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.
200
0.005
0.5
0.02
Correct answer is B
V = \(\frac{\lambda}{T}\)
: v = 330ms\(^{-1}\)
\(\lambda\) = 1.65m
T = ?
330 = 1.65
T = \(\frac{1.65}{330}\) = 0.005s
Which of the following instruments may be used to measure relative humidity?
Hydrometer
Manometer
Hygrometer
Hypsometer
Correct answer is C
A hygrometer is an instrument that is used to measure water vapor in the atmosphere. This is also commonly referred to as relative humidity in the atmosphere.
9.0kjkg\(^{-1}\)
84.0kjkg\(^{-1}\)
134.0kjkg\(^{-1}\)
168.0kjkg\(^{-1}\)
Correct answer is C
Heat involved (H) = 88,000J, Mass(M)= 0.5kg, specific heat capacity of water(C) = 4200JkgºC,
Specific latent heat of fusion(L) = ?, Temperature change(Δθ) = θ2 - θ1 = (10 - 0)° = 10°
H = MCΔθ + ML
or
H = M(CΔθ + L) -->\(\frac{H}{M}\) = CΔθ + L
: L = \(\frac{H}{M}\) - CΔθ = \(\frac{88,000}{0.5}\) - 4200 \(\times\) 10
L = 176,000 - 42000 = 134,000
L = 134,000 or 134kj/kg
46.0 Nm\(^{-2}\)
75.0 Nm\(^{-2}\)
80.0 Nm\(^{-2}\)
85.3 Nm\(^{-2}\)
Correct answer is B
Using \(\frac{P_{1}}{T_{1}} = \frac{P_{2}}{T_{2}}\)
P\(_{1}\) = 80Nm\(^{2}\)
T\(_{1}\) = 47 + 273 = 320k
T\(_{2}\) = 27 + 273 = 300k
P\(_{2}\)?
\(\therefore\) = P\(_{2}\) = \(\frac{P_{1}T_{2}}{T_{1}}\)
= \(\frac{80 \times 300}{320}\) = 75.Nm\(^{2}\)
Which of the following is not correct about the molecules of a substance in a gaseous state. They?
are in a constant state of motion
have different speeds
have a temperature which is measured by the average kinetic energy
The collision between the gases is perfectly inelastic
Correct answer is D
The collision between the gases is perfectly elastic