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#### Measurement Book Back Questions

7th Standard EM

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Science

Time : 00:45:00 Hrs
Total Marks : 30
3 x 1 = 3
1. Which of the following is a derived unit?

(a)

mass

(b)

time

(c)

area

(d)

length

2. Which of the following is correct?

(a)

1L = 1cc

(b)

1L = 10 cc

(c)

1L = 100 cc

(d)

1L = 1000 cc

3. SI unit of density is

(a)

kg/m2

(b)

kg/m3

(c)

kg/m

(d)

g/m3

4. 3 x 1 = 3
5. Volume of irregularly shaped objects are measured using the law of ________

()

Archimedes

6. One cubic metre is equal to ______ cubic centimetre.

()

10,00,000 or 106

7. Density of mercury is _______

()

13,600 kg/m3

8. 4 x 1 = 4
9. The region covered by the boundary of the plane figure is called its volume

(a) True
(b) False
10. Volume of liquids can be found using measuring containers

(a) True
(b) False
11. Water is denser than kerosene.

(a) True
(b) False
12. A ball of iron floats in mercury.

(a) True
(b) False
13. 3 x 2 = 6
14. Write down the formula used to find the volume of a cylinder.

15. Give the formula to find the density of objects.

16. Name the liquid in which an iron ball sinks.

17. 3 x 3 = 9
18. Distinguish between the volume of liquid and capacity of a container.

19. There are three spheres A, B, C as shown below:

Sphere A and B are made of the same material. Sphere C is made of a different material. Spheres A and C have equal radii. The radius of sphere B is half that of A. Density of A is double that of C. Now answer the following questions:
i. Find the ratio of masses of spheres A and B.
ii. Find the ratio of volumes of spheres A and B.
iii. Find the ratio of masses of spheres A and C.

20. A sphere is made from copper whose mass is 3000 kg. If the density of copper is 8900 kg/m3, find the volume of the sphere.

21. 1 x 5 = 5
22. Describe the graphical method to find the area of an irregularly shaped plane figure.