PSTET MATHEMATICS - SCIENCE QUESTION PAPER 2026 ANSWER KEY
91. The decimal expansion of an irrational number is
(A) Terminating
(B) Non-terminating but recurring
(C) Non-terminating and non-recurring
(D) Terminating and recurring
Correct Answer: (C) Non-terminating and non-recurring
Description: By definition, the decimal expansion of an
irrational number goes on infinitely without forming a repeating pattern.
92. If a line segment joining two points subtends equal
angles at two other points lying on the same side of the line containing the
line segment, the four points lie on a
(A) Straight line
(B) Triangle
(C) Circle
(D) Parallelogram
Correct Answer: (C) Circle
Description: According to the standard circle theorem, if
points subtend equal angles in the same segment, they are concyclic (i.e., they
lie on the same circle).
93. Show that the points (1, 7), (4, 2), (–1, –1) and (–4,
4) are the vertices of a
(A) Rectangle
(B) Rhombus
(C) Parallelogram
(D) Square
Correct Answer: (D) Square
Description: Using the distance formula, all four side
lengths equal √34, and both diagonal lengths equal √68. A quadrilateral with
all equal sides and equal diagonals is a square.
94. If A is divisible by k and A is also divisible by m,
then A is divisible by the
(A) k + m
(B) k – m
(C) LCM of k and m
(D) HCF of k and m
Correct Answer: (C) LCM of k and m
Description: When a number is a common multiple of two
distinct numbers, it must also be a multiple of their Least Common Multiple
(LCM).
95. If Ram takes 1 hour to cut a given quantity of
vegetables and Shyam takes 1.5 hours to cut the same quantity, how much time
will they take to cut the vegetables if they work together ?
(A) 30 minutes
(B) 36 minutes
(C) 45 minutes
(D) 1 hour
Correct Answer: (B) 36 minutes
Description: Ram's rate is 1/60 per minute. Shyam's rate is
1/90 per minute. Combined rate = (1/60) + (1/90) = 5/180 = 1/36 per minute.
Therefore, it will take them 36 minutes together.
96. The ages of Hari and Harry are in the ratio 5:7. Four
years from now the ratio of their ages will be 3:4. Their present ages are :
(A) 25, 35
(B) 20, 28
(C) 15, 21
(D) 30, 42
Correct Answer: (B) 20, 28
Description: Let their ages be 5x and 7x. According to the
problem, (5x + 4) / (7x + 4) = 3 / 4. Solving this yields x = 4. Present ages
are 5(4) = 20 and 7(4) = 28.
97. How many diagonals does a convex quadrilateral have ?
(A) 2
(B) 1
(C) 0
(D) None of these
Correct Answer: (A) 2
Description: Any simple polygon with n sides has n(n-3)/2
diagonals. For a quadrilateral (n=4), the calculation is 4(1)/2 = 2.
98. Who said, 'Mathematics is the language with which the
God wrote the Universe' ?
(A) Isaac Newton
(B) Galileo
(C) Albert Einstein
(D) Pythagoras
Correct Answer: (B) Galileo
99. A set of guidelines for assessment which states the
characteristics and/or dimensions being assessed with clear performance
criteria and a rating scale ________
(A) Checklist
(B) Anecdotal record
(C) Rubric
(D) Observation schedule
Correct Answer: (C) Rubric
Description: A rubric is formally defined as an evaluation
tool that clearly lays out assessment criteria and performance scales.
100. Which Indian Mathematician of early 19th century
remarkably contributed to the theory of numbers, fractional differentiation,
hypergeometric series, elliptic functions, elliptic integrals ?
(A) Aryabhatta
(B) Bhaskaracharya
(C) Srinivasa Ramanujan
(D) Brahmagupta
Correct Answer: (C) Srinivasa Ramanujan
Description: Srinivasa Ramanujan is renowned worldwide for
his groundbreaking work in these highly specific mathematical domains. (Note:
The mention of "early 19th century" in the question text appears to
be an error by the examiner, as Ramanujan lived from 1887-1920).
