Heat Test

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Heat Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

The most commonly used thermometric substance is

A
water

B
alcohol

C
mercury

D
turpentine
Question 2
1 / -0

At what temperature on the Fahrenheit scale is the reading five times the reading on the Celsius scale?

A
5°F

B
10°F

C
25°F

D
50°F
Question 3
1 / -0

The quantity of heat required to heat a substance depends upon

A
its mass

B
rise in temperature

C
nature of substance

D
all of these
Question 4
1 / -0

The quantity of heat required to raise the temperature of 1 g of substance through 1^oC is called

A
calorie

B
specific heat

C
latent heat

D
water equivalent
Question 5
1 / -0

Quantity of heat required to convert a unit mass of a liquid at its boiling point to vapours at the same temperature is called

A
latent heat of fusion

B
thermal capacity

C
latent heat of vaporization

D
specific heat
Question 6
1 / -0

The amount of ice (at 0^oC) that can be melted by 4000 calories of heat (latent heat of fusion of ice is 80 cal/g) is

A
320 kg

B
50 g

C
0.02 g

D
100 g
Question 7
1 / -0

How many joules of energy are equal to 2.5 calories?

A
10.45 joules

B
1.67 joules

C
5.98 joules

D
2.5 joules
Question 8
1 / -0

If the amount of heat required for heating certain amount of water is 6750 cal, what amount of heat is required in kJ?

A
28.35 kJ

B
6.75 kJ

C
16.07 kJ

D
14.17 kJ
Question 9
1 / -0

For which of the following modes of transfer of heat is a medium required?

A
Conduction

B
Convection

C
Conduction and convection

D
Conduction and radiation
Question 10
1 / -0

Which of the following are bad conductors of heat?
(i) Mercury
(ii) Trapped air
(iii) Wood
(iv) Iron
(v) Asbestos

A
Only (iii) and (v)

B
Only (i), (ii) and (iii)

C
Only (ii) and (iii)

D
Only (ii), (iii) and (v)
Question 11
1 / -0

Which of the following statements is NOT true?

A
Water is a good conductor of heat.

B
In an electric geyser, the heating element is surrounded with a copper tube.

C
Silver is a better conductor of heat than iron.

D
Cooking utensils are provided with handles of bad conductors.
Question 12
1 / -0

In summer, if a wooden chair and an iron chair are both kept in sun and then touched, the iron chair appears to be warmer than the wooden chair. This is because

A
heat is conducted through wood from the wooden chair to the hand

B
heat is conducted through iron from the iron chair to the hand

C
no heat is conducted through iron from the iron chair to the hand

D
heat is conducted neither through the wooden nor through the iron chair

Solution

As iron is the good conductor of heat as compared to the wood, it will absorb more heat and when touched with hand, more heat will flow through iron of the iron chair to the hand.
Question 13
1 / -0

Which of the following is not a consequence of convection?

A
Land and sea breeze

B
Ocean currents

C
Wind in the atmosphere

D
Rising of mercury level in a thermometer
Question 14
1 / -0

Why are two thin blankets put together warmer than one blanket of double the thickness?

A
Conductivity depends upon thickness.

B
Two blankets enclose a layer of air between them.

C
One blanket closes the pores in the other.

D
Two blankets eliminate the air.

Solution

Air is a bad conductor of heat. When two thin blankets are put together, they enclose the layer of air due to which less heat flows out of our body. That is why two thin blankets are usually warmer than one thick blanket.
Question 15
1 / -0

Why is it preferred to wear light coloured clothes in summers?

A
Light coloured clothes reflect most of the heat that falls on them.

B
Light coloured clothes absorb heat that falls on them.

C
Light coloured clothes trap air in between its fibres.

D
Light coloured clothes are poor conductors of heat.
Question 16
1 / -0

How does a hot utensil kept away from the flame cools down?

A
It absorbs heat from the surroundings by radiation.

B
It transfers heat to the surroundings by radiation.

C
It transfers heat to the surroundings by conduction.

D
It absorbs heat from the surroundings by conduction.
Question 17
1 / -0

If half of a slab of ice is covered with a white cloth and the other half is covered with a black cloth, which of the following statements is correct?

A
No ice will melt under white cloth.

B
No ice will melt under the black cloth.

C
More ice will melt under the white cloth than under the black cloth.

D
More ice will melt under black cloth than under white cloth.
Question 18
1 / -0

A drop of water is sprinkled on a red hot iron plate. The drop forms a small sphere but does not vaporise immediately. Why?

A
Because red hot iron is a poor conductor of heat.

B
Because the boiling point of water is raised.

C
Because a layer of water vapours between the drop and plate prevents conduction of heat.

D
Because a layer of water vapours between the drop and plate causes conduction of heat.
Question 19
1 / -0

Which of the following statements is TRUE?

A
The SI unit of temperature is Celsius.

B
Heat energy can be supplied to a substance without increasing its temperature.

C
A good conductor of heat will have high specific heat capacity.

D
Both (1) and (3)
Question 20
1 / -0

Which of the following represents the smallest temperature change?

A
1°C

B
1 K

C
1°F

D
Both (1) and (2)

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Heat Test - 8

Result

Heat Test - 8

Score

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Rank

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SHARING IS CARING

Question 1

water

alcohol

mercury

turpentine

Question 2

5°F

10°F

25°F

50°F

Question 3

its mass

rise in temperature

nature of substance

all of these

Question 4

calorie

specific heat

latent heat

water equivalent

Question 5

latent heat of fusion

thermal capacity

latent heat of vaporization

specific heat

Question 6

320 kg

50 g

0.02 g

100 g

Question 7

10.45 joules

1.67 joules

5.98 joules

2.5 joules

Question 8

28.35 kJ

6.75 kJ

16.07 kJ

14.17 kJ

Question 9

Conduction

Convection

Conduction and convection

Conduction and radiation

Question 10

Only (iii) and (v)

Only (i), (ii) and (iii)

Only (ii) and (iii)

Only (ii), (iii) and (v)

Question 11

Water is a good conductor of heat.

In an electric geyser, the heating element is surrounded with a copper tube.

Silver is a better conductor of heat than iron.

Cooking utensils are provided with handles of bad conductors.

Question 12

heat is conducted through wood from the wooden chair to the hand

heat is conducted through iron from the iron chair to the hand

no heat is conducted through iron from the iron chair to the hand

heat is conducted neither through the wooden nor through the iron chair

Solution

Question 13

Land and sea breeze

Ocean currents

Wind in the atmosphere

Rising of mercury level in a thermometer

Question 14

Conductivity depends upon thickness.

Two blankets enclose a layer of air between them.

One blanket closes the pores in the other.

Two blankets eliminate the air.

Solution