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Scientists & Inventions Part-2

📆 October 19, 2024

Total Questions: 30

1. Who of the following scientists proved that the stars with mass less than 1.44 times the mass of the sun end up as White Dwarfs when they die? [I.A.S. (Pre) 2009]

Correct Answer: (b) S. Chandra Shekhar
Solution:S. Chandrasekhar proved that the stars with mass less than 1.44 times the mass of the sun end up as white dwarfs when they die. He showed that the mass of a white dwarf could not exceed 1.44 times that of the sun.

2. The photoelectric effect was discovered by: [U.P.P.C.S. (Mains) 2003]

Correct Answer: (a) Hertz
Solution:The photoelectric effect is a phenomenon in which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation. The effect is often defined as the emission of electrons from a metal plate when light falls on it. This effect was discovered in 1887 by the German physicist Heinrich Rudolf Hertz. This is also known as the Hertz effect.

3. Scientist Albert Einstein is famous for: [38th B.P.S.C. (Pre) 1992]

Correct Answer: (b) The photoelectric effect
Solution:Scientist Albert Einstein is famous for providing a simple and factual explanation of the Photoelectric effect on the basis of Planck's quantum theory. For this, he was awarded the Nobel Prize in Physics in 1921.

4. Einstein was awarded the Nobel Prize for: [U.P.P.C.S. (Pre) 2015]

Correct Answer: (c) Photoelectric effect
Solution:Scientist Albert Einstein is famous for providing a simple and factual explanation of the Photoelectric effect on the basis of Planck's quantum theory. For this, he was awarded the Nobel Prize in Physics in 1921.

5. Einstein was honoured with the Nobel Prize for: [U.P. P.C.S. (Pre) 2016, U.P. Lower Sub. (Pre) 2015]

Correct Answer: (a) Photoelectric Effect
Solution:Scientist Albert Einstein is famous for providing a simple and factual explanation of the Photoelectric effect on the basis of Planck's quantum theory. For this, he was awarded the Nobel Prize in Physics in 1921.

6. Einstein was awarded the Nobel Prize for which of his theories? [U.P. P.C.S. (Pre) 2018]

Correct Answer: (b) Theory of photoelectricity
Solution:Scientist Albert Einstein is famous for providing a simple and factual explanation of the Photoelectric effect on the basis of Planck's quantum theory. For this, he was awarded the Nobel Prize in Physics in 1921.

7. Einstein got the Nobel Prize for: [64th B.P.S.C. (Pre) 2018]

Correct Answer: (d) Photoelectric effect
Solution:Scientist Albert Einstein is famous for providing a simple and factual explanation of the Photoelectric effect on the basis of Planck's quantum theory. For this, he was awarded the Nobel Prize in Physics in 1921.

8. The 'theory of relativity' is presented by which scientist? [67th B.P.S.C. (Pre) (Re. Exam) 2022]

Correct Answer: (a) Albert Einstein
Solution:Special relativity and general relativity, proposed and published in 1905 and 1915, respectively. Special relativity applies to all physical phenomena in the absence of gravity. Special relativity argued that space and time are inextricably connected, but it did not acknowledge the existence of gravity. General relativity explains the law of gravitation and its relation to the forces of nature. General relativity is Einstein's understanding of how gravity affects the fabric of space-time. It applies to the cosmological and astrophysical realms, including astronomy.

9. In Einstein's equation, E = mc², c denotes — [Uttarakhand P.C.S. (Pre) 2007]

Correct Answer: (b) Speed of light
Solution:Einstein's equation shows that mass is equivalent to energy, whether it might be in any form. According to Einstein's formula:
E = mc²
where

E = Energy

m = mass

c = speed of light.

10. Albert Einstein was proficient in playing which musical instrument? [Uttarakhand P.C.S. (Pre) 2007]

Correct Answer: (c) Violin
Solution:Albert Einstein was proficient in playing the violin and piano.
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