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IB Measurements

 

page 1

1. What is the approximate size in meters of a subatomic particle like a proton?

A. 10-12
B. 10-15
C. 10-18
D. 10-21

2. What is the approximate mass of the universe?

A. 1020 kg
B. 1030 kg
C. 1040 kg
D. 1050 kg

3. What is the age of the universe in seconds?

A. 1012
B. 1015
C. 1018
D. 1021

4. What is the ratio between the size of an atom like hydrogen to the size of the nucleus?

A. 107
B. 105
C. 103
D. 101

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

A. Length, time, energy
B. Length, time, current
C. temperature, length, energy
D. time, temperature, energy

6. 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

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

A. kg m2 s-3
B. kg m2 s-2
C. kg m s-3
D. kg ms-2

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

A. 1012
B. 1015
C. 1018
D. 1021
9. A moment (‘turning force’)has a unit of Nm. Which of these has the same base units as Nm?

A. joules
B. watt seconds
C. kg m s-2
D. kg m2 s-1
10. 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

11.  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

A. random and systematic errors
B. a random error
C. a systematic error
D. Neither random nor systematic errors

12. Two techniques used by scientists to try to reduce errors are plotting straight line graphs and taking averages of repeat readings. Which type of error do these reduce?

Straight line graphs
Repeat readings
A.
systematic
random
B.
random
systematic
C.
systematic
systematic
D.
random
random

 

To find the speed of an athelete a student obtains these results:
            Distance =25m, time taken = 3.22 s

13.  The final velocity should be written as..

A. 7.7640 ms-1
B. 7.764 ms-1
C. 7.76 ms-1
D. 7.8 ms-1

14. The error in the distance reading was stated as 3%. The error in the time reading was stated as 2%.
The final error in the answer should be stated as

A. 2%
B. 3% 
C. 5% 
D. 6%

15. A student is calculating the kinetic energy of a toy car and obtains these readings:

  m = 0.20  ±  0.01kg      v= 5.0 ± 0.5 ms-1

The percentage errors for each quantity are:

 

Mass  error

Velocity  error

Kinetic energy  error

A.

4%

5%

9%

B.

5%

10%

15%

C.

4%

10%

14%

D.

5%

10%

25%