Question # 1

One cannot see fog because

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Fog absorbs light

The refractive index of fog is infinity

Light suffers total reflection at the droplet in a fog

Light is scattered by the droplet in fog

The conductivity of a superconductor is

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Infinite

Very large

Very small

Zero

An object is placed at a distance of f/2 from a convex lens. The image will be

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At one of the foci, virtual and double its size

At, 3f/2, real and inverted

At 2f, virtual and erect

At f, real and inverted

In Which case does the potential energy decreases?

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On compressing a spring

On stretching a spring

One moving a body against gravitational force

One the rising of an air bubble in water

Absolute temperature can be calculated by

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Mean square velocity

Motion of the molecule

Both A and B

None of these

A sun rise or sun set, the sun looks reddish because:

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The sun is coldest at these times

Of the effects of reflection and refraction

The sun is hottest at these times

Of the scattering of light

For production of beats the two sources must have

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Different frequencies and same amplitude

Different frequencies

Different frequencies, same amplitude and same phase

Different frequencies and same phase

A conducting wire is drawn to double its length. Final resistivity of the material will be

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Double of the original one

Half of the original one

One-fourth of the original one

Same as original one

The frequency of the incident light falling on a photosensitive metal plate is doubled, the kinetic energy of the emitted photoelectrons is

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Double the earlier value

Unchanged

More than doubled

Less than doubled

Which one of the following is a simple harmonic motion?

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Wave moving through a string fixed at both ends

Earth spinning about its own axis

Ball bouncing between two rigid vertical walls

Particle moving in a circle with uniform speed

How much water a pump of 2kW can raise in one minute to a height of 10 m, take g = 10 m/s²?

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1000 liters

1200 liters

100 liters

2000 liters

According to Stoke's law, drag force depends on

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Initial velocity

Final velocity

Terminal velocity

Instantaneous velocity

To make the frequency double of an oscillator, we have to

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Double the mass

Half the mass

Quadruple the mass

Reduce the mass to one fourth

In an A.C. circuit, a resistance of R ohm is connected in series with an inductance L. If phase angle between voltage and current be 45°, the value of inductive reactance will be

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R/4

R/2

R

Cannot be found with the given data

A moving charge will gain energy due to the application of

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Electric field

Magnetic field

Both of these

None of these

Two forces of 10N and 15N are acting simultaneously on an object in the same direction. Their resultant is

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Zero

5N

25N

150N

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