Question # 1

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

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3

24

126

200

Faraday's law of electromagnetic induction has been used in the construction of:

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Galvanometer

Voltmeter

Electric motor

Electric genrator

Commutator

The resistance of an incandescent lamp is

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Smaller when switched on

Greater when switched off

The same whether it is switch off or switch on

Greater when switched on

A virtual image is formed when object is placed:

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Within focal length of a convex lens

Near the focal point of a concave lens

Both A and B

Away from 2F of a convex lens

An ordinary glass gradually softens into a 'paste -like' state before it becomes a very viscous liquid. It happens almost at:

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800^oC

500^oC

300^oC

100^oC

None of these

In stationary waves

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Energy is uniformly distributed

Energy is minimum at nodes and maximum at antinodes

Energy is maximum at nodes and minimum at antidotes

Alternating maximum and minimum energy producing at nodes and antinodes

Which is modified form of galvanometer

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potentiometer

battery

voltmeter

slide wire bridge

Force is a:

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Scalar quantity

Base quantity

Derived quantity

None of these

The resonance will be sharp, if the amplitude decreases rapidly at a frequency

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equal to the resonant frequency

slight different from the resonant frequency

greatly different from the resonant frequency

any one of them

The natural frequency of a pendulum which is vibrating freely, depends upon its

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mass

length

material

all of them

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

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Kinetic energy

Potential energy

Vibrational energy

Density

In a _____ flow, each particle of the fluid is called a streamline and different streamlines ______cross each other.

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Streamline, cannot

Turbulent, cannot

Streamline, can

None of these

After alpha decay the atomic number of the atom

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increase by four

decreases by two

increases by two

decrease by four

1 gm-cm^-3is equal to:

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10³kg-m^-3

10^-3kg-m^-3

1 kg-m^-3

10⁶kg-m^-1

Lyman series in the spectrum of hydrogen exists in the :

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Infra-red region

Visible region

Ultraviolet region

Both(A) and (B)

None of these

The resistance of a conductor does not depend on its

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mass

resistivity

length

cross-sectional area

The length of rotating vector (on a certain scale) represents the:

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Peak value of alternating quantity

RMS value of alternating quantity

Instantaneous value of alternating quantity

Either (B) or (C)

Either (A) or (B)

When a mass 'm' is pulled slowly, the spring stretches by an amount x_o, then the work done will be

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W=Kx_o

W=1/2Kx_o

W=1/2Kx²_o

W=4Kx_o

The induced current in the loop can be Increased by

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Using a stronger magnetic field

Moving the loop faster

Replacing the loop by a coil of many turns

All above

Both A and B

The example of reversible process is

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an explosion

changes occur suddenly

slow compression of a gas

all of them

When heat is removed from the system

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negative

positive

zero

any one of them

Energy required by an electron revolving in certain orbit to jump to an excited state is called:

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Ionization energy

Ionization potential

Excitation energy

Excitation potential

None of these

Which of the following is scalar quantity?

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Electric potential

Velocity

Momentum

Force

Energy stored in the spring of a watch is called

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Potential energy

Kinetic energy

Nuclear energy

Elastic potential

According to Stoke's law, drag force depends on

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Initial velocity

Final velocity

Terminal velocity

Instantaneous velocity

One coulomb of charge is created by

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10 electrons

1.6 x 10^-19electrons

6.25 x 10¹⁸electrons

6.25 x 10²¹electrons

The special theory of relativity treats problems invoving

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inertial frame of references

accelerating frame of references

both of these

none of these

The induced current in a conductor depends upon:

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Resistance of the loop

Speed with which the conductor moves

Any of these

Both A and B

None of these

When a constant potential difference is applied across the conductor, the drift velocity of electrons:

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Increases

Decreases

Remains the constant

Either of these

None of these

When a suitable small resistance is put in parallel with the galvanometer coil, it is converted into

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Voltmeter

Avometer

Ammeter

None of these

The CRO deflects the beam of electrons, when they passes through uniform

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electric field

gravitational field

magnetic flax

magnetic field

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