Question # 1

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

battery is one of the source of:

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heat

light

current

sound

The half life of plutonium²³⁶Pu₉₄is:

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2.00 years

2.35 years

2.79 years

2.85 years

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

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Current

Power

Resistance

Both a and b

The A.C used in Pakistan has frequency:

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60 Hz

30 Hz

50 Hz

130 Hz

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

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Radio activity

Excitation

Ionization

Electrolysis

The symbol of atomic mass number is:

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A

X

N

Z

Which element is used for the monitoring of thyroid glands?

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Iodine- 131

Phosphorus-32

Carbon-14

Potassium-40

an ideal voltmeter is that which draws:

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small current

no current

high current

none of these

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

Which among the following radiation has more penetrating power?

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A beta pareticle

A gamma particle

An alpha particle

None of these

the resistance of an ammeter should be:

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high

very high

low

constant

Isotopes are atoms of same element with different :

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Atomic mass

Atomic Number

Number of proton

Number of Neutron

If 2 joules of energy is required to transfer one coulomb of charge from one point to another, the potential difference between these points will be:

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1V

2V

4V

6V

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 colour of live wire is:

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Black or blue

Green or yellow

White or grey

Red or brown

V²/R=:

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Power

Energy

Voltage

Resistance

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

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20,000 ohm

100,000 ohm

30,000 ohm

2000 ohm

When a uranium (92 protons) ejects a beta particle, how many protons are left in the remaining nucleus?

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92 protons

91 protons

93 protons

89 protons

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