Chapter – 6 SOLIDS, LIQUIDS AND GASES
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Chapter – 6
SOLIDS,
LIQUIDS AND
GASES
HOMEWORKEXERCISES
A.Fill in the blanks:
1. The amount of __________ gas is maximum in the air.
HOMEWORKEXERCISES
A.Fill in the blanks:
1. The amount of nitrogen gas is maximum in the air.
HOMEWORKEXERCISES
A.Fill in the blanks:
2. The molecules in a __________ are tightly packed.
HOMEWORKEXERCISES
A.Fill in the blanks:
2. The molecules in a solid are tightly packed.
HOMEWORKEXERCISES
A.Fill in the blanks:
3. A liquid has definite __________ but not definite __________.
HOMEWORKEXERCISES
A.Fill in the blanks:
3. A liquid has definite volume but not definite shape.
HOMEWORKEXERCISES
A.Fill in the blanks:
4. Crystals have definite __________.
HOMEWORKEXERCISES
A.Fill in the blanks:
4. Crystals have definite shape.
HOMEWORKEXERCISES
A.Fill in the blanks:
5. Water level is always __________.
HOMEWORKEXERCISES
A.Fill in the blanks:
5. Water level is always horizontal.
HOMEWORKEXERCISES
B. Write True or False for the following statements.
1. A gas has definite volume but not definite shape. _____
HOMEWORKEXERCISES
B. Write True or False for the following statements.
1. A gas has definite volume but not definite shape. False
HOMEWORKEXERCISES
B. Write True or False for the following statements.
2. Molecules can be seen under an ordinary microscope. _____
HOMEWORKEXERCISES
B. Write True or False for the following statements.
2. Molecules can be seen under an ordinary microscope. False
HOMEWORKEXERCISES
B. Write True or False for the following statements.
3. Sand can be removed from water by filtration. _____
HOMEWORKEXERCISES
B. Write True or False for the following statements.
3. Sand can be removed from water by filtration. True
HOMEWORKEXERCISES
B. Write True or False for the following statements.
4. A gas takes the shape of the space in which it is present. _____
HOMEWORKEXERCISES
B. Write True or False for the following statements.
4. A gas takes the shape of the space in which it is present. True
HOMEWORKEXERCISES
B. Write True or False for the following statements.
5. Filtration is a process in which heavy particles settle at the bottom of water. _____
HOMEWORKEXERCISES
B. Write True or False for the following statements.
5. Filtration is a process in which heavy particles settle at the bottom of water. False
HOMEWORKEXERCISES
C. Answer the following questions briefly.
1. Why is a ventilator or an exhaust fan fixed at height?
Answer:
HOMEWORKEXERCISES
C. Answer the following questions briefly.
1. Why is a ventilator or an exhaust fan fixed at height?
Answer: A ventilator or an exhaust fan is fixed at a height to allow hot air to go out.
HOMEWORKEXERCISES
C. Answer the following questions briefly.
2. What is humidity?
Answer:
HOMEWORKEXERCISES
C. Answer the following questions briefly.
2. What is humidity?
Answer: The amount of water vapour in air is called humidity.
HOMEWORKEXERCISES
C. Answer the following questions briefly.
3. What is loo?
Answer:
HOMEWORKEXERCISES
C. Answer the following questions briefly.
3. What is loo?
Answer: Hot winds that blow during summer are called loo.
HOMEWORKEXERCISES
C. Answer the following questions briefly.
4. What is matter made of?
Answer:
HOMEWORKEXERCISES
C. Answer the following questions briefly.
4. What is matter made of?
Answer: Matter is made of very tiny invisible particles called molecules.
HOMEWORKEXERCISES
C. Answer the following questions briefly.
5. Why does a liquid maintain a horizontal level?
Answer:
HOMEWORKEXERCISES
C. Answer the following questions briefly.
5. Why does a liquid maintain a horizontal level?
Answer: Liquids maintain a horizontal level due to atmospheric pressure and gravity.
HOMEWORKEXERCISES
D. Answer the following questions in detail.
1. Explain land breeze and sea breeze. Draw diagrams also.
Answer: Sea breeze: In the day, the sea is cool and the land is warm. So the breeze blows from sea to land. This breezeis known as sea breeze.
Land breeze: At night the land is cool and the sea is warm. So the breeze blows from land to sea. This breeze is known as land breeze.
HOMEWORKEXERCISES
D. Answer the following questions in detail.
2. What is the composition of air?
Answer: Air is a mixture mostly of gases. Nitrogen gas is present in maximum amount making 78% of total air. Oxygen is next, forming 21% of air. Other gases, including carbon dioxide, make up 1% of air. Some of the other gases include argon, helium, neon and ozone. Air also contains water vapour.
HOMEWORKEXERCISES
D. Answer the following questions in detail.
3. What are monsoon winds? Why are they important?
Answer: The winds that blow from the Indian Ocean in Southern Asia carrying lot of moisture are called monsoon winds.
Monsoon winds cause rains for four to five months after summers. It helps in irrigation of fields and filling lakes, rivers and ponds.
HOMEWORKEXERCISES
D. Answer the following questions in detail.
4. What makes air polluted?
Answer: Air also contains minute particles like dust, smoke and pollen grains. Their quantity also varies from place to place. Polluted air has more of such particles.
HOMEWORKEXERCISES
E. Draw and label filtration.
Thank YouSTAY HOMESTAY SAFE
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