Question # 1

The band above the valence band is called

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high energy band

conduction band

empty band

none of them

Alternating current can be transmitted:

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To long distance

At very high cost

At very low cost

Both (A) and (C)

Both (A) and (B)

From the theory of relativity, momentum p of the photon is related to energy as

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p = hfc

p = hf/c

p = f(hc,f)

p = cf/h

The total energy of spring mass system is

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zero

changing with time

constant

none of them

The modulus of elasticity can be written as

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stress x strain

strain/stress

1/2 x stress x strain

stress/strain

The relationship between Boltzmann constant k with R and N_Ais given as:

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k = RN_A

k =R/N_A

k = NR/N_A

None of these

S.I. unit of planks constant is

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J-s^-1

J.s

J.s^-2

J.s²

A charge Q is divided into two parts q and Q - q and separated by a distance R. The force of repulsion between them will be maximum when

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q = Q/4

q = Q/2

q = !

None of these

When a large number of atoms are brought close to one another to form a solid, each energy level of an isolated atom splits into sub-levels, called

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energy bands

energy shells

states

all of them

Earth is considered to be

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a non-inertial frame

an inertial frame

an accelerated frame

none of the above

The passage of current is accompanied by a magnetic field in the surrounding space:

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Always accompanied

Sometimes accompanied

Never accompanied

Any of above

None of these

Plane microwaves are incident on a long slit having a width of 5 cm.The wavelength of the microwaves if the first minima is formed at 30° is

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25 cm

5 cm

2.5 cm

5 mm

Impulse is the force applied for a very short interval time in which force is

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Constant

Not constant

May be constant for some time

None of these

Temperature remain constant the volume of given mass of a gas is inversely proportional to the pressure applied on it. it is called

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General gas law

Boyle's law

Charles law

None of these

When a constant force is applied on a body it moves with uniform

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Acceleration

Velocity

Speed

Momentum

The quantity mr² is known as

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Moment arm

Moment of inertia

Moment of force

None of these

A diode characteristics curve is a graph plotted between;

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Current and time

Voltage and time

Voltage and current

Forward voltage and reverse current

One light year is equal to

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9.5 x 10¹⁵m

9.5 x 10¹⁵sec

9.5 x 10¹⁵km

9.5 x 10¹⁵cm

In multi-mode step index optical fibre, that layer is called cladding which has

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higher refractive index

lower refractive index

both of them

none of them

Shear modulus for brass is

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36

39

51

65

Keeping in view the Earth surface the value of g on the equator is

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Zero

Minimum

Maximum

None of these

A device which is based upon the thermodynamic property of matter is

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Thermometer

Thermo state

Heat engine

Calorimeter

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