Class 11 Physics: Units & Measurements Mock Test

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Quiz: Units and Measurements – Progressive Test
Total questions: 394
Questions in this round: 50
Time allotted: 70 minutes
Pass score: 60%
Total rounds: 8
Current round: 1^st
Rounds passed: 0 / 8
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Quiz: Units and Measurements – Certificate Challenge
Total questions: 394
Questions to attempt: 100 random
Time allotted: 100 minutes
Certificate pass score: 70%
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Certificate: Yes
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Progressive Test — Guest First Round

Units and Measurements – Progressive Test

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1 / 50

1. Strain is defined as . Its dimensional formula is

2 / 50

2. A table lists some SI base-unit symbols.

Quantity	Recorded unit symbol
P. Length
Q. Mass
R. Time
S. Luminous intensity

The row that needs repair is

a) Q

b) S

c) R

d) P

3 / 50

3. A ruler has equal divisions between and . Its least count is

4 / 50

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

5 / 50

5. A measurement label shows without spacing. In standard writing, it is better written as

6 / 50

6. A bottle label gives volume , a package gives mass , and a stopwatch gives time . These records all show that measured quantities are written with

a) a shape and a material

b) only an instrument reading

c) only a unit name

d) a number and a unit

7 / 50

7. A relation has the form , where is displacement and is time. The dimensions of and , respectively, are

a) and

b) and

c) and

d) and

8 / 50

8. The parallax method is useful for very large distances because

a) it avoids direct measurement across the whole distance

b) it works only when the distance is exactly

c) it removes the need to measure any angle

d) it changes a large distance into a mass measurement

9 / 50

9. A screw gauge gives an observed diameter of . Its zero error is . The corrected diameter is

10 / 50

10. A direct measurement method is unsuitable for very large astronomical distances mainly because

a) length has no SI unit for large values

b) a standard cannot be placed across them

c) no physical quantity is involved

d) large distances cannot be written in scientific notation

11 / 50

11. A reading record for a vernier callipers is shown below.

Quantity	Value
Main scale reading
Coinciding vernier division
Least count

The observed reading is

12 / 50

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

13 / 50

13. A formula is proposed for force. Dimensional analysis shows that it is

a) invalid because it has dimension

b) invalid because it is dimensionless

c) dimensionally valid

d) invalid because it has dimension

14 / 50

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

a) ignores all dimensions of physical quantities

b) changes variables into unitless numbers

c) always gives the exact coefficient in the equation

d) it checks dimensions, not the full physical law

15 / 50

15. The rounded form of to three significant figures is

16 / 50

16. A length is measured three times as , , and , while the true length is . The set is best described as

a) precise but far from the true value

b) meaningless because all readings have units

c) accurate on average but not very precise

d) precise and highly accurate

17 / 50

17. Power is defined as work done per unit time. Its dimensional formula is

18 / 50

18. A passage from a measurement record is given below.

A small current is measured several times with the same ammeter. The readings fluctuate slightly because of tiny changes in contact resistance and pointer position. No constant zero shift is detected.

The most suitable way to report the best estimate is to

a) choose only the first reading

b) remove the unit from the final value

c) take the mean of the repeated readings

d) add all readings and keep the sum as the current

19 / 50

19. A measurement record uses . If the unit is replaced by a unit that is twice as large, the new numerical value for the same becomes

20 / 50

20. The difference between an instant and a time interval is that

a) both must have the same numerical value

b) both describe only one fixed reading of a clock

c) an instant is a moment; a time interval is a duration

d) an instant is a duration; a time interval is a moment

21 / 50

21. A force is calculated from . Measurements are , , , and . The maximum percentage error in , using maximum-error rules, is approximately

22 / 50

22. A diameter is measured as with an uncertainty of . A length is measured as with an uncertainty of . The comparison of percentage errors is

a) diameter has , length has

b) diameter has , length has

c) both are

d) both are

23 / 50

23. A subtraction gives before rounding. The properly rounded result is

24 / 50

24. The statement that best describes why scientific notation is useful in measurements is

a) it makes every physical quantity dimensionless

b) it changes an approximate value into an exact value

c) it removes the need for units

d) it writes extreme values compactly

25 / 50

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

a) , , ,

b) , , ,

c) , , ,

d) , , ,

26 / 50

26. Measurement in physics means

a) comparison with a chosen standard unit

b) guessing the size of an object from its appearance

c) replacing all quantities by the same unit

d) writing only the name of a quantity without a value

27 / 50

27. A measurement note records a temperature as and a current as . The unit symbols show that

a) both quantities are measured in the same base unit

b) only temperature is a measurable physical quantity

c) temperature and current are different SI base quantities

d) is for current and is for temperature

28 / 50

28. A screw gauge has pitch and circular scale divisions. For a wire, the main scale reading is , the circular scale reading is , and the zero error is . The corrected diameter of the wire in metres is

29 / 50

29. The expression is dimensionally suitable for a time period because

a) has , so its square root has

b) and have identical dimensions in the ratio

c) has , so its square root is also length-like

d) supplies the dimension of time in the formula

30 / 50

30. A density is . Its value in is

31 / 50

31. A vernier callipers has least count . Its least count in is

32 / 50

32. A measuring device gives readings that vary unpredictably by about from trial to trial. The phrase “unpredictably from trial to trial” most directly points to

a) zero correction

b) SI unit conversion

c) random error

d) fixed calibration error

33 / 50

33. A measured value is reported as . The quantity represents

a) the mean absolute error

b) the unit of the instrument

c) the true value without uncertainty

d) the number of repeated readings

34 / 50

34. A resisting force is written as , where is speed. The dimensions of and , respectively, are

a) and

b) and

c) and

d) and

35 / 50

35. A calculator gives . The properly reported sum is

36 / 50

36. A parallax experiment uses a baseline of . The measured parallax angle is , and . The distance of the object is approximately

37 / 50

37. A table lists some power-rule applications.

Row	Relation	Percentage error in result if percentage error in is
P
Q
R
S

The row that needs repair is

a) P

b) S

c) R

d) Q

38 / 50

38. Density is defined as mass per unit volume. Its dimensional formula is

39 / 50

39. Four mass readings are , , , and . The mean value is . The absolute deviations are , , , and . The result should be reported as

40 / 50

40. The dimensional formula of area is

41 / 50

41. The missing term in the screw-gauge relation is

a) main scale reading

b) zero correction

c) number of main scale divisions

d) circular scale divisions

42 / 50

42. A formula is written as , where is displacement and is time. The dimensions of and , respectively, are

a) and

b) and

c) and

d) and

43 / 50

43. Linear momentum is given by . The dimensional formula of momentum is

44 / 50

44. A parallax measurement uses baseline . The measured angle is , with uncertainty . Taking , the distance is approximately and the maximum percentage error is approximately

a) and

b) and

c) and

d) and

45 / 50

45. A relation is given as , where is pressure, is density, is speed, and is dimensionless. The values of and are

46 / 50

46. A value of acceleration is . In , this is

47 / 50

47. From , the dimensional formula of force is

48 / 50

48. A relation has the form , where is displacement, is velocity, and is time. The dimensional formula of is

49 / 50

49. A screw gauge moves forward by in complete rotations. Its circular scale has divisions. The least count is

50 / 50

50. An experiment measuring the length of a metal rod is done at a temperature much higher than the temperature at which the scale was calibrated. The resulting shift is an example of

a) environmental systematic error

b) no measurement error because temperature has no effect

c) gross error due to wrong copying

d) random error only

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Units and Measurements Mock Test – Class 11 Physics

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Units and Measurements – Progressive Test

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