For a given surface the Gauss's law is stated as 
From this we can conclude that
|
(a) E is necessarily zero on the surface |
|
(b) E is perpendicular to the surface at every point |
|
(c) The total flux through the surface is zero |
|
(d) The flux is only going out of the surface |
(c) The total flux through the surface is zero
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The diode shown in the circuit is a silicon diode. The potential difference between the points A and B will be
|
(a) 6 V |
(b) 0.6 V |
(c) 0.7 V |
(d) 0 V |
If m1 and m2 are the refractive indices of the materials of core and cladding of an optical fibre, then the loss of light due to its leakage can be minimised by having
|
(a) m1 > m2 |
(b) m1 < m2 |
(c) m1 = m2 |
(d) None of these |
To demonstrate the phenomenon of interference, we require two sources which emit radiation
|
(a) Of the same frequency and having a define phase relationship |
|
(b) Of nearly the same frequency |
|
(c) Of the same frequency |
|
(d) Of different wavelengths |
The galaxies are moving away from each other. It is explained by
|
(a) White dwarf star |
(b) Red shift |
(c) Neutron star |
(d) None of these |
Half-life of a substance is 10 years. In what time, it becomes 
th part of the initial amount
|
(a) 5 years |
(b) 10 years |
(c) 20 years |
(d) None of these |
Which of the following gates will have an output of 1
|
(a)
(a)
|
(b)
|
(c)
|
(d)
|
