MCQ
The value of $\frac{1}{4\pi\in_{0}}$
- ✓$9\times10^{9}Nm^{2}C^{-2}$
- B$9\times10^{-9}Nm^{2}C^{-2}$
- C$9\times10^{12}Nm^{2}C^{-2}$
- D$9\times10^{-12}Nm^{2}C^{-2}$
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To obtain P-type Si semiconductor, we need to dope pure Si with
|
(a) Aluminium |
(b) Phosphorous |
(c) Oxygen |
(d) Germanium |
The radius of curvature of convex surface of a thin plano-convex lens is 15 cm and refractive index of its material is 1.6. The power of the lens will be
|
(a) + 1D |
(b) -2D |
(c) +3D |
(d) +4D |
Two identical light sources S1 and S2 emit light of same wavelength l. These light rays will exhibit interference if
|
(a) Their phase differences remain constant |
|
(b) Their phases are distributed randomly |
|
(c) Their light intensities remain constant |
|
(d) Their light intensities change randomly |
Two resistances are connected in two gaps of a metre bridge. The balance point is 20 cm from the zero end. A resistance of 15 ohms is connected in series with the smaller of the two. The null point shifts to 40 cm. The value of the smaller resistance in ohms is
|
(a) 3 |
(b) 6 |
(c) 9 |
(d) 12 |