Question # 1

As the current flow through the wire:

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It generates heat in the wire

It produces sound in the wire

Resistance of the wire decreases

Voltage across the ends is increased

None of these

Light has:

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Wave nature

Particle nature

Dual nature

None of these

Computer chips are made from:

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Iron

Silicon

Helium

Stontium

Aluminium

According to the special theory of relativity

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mass and energy are same entities

mass and energy are same entities but interconverible

mass and energy are different entities but interconverible

mass and energy are different entities but non-interconveritble

If water in a closed bottle is taken up to the moon and opened, the water gets

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Freeze

Boiled

Dissociated into O₂and H₂

Evaporated

Linear momentum is a

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fixed quantity

constant quantity

scalar quantity

vector quantity

In a straight current carrying conductor, the direction of magnetic field can be found by

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right hand rule

left hand rule

head to tall rule

none of these

Electromagnetic radiation or photons interact with matter in

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two distinct ways

three distinct ways

four distinct ways

five distinct ways

For the normal operation of the transistor, its

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emitter-base and collector base junctions are forward biased

emitter-base junction is reversed biased and collector base junction is forward biased

emitter-base junction is forward biased and collector-base junction is reverse biased

any one of these

The example of reversible process is

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an explosion

changes occur suddenly

slow compression of a gas

all of them

The first super conductor was discovered in

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1811

1890

1901

1911

The more readily fissionable isotope of uranium has an atomic mass of:

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220

230

235

240

In full wave rectification, the output D.C. voltage across the load is obtainedfor

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The positive half cycle of input A.C. (C) The complete cycle of input A.C.

The negative half cycle of input A.C.

The complete cycle of

All of the above

In the formulaα_amino= 1.22λ/D, D denotes

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Distance between source and the object

Diameter of lens

Power of the lens in Diopters

None of these

The rater of flow is measure in

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Liter-sec

Liter/sec

Liter/sec²

Sec/liter

The danger signals are red while the eye is more sensitive to yellow because

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Scattering in yellow colour is less than that of red

Red light is longer in wavelength than yellow light

Scattering in red is less than that of in yellow

Red colour has greater frequency than yellow light

Energy can be added to a system even though heat transfer is

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Maximum

Minimum

Zero

None of these

The Permitivity ε_o of free space has the value in S.I. units is

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8.85 × 10^-10 C² N^-1 m^-2

8.85 × 10^-11 C² N^-1 m^-2

8.85 × 10^-12 C² N^-1 m^-2

8.85 × 10^-13 C² N^-1 m^-2

1 joule is equal to electrons volt

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1.6 x 10^-19

1.6 x 10¹⁹

6.25 x 10¹⁹

6.25 x 10¹⁸

In Multimode step index fibre the refractive index from its centre to the boundary is

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1

1.55

1.52

1.43

A copper ball of radius r is moving with a uniform velocity v in the oil. The dragging force acting on the ball is F. The dragging force on the copper ball of radius 2r moving with uniform velocity 2v in the oil is

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F

2F

4F

8F

The capacity of a parallel plat capacitor depends on the

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Type of metal used

Thickness of plates

Potential applied across the plates

Separation between the plates

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