- A1
- B1.5
- ✓2.42
- D4.14
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The colour of the second line of Balmer series is
| (a) Blue | (b) Yellow |
(c) Red |
(d) Violet |
A conducting ring of radius 1 meter is placed in an uniform magnetic field B of 0.01Telsa oscillating with frequency 100Hz with its plane at right angles to B. What will be the induced electric field
|
(a) π volt/m |
(b) 2 volt/m |
(c) 10 volt/m |
(d) 62 volt/m |
The angle of incidence at which reflected light is totally polarized for reflection from air to glass (refraction index n) is
|
(a) |
(b) |
(c) |
(d) |
The sun emits a light with maximum wavelength 510 mm while another star X emits a light with maximum wavelength of 350 nm. What is the ratio of surface temperature of sun and the star X
|
(a) 2.1 |
(b) 0.68 |
(c) 0.46 |
(d) 1.45 |
An ellipsometer is an instrument for.
The true statement for thermo e.m.f. of a thermocouple
|
(a) Depends on the nature of metals |
|
(b) Depends only on temperature of cold junction |
|
(c) Depends only on temperature of hot junction |
|
(d) Depends on the length of the wires used for thermocouple |