Explanation:
þ An emf is induced in the loop is it is rotated about a diameter
þ An emf is induced in the loop if it is deformed.
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Average energy stored in a pure inductance L when a current i flows through it, is
|
(a) |
(b) |
(c) |
(d) |
For non-conductors, the energy gap is
|
(a) 6 eV |
(b) 1.1 eV |
(c) 0.8 eV |
(d) 0.3 eV |
In Millikan's oil drop experiment an oil drop carrying a charge Q is held stationary by a potential difference 2400 V between the plates. To keep a drop of half the radius stationary the potential difference had to be made 600 V. What is the charge on the second drop
|
(a) |
(b) |
(c) Q |
(d) |
Which of the following statement is wrong
|
(a) Voltmeter should have high resistance |
|
(b) Ammeter should have low resistance |
|
(c) Ammeter is placed in parallel across the conductor in a circuit |
|
(d) Voltmeter is placed in parallel across the conductor in a circuit |
The smallest temperature difference that can be measured with a combination of a thermocouple of thermo e.m.f. 30mV per degree and a galvanometer of 50 ohm resistance, capable of measuring a minimum current of 3 × 10–7 amp is
|
(a) 0.5 degree |
(b) 1.0 degree |
(c) 1.5 degree |
(d) 2.0 degree |
Nuclear fission experiments show that the neutrons split the uranium nuclei into two fragments of about same size. This process is accompanied by the emission of several
|
(a) Protons and positrons |
(b) a - particles |
|
(c) Neutrons |
(d) Protons and a-particles |
The work function of sodium is 2.3 eV. The threshold wavelength of sodium will be
|
(a) 2900 Å |
(b) 2500 Å |
(c) 5380 Å |
(d) 2000 Å |
When cells are connected in parallel, then
|
(a) The current decreases |
(b) The current increases |
|
(c) The e.m.f. increases |
(d) The e.m.f. decreases |
