Question # 1

Rate of flow can be expressed in

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litre/sec

litre-sec

sec/litre

sec/litre-m

The electric intensity outside the two oppositely charged parallel metal plates is

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Maximum

Minimum

Zero

Infinite

The direction of the streamlines is the same as the direction of the

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force

torque

velocity

weight

The motional e.m.f depends upon the

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Length of a conductor

Strength of a magnet

Speed of the conductor

All of the above

Magnetic effect of current is used:

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In electric motor

To detect current

To measure current

All of these

None of these

Work done on a body by gravity in lifting it up to certain height is

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Maximum

Minimum

Zero

Negative

Which of the following is not a projectile

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a bullet fired from a gun

a space ship

a football in air

an artillery shell

The rate change of area expressed is expressed in:

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m²s^-1

ms^-2

m²s^-2

ms^-1

None of these

In a building, there are 15 bulbs of 40 watts, 5 bulbs of 100 watts, 5 fans of 80 watts and a heater of 1 kilowatt. The voltage of the electric main is 220 volts. The minimum efficiency of the main fuse of the building will be

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0.4 A

11.4 A

9.8 A

10.6 A

Distance covered by a freely failing body n the first second of its motion will be:

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4.9 m

9.8 m

19.6 m

29.4 m

A spring of constant k = 0.4 N m^-1_{is to be extended thorugh 10 cm at a place where g = 10 m sec}^-2. The mass to be suspended should be:

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4 gms

0.4 gms

40 gms

None of these

The valence energy band may be either

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Completely filled

Partially filled

a and b

All of them

The number 134.7 should be written as

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13.47 × 10²

1.347 × 10²

13.47 × 10³

None of these

The typical speed of light, radio-waves, X-rays microwaves is

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28,000,0000 ms^-1

29,000,0000 ms^-1

30,000,0000 ms^-1

None of these

The angle of incidence at which angle of refraction becomes 90⁰ is called

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Incident angle

Angle of refraction

Critical angle

Phase angle

When a light signal travels along the length of the optical fibre, the power lost by it is due to

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Reflection

Refraction

Seattering and absorption

Diffraction

When light passes through a tourmaline crystal, it becomes

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plane polarized

directly polarized

un-polarized

spherically polarized

A light wave produced by oscillating charge consists of a periodic variation of

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electric field

magnetic field

either of them

both of them

The vector sum of three vectors gives a zero resultant. What can be the orientations

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90^o

60^o

120^o

180^o

Basic principle of an optical fibre is

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Reflection

Scattering

Polarization

Total internal reflection

Keeping in view the Earth surface the value of g on the equator is

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Zero

Minimum

Maximum

None of these

The wire used in resistance thermometer is platinum wire because

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Its resistance increase uniformly with rise in temperature

It is inert

Its melting point is very high

All of the above

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