Heat Test

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Heat Test - 10

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Weekly Quiz Competition

Question 1
1 / -0

Two layers of cloth of equal thickness provide warmer covering than a single layer of cloth of double the thickness, because they :

A
behave like a thermos

B
have lesser thickness

C
allow heat from atmosphere to the body

D
enclose between them a layer of air

Solution

Air is a bad conductor of heat, hence if layer of air is isolated between two layers of cloth, warmer covering will be provided than if only one layer of cloth, where only body is isolated from surrounding air by cloth.
Question 2
1 / -0

When a body has the same temperature as that of its surroundings :

A
It does not radiate heat

B
It radiates same quantity of heat as it receives from the surroundings

C
It radiates less quantity of heat as it receives from the surroundings

D
It radiates more quantity of heat as it receives from the surroundings.

Solution

Since the body has the same temperature as that of surrounding, it is in thermal equilibrium with the surroundings.
So, there is no net exchange of heat.
So, amount of heat radiated = amount of heat received from the surroundings.
Question 3
1 / -0

Which of the following methods of flow of heat is (are) based on gravitational attraction?

A
Conduction

B
Convection

C
Radiation

D
All of these

Solution

Convectional currents that are set up in vessels having considerable height, work on the principle that cooler, denser water tries to move downwards on account of its larger weight while the water closer to the heater i.e. the water at lower height gets heated up and tries to move upwards on account of lower weight.
Question 4
1 / -0

In a room containing air, heat can go from one place to another by :

A
conduction

B
convection

C
radiation

D
all of these

Solution

Heat can travel by conduction as material medium is available as wall.
Heat can travel by convection as material medium is available as air.
Heat can travel by radiation as no material medium is needed.
Question 5
1 / -0

Assertion (A): Woolen clothes keep the body warm in winter
Reason (R): Air is bad conductor of heat

A
Both A and R are true,

B
Both A and R are false

C
Both A and R are true, R is correct explanation of A

D
Both A and R are true, R is not correct explanation of A

Solution

Woollen clothes effectively separate the body from surrounding air by entrapping a layer of air.
Since both wool and air are bad conductors of heat on varying levels, it creates separation that keeps bodies warm.
Question 6
1 / -0

A) Heat transfer by conduction and convection require a material medium.
B) Heat transfer by radiation doesn't require a material medium.

A
both A and B are true

B
A is true but B is false

C
B is true but A is false

D
both A and B are false

Solution

Conduction and convection are processes where heat is transferred by the collision of molecules. Hence, for these processes to take place, we need a material medium.
In radiation, heat travels as electromagnetic waves which do not require a medium to travel. Its transfer mechanism is completely independent of the medium.
Question 7
1 / -0

In the following, which statement is correct :
a) A hot body emits hot radiations only.
b) A cold body absorbs the radiations only.
c) A cold body emits cold radiations only.
d) All the bodies emit and absorb radiations simultaneously.

A
a

B
b

C
c

D
d

Solution

Since, we know that, Above zero kelvin, all the bodies emit and absorb radiations simultaneously.
Therefore, "All the bodies emit and absorb radiations simultaneously" is the correct statement.
Question 8
1 / -0

Celsius is a unit of :

A
Temperature

B
Heat

C
Specific heat

D
Latent heat

Solution

A thermometer is a device that we use to measure temperature of the given body. A rise in temperature of the body causes a change in property of the substance and we use this to measure temperature. The unit of measuring temperature is celsius,

The Centigrade (Celsius) Scale: This scale has lower fixed point as the melting point of ice and upper fixed point as boiling point of water and between the two points is divided into 100 equal parts.
Question 9
1 / -0

The range of clinical thermometer is:

A
$$35^{\circ}C$$ to $$42^{\circ}C$$

B
$$35^{\circ}F$$ to $$42^{\circ}F$$

C
$$90^{\circ}F$$ to $$112^{\circ}F$$

D
$$90^{\circ}C$$ to $$112^{\circ}C$$

Solution

The clinical thermometer is a specially designed thermometer to measure body temperature. The range of a clinical thermometer is centered around the human body temperature which is from $$35^\circ C$$ to $$42^\circ C$$.
Question 10
1 / -0

Radiation is passing through a transparent medium, then :

A
the temperature of medium increases

B
the temperature of medium decreases

C
the temperature of medium does not alter

D
the temperature of medium first increases and then becomes steady

Solution

Opacity affects radiation; Transparency which is essentially lacks opacity actually allows radiation through it.
Hence, the temperature doesn't alter.

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Re-Attempt Weekly Quiz Competition

Heat Test - 10

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Heat Test - 10

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SHARING IS CARING

Question 1

behave like a thermos

have lesser thickness

allow heat from atmosphere to the body

enclose between them a layer of air

Solution

Question 2

It does not radiate heat

It radiates same quantity of heat as it receives from the surroundings

It radiates less quantity of heat as it receives from the surroundings

It radiates more quantity of heat as it receives from the surroundings.

Solution

Question 3

Conduction

Convection

Radiation

All of these

Solution

Question 4

conduction

convection

radiation

all of these

Solution

Question 5

Both A and R are true,

Both A and R are false

Both A and R are true, R is correct explanation of A

Both A and R are true, R is not correct explanation of A

Solution

Question 6

both A and B are true

A is true but B is false

B is true but A is false

both A and B are false

Solution

Question 7

a

b

c

d

Solution

Question 8

Temperature

Heat

Specific heat

Latent heat

Solution

Question 9

$$35^{\circ}C$$ to $$42^{\circ}C$$

$$35^{\circ}F$$ to $$42^{\circ}F$$

$$90^{\circ}F$$ to $$112^{\circ}F$$

$$90^{\circ}C$$ to $$112^{\circ}C$$

Solution

Question 10

the temperature of medium increases

the temperature of medium decreases

the temperature of medium does not alter

the temperature of medium first increases and then becomes steady

Solution

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