101. The Sierpinski Carpet, Sierpinski Gasket and Koch
Snowflake are examples of ________
(A) Mathematical sequences
(B) Geometrical solids
(C) Mathematical fractals
(D) Algebraic curves
Correct Answer: (C) Mathematical fractals
Description: These are classic examples of mathematically
generated objects demonstrating infinite self-similarity at different scales,
known as fractals.
102. Mathematics is a study of ________ dealing with
numbers, geometrical objects, forms, algorithms, chance and change.
(A) Patterns and order
(B) Historical facts
(C) Language and literature
(D) Natural resources
Correct Answer: (A) Patterns and order
103. The method of establishing the truth of a preposition
is known as _________
(A) Verification
(B) Proof
(C) Assumption
(D) Observation
Correct Answer: (B) Proof
Description: In mathematics, a proof provides the logical
argument necessary to establish the objective truth of a proposition (spelled
"preposition" in the question paper).
104. While acquiring concepts, Mathematics curriculum must
explicitly incorporate the progression that the learner makes from _________
(A) concrete experiences to abstract thinking
(B) rote memorisation to procedural fluency
(C) informal reasoning to formal mathematical logic
(D) simple recall to complex problem-solving
Correct Answer: (A) concrete experiences to abstract
thinking
Description: Core constructivist pedagogy dictates that
learners must begin with tangible, concrete materials before they can
successfully bridge into abstract mathematical concepts.
105. Who said, "The progress and the improvement of
Mathematics are linked with the prosperity of the state" ?
(A) Carl Friedrich Gauss
(B) Napoleon Bonaparte
(C) Henri Poincaré
(D) Isaac Newton
Correct Answer: (B) Napoleon Bonaparte
106. Which of following is not a problem in teaching
learning of Mathematics ?
(A) A sense of fear and failure regarding Mathematics among
a majority of children
(B) A curriculum that disappoints both a talented minority
as well as the non-participating majority at the same time
(C) Crude methods of assessment that encourage perception of
mathematics as mechanical computation
(D) Enriching teachers with a variety of mathematical
resources
Correct Answer: (D) Enriching teachers with a variety of
mathematical resources
Description: Enriching teachers with resources is an
educational goal and a solution, whereas the other options describe active
problems and barriers in the classroom.
107. If a straight angle is formed by half of a full turn,
how much of a full turn will form a right angle ?
(A) One-half of a full turn.
(B) One-third of a full turn.
(C) One-fourth of a full turn.
(D) One-sixth of a full turn.
Correct Answer: (C) One-fourth of a full turn.
Description: A full turn equals 360°. A right angle is 90°.
90 is exactly one-fourth of 360.
108. Which of the following number is called the 'Kaprekar
constant' ?
(A) 6174
(B) 1089
(C) 1729
(D) 1001
Correct Answer: (A) 6174
Description: Named after the Indian mathematician D.R.
Kaprekar, 6174 is the constant achieved when taking any four-digit number (with
at least two distinct digits) and repeatedly subtracting the number's digits
arranged in ascending order from the digits arranged in descending order.
109. What is an infographic ?
(A) A long written explanation using only text
(B) A visual representation of information or data designed
to make complex ideas easy to understand
(C) A numerical table without images
(D) A detailed research article
Correct Answer: (B) A visual representation of information
or data designed to make complex ideas easy to understand
110. 1, 3, 6, 10, 15, ... are called _________
(A) cube numbers
(B) square numbers
(C) ordinary numbers
(D) triangular numbers
Correct Answer: (D) triangular numbers
Description: The sequence maps out numbers representing
equilateral triangles visually composed of dots (1, 1+2=3, 1+2+3=6, 1+2+3+4=10,
etc.).
111. Which ancient text speaks of a wheel with 360 spokes
(Verse 1.164.48) ?
(A) Arthashastra
(B) Aranyakas
(C) Rigveda
(D) Yajnavalkya Smriti
Correct Answer: (C) Rigveda
112. Find the missing number(s) in the following sequence:
1, 2, ___, ___, 8, 13, 21, 34, 55, 89
(A) 5, 7
(B) 4, 6
(C) 3, 5
(D) 2, 4
Correct Answer: (C) 3, 5
Description: This is the Fibonacci sequence, where every
number is the sum of the two preceding numbers (1+2=3, 2+3=5, 3+5=8).
