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प्रश्न
Name the material commonly used for the manufacturing of solar cells.
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उत्तर
Silicon and Gallium. Solar cell produces d.c. current. State whether a solar cell produces a.c. or d.c. current.
संबंधित प्रश्न
Define 1 joule of work.
How much work is done by the gravitational force of earth acting on a satellite moving around it in a circular path? Give reason for your answer.
A max X goes to the top of a building by a vertical spiral staircase. Another man Y of the same mass goes to the top of the same building by a slanting ladder. Which of the two does more work against gravity and why?
A girl weighing 400 N climbs a vertical ladder. If the value of g be 10 m s−2, the work by her after climbing 2 m will be :
Name the physical quantity whose SI unit is Nm.
P, Q and R are three forces which act as shown in fig.
The point O lies in the same plane. Given, P = Q = R = 10N
(i) Which force has the least moment about O? Give a reason.
(ii)Which force has the greatest moment about O? Give a reason.
What is the ratio of SI units to CGS units of 'work'?
Name the type of energy possessed by a
(i) stretched catapult (ii) hot iron
(iii) wound up clock
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
An engine is pulling a train.
