Question # 1

The series in infrared region is:

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Paschen series

Bracket series

Pfund series

All of above

In three phase A.C supply coils are inclined at an angle of.

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0^o

90^o

120^o

80^o

The SI unit of E is NC-1 and that of B is Na-1 m-1 then the unit of E/B is.

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ms-2

ms

ms^-1

m-1s-1

Target material used in x-rays tube have following properties.

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High atomic number and high melting pouint

High atomic number and low melting pouint

Low atomic number and low melting pouint

High atomic number only

One joule is equal to.

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1.6 x 10¹⁹ eV

1.6 x 10^-19 eV

6.25 x 10^-18 eV

6.25 x 10 ¹⁸ eV

For non-ohmic devices, the graph between V and I is

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Not a straight line

A straight line

A curve

All of above

The direction of induced current is always so as to oppose the change which causes the current is:

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Faraday's law

Lenz's law

Ohm's law

Kirchhoff's 1st rule

If D.C. input for step up transformer, the output is

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Zero

High

Low

May be high or low

A device used for detection of current is called.

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Inductor

Voltmeter

Capacitor

Galvanometer

An electric field cannot deflect

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X-rays

a-particles

ß-particles

None of these

Out of the following which material is brittle.

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Wrought iron

Copper

Tungsten

High steel carbon

A wire stretched to double of its length, its strain is:

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2

1

0

0.5

The effective value of any sinusoidal alternating current or voltage is

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None of the above

X-rays were discovered by

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Curie

Henry Becquerel

Rontgen

None of these

The device which allows only the flow of D.C. is.

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Capacitors

transformer

Inductor

Generator

The name of the scientist who noted that a compass needle was deflected when placed near the current carrying conductor

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Henry

Faraday

Coloumb

Oersted

The quantity/factor h/m_oc has the dimensions of.

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Length

Time

Mass

Energy

The sensor of light is.

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Transistor

LED

Diode

Light dependent resistance

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