Question # 1

The radius of 10th orbit in hydrogen atom is.

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0.053 nm

0.53 nm

5.3 nm

53 nm

A block body is an ideal:

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Absorber

Radiator

Both a & b

None of above

The principle regarding the dual nature of light was first discovered by

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Compton

J.J.Thomson

De-Broglie

Heisenberg

The powers of two electric bulbs are 100w and 200w. Which are connected to power supply of 220 V. The ratio of resistance of their filament will be:

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1:2

2:1

1:3

4:3

The particles which do not experience strong force are called.

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Baryons

Hadrons

Mesons

Laptons

The curie temp for iron is about

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800^oC

740^oC

750^oC

650^oC

The charge of an alpha particle is equal to

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-e

+e

-2e

2e

The dimension of stress is

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[MLT^-1]

[ML^-1T]

[ML^-1T^-1]

[ML^-1T^-2]

The quantity time constant RC has units of.

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Charge

Time

Capacitance

Resistance

Electron vibrating 94,000 times each second will produce radio waves of frequency.

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94 Hz

940 HZ

94 Hz

490 Hz

Bottom quark carries charge :

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2/3 e

-2/3 e

+1/3 e

-1 /3 e

106 electrons are moving through a wire per second the current developed is:

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1.6 x 10-19 A

1 A

1.6 x 10-13A

106 A

Which is not true for X rays

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X rays are not defected by electric field

X rays are polarized

X rays consist of electromagnetic waves

X rays can be diffracted by grating

The domain theory of magnet is important to explain the behaviour of

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Diamagnets

Paramagnets

Ferromagnets

All of these

The number of lines per unit area passing perpendicular through an area is called

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Flux

Electric intensity

Both (a) , (b)

None of these

In glass, molecules are irregularly arranged so it is known as.

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Solid

Liquid

Solid liquid

Gas

the number of terminals in a semiconductor diode are

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2

3

4

5

In pure capacitor A.C. circuit, the current I and charge q are.

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In phase

Out of phase

Parallel to each other

None of above

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