Vibration magnetometer is used for comparing
|
(a) Magnetic fields |
(b) Earth's field |
(c) Magnetic moments | (d) All of the above |
Vibration magnetometer is used for comparing
|
(a) Magnetic fields |
(b) Earth's field |
(c) Magnetic moments | (d) All of the above |
(d) All of the above
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The maximum distance upto which TV transmission from a TV tower of height h can be received is proportional to
|
(a) h1/2 |
(b) h |
(c) h3/2 |
(d) h2 |
100 cells each of e.m.f. 5 V and internal resistance 1 ohm are to be arranged so as to produce maximum current in a 25 ohms resistance. Each row is to contain equal number of cells. The number of rows should be
|
(a) 2 |
(b) 4 |
(c) 5 |
(d) 10 |
Two metal spheres of capacitance
and
carry some charges. They are put in contact and then separated. The final charges
and
on them will satisfy
|
(a) |
(b) |
(c) |
(d) |
A calcite crystal is placed over a dot on a piece of paper and rotated, on seeing through the calcite one will be see
|
(a) One dot |
(b) Two stationary dots |
|
(c) Two rotating dots |
(d) One dot rotating about the other |
When ultraviolet rays are incident on metal plate, then photoelectric effect does not occurs. It occurs by the incidence of
|
(a) X-rays |
(b) Radio wave |
(c) Infrared rays |
(d) Green house effect |
Shown in the figure is a circular loop of radius r and resistance R. A variable magnetic field of induction
is established inside the coil. If the key (K) is closed, the electrical power developed right after closing the switch is equal to

|
(a) |
(b) |
(c) |
(d) |