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.
The energy stored in an inductor of inductance 5mH when a current of 6A flows through it is
9.0 x 10-3J
9.0 x 10-2J
1.4 x 10-2J
1.8 x 10-3J
Correct answer is B
Energy stored in a coil of inductance, L, and carry a current, I is given by
E = 1/2 L I2
= 1/2 x 5 x 10-3 x 6 x 6
= 9.0 x 10-2J
Flourescent tubes produces light by the
excitation of gas molecules
conduction of solar energy
refraction of light by gas molecules
thermal agitation of electron in the tubes
Correct answer is A
No explanation has been provided for this answer.
| The binding energy of helium | 4 | He is |
| 2 |
4.033U
2.017U
0.033U
0.330U
Correct answer is C
The binding energy of a nucleus, is the work done or energy needed to separate completely the nucleons (protons and neutrons) apart. Again, experiment shows that the total mass of all individual nucleons is greater than that of the nucleus, in which they are together. This difference in the mass is the measure of the binding energy of the particular nucleus.
| For helium | 4 | He, |
| 2 |
XL = XC
XL = 1/2XC
XL = 1/XC
XL = 2XC
Correct answer is A
In an R - L - C circuit resonance occurs when the inductive reactance (XL), is equal to the capacitive reactance (XC)
1.e XL = XC
In a reverse biased junction diode, current flows in by
positive holes alone
majority carriers
electron alone
minority carriers
Correct answer is D
In a reverse biased junction diode only a very small current flows in, carried by the minority carriers which are the negative charges in the n-semi conductor