Question # 1

Magnetic effect of current is used:

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In electric motor

To detect current

To measure current

All of these

None of these

The obvious effect/s of current is/are:

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Heating effect

Magnetic effect

Chemical effect

Both (C) and (B)

All of these

When two objects come to common temperature, the body is said to be in:

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Static equilibrium

Dynamic equilibrium

Thermal equilibrium

None of these

In crystalline solids, atoms are held about their equilibrium positions depending upon the strength of:

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Adhesive force

Nuclear forces

Inter atomic cohesive force

Electromagnetic force

None of these

The number of "Earth Stations" which transmit signals to satellites and receive signals fro them are

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3

24

126

200

A succession of events which bring the system back to its initial condition is called

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reversible process

irreversible process

a cycle

none of them

An irreversible heat flow from a hot to cold substances of a system, causes the disorder to

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decrease

remains the same

increase

any one of them

During the projectile motion, the horizontal component of velocity

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changes with time

remains constant

becomes zero

decreases with time

The waves produced in a microwave oven have wavelength.

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12 mm

12 cm

12 m

12 mm

Matter is made up of very tiny particles called

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Atoms

Molecules

Ions

None of these

A 1000 Kg car travelling with a speed of 90 km/hr turns around a curve of radius 0.1 km. The necessary centripetal force comes out to be:

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8.1 X 10⁷N

625 N

6250 N

None of these

A hollow insulated conduction sphere is given a positive charge of 10μC.What will be the electric field at the centre of the sphere if its radius is 2 meters?

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Zero

5μC m^-2

20μC m^-2

8μC m^-2

How many types of charges are ?

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One type

Two types

Three types

None of these

The magnitude of the scalar product can also written as

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Magnitude of vector and effective component of vector

Vector and effective component of vector

Vector and perpendicular component of vice vector

None of these

The magnitude of work is

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W = Fd cos θ

W = Fd

W = dF cos θ

All of these

An alpha particle is accelerated through a potential difference of 10⁶ volt.Its kinetic energy will be.

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1 MeV

2 MeV

4 MeV

8 MeV

Two circular rings have their masses in the ratio 1 : 2 and diameter in ratio 2 : 1 the ratio of their moment of inertia is

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1:4

4:1

2:1

√2:1

In case of uniform circular motion which of the following physical quantity do not remain constant?

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Speed

Momentum

Kinetic energy

Mass

For a gas obeying Boyle's law, if the pressure is doubled the volume becomes:

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One half

Double

Four times

None of these

The valency of electron in the valence band is known as

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Atom

Molecule

Hole

None of these

The curie temperature of iron is

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600 C^o

650 C^o

700 C^o

750 C^o

Which of the following have maximum ionization power?

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𝛼 −rays

𝛽 −rays

𝛾 −rays

Same for all

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