Point charge 
and 
are kept at points x = 0 and x = 6 respectively. Electrical potential will be zero at points
|
(a) x = 2 and x = 9 |
(b) x = 1 and x = 5 |
(c) x = 4 and x = 12 |
(d) x = -2 and x = 2 |
(c) x = 4 and x = 12
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In X-ray tube when the accelerating voltage V is halved, the difference between the wavelength of Ka line and minimum wavelength of continuous X-ray spectrum
|
(a) Remains constant |
(b) Becomes more than two times |
|
(c) Becomes half |
(d) Becomes less than two times |
A charged particle q is shot towards another charged particle Q which is fixed, with a speed v. It approaches Q upto a closest distance r and then returns. If q were given a speed 2v, the closest distances of approach would be
|
(a) r |
(b) 2r |
(c) r/2 |
(d) r/4 |
When a 
atom is bombarded with α - particles, one of the product of nuclear transmutation is 
. The other is
|
(a) |
(b) |
(c) |
(d) |
The time period of a freely suspended magnet is 2 sec. If it is broken in length into two equal parts and one part is suspended in the same way, then its time period will be
| (a) 4 sec | (b) 2 sec |
(c) 
|
(d) 1 sec |
If 
and 
be the numbers of holes and conduction electrons in an extrinsic semiconductor, then
|
(a) |
|
(b) |
|
(c) |
|
(d) |
