Question 1
A mass of 7.5 kg has weight of 30N on a certain planet. Calculate the acceleration due to gravity on this planet
Answer
Question 2
The diagram below shows the scale of the vernier callipers. If the vernier calliper has a zero error of + 0.03 cm. Determine the correct reading
Answer
Question 3
Explain the cause of random motion of smoke particles as observed in Brownian motion experiment using a smoke cell.
Answer
Smoke particles are being hit by unseen air molecules moving in a random motion
Question 4
When a Bunsen burner is lit below a wire gauze, it is noted that the flame initially burns below the gauze as shown in the figure below. After sometime the flame burns below as well as above the gauze
Explain this observation
Answer
Wire gauze is a good conductor of heat and hence conduct heat away from the upper region of the wire gauze. when the gas reaches its ignition temperature later the flame starts showing on the upper region.
Question 5
A small chain is often seen hanging at the back of a petrol carrying lorry. State and explain its significance.
Answer
Friction generates charges on the lorry the chain discharges the lorry to prevent sparks which may lead to explosion.