MCQ
Emission spectrum of CO2 gas:
- AIs a line spectrum
- BIs a band spectrum
- CIs a continuous spectrum
- DDoes not fall in the visible region
Explanation:
The emission spectrum of CO2 gas that has been studied by the electron beam excitation method is a band spectrum.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
A magnet makes 40 oscillations per minute at a place having magnetic field intensity of 0.1 × 10–5 T. At another place, it takes 2.5 sec to complete one vibration. The value of earth’s horizontal field at that place is
|
(a) 0.25 × 10–6 T |
(b) 0.36 × 10–6 T |
(c) 0.66 × 10–8 T |
(d) 1.2 × 10–6 T |
A thin metal plate P is inserted half way between the plates of a parallel plate capacitor of capacitance C in such a way that it is parallel to the two plates. The capacitance now becomes
|
(a) C |
(b) C/2 |
(c) 4C |
(d) None of these |
Which of the following form(s) a virtual and erect image for all positions of the object
|
(a) Convex lens |
(b) Concave lens |
(c) Convex mirror |
(d) b, c |
Finger prints are observed by the use of
|
(a) Telescope |
(b) Microscope |
(c) Gallilean telescope |
(d) Concave lens |
The image which can not be taken on the screen is called:
A double convex lens has two surfaces of equal radii R and refractive index $\mu=1.5$ We have,
As per Bohr model, the minimum energy (in eV) required to remove an electron from the ground state of doubly ionized Li atom (Z = 3) is
|
(a) 1.51 |
(b) 13.6 |
(c) 40.8 |
(d) 122.4 |