Units and Measurements Mock Test – Class 11 Physics

1. A gross error in measurement is most closely associated with

2. A compact memory line for common prefixes is , , and . The missing entry in is

3. A dimensionless quantity is one whose dimensional formula is

4. A distance record gives the radius of Earth as approximately . Its order of magnitude is best taken as

5. A formula defines resistance using potential difference and current . If has dimensions , the dimensional formula of is

6. A distant object is observed from two points separated by . If its parallax angle is , its distance is

7. A vernier callipers has a negative zero error of . Its zero correction is

8. A digital balance always reads even when nothing is placed on it. Later it gives for a small object. This situation mainly affects

9. A dimensionally valid equation may still be physically wrong because dimensional analysis

10. Strain is defined as . Its dimensional formula is

11. A measurement gives for a time interval whose accepted value is . The absolute size of the error is

12. A quantity is assumed to depend on force , area , and time as , where is dimensionless. If has the dimensions of power, the values of , , and are

13. In the parallax method for measuring a very large distance, the baseline is

14. A length is measured with two instruments: Instrument P has least count , and Instrument Q has least count . For the same careful procedure, Instrument Q is generally better because it

15. A length is . Its value in is

16. A measurement table is given below.

The row whose description needs repair is

17. A set of repeated readings has small scatter, but the instrument is known to have a calibration error. The most suitable conclusion is that the readings may be

18. A screw gauge reading is obtained by adding the main scale reading to

19. The relation is dimensionally consistent with energy because

20. A cylinder has diameter and length . Its volume is calculated from . The maximum percentage error in is closest to

21. A balance reads even when its pan is empty. This error is mainly

22. A measurement record for combined lengths is shown below.

The case whose reported uncertainty needs repair is

23. A graph is plotted with on the vertical axis and on the horizontal axis, where is time period and is acceleration. The dimension of the slope is

24. A set of five readings for a time interval is , , , , and . The mean value is

25. A length is reported as . The two zeros at the end are significant because

26. A density is . Its value in is

27. A stopwatch starts from instead of . It shows at the end of a race. The corrected time interval is

28. Speed is treated as a derived quantity because it is obtained from

29. A scale list is arranged from smaller to larger length as

30. The record is rewritten using negative powers as

31. A floor area is reported as . This record shows that

32. A graph has velocity on the vertical axis and time on the horizontal axis. The dimension of the slope is

33. If random error is reduced by taking many readings, the final result should still include

34. Accuracy in measurement refers to

35. The observed reading of a vernier callipers is . If the zero error is , the corrected reading is

36. The International System of Units is commonly abbreviated as

37. A micrometer screw advances by for one full turn. If the thimble is turned through divisions out of divisions, the screw advances by

38. A volume is . Its value in is

39. Two people measure the same stick using their own handspans and obtain different numbers. The best explanation is that

40. The expression is meaningful as a measurement because

41. The dimensional formula of area is

42. A screw gauge has least count . The main scale reading is , the circular scale reading is , and the zero error is . The corrected reading is

43. A pressure is calculated from a force reading acting on a circular area of diameter . Since , the maximum percentage error in is

44. Four length readings are , , , and . The arithmetic mean is

45. A total length is made from three measured parts: , , and . The combined length with maximum absolute error is

46. Acceleration has the SI unit because it describes change in

47. Six identical washers have total mass . The mass of one washer, reported using the correct significant-figure idea, is

48. The prefix in SI notation represents the factor

49. A proposed equation is , where is energy, is mass, is velocity, is force, and is displacement. The equation fails dimensional homogeneity because

50. Pressure is force per unit area. Its SI unit in base-unit form is