- Electromagnetic.
- Gravitational.
- Nuclear.
- Weak.
Explanation:
The force of viscosity arises from molecular Interaction between different layers of fluids that are In motion. Molecular forces are electromagnetic in nature. Therefore, viscosity must also be electromagnetic.
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Three electric bulbs of rating 60W each are joined in series and then connected to electric mains. The power consumed by these three bulbs will be
|
(a) 180 W |
(b) 60 W |
(c) 20 W |
(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 |
Which one is reverse-biased
|
(a)
|
(b)
|
(c)
|
(d)
|
A convex lens is made up of three different materials as shown in the figure. For a point object placed on its axis, the number of images formed are

|
(a) 1 |
(b) 5 |
(c) 4 |
(d) 3 |
How much kinetic energy will be gained by an α - particle in going from a point at 70 V to another point at 50 V
|
(a) 40 eV |
(b) 40 keV |
(c) 40 MeV |
(d) 0 eV |