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
Pasteurization is a process used to make milk safe to drink. What does this process involve?
Answer:
Heating the milk to a specific temperature for a short time
Pasteurization involves heating liquids (like milk or juice) to a temperature high enough to kill most harmful pathogens (like Salmonella or E. coli) without significantly changing the taste or nutritional value of the food.
42
Which of the following is a common symptom of a 'Tetanus' infection?
Answer:
Lockjaw and muscle spasms
Tetanus toxin interferes with the nerves that control muscles. One of the first and most common symptoms is 'lockjaw' (trismus), where the jaw muscles become so stiff that the person cannot open their mouth or swallow.
43
What is the term for the energy required to remove an electron from a gaseous atom?
Answer:
Ionization energy
Ionization energy is the minimum amount of energy needed to remove the most loosely bound electron from an isolated neutral gaseous atom. It generally increases across a period and decreases down a group.
44
Which microorganism is responsible for 'Pneumonia', an infection that inflames the air sacs in one or both lungs?
Answer:
Bacteria, viruses, or even fungi
Pneumonia is a general term for lung inflammation with fluid. It can be caused by various pathogens, including bacteria (like Streptococcus pneumoniae), viruses (like Influenza or RSV), and sometimes fungi in people with weak immune systems.
45
What is 'Passive Immunity'?
Answer:
Immunity provided by the injection of pre-formed antibodies
Passive immunity involves giving a person antibodies that were produced by another person or animal. It provides immediate protection but is temporary because the person's own immune system didn't learn how to make the antibodies themselves. Example: antibodies passed from mother to baby.
46
Which of the following is a classic symptom of 'Malaria'?
Answer:
Recurring high fever with chills and sweating
Malaria is known for its 'paroxysms'—cycles of intense cold (shivering/chills), followed by high fever, and finally intense sweating as the fever breaks. These cycles correspond to the parasite bursting out of red blood cells.
47
The total number of protons and neutrons in an atom is known as the:
Answer:
Mass number
The mass number ($A$) is the sum of the number of protons ($Z$) and the number of neutrons ($N$) in the nucleus. It represents the approximate mass of the atom in atomic mass units (amu).
48
In the Bohr model of the atom, electrons move in:
Answer:
Fixed circular orbits
Niels Bohr proposed that electrons circle the nucleus in prescribed orbits of fixed energy. Electrons can jump between these levels by absorbing or emitting specific amounts of energy (quanta).
49
Which subatomic particle carries a negative electric charge?
Answer:
Electron
Electrons are subatomic particles with a negative elementary charge. They orbit the nucleus of an atom in specific energy levels or shells and are involved in chemical bonding and electricity.
50
Which of the following is true for a neutral atom of Carbon-14?
Answer:
It has 6 protons and 8 neutrons
Carbon always has an atomic number of 6 (6 protons). In Carbon-14, the mass number is 14. Therefore, the number of neutrons is $14 - 6 = 8$.