Question # 1

The value of electrical constant of proportionality k is

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9 x 10⁹Nm²C^-2

9 x 10^-9Nm²C^-2

9 x 10¹⁰Nm²C²

9.85 x 10^-12N^-1C^-2

The SI unit of magnetic flux is.

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weber

Nm^-1A^-1

tesla

gauss

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

The liquid which conduct current is known as

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heating effect

chemical energy

electrolyte

ohm's law

The smooth or steady streamline flow is known as

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laminar flow

turbulent flow

both of them

none of them

Examples of polymeric substances are:

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Plastic

Synthetic rubbers

Zirconia

All of these

Both (A) and (B)

The direction of lines of force depends upon the direction of

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voltage

current

charges

none of these

The ratio of the r.m.s value of the applied voltage to the r.m.s value of resulting a.c. is

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Impedance

Inductance

Reactance

Resistance

Plan of a coil makes an angle of 20º with the lines of magnetic field. The angle between B and vector area of plane of coil is:

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Also 20º

70º

90º

180º

None of these

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

What is the coefficient of mutual inductance, when the magnetic flux changes by 2 X 10^-2Wb, and change in current is 0.01 A?

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2 H

3 H

1/2 H

Zero

Which of the material have largest value of young's modulus

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Copper

Diamond

Aluminum

Iron

A two-slit arrangement is set up to produce an interference pattern on a screen. The fringes are too close together for convenient observation. How could the distance between them be increased?

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by using a light of longer wavelength

by increasing the width of the slits

by decreasing the distance between the screen and slits

the distance between the fringes is impossible

Two light sources obtained from single source are called

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non-coherent sources

coherent sources

monochromatic sources

spherical sources

One cannot see through 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 droplets in fog

No body begins to move or comes to rest of itself said by

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Thomos Young

Abu Ali Sena

Newton

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

Which of the following cannot have an effect on the weight of an object?

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The distance of the object from a planet

The acceleration of the object

The placement of the object on a different planet

The mass of the object

The valence band of an atom in a solid

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is always empty

may or may not be empty

can never be empty

none of them

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

150 N

If a charged spherical conductor of radius 10 cm has potential V at a point distance 5 cm from its centre,then the potential at a point distance 15 cm from the centre will be

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1/3 V

2/3 V

3/2 V

3 V

The low blood pressure is

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70 - 80 torr

75 - 80 torr

78 - 809 torr

79 - 80 torr

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