decibels, she says, “Yes,
now it’s louder.” That’s her Difference Threshold (DL).
Through this simple process, the experimenter has measured Riya’s sensitivity to sound
using the Method of Limits.
Advantages of the Method of Limits
• Simple and easy to use.
• Efficient: Provides quick estimates of thresholds.
• Flexible: Can be applied to different senses (vision, hearing, touch, taste).
Limitations of the Method of Limits
• Response bias: Participants may anticipate when to say “Yes” or “No.”
• Adaptation: Repeated exposure may change sensitivity.
• Errors of habituation: Participants may keep saying “Yes” or “No” longer than they
should.
To reduce these errors, experimenters often mix ascending and descending trials
randomly.
Final Thoughts
The Method of Limits is a cornerstone of psychophysics. It helps us measure two key
aspects of sensation:
• Absolute Threshold (AL): The minimum intensity of a stimulus that can be detected.
• Difference Threshold (DL): The smallest change in stimulus intensity that can be
detected.
By presenting stimuli in ascending and descending order, recording responses, and
averaging transition points, psychologists can determine how sensitive humans are to the
world around them.
3. Explain the following:
(i) Encoding
(ii) Retrieval
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(iii) Mneumonics
(iv) Implicit memory.
Ans: Forgetting: Meaning and Factors Affecting It
Imagine preparing for an exam. You study late into the night, memorizing formulas and
definitions. But when you sit down to write the paper the next morning, some of those
formulas seem to have vanished from your mind. You know you studied them, yet they feel
out of reach. This everyday experience captures the essence of forgetting.
What is Forgetting?
In psychology, forgetting means the inability to recall or recognize information that was
once learned or stored in memory. It is the opposite of remembering.
In simple words: Forgetting is when knowledge or experiences that were once available
in memory become inaccessible.
It doesn’t always mean the memory is erased—it may still exist but cannot be retrieved at
the moment. For example, you may forget someone’s name during a conversation but
remember it later when prompted.
Nature of Forgetting
• Universal: Everyone forgets; it is a natural part of human memory.
• Gradual or sudden: Sometimes forgetting happens slowly over time, and sometimes
instantly.
• Partial or complete: You may forget details but remember the gist, or forget
entirely.
• Normal or abnormal: Forgetting is normal, but excessive forgetting (like in amnesia)
is abnormal.
Forgetting is not always negative. It helps us clear unnecessary information and focus on
what matters.
Factors Affecting Forgetting
Psychologists have studied why we forget, and several factors have been identified. Let’s
explore them one by one, with relatable examples.
1. Time (Decay Theory)
Memories fade with time if they are not used.
• Just like ink fades on paper, memory traces weaken when not recalled.
• This is called the decay theory.
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Example: You may forget a childhood friend’s phone number because you haven’t used
it for years.
2. Interference
Other memories can interfere with recall.
• Proactive interference: Old memories block new ones. Example: You keep
writing last year’s date even after the new year begins.
• Retroactive interference: New memories block old ones. Example: After learning
a new password, you forget the old one.
Interference is one of the strongest causes of forgetting.
3. Lack of Attention
If you don’t pay attention while learning, the memory is weak. Example: If you were
distracted while listening to instructions, you may forget them later.
4. Repression (Motivated Forgetting)
Sometimes we unconsciously push unpleasant memories out of awareness.
• Sigmund Freud called this repression.
• Painful or traumatic experiences may be forgotten as a defense mechanism.
Example: A person may forget details of a traumatic accident because recalling them is
too painful.
5. Failure of Retrieval
Sometimes the memory is stored but cannot be accessed.
• This is like having a book in a library but not finding it on the shelf.
• Retrieval cues (like reminders) can help recall.
Example: You forget a word during a conversation but remember it later when someone
mentions a related topic.
6. Poor Encoding
If information was not encoded properly at the time of learning, it cannot be recalled.
Example: If you only glanced at a textbook without understanding, you may forget the
content quickly.
7. Emotional Factors
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Strong emotions can affect memory.
• Anxiety, stress, or depression may block recall.
• Positive emotions can enhance memory, while negative emotions may hinder it.
Example: Nervousness during an exam may cause you to forget answers you knew well.
8. Health and Biological Factors
Physical conditions also affect memory.
• Brain injury, illness, or aging can cause forgetting.
• Lack of sleep, poor nutrition, or substance abuse weakens memory.
