Heat Test

Result

Heat Test - 16

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Weekly Quiz Competition

Question 1
1 / -0

An instrument used to measure high temperature is

A
Pyrheliometer

B
Pyrometer

C
Tachometer

D
Pyknometer

Solution

An instrument used to measure high temperature is Pyrometer.
A pyrometer is used to measure high temperatures in the furnace. It is a type of remote sensing thermometer used to measure temperature for the surface.
Pyrheliometers measure only the sunlight from a small area around the sun.
A tachometer is an instrument measuring the rotation speed of a shaft or disk.
A gas pycnometer is a laboratory device used for measuring the density or, more accurately, the volume of solids.
Question 2
1 / -0

Transmission of heat by the movement of heated particles is called

A
Conduction

B
Convection

C
Radiation

D
Regelation

E
Expansion

Solution

Convection is a mode of heat transfer in which the molecules near the heat source get heated up, expand, become less dense, and rise upwards. But the relatively colder molecules sink to the bottom and eventually get heated up. Thus the transmission of heat by the movement of heated particles is called convection.
Question 3
1 / -0

By the process of convection the transfer of heat is always-

A
upwards

B
downwards

C
sideways

D
in all possible directions

Solution

By the process of convection the transfer of heat is always upwards.
Liquid and gases are bad conductors of heat. They are heated mainly by the process of convection. Solids can't be heated by the process of convection, In the process of convection the transfer of heat is always vertically upwards.
Question 4
1 / -0

In which mode of transfer of heat molecules pass on heat energy to neighbouring molecules without actually moving from their positions?

A
convection

B
radiation

C
conduction

D
none of these

Solution

Conduction is the mode of heat transfer of heat molecules pass on heat energy to neighbouring molecules without actually moving from their positions.
Conduction is the transfer of heat from one substance to another by direct contact without mixing of masses.
Question 5
1 / -0

The continuous movement of a fluid when heated is called :

A
convectional current

B
conduction current

C
electric current

D
magnetic current

Solution

Convection is a process of transfer of heat through a fluid (liquid or gas) caused by molecular motion. When the particles of the medium get heated and move up and the cooler particles come down to take their place, then they get heated and move up, and a continuous movement of fluid takes place as long as the source of heat is there, then its called a convectional current.
Question 6
1 / -0

During day time the air becomes warm due to the process of-

A
conduction

B
convection

C
radiation

D
expansion

Solution

During day time the air becomes warm due to process of radiation.
Heat transfer through radiation takes place in form of electromagnetic waves mainly in infrared region. Radiation emitted by a body is consequence of thermal agitation of its composing molecules.
Question 7
1 / -0

Convection cannot take place in_______

A
solids

B
liquids

C
gases

D
None of the above

Solution

Convection can't take place in solids.
Convection is transfer of heat through fluid (liquid or gas) caused by molecular motion.
Question 8
1 / -0

The rate at which a body radiates heat depends on-

A
its temperature

B
its colour

C
its nature (dull or shiny)

D
all of these

Solution

The rate at which body radiates depends upon its nature (shiny or dull).
Nature represents emmisivity of body (radiation emittence) and absorptivity of medium (radiation absorptance of medium compared to black body).
Question 9
1 / -0

Select the odd one out w.r.t. conduction of heat (wood, mica, plastic, iron)

A
iron

B
plastic

C
wood

D
mica

Solution

Iron is a good conductor of heat rest all are insulators
Question 10
1 / -0

Select the odd one out (conduction, convection, radiation, expansion)

A
conduction

B
convection

C
radiation

D
expansion

Solution

All are modes of heat transfer while expansion is an effect of heat

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Heat Test - 16

Result

Heat Test - 16

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SHARING IS CARING

Question 1

Pyrheliometer

Pyrometer

Tachometer

Pyknometer

Solution

Question 2

Conduction

Convection

Radiation

Regelation

Expansion

Solution

Question 3

upwards

downwards

sideways

in all possible directions

Solution

Question 4

convection

radiation

conduction

none of these

Solution

Question 5

convectional current

conduction current

electric current

magnetic current

Solution

Question 6

conduction

convection

radiation

expansion

Solution

Question 7

solids

liquids

gases

None of the above

Solution

Question 8

its temperature

its colour

its nature (dull or shiny)

all of these

Solution

Question 9

iron

plastic

wood

mica

Solution

Question 10

conduction

convection

radiation

expansion

Solution

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