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℃
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(a) 65 μV |
(b) 60 μV |
(c) 55 μV |
(d) 50 μV |
(b) 60 μV
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Peltier co-efficient of a thermo couple is 2 nano volts. How much heat is developed at a junction if 2.5 amp current flows for 2 minute
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(a) 6 ergs |
(b) 6 |
(c) 16 ergs |
(d) 6 |
The direction of magnetic lines of forces close to a straight conductor carrying current will be
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(a) Along the length of the conductor |
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(a) Along the length of the conductor |
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(c) Circular in a plane perpendicular to the conductor |
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(d) Helical |
Consider a parallel plate capacitor of 10 μF (micro-farad) with air filled in the gap between the plates. Now one half of the space between the plates is filled with a dielectric of dielectric constant 4, as shown in the figure. The capacity of the capacitor changes to
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(a) 25 μF |
(b) 20 μF |
(c) 40 μF |
(d) 5 μF |
A coil having N turns carry a current I as shown in the figure. The magnetic field intensity at point P is
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(a) |
(b) |
(c) |
(d) Zero |
Assertion : The focal length of the mirror is f and distance of the object from the focus is u, the magnification of the mirror is f / u.
Reason : Magnification = 
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
What percentage of original radioactive atoms is left after five half lives
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(a) 0.3% |
(b) 1% |
(c) 31% |
(d) 3.125% |
If each of the resistance of the network shown in the figure is R, the equivalent resistance between A and B is
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(a) 5 R |
(b) 3 R |
(c) R |
(d) R/2 |
