Two electrolytic cells containing 
and 
respectively are connected in series and a current is passed through them until 1 mg of copper is deposited in the first cell. The amount of silver deposited in the second cell during this time is approximately [Atomic weights of copper and silver are respectively 63.57 and 107.88]
|
(a) 1.7 mg |
(b) 3.4 mg |
(c) 5.1 mg |
(d) 6.8 mg |
(b) 3.4 mg
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The equivalent capacitance between A and B is
|
(a) 2 μF |
(b) 3 μF |
(c) 5 μF |
(d) 0.5 μF |
Amount of light entering into the camera depends upon
|
(a) Focal length of the objective lens |
|
(b) Product of focal length and diameter of the objective lens |
|
(c) Distance of the object from camera |
|
(d) Aperture setting of the camera |
The size of an object as perceived by an eye depends primarily on:
In the following arrangement y = 1.0 mm, d = 0.24 mm and D = 1.2 m. The work function of the material of the emitter is 2.2 eV. The stopping potential V needed to stop the photo current will be
|
(a) 0.9 V |
(b) 0.5 V |
(c) 0.4 V |
(d) 0.1 V |
The stopping potential V for photoelectric emission from a metal surface is plotted along Y-axis and frequency n of incident light along X-axis. A straight line is obtained as shown. Planck's constant is given by
|
(a) Slope of the line |
|
(b) Product of slope on the line and charge on the electron |
|
(c) Product of intercept along Y-axis and mass of the electron |
|
(d) Product of Slope and mass of electron |
An electron experiences a force equal to its weight when placed in an electric field. The intensity of the field will be
|
(a) 1.7 |
(b) 5.0 |
(c) 5.5 |
(d) 56 N/C |
