Question # 1

Which of the following is most suitable as the core of transformer

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Soft iron

Alinco

Steel

None of these

According to the second law, which is must to produce work

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a source contains a large amount of heat energy

two sources at the same temperature

two sources at the different temperatures

a source contains a small amount of energy

INTELSAT operates at frequencies 4, 6, 11, 14 having unit of:

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KHz

MHz

GHz

BHz

While deriving equation of pressure by kinetic theory of gases, we take into account:

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Only linear motion of molecules

Only rotational motion

Only vibratory motion

All of these

With age, least distance of distinct vision:

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Increases

Decreases

Is not affected

None is correct

The half life of radioactive substances depends upon

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amount of substance

energy of substance

state of substance

temperature of substance

The error may occur due to:

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Negligence

Faulty apparatus

Inappropriate method

all of these

When a stress changes length, it is called the

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compressional stress

tensile stress

shear stress

any one of them

The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at

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100 K

273 K

0 K

-273 K

The terminal velocity of water droplet of radius 1 x 10^-4m and desity 1000 kg m^-3descending through air of viscosity 19 x 10^-6kg. m^-1s^-1is

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2.5 ms^-1

3.2 ms^-1

4.3 ms^-1

1.1 ms^-1

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

If a metallic bob is suspended by a string in the vertical place, it will be in?

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complete equilibrium

translational equilibrium

rotational equilibrium

none of them

In super conductors, once the current is established it exists

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1 day

30 days

indefinitely

None of these

Which of the following is an optically active material

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Solution of cane sugar

Liquid nitrogen

Mercury

Polaroid

The number of seconds in one year are

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3.154 x 10⁶

3.154 x 10⁵

3.154 x 10⁴

3.154 x 10⁷

An object is placed at a distance 18 cm from a convex lens. The image is formed at a distance of 9 cm the focal length of the lens is

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6 cm

9 cm

10 cm

18 cm

If the mass and radius of a planet are doubled, then acceleration due to gravity on its surface will become

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One fourth

One half

Double

Four times

The strain is the ratio of

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Stress/strain

Strain/stress

Force area

change in length/original length

Angular momentum is

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A scalar

A vector

Neither A.nor B.

Either A.or B.

Everything in the vastness of space is in a state of

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Rest

Motion

Perpetual motion

None of these

For incident angles equal or greater than the critical angle the glass air boundary will act as a

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Convex mirror

Concave mirror

Mirror

None if them

The shaft of a motor is rotating at constant angular velocity of 3000 rpm. The angle turned per second is

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100 π rad/s

200 π rad/s

300 π rad/s

400 π rad/s

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