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.
which of the following materials is a conductor?
Glass
Wax
Sodium
Plastic
Correct answer is C
No explanation has been provided for this answer.
The current in a reverse-biased junction is due to?
minority carriers
electrons
majority carriers
holes
Correct answer is A
the current in reverse biased junction diode is due to minority carriers, that is, the negative charges in the p-semi-conductor, and the positive charges in the n-semi-conductor.
200
100
250
150
Correct answer is A
in a transformer, E S/E P = N s/N p
where E s=e.m.f(voltage)of the secondary
E p=e.m.f(voltage)of the primary
N s=no.of turns in the secondary
N p= no. of turns in the primary.
since E s= V s; and E p= V p.
V s/ V p= N s/N p
∴12/240= Ns/4000
Ns =(12x4000)/240
=200
the ray which causes gas molecules to glow is known as
cathode ray
anode ray
molecular ray
gamma ray
Correct answer is A
The ray which causes gas molecules to fluoresce or glow is the cathode rays
The charge carriers in gasses are
ions only
electrons and ions
electrons and holes
electrons only
Correct answer is B
The electrons and cations of ionized gas act as charge carriers.