Specific heat capacity and latent heat Quiz
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5 questions, one answer each
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1. How much energy is needed to raise the temperature of 0.50 kg of water by 30 K? (c = 4180 J kg⁻¹ K⁻¹)
- A. 6.3 × 10⁷ J
- B. 2.1 × 10³ J
- C. 6.3 × 10⁴ J
- D. 1.3 × 10⁵ J
2. How much energy is needed to boil away 0.20 kg of water at 100 °C? (L = 2.26 × 10⁶ J kg⁻¹)
- A. 4.5 × 10⁸ J
- B. 4.5 × 10⁵ J
- C. 1.1 × 10⁷ J
- D. 8.4 × 10⁴ J
3. What happens to the energy supplied to ice as it melts at 0 °C?
- A. It increases the potential energy of the molecules
- B. It increases the mean kinetic energy of the molecules
- C. It raises the temperature of the water
- D. It is converted into mass
4. In a potential divider, the NTC thermistor's temperature rises. What happens to the p.d. across the fixed resistor?
- A. It decreases
- B. It stays the same
- C. It falls to zero
- D. It increases
5. A 100 W heater melts 0.030 kg of ice in 100 s, with no other heat gains. What is L for ice?
- A. 3.3 × 10³ J kg⁻¹
- B. 3.3 × 10⁵ J kg⁻¹
- C. 3.0 × 10⁻⁴ J kg⁻¹
- D. 1.0 × 10⁴ J kg⁻¹