Example: Elderly people may forget names due to age-related decline in memory.
9. Disuse
Memories that are not recalled or practiced tend to fade. Example: If you don’t practice
a foreign language, you may forget vocabulary over time.
10. Overlearning and Similarity
Sometimes too much repetition or similarity between materials causes confusion.
Example: Learning two similar mathematical formulas may cause mixing them up.
A Relatable Story
Let’s imagine a student named Meera. She studies history for her exam.
• At first, she remembers all the dates.
• But after a week, some dates fade because of time decay.
• While revising, she confuses the dates of two wars due to interference.
• On exam day, nervousness causes retrieval failure—she knows the answer but can’t
recall it.
• Later, when relaxed, the answer suddenly comes back to her mind.
Meera’s experience shows how multiple factors combine to cause forgetting.
Importance of Studying Forgetting
Understanding forgetting helps us:
• Improve learning techniques.
• Use repetition and practice to strengthen memory.
• Avoid interference by organizing study material.
• Manage stress and emotions to recall better.
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• Recognize abnormal forgetting and seek medical help.
Forgetting is not just a weakness—it teaches us how memory works and how to improve
it.
Final Thoughts
Forgetting is the natural loss of accessibility to stored information. It is influenced by time,
interference, attention, repression, retrieval failure, poor encoding, emotions, health,
disuse, and similarity.
While forgetting can be frustrating, it is also essential. It helps us let go of unnecessary
details and focus on important ones. By understanding the factors that cause forgetting, we
can adopt strategies to strengthen memory—like regular practice, healthy lifestyle, and
stress management.
4. What do you mean by Forgeng? Describe the factors aecng Forgeng.
Ans: Memory Made Simple: Understanding Encoding, Retrieval, Mnemonics, and Implicit
Memory
Have you ever wondered how you remember your best friend’s name, your favourite song
lyrics, or the answer to a question during an exam? All of this happens because of a
wonderful system inside your brain called memory. Memory is not just one simple thing. It
has different processes and techniques that help us learn, store, and recall information. To
understand memory properly, four important terms are very useful: Encoding, Retrieval,
Mnemonics, and Implicit Memory. Let’s understand each of them in a simple and
interesting way.
(i) Encoding – The First Step of Memory
Imagine you are reading a chapter, watching a movie, or listening to your teacher. How does
this information enter your brain? This first step is called encoding.
Encoding means converting information from the world around us into a form that our
brain can understand and store.
Just like a computer changes your typed letters into digital data before saving it, our brain
also changes information into a mental code. Without encoding, nothing can be
remembered.
Types of Encoding
Our brain uses different ways to encode information:
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Visual Encoding – When we remember things that we see
For example, remembering the face of a friend, the diagram in your book, or the scene of a
place you visited.
Auditory Encoding – When we remember sounds and words
For example, remembering a song, your teacher’s voice, or a dialogue from a movie.
Semantic Encoding – When we remember the meaning of something
This is the strongest form of encoding. For example, remembering that “Mahatma Gandhi
led India’s freedom struggle” because we understand its meaning, not just the words.
Why Encoding Is Important
If encoding is weak, memory becomes weak. Have you ever read something quickly and
forgot it immediately? That happened because your brain did not encode it properly. On the
other hand, when you focus, understand, and relate new information to what you already
know, encoding becomes stronger, and memory improves greatly.
(ii) Retrieval – Bringing Memory Back
Once information is stored in the brain, we need to bring it back when required. This
process is called retrieval.
Retrieval means recalling or accessing stored information from memory whenever we
need it.
Think about the moment you sit in an exam hall and try to remember the answers. Or when
someone asks your name or address, and you tell them immediately. This happens because
your brain successfully retrieves the stored information.
Types of Retrieval
There are mainly two ways retrieval happens:
Recall
This is when we remember something without any clue. For example, writing answers in an
exam, remembering a phone number, or recalling a poem without reading it.
Recognition
This is when we identify information when we see or hear it again. For example, recognizing
a face in a crowd or choosing the correct answer in multiple-choice questions.
Why Retrieval Sometimes Fails
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Have you ever felt, “I know this… it’s on the tip of my tongue!” but you still couldn’t
remember? This happens when retrieval gets blocked. Stress, lack of attention, fear during
exams, or weak encoding can disturb retrieval.
Practicing revision, staying calm, and understanding instead of rote learning can improve
retrieval power.
