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PHYSICS [2 Mark Question Answer]

Unit - 1.1 Area And its Measurement · ICSE STD 7 (ICSE - English Medium). 6 questions.

Questions

[2 Mark Question Answer]

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6 questions · timed · auto-graded

Question 12 Marks
There is a circular field of area of approx. 500 m2. How can you find its area accurately by using a measuring tape?
Answer
By using measuring tape, measure the diameter of the circular field i.e. from one side of the circular field to the other side. Now divide the diameter by 2 which gives radius of circular field. Now using the formula $A=\pi \times r 2 A=\pi \times r2$ we can find area of circular field
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Question 22 Marks
Using an appropriate measuring instrument (name the instrument) how can you find the area of a :
Answer
(a) postal stamp– by study scale of geometry box
(b) greeting card – by big scale
(c) school hall – by meter tape
(d) football ground– by long meter rolled tape
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Question 32 Marks
How can you find the length of a rectangular body, if you know its area and breadth without using a measuring scale?
Answer
When we need to find length of a rectangle we need to divide area by breadth. Length of a rectangle $=$ Area $\div$ breadth. $\ell=A \div b$.. Similarly, when we need to find breadth of a rectangle we need to divide area by length. Breadth of a rectangle = Area ÷ length.
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Question 42 Marks
There is a circular field of area of approx. $500 m^2$. How can you find its area accurately by using a measuring tape?
Answer
By using measuring tape, measure the diameter of the circular field i.e. from one side of the circular field to the other side. Now divide the diameter by 2 which gives radius of circular field. Now using the formula $A=\pi \times r 2 A=\pi \times r 2$ we can find area of circular field
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Question 52 Marks
Without using a measuring scale, how can you find the area of the following correctly?
(a) 5 rupees coin:
Answer
We can find the area of 5 rs coin with help of centimeter graph paper. Place the coin one the centimeter graph paper and with help of sharp pencil mark the outline of the coin on the paper. Now count the number of complete squares enclosed in the outline of the coin
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Question 62 Marks
How can you find the length of a rectangular body, if you know its area and breadth without using a measuring scale?
Answer
When we need to find length of a rectangle we need to divide area by breadth. Length of a rectangle $=$ Area $\div$ breadth. $\ell= A \div b$. Similarly, when we need to find breadth of a rectangle we need to divide area by length. Breadth of a rectangle $=$ Area $\div$ length.
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[2 Mark Question Answer] - PHYSICS STD 7 Questions - Vidyadip