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:
- Moving air is called ______.
- The centre of the cyclone is the calm area which is called the__ of the storm.
- Is a dark funnel shaped cloud that reaches the ground from the
- The instrument that measures the wind speed is called ____.
- _________________blow at a speed of 89-102 km/hour.
- ________is the device which shows the direction of wind.
- Hotter air is __________ than cold air.
- 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.
- Warm air is ________ than the cold
- The pressure of the air decreases if the speed of the wind is __________.
- Cyclones are __________ because they can damage houses, telephones and other communication systems, agriculture, trees etc.
Q 8 – Give reason to support your answer:
- Tube of bicycle gets inflated when air is filled in it.
- It is difficult to move the bicycle against the direction of wind
- Sailor feels it difficult to sail his boat against the direction.
- People standing near a fast moving train, get pulled towards the train.
- Thatched roof is blown off because of high speed wind.
- 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.