Question # 1

A conducting wire is drawn to double its length. Final resistivity of the material will be

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Double of the original one

Half of the original one

One fourth of the original one

Same as original one

When force and displacement are perpendicular to each other than work is equal to

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Unity

Infinity

Zero

-Fd

When a body is vibrating, the displacement from mean position

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Increases with time

Decreases with time

Changes with time

None of these

An emf is set up in a conductor when it

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Is kept in a magnetic field

Is kept in an electric field

Moves across a magnetic field

Both A and B

None of these

The nature of thermal radiation is similar to:

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Ultraviolet rays

Light rays

Both of them

None of these

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

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500°C

900°C

1100°C

1300°C

When the object lies between F and 2F, the image formed by is formed at:

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Real

Virtual

Diminished

Erect

A force of 5 n is acting Y-axis. Its component along X-axis is:

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7 N

5 N

Zero

10 N

The basic circuit elements of A.C circuit are

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Resistor

Inductor

Capacitor

All the three

A dirty carpet is to be cleaned by heating. This is an accordance with____ law of motion:

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First

Second

Third

None of these

What is the coefficient of mutual inductance, when the magnetic flux changes by 2 X 10^-2Wb, and change in current is 0.01 A?

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2 H

3 H

1/2 H

Zero

A boy is dropped from a tower with zero velocity, reaches ground in 4s. The height of the tower is about

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80 m

20 m

160 m

40 m

The correct unit of power is

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Kilowatt

Dynes

Joule

Kilowatt-hour

An ordinary glass gradually softens into a paste-like state before it becomes a very viscous liquid. It happens almost at:

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800°C

500°C

300°C

100°C

None of these

A polaroid is:

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An adjustable shutter

A device used to analyze polarized light

A device used in polarimeter

A light filter

The fusion of hydrogen into helium is more likely to take place:

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At high temperature and high pressure

At high temperature and low pressure

At low temperature and low pressure

At low temperature and high pressure

Hysteresis is the loop in which the material is magnetized and its curve never pass through

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The same line

One side of origin

Origin

None of these

One second = ______.

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31 x 10^-8years

3.1 x 10⁸years

3.1 x 10^-8years

3.1 x 10^-18years

The energy required to charge a capacitor of 5 μF by connecting D.C source of 20 kV is

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10 kJ

5 kJ

2 KJ

1 kJ

The work done in taking a particle from the floor to a table depends on

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The actual path taken

The time taken in this work

The speed of the particle

The height of the table

Due to dispersion effects, white light source is useful for

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Long distance

Short distance

Very long distances

None of these

According to Huygen,every point on a wavefront may be regarded as a.........of secondary wavelets.

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Base

Source

Producer

Origin

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