Answer Key: Part-2 (Mathematics)
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 ?
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 ?
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 ?
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 ?
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 :-
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
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 ?
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 ?
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 ?
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।
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 ?
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 ?
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 :
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-
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 ?
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 ?
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?
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 ?
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 ?
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 :-
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 ?
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 :
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 ?
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 ?
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 ?
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 ?
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 ?
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 ?
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
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
Correct Answer: (C)
Explanation: Without an atmosphere to trap heat or block direct solar radiation, days would be boiling hot and nights freezing cold.
PSTET II 2026: Mathematics & Science Answer Key (91-150)
Official Updates: PB.JOBSOFTODAY.IN
This answer key is prepared by subject experts and is UNOFFICIAL. It is for immediate reference only. Candidates should wait for the official PSTET answer key from PSEB for final confirmation.
Join Channel Now
Part-2: Mathematics (Questions 91-120)
| Q. No. | Correct Answer & Key Concept |
|---|---|
| 91 | (C) Non-terminating and non-recurring |
| 92 | (C) Circle (Points are concyclic) pb.jobsoftoday.in |
| 93 | (D) Square (Distance Formula: All sides = √34) |
| 94 | (C) LCM of k and m pb.jobsoftoday.in |
| 95-100 | 95: (B) 36 minutes | 96: (B) 20, 28 | 97: (A) 2 diagonals | 98: (B) Galileo | 99: (C) Rubric | 100: (C) Srinivasa Ramanujan |
| 101-110 | 101: (C) Mathematical fractals | 102: (A) Patterns and order | 103: (B) Proof | 104: (A) Concrete to Abstract | 105: (B) Napoleon | 106: (D) Enriching teachers (Not a problem) | 107: (C) One-fourth turn | 108: (A) 6174 | 109: (B) Visual representation | 110: (D) Triangular numbers |
| 111-120 | 111: (C) Rigveda | 112: (C) 3, 5 (Fibonacci) | 113: (B) Choice 'c' (Odd numbers) | 114: (D) 23/20 m | 115: (D) 10 + 8 × y | 116: (A) HCF × LCM = Product | 117: (B) 10,000 lakhs | 118: (A) p + q + r | 119: (B) 12:30 am | 120: (A) AAA condition pb.jobsoftoday.in |
Part-3: Science (Questions 121-150)
| Q. No. | Correct Answer & Explanation |
|---|---|
| 121 | (C) Solenoid field is NOT different from bar magnet (Incorrect stmt) |
| 122 | (D) Air / ਹਵਾ (Abiotic component) |
| 123 | (A) Switch is NOT the source of current (Incorrect stmt) |
| 124-130 | 124: (A) Assistive Tech | 125: (A) Split-ring commutator | 126: (B) Flexibility | 127: (C) Organizing concepts | 128: (D) Colorful covers | 129: (C) Project method | 130: (C) Identifying difficulties pb.jobsoftoday.in |
| 131-140 | 131: (B) Hands-on tasks | 132: (B) Inquiry & Experimentation | 133: (B) Temporary support (Scaffolding) | 134: (C) Students explore | 135: (B) Sequence (ii, i, iv, iii) | 136: (C) Nectar | 137: (C) (ii) and (iv) | 138: (D) (i, iii, iv) | 139: (D) Zinc granule | 140: (D) All statements are correct pb.jobsoftoday.in |
| 141-150 | 141: (A) Bos indicus & bubalis | 142: (C) Endemic & Exotic species | 143: (D) Response to stimuli | 144: (C) Relationships & Diversity | 145: (C) Related species group | 146: (C) Ozone and Oxygen | 147: (A) Replace (Not 3Rs) | 148: (C) Pressure change (Not pollution) | 149: (A) Charged | 150: (C) Increase during day, decrease during night pb.jobsoftoday.in |
Check how our Guess Paper matched Today's Exam!
Copyright © 2026 | PB.JOBSOFTODAY.IN
Dedicated to helping Punjab's future teachers succeed.
