General Science/Everyday Science MCQs
Topic Notes: General Science/Everyday Science
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
41
What is the primary way to prevent the spread of Malaria in a community?
Answer:
Using mosquito nets and eliminating standing water
Malaria is transmitted by mosquitoes that breed in stagnant water. By removing these breeding sites and using physical barriers like bed nets or chemical repellents, the contact between the vector and the human host is reduced, lowering infection rates.
42
What happens during a 'Vaccination'?
Answer:
A weakened or dead pathogen is introduced to trigger an immune response
Vaccines contain antigens from a pathogen (weakened, killed, or just parts of it). When injected, the immune system recognizes these as 'foreign' and produces antibodies and memory cells without the person actually getting sick from the disease.
43
Who proposed the 'Uncertainty Principle'?
Answer:
Werner Heisenberg
Heisenberg's Uncertainty Principle states that it is impossible to simultaneously determine both the exact position and momentum of a particle, such as an electron, with perfect accuracy.
44
The 'valence' of an atom refers to:
Answer:
The number of electrons in the outermost shell
Valence electrons are the electrons in the outermost shell of an atom. They determine the chemical reactivity and bonding capacity of the element.
45
Which of these diseases is characterized by the swelling of the parotid (salivary) glands?
Answer:
Mumps
Mumps is a viral infection that primarily affects the salivary glands located near the ears. This results in the characteristic 'puffy cheeks' and swollen jaw that are the hallmark symptoms of the disease.
46
Which of the following is the most reactive halogen?
Answer:
Fluorine
Fluorine is the most reactive halogen because of its small size and very high electronegativity, which allows it to attract and gain electrons more vigorously than any other element.
47
In which block of the Periodic Table is Hydrogen placed?
Answer:
s-block
Hydrogen has the configuration $1s^1$, placing it in the s-block. However, because it shares properties with both Group 1 (one valence electron) and Group 17 (needs one electron to fill shell), its position is often debated.
48
According to the Kinetic Molecular Theory, the temperature of a gas is directly proportional to what?
Answer:
The average kinetic energy of the particles
Temperature is a measure of the average kinetic energy of the particles in a substance. As the temperature of a gas increases, the particles move faster, resulting in a higher average kinetic energy.
49
Which block elements are generally known as the 'Inner Transition Elements'?
Answer:
f-block
The f-block elements (Lanthanides and Actinides) are called inner transition elements because they are 'within' the transition metals of the d-block and involve the filling of the $(n-2)f$ subshells.
50
The elements that have the properties of both metals and non-metals are called:
Answer:
Metalloids
Metalloids lie along the 'staircase' line in the p-block and show a mix of metallic and non-metallic properties, often acting as semiconductors.