Chhattisgarh State Board Class 7 History Chapter 5 Measurement Exercise Choose the correct answer, Fill in the blanks, Find the true and the false statements, Answer the following question here.
(1) Choose the correct answer:-
(1) The length & breath of a room are respectively 6m & 5m the area of its floor would be –
(a) 30 square centimeter
(b) 30 square meter
(c) 15 square meter
(d) 22 square meter
Answer:- (b) 30 square meter.
(2) Average of tenths 5m, 5.2m, 5.4m, 5.6m & 5.8m would be –
(a) 5.2 meter
(b) 5.0 meter
(c) 5.4 meter
(d) 5.5 meter
Answer:- (c) 5.4 meter.
(3) Area of a card having an irregular shape is measured –
(a) By an inch tape
(b) By a meter scale
(c) By a graph paper
(d) By a measuring cylinder
Answer:- (c) By a graph paper.
(4) Hectare is the unit of –
(a) Area
(b) Length
(c) Density
(d) Perimeter
Answer:- (a) Area.
(5) Formula for the density of a materials is –
(a) Mass x velocity
(b) Mass/volume
(c) Volume/mass
(d) Mass + volume
Answer:- (b) Mass/volume.
(2) Fill in the blanks –
(1) SI unit of density is ———– (kg/m3)
Answer:- Kg per cubic meter.
(2) Space occupied by the surface of an object is called its ——-.
Answer:- Area.
(3) The ——– of a unit —— of any material is called it density.
Answer:- Mass, Volume.
(4) The SI unit of area is ——-.
Answer:- Square meter.
(3) Find the true & the false statements correct the false statements.
(1) The total distance in going around any shape is called its area –
Answer:- False – Surface center by any object it called it area.
(2) Density of IRON is greater than that of water –
Answer:- True.
(3) The area of an irregular shape is found by using a graph paper –
Answer:- True.
(4) The area of a field is measured in square centimeter –
Answer:- False – Area of a field is measured in acres or hectares.
(4) Answer the following questions:-
(3) One side of a square object is 4.3cm. Find its area.
Answer:- Area of a square = (side)2
= (4.3)2 (side=4.3 given)
= 4.3×4.3
= 18.49 cm2
Therefore, Area of a square object is 18.49 cm2
(4) Arrange capper, Aluminium, wood & iron in order of increasing density.
Answer:- in increasing density à Copper (19300), Iron (7600), Aluminium (2740), wood (all in kg/m3)
(5) Write water, kerosene oil & glycerin in decreasing order of density
Answer:- In decreasing order à Glycerin(1300), water(1000), kerosene oil (800) (in kg/m3)
Please all answers write.
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