Physics Questions and Answers
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
0.31 A
3.20 A
3.40 A
5.00 A
Correct answer is A
Efficiency = (power output)/power input x 100%
= 1s VS x 100% 1p
Vp
∴ (80)/100 = (50)/IP x 200
I P = (50 x 100)/80 x 200 = 0.3125 A
The d.c generator has essentially the same components as the a.c generator except the presence of?
slip-ring
carbon brushes
split ring
armature
Correct answer is C
To correct and A.C generator with a D.C generator the slip ring is replaced with split-ring communicator
0.96 kWh
19.2 kWh
9.60 kWh
1.92 kWh
Correct answer is B
Energy consumed = power x time
= (60 W x 10 + 40 W x 5) x 24 h
= (600 W + 200 W ) x 24 h
= 800 W x 24h = 19200 w h
= 19.2 kWh
11:1
1:11
12:11
11:12
Correct answer is A
Power supplied = I\(^2\) R = 20\(^2\) X 1 = 400 W
Power dissipated = IV = 20 X 220 = 4400 W
(Power supplied)/Power dissipated = 4400 W / 400 W
= 11 / 1 or 11 : 1
A short chain is sometimes attached to the back of a petrol tanker to?
generate more friction
ensure the balancing of the tanker
caution the driver when overspeeding
conduct excess charges to the earth
Correct answer is D
The friction between the tanker and air creates charges which the chain conducts to the ground.