Question # 1

What is frequency of radio waves transmitted by a station, if the wavelength of those waves is 300 m?

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1 MHz

10 Hz

1 GHz

100000 Hz

Electric field strength is defined as

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Work done on unit charge

Force exerted on unit charge

Distance covered by unit charge

Power exerted by unit charge

None of these

Battery is charged in motor cars, which is based on

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Chemical effect

Magnetic effect

Electric effect

None

The liquid which conduct current is known as

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heating effect

chemical energy

electrolyte

ohm's law

The path (or trajectory) described by a projectile is

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a parabola

a hyperbola

a circle

a straight line

A container has a small hole in the bottom. Air can go through this hole,but water cannot. This can be best explained by the statement that

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water contains hydrogen atoms, air does not

water molecules are smaller than molecules in the air

surface tension of the water prevents it from

Two copper balls of 1 cm and 2 cm in diameter are simultaneously dropped in the same viscous medium. The terminal velocity of bigger ball is:

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Not affected due to its size

Twice that of small size ball

Four times that of small size ball

1/4th of that of small size ball

A process in which no heat enters or leaves the system is called

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isochoric process

isothermal process

adiabatic process

none of them

If current through conductor is 1 A and length of conductor is 1m placed at right angle to the magnetic field, then the strength of magnetic field is

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F = B²

F = 0

F = B

F = B/2

Which one of the following can act approximately as a source of monochromatic light;

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Neon lamp

Fluorescent tube

Sodium lamp

None of these

The size of the domain is such that they can contain

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10²to 10⁴atoms

10⁴ to 10⁸atoms

10⁸to 10¹²atoms

10¹²to 10¹⁶atoms

In order to increase the K.E of ejected photo electrons, there should be an increase in:

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Intensity of radiation

NoneI

Frequency of radiation

Both (b) & (c)

Moment of inertia does not depend upon

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Angular velocity

Mass

Position of axis of rotation

None of these

Whenever a body moves from one position to another, the change in its position is called

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Motion

Displacement

Distance

None of these

When a body movies in a circle in the counter clockwise direction the angular displacement Δθ is taken as

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Positive

Negative

Both ways

None of these

A simple astronomical telescope consists of

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Two convex lenses

Three convex and one cocave

Two concave lens

None of these

A human eye can detect the electromagnetic radiations of the type:

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Infrared radiations

For- infrared radiations

X-rays radiations

Red radiations

When the velocity of a body is increasing, the acceleration produced is

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No acceleration produced

Negative acceleration

Positive acceleration

None of these

When crest of one wave falls on the crest of the other wave. This phenomenon is known as:

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Destructive interference

Diffraction

Polarization

Constructive interference

In the doping process, the ratio of the doping atoms to the semi-conductor atom is

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1 to 10

1 to 10³

1 to 10⁶

1 to 10⁹

A body will be in complete equilibrium, if

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any one of them

both of them

The fundamental unit which has same power in the dimensional formula of surface tension and viscosity is:

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Mass

Length

Time

None

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