Heat Test

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Heat Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

Convert the 300K temperature to Celsius scale.

A
573^oC

B
27^oC

C
1.09^oC

D
148.8^oC

E
184.44^oC

Solution

SI unit of temperature is Kelvin.
T (K) = T (^oC) + 273

300K = (300 - 273)^oC = 27^oC
Question 2
1 / -0

Which of the following is an incorrect way of reading a clinical thermometer?

A
We should hold the thermometer by the bulb while reading it.

B
We should ensure that before use, the mercury level is below 35°C.

C
We should wash the thermometer, preferably with an antiseptic solution before use.

D
We should read the thermometer keeping the level of mercury along the line of sight.

Solution

We should not hold the thermometer by its bulb while reading it. It would affect the temperature reading.
Question 3
1 / -0

If the readings on Celsius and Fahrenheit scale of thermometers read the same numerical value when placed on a substance, then the temperature of the substance measured is

A
-40^oC

B
40^oC

C
0^oC

D
32^oC

E
-32^oC

Solution

The relation between Celsius and Fahrenheit scales is given by .
Let the value of temperature be X.
Since, the temperature readings are same on both the scales.

9X = 5X - 160
Solving for X, we get
X = -40
Question 4
1 / -0

Land and Sea breezes occur along coastal areas or areas with adjacent large water bodies. Water and land have different heating abilities. Water takes a bit more time to warm up and is able to retain the heat longer than land does. These breezes take place due to

A
convection

B
conduction

C
radiation

D
temperature

E
heat

Solution

The motion of warm material that rises, cools off, and sinks again, producing a continuous circulation of material and transfer of heat is called convection. So, land breeze and sea breeze are caused by convection only.
Question 5
1 / -0

A student is doing some experiments in the chemistry lab. He goes to take the temperature of a liquid which is boiling in a beaker. While doing so, he checks the temperature of the boiling liquid by dipping a lab thermometer into it. Why does he not take the thermometer out of the liquid before reading the temperature?

A
The level of mercury begins to fall as soon as the lab thermometer is taken out.

B
The level of mercury rises when it is taken out.

C
He does it by mistake.

D
The method helps him to get the reading of desired temperature.

E
This is done as it is not a solid.

Solution

The level of mercury begins to fall as soon as the lab thermometer is taken out as the air around has lesser temperature.
Question 6
1 / -0

Which of the following options correctly classifies the objects listed below as conductors and insulators?

(i) Aluminium wire
(ii) Steel spoon
(iii) Wooden handle
(iv) Silver coin
(v) Plastic bottle
(vi) Blade of knife

A

Conductors: (i), (ii), (vi)

Insulators: (iii), (iv), (v)

B

Conductors: (i), (ii)

Insulators: (iii), (iv), (v), (vi)

C

Conductors: (i), (ii), (iv), (vi)

Insulators: (iii), (v)

D

Conductors: (i), (ii), (iv)

Insulators: (iii), (v), (vi)

Solution

Aluminium wire, steel spoon, silver coin, blade of knife allow heat to pass through them. Therefore, these are conductors.
Wooden handle and plastic bottle do not allow heat to pass through them. So, these are insulators.
Question 7
1 / -0

During severe winters, water in a lake starts freezing

A
first at the bottom

B
first at the surface

C
as a whole

D
first in the middle

Solution

The air is very cold above the surface of water. The heat from the surface of the water escapes to the environment. As a result, the temperature at the surface is lowered, whereas below the surface it is warmer.
Hence, the lake starts freezing first at the surface.
Question 8
1 / -0

Which of the following statements is not true?

A
All hot bodies radiate heat.

B
The transfer of heat by radiation requires a medium.

C
The temperature of an object increases due to absorption of heat by the object.

D
The heat from sun reaches us by the process known as radiation.

Solution

The transfer of heat by radiation does not require any medium.
Question 9
1 / -0

Which of the following statements is/are false?

a. Maximum and minimum temperatures of the previous day, reported in weather reports are measured by a thermometer is called bimetallic thermometer.
b. A thermometer that is used by doctors to measure temperature of his patients is known as clinical thermometer.
c. The thermometer that consists of a very fine glass tube having a very small bore is called a capillary tube.

A
Only a

B
Only a and b

C
Only b

D
Only b and c

E
Only c

Solution

Maximum and minimum temperatures of the previous day, reported in weather reports, are measured by a thermometer is called maximum and minimum thermometer.
Question 10
1 / -0

Which of the following statements is/are false?

a. Conduction starts once the two objects or the parts of the same object have attained the same temperature.
b. Cooling coils of air conditioners are made of copper as they readily conduct away heat.
c. Heat energy does flows through bad conductors, but at a very small rate as compared to good conductors.

A
Only a

B
Only a and b

C
Only b

D
Only b and c

E
Only c

Solution

Once the two objects or the parts of the same object have attained the same temperature, conduction stops.

