The energy equivalent of one atomic mass unit is:
1.
2.
3. 931 MeV
4. 9.31 MeV
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologySolar energy is due to:
1. fusion reaction.
2. fission reaction.
3. combustion reaction.
4. chemical reaction.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAt time t = 0, N1 nuclei of decay constant λ1 and N2 nuclei of decay constant λ2 are mixed. The decay rate of the mixture is:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA nucleus emits one and two particles. The resulting nucleus is
1.
2.
3.
4. None of these
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe half-life period of a radioactive substance is 6 h. If after 24 h, activity is 0.01 Ci, what was the initial activity?
1. 0.04 Ci
2. 0.08 Ci
3. 0.24 Ci
4. 0.16 Ci
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe radius of a nucleus of a mass number A is directly proportional to [MH CET 1999; AMU (En.) 2001; UPSEAT 2004; DUMET 2010]
1.
2. A
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biologyand are masses of proton and neutron respectively. An element of mass m has Z protons and N neutrons, then
1.
2.
3.
4. m may be greater than, less than or equal to , depending on the nature of the element.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe nuclei can be described as [1990]
1. isotones
2. isobars
3. isotopes of carbon
4. isotopes of nitrogen
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe radioactivity of a sample is at a time and at time . If the mean life of the specimen is T, the number of atoms that have disintegrated in the time interval of is:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhat is the radius of iodine atom? (atomic no. 53, mass no. 126) [1988]
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology