MCQ
Using visible light what is the shortest wavelength which can be measured?


- A200nm
- B100nm
- C350nm
- D175nm

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Charges q, 2q, 3q and 4q are placed at the corners A, B, C and D of a square as shown in the following figure. The direction of electric field at the centre of the square is along

|
(a) AB |
(b) CB |
(c) BD |
(d) AC |
The magnetic induction in air at a point 1cm away from a long wire that carries a current of 1A, will be
|
(a) |
(b) 2 |
(c) 3 |
(d) 4 |
The activity of a sample of a radioactive material is A, at time
and
at time
. If its mean life T, then
|
(a) |
(d) |
(c) |
(d) |
A symmetric double convex lens is cut in two equal parts by a plane containing the principal axis. If the power of the original lens was 4D, the power of a divided lens will be: