FSC Physics MCQs Chapter 21 Class 12


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Physics Ch 21 Class 12 Nuclear Physics

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If u and d represent up quark and down quark respectively then composition of Proton and Neutron can be written as:

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The binding per nucleon of deuteron (21H) and helium nucleus (42He) are 1.1 MeV and 7 MeV respectively. If two deuterons merge to form a single helium nucleus, the energy released will be:

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Which of the following gives the correct expression of Decay Constant?

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Which of the following consist of two quarks? a

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Which of the following can cause least Ionization but has high Penetrating Power?

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The lightest element which exhibits radioactivity is:

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Beta particles are the particles emitted from the _____ of an atom.

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There are leptons

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When we measure the nuclear masses and compare them with the masses of the constituent nucleus in free states, the mass of the nucleus is always less than the mass of the constituent nucleons. The difference in mass is known as:

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In Nuclear Physics the mass defect is referred to _______.

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_______ is also known as anti-electron.

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Why is the total mass of all individual protons and neutrons in a nucleus greater than the mass of the nucleus which they constitute?

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Species of the same element that have the same atomic number “Z” but have different mass number “A” are called ____ of that element.

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Which gas is not used in GM counter?

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A body of mass of 2kg absorbed 10 J of radioactive radiations. The absorbed dose of radiation in rad is:

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A material that does NOT become radioactive after absorbing neutrons is called.

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What is correct about alpha and x rays?

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During the process of nuclear disintegration, when alpha particle emission occurs, atomic no. of the atom changes by _____ and its mass number changes by _____.

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Which of the following is the pair of isobars?

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The detection and estimation of an element in a mixture is sometimes nearly impossible, if it is present in very minute traces or if it’s chemical properties are very similar to those of other elements in the mixture. An effective technique is developed for these purposes is known as?

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Fusion and fission reactions are associated with:

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During radioactive decay of a nucleus zXA, β emission takes place along with the daughter nucleus. Because of this beta particle emission, the mass number (A) of the parent nucleus:

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While using radiation therapy, cancerous thyroid is treated with ____ radioisotope:

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Half-life of iodine-131 is 8 days. If 20mg is present initially. How much iodine is left behind after 2 half-lives?

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Transmutation occurs when rays are given out:

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Muon has charge of?

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Disintegration of a radioactive element is

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Alpha particle has

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Let X be a radioactive element having No nuclei. The time required to decay this element to one half of its initial number No is known as:

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There are initially 400 atoms in a radioactive sample. What would be the number of atoms after 3 half – life?

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A lithium nucleus contains 3 protons and 4 neutrons. What is its atomic number?

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Radioactive elements emit:

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Which of the following Is not true about radioactivity?

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Which of the following have low ionization and high penetrating power?

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Penetration power of gamma rays as compared to alpha rays is

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A nucleus weighs less than Its sum of nucleons, a quantity known as the

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Alpha rays are nuclear radiations. They are in fact same as _____ nuclei.

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Emission of an alpha particle from a radioactive element.

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Which one of these is used in the treatment of Cancer?

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The process of natural decay of some heavy nuclides is because of the phenomenon:

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The half-life of C14 is approximately 5,730 years, while the half-life of C12 is essentially infinite. If the ratio of C14 to C12 in a certain sample is 25% less than the normal ratio in nature, how old is the sample?

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In which of the following the pn Junction is used?

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Charge on an up-quark is:

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How many neutrons are released during fusion of two deuterons?

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Which of the following radiation detector operates under Reverse Bias?

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Radiation cause damage in a)

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The half-life of a radioactive element depends upon:

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A nucleus consists of 11 protons and 12 neutrons. The conventional symbol of nucleus is:

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Sodium nucleus consists of 11 protons and 12 neutrons. The conventional symbol of this nucleus is?

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Alpha, Beta, and Gamma radiations are emitted from a radioactive substance:

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Which of the following is the percentage of the original quantity of a radioactive material left after five half–lives approximately.

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The half-life of Iodine Is

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Gamma rays are emitted from nuclei of radioactive atoms. They are nothing but:

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Which of the following has greater speed In space?

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To remove the huge amount of heat energy in a nuclear reactor, ______ is/are used.

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) Which can damage eye?

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4.5 x 109 years is the half-life of:

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If half-life of an element Is 4 minutes, then 3/4′ of It Is decayed in:

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Which of the following affects our eye?

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A factory buys 100 kg of a radioactive chemical with a half-life of 5 years which decays to a stable compound. How much of the chemical will still be radioactive in 10 years time.

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Nuclear fission reaction takes place In controlled conditions by the

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Nucleus with an excess of neutrons may decay radioactivity with the emission of:

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An alpha particle is ejected from the nucleus of an atom. Which of the following answers describes the change in the nucleus of the atom?

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Which of the following will be absorbed by the paper?

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During the process of nuclear disintegration, when beta particle emission occurs, atomic no. of the atom changes by _____ and the mass number changes by ______.

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How many quarks neutron and proton is made up of?

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The chemical properties of elements depend on ________.

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Radiation can cause:

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An element whose atomic number is same but mass number is different is called:

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Human body emits which of the following radiation?

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The half-life of C14 is about:

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Particles which can be added to the nucleus of an atom without changing its chemical properties are:

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In heavy nuclei the number of neutrons is than protons

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In Nuclear reactions, we have the conservation of:

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Which of the following is an instrument for monitoring radiations:

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Which of the following has highest ionizing power and least penetrating power?

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Energy of fast moving neutron Is?

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Meson consists of:

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What’s relation between penetrating power and Ionization power

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