Thermal Properties of Matter Test

Result

Thermal Properties of Matter Test - 61

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Question 1
1 / -0

The temperature below which a gas should be cooled, before it can be liquified by pressure only is termed as

A
The dew point

B
The freezing point

C
The saturation point

D
The critical point

Solution

Critical temperature is the temperature of a gas in its critical state, above which it cannot be liquefied by pressure alone. Critical pressure is the pressure of gas corresponds to its critical state.
Thus option (𝗗) is correct.
Question 2
1 / -0

The velocity of heat radiation in vacuum is

A
Equal to that of light

B
Less than that of light

C
Greater than that of light

D
Equal to that of sound

Solution

The velocity of heat radiation in the vacuum is $$equal$$ to that of light.
Question 3
1 / -0

Four rods of identical cross-sectional area and made from the same the metal form the sides of square. The temperature of two diagonally opposite points and $$T$$ and $$2T$$ respective in the steady-state. Assuming that only heat conduction takes place, what will be the temperature difference between the other two points

A
$$\dfrac{\sqrt{2}+1}{2}T$$

B
$$\dfrac{2}{\sqrt{2}+1}T$$

C
$$0$$

D
None of these

Solution
Question 4
1 / -0

A thermos flask is polished well

A
To make attractive

B
For shining

C
To absorb all radiations from outside

D
To reflect all radiations from outside

Solution

The polished surface reflects all the radiation. And a thermos flask is used to keep the heat out so the well-polished surface reflects all radiation from outside.
Question 5
1 / -0

Three rods of the same dimension have thermal conductivities 3K,2K. The temperature of their junction is

A
$$60 ^\circ C$$

B
$$70 ^\circ C$$

C
$$50 ^\circ C$$

D
$$35 ^\circ C$$

Solution

Let the temperature of junction be θ then according to the following figure.
$$H=H_1+H_2$$
$$\dfrac{3K \times A(100-\theta)}{l}=\dfrac{2KA(\theta-50)}{l}+\dfrac{2KA(\theta-20)}{l}$$\
$$300-3 \theta=3 \theta -120$$
$$\theta=70$$
Question 6
1 / -0

At constant volume the specific heat of a gas is $$ \dfrac{3R}{2} $$ , then the value of $$\gamma $$ will be

A
$$ \dfrac{3}{2}$$

B
$$ \dfrac{5}{2} $$

C
$$ \dfrac{5}{3} $$

D
None of these

Solution
Question 7
1 / -0

At a given volume and temperature , the pressure of a gas

A
Varies inversely as its mass

B
Varies inversely as the square of its mass

C
Varies linearly as its mass

D
Is independent of its mass

Solution
Question 8
1 / -0

At NTP the mass of one litre of air is $$1.293\,gm$$. The value of specific gas constant will be

A
$$0.29\,J/K-gm$$

B
$$4.2\,J/K-gm$$

C
$$8.3\,J/K-gm$$

D
$$16.5\,J-gm$$

Solution
Question 9
1 / -0

For matter to exist simultaneously in gas and liquid phases

A
The temperature must be $$0\,K$$

B
The temperature must be less than $$0^{\circ}\,C$$

C
The temperature must be less than the critical temperature

D
The temperature must be less than the reduced temperature

Solution
Question 10
1 / -0

Beryllium has roughly one-half the specific heat of water $$(H_2O)$$. Rank the quantities of energy input required to produce the following changes from the largest to the smallest. In your ranking, note any cases of equality.

A
raising the temperature of 1 kg of $$H_2O$$ from $$20^0C$$ to $$26^0C$$

B
raising the temperature of 2 kg of $$H_2O$$ from $$20^0C$$ to $$23^0C$$

C
raising the temperature of 2 kg of $$H_2O$$ from $$1^0C$$ to $$4^0C$$

D
raising the temperature of 2 kg of $$H_2O$$ from $$1^0C$$ to $$4^0C$$

E
raising the temperature of 2 kg of $$H_2O$$ from $$21^0C$$ to $$2^0C$$

Solution

Rankings (e) >(a) =(b) =(c) > (d). We think of the product $$mc\Delta T$$ in each case, with c =1 for water and about 0.5 for beryllium: (a) 1. 1. 6 =6, (b) 2. 1. 3 =6, (c) 2. 1. 3 =6, (d) 2(0.5)3 =3, (e) >6 because a large quantity of energy input is required to melt the ice.