An element A decays into element C by a two step process :
A → B + 
B → C + 
Then
|
(a) A and C are isotopes |
(b) A and C are isobars |
|
(c) A and B are isotopes |
(d) A and B are isobars |
(a) A and C are isotopes
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The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 × 
cm is
|
(a) 80 volts |
(b) 8 |
(c) 9 volts |
(d) 9 |
In the hysteresis cycle, the value of H needed to make the intensity of magnetisation zero is called
|
(a) Retentivity |
(b) Coercive force |
(c) Lorentz force |
(d) None of the above |
A tall man of height 6 feet, want to see his full image. Then required minimum length of the mirror will be-
For a triode 
kilo ohm and 
milli mho. If the load resistance is double of plate resistance, then the value of voltage gain will be
|
(a) 10 |
(b) 20 |
(c) 15 |
(d) 30 |
A copper rod of length l is rotated about one end perpendicular to the magnetic field B with constant angular velocity ω. The induced e.m.f. between the two ends is
|
(a) |
(b) |
(c) |
(d) |
Which of the following is not the property of a cathode ray
|
(a) It casts shadow |
(b) It produces heating effect |
|
(c) It produces flurosence |
(d) It does not deflect in electric field |
