Question # 1

A mass of 5kg moves with an acceleration of 10m s^-2force applied is

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10N

50N

2N

20N

The effect of applying a force on a moving body is to change

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its direction of motion only

its speed of motion only

both the direction and speed of motion

its inertia only

When a bicycle is in motion but not pedaled, the force of friction exerted by the ground on the two wheels is such that it acts

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In the backward direction on the front wheel and in the forward direction on the rear wheel

In the forwards directions on the front wheel and in the backward direction on the rear wheel

In the forward direction on both the wheels

In the backward direction on both the wheels

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

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

When a bicycle is in motion, the frictional forces exerted by the ground are

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In the forward direction on both the wheels

In the backward direction on both the wheels

In the forward direction on the front wheel and the backward direction on the rear wheel

In the backward direction on the front wheel and the forward direction on the rear wheel

An object is dropped from a height of 100 m. Its velocity at the moment it touches the ground is:

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100 m/sec

140 m/sec

1960 m/sec

196 m/sec

Two projectiles are fired from the same point with the same speed at angles of projection 60° and 30° respectively. Which one of the following is true?

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Their range will be same

Their maximum height will be same

Their landing velocity will be same

Their time of flight will be same

A ball falls on the surface from 10 m height and rebounds to 2.5 m. if the duration of contact with the floor is 0.01 seconds then the average acceleration during contact is

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2100 m/s²

1400 m/s²

700 m/s²

400 m/s²

Bodies failing freely under gravity provide good example of motion under

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non-uniform acceleration

uniform acceleration

variable acceleration

increasing acceleration

The horizontal range of projectile, at a certain place, depends upon

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the mass of the projectile

velocity of projection

angle of projection

angle as well as velocity of projection

If the objects of different masses move with the same velocity, then it is more difficult to stop the

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lighter of the two

massive of the two

any one of them

both of them

If the slope of the velocity-time graph increases at constant rate with time, then the body is said to have

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uniform deceleration

uniform negative acceleration

average acceleration

uniform positive acceleration

Slope of velocity time graph represents:

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Acceleration

Speed

Torque

Work

Acceleration in a body is always produced in the directin of:

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Velocity

Weight

Force

Botha B and C

The short distance between two points direction from its initial point to final point is called:

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Velocity

Displacement

Speed

Distance

For a moving body, at any instant of time

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If the body is not moving the acceleration is necessarily zero

If the body is slowing, the retardation is negative

If the body is slowing, the distance is negative

If displacement, velocity and acceleration at that instant are known, we can find the displacement at any given time in future

An airplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically above a point A on the ground, a bomb is released from it. The bomb strikes the ground, at point B. The distance AB is

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1200 m

0.33 km

3.33 km

33 km

The product of force and time is called

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acceleration

linear momentum

angular momentum

impulse

The distance covered by a body in unit time is called.

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Displacement

speed

Velocity

Both B and C

The path followed by the projectile is known as:

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Cycle

Hyperbola

Trajectory

Route

The time of flight of a projectile motion equal to

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half of the time to reach maximum height

twice the time to reach maximum height

one fourth of time to reach maximum height

time to reach maximum height

If m means mass of gases objected per second from a rocket and v shows the change in velocity, than mv is named as:

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Force

Energy

work

impulse

A body of mass 1.0 kg is falling with an acceleration of 10 m/s². Its apparent weight will be (g=10 m/s²)

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1.0 kg wt

2.0 kg wt

0.5 kg wt

Zero

If the values of instantaneous and average velocities are equal, the body is said to be moving with

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uniform acceleration

uniform speed

variable velocity

uniform velocity

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

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(i) and (ii)

(ii) and (iii)

(iii) and (iv)

Which of the following four statements is false?

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A body can have zero velocity and still be accelerated

A body can have a constant velocity and still have a varying speed

A body can have a constant speed and still have a varying velocity

The direction of the velocity of a body can change when its acceleration is constant

A train is moving with a velocity of 25 m/s and a car is moving behind it by a velocity of 8 m/s in same direction. The relative velocity of train with respect to car is

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17 m/s

33 m/s

17.5 m/s

none

Tick the conservation force:

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Tension in a string

Air resistance string

Elastic spring force

Frictional force

A car travels first half distance between two places with a speed of 30 km/h and remaining half with a speed of 50 km/h. The average speed of the car is

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37.5 km/h

10 km/h

42 km/h

40 km/h

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