Question # 1

Which of the following forces is responsible for SHM

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Applied force

Restoring force

Fractional force

Elastic force

If a 40 watt light bulb burns for 2 hours. how much heat is generated

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288 x 10³J

288 x 10⁸J

288 x 10⁵J

288 x 10⁶J

At constant temperature, on increasing the pressure of a gas by 5%, its volume. The final temperature of the gas will be

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81 K

355 K

627 K

627°C

When certain area A is held parallel to the field lines, then:

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No lines cross this area

Maximum lines pass through this area

The number of lines are between zero and maximum

Both (A) and (B) correct

None of these

The force acting on a charge moving in a magnetic field

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is perpendicular to the both magnetic field and direction of motion

is proportional to the magnetic of charges

vanishes when the motion is directly opposite to the direction of field

all of the above

In a straight current carrying conductor, the direction of magnetic field can be found by

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right hand rule

left hand rule

head to tall rule

none of these

The charge carriers in gases are

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electrons

ions

protons

ions and electrons

The internal energy of an ideal gas system is generally the

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translational K.E of molecules

vibrational K.E of molecules

rotational K.E of molecules

all of them

The density of blood is nearly equal to that of

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mercury

sodium

water

honey

The maximum displacement of a body on either side of its equilibrium position is called

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frequency

amplitude

displacement

time period

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

The typical speed of has working aunt is

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0.1 ms^-1

0.01 ms^-1

0.001 ms^-1

0.025 ms^-1

The technological uses of superconductors are

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MRI

Magnetic levitation trains

Faster computer chips

All of them

Light and heavy bodies have equal K.E, then which one has greater momentum

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The heavy body

The light body

Both

Cannot be said

In the thin film, the path difference between the two reflecting waves depends upon

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thickness of film

nature of film

angle of incidence

all of them

In a uniform circular motion of a particle, the direction changes but not its

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Angular displacement

Magnitude of velocity

Force towards centre

b and c

The magnitudes of vectors A.B and C are 3,4 and 5 units respectively.If A + B = C the angle between A and B is:

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π/2

cos^-1 0.6

tan^-1 7/5

π/4

The efficiency of carnot's engine can never be 1 or 100% unless cold reservoir is

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100 K

1 K°

0 K°

None of these

In which of the following, Doppler’s effect is not applicable?

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To find speed of satellite

To find objects under water

To find speed of star

To tune a musical instrument

Multimode step index fibre has a core of relatively larger diameter such is

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125 μm

175 μm

50 μm

100 μm

A ray of light passing from a rarer to a denser medium

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Bends towards normal

Bends away from normal

Suffers no change in direction

None of these

The charged nucleus of an atom itself spins its magnetic field is

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Equal to the field produced by orbital electrons

Greater than the field produced by orbital electrons

Much weaker than the field produced by orbital electrons

Very strong

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