Question # 1

Solar cells are thin wafers made from

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Uranium

Nickel

Silicon

Cadmium

a 5 kg mass is falling freely the force acting on it will be.

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0 N

9.8 N

5 N

19.6 N

Which of the following statements concerning G and g is true.

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g is scalar white g is a vector

g is inversely proportional to the mass of the planet

g is independent of the mass of the planet

both G and g have the same units

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 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

What is the period of geostationary satellite.

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6 hours

12 hours

18 hours

24 hours

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

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Resonance

Damping

Forced oscillation

Free oscillation

An example of simple harmonic motion is

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Fast moving cricket ball

Motion of bicycle

Motion of a bee

Motion of simple pendulum

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

In an Isolated system , total energy of the vibrating's mass and spring is

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Low

High

Constant

Variable

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

Resonance phenomenon in a vibrating body

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May increase the amplitude

May decrease the amplitude

May not affected the amplitude

All of the above

The SI unit of torque.

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kg m2

kg ms-2

kg m2 s-2

kg ms -1

Acceleration due to gravity is not affected by which one of the following

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Latitude

Attitude

Longitude

Depth

In the absence of air resistance all objects regardless their weights, fall with

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Same velocity

Different velocity

Same acceleration

Different acceleration

If the vector sum of all the torques is zero then

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1st condition is satisfied

2nd condition is satisfied

Centre of mass is lowered

Gravity becomes zero

When velocity of the body is doubled, which one is doubled too.

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K.E.

P.E

Momentum

Acceleration

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

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Null vector

Position vector

Unit vector

Distance vector

Which of the following quantities is zero about the centre of mass of body.

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Mass

acceleration

Moment

Angular acceleration

The force of gravity between two objects does not depend upon the.

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Constant of gravitation

Separation

Product of their masses

Sum of their masses

If two non zero vectors are perpendicular to each other then their scalar product is equal to.

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-1

1

0

Infinity

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