(iii) Mnemonics – Smart Tricks to Remember Better
Sometimes the brain needs a little help to remember things easily. Mnemonics are special
memory tricks that make remembering fun and powerful.
Mnemonics are techniques or strategies that help us remember information more easily
by associating it with something meaningful, funny, or familiar.
They make learning interesting instead of boring. Students use them most during exams
without even realizing it.
Common Types of Mnemonics
Acronym Method
We take the first letters of words and create a new word.
Example:
To remember Rainbow colours – VIBGYOR (Violet, Indigo, Blue, Green, Yellow, Orange, Red)
Acrostic Method
We make a sentence where each word begins with the required letters.
Example:
To remember planets:
My Very Educated Mother Just Served Us Noodles
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
Rhymes and Songs
Our brain loves rhythm. That’s why we remember song lyrics easily.
Example: Children remember alphabets using the ABC song.
Visualization
Creating a strong mental image helps memory.
If you want to remember “Apple, Dog, Mountain,” imagine a dog eating an apple on top of a
mountain — funny but unforgettable!
Chunking
Breaking long information into small groups helps.
Example: 987654321 is easier to remember as 987-654-321
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Why Mnemonics Help
Mnemonics make learning enjoyable, meaningful, and organized. They reduce burden and
improve long-term memory.
(iv) Implicit Memory – Memory Without Awareness
Not all memories require effort to remember. Some memories work automatically, without
conscious thinking. This is called implicit memory.
Implicit memory is the type of memory that influences our actions and skills without us
being aware of it.
You don’t sit and “think” how to walk or ride a bicycle every time. Your body just does it
automatically because implicit memory is working.
Examples of Implicit Memory
✔ Riding a bicycle
✔ Typing without looking at keyboard
✔ Brushing teeth
✔ Driving a vehicle
✔ Playing a musical instrument
✔ Saying common words in your mother tongue
We learned these skills earlier, and now they happen effortlessly.
How Implicit Memory Is Different
Unlike normal remembering, implicit memory doesn’t require conscious recall. It is stored
deeply in the brain and lasts very long. Even people with memory loss diseases like amnesia
often still retain implicit memory, such as walking or basic habits.
Conclusion
Memory is like a magical system that helps us learn, live, and function every day. Encoding
helps us take information inside, retrieval helps us bring it back when needed, mnemonics
make remembering easier and interesting, while implicit memory silently supports our daily
habits and skills without effort.
Understanding these simple concepts not only helps in exams but also improves real-life
learning power. If we learn with meaning, stay attentive, revise smartly, and use memory
tricks, our brain can remember much more than we think!
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5. Describe the nature of problem solving. Discuss the role of set in problem solving.
Ans: Describe the Nature of Problem Solving. Discuss the Role of Set in Problem Solving
Problem solving is something every human does every single day, often without even
realizing it. When you wake up late and quickly decide how to get ready faster, when a
student struggles with a math question, when a doctor diagnoses a patient, or when a
person tries to fix a broken mobile phone—each of these situations involves problem
solving. In psychology, problem solving refers to the mental process through which we
identify a problem, understand it, develop possible solutions, evaluate them, and finally
choose the best one. It is not just about finding answers but about thinking, analyzing,
deciding, and acting in the right direction.
Nature of Problem Solving
1. Goal-Oriented Process
Every problem arises because there is a difference between the present situation and the
desired goal. The mind always tries to remove this gap. For example, if a student wants to
score good marks but does not understand a chapter, the “gap” becomes the problem. So
problem solving always has a goal behind it.
2. Cognitive or Thinking Process
Problem solving is a thinking-based activity. It involves understanding the situation, recalling
previous knowledge, comparing options, using logic, and sometimes even imagination. It is
not mechanical; it requires active mental participation.
3. Involves Steps or Stages
Problem solving does not happen instantly. It usually follows a sequence of steps:
1. Identifying the problem
2. Understanding the problem deeply
3. Planning possible solutions
4. Trying out the solutions
5. Evaluating which solution works best
This is why psychologists consider problem solving a systematic and organized process.
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4. Requires Understanding, Not Just Memory
Memorization alone cannot solve problems. For example, if a math student only learns
formulas without understanding concepts, solving new types of questions becomes difficult.
Problem solving demands understanding, reasoning, creativity, and logical thinking.
5. Influenced by Experience and Knowledge
A person who has more experience related to a situation usually solves problems better. For
example, a mechanic who has repaired hundreds of bikes can easily detect faults, while a
beginner may struggle. Thus, prior learning and experience shape the quality of problem
solving.
