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.
0.25Ω
2.50Ω
25.00Ω
250.00Ω
Correct answer is C
No explanation has been provided for this answer.
48.0°C
38.0°C
28.3°C
23.0°C
Correct answer is C
GIVEN DATA:
where ΔL is the increase in length = 0.01
L1 is the initial length = 100
T1 = 20
T2 = ?
α is the linear expansivity of iron = 1.2 x 10−5°C
Formula
ΔL = L1αΔT
ΔT = \frac{ΔL}{L1α}
ΔT is the change in temperature = T2 - T1
T2 = \frac{ΔL}{L1α} + T1
T2 = \frac{0.01}{100 \times 1.2 x 10^{-5}} + 20
T2 = 8.3 + 20
T2 = 28.3
300N
600N
800N
800N
Correct answer is D
No explanation has been provided for this answer.
[Refractive index of glass =1.5; refractive index of ethyl alcohol = 1.36]
27^o
33.5^o
51.7^o
72.8^o
Correct answer is B
The angle of incidence l = 30º
The angle of refraction , r =?
The refractive index of glass ng = 1.5
The refractive index of ethyl alcohol, ne = 1.36
from snell's law :
\frac{n_e}{n_g} = \frac{sini}{sinr}
\frac{1.36}{1.5} = \frac{sin30º}{sinr}
1.36sinr = 1.5 x sin30º
sinr = \frac{1.5 \times sin30º}{1.36}
sinr = 0.5515
r = sin^{-1}(0.5515)
r = 33.5º
A
B
C
D
Correct answer is C
No explanation has been provided for this answer.