Which element has the most % in human body...? Mcqs

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Which element has the most % in human body...?

(A) Oxygen 65%
(B) Calcium 75%

(C) Hydrogen 10%
(D) Carbon 18%

✅ Correct Answer: Oxygen 65%

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Which element has the third most % in human body...?

(A) Oxygen 65%
(B) Calcium 75%

(C) Hydrogen 10%
(D) Carbon 18%

✅ Correct Answer: Hydrogen 10%

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The neutral atoms of all of the isotopes of the same element have _______...?

(A) Different numbers of protons
(B) Exact numbers of neutrons

(C) An exact number of protons
(D) An exact number of nucleons

✅ Correct Answer: An exact number of protons

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The two elements that are frequently used for making transistors are :...?

(A) Boron and aluminium
(B) Silicon and Germanium

(C) Iridium and Tungston
(D) None of these

✅ Correct Answer: Silicon and Germanium

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Which natural element has the highest melting point...?

(A) Iron
(B) Tungsten

(C) Copper
(D) Silver

✅ Correct Answer: Tungsten

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If an element B has five protons and six neutrons what will be the symbol of element B _____...?

(A) 115B
(B) 11B

(C) 115B
(D) None

✅ Correct Answer: 11B

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Isotopes of an element are identical in ____...?

(A) Mass number
(B) Electron number

(C) Valency
(D) Atomic number

✅ Correct Answer: Atomic number

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What is the element required for solar energy conversion ______...?

(A) Ultra pure carbon
(B) Silicon

(C) Beryllium
(D) Tantalum

✅ Correct Answer: Silicon

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The number shown below the symbol of element is called...?

(A) Mass Number
(B) Atomic Number

(C) Valance Number
(D) Atomic Mass

✅ Correct Answer: Atomic Mass

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How many elements are in modern periodic table...?

(A) 118
(B) 181

(C) 108
(D) 188

✅ Correct Answer: 118

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"A chemical compound always contains the same elements combined together in the same proportion or ratio" is the statement of ____...?

(A) Law of Multiple Proportions
(B) Law of Conservation of Mass

(C) Law of Reciprocal Proportions
(D) Law of Constant Composition

✅ Correct Answer: Law of Constant Composition

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According to Quark theory, there are _________ elementary particles....?

(A) Three
(B) Six

(C) Nine
(D) Ten

✅ Correct Answer: Six

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The study of rearing fine and intelligent human beings through genetics is called__________...?

(A) Eugenics
(B) Biotechnology

(C) Cloning
(D) Geneology

✅ Correct Answer: Eugenics

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If order and corresponding element of the matrices are same then matrices are said to be...?

(A) scalar
(B) diagonal

(C) equal
(D) rectangular

✅ Correct Answer: equal

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According to Mosely the chemical properties of elements are the periodic function of their...?

(A) Atomic Size
(B) Atomic Mass

(C) Atomic Radius
(D) Atomic Number

✅ Correct Answer: Atomic Number

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Heating element of an electric heater is made up of___________...?

(A) Tungsten
(B) Graphite

(C) Chromium
(D) Nichrome

✅ Correct Answer: Nichrome

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The elements in ecosystem recycle through organisms with environment is called ____...?

(A) Food chain
(B) Food web

(C) Chemical cycle
(D) Biogeochemical

✅ Correct Answer: Biogeochemical

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The heaviest man made element found so for is__________...?

(A) Promethium
(B) Ununoctium

(C) Francium
(D) Technetium

✅ Correct Answer: Ununoctium

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A radioactive element emits a particle from the nucleus of one of its atoms. The particle comprises two protons and two neutrons. The name of this process is called...?

(A) α-emission
(B) β-emission

(C) γ-emission
(D) Nuclear fission

✅ Correct Answer: α-emission

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Elements are made of _________...?

(A) Atoms
(B) Molecules

(C) H2O
(D) Compounds

✅ Correct Answer: Atoms

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An atom of an element has 11 protons, 11 electrons and 12 neutrons. The atomic mass of an atom is...?

(A) 11
(B) 12

(C) 22
(D) 23

✅ Correct Answer: 23

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The most abundant element in human body is __________...?

(A) Hydrogen
(B) Blood

(C) Oxygen
(D) Protein

✅ Correct Answer: Oxygen

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How many teeth are there in human mouth...?

(A) 30
(B) 33

(C) 32
(D) 31

✅ Correct Answer: 32

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Which of the following circuit elements is used to ‘block’ DC in an electronic circuit ...?

