Page 124 - Viva ICSE Science 5 : E-book

EXERCISES

A. Fill in the blanks.

1. Machines are of two types—__________ and __________.

2. A machine acts by reducing the __________ needed to displace an object.
3. Lever is a rigid bar or rod that rests on a support called __________.

4. In class __________ levers, the fulcrum is in between the eff ort and the load.

5. Bottle openers and nut crackers are examples of class ___________ levers.

6. There are two main types of pulleys—____________ and ____________.

B. Write (T) for true and (F) for false statements.

1. The longer the rod or the lever, the harder it is to move the load.

2. In class one levers, the load is in between the eff ort and the fulcrum.

3. In class three levers, the eff ort is in between the fulcrum and the load.
4. A pulley connects a lower level to a higher level.

5. Using screws, two things can be interlocked.

C. Match the following.

Column A Column B
1. Class 1 lever (a) Knife

2. Class 2 lever (b) Nut cracker
3. Pulley (c) Ramp

4. Wedge (d) Scissors
5. Inclined plane (e) Crane

D. Tick () the correct answer.

1. Which of these simple machines helps to move heavier objects to a height?

(a) Lever (b) Inclined plane (c) Pulley

2. Tongs are an example of __________.

(a) class one lever

(b) class two lever
(c) class three lever

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