Question # 1

Which of the following does not obey ohm's law?

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Copper

Al

Diode

None

The He-Ne laser discharge tube is filled with:

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85% He

15% He

50% He

60% He

85% Ne

The torque per unit twist of coil is called

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proportionality constant

gravitational constant

boltzman constant

coupling constant

If a body reaches a speed equal to the speed of light, then its mass will became

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zero

very small

infinity

none of these

Angular frequency 'w' is basically a characteristics of

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linear motion

circular motion

both of them

none of them

Which of the following represents an electric current?

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C^-1

CS^-1

J.S^-1

dynes^-1

Crests and troughs are formed in:

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Longitudinal waves

Transverse waves

Both of these

None of these

Truth table of logic function:

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Summarizes its output values

Tabulates all its input conditions only

Display all its input/output possibilites

Is not based on logic algebra

None of these

Which one is related to angular motion:

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Moment of a force

Moment of inertia

Moment of momentum

None of these

Frequency of red color as compared to that of violet color is:

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Equal

Smaller

Greater

None of these

When a water droplet falling freely through air, the drag force on water droplet increases with th

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decrease in speed

increase in speed

pressure

none of them

Which one is the case when the wavelength is actually changed?

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When source move relative to observer

When observer move relative to source

When observer moves around a stationary source at the center of circle

When the relative displacement between source and observer is zero

A count rate 240 per minute reduces to 30 counts per min in 1 hour. The half-life of source is:

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20min

60min

80min

90min

Fringe spacing in YDS experiment will be maximum if we use:

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Red light

Green light

Violet light

Blue light

Which quantity has different units from the others

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Mass X velocity

Force X time

Energy / velocity

Power X time

A spring balance is graduated at sea level. If the body is weighted with this balance at consecutively increasing heights form the earth's surface the weight indicated by the balance will

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Go on increasing continuously

Go on decreasing continuously

Remain the same

First increase and then decrease

The relation for impulse can be written as

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F x t = mV_i- mV_f

F x t = mV

F x t = mV_f- mV_i

None of these

The value of g at the surface of moon is

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1.8 ms^-2

1.6 ms^-2

1.9 ms^-2

0.16 ms^-2

The technological uses of superconductors are

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MRI

Magnetic levitation trains

Faster computer chips

All of them

The range of the projectile means a body covers horizontal distance which is

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Maximum

Minimum

Distance

None of these

The acceleration of a motor car is 8 m/s².If the diameter of its wheel be 2 metre,its angular acceleration will be

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8 m/s²

8 radian /s²

16 m/s²

16 radian/s²

Suppose the water flows out from a pipe at 3 kgs^-1and its velocity changes from 5 ms^-1to zero on striking the ball, then force is

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5.3 N

15 N

17.3 N

19.2 N

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