Question Paper
Class / Subject: Class 4 (CBSE) · Environmental Studies
Chapter: Chapter 7 — Chapter 7: How Things Work
Time Allowed: 32 minutes
Max Marks: 16
1. What is an example of a lever? [1]
(A) A seesaw
(B) A wheel
(C) A ramp
(D) A pulley rope
2. What does a lever help us do? [1]
(A) Lift heavy objects with less effort
(B) Make objects heavier
(C) Increase distance only
(D) Nothing
3. What is an example of a wheel and axle? [1]
(A) A bicycle
(B) A seesaw
(C) A ramp
(D) A rope
4. What does a pulley do? [1]
(A) Changes the direction of force to help lift
(B) Makes objects heavier
(C) Removes the need for force
(D) Nothing useful
5. Where is a pulley commonly used? [1]
(A) Wells and cranes
(B) Only bicycles
(C) Only seesaws
(D) Only ramps
6. What is an inclined plane? [1]
(A) A ramp
(B) A wheel
(C) A lever
(D) A pulley
7. What does an inclined plane help with? [1]
(A) Moving objects to a higher place more easily
(B) Making objects heavier
(C) Removing gravity
(D) Nothing
8. Why are simple machines useful? [1]
(A) They make daily work easier
(B) They make work harder
(C) They have no use
(D) Only for decoration
9. What powers an electric fan's motor? [1]
(A) Electricity
(B) Water
(C) Wind only
(D) Nothing
10. What does a fan's motor do? [1]
(A) Spins blades to move air
(B) Produces light
(C) Stores energy
(D) Nothing
11. What does a light bulb use to produce light? [1]
(A) Electricity
(B) Water
(C) Wind
(D) Nothing
12. How does a wind-up toy work? [1]
(A) It stores and slowly releases energy
(B) It uses electricity
(C) It uses water
(D) It doesn't work
13. What basic principles power everyday devices? [1]
(A) Electricity, motion or mechanics
(B) Only magic
(C) Only luck
(D) Nothing
14. Why understand how devices work? [1]
(A) It builds appreciation and curiosity about science
(B) No reason
(C) Only for tests
(D) It's not useful
15. What can understanding devices inspire? [1]
(A) Further learning and curiosity
(B) Nothing
(C) Confusion only
(D) Boredom
16. Do simple toys use mechanical principles? [1]
(A) Yes
(B) No
(C) Only electricity
(D) Only magic