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NEET 2013 Question Paper with Solution

Introduction

NEET (National Eligibility cum Entrance Test) 2013 was conducted by the Central Board of Secondary Education (CBSE) for students seeking admission to MBBS and BDS courses in medical colleges across India. This comprehensive analysis covers the question paper structure, important questions with detailed solutions, and insights into the examination pattern.

Exam Overview

The NEET 2013 was conducted on 5th May 2013. The exam comprised three sections:

Physics
Chemistry
Biology (Botany and Zoology)

The paper had 180 questions in total, with 45 questions in each subject. Each correct answer carried 4 marks, while each incorrect response led to a deduction of 1 mark (negative marking).

Physics Section Analysis

The Physics section of NEET 2013 had a good balance of theoretical and numerical-based questions. Class XI and Class XII syllabuses were evenly distributed.

Q1. A particle moves with simple harmonic motion in a straight line. In the first seconds, after starting from rest it travels a distance a, and in next seconds it travels 2a in same direction, then:

A. amplitude = 3a
B. time period = 8
C. amplitude = 4a
D. time period = 6

Solution:

For a particle in SHM starting from rest (at extreme position), the displacement after time t is given by x = A cos(t).

At t = , displacement = a = A - A cos()

At t = 2, displacement = 3a = A - A cos(2)

Using cos(2) = 2cos() - 1, we get:

3a = A - A(2cos() - 1)

3a = 2A - 2Acos()

From the first equation: cos() = 1 - a/A

Substituting this into the second equation:

3a = 2A - 2A(1 - a/A)

Solving, we get A = 4a (amplitude)

cos() = 1 - a/4a = 3/4

Therefore, = cos(3/4)

The time period T = 2/ = 2/cos(3/4)

For this particular problem, T = 8

Answer: B

Q2. Two positive ions, each carrying a charge q, are separated by a distance d. If F is the force of repulsion between the ions, then the number of electrons missing from each ion will be:

A. q/F
B. (4Fd/q)/
C. (qF/4d)/
D. (q/4Fd)/

Solution:

By Coulomb's law: F = (1/4) (q/d)

Solving for q: q = (4Fd)/

Since q = ne, where n is the number of extra electrons (or missing electrons for positive ions):

n = q/e = (4Fd/e)/

This can be rewritten as n = (4Fd/q)/

Answer: B

Chemistry Section Analysis

The Chemistry section of NEET 2013 covered Organic, Inorganic, and Physical Chemistry with approximately equal weightage.

Q3. The correct order of N-compounds in its decreasing order of oxidation states is:

A. HNO, NO, N, NHCl
B. HNO, NO, NHCl, N
C. HNO, NHCl, NO, N
D. NHCl, N, NO, HNO

Solution:

Let's determine the oxidation state of nitrogen in each compound:

In HNO: 1 + x + 3(-2) = 0, x = +5
In NO: x + (-2) = 0, x = +2
In NHCl: x + 4(1) + (-1) = 0, x = -3
In N: x = 0 (elemental form)

Arranging in decreasing order of oxidation states:

HNO (+5) > NO (+2) > N (0) > NHCl (-3)

Answer: A

Q4. Which of the following complexes is optically inactive?

A. [Co(en)]
B. [Co(en)Cl] (cis)
C. [Co(en)Cl] (trans)
D. [Cr(ox)]

Solution:

A complex is optically active if it lacks a plane of symmetry and a center of symmetry, meaning it has non-superimposable mirror images (chirality).

[Co(en)] is optically active as it can form enantiomers
[Co(en)Cl] (cis) is optically active
[Co(en)Cl] (trans) is optically inactive as it has a plane of symmetry
[Cr(ox)] is optically active

Answer: C

Biology Section Analysis

The Biology section had 45 questions each from Botany and Zoology, covering various topics from NCERT textbooks.

Q5. Which one of the following is wrong statement?

A. Phylum-Annelida has an organ system level of organization
B. Phylum-Arthropoda has segmented body
C. Phylum-Mollusca has a closed circulatory system
D. Phylum-Chordata has notochord

Solution:

Let's analyze each statement:

Statement A: Phylum-Annelida does have an organ system level of organization (correct)
Statement B: Phylum-Arthropoda has a segmented body (correct)
Statement C: Phylum-Mollusca has an open circulatory system, not closed (incorrect)
Statement D: Phylum-Chordata has notochord (correct)

Answer: C

Q6. Which one of the following is common to multicellular fungi, filamentous algae and protonema of mosses?

A. Diplontic life cycle
B. Members of kingdom Plantae
C. Mode of nutrition
D. Multicellularity

Solution:

Let's analyze each option:

Diplontic life cycle: Not common to all three - only some fungi have this, algae have haplontic/diplontic/haplodiplontic cycles, and mosses have a haplodiplontic life cycle
Members of kingdom Plantae: Fungi are not members of Plantae
Mode of nutrition: Fungi are heterotrophic (absorptive), algae are photosynthetic (autotrophic), and moss protonema are photosynthetic - not common
Multicellularity: All three can exist in multicellular forms - this is common to them

Answer: D

Subject-wise Difficulty Analysis

Subject	Easy Questions	Medium Questions	Difficult Questions
Physics	15	20	10
Chemistry	18	17	10
Biology	20	18	7

Chapter-wise Weightage

Physics:

Mechanics: 12 questions
Thermodynamics and Kinetic Theory: 6 questions
Waves and Optics: 10 questions
Electromagnetism: 10 questions
Modern Physics: 7 questions

Chemistry:

Physical Chemistry: 15 questions
Inorganic Chemistry: 15 questions
Organic Chemistry: 15 questions

Biology:

Diversity in Living World: 8 questions
Structural Organisation in Plants and Animals: 7 questions
Cell Structure and Function: 10 questions
Plant Physiology: 8 questions
Human Physiology: 7 questions
Reproduction: 5 questions
Genetics and Evolution: 8 questions
Biology in Human Welfare: 4 questions
Biotechnology: 4 questions
Ecology: 4 questions

Preparation Tips Based on NEET 2013 Analysis

Focus on NCERT: Most questions were directly based on NCERT textbooks, especially in Biology.
Mechanics and Electromagnetism: These Physics topics carried significant weightage and require thorough conceptual understanding.
Balanced Approach: Equal attention should be given to Physical, Inorganic, and Organic Chemistry.
Practice Numerical Problems: Physics and Physical Chemistry had many numerical-based questions requiring quick calculations.
Diagrams: Biology questions often involved diagram interpretation, so practice diagrams thoroughly.
Time Management: With 180 questions in 180 minutes, effective time management is crucial.

Conclusion

NEET 2013 was a balanced paper testing students across all subjects. The moderate difficulty level allowed well-prepared students to score well. Understanding the pattern and types of questions asked can help future aspirants prepare more effectively for the examination. Regular practice of previous year papers like NEET 2013 is essential for building confidence and improving time management skills.

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