- Amakes geometry easier.
- Bshows minimum deflection.
- Cshow maximum intensity.
- ✓forms a point image of a point object.
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TV waves have a wavelength range of 1-10 meter. Their frequency range in MHz is
| (a) 30-300 | (b) 3-30 | (c) 300-3000 | (d) 3-3000 |
Which of the following has negative temperature coefficient of resistance
|
(a) Copper |
(b) Aluminium |
(c) Iron |
(d) Germanium |
Of the diodes shown in the following diagrams, which one is reverse biased
|
(a)
|
(b)
|
(c)
|
(d)
|
The perpendicular distance between the original path of the incident ray and the convergent ray of light coming out of a glass slab is called:
A fisherman is standing on the bank of a lake. To a fish underwater viewing obliquely the man looks:
There are n similar conductors each of resistance R. The resultant resistance comes out to be x when connected in parallel. If they are connected in series, the resistance comes out to be
|
(a) |
(b) |
(c) x/n |
(d) nx |
Nuclear fission experiments show that the neutrons split the uranium nuclei into two fragments of about same size. This process is accompanied by the emission of several
|
(a) Protons and positrons |
(b) a - particles |
|
(c) Neutrons |
(d) Protons and a-particles |