Question # 1

The series in infrared region is:

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Paschen series

Bracket series

Pfund series

All of above

The SI unit of decay constant is

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m

m^-1

S^-1

Nm^-1

Einstein photoelectric equation is

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None of these

Photo electrons are emitted y using visible light when the metal is.

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sodium

Copper

Nicked

Cobalt

Donor impurities are

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Germanium, silicon

Indium, galium

Antimony, arsenic

Diamond, carbon

In Compton scatting, the value of shift is equal to Compton's wavelength, when X-rays is scattered at the angle of.

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90^oC

Zero

120^oC

45^oC

Photo diode detects.

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Visible light

Radio waves

X rays

All of them

The longest wavelength of Paschen series is.

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656 nm

1094 nm

1875 nm

2000 nm

The unit of permiability of free space is:

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T.m/A

T.m²/A

T.m/A²

None of these

When a wire of length 'l' and resistance R is cut into two equal parts then resistivity of each part.

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is doubled

Remains the same

Is halved

Is one fourth

The electromagnetic spectrum contains

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Radio waves

X-rays

Microwaves

All of these

Unit of decay constantλ is:

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ms

m^-1

m

S^-1

In self induction A coil is connected in__________ with battery and a rheostat.

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Parallel

Series

Both A and B

None of above

A rheostat can be used as variable resistor as well as a-------------

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Potential divider

Current divider

Wheat stone bridge

Power divider

Which one of the following paved the way for modern physics

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Newtonian mechanics

Theory of relativity

Quantum theory

All of above

During each cycle A.C. voltage reaches a peak value.

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Once

Twice

Thrice

Four time

Which one of the following bulbs has the least resistance.

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100 W

200 W

500 W

1000 W

Sensitivity of a galvanometer can be increased by

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Decreasing the value of torsional couple

Decreasing number of turns

Decreasing area of plane of coil

Decreasing magnetic field

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