Thermal Properties of Matter Test

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Thermal Properties of Matter Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

Keeping the number of moles, volume and temperature the same, which of the following are the same for all ideal gases?

A
rms speed of molecules

B
Density

C
Pressure

D
Average magnitude of momentum

Solution

We have the relation PV=nRT (ideal gas equation)
by keeping the number of moles, volume and temperature same, pressure will also remains same ($$\because$$R is constant)
Question 2
1 / -0

In the steady state, the two ends of a metel rod are at $$30^oC$$ and $$20^oC$$. The temperature at the 60th cm is

A
$$22^oC$$

B
$$23^oC$$

C
$$24^oC$$

D
$$25^oC$$

Solution

Given the rod is in steady state, and of one meter length.
Temperature gradient is a constant.
$$\dfrac{dT}{dx} = c$$
$$dT = cdx$$
$$T = cx +a$$; Substituting the conditions that T(0) = 30 and T(100) = 20;
$$T = -0.1x + 30;$$
putting T(60) we get $$T(60) = -6 + 30 = 24^{\circ}C$$
Question 3
1 / -0

Thermal radiations are similar to

A
$$ \alpha $$ rays

B
X-rays

C
cathode rays

D
none of these

Solution

Thermal radiations have high wavelengths and low frequencies, this property is similar to that of X-rays.
Question 4
1 / -0

How is the velocity of thermal radiations ($$v$$) related to the velocity of light ($$c$$)?

A
$$v < c$$

B
$$v > c$$

C
$$v = c$$

D
the relation depends upon the wavelength of the radiations

Solution

Thermal radiations will transmit as electromagnetic waves. So, the velocity of thermal radiations is equal velocity of light.
option (C) is the correct answer
Question 5
1 / -0

A hot and a cold body are kept in vacuum separated from each other. Which of the following causes decrease in temperature of the hot body?

A
conduction

B
radiations

C
convection

D
the temperature of the bodies remain unchanged
Solution
There are only three forms of heat transfer:
- Conduction, but the two bodies need to be in contact
- Convection, but there needs to be a medium between them
- Radiation, this is possible even in vacuum
Hence, radiation is the only form of heat transfer possible
Question 6
1 / -0

In which part of electromagentic spectrum do the heat radiations lie?

A
visible

B
violet

C
ultraviolet

D
infrared

Solution

Heat radiations have very high wavelengths and hence they fall under infrared.
Question 7
1 / -0

The material of prism used for obtaining spectrum of heat radiations is

A
rock salt

B
quartz

C
flint glass

D
crown glass

Solution

We can't use any kinds of glass to get a heat radiation spectrum, because glass absorbs infrared radiation.
Rock salt doesn't absorb infrared radiation and hence it can be used.
Question 8
1 / -0

When water is heated from $$0^{\circ}C$$ to $$10^{\circ}C$$, its volume:

A
increases

B
decreases

C
does not changes

D
first decreases and then increases

Solution

Water exhibits an anomalous behaviour. It contracts on heating between $$0 ^{ o }{ C }$$ and $$4 ^{ o }{ C }$$ , so the volume of the water decreases. Above $$4 ^{ o }{ C
}$$ volume increases upon heating. Thus, it has highest density at $$4 ^{ o }{ C }$$
Question 9
1 / -0

Heat is transmitted from higher to lower temperature through actual mass motion of the molecules in

A
conduction

B
convection

C
radiation

D
None of these

Solution

Conduction: It is the mechanism of heat transfer in which heat is transfer takes place by vibration of molecules and molecules will not leave their original position.
Convection: It is a mode of heat transfer by actual motion of mass. It is possible only in fluids.
Radiation: It does not require any medium to transfer heat. It transfers heat by electromagnetic waves
option (B) is the correct answer
Question 10
1 / -0

For a liquid, the coefficients of apparent expansion '$${\gamma}_{a}$$ 'and real expansion '$${\gamma}_{r}$$' are related as:

A
$${\gamma}_{a}={\gamma}_{r}$$

B
$${\gamma}_{a}<{\gamma}_{r}$$

C
$${\gamma}_{a}>{\gamma}_{r}$$

D
$$\displaystyle\frac{{\gamma}_{a}}{{\gamma}_{r}}=constant$$

Solution

$$\gamma_r=\gamma_a + \gamma_g$$ where;
$$\gamma_r$$ is the real expansion,$$\gamma_a$$ is the apparent expansion and $$\gamma_g$$ is the expansion of the vessel. Hence, $$\gamma_a < \gamma_r$$

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Re-Attempt Weekly Quiz Competition

Thermal Properties of Matter Test - 13

Result

Thermal Properties of Matter Test - 13

Score

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SHARING IS CARING

Question 1

rms speed of molecules

Density

Pressure

Average magnitude of momentum

Solution

Question 2

$$22^oC$$

$$23^oC$$

$$24^oC$$

$$25^oC$$

Solution

Question 3

$$ \alpha $$ rays

X-rays

cathode rays

none of these

Solution

Question 4

$$v < c$$

$$v > c$$

$$v = c$$

the relation depends upon the wavelength of the radiations

Solution

Question 5

conduction

radiations

convection

the temperature of the bodies remain unchanged

Solution

Question 6

visible

violet

ultraviolet

infrared

Solution

Question 7

rock salt

quartz

flint glass

crown glass

Solution

Question 8

increases

decreases

does not changes

first decreases and then increases

Solution

Question 9

conduction

convection

radiation

None of these

Solution

Question 10

$${\gamma}_{a}={\gamma}_{r}$$

$${\gamma}_{a}<{\gamma}_{r}$$

$${\gamma}_{a}>{\gamma}_{r}$$

$$\displaystyle\frac{{\gamma}_{a}}{{\gamma}_{r}}=constant$$

Solution

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