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.
high velocity electrons are abruptly stopped in metals
energy changes occur within the nucleus of atoms
energy changes occur within the electronic structure of atoms
electrons are deflected in very strong magnetic fields
Correct answer is B
Gamma rays are electromagnetic radiation of nuclear origin; they are produced from energy changes which occur within the nucleus of ato
The core of an efficient transformer should consist of laminated pieces of metal in order to
increase the heat produced by increasing the eddy current
increase the heat produced by reducing the eddy current
reduce the heat produced by increasing the eddy current
reduce the heat produced by reducing the eddy current
Correct answer is D
No explanation has been provided for this answer.
At what frequency would a 10H inductor have a reactance of 2000Ω?
π/200Hz
π/100Hz
100/πHz
100πHz
Correct answer is E
Inductive reactance XL = 2πfL
∴ 2πfL = 2000Ω
then f = 2000Ω/2 x π x 10
f = 100/πHz
motion, the field and the induced current
induced current, the motion and the field
field, the induced current and the motion
induced current, the field and the motion
Correct answer is A
No explanation has been provided for this answer.
2mA
10mA
20mA
25mA
Correct answer is C
Shunt resistance is usually given as
R = igrg/(I - ig)
Where R = 0.05Ω
rg = 5Ω
I = 2M
∴ ig = IR/(rg + R)
= (2 x 0.05)/(5 + 0.05)
= 0.10/5.05
= 0.0198A
= 19.8mA
= 20mA