Question # 1

Which of the following is a scalar quantity

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Density

Displacement

Torque

Weight

In LCR series AC circuit the phase angle between current and voltage is

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Any angle between 0 and ±π/2

π/2

π

Any angle between 0 and π/2

A 220 V, 50 Hz, AC source is connected to an inductance of 0.2.H and a resistance of 20 ohm in series What is the current in the circuit?

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10 A

5 A

33.3 A

3.33 A

Copper and germanium are cooled to 70 K from room temperature then

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Resistance of copper increases while that of germanium decreases

Resistance of copper decreases while that of germanium increases

Resistance of both decreases

Resistance of both increases

A body moving in circular motion with constant speed has

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Constant velocity

Constant acceleration

Constant kinetic energy

Constant displacement

Band spectrum in produced by

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H

He

H₂

Na

A photocell with a constant p.d of V volt across it illuminated by a point source from a distance of 25 cm. When the source is moved to a distance of 1 m, the electrons emitted by the photocell

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Carry 1/4th their previous energy

Are 1/6th as numerous as before

Are 1/4th as numerous as before

Carry 1/4th their previous momentum

If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in he form of heat will be

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0.1 watt

1 watt

10 watt

100 watt

A p-n junction has a thickness of the order of

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1 cm

1 mm

10^-6 cm

10^-12 cm

A man pushes a wall but fails to displace it. He does:

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Negative work

Maximum positive work

Positive work but not maximum

No work

Steel is preferred for making springs over copper.Whey?

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Steel is cheaper

Young's modulus of steel is more than that of copper

Young's modulus of copper is more than that of steel

Steel is less likely to be oxidized

If the period of oscillation of mass (M) suspended from a spring is 2s, then the period of mass 4M will be

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1 s

2 s

3 s

4 s

Absolute temperature can be calculated by

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Mean square velocity

Motion of the molecule

Both A and B

None of these

The magnetic moment of a circular coil carrying current is

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Directly proportional to the length of the wire in the coil

Inversely proportional to the length of the wire in the coil

Directly proportional to the square of the length of the wire in the coil

Inversely proportional to the square of the length of the wire in the coil

Two electric bulbs of 200 W and 100 W have same voltage. If R₁and R₂be their resistance respectively then

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R₁=2R₂

R₂=2R₁

R₂=4R₁

R₁=4R₂

Ball pen function on the principle of

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Viscosity

Boyle's law

Gravitational force

Surface tension

A photoelectric cell coverts

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Electrical energy to light energy

Light energy to light energy

Light energy to electrical energy

Light energy to elastic energy

Who explained the origin of the Fraunhoffer lines?

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Fraunhoffer

Kirchhoff

Fresnel

Snell

If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in the form of heat will be

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0.1 watt

1 watt

10 watt

100 watt

Energy is stored in the choke coil in the form of

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Heat

Magnetic energy

Electric energy

Electro-magnetic energy

Angular momentum is

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Vector (axial)

Vector (polar)

Scalar

None of these

The mass defect for the nucleus of helium is 0.0303 a.m.u. What is the binding energy per nucleon for helium in MeV?

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28

7

4

1

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