6. Can Be Trial and Error or Insightful
Sometimes we keep trying different solutions until something works. This is called trial and
error. For example, when a child first learns to open a new type of lock, he may try many
keys until one fits.
But sometimes solutions come suddenly in a “flash” moment, like a sudden idea. This is
called insight. The famous story of Archimedes shouting “Eureka!” when he suddenly
discovered the principle of buoyancy is a good example.
7. Emotional and Motivational Factors Matter
A confident, motivated person solves problems faster than someone who is afraid or
doubtful. Anxiety, fear of failure, stress, or laziness can reduce problem-solving ability. On
the other hand, patience, confidence, and determination improve it.
8. Social and Cultural Influence
Even society influences problem solving. People belonging to technologically advanced
cultures may develop better logical and technical problem-solving skills, while those in
traditional societies may excel in practical, daily life problem solving.
Role of “Set” in Problem Solving
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Now let us understand the second part of the question—what is “set” and how does it
affect problem solving?
In psychology, “set” refers to a person’s mental readiness, habit, tendency, or fixed way of
thinking while approaching a problem. It is like wearing mental spectacles—how we “set”
our mind decides how we look at the problem and how we try to solve it.
Set develops through experience, practice, learning, and repetition. It may help us, but
sometimes it can also create difficulties. There are two major types of set:
1. Positive Role of Set in Problem Solving
(i) Saves Time and Effort
When we repeatedly deal with similar types of problems, our brain develops a ready-made
pattern to solve them. This helps us solve problems quickly. For example, an experienced
math student instantly knows how to approach algebraic equations because of mental set
formed through practice.
(ii) Provides Confidence
When we have solved similar problems earlier, we feel confident. A doctor treating a
familiar disease already has an idea of what medicines to prescribe. This confidence
improves decision making.
(iii) Helps in Habit Formation and Skill Development
Mental set leads to expertise. Typists, drivers, athletes, teachers, programmers—everyone
becomes efficient because their mind develops fixed problem-solving strategies through
repetition.
2. Negative Role of Set in Problem Solving (Mental Rigidity)
Sometimes mental set becomes a barrier instead of a help. When we become too rigid in
thinking, we fail to see new possibilities. This is called mental rigidity or functional
fixedness.
(i) Prevents Creative Thinking
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If we are stuck with only one method, we ignore better solutions. For example, if a student
always solves math problems using long methods, he may fail to notice a short trick.
(ii) Leads to Wrong Assumptions
Sometimes we assume that a problem is similar to older ones and apply the same solutions
without analyzing the new situation properly. This results in mistakes.
(iii) Reduces Insight
A rigid mental set blocks sudden insight. The mind becomes closed and refuses to think
differently.
Example to Understand the Role of Set
Imagine a student solving a puzzle. He always tries to solve puzzles in one fixed pattern
because earlier it worked. But this new puzzle needs a different strategy. His fixed “set”
misguides him. However, another student who is open-minded and flexible quickly changes
strategies and solves it easily. This shows that while set can help, it can also hinder problem
solving if it becomes rigid.
How to Overcome Negative Effects of Set?
To improve problem solving, a person must:
• Stay open-minded
• Be flexible in thinking
• Be willing to try new approaches
• Analyze every problem freshly
• Avoid blindly following old habits
• Encourage creativity and curiosity
Conclusion
Problem solving is a complex but natural human ability. It involves understanding a
situation, thinking logically, planning carefully, and choosing the best solution. It is
influenced by knowledge, experience, emotions, intelligence, and environment.
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The concept of set plays a very important role in problem solving. A positive mental set
helps us work faster, confidently, and efficiently. However, a rigid or fixed mental set can
block creativity and cause incorrect solutions. Therefore, successful problem solvers
maintain a balance: they use experience when helpful but also remain flexible and open to
new ideas.
6. What do you understand by concept formaon? Explain the processes of concept
formaon.
Ans: Concept Formation: Meaning and Processes
Imagine a child seeing different animals for the first time. She notices that cats, lions, and
tigers all have four legs, sharp teeth, and whiskers. Slowly, she begins to group them
together in her mind as “cats” or “felines.” This mental ability to organize experiences into
meaningful categories is called concept formation.
