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.
12.0144 cm\(^3\)
12.0346 cm\(^3\)
12.0288 cm\(^3\)
12.0173 cm\(^3\)
Correct answer is C
Linear expansivity (\(\alpha\))
= \(\frac{A_2 - A_1}{A_1\theta}\)
Original Area(A\(_1\)) = 4 x 3 = 12
New Area (A\(_2\)) = ?
Temp. rise (\(\theta\)) = 100\(^o\)C
A\(_2\) - 12 = 1200 x 2 x 1.2 x 10\(^{-5}\)
A\(_2\) - 12 = 2880 x 10\(^-5\)
A\(_2\) - 12 = 0.0288
A\(_2\) = 12.0288 cm\(^2\)
48.6°
19.5°
20.0
45.0
Correct answer is A
Given that refractive index = 1.5, angle of incidence = 30°, angle of refraction =?
using snell's law = refractive index = \(\frac{sini}{sinr}\)
=\(\frac{1}{n } = \frac{sin30}{sinr}\)
= \(sinr = 1.5\times sin 30\)
r = \(sin^10.75\)
= 48.6°
this is because ray is traveling from a more denser medium to a less dense medium
The anomalous expansion of water occurs in the range
0 °C to 100 °C
0 °C to 4 °C
4 °C to 100 C
-4 °C to 0 °C
Correct answer is B
No explanation has been provided for this answer.
Which property of a wave remains constant when the wave travels from one medium into another?
Amplitude
Wavelength
Velocity
Frequency
Correct answer is D
Frequency remains unchanged as waves travel from one medium to another because it is characterized by the source of the wave.
A device consumes 100 W of power when connected to a 120 V source. Calculate its resistance
1.2\(\Omega\)
12,000 \(\Omega\)
20.0\(\Omega\)
144\(\Omega\)
Correct answer is D
P = \(\frac{V^2}{R}\)
R = \(\frac{120^2}{100}\)
= 144.0\(\Omega\)