113. Which algebraic expression is true ?
a. The expression 4m - 1 always gives odd numbers.
b. All even numbers can be expressed as 6j - 4.
c. Both expressions 2p + 1 and 2q - 1 describe all odd
numbers.
d. The expression 2f + 3 gives both even and odd numbers.
(A) b
(B) c
(C) d
(D) a
Correct Answer: (B) c
Description: In standard algebraic notation for integers,
odd numbers take the form of an even number plus or minus 1 (i.e., 2p+1 and
2q-1 covers the entire integer set of odd numbers).
114. Geeta bought 2/5 meter of lace and Shamim bought 3/4
meter of the same lace to put a complete border on a table cloth whose
perimeter is 1 meter long. Find the total length of the lace they both have
bought.
(A) 29/20 m
(B) 17/20 m
(C) 11/20 m
(D) 23/20 m
Correct Answer: (D) 23/20 m
Description: Calculating the sum of fractions: 2/5 + 3/4 =
(8/20) + (15/20) = 23/20 meters.
115. Venkatalakshmi owns a flour mill. It takes 10 seconds
for the roller mill to start running. Once it is running, each kg of grain
takes 8 seconds to grind into powder. Which of the expressions below describes
the time taken to complete grind 'y' kg of grain, assuming the machine is off
initially ?
(A) 10 + 8 + y
(B) (10 + 8) × y
(C) 10 × 8 × y
(D) 10 + 8 × y
Correct Answer: (D) 10 + 8 × y
Description: There is a fixed time overhead of 10 seconds to
start the machine, followed by a variable time of 8 seconds multiplied by the
'y' kgs of grain.
116. Which of the following statements is true for any two
positive integers ?
(A) HCF × LCM = Product of the two numbers
(B) HCF + LCM = Product of the two numbers
(C) HCF ÷ LCM = Product of the two numbers
(D) HCF - LCM = Product of the two numbers
Correct Answer: (A) HCF × LCM = Product of the two numbers
Description: This is a fundamental mathematical property
establishing the relationship between the Highest Common Factor and Least
Common Multiple of any two distinct positive integers.
117. How many lakhs make a billion ?
(A) 1,000 lakhs
(B) 10,000 lakhs
(C) 1,00,000 lakhs
(D) 100 lakhs
Correct Answer: (B) 10,000 lakhs
Description: 1 billion = 1,000,000,000. Since 1 lakh =
100,000, you divide 1,000,000,000 by 100,000, which gives 10,000 lakhs.
118. Pushpita sells two types of flowers on Independence
Day: champak and marigold. 'p' customers only bought champak, 'q' customers
only bought marigold, and 'r' customers bought both. On the same day, she gave
away a tiny national flag to every customer. How many flags did she give away
that day ?
(A) p + q + r
(B) p + q + 2r
(C) 2 × (p + q + r)
(D) p + q + r + 2
Correct Answer: (A) p + q + r
Description: Since she gives one flag to *every customer*
(regardless of what or how much they bought), the total number of unique
customers mathematically breaks down to p + q + r.
119. Safia saw the Moon setting on Monday at 10 pm. Her
mother, who is a scientist, told her that every day the Moon sets 5/6 hour
later than the previous day. How many hours after 10 pm will the Moon set on
Thursday ?
(A) 11:30 pm
(B) 12:30 am
(C) 01:30 am
(D) 10:30 pm
Correct Answer: (B) 12:30 am
Description: The difference between Monday and Thursday is 3
days. A 5/6 hour (50 minutes) delay per day × 3 days equals a total delay of
15/6 hours (or 2.5 hours). Setting exactly 2.5 hours after 10:00 pm lands on
12:30 am.
120. Which of the following is not a condition for
congruency of a triangle ?
(A) AAA condition
(B) SAS condition
(C) ASA condition
(D) AAS condition
Correct Answer: (A) AAA condition
Description: Angle-Angle-Angle (AAA) only proves similarity
between two triangles, not congruency, because the matching angles do not
guarantee the sides are the exact same length.
