Question # 1

The value of g at a height one Earth's radius above the surface of the earth is:

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2g

1/2 g

1/3 g

1/4 g

What of the following is a god radiator of heat?

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a Shinning silvered surface

a dull black surface

a white black surface

a shinning colored surface

Rate of change of momentum is equal to:

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Mass

Torque

Weight

Force

Significant figures in an expression are.

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All the digits

All accurately known digits

All the accurately known digits and the first doubtful digit.

All the accurately known digits and all the doubtful digits.

Weight of the body is due to the :

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Gravitation force

Centripetal force

Centrufugal force

All of the above

The unit of acceleration is.

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ms-1

ms

ms^-2

ms²

It is useful to know the location of center of gravity of a body in problem dealing with

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Motion

Equilibrium

Charge

Velocity

From following, which one is a renewable source of energy?

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Coal

Gas

Sunlight

Petrolum

When a body is lifted through height h, the work done on it appears in the form of its

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Kinetic energy

Potential eneger

Elastic potential energy

Geothermal energy

Centripetal force always acts _________ to the motion:

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Opposite

Parallel

Perpendicular

Upward

Room are heated using gas heaters by:

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Conduction only

Convection and radiation

Radiation only

Convection only

Which of the following is a method of energy transfer:

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Conduction

Radiation

Wave motion

All of these

The value or current I passing through a conductor is inversely proportional to:

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Temperature

Potential difference

e.m.f.

resistance

The power of small fan is:

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40 W

50 W

60 W

80 W

The S.I unit of Spring constant is:

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Nm

N

Nm-1

Ns

Which is the best material for making connecting wires:

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Iron

Copper

Tungsten

Nickel

Changing magnetic field in a closed circuit can induce:

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e.m.f

Electric current

Force

Both A and B

Mathematical formula of spring constant is:

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F/x

X/F

F/t

F/m

A device which has two way communication is:

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Television

Radio

Hard disk

Mobile phone.

The speed of sound in a liquid is …………..than that in gases:

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Ten times

Fifteen times

Five times

Two times

Astronauts in space need to communicate with each other by radio links because:

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Sound waves travel very slowly in space

Sound waves travel very fast in space

Sound waves cannot travel in space

Sound waves have low frequency in space

The output of a NAND gate is 0 when

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Both of its inputs are 0

Both of its inputs are 1

any of its inputs is 0

any of its inputs is 1

Which one of the following force cannot do any work on the particle on which it acts.

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Fractional force

Gravitational force

Electrostatic force

Centripetal force

A stationary waves is established din a string which vibrates in four segments at a frequency of 120 Hz, Its fundamental frequency is.

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15 Hz

30 HZ

60 Hz

480 Hz

The distinguish between transverse and longitudinal wave_______ is used.

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Refraction

Interference

Diffraction

polarization

In reversible process the entropy of system.

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Remain constant

Decrease

Increase

Becomes zero

The diver spins faster when moment of inertia becomes.

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smaller

Greater

Constant

Zero

Hygen's principle is used for.

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Explain polarization

Locate the wave front

Find the speed of light

Find the index of refraction

Minimum number of unequal forces whose vector sum can be zero are.

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5

4

3

2

When a vector is multiplied by a (-)ve number its direction

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Remains constant

Reversed

Change by 90°

None of these

The formula for the power is

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P= W/d

P=W/v

P=W/t

P=Wt

the example of mechanical waves is

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Water waves

Infrared waves

Radio waves

Ultraviolet waves

Speed of sound in aluminum at 20 ^oC is.

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3600 m/s

5100 m/s

5130 m/s

3500 m/s

When gama rays are emitted, the nuclear mass.

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Decreases by 4 units

Does not change

Increases by 2 units

Increase by 1 unit

Lenz's law deals with

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Magnitude of emf

Direction emf

Direction of induced current

Resistance

The input resistance of an op amplifier is.

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Low

High

Zero

Equal to output resistance

A solid having regular arrangement of molecules throughout its structure is called.

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Amorphous solid

Polymeric solid

Crystalline solid

Glassy solid

The galvanometer can be made sensitive by making the factor BAN/C

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Large

Small

Constant

Zero

In case of inductor , energy is stored in the

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Electric field

Magnetic field

Potential field

Gravitational field

1 kg mass will be equivalent to energy.

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9 x 10⁸ J

9 X 10¹² J

9 X 10¹⁶ J

9 X 10¹⁹ J

NC-1 is the SI unit is

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Force

Charge

Current

Electric intensity

The product of resistance and conductance is

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1

Resistivity

Conductance

Zero

By winding the coil around a less magnetic core, self induction.

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Will increase

Will decrease

Remain same

First increase then decrease

Glass and high steel carbon are example of.

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Ductile substances

Brittle substances

Soft substances

Hard substances