Heat Test

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Heat Test - 5

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Weekly Quiz Competition

Question 1
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 2
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 3
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 4
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 5
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 6
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 7
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 8
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 9
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 10
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 11
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 12
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 13
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 14
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 15
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 16
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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Re-Attempt Weekly Quiz Competition

Heat Test - 5

Result

Heat Test - 5

Score

-

Rank

-

SHARING IS CARING

Question 1

320 kg

50 g

0.02 g

100 g

Question 2

10.45 joules

1.67 joules

5.98 joules

2.5 joules

Question 3

28.35 kJ

6.75 kJ

16.07 kJ

14.17 kJ

Question 4

Conduction

Convection

Conduction and convection

Conduction and radiation

Question 5

Only (iii) and (v)

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

Only (ii) and (iii)

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

Question 6

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 7

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 8

Land and sea breeze

Ocean currents

Wind in the atmosphere

Rising of mercury level in a thermometer

Question 9

Land and sea breeze

Ocean currents

Wind in the atmosphere

Rising of mercury level in a thermometer

Question 10

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

Question 11

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

Light coloured clothes absorb heat that falls on them.

Light coloured clothes trap air in between its fibres.

Light coloured clothes are poor conductors of heat.

Question 12

It absorbs heat from the surroundings by radiation.

It transfers heat to the surroundings by radiation.

It transfers heat to the surroundings by conduction.

It absorbs heat from the surroundings by conduction.

Question 13

No ice will melt under white cloth.

No ice will melt under the black cloth.

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

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

Question 14

Because red hot iron is a poor conductor of heat.

Because the boiling point of water is raised.

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

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