Question # 1

Coulomb's force between two point charges depends upon

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Magnitude of charges

Distance between them

Medium in which they are located

All of the above

In magnet-coil experiment, emf can be produced by:

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Keeping the coil stationary and moving the magnet

Keeping the magnet stationary and moving the coil

Relative motion of the loop and magnet

Any one of above

All above

An compared to solid matter, a crack or an air bubble allows:

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Great amount of X-rays to pass

Smallast amount of X-rays to pass

Very samall amount of X-rays to pass

Any of these

None of these

At ordinary temperature, an increase in temperature increases the conductivity of

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Conductor

Semiconductor

Insulator

Alloy

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

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100 J

1.6 x 10^-17J

100 eV

1.6 x 10^-17eV

The ratio of the r.m.s value of the applied voltage to the r.m.s value of resulting a.c. is

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Impedance

Inductance

Reactance

Resistance

The rate change of area expressed is expressed in:

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m²s^-1

ms^-2

m²s^-2

ms^-1

None of these

A swing has

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one natural frequency

two natural frequencies

three natural frequencies

four natural frequencies

Melting point of ice

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Increases with increasing pressure

Decreases with increasing pressure

Is independent of pressure

Is proportional to pressure

Magnetic flux and flux density are related by

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Flux density = flux x area

Flux density = flux / area

Flux density = flux - area

None of these

Which of the following does not have the same units:

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Work

Heat

Kinetic energy

Power

The locus of all points in a medium having same phase of vibration is called

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Crest

Trough

Wavelength

Wave-front

The Dimension of Force is

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[MLT^-2]

[MLT²]

[ML²T^-2]

None of these

The angle with the horizontal at which an underwater swimmer will see the setting sun is

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91°

32°

49°

69°

When the velocity of a liquid flowing steadily in a tube increases,its pressure?

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Decreases

Increases

Remains same

Zero

In super conductors, once the current is established it exists

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1 day

30 days

indefinitely

None of these

Keeping in view the Earth surface the value of g on the equator is

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Zero

Minimum

Maximum

None of these

Repeaters are the devices which regenerate the signals and are placed at about

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20 km

30 km

40 km

50 km

If the mass and radius of a planet are doubled, then acceleration due to gravity on its surface will become

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One fourth

One half

Double

Four times

If moon radius 1600 km and g on its surface is 1.6 ms^-2Then the escape velocity on the moon is

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1600 ms^-1

50.6 ms^-1

50.8 ms^-1

2263 ms^-1

A ball is thrown upwards with a velocity of 100 m/s.It will reach the ground after

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10 s

20 s

5 s

40 s

The field of a long bar magnet is like a

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Two pole pieces of magnet

Solenoid

Toroid

None of these

Which of the following statements about angular momentums is correct?

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Angular momentum remains conserved

Angular momentum is the product of moment of inertia and angular velocity

Moment of inertia is directly proportional to angular momentum for constant angular speed

All of these

An electron and proton are placed a distance r apart in air the ratio of the electro static force to gravitational force between them is of the order of

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10³⁷

10³⁸

10³⁹

10⁴⁰

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