CBSE
Multiple Choice QuestionsHighest energy will be absorbed to eject out the electron in the configuration.
1s22s22p1
1s22s22p3
1s22s22p2
1s22s22p4
An electron is moving in Bohr's fourth orbit. Its de-Broglie wave length is . What is the circumference of the fourth orbit?
2
4
The ratio of the difference in energy between the first and the second Bohr orbit to that between the second and the third Bohr orbit is
The Vividh Bharti Station of All India Radio, Delhi, broadcasts on a frequency of 1,368 kHz (Kilohertz). Calculate the wavelength () of the electromagnetic radiation emitted by transmitter. Which part of the electromagnetic spectrum does it belong to?
319.4 m and X-rays
319.4 m and radiowave
219.3 m and microwave
219.3 m and radiowave
In an atom, an electron is moving with a speed of 600 m/s with an accuracy of 0.005%. Certainty with which the position of the electron can be located is
(Given, h= 6.6 x 10-34 kg m2 s-1, mass of electron em = 9.1 x 10-31 kg)
215 x 10-3 m
2.78 x 10-3 m
1.92 x 10-3 m
3.24 x 10-3 m
Which one of the following sets of quantum numbers represents the highest energy level in an atom?
n = 4; l = 0; m = 0; s = +
n = 3; l = 1; m = 1; s = +
n = 3; l = 2; m = -2; s = +
n = 3; l = 0; m = 0; s = +
What will be the number of waves formed by a Bohr electron in one complete revolution in its second orbit?
Three
Two
One
Zero
If n = 6, the correct sequence for filling of electrons will be
ns (n - 1)d (n - 2)f np
ns (n - 2)f np (n - 1)d
ns np (n - 1)d (n - 2)f
ns (n - 2)f (n - 1)d np
Match the particle with its characteristic
| Column I | Column II |
| A. -particle | p. Slow moving |
| B. Isobar | q. High penetration power |
| C. - ray | r. Same atomic mass |
| D. - particle | s. consists of electron |
A - p; B - r; C - q; D - s
A - p; B - q; C - r; D - s
A - r; B - s; C - p; D - q
A - s; B - r; C - p; D - q
Maximum number of electrons in a subshell of an atom determined by the following?
4l + 2
2n2
4l - 2
2l + 1
