Physics Measurement Units Quiz

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Questions and Answers

Which quantity is measured in kilograms?

  • Mass (correct)
  • Length
  • Time
  • Temperature

What is the derived SI unit for pressure?

  • Meter (m)
  • Newton (N)
  • Joule (J)
  • Pascal (Pa) (correct)

How is velocity expressed in SI derived units?

  • Mass/Volume
  • Force/Area
  • Length/Time (correct)
  • Mass x Acceleration

Which of the following is the base unit for temperature in the SI system?

<p>Kelvin (K) (A)</p> Signup and view all the answers

What is the SI derived unit for energy?

<p>Joule (J) (D)</p> Signup and view all the answers

Which quantity is measured in m²?

<p>Area (B)</p> Signup and view all the answers

Which of the following represents the unit for electric current?

<p>Ampere (A) (A)</p> Signup and view all the answers

What is the correct expression for density in SI derived units?

<p>Mass/Volume (A)</p> Signup and view all the answers

What is the SI unit for volume?

<p>Liters (L) (A)</p> Signup and view all the answers

What is the equivalent of 1 atmosphere in kilopascals?

<p>101.325 kPa (A)</p> Signup and view all the answers

How is temperature converted from Celsius to Kelvin?

<p>ToK = toC + 273 (C)</p> Signup and view all the answers

Which prefix represents $10^{-3}$ in the metric system?

<p>Milli (m) (B)</p> Signup and view all the answers

In measuring a known standard mass of 100.00 g, a balance shows 78.55 g. What term describes this measurement?

<p>Inaccurate but precise (D)</p> Signup and view all the answers

What does precision in measurements refer to?

<p>Variability of repeated measurements (B)</p> Signup and view all the answers

What is the density of a substance with a mass of 250 g and a volume of 1500 mL?

<p>0.166 g/mL (C)</p> Signup and view all the answers

Which of the following is a non-SI unit for energy?

<p>Calorie (cal) (B)</p> Signup and view all the answers

What is the primary difference between accuracy and precision?

<p>Precision requires more measurements to determine than accuracy. (A)</p> Signup and view all the answers

How many significant figures are in the number 0.00456?

<p>3 (D)</p> Signup and view all the answers

How are trailing zeros treated when determining significant figures?

<p>They are significant only if the number contains a decimal point. (A)</p> Signup and view all the answers

If the number 105.500 is rounded to three significant figures, what is the result?

<p>106 (B)</p> Signup and view all the answers

Which of the following numbers has only two significant figures?

<p>0.097 (D)</p> Signup and view all the answers

According to the significant figures rules, how many significant figures does the number 0.010205 have?

<p>5 (A)</p> Signup and view all the answers

What should you do if you want to round the number 13.25 to one decimal place?

<p>Round it to 13.3 (D)</p> Signup and view all the answers

When rounding the number 14.50 to the nearest whole number, which of the following is correct?

<p>15 (C)</p> Signup and view all the answers

How many significant figures are in the value 0.003840?

<p>4 (D)</p> Signup and view all the answers

What is the rounded value of 3.365 x 10^5 to three significant figures?

<p>3.36 x 10^5 (B)</p> Signup and view all the answers

How many molecules are present in one mole of a substance?

<p>6.022 x 10^23 (C)</p> Signup and view all the answers

What is the molar mass of a substance if its molecular weight is 46.1 amu?

<p>46.1 g/mol (C)</p> Signup and view all the answers

If you have 2.55 moles of Cu, how many grams of Cu do you have based on its molar mass of 63.5 g/mol?

<p>162 g (C)</p> Signup and view all the answers

When calculating the number of moles using the formula n = m / M.wt, what does 'm' represent?

<p>Mass of the substance in grams (A)</p> Signup and view all the answers

What is the significance of the number 6.022 x 10^23 in chemistry?

<p>It is Avogadro's number (C)</p> Signup and view all the answers

Which of the following statements about significant figures is correct?

<p>Numbers with decimal points have significant trailing zeros (B)</p> Signup and view all the answers

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