Question # 1

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

The decrease in velocity per unit time is called:

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Variable Acceleration

Average Acceleration

Retardation

None of these

A man sitting in a bus travelling in a direction from west to east with a speed of 40 km/h observes that the rain drops are falling vertically down. To the another man standing on ground the rain will appear

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To fall vertically down

To fall at an angle going from west to east

To fall at an angle going from east to west

The information given is insufficient to decide the direction of rain

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

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Forward

Backward

Downward

none of these

What will be the ratio of the distance moved by a freely falling body from rest in 4th and 5th seconds of journey?

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4 : 5

7 : 9

16 : 25

1 : 1

A body of mass 5 kg is acted upon by a constant force of 20 n for 7 seconds. The total change in momentum will be:

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10 NS

100 NS

140 NS

200 NS

A train of 150 m length is going towards north direction at a speed of 10 ms^-1. A parrot files at a speed of 5 ms^-1towards south direction parallel to the railway track. The time taken by the parrot to cross the train is equal to

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12 s

8 s

15 s

10 s

The second law gives the relationship between

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mass and velocity

force and acceleration

velocity and acceleration

mass and weight

Work done along a closed path in a gravitational field is:

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Maximum

Minimum

Zero

Unity

Acceleration of a body at any particular instant during its motion is known as

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average acceleration

uniform acceleration

instantaneous acceleration

all of them

A train cover 90 km in half an hour. the time taken by it to travel 15 km will be:

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20 minutes

48 minutes

10 minutes

5 minutes

A change in position of a body from its initial position to its final position is known as

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relative motion

displacement

distance

acceleration

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

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Decreases

Increases

Remains constant

None of these

A lift is descending at a constant speed V. A passenger in the lift drops a coin. The acceleration of the coin towards the floor will be

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Zero

g

-g

V + g

Newton's first law is also called:

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Law of torque

Law of force

Law of inertia

None of these

If the acceleration of a body is negative, then slope of the velocity-time graph will be:

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Zero

Positive

Negative

Infinity

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