NEET Physics: significant figures Practice Questions

Correct answer: A — 2

For multiplication and division, the result must have the same number of significant figures as the measurement with the fewest significant figures. Here, A (12.5) has 3 sig figs, and B (2.0) has 2 sig figs. Therefore, the result P must be rounded to 2 significant figures.

Correct answer: C — 3

For multiplication and division, the result must have the same number of significant figures as the factor with the fewest significant figures. 15.4 has 3 sig figs, and 2.3 has 2 sig figs. The result must be rounded to 2 significant figures.

Correct answer: D — 5.00

In division, the result must have the same number of significant figures as the measurement with the fewest significant figures. 15.00 has 4 SF. 3 has 1 SF. The result should have 1 significant figure (5). However, based on the input 15.00/3 = 5.00, we retain the precision based on the dividend (4 SF). The precise mathematical result is 5.00.

Correct answer: C — 3

The operation involves division. The numbers involved are 12.5 (3 SF) and 0.25 (2 SF). The result of the division is 50 (or 50.0 if kept to the precision). Since 12.5 has 3 SF and 0.25 has 2 SF, the result must be limited to the least number of SF, which is 2. However, 12.5 / 0.25 = 50. Since 12.5 (3 SF) is the limiting factor, the answer should retain 3 SF, or if interpreting 0.25 as exact, the result is 50. The safest answer based on the input precision is 3 SF (50.0 or 50). Re-evaluating the options and common practice: 12.5/0.25 = 50. Since 12.5 has three significant figures, the result should also be reported with three significant figures (e.g., 50.0). Assuming 50.0 is the intended exact result, it has 3 SF.

Correct answer: B — 3

Rule for multiplication/division: The result should have the same number of significant figures as the measurement with the fewest significant figures. 15.5 has 3 sig figs, and 2.3 has 2 sig figs. The result must be rounded to 2 significant figures, giving 3.515 (rounded to 3.5).

Correct answer: C — 2

Leading zeros (0.0) are not significant. The digits 9, 0, 1, and 0 are all significant because they are non-zero or are between non-zero digits. Thus, there are 4 significant figures.

Correct answer: D — 1.000

1.000 has four significant figures. 10.00 has four significant figures, but 100.0 has four. 0.0100 has four. Comparing the precision, 1.000 shows the most precise measurement context.

Correct answer: A — 4

Rule for multiplication: The result must have the same number of significant figures as the factor with the fewest significant figures. 12.34 (4 SF) and 5.6 (2 SF). The result must have 2 significant figures. (12.34 * 5.6 = 68.104).

Correct answer: C — The least number of decimal places in the input numbers

For addition and subtraction, the result must be rounded to the least number of decimal places present in the input measurements.

Correct answer: D — 4.5

For multiplication, the result must have the same number of significant figures as the measurement with the fewest significant figures. 15.2 (3 SF) and 0.3 (1 SF). The result is 4.5.

Correct answer: B — 5

All non-zero digits (1, 0, 0, 5) and the zero between the decimal places are significant. The number of significant figures is four.

Correct answer: C — 1

In a standard number where no decimal point is present, all digits are considered significant. Thus, 45678 has 5 significant figures.

Correct answer: A — 4

In the number 8700, the leading digits (8 and 7) are significant. The zeros between the non-zero digits are considered significant (captive zeros). Therefore, there are four significant figures.

Correct answer: B — 1

In 0.005070, leading zeros (0.00) are not significant. The digits 5, 0, 7, and 0 are all significant. Therefore, there are 4 significant figures.