In an electrolyte 3.2 
bivalent positive ions drift to the right per second while 3.6 monovalent negative ions drift to the left per second. Then the current is
|
(a) 1.6 amp to the left |
(b) 1.6 amp to the right |
(c) 0.45 amp to the right |
(d) 0.45 amp to the left |
(b) 1.6 amp to the right
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Two slits are separated by a distance of 0.5 mm and illuminated with light of λ = 6000 Å. If the screen is placed 2.5 m from the slits. The distance of the third bright image from the centre will be
|
(a) 1.5 mm |
(b) 3 mm |
(c) 6 mm |
(d) 9 mm |
The power of two convex lenses A and B are 8 diopters and 4 diopters respectively. If they are to be used as a simple microscope, the magnification of
|
(a) B will be greater than A |
(b) A will be greater than B |
|
(c) The information is incomplete |
(d) None of the above |
In Wheatstone's bridge P = 9 ohm, Q = 11 ohm, R = 4 ohm and S = 6 ohm. How much resistance must be put in parallel to the resistance S to balance the bridge
|
(a) 24 ohm |
(b) |
(c) 26.4 ohm |
(d) 18.7 ohm |
A thin spherical conducting shell of radius R has a charge q. Another charge Q is placed at the centre of the shell. The electrostatic potential at a point p a distance 
from the centre of the shell is
|
(a) |
(b) |
(c) |
(d) |
Conditions of diffraction is
|
(a) |
(b) |
(c) |
(d) None of these |
Which of the following statements are true regarding radioactivity
(I) All radioactive elements decay exponentially with time
(II) Half life time of a radioactive element is time required for one half of the radioactive atoms to disintegrate
(III) Age of earth can be determined with the help of radioactive dating
(IV) Half life time of a radioactive element is 50% of its average life period
Select correct answer using the codes given below
Codes :
|
(a) I and II |
(b) I, III and IV |
(c) I, II and III |
(d) II and III |
A parallel plate condenser is connected with the terminals of a battery. The distance between the plates is 6mm. If a glass plate (dielectric constant K = 9) of 4.5 mm is introduced between them, then the capacity will become
|
(a) 2 times |
(b) The same |
(c) 3 times |
(d) 4 times |
