Heat Test

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Heat Test - 25

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Weekly Quiz Competition

Question 1
1 / -0

Cooking utensils are made up of

A
Good conductors of heat

B
bad conductors of heat

C
neither good conduction not bad conductors of heat

D
None of these

Solution
Question 2
1 / -0

A cotton sheet is ironed with hot electricity. How is energy transferred through the metal base of the iron to the sheet?

A
by conduction only

B
by convection only

C
by radiation only

D
by convection and radiation only

Solution

Conduction occurs when two objects at different temperatures are in contact with each other. Heat flows from the warmer to the cooler object until they are both at the same temperature.
The iron and cotton sheet is in contact with each other so, there is conduction between them.
Energy transformation while ironing clothes takes out their wrinkles and makes them smooth. This takes the heat, which is one type of energy. In the iron, electrical energy is used, and it is transformed into heat energy.
Question 3
1 / -0

The process in which rate of transfer of heat is maximum is :

A
conduction

B
convection

C
radiation

D
in all these, heat is transferred with the same speed

Solution

$$\textbf{Step 1}$$:
There are three modes of transmission of heat. They are Conduction, convection and radiation.
Conduction: In this mode of transmission. heat dissipates from one place to another by molecular vibration. It is relevant to solid only. Conduction needs a medium to transfer heat.
Convection: Heat is transferred from one place to another by the transfer of molecules. It happens only in liquids or gases. It also needs a medium to transfer heat.
Radiation: It transfers heat in the form of electromagnetic waves. It can heat any form of material. It doesn't need any medium for the transfer of heat.
$$\textbf{Step 2}$$:
We know that radiation travels with the speed of light. So, the rate of heat transfer is maximum in radiation in the form of electromagnetic radiation.
Thus option C is correct.
Question 4
1 / -0

For an ideal conductor, thermal resistance is :

A
unity

B
infinity

C
zero

D
1000

Solution
Question 5
1 / -0

The lowest attainable fahrenheit temperature is

A
$$-100^{\circ} F$$

B
$$-459.4^{\circ} F$$

C
$$-300^{\circ} F$$

D
$$-373.2^{\circ} F$$

Solution

The lowest possible temperature, or absolute zero as it is called is $$-459.4^{o} F$$. By international agreement, absolute zero is taken as −273.15 degrees on the Celsius scale (International System of Units), which equals $$-459.4^{o} F$$ degrees on the Fahrenheit scale
Hence, option B is correct.
Question 6
1 / -0

Statement-1
Radiation involves transfer of heat by electromagnetic waves.
Statement-2
Electromagnetic waves do not required any material medium for propagation.

A
Statement-1 is true, Statement-2 is true and Statement-2 is the correct explanation for Statement-1.

B
Statement-1 is true, Statement-2 is true but Statement-2 is not the correct explanation for Staement-1.

C
Statement-1 is true, Statement-2 is false.

D
Statement-1 is false, Statement-2 is true.

Solution

Electromagnetic waves are formed due to simultaneous oscillations in electric and magnetic field (both are perpendicular to each other and perpendicular to the propagation of the em wave). Both electric and magnetic fields can exist in a vacuum and do not need a material medium to exist or oscillate. So an electromagnetic wave can propagate without a medium.
These radiations carry energy with them, so when a body releases radiation it loses energy, which manifests into a temperature loss. When radiation (energy) is absorbed, the body gains energy which is manifested in the form of a temperature gain. This is basically a heat transfer with radiation.
Both statement 1 and Statement 2 are true, but Statement-2 is not the correct explanation for Staement-1.
Option B is correct.
Question 7
1 / -0

Which of the follwing is the smallest rise in temperature?

A
$$1^{\circ}F$$

B
$$1K$$

C
$$1^{\circ}C$$

D
All are of equal value

Solution

There are 180 divisions in the Fahrenheit scale between the ice point and steam point while there are only 100 divisions in a Celsius scale.
And one scale division of a Kelvin scale is same as that of a Celsius scale.
So, $$1^0F$$ indicates a smaller rise in temperature than $$1^0C$$ and $$1K$$.
Question 8
1 / -0

If we place our hand below a lighted electric bulb. We feel warmer because of :

A
convection

B
radiation

C
conduction

D
both A and B
Solution
There are three ways by which heat transfers:
Conduction: for which the two bodies need to be in contact

Convection: for which there needs to be a material medium between the two bodies

Radiation: which occurs if there is a temperature difference, irrespective of whether there is a material medium or not.

In this case, there is a medium between the two. But the two bodies are not in contact.
Hence, there is radiation and convection which matches with option D.
Question 9
1 / -0

By which of the following methods could a cup of hot tea lose heat when placed on metallic table in a class room
a) conduction
b) convection
c) radiation
d) evaporation of liquid.

A
a, b

B
b,c

C
a,b,c

D
a,b,c,d

Solution

Conduction occurs through the walls of the cup.
Radiation occurs from the top surface.
Convection occurs at the top of the cup.
Evaporation of liquid also occurs.
Question 10
1 / -0

Assertion (A): When hot water is poured in a thick glass tumbler then the tumbler breaks.
Reason (R): Glass is a bad conductor of heat

A
A and R are correct and R is correct

explanation for A

B
A and R are correct and R is not correct

explanation for A

C
A is true and R is false

D
A is wrong and R is true.

Solution

When hot water is poured into a thick tumbler its inner surface expands. However, Since glass is bad conductor of heat , the heat does not go to outer surface and the expansion of outer surface of the tumbler is quite small. Due to uneven expansion of the outer and inner surfaces, the tumbler breaks. because the heat will try to escape but the glass would not allow it and in the process ultimately glass breaks down.

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Heat Test - 25

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Heat Test - 25

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SHARING IS CARING

Question 1

Good conductors of heat

bad conductors of heat

neither good conduction not bad conductors of heat

None of these

Solution

Question 2

by conduction only

by convection only

by radiation only

by convection and radiation only

Solution

Question 3

conduction

convection

radiation

in all these, heat is transferred with the same speed

Solution

Question 4

unity

infinity

zero

1000

Solution

Question 5

$$-100^{\circ} F$$

$$-459.4^{\circ} F$$

$$-300^{\circ} F$$

$$-373.2^{\circ} F$$

Solution

Question 6

Statement-1 is true, Statement-2 is true and Statement-2 is the correct explanation for Statement-1.

Statement-1 is true, Statement-2 is true but Statement-2 is not the correct explanation for Staement-1.

Statement-1 is true, Statement-2 is false.

Statement-1 is false, Statement-2 is true.

Solution

Question 7

$$1^{\circ}F$$

$$1K$$

$$1^{\circ}C$$

All are of equal value

Solution

Question 8

convection

radiation

conduction

both A and B

Solution

Question 9

a, b

b,c

a,b,c

a,b,c,d

Solution

Question 10

A and R are correct and R is correct explanation for A

A and R are correct and R is not correct explanation for A

A is true and R is false

A is wrong and R is true.

Solution

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A and R are correct and R is correct

explanation for A

A and R are correct and R is not correct

explanation for A