Physical Quantities and Measurement Quiz - ICSE Class 8 Science

Free practice quiz: Physical Quantities and Measurement (ICSE Class 8 Science). 53 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 8 Science practice quiz has 53 multiple-choice questions on Physical Quantities and Measurement, and 53 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which of the following is a fundamental physical quantity?

   1. Velocity
   2. Force
   3. Mass
   4. Acceleration
   Show answer

   Answer: C. Mass

   Fundamental physical quantities are those that cannot be defined in terms of other physical quantities. Mass, length, and time are examples of fundamental quantities. Velocity, force, and acceleration are derived quantities.

2. If an instrument has a negative zero error, the corrected reading is obtained by:

   1. Subtracting the zero error
   2. Adding the absolute value of the zero error
   3. Multiplying by the zero error
   4. Dividing by the zero error
   Show answer

   Answer: B. Adding the absolute value of the zero error

   A negative zero error means the instrument reads lower than the actual value. To correct this, you need to add the magnitude (absolute value) of the negative zero error to the observed reading to get the true reading.

3. A measurement is considered accurate if it is:

   1. Repeatedly close to the same value
   2. Close to the true or accepted value
   3. Expressed with many significant figures
   4. Measured using a complex instrument
   Show answer

   Answer: B. Close to the true or accepted value

   Accuracy refers to how close a measurement is to the actual or true value. Precision refers to the closeness of repeated measurements to each other.

4. If a measurement is 25.45 cm and the instrument has a least count of 0.1 cm, what is the uncertainty?

   1. ± 0.05 cm
   2. ± 0.1 cm
   3. ± 0.5 cm
   4. ± 1 cm
   Show answer

   Answer: A. ± 0.05 cm

   The uncertainty is typically half of the least count. The least count here is 0.1 cm, so the uncertainty is $\frac{0.1 ext{ cm}}{2} = \pm 0.05 ext{ cm}$.

5. Which of the following is an example of a derived quantity?

   1. Mass
   2. Length
   3. Speed
   4. Time
   Show answer

   Answer: C. Speed

   Speed is a derived quantity, defined as distance traveled per unit time (Speed = Distance / Time). Mass, length, and time are fundamental SI quantities.

More questions in this quiz

Answers and explanations are in the full quiz.

1. The SI unit of luminous intensity is:
2. A vernier caliper is used to measure:
3. What is the least count of a standard meter scale?
4. If the zero error of a measuring instrument is positive, it means:
5. The principle of parallax error is most relevant when measuring:
6. Which of the following SI prefixes represents 10^-6?
7. The SI unit of pressure is the Pascal (Pa). 1 Pascal is equal to:
8. A screw gauge is used to measure:
9. What is the correct SI unit for electric current?
10. The measurement 3.50 cm has how many significant figures?
11. Which of the following units is NOT an SI unit?
12. The least count of a vernier caliper is calculated as:
13. Precision in measurement refers to:
14. Which SI prefix means one billionth?
15. A micrometer screw gauge typically has a least count of:
16. When converting a measurement from meters to centimeters, you should:
17. Which of the following is a derived physical quantity?
18. The SI unit of thermodynamic temperature is:
19. What is the primary advantage of using scientific notation?
20. The SI unit for luminous flux is the:
21. What is the correct SI unit for electric potential difference?
22. If a reading from a measuring device is '25.4 mm', and the device's smallest division is 1 mm, what is the uncertainty in this reading?
23. Which of the following is a correct representation of '1.23 x 10^5' in standard form?
24. The SI unit of force is the:
25. When using a vernier caliper, if the zero of the vernier scale coincides with a main scale division, it indicates:
26. Precision is most affected by:
27. Which SI prefix represents $10^9$?
28. The SI unit of electric resistance is:
29. The number of significant figures in 0.00507 has:
30. Which instrument is most suitable for measuring the diameter of a thin wire?
31. Density is defined as:
32. The SI unit of time is:
33. When reading a digital thermometer, parallax error is:
34. Which SI prefix denotes a factor of one thousandth?
35. If the zero error of a screw gauge is $-0.02$ mm, the corrected reading for a measured thickness of $1.50$ mm is:
36. The SI unit for electric charge is the:
37. The SI unit of power is:
38. When using a ruler marked in millimeters, the smallest possible measurement is:
39. To convert 5 kilometers to meters, you should:
40. The SI unit for luminous intensity is the:
41. Which SI prefix denotes $10^{-9}$?
42. How many significant figures are in the number 100.0?
43. The SI unit for luminous flux is:
44. Which instrument is least suitable for measuring the thickness of a single sheet of paper?
45. The SI unit of energy is the:
46. If the main scale reading on a vernier caliper is $2.5$ cm and the vernier scale coincidence is the 6th division, with a least count of $0.01$ cm, what is the measured length?
47. Which SI prefix represents a factor of $10^{-12}$?
48. The measurement 0.020 kg has how many significant figures?

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