Decay constant of radium is λ. By a suitable process its compound radium bromide is obtained. The decay constant of radium bromide will be
|
(a) λ |
(b) More than λ |
(c) Less than λ |
(d) Zero |
(a) λ
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The specific resistance of manganin is 
. The resistance of a cube of length 50 cm will be
|
(a) |
(b) 2.5 |
(c) |
(d) 5 |
Three resistances of magnitude 2, 3 and 5 ohm are connected in parallel to a battery of 10 volts and of negligible resistance. The potential difference across 3 Ω resistance will be
|
(a) 2 volts |
(b) 3 volts |
(c) 5 volts |
(d) 10 volts |
Two heater wires of equal length are first connected in series and then in parallel. The ratio of heat produced in the two cases is
|
(a) 2 : 1 |
(b) 1 : 2 |
(c) 4 : 1 |
(d) 1 : 4 |
An electron and a proton are at a distance of 1
. The moment of this dipole will be (C X m)
|
(a) 1.6 |
(b) 1.6 |
(c) 3.2 |
(d) 3.2 |
The magnetic field B with in the solenoid having n turns per metre length and carrying a current of i ampere is given by
|
(a) |
(b) |
(c) 4π |
(d) ni |
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) |
In a YDSE bi-chromatic light of wavelengths 400 nm and 560 nm are used. The distance between the slits is 0.1 mm and the distance between the plane of the slits and the screen is 1m. The minimum distance between two successive regions of complete darkness is
|
(a) 4 mm |
(b) 5.6 mm |
(c) 14 mm |
(d) 28 mm |