Concept formation is one of the most important cognitive processes. It allows us to simplify
the complex world around us, recognize patterns, and make decisions. Without concepts,
every new experience would feel confusing and overwhelming.
What is Concept Formation?
In psychology, concept formation refers to the mental process by which we learn to classify
objects, events, or ideas into categories based on common features.
In simple words: Concept formation is how we learn to group things together and give
them meaning.
For example:
• The concept of “chair” includes wooden chairs, plastic chairs, office chairs, and even
beanbags—because they all serve the function of sitting.
• The concept of “honesty” includes telling the truth, keeping promises, and being fair.
Concepts are the building blocks of thought. They help us communicate, reason, and learn.
Importance of Concept Formation
• Simplifies reality: Instead of remembering every single detail, we group similar
things.
• Supports communication: Concepts allow us to use words meaningfully.
• Guides behavior: Concepts help us predict and respond appropriately.
• Foundation of learning: All education depends on forming and refining concepts.
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Without concept formation, learning mathematics, science, or even social rules would
be impossible.
Processes of Concept Formation
Psychologists have studied how concepts are formed, and several processes have been
identified. Let’s explore them step by step, with relatable examples.
1. Perception and Attention
The first step in concept formation is perception—noticing the features of objects or events.
• We pay attention to similarities and differences.
• Important features stand out, while irrelevant ones are ignored.
Example: A child notices that all birds have wings and can fly, even though they differ in
color or size.
Attention helps us focus on defining characteristics.
2. Abstraction
Abstraction means separating essential features from non-essential ones.
• We ignore irrelevant details and focus on what matters.
• This allows us to generalize across different examples.
Example: When forming the concept of “triangle,” we ignore color, size, or material and
focus only on the fact that it has three sides.
3. Generalization
Generalization is the process of applying a concept to new situations.
• Once we know the essential features, we recognize them in new examples.
• This helps us expand the concept beyond specific cases.
Example: After learning that dogs bark, a child generalizes the concept to include all
breeds—even those she has never seen before.
4. Discrimination
Discrimination means distinguishing between similar concepts.
• It prevents confusion by identifying differences.
• Without discrimination, we might mix up categories.
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Example: A child learns to discriminate between “cats” and “dogs” even though both
have four legs and fur.
5. Trial and Error Learning
Concepts are often formed through trial and error.
• We test our ideas, make mistakes, and refine our understanding.
• Feedback helps us correct errors.
Example: A child may call a cow a “dog” at first, but after correction, she learns the
difference.
6. Language
Language plays a crucial role in concept formation.
• Words act as labels for concepts.
• They help us store, recall, and communicate concepts easily.
Example: The word “fruit” helps us group apples, bananas, and mangoes together, even
though they look different.
7. Experience and Learning
Concepts are shaped by experience.
• Direct experience (touching, seeing, hearing) strengthens concepts.
• Indirect experience (reading, listening) also contributes.
Example: A child learns the concept of “fire” by seeing flames, feeling warmth, and
hearing warnings.
8. Comparison and Categorization
We compare objects and categorize them based on similarities and differences.
• Categorization is the final step where concepts are organized into mental groups.
Example: We categorize vehicles into cars, buses, trucks, and bikes based on their
features.
A Relatable Story
Let’s imagine a student named Arjun learning geometry.
• At first, he sees different shapes—triangles, squares, circles.
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• He pays attention to their sides and angles.
• Through abstraction, he realizes that triangles always have three sides.
• He generalizes this to all triangles, whether big or small.
• He learns to discriminate between triangles and squares.
• Through trial and error, he sometimes mislabels shapes but improves with practice.
• With the help of language, he uses the word “triangle” confidently.
• His experience with drawing and measuring strengthens the concept.
• Finally, he categorizes triangles as part of the larger group of polygons.
Arjun’s journey shows how concept formation is a step-by-step process that transforms raw
perception into organized knowledge.
Factors Influencing Concept Formation
• Age and development: Children form simpler concepts; adults form abstract ones.
• Intelligence: Higher intelligence supports faster and more accurate concept
formation.
• Experience: More exposure leads to stronger concepts.
• Culture: Cultural background shapes the kinds of concepts we form.
• Language: Rich vocabulary enhances concept formation.
Final Thoughts
Concept formation is the mental process of organizing experiences into meaningful
categories. It involves perception, attention, abstraction, generalization, discrimination, trial
and error, language, and experience.
It is the foundation of learning, communication, and reasoning. Without concept formation,
we could not understand the world or interact meaningfully with others.
