Accuracy Science Practice Sets - ObjectiveMCQ

Accuracy in Science

4 practice sets · Page 1 of 1

Question 1

Open practice

Which of the following is a chemical property of a substance?

A: Solubility of Sodium Chloride in Water = 35 g/100mL

B: Melting Point of Water = 0°C

C: Cadmium metal dissolves in Nitric Acid, producing a blue tinted solution.

D: Density of Hexane = 0.67 g/mL

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Answer and explanation

Correct Answer: C — C: Cadmium metal dissolves in Nitric Acid, producing a blue tinted solution.

A chemical property describes how a substance undergoes a chemical reaction. Cadmium reacting with nitric acid forms new substances (cadmium nitrate), producing a blue solution. The other options are physical properties.

Question 2

Open practice

What is the result of the following calculation, reported to the correct number of significant figures? $0.12\,\text{g} + 0.003\,\text{g} = ?$

A: 0.123g

B: 0.12g

C: 0.1g

D: 0.g

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Answer and explanation

Correct Answer: B — B: 0.12g

For addition, the number of decimal places must match the term with the fewest decimal places.

$0.12$ has 2 decimal places
$0.003$ has 3 decimal places
The sum is:

0.12 + 0.003 = 0.123

Rounded to 2 decimal places:

0.123 \rightarrow 0.12\,\text{g}

Question 3

Open practice

Which of the following is an extensive physical property of matter?

A: length

B: melting point

C: color

D: freezing point

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Answer and explanation

Correct Answer: A — A: length

Extensive properties depend on the amount of matter. Length changes when the amount of material changes, while color and melting/freezing points are intensive properties that do not depend on sample size.

Question 4

Open practice

Five darts strike near the center of the target. Whoever threw the darts is

A: accurate.

B: precise.

C: both accurate and precise.

D: neither accurate and precise.

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Answer and explanation

Correct Answer: C — C: both accurate and precise.

Accuracy means hitting close to the true value (center). Precision means repeated hits are close together. Since all darts land close to the center and close to each other, the thrower is both accurate and precise.

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Accuracy in Science