Question # 1

When a constant potential difference is applied across the conductor, the drift velocity of electrons:

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Increases

Decreases

Remains the constant

Either of these

None of these

The number of field lines passing through unit area held perpendicular to the field lines represent:

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Flux in that region

Intensity of the field

Charge

Area of the region

None of these

The half lie of radium-226 is

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238 years

4.5 x 10⁹days

1620 years

332 years

The maximum drag force on a falling sphere is 9.8 N, it weight is

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1 N

9.8 N

4.9 N

Cannot be calculated

Rate of decay is actually described by.

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Half line

Decay constant

Mean life

Total life

None of these

The minimum resistance that can be obtained by connecting 5 resistance of 1/4Ωeach is

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4/5Ω

5/4Ω

20Ω

0.05 Ω

Torque is also called:

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Momentum

Linear inertia

Moment of a force

Mass

The force applied on unit area to produce any change in the shape, volume or length of a body is known as

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strain

elasticity

stretching

stress

When a mass 'm' is pulled slowly, the spring stretches by an amount x₀,then the average force would be

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F= Kx₀

F=1/2Kx₀

F=2Kx₀

F=4Kx₀

The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called

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Diffraction

Interference

Polarization

Dispersion

Viscosity of water is ______ that of air but ___ that of plasma.

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More, more

Less, more

Less, less

More, less

When a stress changes the shape, it is called the

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compressional stress

tensile stress

shear stress

any one of them

According to Young s experiment the distance between two adjacent bright fringes of blue light is _____ than for oranges light

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Less

Maximum

Equal

May be less may be greater depending upon slit spacing

The internal energy of a gram mole of an ideal gas depends upon

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Pressure alone

Volume alone

Temperature alone

Both pressure and temperature

If the instant velocity does not change, the body is moving with a

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Initial velocity

Variable velocity

Uniform velocity

None of these

Moment of inertia does not depend upon

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Angular velocity

Mass

Position of axis of rotation

None of these

A metal plate of thickness half the separation between the capacitor plates of capacitance C is inserted.The new capacitance is

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C

C/2

Zero

2C

The curie temperature of iron is called

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250°C

500°C

750°C

1000°C

The cause of mirage observed in deserts in bright sunlight is due to:

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Refraction of light

Reflection of light

Scattering of light

Total internal reflection of light

The velocity of rain drop attains constant value because of

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Surface tension

Upthrust of air

Viscous force exerted by air

Air currents

The product of moment of inertia and angular velocity is called

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Angular momentum

Kinetic energy

Torque

Work

If two non zero vectors A and B obey the relation |A + B| = |A - B|.then the angle between them is:

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120°

90°

60°

0°

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