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JEE-Main - Grade 12 - Chemistry - Biomolecules - Introduction and Snapshot of Biomolecules - Study ref# 890

Introduction: A living system grows, sustains and reproduces itself. The most amazing thing about a living system is that it is composed of non-living atoms and molecules. The pursuit of knowledge of what goes on chemically within a li... read more

JEE-Main - Grade 12 - Chemistry - Biomolecules - Introduction and Snapshot of Biomolecules - Study ref# 891

Following sections must be covered to understand the Biomolecules: 1. Carbohydrates 2. Proteins 3. Enzymes 4. Vitamins 5. Nucleic Acids... read more

JEE-Main - Grade 12 - Physics - Nuclei - Introduction and Snapshot of Nuclei - Study ref# 842

Introduction: In the previous chapter, we have learnt that in every atom, the positive charge and mass are densely concentrated at the center of the atom forming its nucleus. The overall dimensions of a nucleus are much smaller than th... read more

JEE-Main - Grade 12 - Physics - Nuclei - Introduction and Snapshot of Nuclei - Study ref# 843

Following sections must be covered to understand the Nuclei: 1. Introduction 2. Atomic Masses and Composition of Nucleus 3. Size of the Nucleus 4. Mass 5. Nuclear Force 6. Radioactivity 7. Nuclear Energy... read more

JEE-Main - Grade 12 - Physics - Nuclei - Target Setup for Nuclei - Study ref# 844

Student requires to achieve the following milestones to get better grip over Nuclei. The milestones / targets are as follows: Starting Point: Days 0Test TypeAppear on TestTarget TestsScorePractice Test000%Chapter Test000%Subject ... read more

JEE-Main - Grade 11 - Physics - Units and Measurements - Study ref# 4

The unit of length convenient on the nuclear scale is a fermi. . Nuclear sizes obey roughly the following empirical relation:  where r is the radius of nucleus, A its mass number and r0 is a constant equal to about 1.2 fermi. S... read more

JEE-Main - Grade 11 - Chemistry - Classification of Elements and Periodicity in Properties - Study ref# 1264

What does atomic radius or ionic radius mean to you? Answer: Atomic radius Atomic radius means size of the atom. It can be measured by X-ray or other spectroscopic methods. In case of non-metals, it is called covalent radius and if the element ... read more

JEE-Main - Grade 11 - Chemistry - Classification of Elements and Periodicity in Properties - Study ref# 1275

How does the metallic and non-metallic character vary on moving from left to right in a period? Answer: As we move from left to right in a period, the number of valence electrons increases by one at each succeeding element but the number of ... read more

JEE-Main - Grade 11 - Chemistry - Chemical Bonding and Molecular Structure - Study ref# 1324

Write the resonance structures for SO3, NO2 and. Answer:  Sulphur trioxide, SO3   Nitrogen dioxide,NO2 Nitrate ion, NO-3   Hints: Draw the possible structures in which octet (duplet in case of H) ... read more

JEE-Main - Grade 12 - Chemistry - Biomolecules - Study ref# 10012

Nucleic acids are the polymers of (a) nucleosides   (b) nucleotides      (c) bases         (d) sugars Answer: Nucleic acids are polymers of nucleotides in which nucleic acids are linked together by phosphodiester linkage. e.g., D.N.A... read more

JEE-Main - Grade 12 - Chemistry - Chemistry in Everyday Life - Study ref# 10061

The most useful classification of drugs for medicinal chemists is……. (a) on the basis of chemical structure (b) on the basis of drug action (c) on the basis of molecular targets (d) on the basis of pharmacological effect A... read more

JEE-Main - Grade 12 - Chemistry - Chemistry in Everyday Life - Study ref# 10069

Which of the following is not a target molecule for drug function in body? (a) Carbohydrates      (b) Lipids     (c) Vitamins        (d) Proteins Answer: (c) Drugs usually interact with biomolecules as carbohydrates, lipids, proteins and ... read more

