Question 1
The figure below shows parts of a vernier callipers when the jaws are closed without an object between the jaws.
a) State the error of the vernier callipers
b) A student used the vernier callipers to measure the diameter of a test tube whose actual diameter was 2.13 cm. What was the reading of the vernier callipers
Answer
a) –0.07cm
b) 2.13 + –0.07 = 2.13 – 0.07 = 2.06cm
b) 2.13 + –0.07 = 2.13 – 0.07 = 2.06cm
Question 2
Explain why a hole in a ship near the surface is less dangerous than one near the bottom
Answer
Pressure at the surface is less than at the bottom so water at the surface enters at a lower rate than at the bottom
Question 3
A block measuring 20cm by 10cm by 4cm rests on a flat surface. The block has a weight of 6N. Determine
(i) The minimum pressure it exerts on the surface
(ii) The density of the block in kg/m3
Answer
Question 4
The figure below shows a uniform cardboard in the shape of a parallelogram.
Locate the centre of gravity of the cardboard.
Answer
Question 5
The diagram below shows two cups of tea containing equal volumes of hot tea. The cups have different diameters
State giving reasons, the cup whose tea will cool faster than the other.
Answer
Cup A
- Has a greater surface area of evaporation hence greater rate of heat loss
- Has a greater surface area of evaporation hence greater rate of heat loss