Q. 6. Do you think it is better to use compost instead of chemical fertilisers? Why?
Q. 5. (c) Write a story on how packaging increases the amount of garbage
Q. 5. (b) Give an example in which packaging could have been reduced?
Q. 5. (a) Collect different kinds of packaging material. What was the purpose for which each one was used? Discuss in groups.
Q. 4. (b) With the help of a lens look at the pieces of paper you collected for the above question. Do you see any difference in the material of recycled paper and a new sheet of paper ?
Q. 2. Discuss :
(a) Is garbage disposal the responsibility only of the government?
Q. 1 (b) Have you seen any other organism besides redworms, in your pit? If yes, try to find out their names. Draw pictures of these.
Q. 1. (a) Which kind of garbage is not converted into compost by the redworms?
Q. 8. When does a drought occur ?
Q. 7. How are clouds formed?
Q. 6. To clean their spectacles, people often breathe out on glasses to make them wet. Explain why the glasses become wet.
Q. 5. Take out a cooled bottle of water from refrigerator and keep it on a table. After some time you notice a droplets of water around it. Why?
Q. 4. Suppose you want to dry your school uniform quickly. Would spreading it near an anghiti or heater help? If yes, how?
Q. 3. Which of the following statements are “true” ?
(a) Water vapour is present in air only during the monsoon. ( )
(b) Water evaporates into air from oceans, rivers and lakes but not from the soil.( )
(c) The process of water changing into its vapour, is called evaporation.( )
(d) The evaporation of water takes place only in sunlight.( )
(e) Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler.( )
Q. 2. State for each of the following whether it is due to evaporation or condensation:
(a) Water drops appear on the outer surface of a glass containing cold water.
(b) Steam rising from wet clothes while they are ironed.
(c) Fog appearing on a cold winter morning.
(d) Blackboard dries up after wiping it.
(e) Steam rising from a hot girdle when water is sprinkled on it.
Q. 1. Fill up the blanks in the following:
(a) The process of changing of water into its vapour is called _________________.
(b) The process of changing water vapour into water is called _________________.
(c) No rainfall for a year or more may lead to _________________ in that region.
(d) Excessive rains may cause _________________.
Q2. Mark 'True' or 'False' for following statements:
(a) Electric current can flow through metals.
(b) Instead of metal wires, a jute string can be used to make a circuit.
(c) Electric current can pass through a sheet of thermo Col.
Q10. The handles of the tools like screwdrivers and pliers used by electricians for repair work usually have plastic or rubber covers on them. Can you explain why?
Q9. Why should an electrician use rubber gloves while repairing an electric switch at your home? Explain.
Q8. Using the "conduction tester" on an object it was found that the bulb begins to glow. Is that object a conductor or an insulator? Explain.