In an LR-circuit, time constant is that time in which current grows from zero to the value (where 
is the steady state current)
|
(a) |
(b) |
(c) |
(d) |
(a) 
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A man suffering from myopia can read a book placed at 10 cm distance. For reading the book at a distance of 60 cm with relaxed vision, focal length of the lens required will be
|
(a) 45 cm |
(b) – 20 cm |
(c) – 12 cm |
(d) 30 cm |
A reaction between a proton and 
that produces 
must also liberate
|
(a) |
(b) |
(c) |
(d) |
When a potential difference is applied across the ends of a linear metallic conductor
|
(a) The free electrons are accelerated continuously from the lower potential end to the higher potential end of the conductor |
|
(b) The free electrons are accelerated continuously from the higher potential end to the lower potential end of the conductor |
|
(c) The free electrons acquire a constant drift velocity from the lower potential end to the higher potential end of the conductor |
|
(d) The free electrons are set in motion from their position of rest |
Hydrogen atom emits blue light when it changes from n = 4 energy level to the n = 2 level. Which colour of light would the atom emit when it changes from the n = 5 level to the n = 2 level
|
(a) Red |
(b) Yellow |
(c) Green |
(d) Violet |
Energy stored in electromagnetic oscillations is in the form of
|
(a) Electrical energy |
(b) Magnetic energy |
(c) Both (a) and (b) |
(d) None of these |
