Q1) Fill in the blanks in the following:
(a) The process of changing water into its vapor state is called ________.
(b) The process of changing water vapor into water is called ________.
(c) No rainfall for a year or more may lead to ________ in the region.
(d) Excessive rains may cause ________.
Q2) 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.
Q3) It was observed that a pencil sharpener gets attracted by both the poles of a magnet, although its body is made of plastic. Name a material that might have been used to make some part of it.
Q3) Which of the following statements are “true”?
(a) Water vapour is present in air only during the monsoon. ( )
(b) Water evaporates into air from the oceans, rivers, and lakes, but not from 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 layer of air, where it is cooler. ( )
Q4) Suppose you want to dry your school uniform quickly. Would spread it near an anghitior heater help? If yes, how?
Q5) Take out a cold bottle of water from the refrigerator and keep it on the table. After some time, you will notice a puddle of water around it. Why?
Q6) To clean their spectacles, people often breathe out on glasses to make them wet. Explain why the glasses become wet.
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