Question # 1

When two waves with same frequency and constant phase difference phase difference interfere

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There is a gain of energy

There is a loss of energy

The energy is redistributed and the distribution changes with time

The energy is redistributed and the distribution remains constant with time

The flow of an ideal fluid is

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streamline flow

incompressible flow

non-viscous

all of the above

Solar cell converts sunlight directly into

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potential energy

thermal energy

mechanical energy

electrical energy

N s m^-2is unit of:

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Drag force

Pressure

Surface tension

Coefficient of viscosity

The number of vibrations in two seconds can be expressed as______if frequency of vibration is f.

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f

2 f

3 f

1/2 f

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10^-15is

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9 x 10⁵V

9 V

8 x 10⁶V

80 V

The product of induced current and the resistance of the wire through which the current is passing is called:

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Electromagnetic induction

induced emf

Induced current

Self induced

None of these

The SI unit of magnetic flux is.

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weber

Nm^-1A^-1

tesla

gauss

The Nobel Prize on the explanation of photoelectric effect was awarded to:

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Max. Planck

Maxwell

Bohr

Rutherford

None of these

The earth's potential is taken as

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Negative

Positive

Zero

Infinite

If a wave can be polarized, it must be

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An electromagnetic wave

A longitudinal wave

A progressive wave

A transverse wave

Experimental demonstration of wave nature of light was given in 1801 by

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New ton

Maxwell

Thomas young

Huygen

Earth receivers huge amount of energy directly from

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Water

Moon

Sun

None of these

Layer of oil on water in sunlight appears coloured due to

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diffraction of light

dispersion

interference of light

polarization of light

When the velocity of a body is increasing, the acceleration produced is

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No acceleration produced

Negative acceleration

Positive acceleration

None of these

The wavefront formed at very large distance from the source is:

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Cylindrical

Spherical

Elliptical

Plane

The relation between displacement of the mirror 'L' and wavelength λ of the light used

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L = 2mλ

L = λ/2m

L = mλ/2

None of these

Which of the following is the only vector quantity

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Temperature

Energy

Power

Momentum

Angular momentum has the same unit as

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Impulse x distance

Linear momentum x time

Work x frequency

Power x time

The total change in momentum of the isolated two ball system is

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Maximum

Minimum

Zero

None of these

The ratio of size of the image to the size of the object is called

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Resolving power

Magnification

Power

None of these

The stopping potential for a certain metal is 10 volt, the max. Energy of emitted electron is:

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10 J

100 J

1.6 × 10-18 J

1.6 × 10-19 J

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