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Question 1062

Usually OMR sheets are used in most of the competitive examinations. The full form of OMR is :

AOptical Mark Response

BOptical and Magnetic Reader

COptical and Magnetic Record

DOptical Mark Recognition

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D. Optical Mark RecognitionExplanation: The full form of OMR is Optical Mark Recognition. It is a technology used to detect marks made on specially designed paper forms, such as answer sheets in competitive exams or surveys. Candidates mark their answers by filling bubbles with dark ink or pencil, and the OMR scanner reads these marks by detecting reflected light. This process allows for fast, accurate, and automated data collection without manual checking, minimizing human errors and saving time.

Question 1061

Normally, the substances that fight against diseases in human body are known as :

AAntibodies

BDeoxyribo nucleic acid

CRibo nucleic acid

DEnzymes

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A. AntibodiesExplanation: Antibodies (also called immunoglobulins) are specialized proteins produced by B-lymphocytes (a type of white blood cell) in response to the presence of foreign substances known as antigens (such as bacteria, viruses, or toxins). These antibodies recognize and bind specifically to the antigens to neutralize or destroy them, helping the body fight infections and build immunity. Antibodies are a vital part of the immune system and form the basis for vaccines and disease resistance.

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 1034

Which kind of lens is used in microscope ?

AConvex

BConcave

CBiconvex and concave

DBiconcave

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A. ConvexExplanation: A microscope uses a system of convex lenses to magnify very small objects. Convex lenses, also known as converging lenses, bend light rays inward to a focal point, creating an enlarged and clear image of the specimen. A compound microscope typically contains two sets of convex lenses — the objective lens (near the specimen) and the eyepiece lens (near the observer’s eye). The objective lens forms a real, inverted, and magnified image, which is then further magnified by the eyepiece to produce a large virtual image.

Question 1028

Consider the following diseases: i)Cholera ii)Tuberculosis iii)Small pox iv)Typhoid Which of the above diseases are caused by bacteria ?

A(i) and (iii) only

B(ii) and (iv) only

C(i), (iii) and (iv)

D(i), (ii) and (iv)

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D. (i), (ii) and (iv)Explanation: The diseases Cholera, Tuberculosis, and Typhoid are all caused by bacteria, whereas Smallpox is caused by a virus (Variola virus). Bacterial diseases are typically treated with antibiotics, while viral diseases require vaccines or antiviral drugs. Cholera spreads through contaminated water, Typhoid through food and water, and Tuberculosis through droplets from infected individuals.

Question 1027

Threat of 'global warming' is increasing due to increasing concentration in the atmosphere of:

AO3

BCO2

CSO2

DNO2

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B. CO2Explanation: The major cause of global warming is the increasing concentration of carbon dioxide (CO₂) in the atmosphere. CO₂ is a greenhouse gas that traps heat radiating from the Earth's surface, preventing it from escaping into space — a phenomenon known as the greenhouse effect. Human activities such as the burning of fossil fuels, deforestation, and industrial emissions have significantly increased CO₂ levels, leading to a rise in the Earth’s average temperature, melting of glaciers, rising sea levels, and climate change.

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Science

Usually OMR sheets are used in most of the competitive examinations. The full form of OMR is :

Normally, the substances that fight against diseases in human body are known as :

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 :

Which kind of lens is used in microscope ?

Consider the following diseases: i)Cholera ii)Tuberculosis iii)Small pox iv)Typhoid Which of the above diseases are caused by bacteria ?

Threat of 'global warming' is increasing due to increasing concentration in the atmosphere of:

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