What are the advantages and disadvantages of using a solar cooker ? Are there places where solar cookers would have limited utility?

What are the disadvantages of solar cells.

Study the structure and working of a solar cooker and / or a solar water- heater, particularly with regard to how it is insulated and maximum heat absorption is ensured.

State whether the following statements are true or false A solar cooker produces smoke due to which air pollution is caused.

What kind of mirror - concave , convex or plain - would be best suited for use in a solar cooker? Why?

An ant is moving around a few food pieces of different shapes scattered on the floor. For which food-piece would the ant have to take a longer round? Remember circumference of a circle can be obtained by using the expression c = 2pir , where r is the radius of the circle.

An ant is moving around a few food pieces of different shapes scattered on the floor. For which food-piece would the ant have to take a longer round? Remember circumference of a circle can be obtained by using the expression c = 2pir , where r is the radius of the circle.

An ant is moving around a few food pieces of different shapes scattered on the floor. For which food-piece would the ant have to take a longer round? Remember circumference of a circle can be obtained by using the expression c = 2pir , where r is the radius of the circle.

Samples of four metals A,B,C and D were taken and added to the following solutions one by one.The results obtained have been tabulated as follows. Use the table above to answer the following questions about metals A,B,C and D. (i)Which is the most reactive metal? (ii)What would you observe if B is added to a solution of copper (II) sulpahate? (iii)Arrange the metals A,B,C and D in the order of decreasing reactivity.