Question # 1

Speed of light in vacuum depends upon:

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Frequency

Wavelength

Amplitude

None of these

X-ray are also known as

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Roentgen rays

Maxwell rays

Plank range

Einstein rays

Which one of the following elasticizes is possessed by fluids:

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Young's elastic modulus (length)

Bulk elastic modulus (volume)

Modulus of rigidity (shape)

None of these

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

Which one of the following is an example of resonance

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swing

tuning a radio

microwave oven

all of them

The velocity of falling raindrops attains limited value because of

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Up thrust of air

Air currents of the earth atmosphere

Surface tension effect

Viscous force exerted by air

In vibrational motion(SHM)

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P.E remains conserved

Average K.E remain constant

Neither P.E nor K.E remains constant

Total energy remains constant

The working of all DC electric meters (galvanometers, ammetersand voltmeters) depends upon

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Heating effect of current

Chemical effect of current

Magnetic effect of current

Electromagnetic effect of current

When the magnitude of two component vectors are equal to that of their resultant, then the angle between the components is:

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60°

90°

120°

150°

Monochromatic light means waves of:

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Same frequency

Same colour

Same wavelength

All of them

When angular acceleration is positive, the body rotates:

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Slower

Slowest

Faster

None of these

The limit up to which the stress is directly proportional to strain is called

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Elastic limit

Proportional limit

Breaking limit

Ultimate tensile limit

The motion of molecules in gases i:

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Orderly

Random

Circular

All of these

The light form Sun reaches earth in the form of

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plane wavefront

circular wavefront

spherical wavefront

elliptical wavefront

The high-tensile steel used to support the roadway of a suspension bridge breaks under a stress of 2 x 10⁹Pa. Find the minimum cross-sectional area for a cable if it is to support a load of mass 2 x 10⁵kg.

(g = 10 N kg^-1)

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10^-2m²

10^-1m²

10^-4m²

10^-3m²

The minimum distance between an object and its image in a convex lens is

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2 f

2.5 f

3 f

3.5 f

In Young's double slit experiment for the interference of light, the central region of the fringe system is

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Bright

Dark

Bright and dark

None of these

When the lift is moving downward with an acceleration 'a' then

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T - W = ma

T = W - ma

T - ma = W

None of these

Using a graded index fibres the time difference is reduced to about

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0.5 ns per km

1.0 ns per km

2.0 ns per km

2.3 ns per km

Torque is a physical quantity which is

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Scalar quantity

Vector quantity

Constant quantity

None of these

A car engine is based on the principle of

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Bernoulli's equation

Verturi relation

Torricelli;s theorem

None of these

When a horse pulls a cart.the force that makes the horse run forward is the force exerted by

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The horse on the ground

The horse on the cart

The ground on the horse

The ground on the cart

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