PSTET 2025: Science Answer Key (Q. 121-150)
121. For a current in a long straight solenoid N- and
S-poles are created at the two ends. Among the following statements, the
incorrect statement is :
ਜਦੋਂ ਕਰੰਟ ਕਿਸੇ
ਲੰਬੇ ਸੋਲਨੋਇਡ ਵਿਚੋਂ ਲੰਘਦਾ ਹੈ ਉਦੋਂ ਸੋਲਨੋਇਡ ਦੇ ਸਿਰਿਆਂ ਵਿਚ ਉੱਤਰੀ ਅਤੇ ਦੱਖਣੀ ਧਰੁਵ
ਪੈਦਾ ਹੁੰਦੇ ਹਨ। ਹੇਠ ਲਿਖਿਆਂ ਵਿਚੋਂ ਕਿਹੜਾ ਕਥਨ ਗਲਤ ਹੈ ?
(A) The field lines inside the solenoid are in the form of
straight lines which indicates that the magnetic field is the same at all
points inside the solenoid.
(B) The strong magnetic field produced inside the solenoid
can be used to magnetise a piece of magnetic material like soft iron, when
placed inside the coil.
(C) The pattern of the magnetic field associated with the
solenoid is different from the pattern of the magnetic field around a bar
magnet.
(D) The N- and S-poles exchange position when the direction
of current through the solenoid is reversed.
Correct Answer: (C)
Explanation: The magnetic field pattern of a solenoid is
actually very similar to that of a bar magnet, not different.
122. Biotic component of biosphere is not constituted by
ਹੇਠ ਲਿਖਿਆਂ ਵਿੱਚੋਂ
ਜੀਵ-ਮੰਡਲ ਵਿਚ ਜੈਵਿਕ ਅੰਗ ਕਿਸ ਤੋਂ ਗਠਿਤ ਨਹੀਂ ਹੁੰਦੇ ?
(A) producers
(B) consumers
(C) decomposers
(D) air
Correct Answer: (D)
Explanation: Air is an abiotic (non-living) component, while
producers, consumers, and decomposers are biotic (living).
123. Choose the incorrect statement:
ਹੇਠ ਲਿਖਿਆਂ ਵਿਚੋਂ
ਕਿਹੜਾ ਕਥਨ ਗਲਤ ਹੈ ?
(A) A switch is the source of electric current in a circuit.
(B) A switch helps to complete or break the circuit.
(C) A switch helps us to use electricity as per our
requirement.
(D) When the switch is open there is an air gap between its
terminals.
Correct Answer: (A)
Explanation: A switch controls the flow of current but is
not the source; a battery or generator is the source.
124. A school plans to improve inclusivity in science
teaching for children with disabilities. Which change in learning resources
will best support this initiative?
ਇਕ ਸਕੂਲ ਦਿਵਿਆਂਗ
ਬੱਚਿਆਂ ਲਈ ਵਿਗਿਆਨ ਸਿੱਖਿਆ ਵਿਚ ਸਮਾਵੇਸ਼ਤਾ ਨੂੰ ਸੁਧਾਰਨ ਦੀ ਯੋਜਨਾ ਬਣਾਉਂਦਾ ਹੈ। ਇਸ
ਪਹਿਲਕਦਮੀ ਲਈ ਸਿੱਖਿਆ ਦੇ ਸਰੋਤਾਂ ਵਿਚ ਸਭ ਤੋਂ ਸਹਾਇਕ ਬਦਲਾਅ ਕੀ ਹੋਵੇਗਾ ?
(A) Providing assistive technologies and adapted materials
(B) Increasing theoretical instruction
(C) Reducing practical activities
(D) Using only digital content
Correct Answer: (A)
Explanation: Assistive technology and adapted tools are
essential for making science accessible to students with different
disabilities.
125. To convert an AC generator into DC generator
AC ਜਨਰੇਟਰ ਨੂੰ DC
ਜਨਰੇਟਰ ਵਿਚ ਬਦਲਣ ਲਈ :-
(A) split-ring type commutator must be used.
(B) slip rings and brushes must be used.
(C) a stronger magnetic field has to be used.
(D) a rectangular wire loop has to be used.
Correct Answer: (A)
Explanation: A split-ring commutator reverses the connection
to the external circuit every half turn to produce direct current (DC).
