OAR MECHANICAL
COMPREHENSION TEST 2026
COMPLETE QUESTIONS AND
VERIFIED ANSWERS
◉ The names of the process of transferring heat from one location to
another are radiation, convection, and-
a. condensation
b. boiling
c. conduction
d. evaporation. Answer: ANSWER: C (conduction)
Conduction is the transfer of heat through direct contact between
molecules within a material - moving from hotter to cooler part of a
substance. Common in solids, especially metals.
◉ When salt is dissolved in water:
a. It decreases the boiling point
b. It increases the boiling point
c. It increases melting point
d. It decreases the specific gravity. Answer: ANSWER: B (It increases
the boiling point)
, It increases the boiling point, because of the boiling point elevation
phenomenon. The dissolved salt ions disrupt the water molecules,
making it more difficult for them to escape the vapor phase. As a result,
a higher temperature is required to reach the boiling point.
◉ When air is compressed in a closed space,
a. The volume of the air increases as a temperature decreases
b. The volume and temperature of the air decreases
c. The volume and temperature of the air increases
d. The volume of the air decreases, the temperature increases.. Answer:
ANSWER: D (The volume of the air decreases, the temperature
increases)
Because the air molecules are forced closer together, this compression
increases the pressure & increases the temp of the air, as the kinetic
energy of the molecules rises with the reduced space leading to a rise in
temperature. This is a key concept in thermodynamics and is described
by the ideal gas law.
◉ When water confined in an enclosed container is heated without
letting the steam escape, the pressure inside the container increases.
What happens to the temperature of the water while it is boiling?
a. The temperature of the water increases
COMPREHENSION TEST 2026
COMPLETE QUESTIONS AND
VERIFIED ANSWERS
◉ The names of the process of transferring heat from one location to
another are radiation, convection, and-
a. condensation
b. boiling
c. conduction
d. evaporation. Answer: ANSWER: C (conduction)
Conduction is the transfer of heat through direct contact between
molecules within a material - moving from hotter to cooler part of a
substance. Common in solids, especially metals.
◉ When salt is dissolved in water:
a. It decreases the boiling point
b. It increases the boiling point
c. It increases melting point
d. It decreases the specific gravity. Answer: ANSWER: B (It increases
the boiling point)
, It increases the boiling point, because of the boiling point elevation
phenomenon. The dissolved salt ions disrupt the water molecules,
making it more difficult for them to escape the vapor phase. As a result,
a higher temperature is required to reach the boiling point.
◉ When air is compressed in a closed space,
a. The volume of the air increases as a temperature decreases
b. The volume and temperature of the air decreases
c. The volume and temperature of the air increases
d. The volume of the air decreases, the temperature increases.. Answer:
ANSWER: D (The volume of the air decreases, the temperature
increases)
Because the air molecules are forced closer together, this compression
increases the pressure & increases the temp of the air, as the kinetic
energy of the molecules rises with the reduced space leading to a rise in
temperature. This is a key concept in thermodynamics and is described
by the ideal gas law.
◉ When water confined in an enclosed container is heated without
letting the steam escape, the pressure inside the container increases.
What happens to the temperature of the water while it is boiling?
a. The temperature of the water increases
