Question # 1

In a three phase a.c. generator, there are

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2 coils

3 coils

1 coild

No coil

The unit of resistivity is

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ohm

ohm-m²

ohm-meter

ohm-m^-1

At ordinary temperature, an increase in temperature increases the conductivity of

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Conductor

Semiconductor

Insulator

Alloy

The sources of magnetic field are

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isolated magnetic poles

charges at rest

charges in motion

none of these

An induced current can be produced by:

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Constant magnetic field

Changing magnetic field

Varying magnetic field

Constant electric field

None of these

A fluid at a certain point has 50 J of potential energy per unit volume, 75 J of kinetic energy per unit volume,and 35 J of pressure energy per unit volume. the total energy of the fluid is

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125 J

90 J

160 J

85 J

The body oscillates due to ______ accelerates and overshoots the rest position due to _______

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Applied force, Inertia

Restoring force, Friction

Frictional force, Inertia

Restoring force, Inertia

The flux through a closed surface depends upon:

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Shape of geometry of the closed surface

Charge enclosed

Nature of the medium

Both (A) and (B)

Both (B) and (C)

At high altitude the blood oozes out of the nose and ear because

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The blood pressure increase at high altitudes

The percentage of oxygen in the air increase

The atmospheric pressure decrease there

The density of blood decrease at high altitudes

If electric and gravitational force on an electron in a uniform electric field will be

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E=mg/q

E=q/mg

E=,g/q

E=qg/m

Centripetal acceleration is also called ________ acceleration

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Tangential

Radial

Angular

None of these

The more viscous liquids is

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Coal tar

Honey

Kerosene oil

Water

A planet is observed by an astronomical refracting telescope having an objective of focal length 16 m and an eyepiece of focal length 2 cm.

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The distance between the objective and the eyepiece is 8m

The angular magnification of the planet is 200

The image of the planet is inverted

The objective is smaller than the eyepiece

The burnt gas expelled from the rocket engine with

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High velocity

Extremely high velocity

Very high velocity

None of these

An ideal heat engine can only be 100% efficient if its exhaust temperature is equal to

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0°C

0k

100°C

Temperature of source

Which of the following types of optical fibre has a very thin core of about 5μm diameter and has a relatively large cladding?

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single mode step index fibre

multi-mode step index fibre

multi-mode graded index fibre

none of them

If band gap between valence and conduction band material is 5 eV. The material is

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Insulator

Good conductor

Semiconductor

Such material are not exist

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 axis of ration of an object will not change its orientation unless

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Internal torque acts

Internal torque acts in one direction

External torque acts

None of these

A Celsius degree is larger than a Fahrenheit degree by

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5/9

9/5

9/10

9/8

The relative permitivity for vacuum is

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1

2

1.002

1.004

The medium in which speed of light is the same in all directions is called

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non-homogeneous medium

homogeneous medium

both of them

empty medium

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