- AEmission
- BAbsorption
- CEmission and Absorption
- DMolecular spectrum
Explanation:
To identify the element in the mixture we used emission and obsorption spectra.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
For a nucleus to be stable, the correct relation between neutron number N and Proton number Z is
|
(a) N > Z |
(b) N = Z |
(c) N < Z |
(d) N ≥ Z |
Light travels through a glass plate of thickness t and having refractive index n. If c is the velocity of light in vacuum, the time taken by the light to travel this thickness of glass is
|
(a) |
(b) tnc |
(c) |
(d) |
Three charges each of magnitude q are placed at the corners of an equilateral triangle, the electrostatic force on the charge placed at the center is (each side of triangle is L)
|
(a) Zero |
(b) |
(c) |
(d) |

In extrinsic P and N-type, semiconductor materials, the ratio of the impurity atoms to the pure semiconductor atoms is about
|
(a) 1 |
(b) |
(c) |
(d) |
The bit rate for a signal, which has a sampling rate of 8 kHz and where 16 quantisation levels have been used is
|
(a) 32000 bits/sec |
(b) 16000 bits/sec |
(c) 64000 bits/sec |
(d) 72000 bits/sec |
A light bulb, a capacitor and a battery are connected together as shown here, with switch S initially open. When the switch S is closed, which one of the following is true

|
(a) The bulb will light up for an instant when the capacitor starts charging |
|
(b) The bulb will light up when the capacitor is fully charged |
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(c) The bulb will not light up at all |
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(d) The bulb will light up and go off at regular intervals |
Three observers A, B and C measure the speed of light coming from a source to be
and
. The observer A moves towards the source, the observer C moves away from the source with the same speed. The observer B stays stationary. the surrounding space is vacuum every where. Then
|
(a) |
(b) |
(c) |
(d) |