Question # 1

The minimum wavelength of the X-rays produced by electrons accelerated through a potential difference of V volts is directly proportional to

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√V

V²

1/√V

1/V

The conductivity of a superconductor is

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Infinite

Very large

Very small

Zero

In which case application of angular velocity is useful?

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When a body is rotating

When velocity of body is in a straight line

When velocity is in a straight line

None of these

In an L-R circuit time constant is that time in which current grows from zero to the value

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0.63 I_o

0.50 I_o

0.73 I_o

I_o

The contrast in the fringes in any interference pattern depends on

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Fringe width

Intensity ratio of the sources

Distance between the slits

Wavelength

The frequency of the incident light falling on a photosensitive metal plate is doubled the kinetic energy of the emitted photoelectrons is

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Double the earlier value

Unchanged

More than doubled

Less than doubled

A capacitor acts as an infinite resistance for

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AC

DC

Both AC and DC

Energy is stored in the choke coil in the form of

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Heat

Magnetic energy

Electric energy

Electro -magnetic energy

The product of the pressure and volume of an ideal gas is

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A constant

Approximately equal to the universal gas constant

Directly Proportional to its temperature

Inversely proportional to its temperature

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