- A49:4
- ✓4:49
- C3:7
- DNone of these
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How many NAND gates are used to form an AND gate
|
(a) 1 |
(b) 2 |
(c) 3 |
(d) 4 |
The number of neutrons released when
undergoes fission by absorbing
and (
are formed, is
|
(a) 0 |
(b) 1 |
(c) 2 |
(d) 3 |
Due to the earth's magnetic field, charged cosmic ray particles
| (a) Require greater kinetic energy to reach the equator than the poles |
|
(b) Require less kinetic energy to reach the equator than the poles |
| (c) Can never reach the equator |
| (d) Can never reach the poles |
A convex lens of focal length 0.5 m and concave lens of focal length 1 m are combined. The power of the resulting lens will be
|
(a) 1 D |
(b) – 1 D |
(c) 0.5 D |
(d) – 0.5 D |
If m is mass of electron, v its velocity, r the radius of stationary circular orbit around a nucleus with charge Ze, then from Bohr's first postulate, the kinetic energy K =
of the electron in C.G.S. system is equal to
|
(a) |
(b) |
(c) |
(d) |
Photons of energy 6 eV are incident on a metal surface whose work function is 4 eV. The minimum kinetic energy of the emitted photo-electrons will be
|
(a) 0 eV |
(b) 1 eV |
(c) 2 eV |
(d) 10 eV |