Which of the following units is the S.I. unit of heat capacity?
A. Jkg‾¹ B. Jkg‾¹K‾¹ C. JK‾¹ D. Jg‾¹K‾¹ Correct Answer: Option A A. Jkg‾¹Which of the following concepts is a method of heat transfer that does not require a material medium?
A. conduction B. radiation C. diffusion D. convection Correct Answer: Option B B. radiationIn an experiment in which a molten substance is allowed to cool, the cooling curve above was obtained. The temperature 60ºC is known as the?
A. vaporization point B. cooling temperature C. boiling point D. melting point Correct Answer: Option D D. melting pointA battery of emf 24V is connected to three resistors P, Q and R as illustrated in the diagram. Determine the voltage across the resistor Q.
A. 5v B. 10v C. 14v D. 24v Correct Answer: Option B Explanation E – V1 + V2 24V = 14V + VQP VQP = 4 + 14V VQP =10VA quantity of hot water at 100ºC is added to 400g of water at 10ºC until the temperature of the mixture is 60ºC. Calculate the mass of the hot water added. [Specific heat capacity of water =4200JKg-1 K-1]
A. 200g B. 320g C. 400g D. 500g Correct Answer: Option D D. 500g Explanation Heat lost by hot water = Heat gained by cold water M x 4200 x (100 – 60 = 0.4 x 4200 x (60 – 10) 4200m x 40 = 0.4 x 4200 x 50 40m = 0.4 x 50 m = 0.4×50/40 = 0.5kg =...Products
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