Question # 1

If speed of electron is 5 x 10⁵m/s. How long does it take one electron to transverse 1 m?

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1 x 10⁶

2 x 10⁶

2 x 10⁵

1 x 10⁵

In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is

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Helium

Neon

Both

None of these

The electric field intensity at a point due to a point charge

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Falls off inversely as the distance

Falls off inversely as the square of distance

Remains unchanged with distance

Increase directly as square of distance

If a force of 0.05 N produces an elongation of 20 mm in a string, then its spring constant will be:

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250 N m^-1

25 N m^-1

2.5 N m^-1

None of these

In LCR circuit which one of the following statement is correct?

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L and R oppose each other

R value increase with frequency

The inductive reactance increases with frequency

The capacitive reactance increases with frequency

A succession of events which bring the system back to its initial condition is called

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reversible process

irreversible process

a cycle

none of them

If we draw a graph between d (along x-axis) and F (along y-axis) and get a straight line horizontal to x-axis, then area under this straight line represents:

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Power

Work

Pressure

None of these

Newton's laws are adequate for speeds that are

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low compared with the speed of light

equal to the speed of light

greater than the speed of light

all of them

Neutron was discovered by

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Curie

Roentgen

Chadwick

Rutherford

The work done moving a body between two points in a conservation field is independent of the:

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Direction

Force applied

Path followed by the body `

Power

Which of the following diode is used to derive the current in external circuit when light is incident in the circuit

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photo diode

light emitting diode

photo voltaic cell

none of these

An optical fibre with its protective case may be typically

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6 m

6 mm

6 cm

6 nm

Heat is a form of

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Power

Work

Energy

Motion

Approximate power of a pocket calculator in watts

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7.5 × 10²

7.5 × 10^-2

7.5 × 10^-4

7.5 × 10^-5

A stationary wave is established in a string which vibrates in four segments at afrequency of 120 Hz. Its fundamental frequency is:

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15Hz

60Hz

30Hz

430Hz

The terminal velocity of a 2 cm radius ball in liquid is 20 cms^{-1. What would be the terminal velocity if the radius of the ball were halved? Keeping the mass constant}

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80 cms^-1

40 cms^-1

20 cms^-1

5 cms^-1

Three quarks make up a:

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Leptons

Mesons

Baryons

Quark

Number of spark plugs needed in diesel engine is:

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Four

Five

Six

None of these

Negative and positive charge in a hollow sphere are equal in the number then flux from the surface will be

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Zero

Positive

Negative

Flux will be both negative and positive

With a step-index fibre, the overall time difference between all the wavelengths arrived at the other end may be about

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43 s per km

33 s per km

1 ns per km

33 ns per km

Distance traveled by a body falling from rest in the first,second and third second is in the ratio of

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1 : 2 : 3

1 : 3 : 5

1 : 4 : 9

None of the above

The unit of surface energy per unit area may be expressed as

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Nm^-2

Nm^-1

Nm

Nm²

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