- AFor an electron as well as for a photon
- BFor an electron but not for a photon
- CFor an photon but not for an electron
- DNeither for an electron nor for a photon
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From a newly formed radioactive substance (Half life 2 hours), the intensity of radiation is 64 times the permissible safe level. The minimum time after which work can be done safely from this source is
|
(a) 6 hours |
(b) 12 hours |
(c) 24 hours |
(d) 128 hours |
Image formed by a concave mirror of focal length 6 cm, is 3 times of the object, then the distance of object from mirror is
|
(a) – 4 cm |
(b) 8 cm |
(c) 6 cm |
(d) 12 cm |
A moving conductor coil in a magnetic field produces an induced e.m.f. This is in accordance with
|
(a) Amperes law |
(b) Coulomb law |
(c) Lenz’s law |
(d) Faraday’s law |
Assertion : Separation of isotope is possible because of the difference in electron numbers of isotope.
Reason : Isotope of an element can be separated by using a mass spectrometer.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If assertion is false but reason is true. |
A pendulum bob of mass 30.7
and carrying a charge
is at rest in a horizontal uniform electric field of 20000 V/m. The tension in the thread of the pendulum is (g = 9.8
|
(a) 3 |
(b) 4 |
(c) 5 |
(d) 6 |