Question # 1

Due to relative motion of observer and the frame of reference of events, time always:

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Dilates itself

Contracts itself

Stretches itself

Both (A) and (C)

None of these

Direction of angular momentum is determined by:

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Right hand rule

Head to tail rule

Left hand rule

None of them

Consider a photon of continuous X-ray and a photon of characteristics X-ray of same wavelength. Which of the following is/are different for the two photons

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Frequency

Penetrating power

Energy

Method of creation

A meter wire carraying a current of 2A is at right angle to the uniform magnetic field of 0.5 Weber/m²The force on the wire is

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5N

4N

1.5N

6N

The terms phase difference and path difference are:

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Same

Different

Equal

None of these

Mass of neutron is

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1.67 x 10^-31kg

1.67 x 10^-27kg

9.1 x 10^-31kg

1.67 x 10^-19kg

A piece of fuse wire melts when a current of 15 ampere flows through it. With this current. If it dissipates 22.5 W, the resistance of fuse wire will be

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Zero

10Ω

1Ω

0.10Ω

A process which can be retraced in exactly reverse order, without producing any change in the surroundings is called

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reversible process

irreversible process

any one of them

none of them

The charged nucleus of an atom itself spins its magnetic field

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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

none of these

When velocity of moving body is doubled, the quantity which is also doubled is its:

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K.E.

Acceleration

Momentum

P.E.

Distance to nearest galaxy from earth is

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10¹⁰m

10¹⁵m

10⁴⁰m

10³⁰m

When an atom is isolated, it energy levels are

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Distinct

Very close

Very very close

None of these

The direction of torque is

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Along F

Along r

Perpendicular plant formed by F and r

None of these

When an atom is surrounded by large number of atoms their the energy levels are

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Distinct

Very close

Energy band

None of these

A sonar depth finder in a boat uses sound signals to determine the depth of water. Fourseconds after the sound leaves the boat it returns to the boat because of reflection fromthe bottom. Assume the speed of sound in water is 1,460 meters per second. The depth of the water is, in meters, :

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2,200

4,800

4,400

2,920

Such substances which break soon after they cross elastic limit is called

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Weak substance

Ductile substance

Brittle substance

Organic substance

Sharks due to their special organs, the "ampulae of lorenzini due to which they can detect the potential difference and can locate their prey very precisely of the order of

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Volt

Milli volt

Micro volt

Nano volt

Two sources of light are said to be coherent when the waves produced by them have

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Equal wavelength

Equal amplitude

Equal wavelength and constant phase difference

Amplitude and wavelength are same

A particle is moving in a circle with uniform speed v.In moving from a point to another diametrically opposite point.

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The momentum changes by mv

The momentum changes by 2mv

The kinetic energy changes by (1/2) mv²

The kinetic energy changes by mv²

Whenever high magnification is desired

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A telescope is used

A compound microscope is used

A microscope is used

None of these

The speed of sound in air is

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320 ms^-1

323 ms^-1

330 ms^-1

333 ms^-1

Moment of inertia does not depend upon

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Angular velocity

Mass

Position of axis of rotation

None of these

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