#### T1 - Measurement Important Questions

7th Standard EM

Reg.No. :
•
•
•
•
•
•

Science

Time : 02:00:00 Hrs
Total Marks : 75
5 x 1 = 5
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. The SI unit of speed is __________

(a)

m/s2

(b)

m/s

(c)

km/h

(d)

m2/s

4. __________ is a derived quantity

(a)

length

(b)

mass

(c)

time

(d)

area

5. The largest distance between the earth and the sun is called as ___________ position.

(a)

normal

(b)

perihelion

(c)

aphelion

(d)

none of the above

6. 5 x 1 = 5
7. The materials with higher density are called __________

()

denser

8. The SI unit of volume is __________

()

cubic metre or m3

9. The CGS unit of density is ____________

()

g/cm3

10. The total number of seconds in one year = ___________

()

3.15 3 x 107 second

11. The corresponding units of fundamental quantities are called _________________

()

fundamental units

12. 3 x 1 = 3
13. Volume of liquids can be found using measuring containers

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

(a) True
(b) False
15. A substance which contains less number of molecules per unit volume is said to be denser.

(a) True
(b) False
16. 7 x 1 = 7
17. Area

18. (1)

amount of a substance

19. Volume

20. (2)

measuring jar

21. Length

22. (3)

rope

23. Volume

24. (4)

m2

25. Mass

26. (5)

Litre

27. Luminous intensity

28. (6)

m3

29. Milk

30. (7)

Candela

3 x 2 = 6
31. Assertion: Volume of a stone is found using a measuring cylinder.
Reason: Stone is an irregularly shaped object.
a. If both assertion and reason are true and reason is the correct explanation of assertion.
b. If both assertion and reason are true, but reason is not the correct explanation of assertion.
c. Assertion is true but reason is false.
d. Assertion is false but reason is true.

32. Assertion: Iron ball sinks in water.
Reason: water is denser than iron.
a. If both assertion and reason are true and reason is the correct explanation of assertion.
b. If both assertion and reason are true, but reason is not the correct explanation of assertion.
c. Assertion is true but reason is false.
d. Assertion is false but reason is true.

33. Assertion (A): It is easier to swim in sea water than in river water.
Reason (B): Density of sea water is more than that of river water
(a) Both A and R are true but R is not the correct reason.
(b) Both A and R are true and R is the correct reason.
(c) A is true but R is false.
(d) A is false but R is true

34. 2 x 2 = 4
35. Area: m2 :: Volume _______

36. Liquid: Litre :: Solid: ________

37. 5 x 2 = 10
38. One square metre is the area enclosed inside a square of side 2 metre.

39. Density is defined as the mass of the substance contained in unit volume

40. Neptune is 30 AU away from sun.

41. 1 Light year = 9.46 x 105 m.

42. One lightyear is defined as the distance travelled by light in vacuum during the period of one year.

43. 6 x 2 = 12
44. Name some of the derived quantities.

45. What is the density of gold?

46. Find the volume of (Take $\pi$ = 22/7)
i. a cube whose side is 3 cm.
ii. a cylinder whose radius is 3 m and height is 7 m.

47. Write the SI unit of speed

48. Mention the formula to calculate area of a circle?

49. How many fundamental quantities are there is SI units?

50. 6 x 3 = 18
51. What are derived quantities?

52. What is one light year?

53. 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.

54. A box is made up of iron and it has a volume of 125 cm3. Find its mass. (Density of iron is 7.8 g / cm3).

55. Define mass Mention its unit.

56. What is measurement?

57. 1 x 5 = 5
58. Describe the graphical method to find the area of an irregularly shaped plane figure.