- AHelium
- BXenon
- CNeon
- DArgon
Explanation:
Pierre Janssen discovered the gaseous nature of the solar chromosphere and with some justification the element helium.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
The combination of gates shown below produces
| (a) AND gate | (b) XOR gate | (c) NOR gate | (d) NAND gate |
A hollow metallic sphere of radius R is given a charge Q. Then the potential at the centre is
|
(a) Zero |
(b) |
(c) |
(d) |
A radioactive substance emits
|
(a) Electromagnetic radiation |
(b) Electrons revolving around the nucleus |
|
(c) Charged particles |
(d) a,c |
A straight wire carrying current i is turned into a circular loop. If the magnitude of magnetic moment associated with it in M.K.S. unit is M, the length of wire will be
|
(a) 4πiM |
(b) |
(c) |
(d) |
When the object is self-luminous, the resolving power of a microscope is given by the expression
|
(a) |
(b) |
(c) |
(d) |
In the disintegration series
The value of Z and A respectively will be
|
(a) 92, 236 |
(b) 88, 230 |
(c) 90, 234 |
(d) 91, 234 |
The dependence of binding energy per nucleon,
on the mass number, A, is represented by
|
(a)
|
(b)
|
(C)
|
(d)
|