Two straight parallel wires, both carrying 10 ampere in the same direction attract each other with a force of 1
. If both currents are doubled, the force of attraction will be
|
(a) 1 |
(b) 2 |
(c) 4 |
(d) 0.25 |
(c) 4
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Two thin lenses of focal lengths f1 and f2 are in contact. The focal length of this combination is
|
(a) |
(b) |
(c) |
(d) |
Best neutron moderator is
|
(a) Berillium oxide |
(b) Pure water |
(c) Heavy water |
(d) Graphite |
In an experiment, a graph was plotted of the potential difference V between the terminals of a cell against the circuit current i by varying load rheostat. Internal conductance of the cell is given by
|
(a) xy |
(b) |
(c) |
(d) (x – y) |
The resistance of a galvanometer coil is R. What is the shunt resistance required to convert it into an ammeter of range 4 times
|
(a) |
(b) |
(c) |
(d) 4 R |
The minimum wavelength of photon is 5000 Å, its energy will be
|
(a) 2.5 eV |
(b) 50 V |
(c) 5.48 eV |
(d) 7.48 eV |
Carbon dating is best suited for determining the age of fossils if their age in years is of the order of
(a) 
|
(b) 
|
(c) 
|
(d) 
|
