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A Journey Through States of Water — Hard

15 questions 18 min PYQ-grade reasoning

  1. Q1. Consider the following statements about a fair investigation of how exposed area affects evaporation: I. The amount of water in both containers must be the same. II. The two containers must be kept next to each other in the same surroundings. III. One container should be in sunlight and the other in shade. Which statements together make the test fair?

  2. Q2. Two identical bottle caps each have the same amount of water. Cap A is kept in sunlight and Cap B is kept in shade nearby. After some hours

  3. Q3. Aavi and Thirav see that puddles in the school playground gradually disappear by evening. According to the chapter, the disappearance is best explained as

  4. Q4. Assertion (A): Water droplets appear on the inner side of a steel plate used to cover a half-filled pot of boiling water. Reason (R): Water vapour in the air inside the pot meets the cold steel plate and condenses into liquid droplets.

  5. Q5. Consider the following statements about the three states of matter (not just water): I. Some other substances such as wax, oil and ghee also exhibit the three states. II. Smell of cooked food reaches us across rooms because gases spread through the air. III. Stones, wood and glass are common examples of liquids. Which statements are correct?

  6. Q6. Assertion (A): Coconut oil kept in a bottle often becomes solid during the winter season in north India. Reason (R): On cooling, a liquid can change into its solid state — this process is called freezing.

  7. Q7. Consider the following steps for a pot-in-pot cooler: I. Fill the gap between a larger and smaller earthen pot with sand and pour water on it. II. Cover the smaller pot with a lid or wet jute sack. III. Replace the earthen pots with stainless steel pots. Which steps follow the intended design?

  8. Q8. Place the following events in the correct order in the formation of rain: P. Water vapour rises and cools at higher altitudes. Q. Tiny water droplets form around dust particles, making clouds. R. Many droplets join to form bigger drops. S. Drops become heavy and fall as rain.

  9. Q9. Consider the following statements about the water cycle: I. Water from the oceans and Earth's surface evaporates into the atmosphere as vapour. II. Water vapour returns as rain, hail or snow. III. Water ultimately flows back to the oceans. Which statements together describe the water cycle correctly?

  10. Q10. In Activity 8.7, the same amount of water is kept in a bottle cap and in a plate placed next to each other. Which condition is changed in this investigation, and which is kept the same?

  11. Q11. In a modified Activity 8.4, the water level in the cold tumbler is marked with a permanent marker and the tumbler is kept for 30 minutes. After 30 minutes the marked level does NOT go down, but droplets are seen on the outer surface. Which conclusion is justified?

  12. Q12. The seat of a two-wheeler parked in the sun has become very hot. Which method best uses the cooling effect of evaporation to cool it?

  13. Q13. Assertion (A): When water is sprinkled on a hot dosa pan, it disappears almost at once. Reason (R): The hot pan rapidly converts the water into water vapour (steam), and most of the vapour goes into the air.

  14. Q14. In Activity 8.10 (cloud-in-a-bottle), comparing the two trials — without and with burnt newspaper — the main difference is

  15. Q15. Consider the following statements about ice and water: I. Ice retains its own shape but water takes the shape of the container. II. Water splashes and flows, but ice does not. III. Ice can change to water and water to ice, depending on heating or cooling. Which statements are correct?

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