Question # 1

the resistance of conductor is inversely to:

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temperature

length

area of cross section

pressure

Wave transfer

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Energy

Frequency

Wavelength

Velocity

An object is placed 6 cm away in front of a concave mirror that has 10 cm focal length. Determine the location of the image:

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-5 cm

-10 cm

-15 cm

-20 cm

The time required to complete one round trip (vibration) abut mena position is called:

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Time period

Freqency

Amplitude

None of these

What is fitted in telephone receiver:

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Electromagnet

Diaphragm

Both a and b

None

The half life of carbon -14 is:

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5730 years

5740 years

5750 years

5760 years

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

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89 Protons

90 Protons

91 Protons

93 Protons

Optical fibers work on the principle of:

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Refraction

Reflection

Total internal reflection

Diffraction

The sound level of rustling of leave is:

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1 dB

20 dB

30 dB

10 dB

If we double the distance between two charges, then force becomes

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4-times

1/4th

Double

Half

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 output of a NAND gate is 0 when:

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Both of its inputs are 0

Both of its inputs are 1

Any of its inputs is 0

Any of its inputs is 1

Electric motor converts electrical energy into:

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Chemical energy

Solar energy

Heat energy

Mechanical energy

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