Two coherent sources of light can be obtained by
|
(a) Two different lamps |
|
(b) Two different lamps but of the same power |
|
(c) Two different lamps of same power and having the same colour |
|
(d) None of the above |
(d) None of the above
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and 
represent mass of neutron and proton respectively. If an element having atomic mass M has N-neutron and Z-proton, then the correct relation will be
|
(a) |
(b) |
(c) |
(d) |
Three capacitors are connected to D.C. source of 100 volts shown in the adjoining figure. If the charge accumulated on plates of 
and 
are 
and 
respectively, then
|
(a) |
(b) |
|
(c) |
(d) |
A conducting ring of radius 1 meter is placed in an uniform magnetic field B of 0.01Telsa oscillating with frequency 100Hz with its plane at right angles to B. What will be the induced electric field
|
(a) π volt/m |
(b) 2 volt/m |
(c) 10 volt/m |
(d) 62 volt/m |
If luminous efficiency of a lamp is 2 lumen/watt and its luminous intensity is 42 candela, then power of the lamp is
|
(a) 62 W |
(b) 76 W |
(c) 138 W |
(d) 264 W |
The diameter of each plate of an air capacitor is 4 cm. To make the capacity of this plate capacitor equal to that of 20 cm diameter sphere, the distance between the plates will be
|
(a) 4 |
(b) 1 |
(c) 1 cm |
(d) 1 |
