Q. In a thin film of oil on water, which color will appear at the topmost layer if the film thickness is such that it causes constructive interference for blue light?
A.Red
B.Green
C.Blue
D.Yellow
Solution
If the film thickness causes constructive interference for blue light, blue will be the color that appears at the topmost layer.
Q. In a thin film of oil on water, which color will appear at the topmost layer if the thickness of the film is such that it causes constructive interference for blue light?
A.Red
B.Green
C.Blue
D.Yellow
Solution
If the film thickness causes constructive interference for blue light, blue will be the color that appears most prominently.
Q. In a thin film of oil on water, which color will appear at the topmost layer when viewed from above?
A.Red
B.Blue
C.Green
D.Yellow
Solution
The color that appears depends on the thickness of the film and the wavelength of light. Typically, red light is least affected by thin film interference.
Q. In a thin film of oil on water, which color will be most prominently visible due to constructive interference?
A.Red
B.Blue
C.Green
D.Yellow
Solution
The color that is most prominently visible depends on the thickness of the film and the wavelength of light. Typically, shorter wavelengths like blue are enhanced due to constructive interference.
Q. In a thin film of soap, why do we see different colors?
A.Different wavelengths interfere constructively at different angles
B.Different wavelengths are absorbed
C.Different wavelengths reflect differently
D.Different wavelengths travel at different speeds
Solution
Different colors are seen because different wavelengths of light interfere constructively at different angles due to the varying thickness of the soap film.
Correct Answer: A — Different wavelengths interfere constructively at different angles
Q. In a total internal reflection scenario, if the angle of incidence is 45° and the refractive index of the medium is 1.5, what is the angle of refraction?
A.45°
B.30°
C.60°
D.Total internal reflection occurs
Solution
Since the angle of incidence (45°) is less than the critical angle (approximately 41.8° for glass to air), total internal reflection does not occur, and the angle of refraction cannot be calculated.
Correct Answer: D — Total internal reflection occurs
Q. In a transformer, if the primary coil has 100 turns and the secondary coil has 200 turns, what is the relationship between primary and secondary voltages?
A.Vp/Vs = 1/2
B.Vp/Vs = 2
C.Vp/Vs = 1
D.Vp/Vs = 2/1
Solution
The voltage ratio in a transformer is given by Vp/Vs = Np/Ns, so Vp/Vs = 100/200 = 1/2, hence Vs = 2Vp.
Q. In a transformer, if the primary coil has 100 turns and the secondary coil has 200 turns, what is the relationship between the primary and secondary voltages?
A.V_primary = V_secondary
B.V_primary < V_secondary
C.V_primary > V_secondary
D.V_primary = 2 * V_secondary
Solution
In a transformer, the voltage ratio is directly proportional to the turns ratio. Therefore, if the secondary coil has more turns, the secondary voltage will be greater than the primary voltage.
Q. In a transformer, if the primary coil has 100 turns and the secondary coil has 50 turns, what is the relationship between the primary voltage (Vp) and the secondary voltage (Vs)?
A.Vp = Vs
B.Vp = 2Vs
C.Vs = 2Vp
D.Vp = 0.5Vs
Solution
The voltage ratio in a transformer is given by the turns ratio: Vp/Vs = Np/Ns. Here, Vp = 2Vs.
Q. In a transformer, if the primary coil has 100 turns and the secondary coil has 50 turns, what is the relationship between the primary and secondary voltages?
A.V1/V2 = 2
B.V1/V2 = 0.5
C.V1/V2 = 1
D.V1/V2 = 4
Solution
The voltage ratio in a transformer is equal to the turns ratio: V1/V2 = N1/N2. Here, V1/V2 = 100/50 = 2.
Q. In a transformer, if the primary coil has 200 turns and the secondary coil has 50 turns, what is the relationship between the primary and secondary voltages?
A.Vp/Vs = 4
B.Vp/Vs = 0.25
C.Vp/Vs = 2
D.Vp/Vs = 1
Solution
The voltage ratio in a transformer is inversely proportional to the turns ratio: Vp/Vs = Np/Ns = 200/50 = 4.