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8. Which imperial unit would not be reasonable to use to estimate the length of your leg?

a. foot
b. yard
c. mile
d. inch

9. Which would be the best estimate for the height of a door in a house?

a. 140 in.
b. 7 ft
c. 1000 cm
d. 100 mm

10. The base unit for the length in metric system is

a. cm
b. m
c. in.
d. yd

11. Express 0.000840 in scientific notation

a. 8.40 x 10-3
b. 8.40 x 104
c. 8.40 x 10-4
d. 8.4 x 104

12. In metric system the prefix nano- means

a. 10-9
b. 109
c. 1012
d. 10-12

13. 65.0ºC is equivalent to

a. -85.0°F
b. 85.0°F
c. 120.°F
d. 149°F

Answer :

Here are the answers to the questions:

  1. Which imperial unit would not be reasonable to use to estimate the length of your leg?

    • a. foot
    • b. yard
    • c. mile
    • d. inch

    Explanation: A mile is an extremely large unit of measurement in the imperial system, typically used for measuring long distances such as roads or journeys, not for the length of a leg.

  2. Which would be the best estimate for the height of a door in a house?

    • a. 140 in.
    • b. 7 ft
    • c. 1000 cm
    • d. 100 mm

    Explanation: A typical interior door height in a house is about 7 feet. 140 inches is equivalent to 11 feet 8 inches, which is too high for standard doors. 1000 cm and 100 mm are not standard measures for door heights.

  3. The base unit for length in the metric system is

  • a. cm
  • b. m
  • c. in
  • d. yd

Explanation: In the metric system, the base unit for length is the meter (m).

  1. Express 0.000840 in scientific notation

  • a. 8.40 x 10^{-3}
  • b. 8.40 x 10^{4}
  • c. 8.40 x 10^{-4}
  • d. 8.4 x 10^{4}

Explanation: 0.000840 can be written as 8.40 x 10^{-4} in scientific notation, where the decimal point is moved four places to the right, giving the exponent -4.

  1. In the metric system, the prefix nano- means

  • a. 10^{-9}
  • b. 10^{9}
  • c. 10^{12}
  • d. 10^{-12}

Explanation: In the metric system, the prefix "nano-" represents a factor of 10^{-9}, which is one-billionth of a unit.

  1. 65.0ºC is equivalent to

  • a. -85.0°F
  • b. 85.0°F
  • c. 120.°F
  • d. 149°F

Explanation: To convert from Celsius to Fahrenheit, use the formula [tex]F = (C \times \frac{9}{5}) + 32[/tex]. Substituting 65 for C: [tex](65 \times \frac{9}{5}) + 32 = 149[/tex]°F.

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