Question # 1

Photo diode is used for detection of.

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Heat

Magnet

Current

Light

X=A+B is the mathematical notation for.

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OR gate

NOR gate

NAND gate

AND gate

Controlling rods inserted into the reactor are of metal:

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Aluminium

Cadmium

Magnesium

Copper

Gamma rays from cobalt -60 are used for treatment of.

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Circulation of blood

Cancer

Heart Attack

Thyroid glands

The circuit in which current and voltage are in phase, the power factor is:

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Zero

1

-1

2

In case of A.C. through resistor V and I are

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At 0^o with each other

At 180 ^o with each other

At 90^o with each other

At 270 ^o with each other

Light of 4.5 eV is incident on a Cesium surface and stopping potential is 0.25 eV, maximum K.E. of emitted electron is.

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4.5 eV

4.25 eV

4.75 eV

0.25 eV

A galvanometer is an electrical instrument used to

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Measure resistance

Measure voltage

Detect passage of current

None of these

Which is not characteristic of Laser.

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Monochromatic

Coherent

Intense

Multi direction

The early Greeks believed that matter waves was

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Discrete

Continuous

Both continuous and discrete

All of above

The quantity time constant RC has units of.

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Charge

Time

Capacitance

Resistance

The Si unit of Mutual inductance is:

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VA^-1S^-1

VAS^-1

VSA^-1

ASV^-1

The substance which atom cooperates with each other in such a way so as to exhibit a strong magnetic field is called.

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Ferromagnetic

Paramagnetic

Diamagnetic

Non magnetic

When a pot difference of 4 volt is applied across resistance, 10 J of energy is converted Find charge flows

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0.20 C

2.5 C

5.0 C

10.0 C

Boher proposed his atomic model in:

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1910

1911

1912

1913

The solids are classified as

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Polymeric

Amorphous

Crystalline

All of above

The expression P = VI hold only when current and voltage are.

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In phase

Out of phase

At right angle to each other

At angle of 120 ^o

One use of a single p-n junction semiconductor in an electrical circuit is a

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Rectifier

Transistor

Battery

Diode

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