Question # 1

The output from a full wave rectifier is

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An ac voltage

A dc voltage

Zero

A pulsating unidirectional voltage

The following gas was identified in the sun using spectroscopy

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Hydrogen

Helium

Carbon

Nitrogen

The unit of temperature co efficient of resistivity is.

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Ohm -m

K-1

K

Ohm

The electrostatic force between two charges is 42 N, If we place a dielectric of E_y=2.1 between the charges then the force become equal to.

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42 N

88.2 N

20 N

2 N

e/m=

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v/Br

Br/V

VB/r

Vr/B

If there is no fourth band, tolerance is shows as

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10%

A moving charge is surrounded by:

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2 Fields

3 Fields

4 Fields

None of these

Charge on an atom is:

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Positive

Negative

Neutral

None of these

100 micro F capacitor is connects to an AC voltage 24 V and frequency 50 Hz. The reactance of the capacitor is.

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30.8 Ohm

31.8 Ohm

34.8 Ohm

40 Ohm

The basic circuit element in A.C. circuit which controls current.

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Resistor only

Capacitor only

Inductor only

All of these

The induced emf in a coil is proportional to:

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Magnetic flux through the coil

Rate of change of Magnetic flux through the coil

Area of the coil

Product of magnetic flux flux and area of the coil

By modern system of NAVSTAR, the speed any where on the earth can be determined to accuracy about.

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20 ms-1

10 ms-1

2 cms-1

2 ms-1

Using relativistic effects the location of an air craft after an hour fight can be predicated about

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20 m

50 m

760 m

780 m

The heat produced by passage of current.

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H=I²Rt

H=IR2T

H=I/Rt

H=I²/Rt

In full wave rectification number of diodes required are equal to.

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2

3

4

5

Hydrogen atom spectrum does not lie in

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Ultraviolet region

Visible region

Infrared region

X ray region

Which of the following does not undergo plastic deformation.

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Copper

Wrought iron

Head

Glass

Ampere's law is applicable to:

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Circular path

Rectangular path

To any closed path

Nonwe of these

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