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Measurement Important Questions

8th Standard EM

Reg.No. :
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Science

Time : 01:00:00 Hrs
Total Marks : 50
5 x 1 = 5
1. Electric current belongs to ______quantities

(a)

base

(b)

supplementary

(c)

derived

(d)

professional

2. SI unit of temperature is

(a)

celsius

(b)

fahrenheit

(c)

kelvin

(d)

ampere

3. _______ can be used as memory or storage element in the computers.

(a)

Condutors

(b)

Insulators

(c)

Supercondutors

(d)

Semiconductors

4. __________ is the measure of the perceived power of light.

(a)

Luminous flux

(b)

Luminous power

(c)

Luminous Intensity

(d)

Both a and b

5. The unit of charge is ______

(a)

Coulomb

(b)

Ampere

(c)

(d)

6. 5 x 1 = 5
7. The uncertainty in measurement is called as _______.

()

Errors

8. _______ is the closeness of the measured value to the original value.

()

Accuracy

9. The intersection of two straight lines gives us_______.

()

Plane angle

10. ___________ is used to measure each base quantities

()

Standard unit

11. The melting point of pure ice is ______

()

OOC

12. 5 x 1 = 5
13. Accuracy

14. (1)

15. Precision

16. (2)

17. Luminous intensity

18. (3)

candela

19. Solid angle

20. (4)

Closeness to the Actual Value

21. plane angle

22. (5)

Closeness to two or more measurements

5 x 2 = 10
23. Mention the types of clocks based on their display.

24. How many times will the ‘minute hand’ rotate in one hour?

25. Name the metric systems of units.

26. What is the upper fixed point of the kelvin scale?

27. Which thermometer measures the temperature of an object without any physical contact?

28. 5 x 3 = 15
29. What is measurement?

30. Name some common systems of measurement.

31. Define- Temperature.

32. Name the three things needed for a perfect measurement?

33. Define the magnitude of an electric current.

34. 2 x 5 = 10
35. List out the base quantities with their units.

36. Write a note on Greenwich Mean time (GMT) and Indian Standard Time (IST)