Question

You go to the nearest fruit shop to get 1kg of apple. The shop keeper measures 1kg in
front of you. You get the apple and come home. Your mother checks with the electronic
balance available at home. It is only 800g. [Note: the shopkeeper used a beam
balance for weighing the apple]
(i) Why is there a difference in quantity? Give reason for your answer. [2]
(ii) How many grams have you got less? [1]
(iii) Explain the working of beam balance.

Answer 1

Answer:

1) Difference in quantity is because the shopkeeper had cheated. There are various techniques used to cheat customers on basis of quantity. Sometimes Magnet is stuck down of the beam balance which creates unusual balance between two quantities and we get difference in quantity.

2) We got 200 grams less.

3)A beam balance is the simplest instrument to measure mass (weight). In a beam balance, the mass of an object is measured by comparing it with standard masses called standard weights. A simple beam balance consists of a straight beam of metal (generally iron), supported at its centre with the help of an iron loop. A pointer is fixed at the centre of the iron loop. Two identical pans are are suspended at equal distances from the centre, at the two ends of the beam.

Working: The object whose mass has to be measured is placed on one of the pans (generally the right pan). Standard weights are placed on the other pan until the metallic beam becomes horizontal and the pointer becomes vertical. The sum total of all weights used gives the mass of the object.

Explanation:

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