Physics MCQs for competitive exams, class 9 and Class 10
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[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: 0o
C: 45o
D: 180o
Answer – 0o
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