Question # 1

Electric intensity due to an infinite sheet of charge is:

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∂/2ε_∘

∂/rε_∘

∂/r2ε_∘

none of these

Photo diode is used for detection of.

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Heat

Magnet

Current

Light

The potential difference between the head and tail of an electrical to

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600 Volt

700 Volt

800 Volt

900 Volt

1 gray is equal to.

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1 JKg-1

1KgJ-1

1JKg

1 JKg-2

Electro magnetic waves emitted from radio antenna are.

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Stationary

Longitudinal

Transvers

Both a and b

The unit of impedance is

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Farad

Henry

Tesla

Ohm

Platinum wire becomes yellow at a temperature of.

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900^oC

1300^oC

1600^oC

500^oC

In RLC series circuit at resonance the phase difference between capacitor and inductor reactance is.

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90^o

270^o

0^o

180^o

Minimum number of semi conductor diodes required for full wave rectification are.

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1

2

3

4

The device in the circuit that consume electrical energy are known as.

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Dissipaters

Generator

Load

Motors

Most of the electrons in the base of an NPN transistor flow:

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Out of the base lead

Into the collector

Into the emit

Into the base supply

Materials can be identified by measuring their

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Mass

Half life

Both a and b

None of a,b,c

A soft iron cylinder is placed inside coil galvanometer to:

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Make field circular and strong

Make field radial and weak

Make field radial and strong

All of above

The sensitivity of galvanometer is given by

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CAN/B

C/BAN

BAN/C

BN/CA

The permeability of free space is measured in

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wb A/m

Am/wb

wb/Am

m/wbA

In an LRC circiut, the capacitance is made one-fourth, when an resonance . Then what should be change in inductance, so that the circuit remain in resonance?

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4 times

1/4 times

8 times

2 times

A charged particle enters in a strong magnetic field its K.E.

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Remain constant

Increases

Decreases

Increases then decreases

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