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Latest UP Lekhpal Updates
Last updated on Sep 22, 2022
The Uttar Pradesh Subordinate Services Selection Commission, on 7th September 2022 had released the final answer key of the UP Lekhpal mains exam for advt no 01/2022. The UP Lekhpal Exam was conducted on 31st July 2022. The candidates can calculate their scores using the final answer key and the marking scheme of the exam. It is expected that the board will soon release the merit list. This cycle is ongoing for 8085 vacancies where candidates between the age of 21 to 40 years were eligible to apply. Know the UP Lekhpal Answer key details here.
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Problem 1 Easy Difficulty
Which of the following structures have no electrical charge?
a. protons
b. electrons
c. neutrons
d. ions
Video Transcript
So this question is asking which of the following do not have an electrical charge? Um, so, um, Proton is a subatomic particle which exists in the nucleus of the atom. What you can see in this little lithium Adam diagram I've drawn, um, so Proton has a positive charge, so, um, we can remove It is an option for the question. Um, similarly, an electron is a subatomic particle which orbits the nucleus. Um, and it has a negative church, so you can also remove it. Um, and an eye on refers to Adams, which have an unequal number of protons and electrons. Say, for example, in this lithium ion. Right now, there are three protons and three electrons. But if I delete this one, um, electron, this will then become a lithium ion with a positive charge, as there are more protons and electrons, um, so ions are can have a positive or negative charge, so it can be an option to this question. So that only leaves neutrons which exists in the nucleus of the atom, and neutrons do not have a charge