Ctet Science Questions with Detailed Solutions

Get Ctet Science Questions to prepare for your upcoming exam. Solve the most expected questions and detailed solutions that can be asked in the exam.

Important Ctet Science Questions

Q1.

Which of the following cannot be regarded as a “testable question”?
  • A.How does flu affect the human immune system?
  • B.When will fossil fuels run out?✓ Correct
  • C.What does an earthworm eat?
  • D.What is the effect of cigarette smoke on lungs?

Answer & Solution

Correct option is B


Correct Answer: (b)
Explanation: Scientific questions must be experimentally verifiable. The exact time when fossil fuels will be exhausted cannot be tested directly. All other options can be studied using experiments or observations.
Q2.

Which of the following does not satisfy “process validity” of science curriculum as recommended by NCF 2005?
  • A.Students discussing outcomes of connecting rubber, hairpin and LED in a circuit
  • B.Students forming hypotheses about seed germination in dry and moist cotton
  • C.Students making a list of elements from the periodic table✓ Correct
  • D.Students investigating acidity of household substances

Answer & Solution

Correct option is C


Correct Answer: (c)
Explanation: Process validity emphasizes inquiry, experimentation and thinking. Simply listing elements is rote learning, not a scientific process. The other options involve investigation and reasoning.
Q3.

A teacher arranged a fun trip to Qutub Minar for her learners. The learners observed the iron pillar which is about 1600 years old and rust-resistant. They were asked to list iron objects in their houses that rust and think about causes of rusting and ways to prevent it.
Which process skills are being developed?
  • A.Classification, observation, measurement
  • B.Inference, classification, observation
  • C.Classification, observation, hypothesis✓ Correct
  • D.Measurement, classification, inference

Answer & Solution

Correct option is C


Correct Answer: (c)
Explanation: Students:
• Observe the pillar and iron objects • Classify rusting vs non-rusting items • Form ideas about causes (hypothesis)
So the skills are classification, observation and hypothesis.
Q4.
Which of the following is the most appropriate strategy to introduce physical properties of metals and non-metals to Grade VII learners using an inquiry-based approach?
  • A.Initiate a discussion on students’ everyday experiences of using metallic and non-metallic substances
  • B.Define terms like sonorous, boiling point and melting point
  • C.Provide materials and ask students to deduce properties themselves✓ Correct
  • D.Write differences on the blackboard

Answer & Solution

Correct option is C


Correct Answer: (c)
Explanation: Inquiry-based learning emphasizes observation, experimentation, and reasoning. Allowing students to explore materials directly helps them discover properties on their own.
Additional Information: • Option a) is introductory but not inquiry-based • Option b) is teacher-centered • Option d) promotes rote learning
Q5.
Which of the following tasks would not contribute to developing scientific temper among students?
  • A.Emphasizing the historical aspects of the development of scientific concepts
  • B.Reading out the tenets of nature of science✓ Correct
  • C.Encouraging the students to ask questions
  • D.Providing hands-on experiences to students

Answer & Solution

Correct option is B


Correct Answer: (b)
Explanation: Scientific temper develops through inquiry, questioning, experimentation, and real-life engagement. Merely reading theoretical principles does not actively build scientific thinking.
Additional Information: • Option a) builds understanding of scientific progress • Option c) promotes curiosity • Option d) strengthens learning by experience
Q6.

Science textbooks often include stories like the discovery of silk in China and its spread through the Silk Route.
Which learning objectives are fulfilled?
A. Understanding nature of science B. Developing historical perspective C. Understanding science as socially and culturally embedded D. Reducing content burden by fun stories
Choose the correct option:
  • A.B, C and D
  • B.A, B and C✓ Correct
  • C.A, B and D
  • D.A, C and D

Answer & Solution

Correct option is B


Correct Answer: (b)
Explanation: Such stories:
Show how science develops (nature of science) Provide historical background
Show cultural and social influence
They are not meant just for entertainment.
So the correct set is A, B and C.
Q7.
Fill in the blanks:
At puberty, ovaries in females A and produce B. In males, C is produced by testes. These hormones are controlled by D.
  • A.A–enlarges; B–thyroxine; C–testosterone; D–thyroid gland
  • B.A–reduces; B–estrogen; C–testosterone; D–pituitary gland
  • C.A–enlarges; B–estrogen; C–testosterone; D–pituitary gland✓ Correct
  • D.A–reduces; B–estrogen; C–sex hormone; D–adrenal gland

Answer & Solution

Correct option is C


Correct Answer: (c)
Explanation: At puberty, ovaries enlarge and secrete estrogen, testes produce testosterone, and hormone secretion is regulated by the pituitary gland.
Q8.
Identify A, B, C and D in the following table:
Name of the salt
Salt obtained from (Acid)
Salt obtained from (Base)
Ammonium chloride
 HCl
 A
Sodium nitrate
 HNO₃
 B
Sodium chloride
 C
 D
Choose the correct option:
  • A.A – NH₄OH, B – NaOH, C – HCl, D – NaOH✓ Correct
  • B.A – NH₃, B – NaOH, C – HCl, D – NaOH
  • C.A – NH₄OH, B – NaO, C – HCl, D – NaHCO₃
  • D.A – NH₄OH, B – Na(OH)₂, C – HClO₂, D – NaH

