Question 12 Marks
24 coins are placed one upon another and their total thickness is recorded by a half- metre scale. The thickness is found to be 4.8 cm . Find the thickness of each coin in millimetres.
Answer
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Question 22 Marks
Fig. 2.14 shows four identical wooden rods, placed side by side, such $t$ hat their total thickness is 5 cm . Find the thickness of a single rod, correct to two decimal places.
Answer
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Question 32 Marks
Fig 2.13 shows a pencil, whose length is measured by placing eye at $A, B$ and $C$. In which position of eye is the accurate measurement of length recorded? What is the magnitude of length recorded? What is the magnitude of accurate length? Write the magnitude of length, when the eye is placed in other positions?
Answer
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Question 42 Marks
Name two characteristics of a standard unit for a physical quantity.
Answer
View full question & answer→Two characteristics of a unit are:-
it should be of convenient size
It must be universally accepted i.e. its value must remain the same at all places and at all times..
it should be of convenient size
It must be universally accepted i.e. its value must remain the same at all places and at all times..
Question 52 Marks
Define the term metre. Name one multiple and two submultiples of metre.
Answer
View full question & answer→The meter is defined as the length of the path traveled by light in a vacuum in a second. It is a base unit to measure the distance between two points. One multiple of metere is Kilometre and sub-multiple of metre is centimetre.
Question 62 Marks
Why do we need standard units for measurement?
Answer
View full question & answer→There are mainly two important purposes of using standard units, they are: To measure the quantities accurately. To convey the measurements to other people so that they understand those measurements accurately and follow the same further.