Resistance of semiconductor at 0 K is
|
(a) Zero |
(b) Infinite |
(c) Large |
(d) Small |
Resistance of semiconductor at 0 K is
|
(a) Zero |
(b) Infinite |
(c) Large |
(d) Small |
(b) Infinite
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The resultant capacitance of given circuit is
|
(a) 3C |
(b) 2C |
(c) C |
(d) |

Force of attraction between two point charges Q and -Q separated by d metre is . When these charges are placed on two identical spheres of radius R = 0.3d whose centres are d metre apart, the force of attraction between them is
|
(a) Greater than |
(b) Equal to |
(c) Less than |
(d) Less than |
Which of the following radiations has the least wavelength
|
(a) X-rays |
(b) g-rays |
(c) b -rays |
(d) a-rays |
The equivalent capacitance between A and B in the figure is 1 μF. Then the value of capacitance C is
|
(a) 1.4 μF |
(b) 2.5 μF |
(c) 3.5 μF |
(d) 1.2 μF |
The mass of a neutron is the same as that of
|
(a) A proton |
(b) A meson |
(c) An epsilon |
(d) An electron |
In a lossless transformer an alternating current of 2 amp is flowing in the primary coil. The number of turns in the primary and secondary coils are 100 and 20 respectively. The value of the current in the secondary coil is
|
(a) 0.08 A |
(b) 0.4 A |
(c) 5 A |
(d) 10 A |
In the lowest energy level of hydrogen atom, the electron has the angular momentum
|
(a) |
(b) h/ |
(c) h/2 |
(d) |
Assertion : All the radioactive elements are ultimately converted in lead.
Reason : All the elements above lead are unstable.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |