Question # 1

Internal energy is the sum of all the forms of

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K.E

P.E

both of them

none of them

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

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thermoionic electrons

free electrons

photoelectrons

slow electrons

The conventional current is the name given to current due to flow of

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Positrons

Positive charges

Negative charges

Both A and C

None of these

The torque per unit twist of coil is called

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proportionality constant

gravitational constant

boltzman constant

coupling constant

The value of the input resistance of OP-AMP is of the order of

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few ohms

few hundred ohms

several kilo ohms

several maga ohms

The critical temperature of mercury is

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1.18 K

4.2 K

3.72 K

7.2 K

In a normal healthy person the value of diastolic pressure is

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75 - 80 torr

100 torr

120 torr

none of them

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

The electric field, magnetic field and the direction of their propagation are mutually

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perpendicular

parallel

none of these

In a building, there are 15 bulbs of 40 watts, 5 bulbs of 100 watts, 5 fans of 80 watts and a heater of 1 kilowatt. The voltage of the electric main is 220 volts. The minimum efficiency of the main fuse of the building will be

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0.4 A

11.4 A

9.8 A

10.6 A

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10^-15is

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9 x 10⁵V

9 V

8 x 10⁶V

80 V

An ECG records the electric process in heart between

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Points on human skin

Two limbs of human foot

Two lungs of human

None of these

If the distance of a surface from light source is doubled,then the luminance will become

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1/4 times

1/2 times

2 times

4 times

The speed of swimming of porpoise is

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5 ms^-1

6 ms^-1

8 ms^-1

9 ms^-1

The bottom of a container filled with liquid appear slightly raised because of

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Refraction

Interference

Diffraction

Reflection

Amorphous solids are called

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Polymeric

Crystal

Glassy solids

All

The first superconductor was discovered by

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Fermi

Kmaerlinghormes

Weinberg

None of these

Dimensions of impulse are similar to the dimensions of

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torque

work

force

momentum

Polythene,polystyrene and nylon are example of

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Polymeric solids

Crystalline solids

Glassy solids

Angle subtended by any side of the eight-sided mirror at the center is

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π/8

π/4

2π/8

2π/4

the ratio of mean K.E of chlorine and oxygen molecules at same temperature is

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16 35.5

35.5 16

(35.2)²16

1 1

At 0 K a piece of Ge and Si is a perfect

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Conductor

Insulator

Semiconductor

None of these

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