What is a natural radioactive substance ?

What is a natural radioactive substance ?
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Natural Radioactive Substances: In case of spontaneous emission of radioactive rays from any natural substance, those substances are called natural radioactive substances. For example, the radioactivity that occurs from elements like uranium , radium , thorium, etc. is natural radioactivity. The atomic number of these elements is more than 72.
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What is Radioactive Substance ?

Description : What is Radioactive Substance ?

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How does an atom of a radioactive substance know when it is to decay?

Description : How does an atom of a radioactive substance know when it is to decay?

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Radioactive substance has a constant activity of 2000 disintegrations per minute. The material is separated into two fractions, one of which has an in

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Description : If the amount of radioactive substance is increased three times, the number of atoms disintegrated per ubit time would :

Last Answer : If the amount of radioactive substance is increased three times, the number of atoms disintegrated per ubit ... 3)` rd of the original number of atoms

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If by mistake radioactive substance gets into human body, then from the point of view of radiation damage, the most harmful will be one that emits.

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The radiation from naturally occuring radioactive substance as seen after deflection by a magnetic field in one direction are :

Description : The radiation from naturally occuring radioactive substance as seen after deflection by a magnetic field in one direction are :

Last Answer : The radiation from naturally occuring radioactive substance as seen after deflection by a magnetic field in one ... D. either `alpha` or `beta`-rays

Radium is a radioactive substance. It dissolves in dilute `H_(2)SO_(4)` and forms a compound radium sulphate. The compound is a)No longer radioactive

Description : Radium is a radioactive substance. It dissolves in dilute `H_(2)SO_(4)` and forms a compound radium sulphate. The compound is a)No longer radioactive

Last Answer : Radium is a radioactive substance. It dissolves in dilute `H_(2)SO_(4)` and forms a compound ... content D. twice as radioactive as the radium content

When a radioactive substance is kept in a vessel, the atmosphere around it is rich with

Description : When a radioactive substance is kept in a vessel, the atmosphere around it is rich with

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The half - life of a radioactive substance depends upon (a) Its temperature (b) The external pressure (c) The mass of the substance (d) The strength of the nuclear force between the nucleons its atoms

Description : The half - life of a radioactive substance depends upon (a) Its temperature (b) The external pressure (c) The mass of the substance (d) The strength of the nuclear force between the nucleons its atoms

Last Answer : Ans:(d)

A radioactive substance does not undergo any change (in mass or charge) during – (1) ganuna-emission (2) oxidation (3) alpha-emission (4) beta-emission

Description : A radioactive substance does not undergo any change (in mass or charge) during – (1) ganuna-emission (2) oxidation (3) alpha-emission (4) beta-emission

Last Answer : (1) ganuna-emission Explanation: Gamma-rays do not carry any charge. These rays do not have any mass and hence can not be considered to be made up of particles.

A radioactive substance emits? (1) alpha particle (2) beta particle (3) gamma particle (4) all of the three

Description : A radioactive substance emits? (1) alpha particle (2) beta particle (3) gamma particle (4) all of the three

Last Answer : (4) all of the three Explanation: Radioactive substances are continually producing three kinds of dangerous radiation: alpha particles, beta particles and gamma rays. These types of radiation are invisible to the naked eye, and so you won't see a green glow.

What are Alpha rays emitted from a radioactive substance?

Description : What are Alpha rays emitted from a radioactive substance?

Last Answer : Helium nuclear

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Last Answer : (C) Deuterium atom has one proton and two neutrons in its nucleus

A radioactive substance does not emit (A) α-ray (B) Proton (C) Position (D) β-ray

Description : A radioactive substance does not emit (A) α-ray (B) Proton (C) Position (D) β-ray

Last Answer : (B) Proton

Emission of β-particles during radioactive decay of a substance is from (A) Innermost shell (B) Nucleus (C) Outermost shell (D) None of these

Description : Emission of β-particles during radioactive decay of a substance is from (A) Innermost shell (B) Nucleus (C) Outermost shell (D) None of these

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The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a GeigerMuller counter from its known quantity. If the half life period of aradioactive substance is one month, then(A) 3/4th of it will disintegrate in two months(B) It will completely disintegrate in two months(C) It will completely disintegrate in four months(D) 1/8th of it will remain intact at the end of four months

Description : The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a GeigerMuller counter from its known quantity. If the half life period of a ... in four months (D) 1/8th of it will remain intact at the end of four months

Last Answer : (B) It will completely disintegrate in two months

What naturally occurring radioactive substance present in indoor air is suspected as the second leading cause of lung cancer?

