Heat Test

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Heat Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

The freezing point on a thermometer is marked as 20° and the boiling point as 150°. A temperature of 60°C on this thermometer will be read as

A
40°

B
65°

C
98°

D
110°

Solution

Suppose:
P = Ax + B
When x = 0 and P = 20^oC, then
B = 20^oC
When x = 100^oC and P = 150^oC, then
150 = 100A + 20
A = 1.3
Now, when x = 60^oC,
P = 1.3 x 60 + 20 = 98^oC
Question 2
1 / -0

The study of physical phenomena at low temperature (below liquid nitrogen) is calledrefrigeration

A
refrigeration

B
radiation

C
cryogenics

D
pyrometry

Solution

Cryogenics is the study of physical phenomena at low temperatures.
Question 3
1 / -0

Gaps are kept between railway tracks because

A
in winters, the tracks may contract

B
friction is produced and the speed of train may not increase beyond a limit for safety reasons

C
the replacement of the track is easier when there is gap in the track

D
expansion of tracks takes place and some free space is required for free expansion

Solution

Gaps are kept between railway tracks because of thermal heating. The tracks expand and require some space to expand.
Question 4
1 / -0

During severe winter in low temperature zones of the world, the superficial parts of the lakes are frozen leaving water below. The freezing at the bottom is prevented because

A
conductivity of ice is low

B
water has large latent heat of fusion

C
water has large specific heat

D
temperature of the earth at the bottom of lake is high

Solution

The freezing at the bottom is prevented because water, when it freezes becomes less dense and hence rises to the top. This sheet of ice on the top acts as a barrier to the water at the bottom.
Question 5
1 / -0

During severe winter in low temperature zones of the world, the superficial parts of the lakes are frozen leaving water below. The freezing at the bottom is prevented because

A
conductivity of ice is low

B
water has large latent heat of fusion

C
water has large specific heat

D
temperature of the earth at the bottom of lake is high

Solution

The freezing at the bottom is prevented because water, when it freezes becomes less dense and hence rises to the top. This sheet of ice on the top acts as a barrier to the water at the bottom.
Question 6
1 / -0

If we touch a piece of copper and another piece of glass at 40^oC, then copper will feel hotter because

A
copper has higher atomic mass

B
density of copper is more

C
our body temperature is nearly 37^oC

D
copper has higher specific heat

Solution

Copper has a higher specific heat than glass. It means that the heat required to raise the temperature of copper by one degree centigrade is more for copper as compared to glass. Hence, it feels hotter.
Question 7
1 / -0

The radiating power of a body depends on

A
nature of the surface

B
difference in temperature of body

C
area of the surface

D
all of the above

Solution

Radiating power of a body depends upon the following factors:
(a) nature of the surface
(b) difference in temperature of the body and the surroundings
(c) area of the surface

Hence, all of the above is the correct option.
Question 8
1 / -0

If the temperature of the sun is doubled, the rate of energy received on earth will be increased by a factor of

A
2

B
4

C
8

D
16

Solution

The radiation emitted is directly proportional to the 4^th power of temperature of the body.

If sun`s temperature is doubled, then its radiation will become 16 times.

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Re-Attempt Weekly Quiz Competition

Heat Test - 5

Result

Heat Test - 5

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SHARING IS CARING

Question 1

40°

65°

98°

110°

Solution

Question 2

refrigeration

radiation

cryogenics

pyrometry

Solution

Question 3

in winters, the tracks may contract

friction is produced and the speed of train may not increase beyond a limit for safety reasons

the replacement of the track is easier when there is gap in the track

expansion of tracks takes place and some free space is required for free expansion

Solution

Question 4

conductivity of ice is low

water has large latent heat of fusion

water has large specific heat

temperature of the earth at the bottom of lake is high

Solution

Question 5

conductivity of ice is low

water has large latent heat of fusion

water has large specific heat

temperature of the earth at the bottom of lake is high

Solution

Question 6

copper has higher atomic mass

density of copper is more

our body temperature is nearly 37oC

copper has higher specific heat

Solution

Question 7

nature of the surface

difference in temperature of body

area of the surface

all of the above

Solution

Question 8

2

4

8

16

Solution

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our body temperature is nearly 37^oC