Question # 1

When we double the voltage in a simple electric circuit, we double the:

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Current

Power

Resistance

Both a and b

Release of energy by the sun is due to

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Nuclear fission

Nuclear fusion

Burning of gases

Chemical reaction

The number of neutrons in the nucleus of tritium is:

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1

2

3

4

Circuit breaker works on the principle of:

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Electric current

Magnetism

Electromagnetism

Electrostatics

Isotopes are atoms of same element with different :

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Atomic mass

Atomic Number

Number of proton

Number of Neutron

The reason carbon dating work is that.

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Plants and animals are such strong emitters of carbon 14

After a plant or animal dies, it stops in fresh carbon

There is so much non radioactive carbon dioxide in the air

When a plant or animal dies.

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

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Resistance

Reactance

Resistivity

None

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

The equivalent resistance of a parallel combination is:

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Equal to sum of all resistance

Is greater than the largest resistance of combination

Is smaller than the smallest resistance of combination

All of these

The phenomenon in which radiations convert the matter into positive and negative ions is called:

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Radio activity

Excitation

Ionization

Electrolysis

isotopes are atom of same element with different.

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Atomic mass

Atomic number

Number of proton

Number of electron

What happen to the atomic number of an element which emits one alpha particle?

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Increase by 1

Stays the same

Decrease by 2

Decrease by 1

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