The electric potential inside a conducting sphere
|
(a) Increases from centre to surface |
|
(b) Decreases from centre to surface |
|
(c) Remains constant from centre to surface |
|
(d) Is zero at every point inside |
(c) Remains constant from centre to surface
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Earth's magnetic field always has a horizontal component except at or Horizontal component of earth's magnetic field remains zero at
| (a) Equator | (b) Magnetic poles | (c) A latitude of 60o | (d) An altitude of 60o |
Charge on α -particle is
|
(a) |
(b) 1.6 |
(c) 3.2 |
(d) 6.4 |
The wavelength of X-rays is of the order of
|
(a) Centimetre |
(b) Micron (10-6 m) |
(c) Angstrom (10-10 m) |
(d) Metre |
The momentum of a photon is 3.3 
m/sec. Its frequency will be
|
(a) 3 |
(b) 6 |
(c) 7.5 |
(d) 1.5 |
According to Faraday's law of electromagnetic induction
|
(a) The direction of induced current is such that it opposes the cause producing it |
|
(b) The magnitude of induced e.m.f. produced in a coil is directly proportional to the rate of change of magnetic flux |
|
(c) The direction of induced e.m.f. is such that it opposes the cause producing it |
|
(d) None of the above |
In the diagram shown, the reading of voltmeter is 20 V and that of ammeter is 4 A. The value of R should be (Consider given ammeter and voltmeter are not ideal)
|
(a) Equal to 5Ω |
|
(b) Greater from 5 Ω |
|
(c) Less than 5 Ω |
|
(d) Greater or less than 5 Ω depends on the material of R |
The phenomenon of interference is shown by
|
(a) Longitudinal mechanical waves only |
(b) Transverse mechanical waves only |
|
(c) Electromagnetic waves only |
(d) All the above types of waves |