126. Which Principle should guide the selection of learning
resources for teaching science to children with disabilities?
ਦਿਵਿਆਂਗ ਬੱਚਿਆਂ ਲਈ
ਸਿੱਖਣ ਦੇ ਸਰੋਤਾਂ ਦੀ ਚੋਣ ਵਾਸਤੇ ਹੇਠ ਲਿਖਿਆਂ ਵਿਚੋਂ ਕਿਹੜਾ ਸਿਧਾਂਤ ਮੁੱਖ ਰੂਪ ਵਿਚ ਮਾਰਗ
ਦਰਸ਼ਕ ਹੋਵੇਗਾ
(A) Uniformity for all learners
(B) Flexibility based on individual needs
(C) Preference for traditional methods
(D) Focus on assessment outcomes
Correct Answer: (B)
Explanation: Inclusivity requires flexibility to meet the
unique physical or cognitive needs of each individual learner.
127. Concept mapping is used for:
ਸੰਕਲਪ ਮੈਪਿੰਗ ਕਿਸ
ਵਾਸਤੇ ਵਰਤੀ ਜਾਂਦੀ ਹੈ ?
(A) Decorating classroom
(B) Drawing diagrams
(C) Organizing and relating concepts
(D) Copying from textbook
Correct Answer: (C)
Explanation: Concept maps are visual tools used to show
relationships between different ideas or pieces of information.
128. A good science book should have all except:
ਇੱਕ ਚੰਗੀ ਵਿਗਿਆਨ ਦੀ
ਕਿਤਾਬ ਵਿਚ ਹੇਠ ਲਿਖਿਆਂ ਵਿੱਚੋਂ ਕਿਸ ਨੂੰ ਛੱਡ ਕੇ ਸਭ ਕੁੱਝ ਹੋਣਾ ਚਾਹੀਦਾ ਹੈ ?
(A) Activities
(B) Scientific accuracy
(C) Clear diagrams
(D) Colorful covers
Correct Answer: (D)
Explanation: While a colorful cover is nice, it is not an
essential pedagogical requirement compared to accuracy and clear content.
129. Which of the following method encourages learning
through real life experience?
ਹੇਠ ਲਿਖਿਆਂ ਵਿੱਚੋਂ
ਕਿਹੜੀ ਵਿਧੀ ਜੀਵਨ ਦੇ ਤਜਰਬੇ ਰਾਹੀ ਸਿੱਖਣ ਨੂੰ ਉਤਸ਼ਾਹਿਤ ਕਰਦੀ ਹੈ ?
(A) Lecture method
(B) Demonstration method
(C) Project method
(D) Dictation method
Correct Answer: (C)
Explanation: The project method allows students to
investigate real-world problems and learn through hands-on experience.
130. Diagnostic evaluation in science teaching is meant to :
ਵਿਗਿਆਨ ਸਿੱਖਿਆ ਵਿਚ
ਡਾਇਗਨੋਸਟਿਕ ਮੁਲਾਂਕਣ ਤੋਂ ਭਾਵ ਹੈ।
(A) Assign grades
(B) Test memory
(C) Identifying learning difficulties
(D) Promote students to next class
Correct Answer: (C)
Explanation: Diagnostic evaluation is used specifically to
identify the root causes of a student’s struggle in learning a concept.
131. The best way to assess practical skills in science is
ਵਿਗਿਆਨ ਵਿਚ ਵਿਹਾਰਕ
ਹੁਨਰਾਂ ਦਾ ਮੁਲਾਂਕਣ ਕਰਨ ਲਈ ਸਭ ਤੋਂ ਵਧੀਆ ਤਰੀਕਾ ਕੀ ਹੈ ?
(A) Multiple choice questions
(B) Hands on performance tasks
(C) Written exams
(D) Oral quiz
Correct Answer: (B)
Explanation: Practical skills are best measured by watching
a student actually perform a task or experiment.
132. Science club in schools should focus on
ਸਕੂਲ ਵਿਚ ਵਿਗਿਆਨ
ਕਲੱਬ ਦਾ ਮੁੱਖ ਮੰਤਵ ਹੇਠ ਲਿਖਿਆਂ ਵਿਚੋਂ ਕੀ ਹੋਣਾ ਚਾਹੀਦਾ ਹੈ ?
