- ✓changing direct
- Bconstant direct
- Calternating current
- DA.C.
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A slit of size 0.15 cm is placed at 2.1 m from a screen. On illuminated it by a light of wavelength 5 × 10–5 cm. The width of central maxima will be
|
(a) 70 mm |
(b) 0.14 mm |
(c) 1.4 mm |
(d) 0.14 cm |
Which of the following is true for photon
|
(a) E = |
(b) E = |
(c) p = |
(d) E = |
A crystal diode is a
|
(a) Non-linear device |
(b) Amplifying device |
(c) Linear device |
(d) Fluctuating device |
A condenser of 2mF capacitance is charged steadily from 0 to 5 Coulomb. Which of the following graphs correctly represents the variation of potential difference across its plates with respect to the charge on the condenser
|
(a)
|
(a)
|
(c)
|
(d)
|
If E is the electric field intensity of an electrostatic field, then the electrostatic energy density is proportional to
|
(a) E |
(b) |
(c) |
(d) |
Specific rotation of sugar solution is 0.01 SI units. 200
of impure sugar solution is taken in a polarimeter tube of length 0.25m and an optical rotation of 0.4rad is observed. The percentage of purity of sugar is the sample is
|
(a) 80% |
(b) 89% |
(c) 11% |
(d) 20% |
