A thermo couple develops 200μV between 0℃ and 100℃. If it develops 64μV and 76μV respectively between (0℃ - 32℃) and (32℃ - 70℃) then what will be the thermo emf it develops between 70℃ and 100℃
|
(a) 65 μV |
(b) 60 μV |
(c) 55 μV |
(d) 50 μV |
(b) 60 μV
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Radioactive nuclei that are injected into a patient collect at certain sites within its body, undergoing radioactive decay and emitting electromagnetic radiation. These radiations can then be recorded by a detector. This procedure provides an important diagnostic tool called
|
(a) Gamma camera |
(b) CAT scan |
|
(c) Radiotracer technique |
(d) Gamma ray spectroscopy |
A short pulse of white light is incident from air to a glass slab at normal incidence. After travelling through the slab, the first colour to emerge is:
Out of gravitational, electromagnetic, Vander Waals, electrostatic and nuclear forces; which two are able to provide an attractive force between two neutrons
|
(a) Electrostatic and gravitational |
|
(b) Electrostatic and nuclear |
|
(c) Gravitational and nuclear |
|
(d) Some other forces like Vander Waals |
Five balls numbered 1 to 5 are suspended using separate threads. Pairs (1, 2), (2, 4) and (4, 1) show electrostatic attraction, while pair (2, 3) and (4, 5) show repulsion. Therefore ball 1 must be
|
(a) Positively charged |
(b) Negatively charged |
(c) Neutral |
(d) Made of metal |
Current provided by a battery is maximum when
|
(a) Internal resistance equal to external resistance |
|
(b) Internal resistance is greater than external resistance |
|
(c) Internal resistance is less than external resistance |
|
(d) None of these |
As per this diagram a point charge +q is placed at the origin O. Work done in taking another point charge -Q from the point A [co-ordinates (0, a) ] to another point B [co-ordinates (a, 0)] along the straight path AB is
|
(a) Zero |
(b) |
(c) |
(d) |
