Question # 1

An LED emits light when it is:

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Forward biased

Reverse biased

Operated without battery

Operated with heat source

None of these

The band above the valence band is called

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high energy band

conduction band

empty band

none of them

Formula for calculating moment of inertia of the bodies of one pair is same. Tick the answer.

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Disc, sphere

sphere, hoop

Thin rod, hoop

Hoop,disc

The range ofβ-particle in air is greater than that ofα-particle by

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1000 times

100 times

15 times

10 times

SI unit of frequency is

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second

hertz

revolution

vibrations/sec

When quarter of a cycle is completed, the phase of vibration is:

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90°

180°

45°

360°

In radio-active decay, the original element which disintegrate to another element is called

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element

daughter element

parent element

none of these

A.C. can be measure with the help of

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Nuclear effect

Magnetic effect

Chemical effect

Heating effect

When a platinum wire is heated, it appears dull red at about

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500°C

900°C

1100°C

1300°C

The vector is space has:

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One Component

Two Compnents

Three Components

Non of these

If the number of turns of a solenoid (carrying a steady current I) is doubled without changing the length of a solenoid, then magnetic field:

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Becomes Half

Becomes double

Is not affected

Becomes one fourth

None of these

Which of the following quantity is expressed as force per unit area?

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Work

Pressure

Volume

Area

With the rise of temperature the amplitude of atoms

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Slow down

Fixed

Increases

None of these

The fringe spacing in case of red light

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Increases

Decreases

Remains the same

None of these

In semiconductors at 0 K the valence band is

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Completely filled

Partially filled

No

Yes

A rocket carries its own fuel in the form of a

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Liquid and oxygen

Solid and oxygen

Both

None of these

The magnitudes of vectors A.B and C are 3,4 and 5 units respectively.If A + B = C the angle between A and B is:

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π/2

cos^-1 0.6

tan^-1 7/5

π/4

The terminal velocity of for a water droplet of radius 10^-5 m is of the order of

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1 cm/s

1 mm/s

1 nm/s

1 μm/s

Which one of the following phenomenon cannot be explained on the bases of Huygen's theory?

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Refraction

Reflection

Diffraction

Formation of spectrum

A collision in which the K.E. is not conserved is called

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Elastic collision

Inelastic collisiion

Both

None of these

In projectile motion when a body is projected upward it must have

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Initial velocity

Angleθ<90°

Falling under gravity

All of these

Two different gases are enclosed in two different vessels at same pressure. If r₁and r₂are their densities then ration of their rms speed is equal to

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