Radioactivity is
|
(a) Irreversible process |
(b) Self disintegration process |
|
(c) Spontaneous process |
(d) All of the above |
Radioactivity is
|
(a) Irreversible process |
(b) Self disintegration process |
|
(c) Spontaneous process |
(d) All of the above |
(d) All of the above
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A 25 W, 220 V bulb and a 100 W, 220 V bulb are connected in parallel across a 440 V line
|
(a) Only 100 watt bulb will fuse |
(b) Only 25 watt bulb will fuse |
|
(c) Both bulbs will fuse |
(d) None of the bulbs will fuse |
The magnifying power of a simple microscope can be increased, if we use eye-piece of
|
(a) Higher focal length |
(b) Smaller focal length |
|
(c) Higher diameter |
(d) Smaller diameter |
The half-life of radioactive Polonium (Po) is 138.6 days. For ten lakh Polonium atoms, the number of disintegrations in 24 hours is
|
(a) 2000 |
(b) 3000 |
(c) 4000 |
(d) 5000 |
Statement-2: NOT gate inverts the input order.
Which of the following has a negative temperature coefficient
|
(a) C |
(b) Fe |
(c) Mn |
(d) Ag |
The refractive index of water is 1.33. The direction in which a man under water should look to see the setting sun is
|
(a) 49o to the horizontal |
(b) 90o with the vertical |
|
(c) 49o to the vertical |
(d) Along the horizontal |
An arbitrary shaped closed coil is made of a wire of length L and a current I ampere is flowing in it. If the plane of the coil is perpendicular to magnetic field
, the force on the coil is
|
(a) Zero |
(b) IBL |
(c) 2IBL |
(d) |