Question

Select all that apply. Which of the following measurements have 1 significant figure?

Answer 1

Answer : The correct options are, 0.007, 7000

Explanation :

Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.

Rules for significant figures:

• Digits from 1 to 9 are always significant and have infinite number of significant figures.
• All non-zero numbers are always significant. For example: 654, 6.54 and 65.4 all have three significant figures.
• All zero’s between integers are always significant. For example: 5005, 5.005 and 50.05 all have four significant figures.
• All zero’s preceding the first integers are never significant. For example: 0.0078 has two significant figures.
• All zero’s after the decimal point are always significant. For example: 4.500, 45.00 and 450.0 all have four significant figures.
• All zeroes used solely for spacing the decimal point are not significant. For example : 8000 has one significant figure.

As per question,

0.007 and 7000 has one significant figure.

7000.0 has 5 significant figures.

7 has infinite significant figures.

Hence, the correct options are, 0.007, 7000

Answer 2

The Answer will be
A, B, and D

Not entirely sure though, comment if I'm wrong about this or delete this so no one else gets it wrong if it is