Introduction to Physics - Prefixes of Derived Units

This exercise consist of 6 objective questions.

1.  Which of the following unit conversions is correct?

1. 2.5 m2 = 250 cm2
2. 5.6 m3 = 560 cm2
3. 4500 cm2 = 45 m2
4. 2.5 x 107 cm3 = 25 m3

2.  The dimension of cuboids is 10cm, 20cm and 20cm. The total surface area of  the cuboids is

1. 1600 m2
2. 16 m2
3. 1.6 m2
4. 0.16 m2

3.  The relationship of pressure (P), force (F) and area (A) is given by the equation

P = F/A

     Find the value of pressure when the force = 500N and the area = 10000 cm2.

1. 0.05 N m-2
2. 5 N m-2
3. 500 N m-2
4. 50000 N m-2

4.  Complete the following unit conversion:

12 ms-1 = __________ kmh-1

1. 43.2
2. 4.32
3. 0.012
4. 0.12

5.  A car is moving with speed 1.8km minute-1, what is the speed in m s-1?

1. 30
2. 1800
3. 0.3
4. 180

6.  Convert 4500kJ/hour to Watt (J/s)

1. 1250 W
2. 1.25W
3. 75W
4. 75 000W