Question # 1

When brakes are applied to a fast moving car, the passenger will be thrown:

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Forward

Backward

Downward

none of these

A monkey sits on the pan of spring scale kept in an elevator. The reading of the spring scale will be maximum when

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Elevator is stationary

Elevator cable breaks and it falls freely towards earth

Elevator accelerates downwards

Elevator accelerates upward

According to the law of conservation of linear momentum, the total linear momentum of an isolated system

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increases

decreases with time

remains constant

none of them

In the above figures, tell which set is graphs shows that a body is moving uniform velocity:

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(i) and (ii)

(ii) and (iii)

(i) and (iii)

(ii) and (iv)

The entity which measures the quantity of motion in a body is called

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force

energy

momentum

power

The horizontal component of a projectile moving with initial velocity of 500 ms^-1at an angle 60° to x-axis is

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500 ms^-1

1000 ms^-1

250 ms^-1

Zero

A dirty carpet is to be cleaned by heating. This is in according with______law of motion.

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First

Second

Third

None of these

If the water falls from a dam into a turbine wheel 19.6 m below, then the velocity of water at the turbine, is (Take g=9.8 m/s²)

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9.8 m/s

19.6 m/s

39.2 m/s

98.0 m/s

Acceleration of a body is negative if the velocity of the body is

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constant

increasing

decreasing

none of them

Acceleration of a body is positive, if the velocity of the body is

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constant

increasing

decreasing

none of them

A ball of mass m moving with uniform speed collides elastically with another stationary ball. The incident ball will lose maximum kinetic energy when mass of the stationary ball is

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m

2 m

4 m

Infinity

Which of the following statements for an object in equilibrium is not true?

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The object must be at rest

The object can be at rest

The object is moving at constant speed

The acceleration of the object is zero

In the expression F x t, the force F is

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total force

instantaneous force

average force

all of them

A body is moving with constant velocity of 10 m/sec in the north-east direction. Then its acceleration will be:

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10 m/sec²

20 m/sec²

30 m/sec²

Zero

Change in momentum is one second called.

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Impulse

Force

Energy

Work

Which quantity has the same dimension as that of impulse?

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KE

Power

Momentum

Work

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

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