Q1. Fill the missing word in the blank spaces in the following statements:

(a) Wind is ____________ air.

Answer: moving

(b) Winds are generated due to _________ heating on the earth.

Answer: uneven

(c) Near the earth’s surface ________ air rises up whereas ________ air comes down.

Answer: warm, cooler

(d) Air moves from a region of _________ pressure to a region of ________ pressure.

Answer: high, low

Q2. Suggest two methods to find out wind direction at a given place.

Answer: Two methods to find out wind direction at a given place:

(i) The direction of the wind can be identified through an instrument called wind vane.

(ii) By seeing the direction of free released dry leaf or piece of paper.  The direction in which the leaf or paper goes, that is the direction of the wind.                                                                                                

Q3. State two experiences that made you think that air exerts pressure (other than those given in the test).

Answer: The two experiences that made us think that air exerts pressure are:

(i) When we overfill air in the balloon, the balloon bursts due to excessive air pressure.

(ii) The pressure of wind causes curtain, doors, clothes etc. to move with the direction of the wind.

Q4. You want to buy a house. Would you like to buy a house having windows but no ventilators? Explain your answer.

Answer: No, I will not buy a house having a window but not ventilators because warm air goes out through the ventilators. As warm air is lighter than cold air, hence it rises up and goes out through ventilators and fresh air comes through the window. If there are no ventilators then warm air will not pass out and our house will remain warm.

Q5. Explain why holes are made in hanging banners and hoardings.

Answer: Holes are made in hanging banners and hoardings to pass air through it.

When the wind is blowing fast, the hanging banners and hoardings may flutter or even get torn due to the air pressure. Hence, holes help banner or hoarding to withstand in that air pressure and remain intact. 

Q6. How will you help your neighbours in case cyclone approaches your village/town?

Answer: We can help our neighbours in case of a cyclone with the following measures:

(i) Shift them to a safer place.

(ii) Shift their animals, household materials and other important things to a safe place.

(iii) Calling to government agencies and emergency agencies such as medical department, fire brigades, police, rescue teams etc.

(iv) Cyclone shelter must be constructed in the cyclone-prone area. Proper arrangements should be made for quick evacuation of people.

Q7. What planning is required in advance to deal with the situation created by a cyclone?

Answer: There are some planning required in advance to deal with the situation created by a cyclone:

 (i) Cyclone shelter must be constructed in the cyclone-prone area. Proper arrangements should be made for quick evacuation of people.

(ii) Remove any loose roofing items, dead trees and branches which can cause accidents during a cyclone storm.

(iii) Listen to TV and radio weather bulletins regularly and do not ignore them.

(iv) Keep phone numbers of hospitals, a government agency such as police and fire brigades.

(v) Keep dry food items, safe drinking water, torches and emergency first aid box with important medicine.

(vi) Do not venture into the sea once a warning has been issued. Stay indoors as much as possible.

(vii) As soon as a warning is broadcasted, secure our house or move to a safer place.

(viii) Do not drive on roads which are underwater. The floods might have damaged the road because cyclones can cause floods due to heavy raining.

Q8. Which one of the following place is unlikely to be affected by a cyclone.

 (i) Chennai                        (ii) Mangaluru (Mangalore)

(iii) Amritsar                     (iv) Puri

Answer: (iii) Amritsar

Q9. Which of the statement given below is correct?

(i) In Winter the winds flow from the land to the ocean.

(ii) In summer the winds flow from the and towards the ocean.

(iii) A cyclone is formed by a very high-pressure system with very high-speed winds revolving around it.

(iv) The coastline of the India is not vulnerable to cyclones.

Answer: (i) In Winter the winds flow from the land to the ocean.