State whether the following statements are true or false. Correct the false statements.

(a) A girl riding a bicycle is getting zero work done.

(b) When the value of mechanical advantage is equal to one, it means that effort is equal to load.

(c) In class III lever, the fulcrum is between the load and the effort.

(d) In a fixed pulley, the pulley can move.

(e) Tyres of cars and buses are examples of wheel and axle.

Which of the following is not a simple machine?

1. Bicycle
2. Scissors
3. Doorknobs
4. Bottle openers

What type of simple machine is a bottle opener?

1. Wedge
2. Class I lever
3. Class II lever
4. Wheel and axle

Which of the following is not a feature of an inclined plane?

1. Length of inclined plane
2. Height of inclined plane
3. Threads
4. Slanting surface