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1.

Assertion : In a nuclear process energy is released if total binding energy of daughter nuclei is more than the total binding energy of parent nuclei. Reason: If energy is released then total mass of daughter nuclei is less than the total mass of parent nuclei.A. (a) If both Assertion and Reason are true and Reason is correct explanation of the Assertion.B. (b) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.C. (c) If Assertion is true, but the Reason is false.D. (d) If Assertion is false but the Reason is true.

Answer» Correct Answer - A::B
Discussion
2.

The decay constant of a radioactive sample is `lambda`. The half-life and the average-life of the sample are respectivelyA. (a) `1//lambda` and `(In2)//lambda`B. (b) `(In2)//lambda` and `1//lambda`C. (c) `lambda(In2)` and `1//lambda`D. `lambda//(In2)` and `1//lambda`

Answer» Correct Answer - B
Discussion
3.

During a beta decayA. (a) an atomic electron is ejectedB. (b) an electron present inside the nucleus is ejectedC. (c) a neutron in the nucleus decays emitting and electronD. (d) a part of the binding energy is converted into electron

Answer» Correct Answer - C
Discussion
4.

Assertion : Binding energy per nucleon is of the order of MeV. Reason: `1 MeV=1.6xx10^-13J`.A. (a) If both Assertion and Reason are true and Reason is correct explanation of the Assertion.B. (b) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.C. (c) If Assertion is true, but the Reason is false.D. (d) If Assertion is false but the Reason is true.

Answer» Correct Answer - B
Discussion
5.

During a nuclear fusion reaction,A. (a) a heavy nucleus breaks into two fragements by itselfB. (b) a light nucleus bombarded by thermal neutrons breaks upC. (c) a heavy nucleus bombarded by thermal neutrons breaks upD. (d) two light nuclei combine to give a heavier nucleus and possibly other products

Answer» Correct Answer - D
Discussion
6.

Complete the nuclear reactions. (a) `_3^6Li+?rarr_4^7Be+_0^1n` (b) `_17^35CI+?rarr_16^32S+`_2^4He` (c) `_4^9Be+_2^4Herarr3(`_2^4He)+?` (d) `_35^79Br+_2^1Hrarr?+2(`_0^1n)`

Answer» Correct Answer - A::B::C::D
Discussion
7.

Regarding the nuclear forces, choose the correct options.A. (a) They are short range forcesB. (b) They are charge independent forcesC. (c) They are not electromagnetic forcesD. (d) They are exchange forces

Answer» Correct Answer - A::B::C::D
Discussion
8.

Choose the correct options.A. (a) Isotopes have same number of atomic numberB. (b) Isobars have same atomic weightC. (c) Isotones have same number of neutronsD. (d) In neutral isotope atoms number of electrons are same

Answer» Correct Answer - A::B::C::D
Discussion
9.

Complete the following reactions. (a) `_88^226 Rararralpha+` (b) `_8^19Orarr_9^19F+` (c) `_13^25AIrarr_12^25Mg+`

Answer» Correct Answer - A::B::C
Discussion
10.

In the nucleus of helium if `F_1 is the net force between two protons, `F_2` is the net force between two neutrons and `F_3` is the net force between a proton and a neutron. Then,A. (a) `F_1=F_2=F_3`B. (b) `F_1gtF_2gtF_3`C. (c) `F_2gtF_3gtF_1`D. (d) `F_2=F_3gtF_1`

Answer» Correct Answer - A
Discussion