7. Explain the concept of correlaon. Describe the dierent types of correlaon along with
characteriscs.
Ans: What is Correlation?
Correlation is a statistical tool used to measure and describe the degree of relationship
between two or more variables. In simple language, correlation tells us:
• Whether two variables move together
• Whether they move in opposite directions
• Or whether they are completely unrelated
For example:
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• If height increases, weight also tends to increase → They have positive correlation.
• If the price of a product increases, its demand usually decreases → They have
negative correlation.
• Shoe size and intelligence have no correlation because they do not affect each
other.
So, correlation does not tell us cause and effect. It only tells us how strongly variables are
connected.
Why is Correlation Important?
Correlation is widely used in economics, business, social sciences, psychology, and research.
It helps in:
• Making predictions
• Understanding relationships
• Decision-making
• Planning policies
For example, doctors study the correlation between smoking and lung diseases. Economists
study the correlation between income and expenditure. Students study correlation to
understand marks and study hours.
Types of Correlation
Correlation can be classified in many ways. Let us understand them one by one in a simple
and interesting manner.
Positive Correlation
Positive correlation means that both variables move in the same direction. When one
increases, the other also increases. When one decreases, the other also decreases.
Examples:
• The more you study, the higher your marks.
• Increase in income leads to increase in expenditure.
• Increase in rainfall increases crop production.
Characteristics of Positive Correlation:
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• Both variables change in the same direction.
• Scatter plot points move upward together.
• Correlation coefficient is greater than 0 (between 0 and +1).
If correlation is strong, values are close to +1.
If weak, they are near 0.
Negative Correlation
Negative correlation means that variables move in opposite directions. When one
increases, the other decreases.
Examples:
• Increase in price leads to decrease in demand.
• More exercise results in less body fat.
• Increase in speed decreases travel time.
Characteristics of Negative Correlation:
• Variables move in opposite directions.
• Scatter plot slopes downward.
• Correlation coefficient lies between 0 and –1.
Strong negative correlation → values close to –1
Weak → values near 0.
Zero (No) Correlation
Sometimes, two variables have no relationship at all. Changes in one variable do not affect
the other.
Examples:
• Shoe size and intelligence
• Hair length and exam marks
• Mobile brand and height of a person
Characteristics of Zero Correlation:
• No particular pattern in data.
• Scatter plot appears random.
• Correlation coefficient is 0.
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This means both variables are independent.
Classification Based on Degree of Correlation
Correlation may not always be perfect. So, we also classify it based on strength.
Perfect Correlation
When two variables move exactly together in a fixed proportion, correlation is perfect.
Types:
• Perfect Positive Correlation (+1)
Example: If income doubles and expenditure also doubles.
• Perfect Negative Correlation (–1)
Example: If increase in price always results in exact proportional fall in demand.
Characteristics:
• Points lie on a straight line.
• Relationship is 100% predictable.
• Rare in real life.
High and Low Correlation
Sometimes, correlation exists but not perfectly.
High Correlation
Variables are closely related but not perfectly.
Example:
• Height and weight
• Study hours and marks (in most cases)
Low Correlation
Relationship exists but weak.
Example:
• Playing games and academic performance
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• Age and happiness
Classification Based on Nature of Relationship
Linear Correlation
If the change in one variable results in a proportionate change in another variable, the
correlation is linear.
Example:
• Increase in income leads to proportional increase in expenditure.
Characteristics:
• Forms a straight line.
• Easier to measure.
• Widely used in statistics.
Non-Linear (Curvilinear) Correlation
If variables change but not proportionately, the relationship is non-linear.
Example:
• At first, study time increases marks.
• After a limit, too much study causes stress and marks decrease.
So the relationship is curved.
Characteristics:
• Not constant.
• Forms a curve.
• Seen in natural and social phenomena.
How Do We Measure Correlation?
Although your question mainly asks concept and types, it’s helpful to know basic tools:
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• Karl Pearson’s Correlation Coefficient (measures linear correlation)
• Spearman’s Rank Correlation (used for ranked data)
• Scatter Diagram (graphical method)
These tools help convert relationships into meaningful numerical form.
Important Points to Remember
1. Correlation shows relationship, not cause and effect.
Example: Ice cream sales and drowning cases both increase in summer — they are
correlated but one does not cause the other.
