Area and its Measurement Class-7th Goyal Brothers Physics Solutions
Area and its Measurement Class-7th Goyal Brothers Physics Solutions Chapter-1. We Provide Step by Step Answers of Objective, True False , Fill in the blanks, Match the following , Short/Long Answer Type of Chapter-1,Physical Quantities and Measurement unit -1(Area and its Measurement) Visit official Website CISCE for detail information about ICSE Board Class-7.
Area and its Measurement Class-7th Goyal Brothers
Physics Solutions Ch-1 (unit-1)
Board | ICSE |
Class | 7th |
Subject | Physics |
Book Name | Goyal Brothers |
Theme-1 | Physical Quantities and Measurement |
Unit-1 | Area and its Measurement |
Topic | Solution of exercise questions |
Session | 2023-24 |
OBJECTIVE TYPE QUESTIONS
A. Fill in the blanks :
- Amount of surface occupied by an object or a place is called _area_.
- The SI unit of area if _m^{2}_.
- The appropriate unit to express the area of a two rupees coin is _mm^{2}_.
- The area of banyan leaf can be found by using _centimetre_ graph paper.
- The area of a state is best expressed in _km^{2}_.
B. Write ‘True’ or ‘False’ for the following statements :
- The area of a flat triangular cardboard is given by the formula ‘base*height’. [T]
- The area of a state is best expressed in hectares.[F]
- 10000 cm^{2} is equal to one m^{2}.[T]
- 1000 m^{2} is equal to one hectare.[T]
- The area of a rose leaf can be found by using millimeter graph paper.[T]
C. Statement given below are incorrect. write the correct correct statement:
1. The amount of space occupied by an object is called its area.
Correct Statement: The amount of space occupied by an object is called its volume.
2. SI unit of area is cm^{2} .
Correct Statement: SI unit of area is m^{2}
3. The area of a 5 rupees coin is best expressed in m^{2}
Correct Statement: The area of a 5 rupees coin is best expressed in mm^{2}
4. One hectare is equal to the size of a square having side 10 m.
Correct Statement: One hectare is equal to the size of a square having side 100 m.
5. 1 km^{2} is equal to 1000 hectare.
Correct Statement: 1 km^{2} is equal to 10000 hectare.
D. Tick (√) the most appropriate answer.
1. A square board of side 5 cm has an area of :
(a) 10 cm^{2}
(b) 55 cm^{2}
(c) 25 cm^{2}
(d) 25 m^{2}
Ans: (c) 25 cm^{2}
2. The area of circle is given by πr^{2} ,when π stands for :
(a) 22/7
(b) 27/2
(c) 7/22
(d) 2/27
Ans: (a) 22/7
3. A plot measuring 2 km in length and 1/2 km in breadth has area of :
(a) 100 Hectares
(b) 200 Hectares
(c) 1000 Hectares
(d) 500 Hectares
Ans: (a) 100 Hectares
4. The area of an irregular piece of card about 25 cm^{2 }is best found by using :
(a) mm graph paper
(b) cm graph paper
(c) Using mathematical formula
(d) none of these
Ans: (b) cm graph paper
5. The accurate measurement of area is required in the job of a :
(a) mason
(b) goldsmith
(c) blacksmith
(d) none of these
Ans: (b) goldsmith
E. Match the statement in Column A with those in Column B:
Column A |
Column B |
1. The amount of surface occupied by an object or place. |
1. m^{2} |
2. SI unit of area. |
2. area |
3. A multiple of SI unit of area used for measuring the area of a state. |
3. centimetre |
4. A sub-multiple unit of area used for measuring the area of a postal stamp. |
4. km^{2} |
5. A graph paper used for measuring the area of banyan leaf. |
5. mm^{2} |
Answer:
Column A |
Column B |
1. The amount of surface occupied by an object or place. |
2. area |
2. SI unit of area. |
1. m^{2} |
3. A multiple of SI unit of area used for measuring the area of a state. |
4. km^{2} |
4. A sub-multiple unit of area used for measuring the area of a postal stamp. |
5. mm^{2} |
5. A graph paper used for measuring the area of banyan leaf. |
3. centimetre |
STUDY QUESTIONS
Question 1.
(a) State what do you understand by the area of an object.
Answer: Area is defined as the total space taken up by a flat (2-D) surface or shape of an object. The space enclosed by the boundary of a plane figure is called its area.
(b) State the standard international unit of area.
Answer: The SI unit of area is the square meter (m^{2}), which is a derived unit.
(c) State two multiples and two sub-multiples f SI unit of area and express their numerical values in SI units.
Answer: Two multiples of of SI unit of area are, km² (square kilometres) , and Mm² (square megametres). To properly understand this answer, we have to know more about SI units and their multiples
Question 2. 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 ÷ breadth. ℓ = A ÷ b. Similarly, when we need to find breadth of a rectangle we need to divide area by length. Breadth of a rectangle = Area ÷ length.
Question 3. Without using a measuring scale, how can you find the area of the following correctly?
(a) 5 rupees coin: 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
(b) A playing card: by graph paper
(c) A banyan leaf: The area of a leaf is obtained by using a graph paper. A graph paper has small squares of area 1 mm 2 each. The area of the leaf will be equal to the number of squares it covers on the graph paper
Question 4. Using an appropriate measuring instrument (name the instrument) how can you find the area of a :
(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
Question 5. 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=π ×r2A=π ×r2 we can find area of circular field
— : end of Area and its Measurement Class-7th Goyal Brothers :–-
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