Question # 1

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 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

Which of the following is not processing:

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Arranging

Manipulating

Calculating

Gathering

Which is the best material for making connecting wires:

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Iron

Copper

Tungsten

Nickel

A positive and negative charges are initially 4 cm apart. When they are moved closer together so that they are now only 1 cm apart, the force between them is:

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4 times smaller than before

4 times larger than before

8 times larger than before

16 times larger than before.

Which frequency is used by elephants to communicate with each other:

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Zero frequency

Low frequency

Medium frequency

High frequency

The wave properties

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Reflection

Refraction

Diffraction

All of these

Big unit of capacitance is:

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Farad

Volt

Watt

Coulomb

Simplest electrical circuits use:

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One wire

Two wires

Four wires

Five wires

Which device is used to increases / decreases A.C Voltage?

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Electric motor

Transformer

A.C Generator

Solenoid

SI unit of capacitance is:

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Joule

Volt

Watt

Farad

What should household appliances be connected in parallel with the voltage source?

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to increase the resistance of the circuit

to decrease the resistance of the circuit

to provide each appliance the same voltage as the power source

to provide each appliance the same current as the power source

The point through which rays of light pass after reflection from concave mirror is called principal:

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Focus

Circle

Axis

Radius

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