In a parallel plate capacitor of capacitance C, a metal sheet is inserted between the plates, parallel to them. If the thickness of the sheet is half of the separation between the plates. The capacitance will be
|
(a) |
(b) |
(c) 4C |
(d) 2C |
(d) 2C
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Consider a radioactive material of half-life 1.0 minute. If one of the nuclei decays now, the next one will decay
|
(a) After 1 minute |
|
(b) After |
|
(c) After |
|
(d) After any time |
In the nuclear reaction 
what does X stand for
|
(a) An electron |
(b) A proton |
(c) A neutron |
(d) A neutrino |
In Young's double slit experiment, the phase difference between the light waves reaching third bright fringe from the central fringe will be (λ =6000 Å )
|
(a) Zero |
(b) 2π |
(c) 4 π |
(d) 6 π |
What will be the equivalent resistance between the two points A and D
|
(a) 10 Ω |
(b) 20 Ω |
(c) 30 Ω |
(d) 40 Ω |
If the threshold wavelength for sodium is 5420 Å, then the work function of sodium is
|
(a) 4.58 eV |
(b) 2.28 eV |
(c) 1.14 eV |
(d) 0.23 eV |
While tuning in a certain broadcast station with a receiver, we are actually
|
(a) Varying the local oscillator frequency |
|
(b) Varying the frequency of the radio signal to be picked up |
|
(c) Tuning the antenna |
|
(d) None of these |
Which of the following phenomena suggests the presence of electron energy levels in atoms
|
(a) Radio active decay |
(b) Isotopes |
|
(c) Spectral lines |
(d) a -particles scattering |
If the kinetic energy of a free electron doubles, its de-Broglie wavelength changes by the factor
|
(a) |
(b) |
(c) |
(d) 2 |
