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
21
An atom that has lost one or more electrons is called a/an:
Answer:
Cation
Cations are positively charged ions formed when an atom loses electrons. Since there are now more protons than electrons, the net charge is positive.
22
Which of the following scientists first proposed that matter is made of tiny, indivisible particles called 'atoms'?
Answer:
Democritus
Democritus, an Ancient Greek philosopher, first used the term 'atomos' (meaning indivisible) to describe the fundamental building blocks of matter.
23
Which element has the electron configuration $2, 8, 1$?
Answer:
Sodium
The total number of electrons is $2 + 8 + 1 = 11$. The element with atomic number 11 is Sodium (Na).
24
What happens to the volume of a fixed mass of gas if the pressure is doubled at constant temperature (Boyle's Law)?
Answer:
It is halved
Boyle's Law states that pressure and volume are inversely proportional ($P imes V = k$). If the pressure is doubled, the volume must be reduced by half to maintain the constant value.
25
Athlete's foot is a contagious infection that usually affects the skin on the feet. How is it most commonly spread?
Answer:
By walking barefoot in damp public areas like locker rooms
Athlete's foot is caused by fungi that thrive in warm, moist environments. People often contract it by coming into contact with contaminated floors in showers, swimming pools, or locker rooms where the fungus is present.
26
Which of these is a preventive measure specifically for 'Tuberculosis'?
Answer:
Improving ventilation and avoiding close contact with coughing individuals
Because TB is spread through the air via respiratory droplets, maintaining good air circulation (ventilation) helps disperse the bacteria. Avoiding close, prolonged contact with people who have active TB is also crucial to prevent inhalation of the pathogen.
27
Diffusion occurs fastest in which state of matter?
Answer:
Gas
Diffusion is faster in gases because gas particles have high kinetic energy and are separated by large distances, allowing them to move quickly and mix with other particles with minimal resistance.
28
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.
29
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.
30
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.