A light has amplitude A and angle between analyser and polariser is 60°. Light is reflected by analyser has amplitude
|
(a) A |
(b) A/ |
(c) |
(d) A/2 |
(d) A/2
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An external resistance R is connected to a battery of e.m.f. V and internal resistance r. The joule heat produced in resistor R is maximum when R is equal to
|
(a) r |
(b) |
(c) 2r |
(d) Infinitely large |
One metre length of wire carries a constant current. The wire is bent to form a circular loop. The magnetic field at the centre of this loop is B. The same is now bent to form a circular loop of smaller radius to have four turns in the loop. The magnetic field at the centre of this new loop is
|
(a) 4 B |
(b) 16 B |
(c) B/2 |
(d) B/4 |
Which of the following is not an application of eddy currents
|
(a) Induction furnace |
(b) Galvanometer damping |
|
(c) Speedometer of automobiles |
(d) X-ray crystallography |
If in a nuclear fusion process the masses of the fusing nuclei be 
and 
and the mass of the resultant nucleus be 
, then
(a) 
|
(b) 
|
(c) 
|
(d) 
|
The hyper-metropia is a
|
(a) Short-side defect |
(b) Long- side defect |
|
(c) Bad vision due to old age |
(d) None of these |
