Question 1
A tailor had a cut off tape measure and wanted to measure the length of a piece of cloth. She placed the piece of cloth as shown in figure 1.
A tailor had a cut off tape measure and wanted to measure the length of a piece of cloth. She placed the piece of cloth as shown in figure 1.
Answer
44.5 - 25.5 = 19.0cm
Question 2
Express the area of land of 0.0025km2 in S.I units and in standard form
Answer
0.0025 x 106m2
= 2.5 x 103m2
= 2.5 x 103m2
Question 3
State two factors that affect surface tension
Answer
- Impurities
- Temperature
- Temperature
Question 4
Figure 2 shows an arrangement used to study diffusion of gases
Explain the observation made after inserting the corks attached to cotton wool
Answer
White ring forms nearer end B than A
Ammonia gas diffuses faster than Hydrochloric acid gas
Ammonia gas diffuses faster than Hydrochloric acid gas
Question 5
Rooms that are well ventilated have ventilations close to the ceiling and some close to the Floor. Explain why
Answer
Warm air is less dense and therefore escapes from top while cold air is more dense and comes in at the bottom.