MCQ
The angle between magnetic meridian and geographical meridian is called :
- Aangle of dip
- ✓angle of declination
- Chorizontal component of magnetic field
- Dcriticle angle
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What is increased in step-down transformer
|
(a) Voltage |
(b) Current |
(c) Power |
(d) Current density |
The radius of curvature of the curved surface of a plano-convex lens is 20cm. If the refractive index of the material of the lens be 1.5, it will.
If threshold wavelength for sodium is 6800Å then the work function will be
|
(a) 1.8 eV |
(b) 2.5 eV |
(c) 2.1 eV |
(d) 1.4 eV |
The work function for tungsten and sodium are 4.5 eV and 2.3 eV respectively. If the threshold wavelength λ for sodium is
, the value of λ for tungsten is
|
(a) 5893 Å |
(b) 10683 Å |
(c) 2791 Å |
(d) 528 Å |