Question # 1

The bands below the valence band are

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completely filled and play active part in conduction process

completely filled and plays no part in conduction process

completely filled and play active part in conduction process

not completely filled and play no part in conduction process

A mass difference of 0.0012 u is equivalent to and energy of:

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0.5 Me V

1.13 MeV

5.13 MeV

1.13 keV

1.13 eV

With the propagation of a longitudinal wave through a material medium, the quantities transmitted in the propagation direction are

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Energy, momentum and mass

Energy

Energy and mass

Energy and linear momentum

Absolute zero is considered as that temperature at which:

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All liquid become gases

All gases become liquid

Water freezes

None of these

The concept of field theory was put forward by

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Franklin

Kepler

Oersted

Michael Faraday

Alfa , beta and gamma rays are emitted from a radio-active substance

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spontaneously

when it is heated

when it is exposed to light

When it interacts with the other particle

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

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1900

1906

1912

1918

The mass of a body measured by a physical balance in a lift at rest is found to be m, if the lift is going up with an acceleration a, its mass will be measured as

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m (1 - a/g)

m (1 + a/g)

m

Zero

Swimming becomes possible because of______law of motion.

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First

Second

Third

None of these

If an amount of heat enters the system it could

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decrease the internal energy

not change the internal energy

increase the internal energy

none of them

Which one of the following could be the frequency of ultraviolet radiation?

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1.0 x 10⁶Hz

1.0 x 10⁹Hz

1.0 x 10¹²Hz

1.0 x 10¹⁵Hz

Electrolysis is the study of conduction of electricity through:

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Solids

Liquids

Gases

Plasma

A certain force gives an acceleration of 2 m/sec2 to a body if mass 5 kg. The same force would give a 29 kg object an acceleration of:

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0.5 m/sec2

5 m/sec2

1.5 m/sec2

9.8 m/sec2

The resistance of 20 cm long wire is 10Ω. When the length is changed to 40 cm. The new resistance is

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10Ω

20Ω

30Ω

40Ω

The magnitude of alternative voltage V:

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Always increase

Always decrease

Remains constant

Does not remain constant

None of these

Maric Curie and Pieree Curie discovered two new radioactive elements, which are called

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polonium uranium

uranium and radium

polonium and radium

none of these

For production of beats the two sources must have

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Different frequencies and same amplitude

Different frequencies

Different frequencies, same amplitude and same phase

Different frequencies and same phase

The restoring force always directed towards the

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extreme position

mean position

both of them

none of them

The direction of the streamlines is the same as the direction of the

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force

torque

velocity

weight

Tesla is the unit of

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Magnetic induction or flux density

Magnetic flux

Self inductance

None of these

In case of metallic conductors, the change carries are:

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Protons

Electrons

Antiprotons

Positrons

Both (A) and (B)

During the upward motion of the projectile, the vertical component of velocity:

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Decreases

Increases

Remains constant

None of these

Compton shift refers to:

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Photon

Meson

Proton

Positron

Both (B) and (D)

The example/s of non-electrical energy to electrical is/are:

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Chemical energy

Mechanical energy

Heat energy

Both (A) and (B)

All of these

A string is stretched between two points and is plucked at right angles to its length, the vibration produced is:

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Longitudinal wave

Transverse wave

No vibration at all

None of them

A beam of electrons is provided by an

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electron gun

Suppray

Injection

None of these

Gaussian surface is always:

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Rectangular

Spherical

Cylindrical

Box shape

Any of these

γ-rays behave like a particle because they explain the

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Compton effect

Photoelectric effect

Pair-production

all the above

The terminal velocity of a small size spherical body of radius R moving in a fluid varies as

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R

R²

1/R

(1/R)²

Electrons are

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positive charged

negatively charged

massless

neutral

An inertial frame is that frame in which

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a>0

a=0

a<0

none of these

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