Question # 1

Two parallel wires carrying currents in the opposite direction.

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Repel each other

Attract each other

Have no effect upon each other

They cancel out their individual magnetic fields.

Energy needed to produce an electron hole in solid state detector is.

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1 to 2 eV

3 to 4 eV

6 to 7 eV

8 to 9 eV

If an object moves with speed of light, its mass will be.

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Zero

Maximum

Minimum

infinity

Both xenon and caesium each have:

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41 isotopes

36 isotopes

43 isotopes

33 isotopes

The output from a full wave rectifier is

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An ac voltage

A dc voltage

Zero

A pulsating unidirectional voltage

The scientist who suggested the presence of neutron was:

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Bohr

Rutherford

Chadwick

J.J Thomson

Unit of decay constantλ is:

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ms

m^-1

m

S^-1

A metal rod of 1 m is moving at a speed of 1 ms-1 in a direction making an angle 30^o with 0.5 T magnetic field . The emf produced is.

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0.25 N

2.5 N

0.25 V

2.5 V

The physical quantity related to photon, that does not change in Compton scattering is.

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Energy

Speed

Frequency

Wavelength

The motional emf developed in a conduction depends upon.

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Length

Orientation

Magnetic field

All of the above

Binding energy for deuteron nucleus is given by

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2.8 MeV

2.23 MeV

2.28 MeV

2.25 MeV

Number of electros emitted in photo electric effect depend upon.

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Intensity of incident light

Frequency of incident light

Energy of incident light

Wavelength of incident of light

The mass of beta particle is equal to the mass

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Proton

Neutron

Electron

Photon

The sensor of light is.

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Transistor

LED

Diode

Light dependent resistance

The stopping potential for a certain metal is 10 volts. Thus work function for the cathode is.

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10 J

1.6 X 10^-18 J

1.6 X 10^-19 J

1.6 X 10³⁰ J

The unit of work function is

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Electron volt

Ampere

Volt cell

Hz

The electric potential at a mid point in an electric dipole is.

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0 V

0.5 V

1 V

1.5 V

If the distance between two charges is halved and charges are also doubled, then force between them will be.

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Two time

Four time

Eight time

Sixteen time

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