- APositive to negative plate.
- BNegative to positive plate.
- CBoth a and b.
- DNone.
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12 cells each having same emf are connected in series with some cells wrongly connected. The arrangement is connected in series with an ammeter and two cells which are in series. Current is 3 A when cells and battery aid each other and is 2 A when cells and battery oppose each other. The number of cells wrongly connected is
|
(a) 4 |
(b) 1 |
(c) 3 |
(d) 2 |
Unpolarized light falls on two polarizing sheets placed one on top of the other. What must be the angle between the characteristic directions of the sheets if the intensity of the final transmitted light is one-third the maximum intensity of the first transmitted beam
|
(a) 75° |
(b) 55° |
(c) 35° |
(d) 15° |
Equal potentials are applied on an iron and copper wire of same length. In order to have the same current flow in the two wires, the ratio r (iron)/r (copper) of their radii must be (Given that specific resistance of iron = ohm–m and specific resistance of copper = 1.7
ohm-m)
|
(a) About 1.2 |
(b) About 2.4 |
(c) About 3.6 |
(d) About 4.8 |
If an observer is walking away from the plane mirror with 6m/sec. Then the velocity of the image with respect to observer will be
|
(a) 6 m/sec |
(b) -6 m/sec |
(c) 12 m/sec |
(d) 3 m/sec |