An alpha particle is accelerated through a potential difference of 
. Its kinetic energy will be
|
(a) 1 MeV |
(b) 2 MeV |
(c) 4 MeV |
(d) 8 MeV |
(b) 2 MeV
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
If in the circuit, power dissipation is 150 W, then R is
|
(a) 2 W |
(b) 6 W |
(c) 5 W |
(d) 4 W |
Hydrogen atoms are excited from ground state of the principal quantum number 4. Then the number of spectral lines observed will be
|
(a) 3 |
(b) 6 |
(c) 5 |
(d) 2 |
A glass rod rubbed with silk is used to charge a gold leaf electroscope and the leaves are observed to diverge. The electroscope thus charged is exposed to X-rays for a short period. Then
|
(a) The divergence of leaves will not be affected |
|
(b) The leaves will diverge further |
|
(c) The leaves will collapse |
|
(d) The leaves will melt |
The minimum wavelength of X-rays produced in a coolidge tube operated at potential difference of 40 kV is
|
(a) 0.31 Å |
(b) 3.1 Å |
(c) 31 Å |
(d) 311 Å |
Three charges 4q, Q and q are in a straight line in the position of 0, l/2 and l respectively. The resultant force on q will be zero, if Q =
|
(a) – q |
(b) -2q |
(c) |
(d) 4q |
An AM wave has 1800 watt of total power content, For 100% modulation the carrier should have power content equal to
|
(a) 1000 watt |
(b) 1200 watt |
(c) 1500 watt |
(d) 1600 watt |
What is the effective capacitance between A and B in the following figure
|
(a) 1 μF |
(b) 2 μF |
(c) 1.5 μF |
(d) 2.5 μF |
