Explanation:
The false statement is Wheatstone bridge is susceptible to high dc current. It is actually not susceptible to high dc current and can give inaccurate readings if not balanced. The Wheatstone bridge measures resistance from few ohms tomega ohms.All the other statements are valid.
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The half-life of radon is 3.8 days. Three forth of a radon sample decay in
|
(a) 5.02 days |
(b) 15.2 days |
(c) 7.6 days |
(d) 11.4 days |
Two point charges placed at a certain distance r in air exert a force F on each other. Then the distance r' at which these charges will exert the same force in a medium of dielectric constant k is given by
|
(a) r |
(b) r/k |
(c) r/ |
(d) r |
If we express the energy of a photon in KeV and the wavelength in angstroms, then energy of a photon can be calculated from the relation
|
(a) E = 12.4 hv |
(b) E = 12.4 h/ |
(c) E = 12.4/ |
(d) E = hv |
The heat developed in an electric wire of resistance R by a current I for a time t is
|
(a) |
(b) |
(c) |
(d) |
A plane wavefront (λ = 6 
falls on a slit 0.4 mm wide. A convex lens of focal length 0.8 m placed behind the slit focusses the light on a screen. What is the linear diameter of second maximum
|
(a) 6mm |
(b) 12 mm |
(c) 3 mm |
(d) 9 mm |
If ne and vd be the number of electrons and drift velocity in a semiconductor. When the temperature is increased
|
(a) ne increases and vd decreases |
(b) ne decreases and vd increases |
| (c) Both ne and vd increases | (d) Both ne and vd decreases |
The ratio of thermionic currents (I/I0) for a metal when the temperature is slowly increased 
to T as shown in figure. (I and I0 are currents at T and respectively). Then which one is correct?
| (a) A | (b) B | (c) C | (d) D |
