Question # 1

A potential barrier of 0.7 V exists across p-n junction made from:

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Germanium

Silicon

Arsenic

Gallium

Indium

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)

When small number of atoms from some other suitable element is added to the semi-conductor material, then this process is known as

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impurification

adding

doping

extrinsivity

A vector which has magnitude 'one' is called:

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Resultant vector

A unit vector

Position vector

None of these

In a three phase a.c. generator, there are

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2 coils

3 coils

1 coild

No coil

A car is turning around a corner at 10 m/sec as it travels along an arc of a circle. If value of centripetal acceleration is 10 m/sec²in this case, find radius of the circular path:

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1 m

5 m

10 m

15 m

What temperature is the same on Celsius scale as well as on Fahrenheit scale?

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32°C

-32°C

-40°C

-212°C

The SI unit of current is

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watt

coulomb

volt

ampere

The bob of a simple pendulum is suspended by

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string

heavy inextensible string

light extensible string

light inextensible string

Radium was discovered by:

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Becquerel

Marie curie

Pierre curie

Rutherford

Both (B) and (C)

It two waves of amplitude 'a' produce a resultant wave of amplitude a, then the phase difference between them will be

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60°

90°

120°

180°

A material most suitable to make the permanent magnet are

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High retentivity

Large coercive current

Small domain friction

a and b

Successive dark and bright fringes are formed each time the moveable mirror in Michelsion's interferometer is moved a distance

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λ/2

λ/4

λ

3/2λ

In Newton's rings the thickness of air film at the point of contact is

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maximum

minimum

equal to wavelength

zero

When torque acting upon a system is zero which of the following will be constant?

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Force

Linear momentum

Linear impluse

None of these

A spinning cricket ball suffers

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An extra height

An extra velocity

An extra curvature

None of these

A fighter plane is chasing another plane,when it opens fire its speed

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Increases

Decreases

Remains constant

Its stops

Inertial mass and gravitational mass are

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opposite

identical

identical when there is no friction

all of them

As this temperature scale is independent of the working substance, therefore can be applied at

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High temperature

Low temperature

Very low temperature

None of these

If the line of action of force F passed through the axis of rotation or origin then its torque is

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Maximum

Minimum

Zero

None of these

The study of fluids is relatively complicated, this can be simplified by using

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Law of conservation of energy

Law of conservation of mass

Law of conservation of momentum

a and b

In YDS experiment, if the distance between the slits and also the distance between slits and screen is doubled, the fringe width:

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Becomes doubled

Becomes 4 times

Is halved

Remains the same

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