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.
allows current to flow in either direction
is non-linear
offers a high input resistance
allows current to flow only in one direction
Correct answer is D
A rectifier of an alternating current is a device which allows the flow of current only in one direction
10 and 20
12 and 24
20 and 10
24 and 12
Correct answer is C
2311Na + Proton → pqX + alpha particle
Represent;
2311Na + 11P → pqX + 42He
Thus from the above equations, p = 20 and q = 10
a gold nucleus contains protons, neutrons and electrons uniformly distributed in a tiny volume
the gold nucleus is positively charged and is concentrated in a tiny volume
the gold nucleus emitted alpha particles
the gold nucleus is concentrated in a tiny volume and contains alpha particles
Correct answer is B
No explanation has been provided for this answer.
30V
40V
50V
70V
Correct answer is B
At resonance, inductive reactant XL is equal to the capacitive reactance XC
i.e. XL = XC
and XL = VL/IL
and XC = VC/IC
Again since the components are in series, the same current flows in the series arrangment
i.e. IL = IC
at resonance, VL/IL = VC/IC
∴ VL = VC
= 40V
What is the speed of a particle of mass 10-27kg whose wavelength is 10-8m.
[h = 6.63 x 10-34Js]
6.63ms-1
66.30ms-1
663.00ms-1
6630.00ms-1
Correct answer is B
Energy of a particle is given by
E = hf = hV/λ (since V = fxλ)
But in terms of mass M, E = ∆MV2
∴ ∆MV2 = hV/λ
∆MV = h/λ
∴ V = h/λ∆M
V = 6.63 x 10-34/(10-27 x 10-8)
V = 6.63 x 10-34/10-35
V = 6.63 x 10-34+35
V = 6.63 x 10
V = 66.3ms-1