Question 1
State the reading shown on the instrument below used to measure length
Record the correct reading of the diameter if the instrument has a zero error of – 0.02cm
Answer
Main scale reading 8.30 cm
Vernier scale reading 0.080 cm
8.30 + 0.080 = 8.38cm
Vernier scale reading 0.080 cm
8.30 + 0.080 = 8.38cm
Question 2
Explain briefly how the temperature in a green house is kept higher than outside. .
Answer
The radiation is able to penetrate through the roof but not out
In the green house there is high concentration of carbon dioxide which acts as an insulator and traps the heat
In the green house there is high concentration of carbon dioxide which acts as an insulator and traps the heat
Question 3
Explain why the weight of a body varies from place to place
Answer
- Due to the rotation of the earth.
- Due to variation of the distance of the body from the earth’s centre.
- Due to variation of the distance of the body from the earth’s centre.
Question 4
State and explain one factor that enhances accuracy in a thermometer
Answer
Constriction: - prevents the mercury from flowing back into the bulb before
the reading is taken.
Question 5
The figure below shows a manometer that is closed at one end. Study it and answer the question that follows
Determine the pressure of the trapped air
Answer
