MCQ 11 MarkS.I. unit of decay constant is :Ametre✓hertzCper metreDmetre²AnswerCorrect option: B. hertzBView full question & answer→
MCQ 21 MarkHalf-life of radioactive substance is :A$0.6931 \times \lambda$B$\frac{\log 10^2}{\lambda}$✓$\frac{0.6931}{\lambda}$D$\frac{\text { Average age }}{0.6931}$AnswerCorrect option: C. $\frac{0.6931}{\lambda}$CView full question & answer→
MCQ 31 MarkDensity of nucleus is about :A$2.29 \times 10^7 kg m ^{-3}$B$2.29 \times 10^{-7} kg m ^{-3}$✓$2.29 \times 10^{17} kg m ^{-3}$D$2.29 \times 10^{-17} kg m ^{-3}$AnswerCorrect option: C. $2.29 \times 10^{17} kg m ^{-3}$CView full question & answer→
MCQ 41 Mark1 amu (u) is equivalent to :A$1.66 \times 10^{-27} g$✓$1.66 \times 10^{-27} kg$C$1.66 \times 10^{-27} mg$D$1.66 \times 10^{-27} MeV$AnswerCorrect option: B. $1.66 \times 10^{-27} kg$BView full question & answer→
MCQ 51 MarkThe least stable nucleus is :✓${ }_2^4 He$B${ }_6^{12} C$C${ }_8^{16} O$D${ }_{26}^{56} Fe$AnswerCorrect option: A. ${ }_2^4 He$AView full question & answer→
MCQ 61 Mark$\gamma$-rays are similar to :A$\alpha$-raysB$\beta$-raysCcathode rays✓x-raysAnswerCorrect option: D. x-raysDView full question & answer→
MCQ 71 MarkAtomic number decreases with the emission of $\alpha-$-particles from the nucleus by :A1✓2C3D4AnswerCorrect option: B. 2BView full question & answer→
MCQ 81 MarkThe quantities that remain conserved in a nuclear reaction :ATotal chargeBAngular momentumCLinear momentum✓None of theseAnswerCorrect option: D. None of theseDView full question & answer→
MCQ 91 MarkTime during which the amount of radioactive substance becomes half of its initial amount is called :AAverage life✓Half lifeCDecay constantDTime periodAnswerCorrect option: B. Half lifeBView full question & answer→
MCQ 101 MarkWhich one of following is charge less ?AAlpha particleBBeta particle✓Photon particleDProtonAnswerCorrect option: C. Photon particleCView full question & answer→
MCQ 111 Mark$\beta$-particles are of high speed :✓electronBprotonCneutronDphotonAnswerCorrect option: A. electronAView full question & answer→
MCQ 121 MarkWhich one of the following has maximum penetrating power ?A$\alpha$-raysB$\beta$-raysCCathode rays✓$\gamma$-raysAnswerCorrect option: D. $\gamma$-raysDView full question & answer→
MCQ 131 Mark$\beta$-rays are deflected in :AGravitational fieldBOnly in magnetic fieldCOnly in electric field✓Both in magnetic and electric fieldsAnswerCorrect option: D. Both in magnetic and electric fieldsDView full question & answer→
MCQ 141 MarkNumber of neutrons in an atom of ${ }_{90} Th ^{230}$ is :A320B230✓140D90AnswerCorrect option: C. 140CView full question & answer→
MCQ 151 MarkThe minimum energy of $\gamma$-photon to produce pair production will be :A931 MeVB9.31 MeVC102 MeV✓1.02 MeVAnswerCorrect option: D. 1.02 MeVDView full question & answer→
MCQ 161 MarkThe equivalent energy to 1 amu is :A190 MeVB139 MeVC913 MeV✓931 MeVAnswerCorrect option: D. 931 MeVDView full question & answer→
MCQ 171 MarkIn atomic bomb the source of large amount of energy is :ANuclear fusion✓Nuclear fissionCBoth (a) and (b)DNone of theseAnswerCorrect option: B. Nuclear fissionBView full question & answer→
MCQ 181 MarkIn hydrogen bomb large amount of energy is produced due to :✓Nuclear fusionBNuclear fissionCBoth (a) and (b)DNone of theseAnswerCorrect option: A. Nuclear fusionAView full question & answer→
MCQ 191 MarkEinstein's mass-energy relation is :A$E = m c$B$E =m c^2 / 2$✓$E = m c ^2$D$E = m / c$AnswerCorrect option: C. $E = m c ^2$CView full question & answer→
MCQ 201 MarkEnergy production in nuclear reactor is due to :✓Nuclear fissionBNucleus fusionCBoth (a) and (b)DNone of theseAnswerCorrect option: A. Nuclear fissionAView full question & answer→
MCQ 211 MarkWhen two light nuclei are fused together to form a single heavy nucleus this process is called :ANuclear fission✓Nuclear fusionCRadioactivityDNone of theseAnswerCorrect option: B. Nuclear fusionBView full question & answer→
MCQ 221 MarkWhen a heavy nuclei breaks up into two equal nuclei, this process is called :✓Nuclear fissionBNuclear fusionCNuclear reactionDNone of theseAnswerCorrect option: A. Nuclear fissionAView full question & answer→