Answer & Solution

Correct option is A


Correct Answer: (a)
Explanation: • Ammonium chloride is formed by the reaction of hydrochloric acid (HCl) with ammonium hydroxide (NH₄OH). • Sodium nitrate is produced by nitric acid (HNO₃) reacting with sodium hydroxide (NaOH). • Sodium chloride is formed from hydrochloric acid (HCl) and sodium hydroxide (NaOH).
Thus: A = NH₄OH B = NaOH C = HCl D = NaOH
Additional Information: • Salts are formed by neutralization reactions between acids and bases. • Strong acid + strong base generally form neutral salts like NaCl.
Q9.
Three identical bulbs are connected in different arrangements. In which will they glow the brightest?
  • A.All in parallel✓ Correct
  • B.Two in parallel in series with third
  • C.Two in series in parallel with third
  • D.All in series

Answer & Solution

Correct option is A


Correct Answer: (a)
Explanation: In parallel connection, each bulb receives full voltage of the source, so each glows with maximum brightness.
Additional Information: • Series reduces voltage across bulbs • Parallel maintains equal potential difference
Q10.
Read the statements and choose the correct option:
S ₁: Systematic experimentation should be introduced at upper primary level. S ₂: Activities and experimental evidence help in understanding science. S ₃: Most concepts should be developed using an inductive approach at upper primary level.
  • A.Both S ₁ and S ₃ are true and S ₃ is the correct reason for S ₁
  • B.Both S ₂ and S ₃ are true but S ₁ is false✓ Correct
  • C.Both S₁ and S ₃ are true but S ₂ is false
  • D.Both S ₁ and S ₂ are true and S ₂ is the correct reason for S ₁

Answer & Solution

Correct option is B


Correct Answer: (b)
Explanation:
At the upper primary level, students should mainly learn through activities and inductive reasoning rather than formal systematic experimentation.
Systematic experimentation is more suitable for secondary stages. However, activities and evidence-based learning are appropriate and effective at this level.
Additional Information:
• S ₂ is correct because hands-on activities help understanding • S ₃ is correct because inductive learning suits young learners • S ₁ is incorrect as structured experimentation is introduced later
Q11.
Why do silver articles turn black when kept in the open for a few days?
  • A.Due to reaction with hydrogen sulphide present in air✓ Correct
  • B.Due to reaction with nitrogen oxides present in air
  • C.Due to reaction with carbon monoxide present in air
  • D.Due to reaction with oxygen in air

Answer & Solution

Correct option is A


Correct Answer: (a)
Explanation: Silver reacts with hydrogen sulphide gas present in air to form silver sulphide (Ag₂S), which is black in colour. This causes tarnishing of silver articles.
Additional Information: • This black coating is not rust but a chemical compound called silver sulphide. • Moist air accelerates the tarnishing process.
Q12.
Read the following statements:
Assertion {A): Anodizing is a method to prevent metal from corrosion.
Reason {R): Anodizing is a process of coating iron with a layer of zinc.
Choose the correct option:
  • A.Both A and R are true but R is not the correct reason for A
  • B.A is true but R is false✓ Correct
  • C.Both A and R are false
  • D.Both A and R are true and R is the correct reason for A

Answer & Solution

Correct option is B


Correct Answer: (b)
Explanation: Anodizing is a protective process mainly used for aluminium in which a thick oxide layer is formed on the surface to prevent corrosion.
The reason statement is incorrect because coating iron with zinc is called galvanization, not anodizing.
Additional Information: • Anodizing increases corrosion resistance and surface hardness of metals like aluminium. • Galvanization protects iron by forming a zinc coating that prevents rusting.
Q13.

An ion of an element has two positive charges. The mass number is 27 and number of neutrons is 14. What is the number of electrons in the ion?

  • A.

    10

  • B.

    11

    ✓ Correct
  • C.

    15

  • D.

    13

Answer & Solution

Correct option is B

Correct Answer: (b)
Explanation: Mass number = Protons + Neutrons
27 = Protons + 14 Protons = 13
Neutral atom electrons = 13
Since ion has 2+ charge, it has lost 2 electrons:
Electrons = 13 − 2 = 11

Q14.
A ray of light travels from air into three media A, B and C. Identify X, Y, Z and W.
Transition
Speed
Frequency
Wavelength
Air → A
 X
 Y
 Decreases
Air → B
 Increases
 No change
 Z
Air → C
 Remains same
 W
 No change
Correct option:
  • A.X – Increases, Y – Increases, Z – Increases, W – Increases
  • B.X – Decreases, Y – Remains unchanged, Z – Increases, W – Remains unchanged✓ Correct
  • C.X – Decreases, Y – Increases, Z – Remains unchanged, W – Remains unchanged
  • D.X – Increases, Y – Decreases, Z – Decreases, W – Increases

Answer & Solution

Correct option is B


Correct Answer: (b)
Explanation: • When light enters denser medium → speed decreases, frequency remains constant, wavelength decreases • When speed increases → wavelength increases • If speed unchanged → frequency unchanged
Hence: X = Decreases Y = Remains same Z = Increases W = Remains unchanged
Q15.
Read the following statements:
Step 1: A few spoons of sugar are dissolved in water to prepare a concentrated sugar syrup. Step 2: The sugar syrup is heated on low flame till it caramelizes.
Choose the correct option:
  • A.Step 1 is a chemical change and Step 2 is a physical change
  • B.Both Step 1 and Step 2 are physical changes
  • C.Both Step 1 and Step 2 are chemical changes
  • D.Step 1 is a physical change and Step 2 is a chemical change
    ✓ Correct

Answer & Solution

Correct option is D


Correct Answer: (d)
Explanation: In Step 1, sugar dissolves in water without forming a new substance — this is a physical change.
In Step 2, heating causes sugar to caramelize, forming new substances with different color and taste — this is a chemical change.
Additional Information: • Physical changes do not create new substances. • Chemical changes result in new substances with new properties.

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