Light and Sound Practice Questions
NECO (Nigeria) · NECO Physics · 137 free MCQs with instant results and detailed explanations.
137
Total
42
Easy
79
Medium
16
Hard
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Sample Questions from Light and Sound
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Q1
Easy
What is the speed of light in a vacuum?
A.
3.0 x 10^8 m/s
B.
1.5 x 10^8 m/s
C.
3.0 x 10^6 m/s
D.
1.0 x 10^8 m/s
Show Answer & Explanation
Correct Answer: A
The speed of light in a vacuum is approximately 3.0 x 10^8 m/s, which is a fundamental constant in physics.
Q2
Easy
What type of wave is sound considered to be?
A.
Transverse wave
B.
Longitudinal wave
C.
Electromagnetic wave
D.
Surface wave
Show Answer & Explanation
Correct Answer: B
Sound is a longitudinal wave, meaning that the particle displacement is in the same direction as the wave propagation.
Q3
Easy
Which of the following phenomena describes the bending of light when it passes from one medium to another?
A.
Reflection
B.
Diffraction
C.
Refraction
D.
Dispersion
Show Answer & Explanation
Correct Answer: C
Refraction is the phenomenon where light changes its direction when it passes from one medium to another due to a change in speed.
Q4
Medium
What is the wavelength of light if its frequency is 6 x 10^14 Hz? (Use the speed of light c = 3 x 10^8 m/s)
A.
5 x 10^-7 m
B.
3 x 10^-6 m
C.
1.8 x 10^-6 m
D.
2 x 10^-7 m
Show Answer & Explanation
Correct Answer: A
The wavelength (ฮป) can be calculated using the formula ฮป = c/f. Substituting c = 3 x 10^8 m/s and f = 6 x 10^14 Hz gives ฮป = 3 x 10^8 / 6 x 10^14 = 5 x 10^-7 m.
Q5
Medium
Which of the following phenomena occurs when light passes from air into water?
A.
Reflection
B.
Refraction
C.
Diffraction
D.
Dispersion
Show Answer & Explanation
Correct Answer: B
Refraction is the bending of light as it passes from one medium to another with different densities, such as from air to water.
Q6
Medium
A sound wave travels at a speed of 340 m/s. What is the time taken for the sound to travel a distance of 1020 m?
A.
2.5 s
B.
3 s
C.
4 s
D.
5 s
Show Answer & Explanation
Correct Answer: B
Time taken can be calculated using the formula time = distance/speed. Here, time = 1020 m / 340 m/s = 3 seconds.
Q7
Medium
When a light ray hits a surface at an angle of incidence of 30 degrees, what is the angle of reflection?
A.
30 degrees
B.
60 degrees
C.
45 degrees
D.
90 degrees
Show Answer & Explanation
Correct Answer: A
According to the law of reflection, the angle of incidence is equal to the angle of reflection. Therefore, if the angle of incidence is 30 degrees, the angle of reflection is also 30 degrees.
Q8
Hard
A light ray enters a glass block from air at an angle of incidence of 30 degrees. If the refractive index of glass is 1.5, what is the angle of refraction?
A.
18.4 degrees
B.
20 degrees
C.
22 degrees
D.
25 degrees
Show Answer & Explanation
Correct Answer: A
Using Snell's Law, n1 * sin(ฮธ1) = n2 * sin(ฮธ2), we can calculate the angle of refraction. Here, n1 = 1 (air), n2 = 1.5 (glass), and ฮธ1 = 30 degrees. Solving gives sin(ฮธ2) = 1/sin(30) = 1.5*sin(30) = 0.75, which corresponds to ฮธ2 = 18.4 degrees.
Q9
Hard
A light beam passes from air into water at an angle of 30 degrees. If the refractive index of water is 1.33, what is the angle of refraction in the water?
A.
22.1 degrees
B.
30 degrees
C.
41.8 degrees
D.
45 degrees
Show Answer & Explanation
Correct Answer: A
Using Snell's Law, n1 * sin(ฮธ1) = n2 * sin(ฮธ2), where n1 is the refractive index of air (approximately 1), ฮธ1 is 30 degrees, n2 is 1.33, and ฮธ2 is what we need to find, we calculate that sin(ฮธ2) = sin(30) / 1.33. Solving gives ฮธ2 โ 22.1 degrees.
Q10
Hard
A sound wave travels through a medium at a speed of 340 m/s. If the frequency of the sound is 170 Hz, what is the wavelength of the sound wave?
A.
2 meters
B.
1.5 meters
C.
0.5 meters
D.
1 meter
Show Answer & Explanation
Correct Answer: A
The wavelength (ฮป) can be calculated using the formula: ฮป = v/f, where v is the speed of sound (340 m/s) and f is the frequency (170 Hz). Thus, ฮป = 340 / 170 = 2 meters.
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Light and Sound โ NECO (Nigeria) NECO Physics Practice Questions Online
This page contains 137 practice MCQs for the chapter Light and Sound in NECO (Nigeria) NECO Physics. The questions are organized by difficulty โ 42 easy, 79 medium, 16 hard โ so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.