Winds, Storms and Cyclones quiz

Wind blows from:

High-speed winds are accompanied by:

The calm centre of a cyclone is called the:

Wind speed is measured by an:

A cyclone is called a hurricane in:

A dark funnel-shaped cloud reaching from the sky to the ground is a:

When air is heated it:

During a thunderstorm, the safest place among these is:

The monsoon winds that bring rain to India blow from the:

Cyclones are called typhoons in the:

Why do we put holes in large banners and hoardings? (2 marks)

Why does a balloon expand when we blow air into it? (2 marks)

Why are cyclones more common in coastal areas? (2 marks)

What is the source of energy for a cyclone? (2 marks)

Why should we not take shelter under an isolated tree during lightning? (2 marks)

Why does warm air rise? (2 marks)

How do satellites and radars help in tracking cyclones? (2 marks)

What is a cyclone shelter? (2 marks)

Why do ships avoid sailing during cyclone warnings? (2 marks)

What is the difference between a thunderstorm and a cyclone? (2 marks)

A cyclone has winds of 180 km/h. Convert this into m/s. If its eye has a diameter of 30 km, what is its radius? (3 marks)

The diameter of the eye of a cyclone can range from 10 km to 30 km. Find the difference between the largest and smallest. If a cyclone's eye moves at 15 km/h, how long will a 30 km wide eye take to pass over a town? (3 marks)

A cyclone was 600 km from the coast at 6 am, moving at 25 km/h towards it. At what time will it reach the coast? (3 marks)

The air pressure at sea level is normally about 1013 units. In the eye of a strong cyclone it fell to 913 units. Find the drop. What percentage of the normal pressure is the drop (to one decimal place)? (3 marks)

An anemometer cup goes around a circle of circumference 0.5 m. If it makes 40 rotations in 4 seconds, find the wind speed in m/s. (3 marks)

Read the passage and answer the questions. In October 1999, a super cyclone hit Odisha with wind speeds of over 250 km/h. Thousands of people died, and houses and crops were destroyed. (i) What made the cyclone so destructive? (ii) What is a storm surge? (iii) Suggest two measures to reduce damage in future. (5 marks)

Read the passage and answer the questions. Boojho blew hard across the mouth of an empty bottle with a small paper ball placed at its mouth. The ball came out instead of going in. (i) Why did the ball come out? (ii) What does this show about moving air? (iii) Give one daily-life example of the same effect. (5 marks)

Read the passage and answer the questions. On a hot afternoon, dark clouds gathered, and there was lightning, thunder and heavy rain with strong winds. (i) Name this weather event. (ii) Why does it occur on hot, humid days? (iii) State two safety rules. (5 marks)

Read the passage and answer the questions. The India Meteorological Department issued a warning 48 hours before a cyclone hit Andhra Pradesh. Fishermen were told not to go to sea and people were moved to shelters. (i) Why are warnings issued so early? (ii) Why were fishermen told not to go to sea? (iii) What should people keep ready in an emergency kit? (5 marks)

Read the passage and answer the questions. Paheli placed a candle near the bottom of a box with two chimneys and lit an incense stick near the other chimney. The smoke moved into the box and out through the chimney above the candle. (i) Why did the smoke move? (ii) What does this show about hot air? (iii) How does this explain winds? (5 marks)

Explain how winds are produced by uneven heating of the Earth, with diagrams for land and sea breeze and for winds between the equator and poles. (6 marks)

Draw a labelled diagram of a cyclone and describe how it is formed. (6 marks)

Describe two activities to show that air exerts pressure and that high-speed winds reduce air pressure. Draw the set-ups. (6 marks)

Explain the destruction caused by cyclones and the safety measures to be taken before, during and after a cyclone. (6 marks)

Explain how thunderstorms form and describe the safety measures against lightning. Draw a labelled diagram of a lightning conductor on a building. (6 marks)