[Set-1] Physics MCQ for Competitive Exams

Physics MCQs for competitive exams, class 9 and Class 10

Instruction: Click or hover the mouse button on the black box to view answer of the MCQs. For mobile users, just touch on the black box.

[MCQ-1] The layer of the atmosphere which control earth’s normal temperature is

A: Troposphere
B: Stratosphere
C: Mesosphere
D: Exosphere

Answer – Tropsphere

MCQ-2 When a water bubble comes up from the depth of a pond its volume

A: Increase
B: Decrease
C: first increase and then decrease
D: first decrease and then increase

Answer – Increase

MCQ-3 Vapour density of a diatomic gas is 14. Atomic weight of the gas is

A: 14
B: 28
C: 42
D: 7

Answer- 28

MCQ-4 Two iron rods of length 1m and 2m respectively when heated to a certain temperature the ratio of linear expansion of those two rods will be

A: 1:2
B: 1:4
C: 1:8
D: 2:1

Answer – 1:2

MCQ-5 The deviation of light ray when refracted by a parallel glass slab is

A: 90 ^o
B: 0^o
C: 45^o
D: 180^o

Answer – 0^o

MCQ-6 The frequency of DC is

A: 0 Hz
B: 50 Hz
C: 60 Hz
D: 220 Hz

Answer – 0 Hz

MCQ-7 β ray is represented by

A: ⁴He₂²⁺
B: ₀e^-1
C: p⁺¹
D: n⁰

Answer – ₀e^-1

MCQ-8 How gave the idea of modern periodic table?

A: Bohr
B: Mendeleev
C: Lothar Meyer
D: Moseley

Answer – Moseley

MCQ-9 Which of the following conducts electricity?

A: CaO
B: CH₄
C: C₂H₂
D: C₂H₄

Answer – CaO

MCQ-10 A Convex lens of focal length 10 cm. An object is kept 20 cm apart from the lens. The linear magnification of the image will be

A: 10
B: 20
C: 1
D: 2

Answer: 1