An isolated solid metallic sphere is given +Q charge. The charge will be distributed on the sphere
|
(a) Uniformly but only on surface |
|
(b) Only on surface but non-uniformly |
|
(c) Uniformly inside the volume |
|
(d) Non-uniformly inside the volume |
(a) Uniformly but only on surface
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A silver ball of radius 4.8 cm is suspended by a thread in the vacuum chamber. UV light of wavelength 200 nm is incident on the ball for some times during which a total energy of 1 × 10–7 J falls on the surface. Assuming on an average one out of 103 photons incident is able to eject electron. The potential on sphere will be
|
(a) 1 V |
(b) 2 V |
(c) 3 V |
(d) Zero |
In the following atoms and moleculates for the transition from n = 2 to n = 1, the spectral line of minimum wavelength will be produced by
|
(a) Hydrogen atom |
(b) Deuterium atom |
(c) Uni-ionized helium |
(d) di-ionized lithium |
In the given nuclear reaction, how many a and b particles are emitted 
|
(a) 3a particles and 2b particle |
(b) 4a particles and 3b particle |
|
(c) 6a particles and 4b particle |
(d) 7a particles and 4b particle |
On increasing the number of electrons striking the anode of an X-ray tube, which one of the following parameters of the resulting X-rays would increase
| (a) Penetration power | (b) Frequency | (c) Wavelength | (d) Intensity |
When connected across the terminals of a cell, a voltmeter measures 5V and a connected ammeter measures 10 A of current. A resistance of 2 ohms is connected across the terminals of the cell. The current flowing through this resistance will be
|
(a) 2.5 A |
(b) 2.0 A |
(c) 5.0 A |
(d) 7.5 A |