Question # 1

The range of projectile is 50 m whenθ is inclined with horizontal at 15°. What is the range whenθ becomes 45°?

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400 m

300 m

200 m

100 m

A the top of the trajectory of a projectile, the directions of its velocity and acceleration are

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Perpendicular to each other

Parallel to each other

Inclined to each other at an angle of 45°

Anitparallel to each other

Distance covered by a freely falling body in 2 sec will be

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4.9 m

19.6 m

29.2 m

44.1 m

A lift is moving up with acceleration equal to 1/5 of that due to gravity. The apparent weight of a 60 kg man standing in lift is

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60 kg wt

72 kg wt

48 kg wt

Zero

A car moves for half of its time at 80 km/h and rest half of time at 40 km/h, The total distance covered is 60 km. What is the average speed of the car?

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60 km/hr

80 km/hr

120 km/hr

180 km/hr

Change in momentum is one second called.

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Impulse

Force

Energy

Work

If the instantaneous velocity of a body does not change. the body is said to be moving with

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average velocity

uniform velocity

instantaneous velocity

variable velocity

The velocity of a body at any instant of its motion is known as

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average velocity

instantaneous velocity

uniform velocity

none of them

Rocket engines lift a rocket from the earth surface, because hot gas with high velocity

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Push against the air

React against the rocket and push it up

Heat up the air which lifts the rocket

Push against the earth

Which quantity has the same units as impulse

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force

work

linear momentum

acceleration

One newton is a force that produces an acceleration of 0.5 m/sec²in a body of mass:

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2 Kg

3 Kg

4 Kg

8 Kg

A body whose momentum is constant must have constant

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Acceleration

Velocity

Force

None of these

If the velocity time graph is a straight line parallel to the time-axis, then it means:

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The body is moving with uniform velocity

The body is moving with uniform acceleration

The body is at rest

None of these

The second law gives the relationship between

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mass and velocity

force and acceleration

velocity and acceleration

mass and weight

During the upward motion of the projectile, the vertical component of velocity:

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Decreases

Increases

Remains constant

None of these

What must be changing when a body is accelerating uniformly?

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the force acting on a body

the velocity of the body

the mass of the body

the speed of the body

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ECAT Physics Chapter 3 Motion and Force Online Test MCQs With Answers

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