Physical World - Online Test

Q1. One example where science predates technology is
Answer : Option B
Explaination / Solution:

The idea of wireless communication predates the discovery of "radio" with experiments in "wireless telegraphy" via inductive and capacitive induction and transmission through the ground, water, and even train tracks from the 1830s on. James Clerk Maxwell showed in theoretical and mathematical form in 1864 that electromagnetic waves could propagate through free space. Over several years starting in 1894 the Italian inventor Guglielmo Marconi built the first complete, commercially successful wireless telegraphy system

Q2. The major contribution of C.V. Raman was
Answer : Option A
Explaination / Solution:

The Indian physicist C.V. Raman helped the growth of science in his country. He received the Nobel Prize for Physics in 1930 for the discovery that when light passes through a transparent material, some of the light changes in wavelength. This phenomenon is now called Raman scattering.

Q3. The major contribution of M.N. Saha was
Answer : Option C
Explaination / Solution:

Meghnad Saha was an eminent Indian astrophysicist who gave the world the theory of ionization which explained the origin of stellar spectra.

Q4. The major contribution of S.N. Bose was in
Answer : Option D
Explaination / Solution:

Satyendra Nath Bose was an Indian physicist from Bengal specialising in theoretical physics. He is best known for his work on quantum mechanics in the early 1920s, providing the foundation for Bose–Einstein statistics and the theory of the Bose–Einstein condensate.

Q5. Albert Einstein was awarded the Nobel Prize for his work on
Answer : Option A
Explaination / Solution:

The Nobel Prize in Physics 1921 was awarded to Albert Einstein "for his services to Theoretical Physics, and especially for his discovery of the law of the photoelectric effect". Albert Einstein received his Nobel Prize one year later, in 1922.

Q6. The major contribution of Paul Dirac was in
Answer : Option D
Explaination / Solution:

Paul Dirac was one of the greatest theoretical physicists in history. He completely reshaped quantum mechanics with the astounding Dirac Equation. The Dirac Equation explained the behavior of electrons and foretold the existence of antimatter. Dirac was also able to infer the existence of vacuum polarization, revealing that what we once believed was empty space is actually awash with short-lived particle-antiparticle pairs.

Q7. Fundamental forces in nature are those
Answer : Option A
Explaination / Solution:

The universe has a lot of forces, a lot of pushes and pulls. We're always pushing or pulling something, even if only the ground. But it turns out that in physics, there are really only four fundamental forces from which everything else is derived: the strong force, the weak force, the electromagnetic force, and the gravitational force.

Q8. Which of these is not a fundamental force?
Answer : Option B
Explaination / Solution:

There are four conventionally accepted fundamental interactions—gravitational, electromagnetic, strong, and weak. Each one is described mathematically as a field.

Q9. Strong Nuclear Force
Answer : Option A
Explaination / Solution:

The strong nuclear force is the nuclear binding force, the force that provides the attraction.it might also be responsible for holding particles together within the nucleus of atoms.

Q10. In the event of your stumbling upon a discovery, which has great academic interest but is certain to have nothing but dangerous consequences for the human society. How, if at all, will you resolve your dilemma?
Answer : Option A
Explaination / Solution:

If an invention that only cause harm to the society, it should be in safe hands only and the safe hands are only who discovered it. So it's better to keep the information upto you and your colleagues, so that all of them can work on it to make it useful for society.