Test: Significant Figures - Grade 12 MCQ

The correct answer is 5. The zeros preceding 2 are not significant.

The volume of the box is length x width x height = 103.5. This number, rounded off to 3 significant digits becomes 104.

The correct answer is 4. All the digits in the given number are significant.

The correct answer is 7. The zeros after 6 in the decimal part are also significant.

Volume of a cube is equaled to its length cubed, therefore, required volume = 12.167 cm³. The 67 in the end will be rounded off to 7, hence the final number becomes 12.17.

According to the rounding off rules, if the digit to be removed is 5 and the following digit is not zero, then the last remaining digit is increased by one.
Given number = 75.66852
After applying rounding rules, 852 rounds off to 9
Hence, the final answer will be “75.669”.

The correct answer is 5. While calculating the number of significant digits, we need not consider the zero preceding 2.

Here the number of significant digits is 4. In standard scientific form, we need not consider the zeros after 9 and need to bring the value between 1 and 9 in the first place.

The number of significant digits is 6. The zeros after the decimal are also significant.

Area of rectangle is length multiplied by breadth. The area of this rectangle is 4.5 × 5.9 mm² = 26.55 mm².