Question # 1

Photo diode detects.

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Visible light

Radio waves

X rays

All of them

The mutual inductance of the coils depends upon.

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Stiffness of the coils

Density of coils

Material of coils

Geometry of the coils

The concept of direction is purely

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Relative

Absolute

Relative to the motion

None of these

Which one is not present in A.C. generator.

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Armature

Magnet

Slip rings

Commutator

Radius of first Bohr's orbit is.

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0.053 nm

0.053 mm

0.053 micro meter

0.053 m

If speed of rotation of a generator is doubled the output voltage will be.

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Remain same

Double

Four time

One half

The impurity in the germinium is usually in the ratio of

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1:10⁶

1:10⁴

1:10⁸

1:10¹⁰

Base of transistor is of order:

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10^-11m

10⁶m

10^-8m

10^-6m

The fact that electric field exist in space around an electrical charge is

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Electrical property

Gravitational property

Intrinsic property of nature

Extrinsic property of nature

The crystalline structure of NaCl is.

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Cubical

Hexagonal

Tri gonal

Tetragonal

Concept of the electric field lines is introduced by

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Coulomb

Faraday

Einstein

Joseph henry

The number of crystal system are

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Three

Five

Seven

Fifteen

In metal detector, we use.

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L-C circuit

R-L circuit

R-C circuit

RLC series circuit

unit of Plank's constant is same as that of.

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Acceleration

Angular momentum

Linear momentum

Entropy

How many times, the alpha particle is more massive than electrons.

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6332

7332

8332

9332

When platinum is it becomes orange at

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500^oC

900^oC

1100^oC

1300^oC

The charge on Beta particle is

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+e

-e

-2e

None of these

A material which is insulator at 0 K and conduct at room temperature is.

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Silver

Lead

Germanium

Polythene

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