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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Rounds attempted: 0

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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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Units and Measurements – Progressive Test

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1 / 50

1. The dimension of pressure can be found from . The correct dimensional formula is

2 / 50

2. A stopwatch records oscillations in . The period is used in , with . The maximum percentage error in is closest to

3 / 50

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

4 / 50

4. The thickness of one very thin sheet is better estimated by measuring a stack because

a) averaging makes the instrument least count zero

b) the unit of thickness changes into time

c) one sheet has no physical thickness

d) a stack gives a larger measurable thickness

5 / 50

5. The rounded form of to three significant figures is

6 / 50

6. Relative error has no unit because it is formed by

a) multiplying error by the measured value

b) dividing quantities with the same unit

c) adding two values with different units

d) changing every unit into

7 / 50

7. A pressure of is expressed in . Given and , the value is

8 / 50

8. A spring constant has SI unit . If , its value in is

9 / 50

9. The product , reported with the proper significant-figure rule, should be written as

10 / 50

10. A measurement record is given below.

A rectangular plate has length and breadth . Its area is calculated from .

The area with maximum percentage error is best reported as

a) with error

b) with error

c) with error

d) with error

11 / 50

11. A speed is calculated using . The readings are , , , and . The speed and maximum percentage error are closest to

a) and

b) and

c) and

d) and

12 / 50

12. A reported length means that the measurement is best read as

a) with uncertainty

b) a dimensionless number because of the sign

c) as an exact value with no uncertainty

d) multiplied by

13 / 50

13. 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

14 / 50

14. In a parallax experiment, two observation points and are apart. A distant object appears shifted by a small angle of . The distance of the object is

15 / 50

15. If , with percentage errors in and in , the maximum percentage error in is

16 / 50

16. Power is work done per unit time. Its SI unit is

17 / 50

17. Assertion: In , the maximum absolute error is .
Reason: The largest uncertainty in a difference can occur when one measured value is overestimated and the other is underestimated.

a) Assertion is true, but Reason is false

b) Both Assertion and Reason are true, but Reason does not explain Assertion

c) Both Assertion and Reason are true, and Reason explains Assertion

d) Assertion is false, but Reason is true

18 / 50

18. A physical quantity is best described as a property that can be

a) measured with value and unit

b) memorised without measurement

c) changed into a unit symbol

d) named without any comparison

19 / 50

19. A thermometer gives readings , , and for water actually boiling at under the given conditions. The readings are best described as

a) precise but inaccurate

b) neither precise nor inaccurate

c) accurate because the readings are repeated

d) accurate and imprecise

20 / 50

20. 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

21 / 50

21. A work value is . Using , its value in is

22 / 50

22. The expression for speed becomes meaningful in SI when the blank is filled as , so the unit is ______.

23 / 50

23. The sum should be reported as

24 / 50

24. Dimensional analysis can be used to

a) find the exact numerical value of every dimensionless constant

b) decide whether an experiment was performed carefully

c) check the dimensional consistency of a physical equation

d) replace measurement by guessing

25 / 50

25. A measurement is changed from to . The new numerical value is

26 / 50

26. 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

27 / 50

27. A physical quantity has dimensions . Its numerical value is in a system where the base units are , , and . If a new system uses , , and as base units, the new numerical value of is

28 / 50

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

a) only the name of the physical quantity

b) precision, because the unit is too small

c) accuracy, through a fixed shift

d) only the number of significant figures

29 / 50

29. A row of identical fine wires placed side by side has total width . The estimated diameter of one wire is

30 / 50

30. The area under a power-time graph has the dimension of

a) energy

b) acceleration

c) pressure

d) force

31 / 50

31. A parallax angle must be used in radians in the relation because

a) metre can be converted only into radian

b) degree is not a unit of angle

c) baseline has no unit in this method

d) radian measure is a length ratio

32 / 50

32. For a mass-spring system, , where is time period and is mass. The dimensional formula of must be

33 / 50

33. A quantity is calculated from . If the percentage error in is and the percentage error in is , the maximum percentage error in is

34 / 50

34. A prefix record shows the following entries.

Record	Prefix symbol	Power of ten
P
Q
R
S

The entry that needs correction is

a) S

b) P

c) R

d) Q

35 / 50

35. The small-angle relation used in a basic parallax estimate is

36 / 50

36. To convert the numerical value of a quantity from one system of units to another, the dimensional formula is useful because it tells

a) the colour of the measuring instrument

b) how the unit depends on base units

c) the exact experimental error in every reading

d) the number of digits after the decimal point

37 / 50

37. A car covers in . Its average speed in SI unit is

38 / 50

38. A reading set for a time period is , , , and . If is calculated using , and is taken as exact for this question, the approximate percentage uncertainty in using mean absolute error in is

39 / 50

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

a) area is expressed using a square unit

b) the unit measures time

c) area and length are the same quantity

d) the number alone is the complete measurement

40 / 50

40. A formula card contains the following derived-unit links.
I.
II.
III.
IV.
The links that are valid are

a) II and IV only

b) I and IV only

c) I, II and III only

d) I, III and IV only

41 / 50

41. The expression is meaningful as a measurement because

a) is a decimal number

b) a value with a defined time unit

c) any symbol after a number makes a standard unit

d) is written after the number

42 / 50

42. A screw gauge has pitch and circular scale divisions. It measures the diameter of a wire with main scale reading , circular scale reading , and zero error . The cross-sectional area of the wire, using , is closest to

43 / 50

43. A length is measured with a ruler whose zero mark is broken, so all readings are taken from the mark and subtracted properly at the end. This procedure mainly helps to

a) increase the least count of the ruler

b) convert length into mass

c) make every reading random

d) reduce the damaged-zero effect

44 / 50

44. The equation is dimensionally valid because every term has the dimension

45 / 50

45. In the relation , where is force and is displacement, the dimensional formula of is

46 / 50

46. The zeros in are significant because they are

a) leading zeros before the first non-zero digit

b) powers of ten only

c) unit symbols written as digits

d) captive zeros between non-zero digits

47 / 50

47. For readings , , and , the reported value using mean and mean absolute error is approximately

48 / 50

48. A formula contains the constant factor , as in . If only is measured, the uncertainty in comes from

a) only

b) both and equally

c) neither nor

d) only

49 / 50

49. A calculator gives . The properly reported sum is

50 / 50

50. A mass is recorded as . Its value in is

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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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