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version a 6. how many millilitres are in 0.020l a. 0.20ml b. 2.0ml c. 5…

Question

version a

  1. how many millilitres are in 0.020l

a. 0.20ml
b. 2.0ml
c. 5.0ml
d. 20.ml
e. 200 ml

  1. a pencil is 25 cm. how many meters is it?

a. 0.025 m
b. 0.25 m
c. 2.5 m
d. 25 m
e. none of the above

  1. the si unit for time is:

a. minute
b. hour
c. day
d. second
e. year

  1. the si prefix that corresponds to a factor of 10^1 is

a. kilo-
b. deci-
c. centi-
d. milli-
e. none of the above

  1. how many significant figures are in 2.30 cm.

a. 3
b. 2
c. 1
d. 0
e. none of the above

  1. when rounding 3.045 m to 3 significant figures the answer would be:

a. 3.05 m
b. 3.045 m
c. 3.14 m
d. 3.04 m
e. none of the above

Explanation:

Step1: 單位換算(第6題)

因為\(1L = 1000mL\),所以\(0.020L=0.020\times1000 = 20mL\)。

Step2: 單位換算(第7題)

因為\(1m = 100cm\),所以\(25cm=\frac{25}{100}=0.25m\)。

Step3: SI單位知識(第8題)

時間的SI單位是秒(Second)。

Step4: SI字首知識(第9題)

\(10^{3}\)對應的SI字首是Kilo - 。

Step5: 有效數字判斷(第10題)

\(2.30cm\)中,2、3、0都是有效數字,共3位。

Step6: 有效數字捨入(第11題)

\(3.045m\)保留3位有效數字,看第四位數字5,根據四捨五入,進一位,結果是\(3.05m\)。

Answer:

  1. D. \(20mL\)
  2. B. \(0.25m\)
  3. D. Second
  4. A. Kilo -
  5. A. 3
  6. A. \(3.05m\)