Question # 1

A semi-conductor in its extremely pure form is known as

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extrinsic semi-conductor

intrinsic semi-conductor

either of them

none of them

An important part of inkjet printer is:

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Toner

Drum

Deflection plates

Heated roles

None of these

The consumption of energy by a 60 W bulb in 2 minutes is:

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2 watt-hour

120 watt-hour

30 watt-hour

None of these

During the upward motion of the projectile, the vertical component of velocity:

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Decreases

Increases

Remains constant

None of these

How much time, theα-particle more massive than an electron

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600

7000

5000

15000

A charge Q is divided into two parts q and Q - q and separated by a distance R. The force of repulsion between them will be maximum when

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q = Q/4

q = Q/2

q = !

None of these

When heat is added into the system then change in entropy is

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negative

positive

zero

any one of them

Two water pipes of diameters 4 cm and 8 cm are connected with a supply line. The velocity of flow of water in the pipe 4 cm diameter is

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1/4 times

4 times

Twice

1/2 of 8 cm diameter pipe

In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is

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Helium

Neon

Both

None of these

A circuit has a resistance of 11Ωan inductive reactance of 25Ωand a capacitance reactance of 18Ω. It is connected to an a.c. source of 200 V and 50 Hz. The current through the circuit (in amperes) is

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11

15

18

20

At the constant temperature, if the value of a given mass of a gas is double, then the density of gas becomes:

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Double

Remains constant

Half

None of these

How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:

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The upper half of the image is cut off

The brightness of the image is reduced

The brightness of the image is increased

No effect at all

A line which represents the direction of travel of a wave is known as:

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Spherical Wavefront

Locus

Ray

Either B or C

Hotness and coldness of an object is represented in terms:

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Heat

Temperature

Chemical energy

None of these

Laplace formula is derived from

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Isothermal change

Adiabatic change

Isobaric change

None of these

While describing the motion of a simple pendulum, the frictional effects are

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taken into account

completely ignored

partially ignored

none of them

For the working of a heat engine, there must be

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a source of heat at high temperature

a sink at low temperature

both of them

none of them

The force applied on unit area to produce any change in the shape, volume or length of a body is known as

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strain

elasticity

stretching

stress

Swimming becomes possible because of______law of motion.

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First

Second

Third

None of these

If rope of lift breaks suddenly. The tension exerted by the surface of lift is (a=Acceleration of lift)

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mg

m (g+a)

m (g - a)

0

Angular momentum is a:

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vector quantity

Imaginary quantity

Complex Quantity

Scalar Quantity

The example of reversible process is

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an explosion

changes occur suddenly

slow compression of a gas

all of them

A diode characteristic curve is a plot between

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current and time

voltage and time

voltage and current

forward voltage and reversed voltage

If the stress increased beyond the elastic limit of the material. the deformation produced in the material will be

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permanent

temporary

either of them

none of them

Find the total displacement of a body in 8 seconds starting from rest with an acceleration of 20 cm/s²

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0.064 m

640 cm

64 cm

64 m

There is no way to detect:

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Absolute uniform motion

Accelerated motion

State rest

State of motion

None of these

A dirty carpet is to be cleaned by heating. This is an accordance with____ law of motion:

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First

Second

Third

None of these

If the values of instantaneous and average velocities are equal, the body is said to be moving with

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uniform acceleration

uniform speed

variable velocity

uniform velocity

A current of 1 ampere is passing through a conductor. The charge passing through it in half a minute s

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One coulomb

0.5 coulomb

30 coulombs

2 coulombs

None of these

G.P. Thomson observer experimentally that electrons and neutrons possess

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particle-like properties

wave-like properties

neither particle nor wave like properties

none of these

The results of mechanical tests are usually expressed in terms of

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stress

strain

stress and strain

neither strees nor strain

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