IB Measurements

page 1

 

An atom has a diameter of approximately 10-10 m, and a proton 10-15 m.

1. What is the approximate volume of a proton in meters cubed?

  1. 3 x 10-15
  2. 10-30
  3. 10-45
  4. 10-5
2. What is the approximate ratio between the diameter of an atom like hydrogen to the diameter of the nucleus?
  1. 1010
  2. 105
  3. 103
  4. 101
atom

3. Which of these answers contains only fundamental SI quantities?

  1. Length, time, energy
  2. Length, time, current
  3. temperature, length, energy
  4. time, temperature, energy

4. Which of these answers correctly identifies fundamental SI units and derived units?

Fundamental unit Derived unit
A. ohm pascal
B. kelvin coulomb
C. amp kelvin
D. mole amp

 

5. The watt is a derived unit. In SI fundamental units the watt is equivalent to..

  1. kg m2 s-3
  2. kg m2 s-2
  3. kg m s-3
  4. kg ms-2

6. The ratio between a MJ and a pJ is:

  1. 1012
  2. 1015
  3. 1018
  4. 1021

7. A moment (‘turning force’) has a unit of Nm. Which of these has the same base units as Nm?

  1. joules
  2. watts
  3. kg m s-2
  4. kg m2 s-1
8. A student takes measurements for the acceleration of gravity on Earth, and obtains the following results:

 g = 10.55, 10.57, 10.44, 10.51 ms-2

These results are

  1. precise and accurate
  2. precise but not accurate
  3. accurate but not precise
  4. neither precise nor accurate
9. A student is measuring the length of a set of  pipes. Unfortunately his ruler has been damaged and starts at 0.2cm, which he fails to notice. This damage causes
  1. random and systematic errors
  2. a random error
  3. a systematic error
  4. neither random nor systematic errors