Measurements and Experimentation Quiz - ICSE Class 9 Physics

Free practice quiz: Measurements and Experimentation (ICSE Class 9 Physics). 53 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 9 Physics practice quiz has 53 multiple-choice questions on Measurements and Experimentation, 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. A screw gauge has a pitch of 0.5 mm and a circular scale with 100 divisions. What is the least count of the screw gauge?

   1. 0.005 mm
   2. 0.05 mm
   3. 0.0005 mm
   4. 0.5 mm
   Show answer

   Answer: A. 0.005 mm

   The least count of a screw gauge is calculated by dividing the pitch by the number of divisions on the circular scale. Least Count = Pitch / Number of divisions on circular scale = 0.5 mm / 100 = 0.005 mm.

2. The pitch of a screw gauge is 0.5 mm. If there are 100 divisions on the circular scale, what is the smallest distance that can be measured accurately?

   1. 0.05 mm
   2. 0.005 mm
   3. 0.5 mm
   4. 0.1 mm
   Show answer

   Answer: B. 0.005 mm

   The smallest distance that can be measured accurately is the least count. Least Count = Pitch / Number of divisions on circular scale = 0.5 mm / 100 = 0.005 mm.

3. Which instrument is most suitable for measuring the diameter of a thin wire with high precision?

   1. Meter scale
   2. Measuring tape
   3. Screw gauge
   4. Spring balance
   Show answer

   Answer: C. Screw gauge

   A screw gauge is specifically designed to measure small lengths, like the diameter of a thin wire or the thickness of a sheet, with a high degree of precision (typically up to 0.01 mm). A meter scale or measuring tape has much lower precision, and a spring balance measures force.

4. When measuring the length of a pencil, if the zero of the vernier scale is to the right of the zero of the main scale, the zero error is:

   1. Negative
   2. Positive
   3. Zero
   4. Either positive or negative
   Show answer

   Answer: B. Positive

   If the zero of the vernier scale is to the right of the zero of the main scale when the jaws are closed, it means the instrument reads more than the actual value. This is a positive zero error.

5. A vernier caliper has 100 divisions on its vernier scale, and it is designed to measure up to 10 cm with a least count of 0.01 cm. How many divisions are there on its main scale for 1 cm?

   1. 10 divisions
   2. 100 divisions
   3. 50 divisions
   4. 20 divisions
   Show answer

