Question # 1

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 speed of light in water is:

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2.0x10³ ms^-1

2.5x10³ ms^-1

2.3x10⁸ ms^-1

2.3x10^-8 ms^-1

Astronauts is space need to communicate with each other by radio links because:

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Sound waves travel very slowly in space.

Sound waves travel very fast in speace

Sound waves cannot travel in space

Sound waves have low frequency in space

Number of poles in a magnet is:

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One

Two

Three

Unlimited

Diffraction of wave can be observed clearly only when the size of slit or obstacle is nearly__________ to the wavelength of the wave:

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Two times

Equal

Four times

None of these

The closed switch in Boolean expression is represented by:

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0

1

10

2

To hear echoes, the minimum distance of the obstacle from source of sound should be:

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10 m

15 m

17 m

20 m

In totally reflecting prism one angle is of:

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45°

90°

180°

120°

The half life of argon nuclide Ar-40 is:

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2 x 10⁸years

2 .2x 10⁸years

2.4x 10⁸years

2.8x 10⁸years

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

If a charged body is brought near a negatively charged electroscope and the leaves of electroscope diverge, then the body is:

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Positively charged

Negatively charged

Neutral

None of these

Electronics is the study of principles by means of which we control the:

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Flow of electrons.

Nuclear fission

Fusion reaction

Radiations

That period in which voltage repeats its value in equal intervals is called:

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cycle

Time period

Frequency

Amplitude

From which of the following you can get information almost about everything?

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Book

Teacher

Computer

Internet

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10th Class Physics English Medium KPK Boards Online Mcqs MCQs With Answers

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