MCQ
A pencil dipped partially in water appears bent because of:
- AReflection at water surface
- BDiffraction at water surface
- CRefraction at water surface
- DWater is flowing
✓
Answer
- Refraction at water surface
Explanation:
Refraction is a phenomenon in which a light ray incident on a surface separating two transparent media bends at the change of medium.
Snell's law gives the relation between angle of incidence and refraction and the Refractive index of the respective medium.
$\mu_1$sin(i) = $\mu_2$sin(r)
where, i, r are the angles of incidence and refraction respectively.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
In the white light of sun, maximum scattering by the air molecules present in the earth's atmosphere is for:
If the current is doubled, the deflection is also doubled in
|
(a) A tangent galvanometer |
(b) A moving coil galvanometer |
|
(c) Both (a) and (b) |
(d) None of these |
For the sustained interference of light, the necessary condition is that the two sources should
|
(a) Have constant phase difference |
(b) Be narrow |
|
(c) Be close to each other |
(d) Of same amplitude |
If the frequency of light in a photoelectric experiment is doubled, the stopping potential will:
- Be doubled.
- Be halved.
- Become more than double.
- Become less than double.
Value of refractive index for any medium is:
Light with an energy flux of 20W/cm2 falls on a non-reflecting surface at normal incidence. If the surface has an area of 30cm2. the total momentum delivered (for complete absorption) during 30 minutes is:
An electron oscillating with a frequency of 3 × 106 Hz, would generate:
Which of the following statements is not true
|
(a) The resistance of intrinsic semiconductors decrease with increase of temperature |
|
(b) Doping pure Si with trivalent impurities give P-type semiconductors |
|
(c) The majority carriers in N-type semiconductors are holes |
|
(d) A PN-junction can act as a semiconductor diode |
Magnetic field intensity at the centre of coil of 50 turns, radius 0.5 m and carrying a current of 2 A is
|
(a) 0.5 |
(b) 1.25 |
(c) 3 |
(d) 4 |
Electric conduction in a semiconductor takes place due to:
- Electrons only.
- Holes only.
- Both electrons and holes.
- Neither electrons nor holes.