The graph which represents the correct variation of logarithm of activity (log A) versus time, in figure is

|
(a) A |
(b) B |
(c) C |
(d) D |
The graph which represents the correct variation of logarithm of activity (log A) versus time, in figure is

|
(a) A |
(b) B |
(c) C |
(d) D |
(d) D
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Shown in the figure here is a convergent lens placed inside a cell filled with a liquid. The lens has focal length + 20 cm when in air and its material has refractive index 1.50. If the liquid has refractive index 1.60, the focal length of the system is

|
(a) + 80 cm |
(b) – 80 cm |
(c) – 24 cm |
(d) –100 cm |
The electrochemical equivalent of a metal is 3.3 . The mass of the metal liberated at the cathode when a 3 A current is passed for 2 seconds will be
|
(a) |
(b) 9.39 |
(c) 6.6 |
(d) 1.1 |
The heat generated through 2 ohm and 8 ohm resistances separately, when a condenser of 200 μF capacity charged to 200 V is discharged one by one, will be
|
(a) 4 J and 16 J respectively |
(b) 16 J and 4 J respectively |
|
(c) 4 J and 8 J respectively |
(d) 4 J and 4 J respectively |
The minimum deviation produced by a hollow prism filled with a certain liquid is found to be 30°. The light ray is also found to be refracted at angle of 30°. The refractive index of the liquid is
|
(a) |
(b) |
(c) |
(d) |
In Young's double slit experiment, if one of the slit is closed fully, then in the interference pattern
|
(a) A bright slit will be observed, no interference pattern will exist |
|
(b) The bright fringes will become more bright |
|
(c) The bright fringes will become fainter |
|
(d) None of the above |