Number and Number Sense, Negative exponents and manipulation, Math online test for Grade 8 at myTestBook.com

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<< back	This is a SAMPLE test for Grade: 8, Subject: Math
	Test Topic(s): Number and Number Sense, Negative exponents and manipulation

Question 1:

Which of the following is better suited for the use of negative exponents?

Size of balls in centimeter.

Height of buildings in meter.

Size of plant cells in meter.

Length of earth worms in inches.

Question 2:

What is the value of the following expression?

3.23 × 10⁻⁴

0.000323

32,300

0.323

0.0000323

Question 3:

Represent 0.000005235 in scientific notation.

5.235 × 10⁻⁹

5,235 × 10⁻⁶

5.235 × 10⁻⁶

5.235 × 10⁻⁵

Question 4:

Convert 0.00000000895 Meter into scientific notation.

8,95 × 10⁻¹¹ Meter

8.95 × 10⁻⁹ Meter

8.95 × 10⁻¹⁰ Meter

89.5 × 10⁻⁹ Meter

Question 5:

9.67 × 10 ⁻⁷ − 2.67 × 10 ⁻⁷ = ?

7.0 × 10 ⁻⁰

7.67 × 10 ⁻⁷

7.0 × 10 ⁻⁷

11.0 × 10 ⁻⁸

Question 6:

2.22 × 10 ⁻¹¹ + 2.22 × 10 ⁻¹¹ = ?

4.44 × 10 ⁻¹¹

4.44 × 10 ⁻²²

2.22 × 10 ⁻²²

2.22 × 10 ⁻¹⁰

Question 7:

Size of a plant cell is 5.00 × 10 ⁻⁷ meter. If 20 such cells are placed in a line; how long line will they make?

1.00 × 10 ⁻⁶ meter

1.00 × 10 ⁻⁵ meter

20.00 × 10 ⁻⁵ meter

5.00 × 10 ⁻⁵ meter

Question 8:

Tim coated a 1.0 × 10 ⁻⁴ m thick layer of reflective material, which was ten times thicker then his professor wanted. What thickness of the reflective material did the professor want?

1.0 × 10 ⁻⁵ m

1.0 × 10 ⁻⁴ m

1.0 × 10 ⁻⁶ m

11.0 × 10 ⁻⁵ m

Question 9:

(4 × 10 ⁻⁴) × 10,000 = ?

4 × 10 ⁻³

4 × 10 ²

4 × 10 ⁻¹

Question 10:

(4 × 10 ⁻⁴) ÷ 1,000 = ?

4,000 × 10 ⁻⁷

4 × 10 ⁻⁸

4 × 10 ⁻⁷

4 × 10 ⁻⁶

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