1
MCQ (Single Correct Answer)

AIPMT 2008

If a gas expands at constant temperature, it indicates that
A
kinetic energy of molecules remains the same
B
number of the molecules of gas increases
C
kinetic energy of molecules decreases
D
pressure of the gas increases.

Explanation

Kinetic energy of a gas is expressed as

K.E = $${3 \over 2}nRT$$

Thus, on expansion of fixed amount of gas at constant temperature the kinetic energy remains constant.
2
MCQ (Single Correct Answer)

AIPMT 2002

Van der Waal's real gas, acts as an ideal gas, at which conditions?
A
High temperature, low pressure
B
Low temperature, high pressure
C
High temperature, high pressure
D
Low temperature, low pressure

Explanation

At higher temperature and low pressure real gas acts as an ideal gas.
3
MCQ (Single Correct Answer)

AIPMT 2001

The beans are cooked earlier in pressure cooker because
A
boiling point increases with increasing pressure
B
boiling point decreases with increasing pressure
C
extra pressure of pressure cooker softens the beans
D
internal energy is not lost while coocking in pressure cooker.

Explanation

When water pressure increases in the pressure cooker, water boils at lower temperature and the beans in pressure cooker are cooked earlier.
4
MCQ (Single Correct Answer)

AIPMT 2000

Which of the following expressions correctly represents the relationship between the average molar kinetic energy, KE, of CO and N2 molecules at the same temperature ?
A
KECO = KEN2
B
KECO > KEN2
C
KECO < KEN2
D
cannot be predicted unless volumes of the gases are given

Explanation

Average molar kinetic energy = $${3 \over 2}nRT$$

As temperature is same hence average kinetic energy of CO and N2 will be same.

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