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question_answer1) Assertion : It is not possible to use \[^{35}Cl\]as the fuel for fusion energy. Reason : The binding energy of \[^{35}Cl\]is too small. [AIIMS 2005]
question_answer2) Assertion : \[^{90}Sr\] from the radioactive fall out from a nuclear bomb ends up in the bones of human beings through the milk consumed by them. It causes impairment of the production of red blood cells. Reason : The energetics b-particles emitted in the decay of \[^{90}Sr\] damage the bone marrow. [AIIMS 2004]
question_answer3) Assertion : Neutrons penetrate matter more readily as compared to protons. Reason : Neutrons are slightly more massive than protons. [AIIMS 2003]
question_answer4) Assertion : Bohr had to postulate that the electrons in stationary orbits around the nucleus do not radiate. Reason : According to classical physics all moving electrons radiate. [AIIMS 2003]
question_answer5) Assertion : Radioactive nuclei emit \[{{\beta }^{-1}}\] particles. Reason : Electrons exist inside the nucleus. [AIIMS 2003]
question_answer6) Assertion : \[_{Z}{{X}^{A}}\] undergoes \[2\alpha -\]decays. \[2\beta -\] decays and \[2\gamma -\]decays and the daughter product is \[_{Z-2}{{Y}^{A-8}}\]. Reason : In a-decay the mass number decreases by 4 and atomic number decreases by 2. In b- decay the mass number remains unchanged, but atomic number increases by 1 only. [AIIMS 2001]
question_answer7) Assertion : Density of all the nuclei is same. Reason : Radius of nucleus is directly proportional to the cube root of mass number. [AIIMS 2000]
question_answer8) Assertion : Isobars are the element having same mass number but different atomic number. Reason : Neutrons and protons are present inside nucleus. [AIIMS 1997]
question_answer9) Assertion : The force of repulsion between atomic nucleus and a-particle varies with distance according to inverse square law. Reason : Rutherford did a-particle scattering experiment.
question_answer10) Assertion : The positively charged nucleus of an atom has a radius of almost \[{{10}^{-15}}m.\] Reason : In a-particle scattering experiment, the distance of closest approach for a-particles is ≃\[{{10}^{-15}}m.\]
question_answer11) Assertion : According to classical theory, the proposed path of an electron in Rutherford atom model will be parabolic. Reason : According to electromagnetic theory an accelerated particle continuously emits radiation.
question_answer12) Assertion : Electrons in the atom are held due to coulomb forces. Reason : The atom is stable only because the centripetal force due to Coulomb?s law is balanced by the centrifugal force.
question_answer13) Assertion : The electron in the hydrogen atom passes from energy level \[n=4\] to the \[n=1\] level. The maximum and minimum number of photon that can be emitted are six and one respectively. Reason : The photons are emitted when electron make a transition from the higher energy state to the lower energy state.
question_answer14) Assertion : Hydrogen atom consists of only one electron but its emission spectrum has many lines. Reason : Only Lyman series is found in the absorption spectrum of hydrogen atom whereas in the emission spectrum, all the series are found.
question_answer15) Assertion : It is essential that all the lines available in the emission spectrum will also be available in the absorption spectrum. Reason : The spectrum of hydrogen atom is only absorption spectrum.
question_answer16) Assertion : For the scattering of a-particles at a large angles, only the nucleus of the atom is responsible. Reason : Nucleus is very heavy in comparison to electrons.
question_answer17) Assertion : All the radioactive elements are ultimately converted in lead. Reason : All the elements above lead are unstable.
question_answer18) Assertion : Amongst alpha, beta and gamma rays, a-particle has maximum penetrating power. Reason : The alpha particle is heavier than beta and gamma rays.
question_answer19) Assertion : The ionising power of b-particle is less compared to a-particles but their penetrating power is more. Reason : The mass of b-particle is less than the mass of a-particle.
question_answer20) Assertion : The mass of b-particles when they are emitted is higher than the mass of electrons obtained by other means. Reason : b-particle and electron, both are similar particles.
question_answer21) Assertion : Radioactivity of \[{{10}^{8}}\] undecayed radioactive nuclei of half-life of 50 days is equal to that of \[1.2\times {{10}^{8}}\] number of undecayed nuclei of some other material with half-life of 60 days Reason : Radioactivity is proportional to half-life.
question_answer22) Assertion : Fragments produced in the fission of \[{{U}^{235}}\] are radioactive. Reason : The fragments have abnormally high proton to neutron ratio.
question_answer23) Assertion : Electron capture occurs more often than positron emission in heavy elements. Reason : Heavy elements exhibit radioactivity.
question_answer24) Assertion : The mass of a nucleus can be either less than or more than the sum of the masses of nucleons present in it. Reason : The whole mass of the atom is considered in the nucleus.
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