Physics MCQs for Class 9 with Answers
What is the effect of lubricicantion?
Increase friction
No effect
Reduce friction
None
Inertia depends upon:
Weight
Mass
Density
Force
Sliding friction can be changed into rolling friction by using:
Ball bearing
Roller bearing
Both a and b
None of these
Two bodies of masses m1 and m1 attached to the ends of an inextensible string passing over a frictionless pulley such that both move vertically. The acceleration of the bodies is:
m1 x m2 / m1 + m2 g
m1 – m2 / m1 + m2 g
m1 + m2 / m1 – m3 g
None of these
Action and Reaction are always on:
Same body
Different bodies
Any body
None of these
Which of the following relation is correct?
F = xa0m/a
F = m-a
F = ma
F = m + a
The force_________oppose the motion of a moving object is called:
Momentum
Friction
Power
Work
The static fraction between wood and lather is _______________
0.6
0.7
0.9
0.8
Kgms-2 is equal to:
Joule
Mole
Newton
Watt
The unit of coefficient of friction .
Newton
ms-1
ms-2
No unit
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