B: 220 C
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An alternating voltage of frequency 0.5 Hz is applied to the Y-plates of a cathode-ray oscilloscope (c.r.o.). The dia…
A transformer connected to a 240V mains supply is used to light a 24 W lamp. The input current to the transformer is …
A polythene rod is rubbed with a duster. The duster then attracts small pieces of paper. Are the rod and the duster c…
The liquid in a puddle evaporates and this causes its temperature to change. How does the temperature of the liquid c…
When a refrigerator is switched on for the first time, the air surrounding the ice-box is cooled. What happens to the…
An ice-cube has a mass of 7.50 g. The ice-cube is at 0°C. Heat from the surroundings reaches the ice-cube at an avera…