Science worksheets for Class 7 — with answers

Answer the questions.

1. Where does digestion of food begin in humans?
2. Name the longest part of the alimentary canal.
3. Which animals chew the cud?
4. How does an amoeba take in food?
5. The process by which green plants make food is called ______.
6. Fungi that feed on dead matter are called ______.
7. Name the raw materials for photosynthesis.
8. Which gas is released during photosynthesis?
9. Tiny pores on leaves are called ______.
10. Where is most food absorbed in our body?

Answer the questions.

1. Name two poor conductors of heat (insulators).
2. A wind blowing from the sea to the land is called a ______.
3. Heat moves through liquids and gases by ______.
4. Why do we wear dark clothes in winter?
5. Why does a clinical thermometer have a kink?
6. Name the three ways heat travels.
7. The degree of hotness of a body is called its ______.
8. Heat moves through solids by ______.
9. Name two good conductors of heat.
10. How does heat from the Sun reach us?

Answer the questions.

1. Name an acid found in lemon.
2. Name an acid found in curd.
3. Turmeric turns ______ in a base.
4. Acids taste ______; bases taste ______.
5. What colour does red litmus turn in a base?
6. What colour does blue litmus turn in an acid?
7. The reaction of an acid with a base is called ______.
8. Solutions that are neither acidic nor basic are ______.
9. What is formed when an acid reacts with a base?
10. Name a natural indicator.

Answer the questions.

1. Is rusting of iron a physical or a chemical change?
2. Is burning of paper a physical or a chemical change?
3. What two things are needed for iron to rust?
4. Name one way to prevent rusting.
5. Is dissolving sugar in water a physical or a chemical change?
6. A change in which a new substance is formed is a ______ change.
7. Coating iron with zinc is called ______.
8. Is cooking food a physical or a chemical change?
9. Is melting of ice a physical or a chemical change?
10. Is tearing paper a physical or a chemical change?

Answer the questions.

1. Yeast respires anaerobically and produces ______.
2. The kidneys remove waste from blood as ______.
3. Breaking down food to release energy is called ______.
4. How many chambers does the human heart have?
5. Blood vessels that carry blood away from the heart are ______.
6. Respiration without oxygen is called ______ respiration.
7. Which tissue carries water in plants?
8. Which tissue carries food in plants?
9. Loss of water from leaves as vapour is called ______.
10. How do earthworms breathe?

Answer the questions.

1. A car covers 120 km in 2 hours. Find its speed.
2. The time taken by a pendulum for one oscillation is its ______.
3. Which instrument shows the speed of a vehicle?
4. A bus moves at 50 km/h. How long does it take to cover 200 km?
5. What is the SI unit of speed?
6. Which instrument shows the distance covered by a vehicle?
7. A cyclist covers 900 m in 3 minutes. Find the speed in m/min.
8. A train moves at 80 km/h for 3 hours. How far does it go?
9. Name two ways people measured time in the past.
10. 1 hour = ______ seconds

Answer the questions.

1. In a circuit, the bulb glows only when the switch is ______.
2. Name one use of an electromagnet.
3. The heating effect of current is used in ______.
4. Which effect of current makes an electric bell ring?
5. Which modern switch replaces the fuse?
6. A coil of wire that becomes a magnet when current flows is an ______.
7. The wire in a heater is made of ______.
8. A safety device that melts when too much current flows is a ______.
9. Draw (or name) the symbol of an electric cell.
10. Why is a CFL or LED better than an ordinary bulb?

Answer the questions.

1. The splitting of white light into colours is called ______.
2. Which mirror do dentists use?
3. Name a natural example of white light splitting into colours.
4. In a plane mirror, your right hand appears as the ______ hand.
5. Name the device that splits white light into seven colours.
6. White light is made of ______ colours.
7. Which lens is used as a magnifying glass?
8. The image in a plane mirror is ______ and the same size.
9. A lens that is thicker in the middle is a ______ lens.
10. A lens that is thinner in the middle is a ______ lens.