Question # 1

Two electric bulbs of 200 W and 100 W have same voltage.If R1 and R2 be their resistance respectively then

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R₁ = 2R₂

R₂ = 2R₁

R₂ = 4R₁

R₁ = 4R₂

If in a moving coil galvanometer a current 1 produces a deflection θ then

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i ∞ tan θ

i ∞ θ²

i ∞ θ

i ∞ √θ

At 0° K which of the following properties of a gas will be zero?

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Kinetic energy

Potential energy

Vibrational enegy

Density

The part of a transistor which is heavily doped to produce large number of majority carriers is

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Emitter

Base

Collector

Any of the above depending on nature of transistor.

Two point charge +3μC and +8μC repel each other with a force of 40 N. if a charge of -5μC is added to each of them then the force between will become

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-10N

+10N

+20N

-20N

The frequency of the incident light falling on a photosensitive metal plate is doubled the kinetic energy of the emitted photoelectrons is

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Double the earlier value

Unchanged

More than doubled

Less than doubled

Which of the following is a scalar quantity

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Density

Displacement

Torque

Weight

The de broglie wave corresponding to a particle of mass m and velocity v has a wavelength associated with it

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h/mv

hm v

mh/v

m/hv

What remains constant in the field of central force?

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Potential energy

Kinetic energy

Angular momentum

Linear momentum

The average binding energy of a nucleon inside an atomic nucleus is about

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8 MeV

8 eV

8 Joules

8 ergs

The essential distinction between X-rays and y-rays is that

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y-rays have smaller wavelength than X-rays

y-rays emanate from nucleus while X-rays emanate from outer part of the atom

y-rays have greater ionizing power than X-rays

y-rays are more penetrating than X-rays

One cannot see fog because

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Fog absorbs light

The refractive index of fog is infinity

Light suffers total reflection at the droplet in a fog

Light is scattered by the droplet in fog

If the dot product of two non-zero vectors vanishes, the vectors will be

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In the same direction

Opposite to each other

Perpendicular to each other

Zero

The unit of electric current 'ampere' is the amount of current flowing through each of two parallel wires 1 m apart and of infinite length will give rise to a force between them equal to

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1 N/m

2 x 10^-7N/m

1 x 10^-2N/m

4 x 10²N/m

If the amplitude of sound is doubled and the frequency reduced to one-fourth, the intensity of sound at the same point will be

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Increasing by a factor of 2

Decreasing by a factor of 2

Decreasing by a factor of 4

Unchanged

Which of the following particles would experience the largest magnetic force when projected with the same velocity perpendicular to a magnetic field?

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Proton

Electron

He⁺

Li⁺

In Which case does the potential energy decreases?

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On compressing a spring

On stretching a spring

One moving a body against gravitational force

One the rising of an air bubble in water

Boyle's law is applicable in

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Isochoric process

Isothermal process

Isobaric process

Isotonic process

In which of the following states does the incandescent substance give continuous spectrum?

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Vapours in atomic state

Vapours in molecular state

Solid or fluid in bulk state

Solid or fluid in plasma state

Which quantity is increased in step-down transformer?

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Current

Voltage

Power

Frequency

A bullet is shot from a rifle. As a result the rifle recoils. The kinetic energy of rifle as compared to that of bullet is

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Less

Greater

Equal

Cannot be concluded

The primary winding of transformer has 500 turns whereas its secondary has 5000 turns. The primary is connected to an a.c. supply of 20 V, 50 Hz. The secondary will have an output of

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200V, 50 Hz

2V, 50 Hz

200V, 500 Hz

2V, 5 Hz

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