Question # 1

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

Two forces of 10N and 8N are applied simultaneously to a body. The maximum value of their resultant is:

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20 N

-2 N

18 N

36 N

When a nucleus emits an alpha particles, its charge number decreases by

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3

2

6

5

If there identical strings each of constant K are hooked together the spring constant of resultant spring will be:

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3 K

2 K

K/4

K/3

Silicon can be obtained from

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Lead

Uranium

An isotope of oxygen

Sand

The phase at the positive peak of an A.C. cycle is:

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0º

90º

180º

0 andᏘ

Ꮨ/2 and 3Ꮨ/2

Smaller the damping, the resonance will be

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more flat

more sharp

both of them

none of them

Sadi carnot described an ideal heat engine in

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1820

1840

1860

1880

The magnitude of the force producing an acceleration of 10 m/sec2 in a body of mass 500 grams is:

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3 N

4 N

5 N

6 N

Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length

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X-rays

Ultraviolet rays

y-rays

Cosmic rays

Crystal of germanium or silicon in its pure form at absolute zero acts as:

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A conductor

A semiconductor

an insulator

Both (A) and (C)

Both (A) and (B)

At what point/points in its path does a projectile have it minimum speed

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At the point of projection

At maximum height

All the point where it strikes the ground

None of these

The phenomenon of geothermal energy is a geyser. It is a hot spring that discharges

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Steam

Hot water

Both

None of these

Steradian is a unit of

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Radius

Plane angle

Solid angle

None of these

A motorist travels A to B at a speed at 40 km/h and returns at speed of 60 km/h.His average speed will be.

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40 km/h

48 km/h

50 km/h

60 km/h

The high blood pressure is known as

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Diastolic

Systolic

High blood pressure

None of these

Satellites are objects that orbit around the

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Sun

Planet

Earth

None of these

Which of the following statements correctly describes the properties of two forces acting as a couple

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Equal, parallel and collinear

Unequal, anti-parallel and no-collinear

Unequal, anti-parallel and collinear

Equal, anti-parallel and non-collinear

The angular momentum of a particle is given as

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L = m × p

L = p × V

L = r × p

None of these

For the conversion of heat into work, the two bodies are essential as temperature which is

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Similar

Very little difference

Large difference

None of these

The weight of man is an elevator descending down with an acceleration of 9.8 ms^-2will become

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Half

Double

Unchanged

Zero

How many types of charges are ?

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One type

Two types

Three types

None of these

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