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Question 1060

The day and night are equal on September :

A21

B23

C25

D27

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B. 23Explanation not yet available.

Question 1059

Cobalt-60, commonly used in radiation therapy, emits :

AAlpha rays

BBeta rays

CGamma rays

DX-rays

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C. Gamma raysExplanation: Cobalt-60 (Co-60) is a radioactive isotope of cobalt that emits high-energy gamma rays during its decay process. It decays into Nickel-60 (Ni-60) by beta decay, releasing two strong gamma photons of energies 1.17 MeV and 1.33 MeV. Due to these intense gamma emissions, Co-60 is widely used in radiation therapy (teletherapy) for cancer treatment, as well as in industrial radiography and sterilization of medical equipment. Gamma rays have high penetration power, allowing them to destroy cancerous cells deep inside tissues.

Question 1058

Einstein received Nobel Prize for his theory of :

ARelativity

BPhotoelectricity

CBrownian Motion

DNone of these

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B. PhotoelectricityExplanation: Albert Einstein received the Nobel Prize in Physics in 1921 for his discovery of the photoelectric effect, not for his famous theory of relativity. In the photoelectric effect, when light of a certain frequency falls on a metal surface, it emits electrons. Einstein explained this phenomenon by proposing that light is made up of discrete packets of energy called photons. The energy of each photon is given by E = hν, where h is Planck’s constant and ν is the frequency of light. This discovery laid the foundation for quantum physics and modern electronics.

Question 1057

The science dealing with the study of phenomena at very low temperature is known as :

ARefrigenics

BCryogenics

CCytogenics

DFrozenics

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B. CryogenicsExplanation: The branch of science that deals with the study of the production, behavior, and effects of materials at very low temperatures is called Cryogenics. The word comes from the Greek words “kryos” meaning cold and “gen” meaning to produce. Cryogenics involves cooling substances to temperatures below −150°C (123 K). It has applications in liquefying gases (like oxygen and nitrogen), cryopreservation of biological samples, superconductivity research, and rocket fuel storage (e.g., liquid hydrogen and oxygen).

Question 1056

The process by which energy is generated in the Sun is :

ANuclear fusion

BNuclear fission

CBoth nuclear fusion and nuclear fission

DThe burning of gases

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A. Nuclear fusionExplanation: The Sun produces its enormous energy through the process of nuclear fusion. In this process, hydrogen nuclei (protons) combine under extremely high temperature and pressure to form helium, releasing a tremendous amount of energy in the form of light and heat. The main fusion reaction in the Sun is the proton–proton chain. Unlike fission (splitting of nuclei), fusion combines light nuclei, and this is what powers all stars, including the Sun.

Question 1055

The number of protons in an alpha particle is :

Aone

Btwo

Cthree

Dfour

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B. twoExplanation: An alpha particle (α-particle) is a positively charged particle that consists of two protons and two neutrons, the same as the nucleus of a helium atom (He²⁺). It carries a +2 charge because of the two protons and has a mass number of 4. Alpha particles are emitted during the radioactive decay of heavy elements such as uranium, radium, and thorium. They have high ionizing power but low penetration ability and can be stopped by a sheet of paper or human skin.

Question 1054

In Roman numerals 100 is written as :

AX X X X X

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D. CExplanation not yet available.

Question 1053

River Don is in :

AEngland

BRussia

CGermany

DSpain

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B. RussiaExplanation not yet available.

Question 1052

Bengal Chemical and Pharmaceuticals Ltd, a public sector undertaking of the Govt. of India, was established in 1901 during Swadeshi movements, by :

APrafulla Chandra Roy

BRabindranath Tagore

CJagadish Chandra Basu

DSurendra Nath Banerjee

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A. Prafulla Chandra RoyExplanation not yet available.

Question 1051

The first T.V channel in the world that provided 24 hour news broadcast is :

ACNN

BBBC

CNDTV 24x7

DNone of the above

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A. CNNCNN full form: Cable News Network

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Explore the question bank

The day and night are equal on September :

Cobalt-60, commonly used in radiation therapy, emits :

Einstein received Nobel Prize for his theory of :

The science dealing with the study of phenomena at very low temperature is known as :

The process by which energy is generated in the Sun is :

The number of protons in an alpha particle is :

In Roman numerals 100 is written as :

River Don is in :

Bengal Chemical and Pharmaceuticals Ltd, a public sector undertaking of the Govt. of India, was established in 1901 during Swadeshi movements, by :

The first T.V channel in the world that provided 24 hour news broadcast is :

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