Question # 1

The distance between principal focus and pole of mirror is called:

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Principal focus

Focal length

Aperture

Image

At extreme position potential energy of the pendulum is:

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Maximum

Minimum

Both a and b

Zero

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

When you rub a plastic rod against your hair several times and put it near some bits of paper, the pieces of papers are attracted towards it. What does this observation indicate?

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the rod and the paper are oppositely charged

the rod acquires a positive charge

the reod and the paper have the same charges

the rod acquires a negative charge

The speed of sound in iron at 25°C is:

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5950 m/sec

5900 m/sec

6950 m/sec

6940 m/sec

The quantities, whose values remain constant or vary continuously are called.

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Analogue quantities

Digital quantities

Maximum quantities

Minimum quantities.

Why household appliances should 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

What is the direction of the magnetic field lines inside a bar magnet?

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From north pole to south pole

From south pole to north pole

From side to side

There are no magnetic field lines.

Electric field lines:

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always cross each other

never cross each other

cross each other inthe region of strong field

cross each other in the region of weak field

The coulomb's law is valid for the charges which are:

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moving and point charges

moving and non-point charges

stationary and pont charges

stationary and large size charges

The particles emitted from a hot cathode surface are:

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Positive ions

Negative ions

Proton

Electron

In electric motor, the brushes are made of:

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Lead

Graphite

Iron

Wood

isotopes are atom of same element with different.

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Atomic mass

Atomic number

Number of proton

Number of electron

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