Question # 1

A resistance used in galvanometer to make it voltmeter is called

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shunt resistance

high resistance

zero resistance

none of these

Which of the following types of force can do no work on the particle on which it acts

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Frictional force

Gravitational force

Electric force

Centripetal force

When a silicon crystal is doped with a pentavalent element, then the atom of the pentavalent element is known as

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acceptor

donor

either of them

none of them

The closed loop gain of the inverting amplifier is written as

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G = R₂/R₁

G = 1 + R₂/R₁

G = -R₂/R₁

G = 1 - R₂/R₁

The flux through a closed surface depends upon:

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Shape of geometry of the closed surface

Charge enclosed

Nature of the medium

Both (A) and (B)

Both (B) and (C)

A condenser of capacity 50μF is charged to 10 V.The energy stored is

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1.25 x 10^-3J

3.75 x 10^-3J

2.5 x 10^-3J

5 x 10^-3J

Which of the following diode is used for the detection of light

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photo diode

light emitting diode

photo voltaic cell

all of them

The number of "Earth stations" which transmit signals to satellites and receive signals from them are:

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3

24

126

200

According to Rutherford atomic model, the positive charge in an atom

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is concentrated at its centre

is in the form of positive electron at same distance from its centre

is spread uniformly through its volume

none of these

If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be

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5μF

20μF

10μF

15μF

The range ofβ-particle in air is greater than that ofα-particle by

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1000 times

100 times

15 times

10 times

The viscosity of liquid is due to

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Adhesive force

Cohesive force

Gravitational force

Diffusion

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 = Q

None of these

The dimensions of power are

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[ML²T²]

[ML²T^-2]

[ML²T^-3]

[M²LT^-3]

The food which we eat in three days produces energy equal to energy from ____ liter of petrol

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1

1/3

3

9

Velocity is a physical quantity which is

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Scalar quantity

Vector quantity

Variable quantity

None of these

The critical temperature of lead is

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1.18 K

4.2 K

3.72 K

7.2 K

Which of the following phenomenon cannot take place if we consider light as longitudinal wave?

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diffraction

interference

polarization

reflection

The time taken by the mirror M to rotate through an angle 2π/8 is

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1/8 f

1/16 f

1/4 f

1/2 f

It is a common characteristic of all types of wave motion that

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Particles move up and down

Particles move back and forth

Energy is transferred without the transport of particles

A material medium transmits the disturbance

Absolute zero is considered as that temperature at which:

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All liquids become gases

All gases become liquids

Water freezes

None of these

X-rays is a type of electron magnetic radiations of much shorter wavelengths of the order of

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10^-8 m

10^-9 m

10^-10 m

10^-12 m

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