Description : What naturally occurring radioactive substance present in indoor air is suspected as the second leading cause of lung cancer? 

Last Answer : ANSWER: RADON 

A radioactive substance does not undergo any change (in mass or charge) during (1) gamma-emission (2) oxidation (3) alpha-emission (4) beta-emission

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The substance that is added to make natural rubber strong and more bouncy is – (1) Polythene (2) Sponge (3) Sulphur (4) Chlorine

Description : The substance that is added to make natural rubber strong and more bouncy is – (1) Polythene (2) Sponge (3) Sulphur (4) Chlorine

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Description : The substance that is added to make natural rubber strong and more bouncy is (1) Polythene (2) Sponge (3) Sulphur (4) Chlorine

Last Answer : Sulphur

What is a radioactive ray ? What is a radioactive ray ?

Description : What is a radioactive ray ? What is a radioactive ray ?

Last Answer : The continuous rays emitted from a radioactive substance are called radioactive rays.

Radioactive elements emit – (1) Radiowaves (2) Infrared waves (3) Ultraviolet waves (4) α, β and γ radiations

Description : Radioactive elements emit – (1) Radiowaves (2) Infrared waves (3) Ultraviolet waves (4) α, β and γ radiations

Last Answer : (4) α, β and γ radiations Explanation: The phenomenon of spontaneous emission of certain kinds of radiations by some elements is called radioactivity and the elements emitting such radiations are called ... the radioactive substances are separated in to three types, called a, b and g rays.

The depletion of Ozone layer is mainly due to – (1) Volcanic eruptions (2) Aviation fuels (3) Radioactive rays (4) Chlorofluorocarbons

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Which of the following caused radioactive pollution along the coast of Kerala? (1) Plutonium (2) Zinc (3) Thorium (4) Radium

Description : Which of the following caused radioactive pollution along the coast of Kerala? (1) Plutonium (2) Zinc (3) Thorium (4) Radium

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Chernobyl disaster is the result of pollution by – (1) Oil spill (2) Acid rain (3) Carbon dioxide (4) Radioactive waste

Description : Chernobyl disaster is the result of pollution by – (1) Oil spill (2) Acid rain (3) Carbon dioxide (4) Radioactive waste

Last Answer : (4) Radioactive waste Explanation: The Chernobyl disaster was a catastrophic nuclear accident that occurred on 26 April 1986 at the Chernobyl Nuclear Power Plant in the city of Pripyat, then ... radioactive particles into the atmosphere, which spread over much of the western USSR and Europe.

Which of the following is a radioactive element? (1) Cobalt (2) Uranium (3) Argon (4) Chromium

Description : Which of the following is a radioactive element? (1) Cobalt (2) Uranium (3) Argon (4) Chromium

Last Answer : (2) Uranium Explanation: Uranium (U) is a naturally occurring radioactive element. Its nucleus is unstable, so the element is in a constant state of decay, seeking a more stable arrangement ... fission reaction. In fact, uranium was the element that made the discovery of radioactivity possible.

The lightest radioactive element is - (1) deuterium (2) polonium (3) technetium (4) uranium

Description : The lightest radioactive element is - (1) deuterium (2) polonium (3) technetium (4) uranium

Last Answer : (3) Technetium Explanation: Tritium is a radioactive isotope of hydrogen. It is the lightest radioactive element.

Which of the following elements is not radioactive? (1) Radium (2) Plutonium (3) Zirconium (4) Uranium

Description : Which of the following elements is not radioactive? (1) Radium (2) Plutonium (3) Zirconium (4) Uranium

Last Answer : (3) Zirconium Explanation: Zireonium is a lustrous, greywhite, strong transition metal that resembles titanium. Zirconium is mainly used as a refractory and pacifier, although it is used in small amounts as an alloying agent for its strong resistance to corrosion.

Which one of the following is not a radioactive element? (1) Uranium (2) Thorium (3) Radium (4) Cadmium

Description : Which one of the following is not a radioactive element? (1) Uranium (2) Thorium (3) Radium (4) Cadmium

Last Answer : (4) Cadmium Explanation: Radioactivity refers to the particles which are emitted from nuclei as a result of nuclear instability. Because the nucleus experiences the intense conflict between the two ... show radioactive properties while the fourth one does not show any kind of radioactive properties.

