Question # 1

To turn the transistor OFF, the base current is set:

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At maximum value

At zero

Either (A) or (B)

All are correct

None of correct

In case of metallic conductors, the charge carriers are

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Protons

Electrons

Antiprotons

Positrons

Both A and B

Which one of the following physical quantities changes with relativistic speed

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Length

Mass

Time

All of the above

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

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electrons

positrons

Holes

Neutrons

None of these

The capacitance of a parallel plate capacitor depends upon

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Area of the plates

Separation between the plates

Medium between the plates

All of the above

A body with frequency would complete one vibration in:

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f seconds

1/f seconds

1 second

f²second

The number of protons inside a nucleus is called

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mass number

atomic weight

atomic number

none of these

The heat required to raise the temperature of one mole of the substance through 1 K is called

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heat capacity

specific heat capacity

molar specific heat

all of them

When small number of atoms from some other suitable element is added to the semi-conductor material, then this process is known as

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impurification

adding

doping

extrinsivity

The rate of decay of radioactive substance

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is constant

decrease exponentially with time

varies inversely as time

decreases linearly with time

The restoring force is ______ amd opposite to the applied force within _____:

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Equal, elastic limit

Different, the walls of the laboratory

Different, elastic limit

None of these

Powered and remote control guided missiles are used for

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long ranges

short ranges

medium ranges

none of them

A compound microscope is consists of

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One convex lens

Two convex lenses

Two concave lenses

None of these

Under normal circumstances the volume of the blood is sufficient to keep the vessels

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Inflated all the time

Deflated all the time

Contracted all the time

Squeezed all the time

Shear modulus for brass is

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36

39

51

65

The gravitational pull of earth on a mass of 20 kg on the surface of earth is

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20 N

196 N

19.6 N

1960 N

Which of the following graph represents the velocity of a spherical body falling through a viscous medium

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M.K.S. unit of pressure

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Atmosphere

Dynes per sq.cm

Meter

Pascal

Two masses m₁ and m₂ have equal momentum their kinetic energies are in ratio of

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m₂: m₁

m²1 : m₂²

m₁: m₂

m₂^{2 :}m²1

A diffraction grating of length 2cm has 4000 lines The grating element is

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0.5 x 10^-2 cm

5 x 10⁴

5 x 10^-4

0.5 x 10^-4 cm

The expansion or compression must take place slowly in order to keep constant

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Volume

pressure

Temperature

None of these

For assessment of total uncertainty when added or subtracted the absolute uncertainties are

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Multiplied

Divided

Added

Subtracted

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