Question # 1

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

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100 ev

10⁶e v

10³e v

1.0 e v

The irregular and unsteady flow of the fluid is called

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turbulent flow

steady flow

either of them

both of them

To hear a clear echo, the reflecting surface must be at a minimum distance of

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10 m

16.5 m

33 m

66 m

The work done by a force, keeping an object in circular motion with constant speed is:

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Zero J

1 J

0.1 J

0.01 J

Particles have the mass smallest of following is

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Electron

Proton

Neutron

Quark

The special theory of relativity treats problems invoving

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inertial frame of references

accelerating frame of references

both of these

none of these

The concept of field theory was put forward by

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Franklin

Kepler

Oersted

Michael Faraday

The path described by a projectile is called its

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orbit

trajectory

range

distance

A lift is descending at a constant speed V. A passenger in the lift drops a coin. The acceleration of the coin towards the floor will be

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Zero

g

-g

V + g

If current through conductor is 1 A and length of conductor is 1m placed at right angle to the magnetic field, then the strength of magnetic field is

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F = B²

F = 0

F = B

F = B/2

Spectrum represents the number of component colours present in certain light in terms of:

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Wavelength

Frequency

Energy

Both (A) and (B)

All of these

Characteristics of optic fibre is/are

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Much thineer

Light weight

Extremely wide bandwidth

All of these

A certain force F increases the length of a wire by 1 mm. The force required to increase its length by 2mm is

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2 F

4 F

8 F

16 F

In a simple microscope if the final image is located at infinity then its magnifying power is

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25/f

25

f/25

[1 + (25/f)]

The SI units of acceleration is

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LT

LT^-1

LT^-2

L²T^-2

The energy required to charge a capacitor of 5 μF by connecting D.C source of 20 kV is

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10 kJ

5 kJ

2 KJ

1 kJ

The direction of a ray of light is.......to the wave front.

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Parallel

Equal

Opposite

Perpendicular

Steel is more elastic than rubber because

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It is a metal

Its density is higher

Ratio of stress to strain is more

Ratio of stress to strain is less

Base quantities are

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Scalars

Vectors

Both

None of these

Two resistances 4Ω and 6Ω are in series they are in parallel with a 10Ω resistance.The equivalent resistance is

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5Ω

8Ω

12Ω

20Ω

If the temperature difference between hot and cold body is greater the heat engine is:

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Not efficient

Less efficient

More efficient

NOne of above

Distance covered by a freely falling body in one second is

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9.8m

4.9m

2.7m

3.9m

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