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.
216000J
13200J
3600J
864J
220J
Correct answer is A
E = pt
=> 60 x 1 x 60 x 60 = 216000J
64 minutes
32 minutes
8 minutes
2 minutes
1 minute
Correct answer is E
D ∝ l2
E will increase 4 times when current is doubled.
Therefore time will decrease by a factor of 4, which is 1 minute.
Each of teh conductors will experience a force
Each of the conductors can move
The forces on the conductors will be equal
There are concentric lines of force around each conductor
The two conductors will repel each other
Correct answer is E
No explanation has been provided for this answer.
0.2Ω
0.4Ω
1.0Ω
3.0Ω
9.0Ω
Correct answer is C
Assume the internal resistor = R
Current with 2 Ohm Resistor = 0.80A
Voltage = (R + 2) x 0.80 = V ; That is 0.8R + 1.6 = V ———————[[1]
Current with 3 Ohm Resistor = 0.40 A
Voltage = (R+3) x 0.40 = V ; That is 0.4R + 1.2 = V ————————[[2]
Subtracting 1 from 2 gives
--> (0.8 - 0.4) R
( 1.6 - 1.2 )
( V - V )
Therefore
0.4R + 0.4 = 0
R = 0.4 /0.4 = 1 Ohms
Local action is normally prevented from taking place in a simple electric cell by
introducing an oxidising agent into the acid
not drawing current continuously for long periods
amalgamating the surface of the zinc plate
using a porous pot to isolate the zinc plate from the acid
using dilute sulphuric acid
Correct answer is C
No explanation has been provided for this answer.