Question # 1

The half -life of carbon is

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5730 years

5700 years

5720 years

572 years

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 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 range of galvanometer to measure current is:

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few amperes

few micro amperes

few milli amperes

mega amperes

Which particles are nucleons?

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Electrons and protons

Protons and neutrons

Electrons and neutrons

Electrons and positrons

The rating of a fuse wire is always expressed in:

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ampere-hours

KWh

Volts

Amperes

the resistance of conductor is inversely to:

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temperature

length

area of cross section

pressure

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

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Same

Zero

Different

Infinite

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 half life of radium 226 is

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1600 year

1610 years

1620 years

1630 years

an ideal voltmeter is that which draws:

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small current

no current

high current

none of these

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

If we double both the current and the voltage in a circuit while keeping its resistance constant, the power:

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Remains unchanged

Halves

Doubles

Four time

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

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Different

Zero

The same

None of these

Isotopes are atoms of same element with different :

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Atomic mass

Atomic Number

Number of proton

Number of Neutron

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

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metals

wood

glass

plastic

Watt is equal to:

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Coulomb per second

Newton per second

Volt per second

Joule per second

V²/R=:

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Power

Energy

Voltage

Resistance

for which of following ampere second could be the unit:

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energy

current

charge

power

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Physics 10th Class English Medium Unit 9 Online Test MCQs With Answers

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