Question 1Multiple choice · 1 markA* challenge
What is the lowest possible temperature?
- A −273 °C
- B 0 °C
- C −100 °C
- D 0 °F
Show answer
Answer: A
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Generate Paper 1 · Multiple Choice →What is the lowest possible temperature?
Answer: A
A fixed mass of gas in a sealed syringe is pushed in slowly so that its volume decreases. The temperature of the gas stays constant.
What happens to the average speed of the gas molecules and to the rate at which they hit the walls?
| average speed of molecules | rate of collisions with walls | |
|---|---|---|
| A | stays the same | increases |
| B | decreases | increases |
| C | stays the same | stays the same |
| D | increases | increases |
Answer: A
A fixed mass of gas at 88 kPa occupies 490 cm³. It is compressed at constant temperature to 245 cm³. What is the new pressure?
Answer: C
How can a magnet be demagnetised?
Answer: A
A radioactive sample has an activity of 3200 Bq. Its half-life is 5 days. What is the activity after 15 days?
Answer: B
A stone of mass 178 g is lowered into a measuring cylinder. The water level rises from 40 cm³ to 60 cm³. What is the density of the stone?
Answer: D
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