The radioactive element used in heart pacemakers is – (1) Uranium (2) Deuterium (3) Plutonium (4) Radium

Description : The radioactive element used in heart pacemakers is – (1) Uranium (2) Deuterium (3) Plutonium (4) Radium

Last Answer : (1) Uranium Explanation: The actinides (or actinoids) are the chemical elements with atomic numbers between 90 and 109 inclusively. They occur between Groups 3 and 4 in Period 7 of the periodic table. ... scale, it is also used as a power source in smaller devices such as the heart pacemaker.

The radioactive isotope of hydrogen is called--------- and its nucleus contains --------proton and --- --neutron.

Description : The radioactive isotope of hydrogen is called--------- and its nucleus contains --------proton and --- --neutron.

Last Answer : Ans: Tritium, one and two

Which of the following is the same for both radioactive iodine and stable iodine? w) number of neutrons x) mass number y) half-life z) chemical properties

Description : Which of the following is the same for both radioactive iodine and stable iodine? w) number of neutrons x) mass number y) half-life z) chemical properties

Last Answer : ANSWER: Z -- CHEMICAL PROPERTIES

Radon differs from other naturally radioactive elements in which one of the following ways. Is it because radon w) is extremely radioactive x) decays into the element radium y) is a noble gas z) is as chemically active as fluorine

Description : Radon differs from other naturally radioactive elements in which one of the following ways. Is it because radon w) is extremely radioactive x) decays into the element radium y) is a noble gas z) is as chemically active as fluorine

Last Answer : ANSWER: Y -- IS A NOBLE GAS

Lead-206 is the final product of the radioactive decay series named the: w) thorium series x) actinium series y) uranium series z) neptunium series

Description : Lead-206 is the final product of the radioactive decay series named the: w) thorium series x) actinium series y) uranium series z) neptunium series

Last Answer : ANSWER: Y -- URANIUM SERIES 

Radioactive decay is a: w) zero-order process x) temperature-dependent process y) first-order process z) second-order process

Description : Radioactive decay is a: w) zero-order process x) temperature-dependent process y) first-order process z) second-order process

Last Answer : ANSWER: Y -- FIRST-ORDER PROCESS 

What naturally occurring radioactive element is so common in homes that testing for its presence is often advisable?

Description : What naturally occurring radioactive element is so common in homes that testing for its presence is often advisable? 

Last Answer : ANSWER: RADON

Who was awarded a Nobel Prize in 1911 for the discovery of the radioactive elements, radium and polonium?

Description : Who was awarded a Nobel Prize in 1911 for the discovery of the radioactive elements, radium and polonium?

Last Answer : ANSWER: D -- MARIE CURIE

Which of the following scientists was awarded the Nobel Prize in 1911 for the discovery of the radioactive elements, radium and polonium? w) John Dalton x) Dmitri Mendeleev y) Emil Fischer z) Marie Curie

Description : Which of the following scientists was awarded the Nobel Prize in 1911 for the discovery of the radioactive elements, radium and polonium? w) John Dalton x) Dmitri Mendeleev y) Emil Fischer z) Marie Curie

Last Answer : ANSWER: Z -- MARIE CURIE

Which of the following is a radioactive element? (1) Cobalt (2) Uranium (3) Argon (4) Chromium

Description : Which of the following is a radioactive element? (1) Cobalt (2) Uranium (3) Argon (4) Chromium

Last Answer : Uranium

Which of the following caused radioactive pollution along the coast of Kerala ? (1) Plutonium (2) Zinc (3) Thorium (4) Radium

Description : Which of the following caused radioactive pollution along the coast of Kerala ? (1) Plutonium (2) Zinc (3) Thorium (4) Radium

Last Answer : Thorium

Chernobyl disaster is the result of pollution by (1) Oil spill (2) Acid rain (3) Carbon dioxide (4) Radioactive waste

Description : Chernobyl disaster is the result of pollution by (1) Oil spill (2) Acid rain (3) Carbon dioxide (4) Radioactive waste

Last Answer : Radioactive waste

The depletion of Ozone layer is mainly due to (1) Volcanic eruptions (2) Aviation fuels (3) Radioactive rays (4) Chlorofluorocarbons

Description : The depletion of Ozone layer is mainly due to (1) Volcanic eruptions (2) Aviation fuels (3) Radioactive rays (4) Chlorofluorocarbons

Last Answer : Chlorofluorocarbons

The lightest radioactive element is (1) deuterium (2) polonium (3) tritium (4) uranium

Description : The lightest radioactive element is (1) deuterium (2) polonium (3) tritium (4) uranium

Last Answer : tritium