Question # 1

The path followed by the projectile is known as:

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Cycle

Hyperbola

Trajectory

Route

The projectile attains maximum horizontal range when it is projected at an angle of

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30°

45°

60°

75°

In equation F=ma, then mass 'm' is

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rest mass

variable mass

inertial mass

gravitational mass

For a fixed force, larger is the mass of a body the

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greater is its acceleration

smaller is its acceleration

smaller is its weight

zero is its acceleration

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 railway engine (mass 10⁴kg) is moving with a speed of 73 km/h. The force which should be applied to bring it to rest over a distance of 20 m is

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3,600 N

7,200 N

10,000 N

100,000 N

A dirty carpet is to be cleaned by heating. This is an accordance with____ law of motion:

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First

Second

Third

None of these

A typical rocket consists of fuel

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more than 60% of launch mass

less than 60% of launch mass

less than 80% of launch mass

more than 80% of launch mass

Range of a projectile is R, when the angle of projection is 30° . Then, the value of the other angle of projection for the same range, is

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45°

60°

50°

40°

Suppose the water flows out from a pipe at 3kg s^-1and its velocity changes from 5m s^-1to zero on striking the wall, then the force exerted by water on wall will be

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5 N

10 N

15 N

20 N

A ball is dropped from a height of 4.2 meters. To what height will take it rise if there is no loss of KE after rebounding?

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4.2 m

8.4 m

12.6 m

none of these

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 product of force and time is called

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acceleration

linear momentum

angular momentum

impulse

If the velocity of the body decreases non-uniformly then the slope of the velocity-time graph will have

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different values

same values

zero valves

constant valves

A boat of mass 40 kg is at rest, A dog of mass 4 kg moves in the boat with a velocity of 10 m/s. What is the velocity of boat?

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4 m/s

2 m/s

8 m/s

1 m/s

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

Which one of the following is dimensionless.

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Acceleration

Velocity

Density

Angle

Velocity of a body changes if

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direction of the body changes

speed of the body changes

neither speed nor direction changes

either speed or direction changes

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

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

Ethanol (alcohol) as a type of:

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Electric fuel

Bio fuel

Nuclear fuel

None of these

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

Ethanol (alcohol) is a type of:

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Electric fuel

Bio fuel

Nuclear fuel

None of these

When a person jumps off the ground, the reaction force of the ground is

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greater than the weight of the person

smaller than the weight of the person

equal to the weight of the person

zero

The motion of a projectile is

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one dimension

two dimension

three dimension

all of them

A particle of mass 0.5 g moving along x-axis is located of x₁= 15 m at t₁= 5s and x₂= 33 m at t₂= 13s its average velocity is

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6 m s^-1

2.45 m s^-1

2.25 m s^-1

4.45 m s^-1

An aircraft is moving with a velocity of 300 ms^-1. If all the forces acting on it are balanced, then

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It still moves with the same velocity

It will be just floating at the same point in space

It will be fall down instantaneously

It will lose its velocity gradually

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

An object thrown upward with an initial velocity at certain angle with the horizontal and moving freely under the action of gravity is called

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a rocket

an aeroplane

a projectile

a ballon

The direction of the linear momentum is the direction of

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speed

velocity

weight

none of them

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

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