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 number 0.02 x 10^-8in standard form will be written as.

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2 x 10^-10

2 x 10^-8

20 x 10^-8

20 x 10^-6

The value of 'g' is maximum

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Above the earth's surface

Below the earth's surface

At the earth's surface

At the centre of earth

The reluctance of a body to start moving is called.

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Mass

Weight

Force

Inertia

On the ground the gravitational force on a satellite is W What is the gravitational force on the satellite when at height R/50

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0.96 W

0.98 W

1.04 W

1.02 W

It the force acting on a body is doubled its acceleration becomes.

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Half

Constant

Double

One fourth

A body of mass 2 kg attached to a spring is pulled to a distance of 4 cm What will be the value of spring constant K.

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490 N m-1

980 N m-1

1260 N m-1

1960- N m-1

Rate of change of momentum is called.

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Torque

Force

Impulse

Inertia

The time period of a simple pendulum is independent of its.

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Length

Mass

Acceleration due to gravity

Restoring force

The magnitude of resultant of three forces is 3. Its x -component is 2 and y component is 1, then its z-component will be.

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1

2

3

4

A simple pendulum suspended from the celling of a lift has a time period T when the lift falls freely the time period of the pendulum will become

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Zero

T/9.8

9.8 T

Infinity

The SI unit of torque.

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kg m2

kg ms-2

kg m2 s-2

kg ms -1

Which of the following is dimensionless.

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Strain

Stress

Pressure

Volume

A ball is thrown straight up What is its acceleration just before it reaches the highest point.

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Zero

slightly less than g

Exactly g

Slightly greater than g

A car is travelling with uniform acceleration the road has check posts every 100 m When the car passes one post , it has a speed of 10 m s-1 and when passes the next one its speed is 20 ms-1 What is the cars acceleration.

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0.67 m s-2

1.5 m s2

2.5 m s-2

6.0 m s-2

The centre of mass of a system is a point where an applied force causes the system to move.

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With rotation

Without rotation

Fastly

Slowly

The centre of gravity of a body is

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The centre of the body

The point at the mass of the body acts

The point at which the whole weight of the body acts

The point of rotation

The dimensions of torque are.

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[MLT-2]

[ML-1T-1]

[ML2T-2]

[ML-2]

The process where by energy is dissipated from the oscillating system is called.

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Resonance

Damping

Forced oscillation

Free oscillation

In an ideal case, when no K.E. is lost the collision is.

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Perfectly elastic

Perfectly inelastic

May or may not be elastic

May or may not be inelastic

the consumption of energy by a 60 watt bulb in 2 s is

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0.02 J

30 J

120 J

60 J

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