Question # 1

A ball mass 0.25 kg is thrown to a height of 20 m The change in G.P.E is

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49 J

50 J

-75 J

500 J

Which vector gives the displacement from one point another in space.

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Null vector

Position vector

Unit vector

Distance vector

Solar cells are thin wafers made from

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Uranium

Nickel

Silicon

Cadmium

The unit formed by combining the fundamental untis of length , mass and time.

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Absolute units

Practical units

Bse unit

Derived units

The SI unit of momentum is.

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kg m s-2

kg m2 s-2

kg m s-1

kg s-1

A physical quantity which produces rotation in a body is called.

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Force

Torque

Momentum

accelerate

The dimensions of work are

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[MLT-2]

[ML2T-2]

[ML2T-1]

[MLT-1]

Which of the following is SI base unit for temperature.

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Celsius

Kelvin

Fahrenheit

Rankine

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

The graph between restoring force and time in SHM is a

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Straight line

Parabola

Sine wave

Circle

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

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Half

Constant

Double

One fourth

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

In any collision between two bodies there need nor the conservation of

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Linear momentum

Angular momentum

Total energy

Kinetic energy

While passing through the atmosphere total energy is reduced due to.

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scattering

Absorption

Reflection

All of these

One radian is equl to

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57.3 ^o

67.3 ^o

60 ^o

87.3 ^o

The action and reaction forces

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Must act upon the same body

Must act upon different bodies

Must be equal in magnitude but need not have the same line of action.

Different speed at the different height during ascent and during descent.

Which of the following type of force can do no work on the particle on which it operates.

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Gravitational force

Frictional force

Centripetal force

Elastic force

If the rate of change of momentum w.r.t Time is zero then

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Momentum is a function of time

Momentums is not conserves

Momentum is constant

The impulse is into he same direction as the momentum

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

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 centre of gravity of a cylinder is.

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At the intersection of medians

At the centre

At the middle point of axis

At the intersection of diagonals

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