When the modulating frequency is doubled, the modulation index is halved and the modulating voltage remains constant, the modulation system is
|
(a) Amplitude modulation |
(b) Phase modulation |
|
(c) Frequency modulation |
(d) All of the above |
(c) Frequency modulation
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According to Bohr's theory the radius of electron in an orbit described by principal quantum number n and atomic number Z is proportional to
|
(a) |
(b) |
(c) |
(d) |
he half-life of a radioactive substance is 48 hours. How much time will it take to disintegrate to its 
th part
|
(a) 12 h |
(b) 16 h |
(c) 48 h |
(d) 192 h |
To produce magnified erect image of a far object, we will be required along with a convex lens, is
|
(a) Another convex lens |
(b) Concave lens |
(c) A plane mirror |
(d) A concave mirror |
Which of the following atoms has the lowest ionization potential
|
(a) |
(b) |
(c) |
(d) |
The magnitude of i in ampere unit is
|
(a) 0.1 |
(b) 0.3 |
(c) 0.6 |
(d) None of these |
In nuclear fission, the fission reactions proceeds with a projectile. Which of the following suits the best
|
(a) Slow proton |
(b) Fast neutron |
(c) Slow neutron |
(d) None of these |
The equivalent resistance of the following infinite network of resistances is
|
(a) Less than 4 Ω |
(b) 4 Ω |
|
(c) More than 4 Ω but less than 12 Ω |
(d) 12 Ω |
