Moving Air

Q. Which of the following explains the energy conversion in a windmill?

1. Wind energy $\to$ Electrical energy
2. Electrical energy $\to$ Wind energy
3. Electrical energy $\to$ Heat energy
4. Electrical energy $\to$ Sound energy

Q.

Moving air is known as:

1. Dew
2. Snow
3. Thunder
4. Wind

Q.

Question 9.3

State whether the following statements are true or false. If false, correct them.

Air helps in the movements of sailing yachts and glider but plays no role in the flight of birds and aeroplanes.

Q.

Question 12.3

Make sentences using the given set of words.

Air, wind, motion, called

Q.

Statement I: Factories should have tall chimneys.

Statement II: Tall chimneys in factories help in releasing harmful smoke high in the atmosphere.

1. Statement I is true and statement II false.
2. Statement I is false and statement II true.
3. Statement I is true and statement II is true.
4. Statement I is false and statement II is false.

Q.

Quesion 2

Wind does not help in the movement of which of the following?

a) Firki

b) Weather cock

c) Ceiling fan

d) Sailing yacht

Q. Which source of energy is used in a windmill?

1. Water
2. Wind
3. Geothermal
4. Fire

Q.

The movement of air is caused due to_________ difference.

Q.

Question 11.1

In the boxes of Column I the letters of some words got jumbled. Arrange them in proper form in the boxes given in Column II.

Q.

In chulhas, gaps are left between the logs

1. to decrease the ignition temperature of the fuel

2. to allow the air to enter and facilitate fuel burning

3. to cut off the supply of air

4. all of these

Q.

Question 17.1

Explain the following observations very briefly

A firki does not rotate in a closed area.

Q.

Wind has energy associated with it.

1. True
2. False

Q.

Which of the following can be utilized to produce electricity?

1. Wood

2. Soil

3. Wind

4. Stone

Q. Look at the words in the bubbles.
Write what you do when are at a
(i) feast? _______
(ii) race? _____
(iii) cricket match? ______
(iv) cinema? _______
(v) fair? _____
(vi) party? _____

Q.

Question 17.2

Explain the following observations very briefly

The arrow of weather cock points towards a particular
direction at a particular moment.

Q. Select the incorrect statements about uses of wind.

1. It makes windmills rotate.
2. It helps in cooking.
3. It helps in paragliding.
4. It makes pinwheel spin.

Q. Define factors controlling movement of air?

Q. Windmills convert wind power to:

1. light energy
2. sound energy
3. electrical energy
4. heat energy

Q. Moving air is known as:

1. Dew
2. Snow
3. Thunder
4. Wind

Q. Moving air has energy associated with it.

1. True
2. False

Q.

energy conversion ofwind energy

Q.

Why is the freezer located on the top of the refrigerator?

Q. Natural shape of the wings of a bird help them floating in air.-clarify how

Q. The energy associated with air is because ___ .

1. of the motion of the gaseous particles
2. of the fact that air is a mixture of gases
3. of the density of air
4. air is transparent

Q. What is the shape that fish, birds, airplanes and ships have that reduces air/water resistance?

Q. Pick out the pairs of rhyming words from the poem.

Q. Did his plan work? How?

Q. What causes movement in air?

1. Difference in temperature
2. Difference in pressure
3. Difference in volume
4. Both A and B

Q. Moving air has energy associated with it.

1. True
2. False