   Answer: A. 10 divisions

   Least Count = Value of 1 MSD - Value of 1 VSD. We know LC = 0.01 cm. Also, 100 VSD = 99 MSD (standard configuration for this LC and range). Value of 1 MSD = 1 cm / (number of divisions on main scale for 1 cm). Let this be 'm'. Then Value of 1 VSD = (99/100) * m. So, 0.01 cm = m - (99/100) * m = m * (1 - 99/100) = m * (1/100). Therefore, m = 0.01 cm * 100 = 1 cm. This means there is 1 division on the main scale for every 1 cm. Thus, for 1 cm of main scale length, there is 1 division on the main scale.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Which of the following instruments is used to measure very small distances with high precision?
2. If the zero error of a vernier caliper is positive and equal to 0.03 cm, what is the corrected reading if the observed reading is 4.52 cm?
3. In a screw gauge, the main scale reading is 1 mm and the vernier scale coincidence is on the 35th division. The pitch of the screw gauge is 1 mm and the circular scale has 100 divisions. What is the measured length?
4. Which of the following best describes random error in a measurement?
5. A student is measuring the diameter of a wire using a screw gauge. The main scale reads 0 mm. The 50th division on the circular scale coincides with the datum line. The least count of the screw gauge is 0.01 mm. What is the diameter of the wire?
6. What is the primary advantage of using a vernier caliper over a meter scale for measuring length?
7. If a screw gauge has a pitch of 1 mm and 50 divisions on its circular scale, what is its least count?
8. A systematic error in a measurement is best characterized by:
9. When measuring the thickness of a thin sheet with a vernier caliper, the main scale reading is 1.2 cm and the 7th division of the vernier scale coincides with a main scale division. The least count of the vernier caliper is 0.01 cm. What is the thickness of the sheet?
10. Which of the following statements about parallax error is correct?
11. A vernier caliper has 10 divisions on the vernier scale that coincide with 9 divisions on the main scale. The smallest division on the main scale is 1 mm. What is the least count of the vernier caliper?
12. When using a screw gauge, if the zero mark of the circular scale is below the datum line, the zero error is:
13. If the pitch of a screw gauge is P and the number of divisions on the circular scale is N, what is the least count?
14. Which of the following measurements is likely to have the largest percentage error?
15. In an experiment, a student obtains the following readings for the length of an object: 5.2 cm, 5.3 cm, 5.1 cm, 5.2 cm, 5.3 cm. What is the mean absolute error of the measurement?
16. A digital thermometer has a resolution of 0.1°C. This means:
17. What is the difference between precision and accuracy in measurements?
18. A screw gauge has a pitch of 1 mm. If the circular scale has 100 divisions, what is the least count?
19. If the main scale reading on a vernier caliper is 3.5 cm and the vernier coincidence is on the 6th division, with a least count of 0.01 cm, what is the measured length?
20. What does it mean if a vernier caliper has a zero error of -0.04 cm?
21. If the pitch of a screw gauge is 0.5 mm and its circular scale has 50 divisions, what is the least count?
22. Consider a measurement with a systematic error. If the true value is 10 units and the systematic error causes the measurement to be consistently 0.5 units higher, what is the measured value?
23. What is the primary purpose of a zero correction in measurement?
24. A student measures the diameter of a coin using a vernier caliper. The main scale reading is 2.1 cm. The 5th vernier scale division coincides with a main scale division. The least count is 0.01 cm. What is the diameter?
25. When using a screw gauge, if the 30th division on the circular scale coincides with the datum line, and the pitch is 0.5 mm, what is the reading from the circular scale?
26. Which of the following is an example of a random error?
27. A vernier caliper has 10 main scale divisions equal to 1 cm. The vernier scale has 10 divisions, and 9 main scale divisions. What is the least count of the vernier caliper?
28. If a screw gauge has a pitch of 1 mm and its circular scale is divided into 100 parts, what is the minimum reading that can be taken?
29. A student measures the diameter of a sphere using a screw gauge. The main scale reading is 2 mm. The 45th division on the circular scale coincides with the datum line. The least count is 0.01 mm. What is the diameter?
30. Which error tends to affect measurements in a consistent direction?
31. What is the unit of Least Count for a vernier caliper typically expressed in?
32. If a vernier caliper has 10 vernier divisions equal to 9 main scale divisions, and one main scale division is 1 mm, what is the value of one vernier scale division?
33. The pitch of a screw gauge is 1 mm. If the circular scale has 50 divisions, what is the least count?
34. Which of the following is NOT a source of systematic error?
35. A vernier caliper has a least count of 0.01 cm. If the main scale reading is 5.0 cm and the vernier scale reading is 0.06 cm, what is the total measured length?
36. The pitch of a screw gauge is 0.5 mm. If the circular scale is divided into 100 divisions, what is the smallest measurement possible?
37. If you are measuring the diameter of a small sphere and the screw gauge shows a main scale reading of 3 mm and the 72nd division on the circular scale coincides, what is the diameter if the least count is 0.01 mm?
38. Which of the following represents the most precise measurement?
39. In a screw gauge, if the pitch is 1 mm and the circular scale has 50 divisions, what is the value of one division on the circular scale?
40. Which statement about significant figures is correct?
41. A vernier caliper has 1 main scale division = 1 mm. The vernier scale has 10 divisions, and 10 VSD = 9 MSD. If the zero error is positive and the zero of the vernier scale coincides with the 6th division of the main scale after the zero mark, what is the zero correction?
42. Which unit is used to measure density in SI system?
43. What is the formula for the least count of a vernier caliper?
44. If a screw gauge has a pitch of 0.5 mm and the circular scale has 100 divisions, what is the least count?
45. When measuring the length of a table with a meter scale, which of the following is the most likely source of error if the observer's eye is not directly above the mark being read?
46. A vernier caliper has 10 divisions on the vernier scale that coincide with 9 divisions on the main scale. The smallest division on the main scale is 0.5 mm. What is the least count?
47. If the zero error of a screw gauge is found to be -0.02 mm, what is the zero correction required?
48. The pitch of a screw gauge is 1 mm. If the circular scale has 100 divisions, what is the least count?

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