Question # 1

The half life of plutonium²³⁶Pu₉₄is:

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2.00 years

2.35 years

2.79 years

2.85 years

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

100x10³ A= :

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10^-3 A

10^-2 A

10 A

10^-1A

The unit of electric power is:

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Volt

Watt

Joule

Coulomb

Safe limit of radiations exposure in one year.

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4 rem

5 rem

3 rem

6 rem

The current which does not change its direction is called:

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A.C

D.C

Conventional

Transient current

What is the amount of current passing through an electric heater, if it takes 1800C charge pass through it in 3 minute:

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16 A

10 A

100 A

0.1 A

Circuit breaker works on the principle of:

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Electric current

Magnetism

Electromagnetism

Electrostatics

How Galvanometer is connected in circuit to detect current:

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In series

In parallel

Fixed

Variable

The commercial unit of electrical energy is:

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Joule

Watt

Kilowatt hour

Electron volt

The temperature at the centre of sun is.

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10 million k

20 million k

30 million k

35 million k

battery is one of the source of:

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heat

light

current

sound

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 resistance of conductor is inversely to:

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temperature

length

area of cross section

pressure

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

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Radio activity

Excitation

Ionization

Electrolysis

What is the power rating of a lamp connector to a 12 V source when it carries 2.5 A:

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4.8W

14.5W

30W

60W

Release of energy by the sun is due to

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Nuclear fission

Nuclear fusion

Burning of gases

Chemical reaction

The half of carbon 14 is

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5720 years

5730 years

5740 years

5750 years

The colour of live wire is:

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Black or blue

Green or yellow

White or grey

Red or brown

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

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