Source instructions: For multiple-choice problems, circle the right answers. Some problems may have more than one right answer. For essay problems, give a brief explanation.
The Sun is the center of our solar system. It rises in the morning, and sets in the late afternoon. The Sun ……
Three chambers are connected with doors. The chambers have the same volume. The pressure at A is 2 atm, B is 5 atm and C is 5 atm. What will be the pressure in A, B and C if all the doors are opened?
Look at the following picture. Two frogs (A and B) are at the same distance from their mother that is making noise. The mother and frog A are in the air, while frog B is in the water. Which frog (A or B) will hear the noise first? Give your explanation.
Two materials have different refractive indices, $n_1$ and $n_2$, respectively. If they are illuminated from the left, the ray will be deflected in different ways as shown below. Please draw the ray path when the two materials are combined as follows: (a) separated slabs; (b) touching slabs.
A ball-shaped metal is connected to the ground using a conductive wire. If you bring a negatively charged rubber rod near the metal without touching it, the metal will: (a) have positive charge; (b) have negative charge; (c) remain neutral. Explain your answer.
Paul’s mass is equal to Tina’s. They open their parachutes at the same altitude (height). Tina’s parachute is twice larger than Paul’s. Who will reach the ground first? Explain your answer.
Changes in the forms of energy may take place in many situations. Complete the table below to explain the energy changes.
| Situation | Part | Form of energy | Gain (G) or loss (L) |
| --- | --- | --- | --- |
| A footballer kicking a static ball | footballer | Chemical | L |
| | ball | … | G |
| Frying an egg over a gas stove | egg | … | G |
| | gas | Chemical | … |
| Turning your television on | electric source | … | L |
| | room | Heat | … |
