The document contains multiple choice questions about fluids, pressure, heat transfer, temperature, energy conservation, and electric charges. It tests knowledge on topics like which substance is not a fluid, how to avoid sinking in snow, statements about atmospheric pressure, hydraulic systems, floating balls, forms of energy transfer, temperature differences and object heat exchange, energy conservation in isolated systems, how the sun warms the earth, and the definition of a negatively charged object. The questions have single correct answers that are circled on the answer sheet.

1. Part1. Multiple-choice questions. Cirdle you answers directly on the data sheet. No scantron
please. 1. Which of the following substances is NOT a fluid? a. a cup of hot chocolateb. a
chocolate spray achocolate bar 2. To avoid sink into deep snow, one should reduce contact area
b. add more weight c.reduce pressure a. 3. What statement about the atmospheric pressure is
FALSE? a. It is smaller at the top of a mountain than at its foothil. b. It is due to the air weight on
top of us. c. When falling from the sky, the pressure decreases. When applying a force F to the
hydraulic system as shown at right, which piston receives the largest force? 4. a. A b.? ?.cd. De,
the same 5. Which of the following ball is absolutely IMPOSSIBLE to float in the lake? a. Foam
ball b. Beach ball c. Hollow iron ball d. Solid steel ball 6. Heat is measuring transferred from one
object to another. mechanical energy b. thermal energy c.electric energy a. 7. If the temperature
of a body is that of its surroundings, it will lose heat to its surroundings spontaneously a. lower
than b. higher than c. equal to Two objects at different temperatures are placed in contact with
each other inside an insulator. Their final temperature would be 8. initial temperatures. a. b. c. d.
the same as greater than both smaller than both equal to the same value in-between The energy
conservation for an insulated (isolated) system, consisting of two parts with different initial
temperatures, means that 9. a. b. c. Both lose exactly the same amount of energy One loses
energy and the other gains exactly the same amount of energy One loses more energy than the
energy gained by the other 10. The sun warms the Earth through a. conduction b. convection
c.radiation 11. A negatively charged object is defined as a. b. c. having equal amount of positive
and negative charges having less negative charges than positive charges gaining extra electrons
Solution
1. (c) a chocolate bar
2 . (c) reduce pressure
3. (c) When falling from the sky, pressure decreases
4. (d) Pressure is same in each case but larger surface area should cause larger force
5. (d)
6. (b)
7. (b)

2. 8. (d)
9. (b)
10. (c)
11. (c)