- Aangle of dip
- ✓angle of declination
- Chorizontal component of magnetic field
- Dcriticle angle
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A convex lens of crown glass (n =1.525) will behave as a divergent lens if immersed in
|
(a) Water (n = 1.33) |
(b) In a medium of n = 1.525 |
|
(c) Carbon disulphide n = 1.66 |
(d) It cannot act as a divergent lens |
The half life period of radium is 1600 years. The fraction of a sample of radium that would remain after 6400 years is
|
(a) |
(b) |
(c) |
(d) |
Work of electric motor is
|
(a) To convert ac into dc |
(b) To convert dc into ac |
|
(c) Both (a) and (b) |
(d) To convert ac into mechanical work |
The third line of Balmer series of an ion equivalent to hydrogen atom has wavelength of 108.5 nm. The ground state energy of an electron of this ion will be
|
(a) 3.4 eV |
(b) 13.6 eV |
(c) 54.4 eV |
(d) 122.4 eV |
In which of the following the final image is erect?
electrons reach the anode per second. If the power consumed is 448 milliwatts, then the plate (anode) voltage is
|
(a) 150 V |
(b) 200V |
(c) 14 × 448 V |
(d) 448/14V |