Heat: MCQ Test (25 questions)

Question 1 of 25

The thermal conductivity of silver is higher than that of copper.

Aare less
Bis more
Cis equal to
Dnone of these

Question 2 of 25

The temperature at which a liquid changes into vapour after receiving heat is called-

AMelting point
Bmelting point
CBoiling point
DNone of these

Question 3 of 25

The temperature at which a solid substance changes into a liquid after receiving heat is called-

ABoiling point
BMelting point
CEvaporation
DNone of these

Question 4 of 25

Which of the following is correct?

A(F+32)/9=C/5
B(F-32)/9=C/5
C(C-5)/9=F/32
D(F-5)/9=C/32

Question 5 of 25

Sublimate substance is-

AKapoor
BNaphthalene
Cammonium chloride
DAll of the above

Question 6 of 25

How many degrees centigrade is 14 degrees Fahrenheit?

A-20
B20
C-10
D10

Question 7 of 25

The temperature at which ice, water and vapour remain in equilibrium is called—

AFreezing point
BBoiling point
Ccritical temperature
Dtriple point

Question 8 of 25

thermometer suitable for measuring 2000°C is-

AVapor Pressure Thermometer
Bmercury thermometer
CFull radiation pyrometer
Dgas thermometer

Question 9 of 25

Which is the method of heat transfer in which the particles of the medium do not move?

Aconduction
Bconvection
Cradiation
Dall of which

Question 10 of 25

To convert the temperature taken on Kelvin scale to Celsius scale, the given temperature will be in ........

AAdding 273
BDividing by 273
CMultiplying by 273
Dsubtract 273

Question 11 of 25

The water from the hand pump is hot in winter because-

AIn winter our body is cold, hence water appears warm.
BThe temperature inside the Earth is higher than the temperature in the atmosphere
CThe pumping action creates friction, which heats the water.
DWater from inside comes out and absorbs heat from the surroundings

Question 12 of 25

When an object is cooled, its molecules-

Aincreases the energy of
Bincreases the energy of
Cincreases the mass of
Dincreases the weight of

Question 13 of 25

Steam burns are more painful (serious) than boiling water burns.

ASteam has latent heat,
BSteam is a type of gas and it immerses the body quickly.
CSteam easily enters the body through the pores present in the body.
DSteam has a very high temperature

Question 14 of 25

The morning sun is not as hot as the afternoon sun because-

AThe sun's rays move slowly in the morning.
BThe sun is cold in the morning.
CThe Earth is farther from the Sun in the morning
DIn the morning, the sun's rays have to travel a greater distance in space.

Question 15 of 25

On which principle is the Total Radiation Pyrometer based?

AOn the Seebeck effect
BOn the Peltier effect
COn Stefan's law
DOn Joule's effect

Question 16 of 25

Clothes keep us warm in winter because-

Aprovide heat
BDoes not radiate heat.
CPrevents air from coming into contact with the body
DPrevents body heat from escaping

Question 17 of 25

Boiling point (BP) of liquid due to impurities –

Aincreases
Bhappens to
Cremains the same
DThere is no connection

Question 18 of 25

Stefan's law of radiation is-

AE∝1/T4
BE∝T2
CE∝T4
DE∝1/T2

Question 19 of 25

What effect does the addition of impurities have on the melting point?

Aincreases
Bdecreases
Cremains unchanged
Dnone of these

Question 20 of 25

What is the transfer of heat through molecular structure called?

Aconduction
Bconvection
Cradiation
Dscattering

Question 21 of 25

The boiling point (BP) and freezing point (FP) of water on the Celsius scale are, respectively-

A0°C and 100°C
B100°C and 0°C
C212°C and 32°C
D32°C and 212°C

Question 22 of 25

When hot water is poured over a thick glass tumbler, it shatters. What is the reason for this?

ASuddenly the glass expands.
BSuddenly the glass shrinks.
CThe water evaporates.
DGlass is chemically repelled by water.

Question 23 of 25

At what temperature is the cryogenic test performed?

A20°C
B40°C
C- 100°C
D-196°C

Question 24 of 25

Due to which of the following processes the water in an earthen pot remains cool?

Aliquefaction
Bevaporation
CUplift
DNone of these

Question 25 of 25

Water kept in an earthen pot cools down during summer days due to the following phenomenon-

Adiffusion
Btranspiration
COsmosis
Devaporation