Thermal Properties of Matter Test

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Thermal Properties of Matter Test - 16

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Question 1
1 / -0

When water is heated from $$0^{\circ}C$$ to higher temperatures, its volume

A
increases

B
decreases till $$4^{\circ}C$$ and then increases

C
remains the same

D
first increases then decreases

Solution

At zero degree water is in its solid form.
As the temperature increases from $$0^o$$ to $$4^o$$, we notice that the volume is decreasing. At $$4^oC$$, a given amount of water has the smallest volume that means it has highest density at this point.
If the temperature is bigger than $$4^o$$, the volume of water will start increasing and as a result the water will be less dense. If the temperature is between $$0^oC$$ to $$4^oC$$, the water will increase in volume and become less dense.
Question 2
1 / -0

The value of gas constant $$R$$ (in cal/mol-K) for hydrogen is :

A
$$\displaystyle\frac{1}{2}$$

B
$$2 $$

C
$$4$$

D
$$1 $$

Solution

Numerical Values of the Gas Constant, R in Varius Units
Units Numerical Value
L-atm / mol-K 0.08206
cal/mol-K 1.987
J/mol-K 8.314
$$m^3$$-Pa/mol-K 8.314
L-torr/mol-K 62.36
It is approximately $$2 cal/mole-Kelvin $$. We can convert the 8.314 SI units to calories units by simply converting the units to their respective required units.
Question 3
1 / -0

The speed at which heat energy is propagated in vacuum is approximately :

A
$$3 \times {10}^{-8} {m}/{s}$$

B
$$3 {m}/{s}$$

C
$$3 \times {10}^{8} {m}/{s}$$

D
$$3 \times {10}^{10} {m}/{s}$$

Solution

In vacuum, there is no medium therefore heat energy is propagated by radiation (conduction and convection are not possible), which travels at the speed of $$3\times10^{8}m/s$$ in vacuum .
Question 4
1 / -0

The radiation of an electric room heater is most effective when it is :

A
uncleaned

B
polished to shine

C
painted green

D
painted black

Solution

Highly polished heater takes a longer time to cool down than one of the same size with a rough dark surface.
Question 5
1 / -0

The temperature, to which a gas must be cooled before it can be liquified by pressure alone, is known as its

A
Saturation point

B
Freezing point

C
Liquification temperature

D
critical temperature

Solution

The temperature, to which a gas must be cooled before it can be liquified by pressure alone, is known as its critical temperature.
Question 6
1 / -0

The air becomes heated by

A
Conduction

B
Convection

C
Radiation

D
Expansion

E
Diffusion

Solution

Convection is a mode of heat transfer where the molecules near the heat source get heated up. They absorb energy, expand, become less dense, and rise upwards.

On the other hand, the relatively colder molecules sink to the bottom and eventually get heated up again. Thus air gets heated by convection.
Question 7
1 / -0

Essential requirement to propagation Heat energy:

A
no medium

B
gaseous medium

C
solid medium

D
liquid medium

Solution

Heat energy can propagate by radiation, which is a mode of propagation of heat energy. Radiation doesn't require any medium hence heat energy essentially requires no medium for propagation .
Question 8
1 / -0

Water in a container is heated from $$0^{\circ}$$ to $$10^{\circ}C$$. Its volume :

A
increases for the full given range (from $$0^{\circ}$$ to $$10^{\circ}C$$)

B
decreases up to $$4^{\circ}$$, then increases

C
increases up to $$4^{\circ}C$$, then decreases

D
decreases for the full range (from $$0^{\circ}$$ to $$10^{\circ}C$$)

Solution

As water has maximum density at $$4^oC$$. So going from $$0^oC$$ to $$10^oC$$.
First its volume decreases upto $$4^oC$$, making density maximum and then increases to lower the density again.
Question 9
1 / -0

Transmission of heat by the movement of heated particles is called

A
Conduction

B
Convection

C
Radiation

D
Regelation

E
Expansion

Solution

Convection is a mode of heat transfer in which the molecules near the heat source get heated up, expand, become less dense, and rise upwards. But the relatively colder molecules sink to the bottom and eventually get heated up. Thus the transmission of heat by the movement of heated particles is called convection.
Question 10
1 / -0

The most commonly used thermometric substance is

A
water

B
alcohol

C
mercury

D
none of these

Solution

1) It expands uniformly when heated.
2) It has low specific heat capacity.
3) It has a high boiling point (357℃) and a low freezing point (-39℃)
4) It is a good conductor of heat.
5) It does not stick to the walls of the glass tube.
6) It is opaque and shiny and hence clearly visible.
7) It is available in pure form.

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Re-Attempt Weekly Quiz Competition

Units	Numerical Value
L-atm / mol-K	0.08206
cal/mol-K	1.987
J/mol-K	8.314
$$m^3$$-Pa/mol-K	8.314
L-torr/mol-K	62.36

Thermal Properties of Matter Test - 16

Result

Thermal Properties of Matter Test - 16

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Question 1

increases

decreases till $$4^{\circ}C$$ and then increases

remains the same

first increases then decreases

Solution

Question 2

$$\displaystyle\frac{1}{2}$$

$$2 $$

$$4$$

$$1 $$

Solution

Question 3

$$3 \times {10}^{-8} {m}/{s}$$

$$3 {m}/{s}$$

$$3 \times {10}^{8} {m}/{s}$$

$$3 \times {10}^{10} {m}/{s}$$

Solution

Question 4

uncleaned

polished to shine

painted green

painted black

Solution

Question 5

Saturation point

Freezing point

Liquification temperature

critical temperature

Solution

Question 6

Conduction

Convection

Radiation

Expansion

Diffusion

Solution

Question 7

no medium

gaseous medium

solid medium

liquid medium

Solution

Question 8

increases for the full given range (from $$0^{\circ}$$ to $$10^{\circ}C$$)

decreases up to $$4^{\circ}$$, then increases

increases up to $$4^{\circ}C$$, then decreases

decreases for the full range (from $$0^{\circ}$$ to $$10^{\circ}C$$)

Solution

Question 9

Conduction

Convection

Radiation

Regelation

Expansion

Solution

Question 10

water

alcohol

mercury

none of these

Solution

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