2022-04-05 15:15:58
*Physics trial question prepared by Aquatic Man*
1. (a) What is an intrinsic semiconductor?
(b) Distinguish between the p-type and n-type semi-conductors.
2. (a) State two factors on which surface tension depends.
(b) How can mosquito larvae be made to sink in stagnant water?
3. (a) Write the de Broglie equation.
(b) Explain the significance of the equation.
4. a) Define heat capacity and state its unit.
(b) List two effects of heat on a substance.
(c) Explain how a tightly fitted glass stopper could be removed from a reagent bottle.
(d) A quantity of pepper soup of mass 800 g poured into a plastic container with a tight-fitting lid has a temperature of 30°C. The container is then placed in a microwave oven, rated 1200 W and operated for 3 minutes.
(i) Calculate the final temperature attained by the soup. (Assuming no heat losses).
(ii) Explain why containers with tight-fitting lids are not suitable for use in microwave cooking.
(iii) When the soup is brought out and allowed to cool, a dent is observed on the container. Explain. [Take specific heat capacity of the soup = 4000 Jkg−1−1 K−1−1]
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