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#### Measurement Book Back Questions

8th Standard EM

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Science

Time : 00:45:00 Hrs
Total Marks : 30
3 x 1 = 3
1. SI unit of temperature is

(a)

celsius

(b)

fahrenheit

(c)

kelvin

(d)

ampere

2. SI unit stands for

(a)

International system of units

(b)

Integrated System of units

(c)

International symbol of units

(d)

Integrated symbol of units

3. Quantities other than base quantities are called as

(a)

supplementary quantities

(b)

derived quantities

(c)

professional quantities

(d)

energy quantities

4. 3 x 1 = 3
5. _______ of substance, contains 6.023 × 10+23 atoms or molecules.

()

Mole

6. The uncertainty in measurement is called as _______.

()

Errors

7. The intersection of two straight lines gives us_______.

()

Plane angle

8. 4 x 1 = 4
9. Intensity of light from a candle is approximately equal to one ‘candela’.

(a) True
(b) False
10. Angle formed at the top of a cone is an example of ‘Plane Angle’.

(a) True
(b) False
11. Quartz clocks are used in GPS Devices.

(a) True
(b) False
12. Candela is used to express electric fi eld intensity.

(a) True
(b) False
13. 3 x 2 = 6

15. Convert $\frac { \pi }{ 4 }$ into degree.

16. Round off the number 1.864 to two decimal places.

17. 3 x 3 = 9
18. Define - ampere.

19. What is electric current?

20. What is luminous Intensity?

21. 1 x 5 = 5
22. List out the base quantities with their units.