PYQSide ExamsMy practice

Nuclei · Question 26

NEET 2013 (Karnataka)MCQEasy📈 Topic in 0% papers+4−1
1

How does the Binding Energy per nucleon vary with the increase in the number of nucleons ?

  1. Decreases continuously with mass number.
  2. First decreases and then increases with increase in mass number.
  3. First increases and then decreases with increase in mass number.
  4. Increases continuously with mass number.

Answer

(3) First increases and then decreases with increase in mass number.

Solution

As per NCERT, the binding energy per nucleon rises with mass number for light nuclei,

reaches a maximum of about 8.75 MeV near A = 56 (Fe),

and then decreases slowly (about 7.6 MeV for A = 238).

∴ It first increases and then decreases with increase in mass number.

Answer: (3)

NEET 2013 (Karnataka)

Keep practising — Nuclei

2

-particles, -particles and -rays are all having same energy. Their penetrating power in a given medium in increasing order will be

  1. , ,
  2. , ,
  3. , ,
  4. , ,
Out of syllabusNEET 2013 (Karnataka)
3

The half life of a radioactive nucleus is 50 days. The time interval (t2 - t1) between the time t2 when 23 of it has decayed and the time t1 when 13 of it had decayed is

  1. 30 days
  2. 50 days
  3. 60 days
  4. 15 days
Out of syllabusAIPMT 2012 (Mains)
4

If the nuclear radius of 27Al is 3.6 fermi, the approximate nuclear radius of 64Cu in fermi is

  1. 2.4
  2. 1.2
  3. 4.8
  4. 3.6
Out of syllabusAIPMT 2012 (Prelims)
5

A mixture consists of two radioactive materials A1 and A2 with half lives of 20 s and 10 s respectively. Initially the mixture has 40 g of A1 and 160 g of A2. The amount of the two in the mixture will become equal after

  1. 60 s
  2. 80 s
  3. 20 s
  4. 40 s
Out of syllabusAIPMT 2012 (Prelims)
6

Two radioactive nuclei P and Q, in a given sample decay into a stable nucleus R. At time t = 0, the number of P species is 4N0 and that of Q is N0. Half-life of P (for conversion to R) is 1 minute whereas that of Q is 2 minutes. Initially there are no nuclei of R present in the sample. When number of nuclei of P and Q are equal, the number of nuclei of R present in the sample would be

  1. 2N0
  2. 3N0
  3. 9N02
  4. 5N02
Out of syllabusAIPMT 2011 (Mains)
7

The power obtained in a reactor using 235U disintegration is 1000 kW. The mass decay of 235U per hour is

  1. 10 microgram
  2. 20 microgram
  3. 40 microgram
  4. 1 microgram
AIPMT 2011 (Prelims)
8

Fusion reaction takes place at high temperature because

  1. nuclei break up at high temperature
  2. atoms get ionised at high temperature
  3. kinetic energy is high enough to overcome the Coulomb repulsion between nuclei
  4. molecules break up at high temperature
AIPMT 2011 (Prelims)
9

The half life of a radioactive isotope X is 50 years. It decays to another element Y which is stable. The two elements X and Y were found to be in the ratio of 1 : 15 in a sample of a given rock. The age of the rock was estimated to be

  1. 150 years
  2. 200 years
  3. 250 years
  4. 100 years
Out of syllabusAIPMT 2011 (Prelims)
10

A nucleus mnX emits one particle and two particles. The resulting nucleus is

  1. m-6n-4Z
  2. m-6nZ
  3. m-4nX
  4. m-4n-2Y
Out of syllabusAIPMT 2011 (Prelims)
11

The binding energy per nucleon in deuterium and helium nuclei are 1.1 MeV and 7.0 MeV, respectively. When two deuterium nuclei fuse to form a helium nucleus the energy released in the fusion is

  1. 23.6 MeV
  2. 2.2 MeV
  3. 28.0 MeV
  4. 30.2 MeV
AIPMT 2010 (Mains)

All Nuclei PYQs →

PDFDownload Nuclei PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All NEET Physics chapters
Class 11Units and MeasurementsMotion in a Straight LineMotion in a PlaneLaws of MotionWork, Energy and PowerSystem of Particles and Rotational MotionGravitationMechanical Properties of SolidsMechanical Properties of FluidsThermal Properties of MatterThermodynamics (Physics)Kinetic TheoryOscillationsWaves
Class 12Electric Charges and FieldsElectrostatic Potential and CapacitanceCurrent ElectricityMoving Charges and MagnetismMagnetism and MatterElectromagnetic InductionAlternating CurrentElectromagnetic WavesRay Optics and Optical InstrumentsWave OpticsDual Nature of Radiation and MatterAtomsNucleiSemiconductor ElectronicsExperimental Skills (Physics)