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 particle and wave nature of matter are demonstrated in the equation
λ = hc/E
λ = h/P
λ = c/f
λ = 2 d sin θ
Correct answer is B
I wave - particle duality of matter, the momentum of sub-atomic particle is given by P = h/λ where h = planck constant ; λ = wave length
=> λ = h/P
33.0
0.1
90.0
10.0
Correct answer is D
Sensitivity of a measuring instrument is given by deflection per unit current: and given that deflection = 30o; and current (I) = 3A: then the sensitivity of the meter = 30/0 = 10.0
X rays can be used in the study of crystal structure because they
have a very long-reaching wavelength
have extremely short wavelength
are invisible
are very fast
Correct answer is B
No explanation has been provided for this answer.
For semi conductor to have negative temperature coefficient of resistance implies that
their resistance decrease with temperature
The resistance increase with temperature
their resistance is constantly changing with temperature
they have electrons and holes at high temperature
Correct answer is A
Temperature coefficient of resistance is given by
α = | Increase in resistance per oC rise in temp. |
__resistance at 0oC |
1.4A
1.2A
12.0A
14.0A
Correct answer is B
Current (I) in the circuit = V/Z
But z =
√ R2 + (XL - XC)2
=
√ 82 + (16 – 10) 2
=
√ 64 + 36
=
√ 100 = 10Ω
∴ Current (I) = V/Z = 12/10 = 1.2 A