Which phenomenon occurs when sound waves bend around obstacles?

The correct answer is C: Diffraction. Diffraction is the bending of waves around obstacles or through openings. This explains why we can hear sounds around corners.

A spring with spring constant k = 100 N/m is compressed by 0.2 m. What is the elastic potential energy stored?

The correct answer is B: 2 J. Elastic potential energy U = ½kx². U = ½ × 100 × (0.2)² = 50 × 0.04 = 2 J.

A copper wire is stretched elastically. Which property is NOT affected?

The correct answer is A: Young's modulus. Young's modulus is a material property independent of the wire's dimensions or elastic deformation state. It depends only on the material composition and atomic structure, not on physical changes.

Atomic number of Carbon?

The correct answer is A: 6. Carbon atomic number = 6.

A transformer has 500 turns in primary and 100 turns in secondary coil. If primary voltage is 220V, what is the secondary voltage?

The correct answer is A: 44 V. Using transformer equation Vs/Vp = Ns/Np, we get Vs = 220 × (100/500) = 44 V

Central Govt Exam Preparation — SSC, UPSC, Bank, Railway

Central Exam — General Science — Physics

UPSC · SSC · Bank · Railway · NDA — Central Government Exam MCQ Practice

106 Questions 10 Topics Take Test

Showing 1–10 of 106 questions in Physics

Q.1 Medium Physics

The escape velocity from the surface of a planet depends on which two fundamental properties of that planet?

A Radius and temperature

B Mass and radius

C Density and temperature

D Atmospheric pressure and mass

Correct Answer: B. Mass and radius

Explanation:

Escape velocity is mathematically derived as v = √(2GM/R), where G is gravitational constant, M is the planet's mass, and R is its radius.

These two properties directly determine the gravitational field strength at the planet's surface, which defines the minimum velocity needed to escape gravitational attraction.

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Q.2 Easy Physics

Newton first law also called?

A Law of acceleration

B Law of gravitation

C Law of inertia

D Law of reaction

Correct Answer: C. Law of inertia

Explanation:

First law = Law of Inertia.

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Q.3 Easy Physics

Unit of electric current?

A Volt

B Ohm

C Ampere

D Watt

Correct Answer: C. Ampere

Explanation:

Current measured in Amperes.

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Q.4 Medium Physics

Speed of sound in air?

A 300 m/s

B 343 m/s

C 400 m/s

D 250 m/s

Correct Answer: B. 343 m/s

Explanation:

~343 m/s at 20°C.

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Q.5 Easy Physics

Ohm Law: V = ?

A I/R

B IR

C I+R

D I-R

Correct Answer: B. IR

Explanation:

V = I × R (Ohm Law).

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Q.6 Easy Physics

Sound cannot travel through?

A Water

B Steel

C Vacuum

D Air

Correct Answer: C. Vacuum

Explanation:

Sound needs medium, not vacuum.

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Q.7 Easy Physics

A body is thrown vertically upward with a velocity of 40 m/s. What is the maximum height reached? (Take g = 10 m/s²)

A 80 m

B 40 m

C 160 m

D 120 m

Correct Answer: A. 80 m

Explanation:

Using v² = u² - 2gh, where final velocity v = 0, u = 40 m/s, g = 10 m/s². We get h = 1600/20 = 80 m

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Q.8 Easy Physics

Which of the following is NOT a SI base unit?

A Ampere

B Kelvin

C Newton

D Mole

Correct Answer: C. Newton

Explanation:

Newton is a derived unit (kg⋅m⋅s⁻²). Ampere, Kelvin, and Mole are SI base units

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Q.9 Easy Physics

A car moving at 20 m/s suddenly applies brakes with deceleration of 5 m/s². How far does it travel before stopping?

A 20 m

B 40 m

C 60 m

D 80 m

Correct Answer: B. 40 m

Explanation:

Using v² = u² + 2as, where v = 0, u = 20 m/s, a = -5 m/s². We get s = 400/10 = 40 m

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Q.10 Easy Physics

What is the SI unit of pressure?

A Bar

B Pascal

C Atm

D Torr

Correct Answer: B. Pascal

Explanation:

Pascal (Pa) is the SI unit of pressure, equal to 1 N/m²

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