Heat, thermodynamics and fluids

A gas absorbs 500 J of heat and does 200 J of work. What is the change in its internal energy?

• 1 200 J
• 2 300 J
• 3 500 J
• 4 700 J

What pressure does a force of 100 N exert on an area of 0.5 m2?

• 1 50 Pa
• 2 200 Pa
• 3 500 Pa
• 4 20 Pa

How much heat is needed to raise the temperature of 2 kg of water by 5 degrees C? (Specific heat of water = 4200 J/kg per degree C)

• 1 4200 J
• 2 21000 J
• 3 42000 J
• 4 84000 J

Absolute zero is:

• 1 0 degrees C
• 2 -100 degrees C
• 3 -273.15 degrees C
• 4 -373 degrees C

According to Bernoulli's principle, in a horizontal flow of a fluid, where the speed is higher:

• 1 The pressure is higher
• 2 The pressure is lower
• 3 The pressure is unchanged
• 4 The density increases

Archimedes' principle says that the upthrust on a body in a fluid equals:

• 1 The weight of the body
• 2 The weight of the fluid displaced
• 3 The volume of the body only
• 4 The density of the fluid