Question # 1

The temperature at the centre of sun is.

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10 million k

20 million k

30 million k

35 million k

The commercial unit of electrical energy is:

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Joule

Watt

Kilowatt hour

Electron volt

Which element is used to locate the ulcer in brain?

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Iodine-131

Phosphorus-32

Carbon-14

Potassium-40

100x10³ A= :

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10^-3 A

10^-2 A

10 A

10^-1A

Joule’s law is W=

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IR/t

IRt²

IR²t

I²Rt

The property of substance, which opposes the flow of current through it is called:

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Resistance

Reactance

Resistivity

None

Isotopes are atoms of same element with different :

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Atomic mass

Atomic Number

Number of proton

Number of Neutron

the range of galvanometer to measure current is:

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few amperes

few micro amperes

few milli amperes

mega amperes

A thermistor is a dependent resistors:

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Heat

temperature

energy

mass

The half life of radium - 226 is 1620 years. If N is its total amount then after the four half lives, its left amount will be:

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1/2 N

1/4 N

1/8 N

1/16 N

Who discovered the phenomenon of natural radioactivity?

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Henry Becurial

Merry Curi

Perry

Rutherford

The half life of Lead Pb is

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10 hour

10.10 hours

10.6 hours

1 year

When a heavy nucleus splits into lighter nuclei,the process would.

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Release nuclear energy

absorb nuclear energy

Release Chemical energy

Absorb Chemical Energy

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