Available Answers

1. 1.

   Write T for True and F for False.

   1. A complex machine is made up of only one simple machine.
   2. A pair of scissors is a cross-one lever.
   3. A fixed pulley makes work easier by changing the direction of the effort.
   4. The steering wheel is an example of wheel and axle.
   5. A screw is a modified inclined plane.
   6. The sharp end of the wedge is used to cut or slice an object.
2. 2.

   Choose the correct option.

   1. A machine is a tool which
      1. saves our time
      2. makes work easier
      3. meed less effort.
      4. All of the these
   2. Example/s of simple machine
      1. pulley
      2. wedge
      3. lever
      4. All of these
   3. Example of class one lever is
      1. wheelbarrow
      2. nutcracker
      3. seesaw
      4. tweezers
   4. Which of the following is an example of a wedge?
      1. Stapler
      2. Screw
      3. Knife
      4. Nutcracker
   5. A pulley consist of
      1. a wheel
      2. a modified inclined plane
      3. a lever
      4. an inclined plane
3. 3.

   Choose the correct option to fill in the blank.

   1. A simple machine has ___________ (many/few) parts.
   2. The fixed point around which the rod moves is called the ___________ (effort/fulcrum).
   3. A pair of scissors is an example of class ___________ (one/two) lever.
   4. In a pulley the wheel rotates around the ___________ (axle/fulcrum).
   5. The movable pulley has __________ (fixed/movable) axle.
4. 4.

   Give two examples of the following.

   1. Simple machines
   2. Class-one lever
   3. Class-two lever
   4. Class-three lever
   5. Wheel and axle
   6. Inclined plane
   7. Wedge
5. 5.

   Name the following.

   1. Two types of machine.
   2. Three kinds of levers.
   3. The external force that has to be applied on a lever at a particular place.
   4. A lever in which the load is situated between the fulcrum and effort.
6. 6.

   Name the type of simple machine used for doing the following activities. One has been done for you.

   1. To carry load        Lever.
   2. To open a bottle ____________________.
   3. To break the outer covering of walnut _________________.
   4. Lifting a heavy load using a crane ________________.
   5. A rod for catching fish ______________________.
   6. A slope to move a heavy load ___________________.