Question # 1

The conductivity of a superconductor is

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Infinite

Very large

Very small

Zero

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

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Germanium

Silicon

Arsenic

Gallium

Indium

When the total displacement is divided by total time taken, we get:

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Velocity

Average speed

Average velocity

None of these

The resistivity of a substance depends upon the

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length

mass

area

temperature

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

When a suitable small resistance is put in parallel with the galvanometer coil, it is converted into

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Voltmeter

Avometer

Ammeter

None of these

To observe interference of light, the condition, which must be met with is that the sources must be:

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Monochromatic

Phase coherent

Both of above

None of above

Field lines are closer to each other in the region where the filed is

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Stronger

Weaker

Much weaker

Absent

None of these

When the emitter-base junction of a transistor is reverse biased, collector current

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Reverses

Increases

Decreases

Stops

Velocity of sound in vacuum (in m/s) is

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330

1000

156

0

Which of the following represents an electric current?

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C^-1

CS^-1

J.S^-1

dynes^-1

The percentage uncertainties are when current I is following 0.84 ± 0.05 A due to potential difference 5.2 ± 0.1 V. The uncertainty of R is

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7.72 ± 0.5 ohm

6.62 ± 0.5 ohm

6.6 ± 0.5 ohm

None of these

An electric room radiator, which operates at 50V has resistance of 50 Ω. Power of the radiator is approximately:

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100W

50W

450W

1000W

The electrical conductivities of insulators are ranging from

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10^-5to 10^-10(Ω m)^-1

10^-10to 10^-15(Ω m)^-1

10^-5to 10^-15(Ω m)^-1

10^-10to 10^-20(Ω m)^-1

A radioactive substance has a half-life of 4 months. Three-fourths of the substance will decay in:

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5months

6months

8months

7months

A fly is sitting on the objective of a telescope pointed towards the moons what effect is impacted in a photograph of the moon taken through the telescope

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The entire field of vision is blocked

There is image of the fly on the photograph

There is no effect at all

There is the reduction in intensity of the image

Two particles of equal masses are revolving in circular paths of radii r₁ and r₂respectively with the same speed The ratio of their centripetal force

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r₂/r₁

√(r₂/r₁)

(r₂/r₁)

(r₂/r₁)²

We are living in the age of

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Technology

Information technology

Space age

None of these

Substances that donot flow easily are

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Honey

Thick tar

Mobile oil

All of these

If λ = 589 nm d=1.0 mm L=225 cm then fringe spacing ΔY is given by

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1.76 mm

1.80 mm

1.37 mm

1.33 mm

The SI unit of torque is

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Nm^-1

Nm^-2

Ncm

Nm

Multimode step index fibre has diameter as

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40 μm

50 μm

60 μm

None of these

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