The error in measuring the current with a tangent galvanometer is minimum when the deflection is about
|
(a) 0o |
(b) 30o |
(c) 45o |
(d) 60o |
The error in measuring the current with a tangent galvanometer is minimum when the deflection is about
|
(a) 0o |
(b) 30o |
(c) 45o |
(d) 60o |
(c) 45o
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As per this diagram a point charge +q is placed at the origin O. Work done in taking another point charge -Q from the point A [co-ordinates (0, a) ] to another point B [co-ordinates (a, 0)] along the straight path AB is

|
(a) Zero |
(b) |
(c) |
(d) |
The radius of hydrogen atom in its ground state is 5.3
. After collision with an electron it is found to have a radius of 21.2
. What is the principal quantum number n of the final state of the atom
|
(a) n = 4 |
(b) n = 2 |
(c) n = 16 |
(d) n = 3 |
A light wave has a frequency of 4
Hz and a wavelength of 5
meters in a medium. The refractive index of the medium is
|
(a) 1.5 |
(b) 1.33 |
(c) 1.0 |
(d) 0.66 |
Which of the following form(s) a virtual and erect image for all positions of the object
|
(a) Convex lens |
(b) Concave lens |
(c) Convex mirror |
(d) b, c |
The distance of two points on the axis of a magnet from its centre is 10 cm and 20 cm respectively. The ratio of magnetic intensity at these points is 12.5 : 1. The length of the magnet will be
| (a) 5 cm | (b) 25 cm | (c) 10 cm | (d) 20 cm |