(A) Solving test book questions only
(B) Encouraging scientific inquiry and experimentation
(C) Arranging tours only
(D) Hosting sports
Correct Answer: (B)
Explanation: Science clubs are meant to foster curiosity and
provide a space for exploration beyond the textbook.
133. The term 'Scaffolding' in pedagogy refers to:
ਸਿੱਖਿਆ ਸ਼ਾਸ਼ਤਰ ਵਿਚ
‘ਸਕੈਫੋਲਡਿੰਗ’ ਮਦ ਤੋਂ ਭਾਵ ਹੈ :
(A) Making questions difficult
(B) Providing temporary support to help learning
(C) Punishing students
(D) Assigning ranks
Correct Answer: (B)
Explanation: Scaffolding is temporary assistance provided by
a teacher or peer to help a student reach a higher level of understanding.
134. In enquiry based learning
ਪੁੱਛ-ਗਿਛ 'ਤੇ ਆਧਾਰਿਤ ਸਿਖਲਾਈ ਵਿਚ-
(A) Teacher gives all answers
(B) Students memorize
(C) Students explore and find answers
(D) Textbooks are the only source
Correct Answer: (C)
Explanation: In inquiry-based learning, the student is
active, asking questions and conducting research to find answers.
135. Given below are the steps to test the presence of
proteins in a food item. (i) Take a small quantity of the food item in a test
tube, add 10 drops of water to it and shake it. (ii) Make a paste or powder of
food to be tested. (iii) Add 10 drops of caustic soda solution to the test tube
and shake well. (iv) Add 2 drops of copper sulphate solution to it. Which of
the following is the correct sequence of the steps?
ਖਾਣ ਪੀਣ ਦੀਆਂ
ਵਸਤੂਆਂ ਵਿਚ ਪ੍ਰੋਟੀਨ ਦੀ ਮੌਜੂਦਗੀ ਦੀ ਜਾਂਚ ਕਰਨ ਲਈ ਵਰਤੇ ਜਾਣ ਵਾਲੇ ਕਦਮਾਂ ਨੂੰ ਹੇਠਾਂ
ਦਿੱਤਾ ਗਿਆ ਹੈ... ਇਹਨਾਂ ਕਦਮਾਂ ਦਾ ਸਹੀ ਕ੍ਰਮ ਹੇਠ ਲਿਖਿਆਂ ਵਿੱਚੋਂ ਕਿਹੜਾ ਹੈ ?
(A) (i), (ii), (iv), (iii)
(B) (ii), (i), (iv), (iii)
(C) (ii), (i), (iii), (iv)
(D) (iv), (ii), (i), (iii)
Correct Answer: (B)
Explanation: The correct sequence starts with preparing the
sample, adding water, then Copper Sulphate, and finally Caustic Soda.
136. From which of the following Honeybee makes honey?
ਹੇਠ ਲਿਖਿਆਂ ਵਿਚੋਂ
ਮਧੂਮੱਖੀ ਕਿੱਥੋਂ ਸ਼ਹਿਦ ਬਣਾਉਂਦੀ ਹੈ ?
(A) Pollen
(B) Petals
(C) Nectar
(D) Bud
Correct Answer: (C)
Explanation: Honeybees collect nectar (sweet liquid) from
flowers and process it into honey.
137. Read the following statements about disease : (i) They
are caused by germs. (ii) They are caused due to lack of nutrients in our diet.
(iii) They can be passed on to another person through contact. (iv) They can be
prevented by taking a balanced diet. Which pair of statements best describe a
deficiency disease?
ਰੋਗ ਬਾਰੇ ਦਿੱਤੇ
ਕਥਨਾਂ ਨੂੰ ਪੜ੍ਹੋ :-... ਕਿਹੜਾ ਜੋੜਾ ਕਮੀ ਵਾਲੀ ਬਿਮਾਰੀ (deficiency disease) ਦਾ ਸਹੀ ਵਰਣਨ ਕਰਦਾ ਹੈ?