2. Correlation ranges between –1 and +1.
3. Positive means same direction.
4. Negative means opposite direction.
5. Zero means no relation.
Conclusion
Correlation is a very important statistical concept that helps us understand how two
variables are related. Whether they move together, move oppositely, or have no relation,
correlation clearly explains this relationship. It is widely used in economics, statistics,
business, psychology, research, and everyday life.
By understanding types like positive, negative, zero, perfect, high, low, linear, and non-linear
correlation, students can easily analyze real-life situations and interpret data meaningfully.
8. What steps you will take to calculate coecient of correlaon (r) with the help of
Product Moment Method?
Ans: Coefficient of Correlation (r) and the Product Moment Method
Imagine you’re a teacher trying to understand whether students who study more hours
tend to score higher marks. You collect data: the number of hours studied and the marks
obtained. Now, you want to know—is there a relationship between study hours and exam
scores? This is where the coefficient of correlation (r) comes in.
Correlation tells us the strength and direction of the relationship between two variables.
The Product Moment Method, developed by Karl Pearson, is one of the most widely used
techniques to calculate this correlation.
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What is the Coefficient of Correlation?
The coefficient of correlation (denoted by r) is a statistical measure that shows:
• Direction of relationship: Positive (both increase together) or negative (one
increases while the other decreases).
• Strength of relationship: Ranges between -1 and +1.
Example:
• If r = +0.9, study hours and marks are strongly positively correlated.
• If r = -0.8, more hours of TV watching may strongly reduce exam scores.
• If r = 0, there is no relationship.
Product Moment Method
The Product Moment Method is also called Pearson’s correlation coefficient. It uses the
actual values of two variables (say X and Y) to calculate correlation.
The formula is:
Where:
• and are the two variables.
•
and
are their means.
• The numerator is the sum of the product of deviations.
• The denominator is the square root of the product of squared deviations.
In simple words: r = (covariance of X and Y) ÷ (product of their standard deviations).
Steps to Calculate r Using Product Moment Method
Let’s break it down step by step, with a relatable example.
Step 1: Collect Data
Gather paired values of two variables. Example: Study hours (X) and exam marks (Y) for
5 students.
Student
Study Hours (X)
Marks (Y)
A
2
40
B
4
50
C
6
60
D
8
70
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E
10
80
Step 2: Calculate Means
Find the average of X and Y.
For our data:
Step 3: Find Deviations
Subtract the mean from each value to get deviations.
Student
X
Y
A
2
40
-4
-20
B
4
50
-2
-10
C
6
60
0
0
D
8
70
+2
+10
E
10
80
+4
+20
Step 4: Multiply Deviations
Multiply each pair of deviations.
Student
Product
A
-4
-20
80
B
-2
-10
20
C
0
0
0
D
+2
+10
20
E
+4
+20
80
Step 5: Square Deviations
Square each deviation separately.
Student
A
16
400
B
4
100
C
0
0
D
4
100
E
16
400
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Step 6: Apply Formula
Now substitute values into the formula:
Step 7: Interpret Result
Here, r = 1, which means there is a perfect positive correlation between study hours and
marks. As study hours increase, marks increase proportionally.
A Relatable Story
Think of two friends, Riya and Arjun. Riya studies diligently every day, while Arjun studies
irregularly. Their teacher collects data and calculates r using the Product Moment Method.
She finds r = 0.85. This means there is a strong positive correlation: more study hours
generally lead to higher marks, though not perfectly.
This helps the teacher advise students: consistent study time is strongly linked to better
performance.
Advantages of Product Moment Method
• Simple and widely used.
• Uses actual values, not ranks.
• Measures both strength and direction of correlation.
• Applicable to many fields: education, psychology, economics, biology.
Limitations
• Sensitive to extreme values (outliers).
• Assumes a linear relationship.
• Cannot capture complex, non-linear correlations.
Example: The relationship between stress and performance may be curvilinear
(moderate stress improves performance, too much reduces it), which r cannot fully explain.
Final Thoughts
The coefficient of correlation (r) is a powerful tool to understand relationships between
variables. Using the Product Moment Method, we:
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1. Collect data.
2. Calculate means.
3. Find deviations.
4. Multiply deviations.
5. Square deviations.
6. Apply the formula.
7. Interpret the result.
This step-by-step process transforms raw numbers into meaningful insights about how
variables are connected.
“This paper has been carefully prepared for educaonal purposes. If you noce any
mistakes or have suggesons, feel free to share your feedback.”