JEE-Main - Grade 12 - Physics - Atoms - Study ref# 10649

 molecule consists of two oxygen atoms. In the molecule, nuclear force between the nuclei of the two atoms (a) is not important because nuclear forces are short-ranged. (b) is as impo... read more

JEE-Main - Grade 12 - Physics - Nuclei - Study ref# 10665

Write the relation for binding energy (BE) (in MeV) of a nucleus of mass  atomic number (Z) and mass number (A) in terms of the masses of its constituents – neutrons and protons. Answer: B.E. = read more

JEE-Main - Grade 12 - Physics - Nuclei - Study ref# 10666

Two nuclei have mass numbers in the ratio 1:2. What is the ratio of their nuclear densities? Answer: The nuclear density is same for all the nuclei. Hence the ratio of their densities is 1:1.... read more

JEE-Main - Grade 12 - Physics - Nuclei - Study ref# 10667

Calculate the energy in fusion reaction:  where, BE of  and of   Answer: Total Binding energy of Initial System i.e.,        read more

JEE-Main - Grade 12 - Physics - Nuclei - Study ref# 10668

Four nuclei of an element undergo fusion to form a heavier nucleus, with release of energy. Which of the two – the parent of the daughter nuclei – would have higher binding energy per nucleon? Answer: Daughter nuclei have higher binding ener... read more

JEE-Main - Grade 12 - Physics - Nuclei - Study ref# 10669

If both the number of protons and neutrons in a nuclear reaction is conserved, in what way is mass converted into energy (or vice versa)? Explain giving one example. Answer:   If we take ab... read more

JEE-Main - Grade 12 - Physics - Nuclei - Study ref# 10670

Show that the density of nucleus over a wide range of nuclei is constant and independent of mass number. Answer: We have                                                                                                      ∴ Density,  ... read more

JEE-Main - Grade 12 - Physics - Nuclei - Study ref# 10671

(i) The mass of a nucleus in its ground state is always less than the total mass of its constituents-neutrons and protons. Explain. (ii) Plot a graph showing variation of potential energy of a pair of nucleons as a function of their separ... read more

JEE-Main - Grade 12 - Physics - Nuclei - Study ref# 10672

(i) Explain the processes of nuclear fission and nuclear fusion by using the plot of binding energy per nucleon (BE/A) versus the mass number A. (ii) A radioactive isotope has a half-life of 10 years. How long will it take for the activit... read more

JEE-Main - Grade 12 - Physics - Nuclei - Study ref# 10673

Binding energy per nucleon versus mass number curve is as shown.  and  are four nuclei indicated on the curve. Based on the graph: (a) Arrange X,W and S in the increasing ... read more

JEE-Main - Grade 12 - Physics - Nuclei - Study ref# 10674

How are protons, which are positively charged, held together inside a nucleus? Explain the variation of potential energy of a pair of nucleons as a function of their separation. State the significance of negative potential energy in this reg... read more

JEE-Main - Grade 12 - Physics - Nuclei - Study ref# 10675

The gravitational force between a H-atom and another particle of mass m will be given by Newton’s law:        (a)   (b) read more

JEE-Main - Grade 12 - Physics - Nuclei - Study ref# 10677

A radioactive nucleus ʹAʹ undergoes a series of given below:   The mass number and atomic number of  are 176 and 71 respectively. Determine the mass and atomic numbers of read more

JEE-Main - Grade 12 - Physics - Nuclei - Study ref# 10679

In both  and  decay processes, the mass number of a nucleus remains same whereas the atomic number Z increases by one in  decay and decreased by one in  decay. Explain, giving reason. Answe... read more

JEE-Main - Grade 12 - Physics - Nuclei - Study ref# 10680

(i) Write the basic nuclear process involved in the emission of  in a symbolic form, by a radioactive nucleus. (ii) In the reactions given below: (a)   (b) read more

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