Question # 1

The Half life of a certain isotopes is 1 day. What is the quantity of isotopes after 2 days?

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One half

One quarter

One eight

None of these

The half life of carbon -14 is:

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5730 years

5740 years

5750 years

5760 years

When 1 tonne of coal is burnt then amount of energy is released .

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36 x 10⁸ J

36 x 10⁹J

36 J

36 x 10¹⁰J

a fuse is connected in series with:

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neutral wire

live wire

earth wire

cable wire

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 galvanometer has been named after the scientist:

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Lewis

Lowry bronsted

Luigi Galvano

Galvano Einstein

Watt is equal to:

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Coulomb per second

Newton per second

Volt per second

Joule per second

Release of the energy by the sun is due to:

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Nuclear Fussion

Nuclear Fission

Burning of gases

Chemical reaction

The number of neutrons in the nucleus of tritium is:

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1

2

3

4

When resistances are connected in parallel, the current passing through them is:

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Same

Zero

Different

Infinite

For observing how fast plants are absorbing phosphate fertilizer we use.

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I.131

Ph -32

Co-60

Ar-40

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

in a dry cell, chemical energy changes into:

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mechanical energy

electrical energy

potential energy

kinetic energy

By keeping resistance constant if we double the voltage then current will be:

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Double

4 times

¼ times

Half

The A.C used in Pakistan has frequency:

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60 Hz

30 Hz

50 Hz

130 Hz

The temperature at the centre of sun is.

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10 million k

20 million k

30 million k

35 million k

Safe limit of radiations exposure in one year.

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4 rem

5 rem

3 rem

6 rem

earth wire is connected with those appliances whose casing is made of:

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metals

wood

glass

plastic

According to ohm’s law V= :

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I²R

IR²

IR

I/R

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