Units and Dimensions Quiz | Units and Dimensions Question and Answer for Practice

31. The SI unit of luminous intensity is

1. watt
2. lux
3. lumen
4. candela

32. The value of the magnitude rounded off to the nearest integral power of 10 is called

1. significant figure
2. uncertain number
3. significant number
4. order of magnitude

33. To measure the distance of a planet from the earth ..............method is used.

1. echo
2. direct
3. parallax
4. paradox

34. Units are classified into ..............groups.

1. 2
2. 4
3. 5
4. 6

35. Universal time is based on

1. rotation of the earth on its axis.
2. Earths orbital motion around the Sun.
3. vibrations of cesium atom.
4. oscillations of quartz crystal.

36. Which of the following is a supplementary unit?

1. steradian
2. candela
3. kelvin
4. pascal

37. Which of the following is NOT a characteristic of a good unit?

1. It is invariable.
2. It is reproducible.
3. It is perishable.
4. It is easily available

38. Which of the following is NOT a derived unit?

1. joule
2. erg
3. dyne
4. mole

39. Which of the following is NOT a dimensionless quantity?

1. angle
2. strain
3. specific gravity
4. density

40. Which of the following is the CORRECT way of writing units?

1. 25 ms length
2. 30 Kg
3. 5 Newton
4. 10 N

41. Which of the following quantity is expressedas force per unit area?

1. work
2. pressure
3. volume
4. density

42. Zero error of an instrument introduces

1. systematic error
2. random error
3. instrumental error
4. none of these