(A) Resistances
(B) Capacitance

(C) Inductance
(D) Diode

✅ Correct Answer: Capacitance

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Which of the following vitamins promote healthy functioning of eyes in human beings...?

(A) Vitamin B
(B) Vitamin C

(C) Vitamin A
(D) Vitamin D

✅ Correct Answer: Vitamin A

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Which is the most electro-negative element among the following _________...?

(A) Fluorine
(B) Bromine

(C) Sodium
(D) Oxygen

✅ Correct Answer: Fluorine

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Which element is called earth maker...?

(A) Oxygen
(B) Silicon

(C) Carbon
(D) Hydrogen

✅ Correct Answer: Silicon

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Pollutants that are introduced into the environment by human activity are called as ___________...?

(A) Qualitative pollutants
(B) Quantitative pollutants

(C) Anthropogenic pollutant
(D) All of Above

✅ Correct Answer: Anthropogenic pollutant

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The number shown above the symbol of element is called...?

(A) Mass Number
(B) Valency

(C) Atomic Number
(D) Oxidation State

✅ Correct Answer: Atomic Number

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Fertilizers are substances containing chemical elements such as manure or mixture of ______...?

(A) Lipids
(B) Carbohydrates

(C) Nitrates
(D) Proteins

✅ Correct Answer: Nitrates

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Deficiency of Vitamin __________ causes Sailors Disease in human...?

(A) Vitamin A
(B) Vitamin K

(C) Vitamin C
(D) Vitamin D

✅ Correct Answer: Vitamin C

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The three elements needed for healthy growth of plants are __________...?

(A) N, P, K
(B) N, C, P

(C) N, K,
(D) N, S, P

✅ Correct Answer: N, P, K

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The most abundant element in the universe is __________....?

(A) Oxygen
(B) Hydrogen

(C) Carbon Dioxide
(D) Silicon

✅ Correct Answer: Hydrogen

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All Transition Elements are _____...?

(A) Gases
(B) Metals

(C) Nonmetals
(D) Metalloids

✅ Correct Answer: Metals

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Which of the following elements is not present abundantly in earth’s crust ...?

(A) Silicon
(B) Radium

(C) Aluminum
(D) Carbon

✅ Correct Answer: Radium

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A (an) ________ is the smallest possible particle of an element that can combine to form new compounds....?

(A) Molecule
(B) Atom

(C) Compound
(D) Element

✅ Correct Answer: Atom

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The element common to all acids is:__________...?

(A) Hydrogen
(B) Carbon

(C) Sulphur
(D) Oxygen

✅ Correct Answer: Hydrogen

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Animals, plants, human beings and microorganisms etc is/are an examples of...?

(A) Living Components
(B) Biotic Factors

(C) Both A and B
(D) Abiotic Factors

✅ Correct Answer: Both A and B

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The atoms of same element which have the same atomic number but different mass numbers are known as...?

(A) Isotopes
(B) Isoelectronic

(C) Isomers
(D) Isobars

✅ Correct Answer: Isotopes

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What is the first element in the periodic table...?

(A) Hydrogen
(B) Helium

(C) Nitrogen
(D) Carbon

✅ Correct Answer: Hydrogen

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Bio elements considered as vital for life are ______ members or in numbers....?

(A) 13
(B) 12

(C) 14
(D) 16

✅ Correct Answer: 16

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The most abundant element in the Earth’s crust is __________...?

(A) Oxygen
(B) Hydrogen

(C) Carbon Dioxide
(D) Silicon

✅ Correct Answer: Oxygen

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The ‘stone’ formed in human kidney consist mostly of_____________...?

(A) Calcium oxalate
(B) Sodium acetate

(C) Magnesium sulphate
(D) Calcium

✅ Correct Answer: Calcium oxalate

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The main culprit of greenhouse effect is Carbon dioxide. But which is the second element contributing most to greenhouse effect...?

(A) Nitrogen Dioxide (NO2)
(B) Chlorofluorocarbons (CFCs)

(C) Methane (CH4)
(D) High-fructose corn syrup (HFCs)

✅ Correct Answer: Methane (CH4)

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Which among the following is correct about Saliva of a Healthy Human...?

(A) It is slightly acidic
(B) It is slightly saline

(C) It is slightly alkaline
(D) It is neutral

✅ Correct Answer: It is slightly alkaline

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In whole Periodic Table which element Is Most Reducing Agent ...?

