and 
represents gravitational and electrostatic force respectively between electrons situated at a distance 10 cm. The ratio of 
is of the order of
|
(a) |
(b) 10 |
(c) 1 |
(d) |
(d) 
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
An atomic nucleus 
emits several a and b radiations and finally reduces to 
. It must have emitted
|
(a) 4a and 2b |
(b) 6a and 4b |
(c) 8a and 24b |
(d) 4a and 16b |
A small lamp is hung at a height of 8 feet above the centre of a round table of diameter 16 feet. The ratio of intensities of illumination at the centre and at points on the circumference of the table will be
|
(a) 1 : 1 |
(b) 2 : 1 |
(c) 2 |
(d) 3 : 2 |
The nuclear reaction 
(mass of deuteron = 2.0141 a.m.u. and mass of He = 4.0024 a.m.u.) is
|
(a) Fusion reaction releasing 24 MeV energy |
|
(b) Fusion reaction absorbing 24 MeV energy |
|
(c) Fission reaction releasing 0.0258 MeV energy |
|
(d) Fission reaction absorbing 0.0258 MeV energy |
A magnetic needle is made to vibrate in uniform field H, then its time period is T. If it vibrates in the field of intensity 4H, its time period will be
| (a) 2T | (b) T/2 | (c) 2/T | (c) 2/T |
Four condensers are joined as shown in the adjoining figure. The capacity of each is 8 μF. The equivalent capacity between the points A and B will be
|
(a) 32 μF |
(b) 2 μF |
(c) 8 μF |
(d) 16 μF |
A planet of mass M has a satellite of mass m, revolving around the planet in a circular orbit of radius r and time period T. The mass (M) of the planet is
|
(a) |
(b) |
(c) |
(d) |
Two conducting circular loops of radii 
and 
are placed in the same plane with their centres coinciding. If 
, the mutual inductance M between them will be directly proportional to
|
(a) |
(b) |
(c) |
(d) |
The average life T and the decay constant λ of a radioactive nucleus are related as
|
(a) T λ = 1 |
(b) T = |
(c) |
(d) T = |
