Question # 1

When a body is taken out of the earth's gravitational field, the P.E. with respect to earth is

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Zero

Minimum

Maximum

geothermal

The working of the rocket is based on the principle of.

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Electromagnetism

Conservation of momentum

Floatation

Hydraulic system

A force of 10 N is acting along z-axis, its component along x -axis and y-axis is

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2 N , 8 N

3 N, 7 N

5 N each

Zero

A horizontal force of 15 N accelerates a 4 kg object rom rest along a horizontal surface at a rate of 3 m s-2 At the end of 2 s the objects momentum will be.

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12 kg m s-1

24 kg m s-1

30 kg m s-1

45 kg m s-1

The minimum velocity needed to put a satellite into the orbit

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Terminal velocity

Escape velocity

Critical velocity

Linear velocity

Candela is the SI base unit of.

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illuminance

Luminous flux

Luminous intensity

Radiant energy

Which of the following is not essential for the free oscillations of a mass attached to a spring.

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Elasticity

Gravity

Inertia

Restoring force

The maximum height reached by a projectile with a velocity of 14 m s-1 at an angle of 30 ^owith the horizontal is.

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1.5 m

2.5 m

1 m

2 m

In the case of forced oscillations frequency of oscillation is.

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The natural damped frequency

The natural undamped frequency

The frequency of the external periodic force

Some other frequency

Which statement for geostationary orbit is false.

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A geostationary orbit must be directly above the equator

All satellites in a geostationary orbit must have the same mass

The period of a geostationary orbit must be 24 hours

There is only one possible radius for geostationary orbit

The weight of a man in an elevator moving down with an accelerating of 9.8 m s-2 will be come

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Half

Zero

9.8 N

Double

A body at rest may have

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Speed

Momentum

Acceleration

Energy

The rate of change of momentum of a body falling under gravity is equal to its.

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P.E.

K.E

Weight

Density

Which quantity has dimensions different from the others.

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Energy per unit volume

Force per unit area

Angular momentum per unit mass

Pressure

The reluctance of a body to start moving is called.

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Mass

Weight

Force

Inertia

If length of second pendulum becomes four times than its time period will become

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Two times

Four times

Six times

Eight times

A mass accelerates uniformly when the resulting force acting on it.

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is zero

Is constant but not zero

Increases uniformly w.r.t time

Is proportional to the displacement of the mass from a fixed point

The SI unit of torque is

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kg ms-2

kg m2s-2

kg ms-1

kg m2 s-3

Vectors are ofhen spilt into two or more orthogonal components what is true of these components.

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they are perpendicular

They are parallel

They are antiparallel

They have same magnitude

The 1st condition of equilibriums satisfied if.

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Linear acceleration is zero

Angular acceleration is zero

The vector sum of all the forces is zero

The vector sum of all the torque is increase

A particle performs SHM of amplitude 0.020 and frequency 2.5 Hz. What is its maximum speed.

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0.050 m s-1

0.125 m s-1

0.314 m s-1

0.75 m s-1

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