NCERT Class VII Science Solutions: Chapter 8-Winds, Storms and Cyclones Part 1

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MULTIPLE CHOICE QUESTIONS

Question 1:

A fire alarm usually detects smoke in case of fire. Where should such an alarm be placed in a room?

  1. Near the door

  2. On the floor

  3. On any wall

  4. On the ceiling

Answer: D

Question 2:

Four schematic diagrams are shown in Figure to depict the direction of sea breeze. Which of them gives the correct direction?

As showing in images is a Four schematic diagrams

Four Schematic Diagrams

As showing in images is a Four schematic diagrams

Answer: C

Question 3:

Figure shows a child blowing air with a straw near the opening of another straw which has its other end in a soft drink bottle. It was observed that the level of the soft drink in the straw rises up as soon as air is blown over its open end. Which one of the following best explains the reason for rise in level of the drink?

Figure shows a child blowing air with a straw

A Child Blowing Air with a Straw

Figure shows a child blowing air with a straw

  1. Blowing of air decreases pressure over the opening of the straw.

  2. The straw of the soft drink bottle collapses when air is blown over its open end.

  3. Blowing of air warms up the air inside the straw.

  4. Blowing of air increases the pressure on the surface of soft drink in the bottle.

Answer: A

Question 4:

Following are precautions one must take in case a storm is accompanied by lightning.

  1. Do not take shelter under a tree.

  2. Do not take shelter under an umbrella with a metallic end.

  3. Do not take shelter in open garages, storage sheds, etc.

  4. Do not take shelter in a bus in the open.

Which one of these is not correct?

  1. (i)

  2. (ii)

  3. (iii)

  4. (iv)

Answer: D