(A) Chlorine
(B) lithium

(C) Helium
(D) Neon

✅ Correct Answer: lithium

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The element used in lead pencils is__________...?

(A) Zinc
(B) Lead

(C) Carbon
(D) Tin

✅ Correct Answer: Carbon

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Alzheimer’s disease in human beings is characterized by the degeneration of _______...?

(A) Kidney cells
(B) Nerve cells

(C) Liver cells
(D) Spleen cells

✅ Correct Answer: Nerve cells

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An element that does not occur in nature but can be produced artificially is__________...?

(A) Plutonium
(B) Uranium

(C) Radium
(D) Thorium

✅ Correct Answer: Plutonium

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An area of microbiology that is concerned with the occurence of disease in human population is...?

(A) Immunology
(B) Paracitology

(C) Epidemiology
(D) none

✅ Correct Answer: Epidemiology

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Which element is used as moderator in nuclear reactor...?

(A) Light water
(B) Dense water

(C) Fresh water
(D) Heavy water

✅ Correct Answer: Heavy water

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Elements which have same number of protons but different number of neutrons are called as _________ ...?

(A) Isotopes
(B) Isomers

(C) Allotropes
(D) Allomers

✅ Correct Answer: Isotopes

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The process in which nuclei of heavy elements are broken into lighter nuclei and produce a large amount of heat energy is called...?

(A) Fusion
(B) Geometry

(C) Regales
(D) Fission

✅ Correct Answer: Fission

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Which one of the following elements the drum of a Photostat machine is made up of: _________...?

(A) Aluminium
(B) Selenium

(C) Barium
(D) None of these

✅ Correct Answer: Selenium

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Which element has the second most % in human body...?

(A) Oxygen 65%
(B) Calcium 75%

(C) Hydrogen 10%
(D) Carbon 18%

✅ Correct Answer: Carbon 18%

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Nuclear radiation is emitted by those elements whose:...?

(A) molecules are stable
(B) molecules are unstable

(C) nuclei are stable
(D) nuclei are unstable

✅ Correct Answer: nuclei are unstable

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Which are the only two elements on the periodic table that are liquid at room temperature...?

(A) Mercury and Bromine
(B) Carbon and helium

(C) Nitrogen and Hydrogen
(D) Oxygen and Neon

✅ Correct Answer: Mercury and Bromine

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The most abundant element in sea water is...?

(A) Chlorine
(B) Sodium

(C) Sulfur
(D) Magnesium

✅ Correct Answer: Chlorine

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Element extracted from Sea water...?

(A) Beryllium
(B) Magnesium

(C) Aluminium
(D) None of These

✅ Correct Answer: Magnesium

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The property decides the order of elements in the modern periodic table is ____...?

(A) The number of neutrons in the nucleus
(B) The number of electrons in the outermost shell

(C) The number of protons (atomic number) in the nucleus
(D) The atomic mass of the element

✅ Correct Answer: The number of protons (atomic number) in the nucleus

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Which is the most abundant element in the atmosphere...?

(A) Nitrogen
(B) Hydrogen

(C) Nickle
(D) Oxygen

✅ Correct Answer: Nitrogen

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Vertical columns in the periodic table of elements are called as__________...?

(A) Periods
(B) Groups

(C) Rows
(D) Lanthanoids series

✅ Correct Answer: Groups

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In periodic table elements are arranged according to ____...?

(A) Increasing atomic mass
(B) Decreasing atomic number

(C) Both A and B
(D) Increasing in atomic number

✅ Correct Answer: Increasing in atomic number

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The Latin word of the name given to a human being Homo Sapiens, include the: __________...?

(A) Genus & Family
(B) Family & Order

(C) Genus & Class
(D) Genus & Species

✅ Correct Answer: Genus & Species

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Isotopes of an element have the same number of _______...?

(A) Neutrons
(B) Protons

(C) Electrons
(D) Beta rays

✅ Correct Answer: Protons

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The position of an element in the Periodic Table is determined by its __________ number...?

(A) Electron
(B) Proton

(C) Neutron
(D) None of these

✅ Correct Answer: Proton

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How many muscles in human body...?

(A) 632
(B) 639

(C) 642
(D) None of these

✅ Correct Answer: 639

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Which of following is not a digestive enzyme in human body...?

(A) Pepsin
(B) Trypsin

(C) Gastrin
(D) Ptyalin

✅ Correct Answer: Gastrin

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