Scientific Notation Quiz_Evaluation

Which of the following best describes scientific notation?

• A way to write only small numbers.

• A method to express very large or very small numbers using exponents.

• A technique to round numbers to the nearest whole number.

• A system used only in space research.

The distance from Earth to the Sun is 150,000,000 km. What is its scientific notation?

• 1.5 × 10⁶ km

• 15 × 10⁷ km

• 1.5 × 10⁸ km

• 150 × 10⁶ km

The diameter of a human hair is approximately 0.000075 meters. How is this written in scientific notation?

• 7.5 × 10⁴ m

• 7.5 × 10⁻⁵ m

• 0.75 × 10⁻⁴ m

• 7.5 × 10⁻³ m

If the speed of light is 300,000,000 m/s, how can it be written in scientific notation?

• 3 × 10⁸ m/s

• 30 × 10⁷ m/s

• 3 × 10⁶ m/s

• 3.0 × 10⁹ m/s

What happens to the exponent in scientific notation when expressing a small number (less than 1)?

• It becomes positive.

• It remains 0.

• It becomes negative.

• It turns into a fraction.

The distance between Earth and the Moon is approximately 384,400 km. How is this written in scientific notation?

• 3.844 × 10⁵ km

• 38.44 × 10⁴ km

• 3.844 × 10⁶ km

• 3844 × 10² km

The size of a dust particle is 0.00000031 m. Which of the following is the correct scientific notation?

• 3.1 × 10⁶ m

• 3.1 × 10⁻⁷ m

• 0.31 × 10⁻⁶ m

• 3.1 × 10⁸ m

Which of the following numbers is NOT in scientific notation?

• 2.5 × 10⁴

• 5.67 × 10⁻³

• 23 × 10⁶

• 9.8 × 10²

The distance between Villamor Airbase, Philippines, and The Hague, Netherlands, is approximately 10,600 km. What is its scientific notation?

• 1.06 × 10³ km

• 1.06 × 10⁴ km

• 10.6 × 10³ km

• 1.06 × 10⁵ km

Why do scientists use scientific notation when dealing with space measurements?

• To confuse people who are not scientists.

• To make numbers appear larger than they are.

• To simplify writing and comparing very large or very small numbers.

• To avoid using decimals.