Thermal Properties of Matter Test

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Thermal Properties of Matter Test - 22

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Weekly Quiz Competition

Question 1
1 / -0

A gas behaves more closely as an ideal gas at :

A
low pressure and low temperature

B
low pressure and high temperature

C
high pressure and low temperature

D
high pressure and high temperature

Solution

(B):
Condition for gas to behave like ideal gas :

(1) pressure should be lower so gases can move independently.
(2) The temperature should be high so that the kinetic energy of gases can overcome the interaction among molecules.
It satisfies the equation of state.
Question 2
1 / -0

The propagation of heat in vacuum takes place by

A
Conduction

B
Convection

C
Radiation

D
None of these

Solution

In vacuum there have no material medium. So Heat transfer only takes place by Radiation only.
Question 3
1 / -0

Which of the following carries anomalous expansion ?

A
Mercury

B
Water

C
Copper

D
Sodium

Solution

(B)Water
Anomalous expansion is from $$4^oc$$ to $$0^0c$$ which generally expected to be contraction for other liquid as we are moving from liquid to solid region
Question 4
1 / -0

Thermal radiation are

A
Electromagnetic wave

B
Mechanical transverse wave

C
Mechanical longitudinal wave

D
None of the above

Solution

All types of radiation produce electromagnetic wave with different wavelength.
Hence option: A
Question 5
1 / -0

Every gas (real gas ) behaves as an ideal gas

A
At high temperature and low pressure

B
At low temperature and high pressure

C
At normal temperature

D
None of the above

Solution

Generally, a gas behaves more like an ideal gas at higher temperature and lower pressure, as the potential energy due to intermolecular forces becomes less significant compared with the particles' kinetic energy, and the size of the molecules becomes less significant compared to the empty space between them.
Question 6
1 / -0

Absolute temperature can be calculated by

A
Mean square velocity

B
Motion of the molecule

C
Both (a) and (b)

D
None of the above

Solution

Absolute temperature is proption to Mean square velocity.
and independent of motion of molecule.
$$\overset{-}{v^2} \propto T$$
Hence option A is correct
Question 7
1 / -0

A glass is full of water at $$4^{0}C$$ when it is (a) cooled (b) heated. Then, which one of the following is correct?

A
water level decreases, increases

B
water level increases, decreases

C
water level decreases, decreases

D
water over flow in both cases

Solution

When heated above $$4^0$$C, volume will increase, hence it will overflow.
When cooled below $$4^0$$C, it also expands and volume increases( anomalous expansion) until $$0^0$$C.
Hence, in both cases it will overflow.
Question 8
1 / -0

The graph between temperature and pressure of a perfect gas is

A
hyperbola.

B
parabola.

C
a straight line parallel to pressure axes at $$73^{0}C$$.

D
a straight line intercepting the temperature axes at $$273^{0}C$$.

Solution

From ideal gas equation, PV = nRT
so P-T curve at constant volume is a straight line.
If the temperature is written in Kelvin, it turns out that the intercept is at 273
Question 9
1 / -0

The graph drawn between pressure and temperature at constant volume for a given mass of different molecular weights $$M_{1}$$ and $$M_{2}$$ are the straight lines as shown in the figure then

A
$$M_{2} > M_{1}$$

B
$$M_{1} > M_{2}$$

C
$$M_{1} = M_{2}$$

D
$$M_{1}^{3} = M_{2}$$

Solution

From ideal gas equation, PV = nRT = $$\frac{w}{M}RT$$
Slope of P-T curve = $$\frac{wR}{MV}$$
Since V = constant and w = constant, we get that the slope is inversely proportional to molecular weight
Steeper the line, more is slope, less is molecular weight.
So, $$M_{1} > M_{2}$$
Question 10
1 / -0

All gasses deviate from gas laws at

A
high pressure and low temperature.

B
low pressure and high temperature.

C
high pressure and high temperature.

D
low pressure and low temperature.

Solution

At high pressure and low temperature, the molecular interaction terms become significant.
So, we cannot neglect these terms.
Also, the total size of molecules becomes significant at low temperatures.
So, at low temperature and high pressure, there is a significant deviation from ideal gas equation.

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Thermal Properties of Matter Test - 22

Result

Thermal Properties of Matter Test - 22

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Question 1

low pressure and low temperature

low pressure and high temperature

high pressure and low temperature

high pressure and high temperature

Solution

Question 2

Conduction

Convection

Radiation

None of these

Solution

Question 3

Mercury

Water

Copper

Sodium

Solution

Question 4

Electromagnetic wave

Mechanical transverse wave

Mechanical longitudinal wave

None of the above

Solution

Question 5

At high temperature and low pressure

At low temperature and high pressure

At normal temperature

None of the above

Solution

Question 6

Mean square velocity

Motion of the molecule

Both (a) and (b)

None of the above

Solution

Question 7

water level decreases, increases

water level increases, decreases

water level decreases, decreases

water over flow in both cases

Solution

Question 8

hyperbola.

parabola.

a straight line parallel to pressure axes at $$73^{0}C$$.

a straight line intercepting the temperature axes at $$273^{0}C$$.

Solution

Question 9

$$M_{2} > M_{1}$$

$$M_{1} > M_{2}$$

$$M_{1} = M_{2}$$

$$M_{1}^{3} = M_{2}$$

Solution

Question 10

high pressure and low temperature.

low pressure and high temperature.

high pressure and high temperature.

low pressure and low temperature.

Solution

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