Kinetic Theory and First Law of Thermodynamics MCQs

Question 1

When ice is put in a drink, energy flows:

Accepted Answer

from the drink to the ice

Answer

from the ice to the drink

Answer

in neither direction

Answer

from the glass to the room only

Question 2

The pressure of a gas, from kinetic theory, is:

Accepted Answer

p = 13rhooverlinec^2

Answer

p = 3rhooverlinec^2

Answer

p = 12rho c

Answer

p = rho gh

Question 3

In an adiabatic expansion, the work done by the gas comes from:

Accepted Answer

its internal energy (it cools)

Answer

heat supplied

Answer

the surroundings' heat

Answer

nowhere

Question 4

The first law of thermodynamics expresses conservation of energy because:

Accepted Answer

heat supplied = increase in internal energy + work done; no energy is created or destroyed

Answer

it says entropy increases

Answer

it defines temperature

Answer

it says heat always flows hot to cold

Question 5

A gas at 2 10^5 Pa and 300 K occupies 0.01 m^3. The amount of gas is:

Accepted Answer

0.802 mol

Answer

8.02 mol

Answer

1.6 mol

Answer

0.401 mol

Question 6

The internal energy of a gas can be increased by:

Accepted Answer

heating it or doing work on it

Answer

only heating it

Answer

only cooling it

Answer

only letting it expand

Question 7

An ideal gas is heated from 300 K to 600 K. The average kinetic energy of its molecules is multiplied by:

Accepted Answer

2

Answer

0.5

Answer

4

Answer

1.41

Question 8

When ice melts at 0 °C, its internal energy:

Accepted Answer

increases although its temperature stays constant

Answer

decreases

Answer

stays the same

Answer

becomes zero

Question 9

The formula W = pDelta V is valid when:

Accepted Answer

the pressure is constant

Answer

the gas is a liquid

Answer

the temperature is zero

Answer

the volume is constant

Question 10

5 10^22 molecules of an ideal gas at 400 K fill 0.002 m^3. The pressure is (k = 1.38 10^-23 J/K):

Accepted Answer

1.38 10^5 Pa

Answer

1.38 10^6 Pa

Answer

2.76 10^5 Pa

Answer

13,800 Pa

Question 11

According to kinetic theory, raising the temperature of a gas:

Accepted Answer

increases the mean speed of its molecules

Answer

increases the size of the molecules

Answer

decreases the mean speed

Answer

stops molecular motion

Question 12

When 1000 J of heat is supplied to a gas which does 400 J of work, the 'missing' 600 J:

Accepted Answer

is stored as increased internal energy

Answer

is destroyed

Answer

becomes mass

Answer

is lost as light

Question 13

The first law treats heat and work as:

Accepted Answer

two ways of transferring energy

Answer

the same as temperature

Answer

forms of mass

Answer

unrelated quantities

Question 14

Heating a metal rod increases the amplitude of atomic vibrations. This shows:

Accepted Answer

increased internal energy with temperature

Answer

decreased internal energy

Answer

loss of mass

Answer

a change of state

Question 15

When a gas does work by expanding (with no heat flow), its temperature:

Accepted Answer

falls

Answer

doubles

Answer

rises

Answer

stays the same

Question 16

Points A (p = 100 kPa, V = 3 L) and B (p = 150 kPa, V = 2 L) lie on the same:

Accepted Answer

isotherm (same pV)

Answer

adiabatic line

Answer

isochore

Answer

isobar

Question 17

The internal energy of 2 mol of a monatomic ideal gas is U = 32nRT. When it is heated from 250 K to 350 K, its internal energy increases by:

Accepted Answer

2490 J

Answer

1250 J

Answer

4990 J

Answer

1660 J

Question 18

Two bodies are in thermal equilibrium when:

Accepted Answer

they are at the same temperature, so there is no net heat flow between them

Answer

they are made of the same material

Answer

they have the same mass

Answer

they have the same internal energy

Question 19

The value of the Boltzmann constant is approximately:

Accepted Answer

1.38 10^-23 J/K

Answer

8.31 J mol^-1 K^-1

Answer

6.63 10^-34 J s

Answer

6.02 10^23 mol^-1

Question 20

Which equation contains the Boltzmann constant?

Accepted Answer

pV = NkT

Answer

E = mc^2

Answer

pV = nRT

Answer

F = ma

Question 21

A gas at constant pressure 2 10^5 Pa changes volume from 0.01 m^3 to 0.025 m^3. The work done by the gas is:

Accepted Answer

3000 J

Answer

-3000 J

Answer

30,000 J

Answer

300 J

Question 22

A gas is compressed at constant pressure. The work done by the gas is:

Accepted Answer

negative

Answer

positive

Answer

infinite

Answer

zero

Question 23

In a Boyle's law experiment, the gas is compressed slowly so that:

Accepted Answer

its temperature stays constant

Answer

it heats up

Answer

its volume stays constant

Answer

it leaks out

Question 24

In terms of particles, the pressure law (p propto T) arises because at higher T:

Accepted Answer

both the rate and force of collisions increase

Answer

molecules collide less

Answer

only the number of molecules increases

Answer

the walls move outward

Question 25

When a gas expands against a piston, work is done:

Accepted Answer

by the gas on the surroundings

Answer

by nobody

Answer

on the gas by the surroundings

Answer

only on the container walls

Kinetic Theory and First Law of Thermodynamics MCQs — Physics (page 2)

26. When ice is put in a drink, energy flows:

27. The pressure of a gas, from kinetic theory, is:

28. In an adiabatic expansion, the work done by the gas comes from:

29. The first law of thermodynamics expresses conservation of energy because:

30. A gas at 2 10^5 Pa and 300 K occupies 0.01 m^3. The amount of gas is:

31. The internal energy of a gas can be increased by:

32. An ideal gas is heated from 300 K to 600 K. The average kinetic energy of its molecules is multiplied by:

33. When ice melts at 0 °C, its internal energy:

34. The formula W = pDelta V is valid when:

35. 5 10^22 molecules of an ideal gas at 400 K fill 0.002 m^3. The pressure is (k = 1.38 10^-23 J/K):

36. According to kinetic theory, raising the temperature of a gas:

37. When 1000 J of heat is supplied to a gas which does 400 J of work, the 'missing' 600 J:

38. The first law treats heat and work as:

39. Heating a metal rod increases the amplitude of atomic vibrations. This shows:

40. When a gas does work by expanding (with no heat flow), its temperature:

41. Points A (p = 100 kPa, V = 3 L) and B (p = 150 kPa, V = 2 L) lie on the same:

42. The internal energy of 2 mol of a monatomic ideal gas is U = 32nRT. When it is heated from 250 K to 350 K, its internal energy increases by:

43. Two bodies are in thermal equilibrium when:

44. The value of the Boltzmann constant is approximately:

45. Which equation contains the Boltzmann constant?

46. A gas at constant pressure 2 10^5 Pa changes volume from 0.01 m^3 to 0.025 m^3. The work done by the gas is:

47. A gas is compressed at constant pressure. The work done by the gas is:

48. In a Boyle's law experiment, the gas is compressed slowly so that:

49. In terms of particles, the pressure law (p propto T) arises because at higher T:

50. When a gas expands against a piston, work is done:

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