Forces and Motion | Physics Mdcat | Practice Mcqs | mosaicbro.com
Forces and Motion | Physics Mdcat | Practice Mcqs
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Review Answers:
22
A bullet is shot from a rifle. As a result, the rifle recoils. The momentum of rifle as compared to that of the bullet is?
Correct Answer:C
Explanation:
By conservation of momentum, the momentum of the rifle is equal in magnitude but opposite in direction to that of the bullet.
23
A force of 100 N acts on a body of mass 10 Kg such that its velocity changes from V₁ to V₂ in 20 s then the rate of change of momentum will be equal to?
Correct Answer:A
Explanation:
The rate of change of momentum is equal to the applied force, which is 100 N.
24
S1 unit of impulse is same as of?
Correct Answer:C
Explanation:
Impulse is the change in momentum, and its SI unit is kg·m/s, same as momentum.
25
A body is projected with Kinetic Energy K at angle of 60° with the horizontal. Its Kinetic energy at the highest point of its trajectory will be?
Correct Answer:D
Explanation:
At the highest point, only the horizontal component of velocity remains, which is half the initial velocity. Thus, KE becomes K/4.
26
The speed of projectile at maximum height is half of its initial speed v then its angle of projection is?
Correct Answer:B
Explanation:
At maximum height, speed is vₓ = v₀ cosθ. Given vₓ = v₀/2, cosθ = 0.5 ⇒ θ = 60°.
27
Displacement of an object in moving around a complete circle is?
Correct Answer:C
Explanation:
Displacement is zero because the object returns to its starting point.
28
An object moves 20 m towards east and then 10 m towards west, in 5 sec. What is its average velocity and average speed?
Correct Answer:D
Explanation:
Total distance = 30 m ⇒ speed = 6 m/s. Displacement = 10 m east ⇒ velocity = 2 m/s east.