# Simple Machine Important questions | Grade VIII

## Important questions for Simple Machine for Grade VIII

1. Define simple machine .
2. What is meant by complex machine ? Give examples .
3. Write the advantages of a simple machine .
4. Write the types of simple machine .
5. State the principle of simple machine .
6. Define output work and input work .
7. What is meant by perfect or ideal machine ?
8. Define load , effort and fulcrum .
9. What is effort and load distance ?
10. Define Mechanical advantage . Write its formula .
11. Define velocity ratio .
12. Define efficiency.
13. M.A. of machine is 3 . What does it mean ?
14. V.R. of a machine is 5 . What does it mean ?
15. The efficiency of simple machine is 80% . What does it mean ?
16. Write the method to increase the efficiency of simple machine .
17. Define lever . Write its type .
18. Define first , second and third class lever with diagram . Give their example .
19. Write the advantages of first , second and third class lever .
20. Define pulley .
21. Write the types of pulley .
22. Define fixed , movable , mixed pulley with diagram .
23. What is inclined plane ? Give example and diagram .
24. Define wheel and axle with example and diagram .
25. Define screw with example and diagram .
26. What is wedge ? Give example and diagram .
27. Which simple machine is called a continuous lever ? Why ?
28. Scissors is called simple machine . Why ?