Physical Quantities and Measurement

Physics, SSC-Punjab Class 9. This chapter is split into 43 topics and has 1,055 practice questions. The topics covered are listed below, followed by 10 free sample questions from the chapter.

Topics in this chapter

1. Zero Error of Vernier Callipers 23 questions
2. Reading a Micrometer Screw Gauge 23 questions
3. Measuring Cylinder and Volume of Liquids 24 questions
4. Time Measuring Instruments 27 questions
5. Least Count of Micrometer Screw Gauge 23 questions
6. Least Count of Vernier Callipers 22 questions
7. Measurement, Unit and Standard 23 questions
8. Multiples of Mass and Length (Tables 1.5 and 1.6) 24 questions
9. Rules for Writing SI Units and Symbols 24 questions
10. Scientific Notation: Concept and Rules 23 questions
11. Addition and Subtraction in Scientific Notation 24 questions
12. Micrometer Screw Gauge: Parts and Principle 24 questions
13. Exercise Short and Comprehensive Questions of Chapter 1 30 questions
14. Parallax Error 20 questions
15. Worked Examples 1.1 and 1.2 and Quick Quizzes 21 questions
16. Choosing Length Instruments and Their Limitations 24 questions
17. Volume of a Solid: Displacement Methods 23 questions
18. Reading Vernier Callipers 24 questions
19. Identifying Types of Experimental Errors 21 questions
20. Zero Error of Micrometer Screw Gauge 22 questions
21. Metre Rule, Measuring Tape and Least Count 22 questions
22. SI Base Units: Names and Symbols 30 questions
23. Exercise Numericals of Chapter 1 26 questions
24. Systematic Errors 22 questions
25. Multiplication and Division in Scientific Notation 24 questions
26. Converting Units with Prefixes 28 questions
27. Physical and Non-physical Quantities 24 questions
28. Significant Figures: Concept and Rules 24 questions
29. Precision and Accuracy 25 questions
30. Key Points and Do You Know Facts of Chapter 1 23 questions
31. Base and Derived Physical Quantities 24 questions
32. Rounding off the Digits 30 questions
33. Writing Numbers in Scientific Notation 28 questions
34. Average Values, Pendulum Period and Multiple Readings 30 questions
35. Derived Units 27 questions
36. SI Prefixes: Symbols and Powers of Ten 30 questions
37. Counting Significant Figures 30 questions
38. Vernier Callipers: Parts and Use 24 questions
39. Exercise Multiple Choice Questions of Chapter 1 22 questions
40. Mass Measuring Instruments: Physical Balance 24 questions
41. Random Errors 23 questions
42. Errors in Measurements and Human Errors 23 questions
43. Uncertainty in a Measurement 23 questions

Sample questions: Physical Quantities and Measurement

10 sample questions with the correct answer and an explanation. Try to answer each one before reading the explanation.

Q1. Most symbols appear in lower case, for example m for metre and s for second. The only exception is:

• A. L for litre(correct answer)
• B. K for kelvin
• C. N for newton
• D. kg for kilogram

Answer: A.The text gives L for litre as the only exception among lower-case symbols; the other capitals are for names after scientists.

Q2. In the second step, the knob is turned so that:

• A. the pointer is removed
• B. the pans of the balance are raised up and the beam and pointer are checked(correct answer)
• C. the balance is switched on
• D. the object is lifted

Answer: B.Step 2: turn the knob so that the pans are raised up and check whether the beam is horizontal and the pointer at the centre of the scale.

Q3. What kind of experimental error does this situation illustrate? The observer takes a long time to press the stopwatch button after the start of a race.

• A. a calibration error
• B. a zero error
• C. a human error(correct answer)
• D. a systematic error of the unit

Answer: C.Given its cause (the observer takes a long time to press the stopwatch button after the start of a race), the error is a human error.

Q4. What kind of experimental error does this situation illustrate? A scale was printed with divisions that are all slightly too close together.

• A. a parallax error
• B. a human error
• C. a systematic error (incorrect marking)(correct answer)
• D. a random error

Answer: C.Given its cause (a scale was printed with divisions that are all slightly too close together), the error is a systematic error (incorrect marking).

Q5. What kind of experimental error does this situation illustrate? A thermometer reading varies because the room temperature changes unpredictably during the experiment.

• A. a zero error
• B. a systematic error
• C. a human error
• D. a random error(correct answer)

Answer: D.Given its cause (a thermometer reading varies because the room temperature changes unpredictably during the experiment), the error is a random error.

Q6. What kind of experimental error does this situation illustrate? A spring balance is not adjusted to read zero when nothing is hung on it.

• A. a human error
• B. a systematic error (zero error)(correct answer)
• C. a parallax error
• D. a random error

Answer: B.Given its cause (a spring balance is not adjusted to read zero when nothing is hung on it), the error is a systematic error (zero error).

Q7. What kind of experimental error does this situation illustrate? A micrometer screw gauge reads 0.05 mm when the anvil and spindle touch.

• A. a systematic error (zero error)(correct answer)
• B. a random error
• C. a human error
• D. a parallax error

Answer: A.Given its cause (a micrometer screw gauge reads 0.05 mm when the anvil and spindle touch), the error is a systematic error (zero error).

Q8. What kind of experimental error does this situation illustrate? A stopwatch is started too early on some trials and too late on others by the same person.

• A. a human error(correct answer)
• B. a systematic error
• C. a calibration error
• D. a zero error

Answer: A.Given its cause (a stopwatch is started too early on some trials and too late on others by the same person), the error is a human error.

Q9. Why is it important to record the observation in significant figures?

• A. To make the number look longer
• B. To reflect the degree of uncertainty in the measurement(correct answer)
• C. To avoid using instruments
• D. To change the unit

Answer: B.The book says it is important to reflect the degree of uncertainty in the measurement by recording the observation in significant figures.

Q10. Exercise B1.6: Which of these lists gives the SI base units with their symbols correctly?

• A. metre (m), kilogram (kg), minute (min), kelvin (K), ampere (A), candela (cd), mole (mol)
• B. metre (m), kilogram (kg), second (s), degree (°), ampere (A), candela (cd), mole (mol)
• C. metre (m), kilogram (kg), second (s), kelvin (K), ampere (A), candela (cd), mole (mol)(correct answer)
• D. metre (M), gram (g), second (s), kelvin (k), ampere (a), candela (c), mole (m)

Answer: C.This is Table 1.2. So the correct answer is: metre (m), kilogram (kg), second (s), kelvin (K), ampere (A), candela (cd), mole (mol).