Question # 1

The value of E₀in coulomb's law is:

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9 x 10⁹Nm²C^-2

8.85 x 10^-12C²N^-1m^-2

8.85 x 10^-12Nm²C^-2

9 x 10⁹C²N^-1m^-2

Electric flux is defined by the relation

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E.A.

E x A

E/A

none of these

When a silicon crystal is doped with a pentavalent element, such an extrinsic semi-conductor is called

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p-type semi-conductor

n-type semi-conductor

either of them

none of them

The isotope/s of hydrogen is /are:

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Protium

Deuterium

Tritium

Both (A) and (B)

All of these

Resistance of a conductor is increased, the currant will

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Decrease

Increase

Remain the same

None of these

At the top of the trajectory of a projectile the acceleration is

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The maximum

The minimum

Zero

g

Which are not the elementary particles?

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Photons

Leptons

Hadrons

Quarks

None of these

1 gm-cm^-3is equal to:

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10³kg-m^-3

10^-3kg-m^-3

1 kg-m^-3

10⁶kg-m^-1

An electron of charge e coulomb passes through a potential difference of V volts its energy in joules will be

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V/e

eV

e/V

V

One KWh is equal to:

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3.6 x 10²J

3.6 KJ

3,6 x 10¹KJ

3,6 MJ

Solar cell converts sunlight directly into

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potential energy

thermal energy

mechanical energy

electrical energy

The cores of electromagnets used for alternating currents where the specimen repeatedly undergoes magnetization and demagnetization should have

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broad hysteresis curves

narrow hysteresis curves

any one of the them

none of them

Optical device used in spectrometer

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Simple microscope

Compound microscope

Telescope

Any of them

For the conversion of heat into work, the two bodies are essential as temperature which is

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Similar

Very little difference

Large difference

None of these

The mass of the object is a quantitative measure of its

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speed

velocity

acceleration

Inertia

The direction of angular acceleration is

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Opposite of the axis of rotation

Along the axis of rotation

Perpendicular to the axis of rotation

None of these

For a fixed force, larger is the mass of a body

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Greater acceleration

Small acceleration

Same acceleration

None of these

At disstolic pressure

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Flow become laminar

Gurgle disappears

External pressure becomes equal

All of these

The systolic pressure is

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120 torr

130 torr

150 torr

80 torr

A bar of length L, cross-section A and Young's modulus Y, is pulled by a force F from both ends so as to produce an elongation x. Then:

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x∝1/L

x∝A

x∝1/A

x∝Y

The mass of Uranium atom is

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10^-10 Kg

10^-15 Kg

10^-20 Kg

10^-25 Kg

A rubber cord 100 cm long is elongated 1 cm by a stretching force of 0.2 N. The cross-sectional area of the cord is 0.04 cm². Find the Young's modulus for that rubber.

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0.5 N cm^-2

0.05 N cm^-2

50 N cm^-2

500 N cm^-2

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