24th Dec Motion in Two & Three Dimensions Quiz 2 – Punjab Meritorious School Preparation Portal

Welcome to your 24th Dec Motion in one Two & Three Dimension Quiz 2 CBT TEST

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A particle having a mass 0.5 kg is projected under gravity with a speed of 98 m/s at an angle of 60°. The magnitude of the change in momentum in kg m/s of the particle after 10 s is

490

0.5

12 s

15 s

10 s.

Two persons are holding a rope of negligible weight tightly at its ends, so that it is horizontal. A 15 kg weight is attached to the rope at the mid-point, which is now no longer horizontal. The minimum tension required to completely straighten the rope is

15 kg

75 kg

30 kg

infinitely large.

A hunter at a monkey sitting on a tree at a considerable distance. At the instant he fires at it, the monkey drops. Will the bullet hit the monkey?

yes

sometimes

never.

The height y and the distance x along the horizontal plane of a projectile on a certain planet (with no surrounding atmosphere) are given by y= (8t -5t²) metre and x = 6t metre where t is in seconds. The velocity of projection is

8 m/sec

6 m/sec

10 m/sec

not obtained from the data.

A sphere of mass m, moving with a speed v strikes a wall elastically at an angle of incidence ϴ. If the speed of the sphere before and after collision is the same and the angle of rebound is equal to the angle of incidence and velocity normally towards the wall is taken as negative, then the change in momentum parallel to the wall is:

2 m v cos ϴ

-2 m v cos ϴ

zero

m v cos ϴ

A fielder in a cricket match throws a ball from the boundary line to the wicket keeper. The ball describes a parabolic path. Which of the following quantities remains constant during the ball's motion in air? (neglect air resistance)

its kinetic energy

its speed

the horizontal component of its velocity

the vertical component of its velocity.

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