NDA PHYSICS SECTIONAL Test

Question 1:

Fuse operates on which effect of electric current?

Magnetic Effect

Heating Effect

Both Heating and magnetic effect

Chemical Effect

Question 2:

Which of the following is the correct depiction for joule’s law of heating?

H=I²RT

H=IRT

H=IR²T

H=IRT²

Question 3:

Latent Heat of fusion is

The amount of heat energy that is required to change 1 kg of a solid into liquid at atmospheric pressure at its melting point

The amount of heat energy that is required to change 1 kg of a liquid to solid at atmospheric pressure at its melting point

The amount of heat energy that is required to change 1 kg of a solid into gas at atmospheric pressure at its melting point

The amount of heat energy that is required to change 1 kg of a gas into solid at atmospheric pressure at its melting point

Question 4:

Latent heat of vaporization is-

The amount of heat energy that is required to change 1 kg of a solid into vapours at atmospheric pressure at its boiling point is known as the latent heat of vaporization.

The amount of heat energy that is required to change 1 kg of a gas into vapours at atmospheric pressure at its boiling point is known as the latent heat of vaporization.

The amount of heat energy that is required to change 1 kg of a liquid into vapours at atmospheric pressure at its boiling point is known as the latent heat of vaporization.

The amount of heat energy that is required to change 2 kg of a liquid into vapours at atmospheric pressure at its boiling point is known as the latent heat of vaporization.

Question 5:

A local wind system characterized by a flow from sea to land during the day is called sea breeze. Sea breeze is formed in areas near to sea shores due to the process of _____________ of heat.

Radiation

Emission

Conduction

Convection

Question 6:

During summer, water kept in an earthen pot(matki) becomes cool because of the phenomenon of ________.

Osmosis

Evaporation

Diffusion

Transpiration

Question 7:

An electric bulb has a thin wire called-

Shunt

Fuse

Filament

Switch

Question 8:

An electric iron of resistance 20 ohms draws a current of 5 amperes. Calculate the heat produced in 30 seconds.

15 KJ

18 KJ

14 KJ

16 KJ

Question 9:

Centigrade and Fahrenheit temperatures are same at –

-273°

-40°

32°

40°

Question 10:

Which of the following is the best conductor of heat?

Mercury

Silver

Copper

Iron

Question 11:

Which of the following substances has greatest specific heat?

Mercury

Water

Copper

Iron

Question 12:

Metal frying pans have wooden handles due to which of the following reasons?

It gives a good finish

It is hygienic

It has a good grip

Wood is a bad conductor of heat

Question 13:

Which of the following is not a conductor of heat?

Copper

Steel

Aluminium

Wood

Question 14:

Thermometer is based on the principle of –

First law of thermodynamics

Zeroth law of thermodynamics

Law of conservation of momentum

None of the above

Question 15:

The normal temperature of human body is -

37° C

37 K

37°F

36° C

Question 16:

The absolute zero on Celsius scale is-

-200°

-273.15°

-373.15°

None of these

Question 17:

What precaution should be taken when using a laboratory thermometer?

Thermometer should be kept upright not tilted.

The bulb should be surrounded from all sides by the substance of which the temperature is to be measured.

The bulb should not touch the surface of the container.

All of the above

Question 18:

The first law of thermodynamics is simply the case of-

Charles’ law

Newton’s law of cooling

The law of conservation of energy

The law of heat exchange

Question 19:

Which of the following is not based on heating effect of electric current?

Electric Heater

Refrigerator

Fuse

Electric Iron

Question 20:

100 joules of heat is produced per second in a 4 ohm resistor. What is the potential difference across the resistor ?

20 V

22 V

24 V

25 V

NDA PHYSICS SECTIONAL Test - 3

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NDA PHYSICS SECTIONAL Test - 3

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