Winds, Storms and Cyclones For Class 7 Important Questions

Q 1 – In which year was Orissa hit by a cyclone?
(a) 1999

(b) 2000

(c) 2001

(d) 2004

Q 2 – Who among the following was the first to observe that whenever air moves its pressure drop? 

(a) Galileo

(b) Bernoulli

(c) Newton 

(d) Guericpe

Q 3 – A fire alarm usually detects smoke in case of fire. Where such an alarm should be placed in a room? 

(a) Near the door                                               

(b) On the floor

(c) On any wall                                                    

(d) On the ceiling

Q 4 – An intense whirl in the atmosphere with very strong winds in known as: 

(a) natural calamity

(b) storm

(c) cyclone

(d) tornado

Q 5 – The calm centre of cyclone is:

(a) Eye

(b) Nose

(c) Skin

(d) None of these

Q 6 – Fill in the blanks:

  1. Moving air is called ______.
  2. The centre of the cyclone is the calm area which is called the__ of the storm.
  3. Is a dark funnel shaped cloud that reaches the ground from the
  4. The instrument that measures the wind speed is called ____.
  5. _________________blow at a speed of 89-102 km/hour.
  6. ________is the device which shows the direction of wind.
  7. Hotter air is __________ than cold air.
  8. A violent tornado can travel at speeds of about __________________km/hr.

The main cause of wind movement is uneven ___________ on the earth.

Q 7 – Correct the following statements by replacing the highlighted word.  

  1. Warm air is ________ than the cold
  2. The pressure of the air decreases if the speed of the wind is __________.
  3. Cyclones are __________ because they can damage houses, telephones and other communication systems, agriculture, trees etc.

Q 8 – Give reason to support your answer: 

  1. Tube of bicycle gets inflated when air is filled in it.
  2. It is difficult to move the bicycle against the direction of wind
  3. Sailor feels it difficult to sail his boat against the direction.
  4. People standing near a fast moving train, get pulled towards the train.
  5. Thatched roof is blown off because of high speed wind.
  6. Smoke always rises up.

When strong/high speed wind blows, an umbrella held upright at times gets

Q 9 – How is air pressure affected with increase in wind speed?   

Q 10 – Is it difficult to ride a bicycle against the direction of the wind? Why?

Q 11 – What is tornado? What is speed of tornado?      

Q 12 – You want to buy a house. Would you like to buy a house having windows but no ventilators? Explain your answer.

Q 13 – Draw a well labelled diagram of land breeze and sea breeze.

Q 14 – A flag mounted on a flag post near the sea coast flutters in the direction of sea. At what time of the day does this happen — at mid-night or in the afternoon?

Q 15 – Give three precautions that should be taken to protect oneself from the  thunderstorm.