(A) (i) and (ii)
(B) (ii) and (iii)
(C) (ii) and (iv)
(D) (i) and (iii)
Correct Answer: (C)
Explanation: Deficiency diseases are caused by a lack of
nutrients and can be prevented by a balanced diet.
138. Animal husbandry is the scientific management of (i)
animal breeding (ii) culture of animals (iii) animal livestock (iv) rearing of
animals
ਪਸ਼ੂ ਪਾਲਣ ਹੇਠ
ਲਿਖਿਆਂ ਵਿਚੋਂ ਕਿਹਨਾਂ ਦਾ ਵਿਗਿਆਨਕ ਪ੍ਰਬੰਧਨ ਹੈ ?
(A) (i), (ii) and (iii)
(B) (ii), (iii) and (iv)
(C) (i), (ii) and (iv)
(D) (i), (iii) and (iv)
Correct Answer: (D)
Explanation: Animal husbandry involves breeding, managing
livestock, and rearing animals for production.
139. The substance that will be flattened on beating with a
hammer is :
ਹਥੌੜੇ ਨਾਲ ਕੁੱਟਣ
ਨਾਲ ਹੇਠ ਲਿਖਿਆਂ ਵਿੱਚੋਂ ਕਿਹੜੀ ਵਸਤੂ ਸਮਤਲ ਹੋ ਜਾਵੇਗੀ ?
(A) Crystal of iodine
(B) Lump of sulphur
(C) Piece of coal
(D) Zinc granule
Correct Answer: (D)
Explanation: Zinc is a metal and possesses the property of
malleability (can be flattened into sheets). The others are brittle non-metals.
140. Find out the wrong statement from the following:
ਹੇਠ ਲਿਖਿਆਂ ਵਿਚੋਂ
ਗਲਤ ਕਥਨ ਨੂੰ ਲੱਭੋ :-
(A) White revolution is meant for increase in milk
production.
(B) Blue revolution is meant for increase in fish
production.
(C) Increasing food production without compromising with
environmental quality is called as sustainable agriculture.
(D) None of the above
Correct Answer: (D)
Explanation: All statements (A, B, and C) are scientifically
and factually correct.
141. Which of the following are Indian cattle ? (i) Bos
indicus (ii) Bos domestica (iii) Bos bubalis (iv) Bos vulgaris
ਹੇਠ ਲਿਖਿਆਂ ਵਿਚੋਂ
ਭਾਰਤੀ ਪਸ਼ੂ ਕਿਹੜੇ ਹਨ ?
(A) (i) and (iii)
(B) (i) and (ii)
(C) (ii) and (iii)
(D) (iii) and (iv)
Correct Answer: (A)
Explanation: Bos indicus is the Indian cow, and Bos bubalis
is the Indian buffalo.
142. Botanical gardens and zoological parks have :
ਬਨਸਪਤੀ ਵਿਗਿਆਨਕ
ਬਾਗ਼ ਅਤੇ ਜੀਵ ਜੰਤੂ ਪਾਰਕ ਵਿਚ ਹੁੰਦਾ ਹੈ :
(A) Collection of endemic living species only
(B) Collection of exotic living species only
(C) Collection of endemic and exotic living species
(D) Collection of only local plants and animals
Correct Answer: (C)
Explanation: These conservation centers keep both local
(endemic) and foreign (exotic) species for research and education.
143. Which of the following is a defining characteristic of
living organisms?
ਹੇਠ ਲਿਖਿਆਂ ਵਿਚੋਂ
ਜੀਵਤ ਜੀਵ ਜੰਤੂਆਂ ਦੀ ਪਰਿਭਾਸ਼ਿਕ ਵਿਸ਼ੇਸ਼ਤਾ ਕੀ ਹੈ ?
(A) Growth
(B) Ability to make sound
(C) Reproduction
(D) Response to external stimuli
Correct Answer: (D)
Explanation: Consciousness or response to stimuli is a
defining property. Growth and reproduction can sometimes have exceptions (like
sterile hybrids).
144. The term 'systematics' refers to:
ਹੇਠ ਲਿਖਿਆਂ ਵਿਚੋਂ
‘ਪ੍ਰਣਾਲੀਗਤ’ ਦਾ ਕੀ ਮਤਲਬ ਹੈ ?
