Thermal Properties of Matter Test

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Thermal Properties of Matter Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

When water is heated from $$0^\circ C$$, its volume will

A
decrease till $$4^\circ C$$ then increase

B
decrease till $$4^\circ C$$

C
remain the same

D
first increase then decrease

Solution

the volume of water decreases till 4∘C and then it increases due to anomalous behaviour
Question 2
1 / -0

In convection currents, heat is transferred upwards

A
horizontally

B
diagonally

C
vertically

D
none of these

Solution

Convection is mode of heat transfer in which medium particles moves while transferring the heat. ex- Process of Heating of water; water molecules near the bottom areas of container takes heat and rise the top at the same time another water molecules come down. this goes continuously and water get warm. this phenomena of heat transfer is called convection heat transfer. and heat current flow from bottom to top ie vertically upward.
Question 3
1 / -0

By the process of convection the transfer of heat is always-

A
upwards

B
downwards

C
sideways

D
in all possible directions

Solution

By the process of convection the transfer of heat is always upwards.
Liquid and gases are bad conductors of heat. They are heated mainly by the process of convection. Solids can't be heated by the process of convection, In the process of convection the transfer of heat is always vertically upwards.
Question 4
1 / -0

When surface water in a lake is just going to freeze, then what is the temperature of water at the bottom?

A
Less than $$0^{\circ} C$$

B
$$0^{\circ}C$$

C
$$4^{\circ}C$$

D
More than $$4^{\circ} C$$

Solution

Explanation:
$$\bullet$$During the freezing of the water, cold water that turns into ice comes on top of the surface while warm water goes down.
$$\bullet$$Water’s freezing temperature is 0°C. So, warm water which is at below than top of the surface, should have more density. Water’s density is more at 4°C than at 0°C . So, temperature will be 4°C.

$$Answer:$$

Hence, option C is the correct answer.
Question 5
1 / -0

The continuous movement of a fluid when heated is called :

A
convectional current

B
conduction current

C
electric current

D
magnetic current

Solution

Convection is a process of transfer of heat through a fluid (liquid or gas) caused by molecular motion. When the particles of the medium get heated and move up and the cooler particles come down to take their place, then they get heated and move up, and a continuous movement of fluid takes place as long as the source of heat is there, then its called a convectional current.
Question 6
1 / -0

The most commonly used themometric substance is

A
water

B
alcohol

C
mercury

D
none of these

Solution

Coefficient of thermal expansion mercury is adequate. Mercury follows laws of thermal expansion ideally due to which it is used in thermometers.
Question 7
1 / -0

Absolute zero temperature corresponds to

A
$$-273\:K$$

B
-$$273^\circ C$$

C
$$273^\circ C$$

D
none of these

Solution

absolute zero temp. = 0 K or -273∘C
Question 8
1 / -0

Absolute zero corresponds to

A
-273 K

B
273$$^o$$C

C
273$$^o$$R

D
none of these

Solution
Question 9
1 / -0

The rate at which a body radiates heat depends on-

A
its temperature

B
its colour

C
its nature (dull or shiny)

D
all of these

Solution

The rate at which body radiates depends upon its nature (shiny or dull).
Nature represents emmisivity of body (radiation emittence) and absorptivity of medium (radiation absorptance of medium compared to black body).
Question 10
1 / -0

The only liquid which is a good conductor of heat is-

A
water

B
turpentine

C
alcohol

D
mercury

Solution

The liquid which is good conductor of heat is mercury.
Thermal conductivity is $$8.30W/(mK)$$ of mercury.

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Re-Attempt Weekly Quiz Competition

Thermal Properties of Matter Test - 17

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Thermal Properties of Matter Test - 17

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SHARING IS CARING

Question 1

decrease till $$4^\circ C$$ then increase

decrease till $$4^\circ C$$

remain the same

first increase then decrease

Solution

Question 2

horizontally

diagonally

vertically

none of these

Solution

Question 3

upwards

downwards

sideways

in all possible directions

Solution

Question 4

Less than $$0^{\circ} C$$

$$0^{\circ}C$$

$$4^{\circ}C$$

More than $$4^{\circ} C$$

Solution

Question 5

convectional current

conduction current

electric current

magnetic current

Solution

Question 6

water

alcohol

mercury

none of these

Solution

Question 7

$$-273\:K$$

-$$273^\circ C$$

$$273^\circ C$$

none of these

Solution

Question 8

-273 K

273$$^o$$C

273$$^o$$R

none of these

Solution

Question 9

its temperature

its colour

its nature (dull or shiny)

all of these

Solution

Question 10

water

turpentine

alcohol

mercury

Solution

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