Question # 1

The electrode connected with the positive terminal of the current source is called

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cathode

anode

electrolyte

position

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

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

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2 coils

3 coils

1 coild

No coil

The magnifier forms a virtual image of the object at:

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Least distance of distinct vision

Much farther than the least distance

Both A and B are correct

None of these

The He-Ne laser discharge tube is filled with:

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85% He

15% He

50% He

60% He

85% Ne

Direction of motion_______ in circular of motion:

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Changes off and on

Changes continuously

Does not change

None of them

The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be

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500 m

500 nm

500 km

500 cm

None of these

A mass of 5kg moves with an acceleration of 10m s^-2force applied is

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10N

50N

2N

20N

A potential barrier of 0.7 V exists across p-n junction made from:

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Germanium

Silicon

Arsenic

Gallium

Indium

Avo-meter is used of measure the

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current, voltage

voltage, resistance

resistance, current

current, voltage and resistance

X-ray are also known as

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Roentgen rays

Maxwell rays

Plank range

Einstein rays

The moment of linear momentum of a body is called

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Angular momentum

Couple

Impulse

Torque

With a step-index fibre, the overall time difference between all the wavelengths arrived at the other end may be about

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43 s per km

33 s per km

1 ns per km

33 ns per km

Semiconductor materials have the conductivities generally lies between

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10^-5 to 10^-6 (Ωm)^-1

10^-6 to 10^-4 (Ωm)^-1

10^-7 to 10^-3 (Ωm)^-1

None of these

Linear momentum is a

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fixed quantity

constant quantity

scalar quantity

vector quantity

The fractional change in volume per unit increase is pressure in called:

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Pressure coefficient

Volume coefficient

Bulk modulus

Compressibitlity

The viscosity of liquid is due to

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Adhesive force

Cohesive force

Gravitational force

Diffusion

The idea that all magnetic effects may be due to circulating currents (i.e moving charges) Was first held by

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Ampere

Faraday

Lenz

Gauss

If the tension in a string stretched between two fixed points is made four times, the frequency of the fundamental harmonic will become:

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Two times

Three times

Four times

Six times

If both the length and radius of rod are doubled, then the modulus of elasticity will:

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Increase

Decrease

Remains the same

Doubled

Single mode step index fibre has a very thin core of about diameter

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5.5 μm

9.5 μm

5.0 μm

All of these

Which one of the following waves cannot be polarized

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Radio waves

X-rays

Transverse waves in a string

Longitudinal waves in a gas

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