Question # 1

Eddy current is produced when:

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A metal is kept in varying magnetic field

A metal is kept in steady magnetic field

A circular coil is placed in a steady magnetic field

A current is passed through a circular coil

The electric field lines start from

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Positive charge

Negative charge

Either A or B

Neutron

An atom

Which one is the least multiple:

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Pico

Femto

Nano

Atto

γ-rays behave like a particle because they explain the

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Compton effect

Photoelectric effect

Pair-production

all the above

With the propagation of a longitudinal wave through a material medium, the quantities transmitted in the propagation direction are

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Energy, momentum and mass

Energy

Energy and mass

Energy and linear momentum

The artillery shells travel along parabolic paths under the influence of

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magnetic field

electric field

electromagnetic field

gravitational field

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

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3

2

6

5

In half wave rectification

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both halves of the input voltage is used

only one half of the input voltage is used

either of these

none of these

Lead, copper and wrought iron are examples of

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brittle substances

ductile substances

plastic substances

elastic substances

When a charged particle passes through matter, it produces ionization, this effect is used in

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fission reaction

reactor

radiation detector

fusion reaction

Acceleration of body executing SHM is always directed towards

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Extreme position

Mean position

Along the direction of motion

None

Dolphins have bodies to assist their movement in water are

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Irregular bodies

Closer to streamline body

Stream lined bodies

None of these

The turning effect of a force is called:

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Acceleration

Torque

Velocity

Momentum

When heat is added to the system, the entropy change is:

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Positive

Negative

Zero

None of these

With the increase of temperature viscosity

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Increase

Decrease

Remains same

Doubles

Travel time of light from sun to earth is

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8 hours 20 minutes

8 minutes 20 seconds

1 minutes 20 seconds

5 hour 20 seconds

The body is in equilibrium when it is in a state of

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Accelerated motion

Uniform motion

Rest or uniform motion

None of these

The photoelectric effect was explained by:

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Einstein

Davison

Hertz

Planck

The maximum kinetic energy of emitted photoelectrons depends upon:

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The intensity of incident light

Frequency of incident light

Metal surface

Both frequency of incident light and metal surface

A wider objective and the use of blue light of short wavelength produces

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Interference

Diffraction

Less diffraction

Polarization

Modulus elasticity of any materiel is of the order of:

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10⁵

10²

10^-2

10^-5

10^-10

In the absence of any force acting on a body

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its momentum changes with distance

its momentum is conserved

its momentum is not conserved

its momentum changes with time

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