Question # 1

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

A typical rocket consumes about

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100 kg s^-1of fuel

1000 kg s^-1of fuel

10000 kg s^-1of fuel

100000 kg s^-1of fuel

A motorist travels A to B at a speed at 40 km/h and returns at speed of 60km/h. His average speed will be

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40 km/h

48 km/h

50 km/h

60 km/h

Acceleration produced in a body by the force varies

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inversely as the applied force

directly as the applied force

directly as the mass of the body

none of them

The discuss used by athlete has a mass of 1 kg, its weight in newton is

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9.8 N

80 N

98 N

100 N

The displacement coincides with the path of the motion when a body moves is a

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curved line

straight line

may be curved or straight

none of them

A rocket carries its own fuel in the form of

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liquid only

liquid or solid

liquid and solid

liquid or solid and oxygen

The second law gives the relationship between

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mass and velocity

force and acceleration

velocity and acceleration

mass and weight

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

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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 above

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

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30°

45°

60°

75°

The mass of the object is a quantities measure of its

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speed

velocity

acceleration

inertia

A body whose momentum is constant must have constant

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Acceleration

Velocity

Force

None of these

The path followed by the projectile is known as:

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Cycle

Hyperbola

Trajectory

Route

Tick the conservation force:

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Tension in a string

Air resistance string

Elastic spring force

Frictional force

When the surfaces are coated with a lubricant, then they

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Stick to each other

Slide upon each other

Roll upon each other

None of these

The sum of the magnitude of two forces acting at a point is 18 and the magnitude of their resultant is 12. If the resultant is at 90° with the force of the smaller magnitude, then their magnitudes are

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3, 15

4, 14

5, 13

6, 12

The projectile motion is composed of

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horizontal motion only

vertical motion only

horizontal and vertical motion

none of them

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

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

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Velocity

Weight

Force

Botha B and C

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

An object thrown in arbitrary direction in space with an initial velocity and moving freely under gravity will follow

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a circular path

a straight line

a hyperbola

a parabola

The vertical and horizontal range will be equal id angle of projection is

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76°

45°

60°

120°

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