MCQ
A chlorine atom whose nucleus contains 17 protons and 20 neutrons. Find out the composition of the nucleus of an isotope of chlorine?
- A20 protons, 17 neutrons
- B19 protons, 18 neutrons
- C18 protons, 18 neutrons
- D17 protons, 19 neutrons
✓
Answer
- 17 protons, 19 neutrons
Explanation:
Isotope nucleus means that those nucleus has same protons number but different neutrons and mass number. Since chlorine has 17 protons so its isotope also will have 17 protons.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
As per this diagram a point charge +q is placed at the origin O. Work done in taking another point charge -Q from the point A [co-ordinates (0, a) ] to another point B [co-ordinates (a, 0)] along the straight path AB is
|
(a) Zero |
(b) |
(c) |
(d) |
Assertion : The ion cannot move with a speed beyond a certain limit in a cyclotron.
Reason : As velocity increases time taken by ion increases.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
Vapour is injected at a uniform rate in a closed veseel which was initially evacuated. The pressure in the vessel:
- Increaaes continuously.
- Decreases continuously.
- First increases and then decreases.
- First increases and then becomes constant.
Cathode rays are
|
(a) Positive rays |
(b) Neutral rays |
(c) He rays |
(d) Electron waves |
In a projectile motion the velocity:
- Is always perpendicular to the acceleration.
- Is never perpendicular to the acceleration.
- Is perpendicular to the acceleration for one instant only.
- Is perpendicular to the acceleration for two instants.
Assertion : The magnetic filed at the ends of a very long current carrying solenoid is half of that at the center.
Reason : If the solenoid is sufficiently long, the field within it is uniform.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
Identify the type of materials which have resistivities in the range of 10-8 Ωm to 10-6 Ωm.
The 
X-ray emission line of tungsten occurs at λ = 0.021 nm. The energy difference between K and L levels in this atom is about
| (a) 0.51MeV | (b) 1.2 MeV | (c) 59 KeV | (d) 13.6 eV |
In a closed circuit of resistance 10 $\Omega$, the linked flour varies with time according to relation $\phi=6t^{2}-t+1.$ At $t=0.25$ second, the current (in Ampere) flowing through the circuit is :
→One metallic sphere A is given positive charge whereas another identical metallic sphere B of exactly same mass as of A is given equal amount of negative charge. Then
|
(a) Mass of A and mass of B still remain equal |
|
(b) Mass of A increases |
|
(c) Mass of B decreases |
|
(d) Mass of B increases |