Question 11

1 / -0

Match the following:

a. Conduction	1. It is the process of transfer of heat in material bodies, due to the actual movement of the particles of the medium.
b. Convection	2. It is the process of transfer of heat in material bodies, without the actual movement of the particles of the medium.
c. Radiation	3. It is the process of transfer of heat from a hot body to a cold body, without the aid of any external medium.

a - 2, b - 3, c - 1

a - 2, b - 1, c - 3

a - 1, b - 2, c - 3

a - 1, b - 3, c - 2

a - 3, b - 1, c - 2

Solution

Conduction is the process of transfer of heat in material bodies, without the actual movement of the particles of the medium.
Convection is the process of transfer of heat in material bodies, due to the actual movement of the particles of the medium.
Radiation is the process of transfer of heat from a hot body to a cold body, without the aid of any external medium.

Question 12
1 / -0

During winter, a tourist was given a choice of using either one thick blanket or two thin blankets joined together. He chose two thin blankets which were joined together. Why?

A
It would have resulted in the formation of a layer of air in between the blankets, and air is a good conductor of heat.

B
It would have resulted in the formation of a layer of air in between the blankets, and air is an insulator.

C
It would have resulted in no air formation between the two blankets.

D
None of these

Solution

The two blankets joined together would have a layer of air formed between them. Air being an insulator prevents the body heat from escaping to the surroundings. Hence, option (2) is correct.
Question 13
1 / -0

Sea breeze blows during

A
night

B
day

C
summers

D
winters

Solution

During day time, land gets heated more than sea water. Hot air above the land rises up and, therefore, the cold air from sea moves towards beach or land. This is known as a sea breeze.
Question 14
1 / -0

Which of the following options holds good, when we go out with an umbrella in the sun?

A
The umbrella allows all the heat falling on it to pass through it.

B
The umbrella reflects back all the heat falling on it.

C
The umbrella absorbs all the heat falling on it.

D
A part of the heat falling on the umbrella is reflected, part of it is absorbed and the rest is transmitted.

Solution

When the heat from the sun falls on an umbrella, a part of it is reflected, a part of it is absorbed and the rest is transmitted.
Hence, option (4) is correct.
Question 15
1 / -0

The door of a running refrigerator inside a closed room was left open. Which of the following observations will be seen?

A
The room will be warmed up gradually.

B
The temperature of the room will remain unaffected.

C
The room will become as cold as the refrigerator.

D
The room will be cooled slightly.

Solution

Refrigerator is a device that transfers heat from inside a box to its surroundings.
If you leave the door open, heat is merely recycled from the room into the refrigerator, then back into the room. A net room temperature increase would result from the heat of the motor that would be constantly running to move energy around in a circle.

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Heat Test - 7

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Heat Test - 7

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SHARING IS CARING

Question 1

573oC

27oC

1.09oC

148.8oC

184.44oC

Solution

Question 2

We should hold the thermometer by the bulb while reading it.

We should ensure that before use, the mercury level is below 35°C.

We should wash the thermometer, preferably with an antiseptic solution before use.

We should read the thermometer keeping the level of mercury along the line of sight.

Solution

Question 3

-40oC

40oC

0oC

32oC

-32oC

Solution

Question 4

convection

conduction

radiation

temperature

heat

Solution

Question 5

The level of mercury begins to fall as soon as the lab thermometer is taken out.

The level of mercury rises when it is taken out.

He does it by mistake.

The method helps him to get the reading of desired temperature.

This is done as it is not a solid.

Solution

Question 6

Conductors: (i), (ii), (vi) Insulators: (iii), (iv), (v)

Conductors: (i), (ii) Insulators: (iii), (iv), (v), (vi)

Conductors: (i), (ii), (iv), (vi) Insulators: (iii), (v)

Conductors: (i), (ii), (iv) Insulators: (iii), (v), (vi)

Solution

Question 7

first at the bottom

first at the surface

as a whole

first in the middle

Solution

Question 8

All hot bodies radiate heat.

The transfer of heat by radiation requires a medium.

The temperature of an object increases due to absorption of heat by the object.

The heat from sun reaches us by the process known as radiation.

Solution

Question 9

Only a

Only a and b

Only b

Only b and c

Only c

Solution

Question 10

Only a

Only a and b

Only b

Only b and c

Only c

Solution

Question 11

a - 2, b - 3, c - 1

a - 2, b - 1, c - 3

a - 1, b - 2, c - 3

a - 1, b - 3, c - 2

a - 3, b - 1, c - 2

573^oC

27^oC

1.09^oC

148.8^oC

184.44^oC

-40^oC

40^oC

0^oC

32^oC

-32^oC

Conductors: (i), (ii), (vi)

Insulators: (iii), (iv), (v)

Conductors: (i), (ii)

Insulators: (iii), (iv), (v), (vi)

Conductors: (i), (ii), (iv), (vi)

Insulators: (iii), (v)

Conductors: (i), (ii), (iv)

Insulators: (iii), (v), (vi)