1.
When measuring the length of an object using a ruler, where should you start the measurement?
Correct Answer
A. At the very beginning of the ruler (0 cm or 0 inches)
Explanation
You should always start your measurement from the very beginning of the ruler (0 cm or 0 inches) to ensure accuracy and consistency. Starting at the midpoint or any other point on the ruler may introduce measurement errors. Starting at the end of the ruler is not the correct practice; you should use the 0 cm or 0 inches mark as the starting point. Using any convenient point on the ruler may lead to inconsistent measurements.
2.
A student used a vernier caliper to measure the diameter of a wooden cylinder. The diagram shows an enlargement of the caliper scales. What reading was recorded?
Correct Answer
B. 1.64 cm
Explanation
The reading recorded on the vernier caliper is 1.64 cm. This can be determined by aligning the zero mark on the vernier scale with the closest mark on the main scale, which is 1.6 cm. Then, counting the number of divisions on the vernier scale that align with the divisions on the main scale, we find that the 4th division on the vernier scale aligns with a division on the main scale. Each division on the vernier scale represents 0.01 cm, so adding 0.04 cm to the main scale reading of 1.6 cm gives a total reading of 1.64 cm.
3.
The diagram shows part of a micrometer screw gauge.
What is the reading shown?
Correct Answer
C. 5.81 mm
Explanation
The reading shown on the micrometer screw gauge is 5.81 mm. This can be determined by looking at the position of the thimble and the main scale. The thimble is between the 5 and 6 mark on the main scale, and the line on the thimble is aligned with the 0 mark on the main scale. The number on the thimble that aligns with the main scale is 8, indicating a measurement of 0.08 mm. Adding this to the measurement on the main scale (5.73 mm) gives a total reading of 5.81 mm.
4.
The diagram shows a micrometer. Which reading is shown?
Correct Answer
B. 2.73 mm
Explanation
Based on the diagram of the micrometer, the reading shown is 2.73 mm. This is determined by looking at the position of the thimble and the main scale. The thimble is aligned with the 2.7 mm mark on the main scale, and one additional division on the thimble corresponds to 0.03 mm. Therefore, the total reading is 2.73 mm.
5.
The diagram below shows part of a micrometer screw gauge. What is the reading?
Correct Answer
C. 5.87 mm
6.
The diagram below shows part of a micrometer screw gauge.
What is the reading shown?
Correct Answer
B. 4.51 mm
Explanation
The reading shown on the micrometer screw gauge is 4.51 mm. This can be determined by looking at the position of the thimble and the main scale. The thimble is aligned with the 4 on the main scale and the line on the thimble is between the 5 and 6 on the main scale, indicating an additional 0.01 mm. Therefore, the total reading is 4.51 mm.
7.
The precision of a vernier caliper is _______ millimeters.
Correct Answer
0.1
Explanation
The precision of a vernier caliper is 0.1 millimeters. This means that the calipers can measure up to one-tenth of a millimeter accurately. The vernier scale on the calipers allows for precise measurements by providing additional decimal places beyond the main scale. Therefore, the calipers can measure with a precision of 0.1 millimeters.
8.
The precision of a micrometer screw gauge is 0.001 cm
Correct Answer
A. True
Explanation
The precision of a micrometer screw gauge is 0.001 cm, meaning that it can measure up to the nearest thousandth of a centimeter. This indicates that the micrometer screw gauge is capable of providing highly accurate and precise measurements. Therefore, the statement is true.
9.
A student used a vernier caliper to measure the length of a small wooden block.
The diagram shows an enlargement of the caliper scales. What reading was recorded?
Correct Answer
C. 1.26 cm
Explanation
Based on the diagram of the vernier caliper scales, it can be observed that the zero mark on the vernier scale aligns with the 1.2 cm mark on the main scale. Additionally, the 0.06 cm mark on the vernier scale aligns with the 1.26 cm mark on the main scale. Therefore, the reading recorded on the vernier caliper is 1.26 cm.
10.
The diagram shows part of a vernier caliper.
Correct Answer
C. 4.37 cm