Question # 1

Minimum energy needed to escape an electron ofrm metal surface is called:

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Threshold energy

Threshold frequency

Work function

Work ability

Curie is unit of.

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Conductivity

Binding energy

Radioactivity

Resistivity

A battery is used in

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ohmmeter

Ammeter

Galvanometer

Voltemeter

An AVO meter can also be called as.

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Digital multimeter

Digital voltmeter

Digital ammeter

Digital ohm meter

Heat energy is converted into electrical energy.

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Solar cells

thermocouples

Electric generators

None of above

Which one of the following bulbs has the least resistance.

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100 W

200 W

500 W

1000 W

In a transistor, collector current is controlled by:

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Collector voltage

Base current

Collector resistance

All of the above

The unit of temperature co efficient of resistivity is.

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Ohm -m

K-1

K

Ohm

The velocity of electron moving is 1st orbit of hydrogen atom is:

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2.09 x 10⁶ ms^-1

2.18 x10⁶ ms^-1

2.19 x 10⁶ ms^-1

3.18 x10⁶ ms^-1

The stopping potential for a certain metal is 10 volts. Thus work function for the cathode is.

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10 J

1.6 X 10^-18 J

1.6 X 10^-19 J

1.6 X 10³⁰ J

GM counter uses

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Alcohol only

Bromine

argon

Neon and bromine

Which is not fundamental logic gate.

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NOT

AND

OR

NAND

The material whose resistivity becomes zero below a certain temperature

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Conductors

Semi conductors

Super conductors

Insulators

the current which flows from a point at higher. potential to point at lower potential is called.

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Electric current

Conventional current

Either of these

None of above

Charge on positron is:

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Negative

Positive

Netural

None of these

Which of the modulus of elasticity is involved in compressing a rod to decrease its length ?

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Young's modulus

Bulk modulus

Modulus of elasticity

None of these

Which of the following converts electrical energy into mechanical energy.

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Transformer

A.C. generator

D.C. generator

D.C. motor

Some charge is being given to a conductor. Then its potencial

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Its maximum at surface

Its maximum at Its maximum at center

Is remain same throughout the conductor

Is maximum somewhere between surface and centre

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