Question 1
Figure 1 below shows a scale of vernier calipers when measuring the width of a meter rule.
What is the actual width of the meter rule if the calipers has a zero error of + 0.6mm.?
Answer
MSR= 6.90cm
VSR = 0.04cm
= (6.90 + 0.04) cm
Actual width = 6.94cm - 0.06
= 6.58cm
VSR = 0.04cm
= (6.90 + 0.04) cm
Actual width = 6.94cm - 0.06
= 6.58cm
Question 2
A clinical thermometer has a constriction in the bore just above the bulb. State the use of the constriction.
Answer
It prevents the return of the mercury to the bulb when the thermometer is removed from the body to the surrounding
Question 3
Figure 2 below shows air trapped by a column of t6he mercury in a U-tube . The atmospheric pressure is 76 cm Hg.
At what pressure in mmHg is the enclosed air?
Answer
Pressure = Press. Due to atm. + press. due to liquid column
= (76 + 50) cmHg
= 126cmHg OR 1260mmHg
= (76 + 50) cmHg
= 126cmHg OR 1260mmHg
Question 4
A girl of mass 50 Kg runs up a flight of height 4m in 4 seconds . Calculate the power she developed in this time
Answer
Power = work done ⁄ Time = mgh ⁄ Time
Power = (50 x 10 x 4) ⁄ 4
Power = 500W
Power = (50 x 10 x 4) ⁄ 4
Power = 500W
Question 5
Name the transducer in the following energy conversions.
i) Kinetic to electrical
ii) Solar to heat
Answer
i) Dynamo
ii) Solar panel
ii) Solar panel