Question # 1

The pointer of a magnetic compass:

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Is affected only by permanent magnets

Align itself parallel to the applied magnetic field

Vibrates in the magnetic field of the current

Aligns itself perpendicular to the magnetic field

Both (C) and (D)

A device which converts Electrical energy into mechanical energy is called as

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Transformer

Generator

Motor

All of these

The unit of intensity of electric field is

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newton/coluomb

jule/coluomb

volt x metre

newton/metre

An object thrown in arbitrary direction in space with an initial velocity and moving freely under gravity will follow

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a circular path

a straight line

a hyperbola

a parabola

According to the special theory of relativity

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mass and energy are same entities

mass and energy are same entities but interconverible

mass and energy are different entities but interconverible

mass and energy are different entities but non-interconveritble

The SI unit of magnetic permeability is

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WB A^-1m^-1

WB mA^-1

WB Am^-1

None of these

The wave motion set up in any medium depends upon:

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Elasticity

Inertia

Density

All of these

If one of the pipes has a much smaller diameter than the other and are placed horizontally then form both sides of Bernoulli's equation, we can drop the term

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P

1/2 fv²

pgh

none of them

The quantity have dimension of ML²T⁰²will have SI unit of:

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Watt

Newton

Joule

Metre

For a given angle of projection, if the time of flight of a projectile is doubled, the horizontal range will increases to

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Four times

Thrice

Once

Twice

Conversion of alternating current into direct current is called

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amplification

rectification

conduction

polarization

A capacitor of capacity 1 μF is charged to 1 kV.The energy stored in J

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5

0.5

0.005

50

The capacitance of a parallel plate capacitor does not depend upon

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Area of plates

Medium between plates

Distance between plates

Metal of the plates

If plane polarized light is incident on the second sheet of Polaroid, the light emitted is full light when their axes are

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Parallel to each other

Perpendicular to each other

In between two positions

None of these

When a constant force is applied on a body it moves with uniform

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Acceleration

Velocity

Speed

Momentum

The charges are attracted when

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Two charges are alike

Two charges are opposite

All of them

None of these

If the velocity-time graph is a straight line, then it is

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parallel to velocity-time

parallel to time axis

inclined to velocity axis

inclined to time-axis

If two non zero vectors A and B obey the relation |A + B| = |A - B|.then the angle between them is:

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120°

90°

60°

0°

In a Millikan's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10^-19 C.The number of excess electrons on the drop is

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3.9

4

4.2

6

In a uniform circular motion (horizontal) of a ball tied with a string,velocity at any time is at any angle θ is

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θ = 60°

θ = 30°

θ = 90°

None of the above

A person A is going up in a balloon while another person is going down into a mine.Both are measuring the gravitational field.

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The field measured by both A and B goes on increasing.

The field measure by A Increases while the measured by B decreases

The field measured by A decreases while that measured by B decreases

The field measured by A decreases while that measured by B increases

If the magnification M₁ = 20.0 for objective and M₂ = 12.0 then total magnification is

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200

240

260

280

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