Explanation:
12C and 14C are the two isotopes of carbon atom that have same atomic number, but different mass numbers. This means that they have same number of protons and electrons, but different number of neutrons. Therefore, 12C has 6 protons, 6 electrons and 6 neutrons, whereas 14C has 6 electrons, 6 protons and 8 neutrons.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
A bar magnet of magnetic moment 200 A-m2 is suspended in a magnetic field of intensity 0.25 N/A-m. The couple required to deflect it through 30o is
|
(a) 50 N-m |
(b) 25 N-m |
(c) 20 N-m |
(d) 15 N-m |
The percentage of Sun's total energy which reaches the earth's surface is
|
(a) 10–7 % |
(b) 10–6 % |
(c) 10–3 % |
(d) 10–2 % |
A soap bubble is given a negative charge, then its radius
|
(a) Decreases |
|
(b) Increases |
|
(c) Remains unchanged |
|
(d) Nothing can be predicted as information is insufficient |
Ratio of the wavelengths of first line of Lyman series and first line of Balmer series is
|
(a) 1: 3 |
(b) 27 : 5 |
(c) 5 : 27 |
(d) 4 : 9 |
Two infinitely long parallel wires carry equal current in same direction. The magnetic field at a mid point in between the two wires is
|
(a) Twice the magnetic field produced due to each of the wires |
|
(b) Half of the magnetic field produced due to each of the wires |
|
(c) Square of the magnetic field produced due to each of the wires |
|
(d) Zero |
In an L–R circuit connected to a battery the rate at which energy is stored in the inductor is plotted against time during the growth of the current in the circuit. Which of the following best represents the resulting curve
|
(a)
|
(b)
|
(c)
|
(d)
|
Below figures (1) and (2) represent lines of force. Which is correct statement
|
(a) Figure (1) represents magnetic lines of force |
|
(b) Figure (2) represents magnetic lines of force |
|
(c) Figure (1) represents electric lines of force |
|
(d) Both figure (1) and figure (2) represent magnetic lines of force |