MCQ 231 MarkThe radioactive material does not emit :AElectrons✓ProtonsC$\gamma$-raysDHelium nucleiAnswerCorrect option: B. ProtonsBView full question & answer→
MCQ 241 MarkThe particle which is emitted from radioactive substance is :✓AlphaBNeutronCPositronDProtonAnswerCorrect option: A. AlphaAView full question & answer→
MCQ 251 MarkIn ${ }_0^1 n \rightarrow{ }_1^1 H +{ }_{-1}^0 \beta$ symbol ${ }_1^1 H$ represents :Aelectron✓protonC$\gamma$-raysD$\alpha$-particleAnswerCorrect option: B. protonBView full question & answer→
MCQ 261 MarkRadioactivity is a phenomenon associated with :✓Decay of nucleusBProduction of radio wavesCTransmission of radiowavesDNone of theseAnswerCorrect option: A. Decay of nucleusAView full question & answer→
MCQ 271 MarkWhich of the following can be deflected by applying magnetic field ?A$\alpha$-raysB$\beta$-raysC$\gamma$-rays✓$\alpha-$ and $\beta$-rays bothAnswerCorrect option: D. $\alpha-$ and $\beta$-rays bothDView full question & answer→
MCQ 281 MarkWhich of the following has minimum wavelength ?Ayellow lightBX-raysC$\alpha$-rays✓$\gamma$-raysAnswerCorrect option: D. $\gamma$-raysDView full question & answer→
MCQ 291 MarkWhich of the following is electromagnetic wave ?A$\alpha$-raysB$\beta^{+}$-decayC$\beta^{-}$-rays✓$\gamma$-raysAnswerCorrect option: D. $\gamma$-raysDView full question & answer→
MCQ 301 MarkIn which disintegration out of the following disintegration atomic number decreases ?A$\alpha$-decayB$\beta^{+}$-decay✓both (a) and (b)D$\gamma$-decayAnswerCorrect option: C. both (a) and (b)CView full question & answer→
MCQ 311 MarkIn which of the following decay the structure of the nucleus does not change ?A$\alpha$-decayB$\beta^{+}$-decayC$\beta^{-}$-decay✓$\gamma$-decayAnswerCorrect option: D. $\gamma$-decayDView full question & answer→
MCQ 321 MarkOut of radioactive radiation which has highest penetrating power ?✓$\gamma$-raysB$\beta$-raysC$\alpha$-particleDnone of theseAnswerCorrect option: A. $\gamma$-raysAView full question & answer→
MCQ 331 MarkIn radioactive disintegration $\alpha$-particle, $\beta$-particle and $\gamma$-rays are emitted. Out of these which has highest ionisation power ?A$\gamma$-raysB$\beta$-rays✓$\alpha$-particleDnone of theseAnswerCorrect option: C. $\alpha$-particleCView full question & answer→
MCQ 341 Mark$\gamma$-rays are produced :✓by nucleus of radioactive elementBby excited atomCboth (a) and (b)Dnone of theseAnswerCorrect option: A. by nucleus of radioactive elementAView full question & answer→
MCQ 351 MarkNumber and type of nucleons in the nucleus of Deuterium $\left({ }_1^2 H \right)$ will be :A2 protons✓1 proton and 1 neutronC2 neutronsD1 proton and 1 electronAnswerCorrect option: B. 1 proton and 1 neutronBView full question & answer→
MCQ 361 MarkNuclear force is :Agravitational force✓exchange forceCmagnetic forceDelectrostatic forceAnswerCorrect option: B. exchange forceBView full question & answer→
MCQ 371 MarkAtoms of an element differing in mass though possessing the same chemical properties are called :Aisotones✓isotopesCisobarsDisomersAnswerCorrect option: B. isotopesBView full question & answer→
MCQ 381 MarkA $\beta$-particle is emitted from ${ }_{90}^{234} Th$ nucleus. The atomic mass number of the remaining nucleus A and atomic number Z for it will be respectively :✓234, 91B234, 90C230, 98D232, 86AnswerCorrect option: A. 234, 91AView full question & answer→
MCQ 391 MarkThe atomic number of two atoms are equal but their atomic masses are different. These will be✓isotopesBisobarsCisotonesDnone of theseAnswerCorrect option: A. isotopesAView full question & answer→
MCQ 401 MarkThe value of ratio N/Z is great for heavy nucleus because :Aneutron is heavy than protonBneutron is a unstable particle✓no any repulsive force is produced by neutronsDrange of coulombian force is equal to range of nuclear forceAnswerCorrect option: C. no any repulsive force is produced by neutronsCView full question & answer→
MCQ 411 MarkWhich of the relations is correct for radioactive atom ?AHalf life = average lifeBHalf life = 2 × Average lifeCHalf-life = 1.6931 × Average life✓Half-life = 0.6931 × Average lifeAnswerCorrect option: D. Half-life = 0.6931 × Average lifeDView full question & answer→