For a given temperature difference, which of the following pairs will generate maximum thermo e.m.f.
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(a) Antimony-bismuth |
(b) Silver-gold |
(c) Iron-copper |
(d) Lead-nickel |
(a) Antimony-bismuth
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Coherent sources are those sources for which
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(a) Phase difference remain constant |
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(b) Frequency remains constant |
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(c) Both phase difference and frequency remains constant |
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(d) None of these |
Hubble's law states that the velocity with which the 'milky way' is moving away from the earth is proportional to
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(a) Square of the distance of the milky way from the earth |
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(b) Distance of milky way from the earth |
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(c) Mass of the milky way |
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(d) Product of the mass of the milky way and its distance from the earth |
The charge on a capacitor of capacitance 10 μF connected as shown in the figure is
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(a) 20 μC |
(b) 15 μC |
(c) 10 μC |
(d) Zero |
Equal charges are given to two spheres of different radii. The potential will
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(a) Be more on the smaller sphere |
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(b) Be more on the bigger sphere |
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(c) Be equal on both the spheres |
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(d) Depend on the nature of the materials of the spheres |
$\frac{1}{2}\text{mgR}$
$2\text{mgR}$
$\text{mgR}$
$\frac{1}{4}\text{mgR}$
Two thick wires and two thin wires, all of the same materials and same length form a square in the three different ways P, Q and R as shown in fig with current connection shown, the magnetic field at the centre of the square is zero in cases
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(a) In P only |
(b) In P and Q only |
(c) In Q and R only |
(d) P and R only |