(A) Identification and classification of plants and animals
(B) Nomenclature and identification of plants and animals
(C) Diversity of kinds of organisms and their relationship
(D) Study of habitats of organisms and their classification
Correct Answer: (C)
Explanation: Systematics is the study of the diversity of
life and the evolutionary relationships between organisms.
145. Genus represents:
ਜੀਨਸ ਕਿਸ ਦੀ
ਪ੍ਰਤੀਨਿਧਤਾ ਕਰਦਾ ਹੈ ?
(A) An individual plant or animal
(B) A collection of plants or animals
(C) Group of closely related species of plants or animals
(D) None of these
Correct Answer: (C)
Explanation: In taxonomy, a Genus is a rank above species
that groups together closely related species.
146. The two forms of oxygen found in the atmosphere are
ਵਾਯੂਮੰਡਲ ਵਿਚ
ਆਕਸੀਜਨ ਦੇ ਹੇਠ ਲਿਖਿਆਂ ਵਿਚੋਂ ਕਿਹੜੇ ਦੋ ਪ੍ਰਕਾਰ ਮਿਲਦੇ ਹਨ ?
(A) water and ozone
(B) water and oxygen
(C) ozone and oxygen
(D) water and carbon dioxide
Correct Answer: (C)
Explanation: The two elemental forms are diatomic oxygen
(O₂) and ozone (O₃).
147. Which of the following is not a way to conserve water?
ਪਾਣੀ ਦੀ ਸੰਭਾਲ
ਵਾਸਤੇ ਹੇਠ ਲਿਖਿਆਂ ਵਿਚੋਂ ਕਿਹੜਾ ਤਰੀਕਾ ਠੀਕ ਨਹੀਂ ਹੈ ?
(A) Replace
(B) Reduce
(C) Reuse
(D) Recycle
Correct Answer: (A)
Explanation: While Reduce, Reuse, and Recycle (3Rs) are
standard conservation methods, 'Replace' is not a standard term for water
conservation.
148. The term "water-pollution" can be defined in
several ways. Which of the following statements does not give the correct
definition?
ਹੇਠ ਲਿਖਿਆਂ ਵਿਚੋਂ
ਕਿਹੜੀ ਪਰਿਭਾਸ਼ਾ ਪਾਣੀ ਦੇ ਪ੍ਰਦੂਸ਼ਣ ਨੂੰ ਸਹੀ ਤਰ੍ਹਾਂ ਪਰਿਭਾਸ਼ਿਤ ਨਹੀਂ ਕਰਦੀ ?
(A) The addition of undesirable substances to water bodies
(B) The removal of desirable substances from water bodies
(C) A change in pressure of the water bodies
(D) A change in temperature of the water bodies
Correct Answer: (C)
Explanation: Pressure changes are usually
physical/mechanical and not defined as "pollution," whereas thermal
or chemical changes are.
149. An electroscope is a device which is used to find if an
object is
ਇਲੈਕਟ੍ਰੋਸਕੋਪ ਇਕ
ਐਸਾ ਯੰਤਰ ਹੈ ਜੋ ਉਸ ਵਸਤੂ ਨੂੰ ਲੱਭਣ ਲਈ ਵਰਤਿਆ ਜਾਂਦਾ ਹੈ ਜੋ ਕਿ
(A) charged
(B) magnetic
(C) free of cracks
(D) hot
Correct Answer: (A)
Explanation: An electroscope detects the presence and
magnitude of an electric charge on a body.
150. If there were no atmosphere around the earth, the
temperature of the earth will
ਜੇ ਧਰਤੀ ਦੇ ਆਲੇ
ਦੁਆਲੇ ਵਾਯੂਮੰਡਲ ਨਾ ਹੋਵੇ ਤਾਂ ਧਰਤੀ ਦਾ ਤਾਪਮਾਨ
(A) increase
(B) go on decreasing
(C) increase during day and decrease during night
(D) be unaffected
Correct Answer: (C)
Explanation: Without an atmosphere to trap heat or block
direct solar radiation, days would be boiling hot and nights freezing cold.