Question # 1

Two electric bulbs of 200 W and 100 W have same voltage. If R₁and R₂be their resistance respectively then

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R₁= 2R₂

R₂= 2R₁

R₂=4R₁

R₁= 4R₂

The special theory of relatively treats the problems involving:

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Inertial frames of reference

Non-inertial frames

Non-accelerated frame

Botha (A) and (C)

Both (B) and (C)

A p-n junction is formed when a crystal of silicon is growth in such a way that its one half is doped with trivalent impurity and the other half with a impurity from

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2nd group

fourth group

fifth group

sixth group

Resistance is measured in

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volts

ampere

ohm

watt

The direction of lines of force depends upon the direction of

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voltage

current

charges

none of these

Majority charge carriers in the p-region of p-n junction are:

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electrons

positrons

Holes

Neutrons

None of these

The conductivity of a superconductor is

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Infinite

Very large

Very small

Zero

Si units of time period is

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second

hertz

revolution

vibration/sec

With the help of 50 K v electron microscope, a resolution of

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0.5 to 1 m to possible

1 m to 10 m is possible

0.5 to 1 nm is possible

1 to 10 nm is possible

The contrast in the fringes in an interference pattern depends upon

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Fringe width

Relative difference intensities of the two sources

Distance between the slits

Wavelength

A train of 150 m length is going towards north direction at a speed of 10 ms^-1. A parrot files at a speed of 5 ms^-1towards south direction parallel to the railway track. The time taken by the parrot to cross the train is equal to

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12 s

8 s

15 s

10 s

A prism splits a beam of white light into seven component colors. This is so because

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Phase of different colors is different

Amplitude of different colors is different

Energy of different colors is different

Velocity of different colors is different

A material with high retentively and large corcivety most useful to make

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Electromagnet

Permanent magnet

Choke

None of these

Polaristion is a phenomenon associated with a certain type of wave.

Which condition must be fulfilled if the wave is to be polarised?

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It must be a light wave

It must be a transverse wave

It must be a longitudinal wave

Proportion of light in an optical fibre requires that the light-should be within the fibre

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Very little confined

Largely confined

Totally confined

None of these

The speed of light in a medium of refractive index 1.5 is

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3 x 10⁸ms^-1

4.5 x 10⁸ms^-1

2.0 x 10⁸ms^-1

None of these

The original source of geothermal energy is

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Biomass

Fossil fuels

Moon

Earth

The body is in equilibrium when it is in a state of

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Accelerated motion

Uniform motion

Rest or uniform motion

None of these

A beam of light enters air from water.Which of the following characteristics of light will not change in water?

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Frequency

Wavelength

Velocity

Amplitude

The second law is concerned with the conversion of heat into work which the head added

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Equivalent

Greater

Lower

None of these

Approximate power of an electric heater in watts

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2 × 10⁸

2 × 10⁵

2 × 10³

2.1 × 10⁴

Wavelength of light of frequency 100 Hz is

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2 x 10⁶m

3 x 10⁶m

4 x 10⁶m

5 x 10⁶m

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