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Suppose you are given a long bar magnet and you are asked to break it into four small magnets. Draw diagrams showing the polarities of each broken part.
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A lever of length 100 cm has the effort of 15 kgf at a distance of 40 cm from the fulcrum at one end. What load can be applied at its other end?
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You are given an iron nail, a torch cell, and a long piece of insulated copper wire. With the help of a labelled neat diagram, describe in steps how you will make the nail, an electromagnet.
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In a lever, the fulcrum is at one end at a distance of 30 cm from the load and effort is at the other end at a distance of 90 cm from the load. Find :
(a) the length of load arm,
(b) the length of effort arm, and
(c) the mechanical advantage of the lever.
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Answer the following.
Name the simplest of all types of machines.
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Answer the following.
State the principle of levers.
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Answer the following.
What is a Class I lever?
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Tick the most appropriate answer.
Which of the following is a Class II lever?
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Tick the most appropriate answer.
A pair of scissors is an example of a/an
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Tick the most appropriate answer.
Which of the following methods is used to magnetize a magnetic without touching it by a magnet?
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Answer the following in a word or two or in a sentence.
Given an example of a Class I lever.
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Answer the following in a word or two or in a sentence.
Which type of machine is used to squeeze a lemon?
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Answer the following in a word or two or in a sentence.
Give one example of a machine used to multiply speed.
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Answer the following in short.
What is the basis of the classification of levers?
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Answer the following in short.
Using a suitable example, describe how a machine acts as a force multiplier.
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State if the following statement is true or false. Correct the statement if it is false.
A ruler with a damaged end can be used to measure a length accurately.
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Answer the following in short.
Name a few common appliances that use electromagnets.
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Write true or false.
Mass is the measure of quantity of matter.
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Fill in the blank:
The ............ of an object is measured with the help of a beam balance.
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Match the following column:
| Column A | Column B |
| (a) Length of a housing plot | (1) Clock |
| (b) Breadth of a book | (2) Beam balance |
| (c) Mass of an apple | (3) Thermometer |
| (d) Period of time for study | (4) Measuring tape |
| (e) Temperature of a body | (5) Graph paper |
| (f) Surface area of a leaf | (6) Metre ruler |
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