Three resistances of one ohm each are connected in parallel. Such connection is again connected with 2/3 Ω resistor in series. The resultant resistance will be
|
(a) |
(b) |
(c) 1 Ω |
(d) |
(c) 1 Ω
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When the current through a solenoid increases at a constant rate, the induced current
|
(a) Is constant and is in the direction of the inducing current |
|
(b) Is a constant and is opposite to the direction of the inducing current |
|
(c) Increases with time and is in the direction of the inducing current |
|
(d) Increases with time and opposite to the direction of the inducing current |
A parallel plate capacitor with air as medium between the plates has a capacitance of 10 μF. The area of capacitor is divided into two equal halves and filled with two media as shown in the figure having dielectric constant 
and 
. The capacitance of the system will now be
|
(a) 10 μF |
(b) 20 μF |
(c) 30 μF |
(d) 40 μF |
For the study of the helical structure of nucleic acids, the property of electromagnetic radiation generally used is
|
(a) Reflection |
(b) Interference |
(c) Diffraction |
(d) Polarization |
Light of different colours propagates through air
|
(a) With the velocity of air |
|
(b) With different velocities |
|
(c) With the velocity of sound |
|
(d) Having the equal velocities |
A magnet is brought towards a coil (i) speedly (ii) slowly then the induced e.m.f./induced charge will be respectively
|
(a) More in first case / More in first case |
|
(b) More in first case/Equal in both case |
|
(c) Less in first case/More in second case |
|
(d) Less in first case/Equal in both case |
In a P-type semi-conductor, germanium is dopped with
|
(a) Gallium |
(b) Boron |
(c) Aluminium |
(d) All of these |
