While doing his experiment, Millikan one day observed the following charges on a single drop
(i) 6.563 
(ii) 8.204 
(iii) 11.50 (iv) 13.13 
(v) 16.48 (vi) 18.09
From this data the value of the elementary charge (e) was found to be
|
(a) 1.641 |
(b) 1.630 |
(c) 1.648 |
(d) 1.602 |
(a) 1.641
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The resistance 
of a conductor varies with temperature t as shown in the figure. If the variation is represented by = 
, then
|
(a) α and β are both negative |
(b) α and β are both positive |
|
(c) α is positive and β is negative |
(d) α is negative and β are positive |
The magnetic moment of a magnet of length 10 cm and pole strength 4.0 Am will be
|
(a) |
(b) 1.6 |
(c) 20 |
(d) 8.0 |
A convex lens of focal length f is placed somewhere in between an object and a screen. The distance between the object and the screen is x. If the numerical value of the magnification produced by the lens is m, then the focal length of the lens is
|
(a) |
(b) |
(c) |
(d) |
In a crystal, the atoms are located at the position of
|
(a) Maximum potential energy |
(b) Minimum potential energy |
|
(c) Zero potential energy |
(d) Infinite potential energy |
Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?
A particle moving in a magnetic field increases its velocity, then its radius of the circle
|
(a) Decreases |
(b) Increases |
(c) Remains the same |
(d) Becomes half |
