Question # 1

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

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Different

Zero

The same

None of these

Radiations present in atmosphere due to the presence of different radioactive elements are:

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Cosmic radiations

Background radiations

secondary radiations

Electromagnetic radiations

Radioactive isotopes present in atmosphere is

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Cobalt -60

Ph-32

Carbon -14

Carbon -20

isotopes are atom of same element with different.

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Atomic mass

Atomic number

Number of proton

Number of electron

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

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I.131

Ph -32

Co-60

Ar-40

Human skin, in dry conditions, has a resistance of:

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20,000 ohm

100,000 ohm

30,000 ohm

2000 ohm

The half life of plutonium²³⁶Pu₉₄is:

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2.00 years

2.35 years

2.79 years

2.85 years

The symbol of alpha particles is:

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4AHe

42He

0-1B

00Y

for which of following ampere second could be the unit:

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energy

current

charge

power

the power of washing machine is:

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700 W

750 W

650 W

800 W

When a potential of 10 volt is applied across a conductor, a current of 5 miliampere flows through it, the resistance of the conductor will be:

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200 ohm

2000 ohm

0.2 ohm

0.002 ohm

The number of neutrons in the nucleus of tritium is:

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1

2

3

4

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

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