Electric lines of force about negative point charge are
|
(a) Circular, anticlockwise |
(b) Circular, clockwise |
|
(c) Radial, inward |
(d) Radial, outward |
(c) Radial, inward
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An unknown resistance R1 is connected in series with a resistance of 10 W. This combinations is connected to one gap of a metre bridge while a resistance R2 is connected in the other gap. The balance point is at 50 cm. Now, when the 10 W resistance is removed the balance point shifts to 40 cm. The value of R1 is (in ohm)
|
(a) 60 |
(b) 40 |
(c) 20 |
(d) 10 |
Two small spheres each carrying a charge q are placed r metre apart. If one of the spheres is taken around the other one in a circular path of radius r, the work done will be equal to
|
(a) Force between them × r |
(b) Force between them × 2πr |
|
(c) Force between them /2πr |
(d) Zero |
The wavelength of sodium light in air is 5890 Å. The velocity of light in air is 3 
The wavelength of light in a glass of refractive index 1.6 would be close to
|
(a) 5890 Å |
(b) 3681 Å |
(c) 9424 Å |
(d) 15078 Å |
An elementary particle of mass m and charge +e is projected with velocity v at a much more massive particle of charge Ze, where Z > 0. What is the closest possible approach of the incident particle
|
(a) |
(b) |
(c) |
(d) |
In a concave mirror experiment, an object is placed at a distance 
from the focus and the image is formed at a distance 
from the focus. The focal length of the mirror would be
|
(a) |
(b) |
(c) |
(d) |
The rays of different colors fail to converge at a point after going through a converging lens. This defect is called _________.
Which of the following is diamagnetism
|
(a) Aluminium |
(b) Quartz |
(c) Nickel |
(d) Bismuth |
The nucleus 
splits exactly in half in a fission reaction in which two neutrons are released. The resultant nuclei are
(a) 
|
(b) 
|
(c) 
|
(d) 
|
