# JEE Main Solved Practice Paper 2017 - 2018 Set-III

Find solved practice paper (90 questions) for JEE Main entrance examination 2018. It is prepared by experienced Subject Experts. It will help students to track their progress and perform well in the examination.

*JEE Main 2018: Practice Paper*

JEE Main 2018 is scheduled to be held on **April 8, 2018** in offline mode while computer based test will be conducted on **April 15** and **16, 2018**.

It is necessary for students to get familiar with the pattern of the paper before appearing for the examination. On the basis of pattern of the question paper, Students can make strategy to attempt the paper.

By practicing the paper, students can get the following benefits:

- Good idea about the different verities of questions
- Good idea to guess the answer
- Enough practice to fill the OMR sheet and finally
- Time management

**First attempt for JEE Main? Must read this article to crack the exam**

**About the Paper:**

There are three sections in this paper namely Physics, Chemistry and Mathematics. Each section consists of 30 questions. The time allotted to complete the paper is 3 hours.

**Chemistry**

There are 30 questions in this practice paper from different topics of Chemistry like Basic Concepts of Chemistry, Structure of Atom, Electrochemistry, Solid State, Chemical Kinetics, Thermodynamics, Surface Chemistry, Chemistry in Everyday Life, Polymers, Biomolecules, Aldehydes, Ketones and Carboxylic Acids, Organic Compounds containing Nitrogen, Solutions, and Coordination Compounds. For each correct answer +4 marks will be awarded and one mark will be deducted for each incorrect answer. Zero marks will be awarded for any unattempted question.

**Few sample questions from the Practice Paper are given below:**

**Question:**

Which of the following is correct?

(a) Isotones differ in the number of neutrons.

(b) Isobars contain the same number of neutrons but differ in the number of protons.

(c) No isotope of hydrogen in radioactive,

(d) Density of nucleus is much greater than that of atom.

**Sol. (d)**

Statement (a) is not correct because isotones have the same number of neutrons.

Statement (b) is not correct as isobars differ in the number of neutrons because A is same but Z is different and neutrons = A – Z.

Statement (c) is not correct because tritium is radioactive.

**Question:**

Photoelectric effect is the phenomenon in which

(a) Photons come out the metal when hit by a beam of electrons

(b) Photons come out of the nucleus of an atom under the action of an electric field

(c) Electrons come out of metal with a constant velocity which depends on frequency and intensity of incident light

(d) Electrons come out of metal with different velocities not greater than a certain value which depends upon frequency of incident light and not on intensity

**Sol. (d)**

In photoelectric effect, kinetic energy and hence velocity is directly proportional to frequency of the incident light and independent of the intensity of light.

**Physics**

Here, you will get a set of 30 questions from different topics of Physics like Laws of Motion, Work, Energy and Power, System of Particles and Rotational Motion, Gravitation, Properties of Bulk Matter, Thermodynamics, Kinetic Theory of Gases, Oscillation & Waves, Electric Charges and Fields, Electrostatic Potential and Capacitance, Current Electricity, Moving Charges and Magnetism, Magnetism and Matter, Electromagnetic Induction & Alternating Current, Electromagnetic Waves, Optics, Ray Optics and Optical Instruments, Dual Nature of Matter, Atoms & Nuclei, Electronic Devices, Communication Systems. For each correct answer you will be award +4 marks and for each incorrect answer one mark will be deducted. Zero mark will be awarded for unattempted questions.

**Few sample questions from the Practice Paper are given below:**

**Question:**

In a Young's double-slit experiment, the source is white light. One of the holes is covered by a red filter and another by a blue filter. In this case,

(a) There shall be alternate interference patterns of red and blue

(b) There shall be an interference pattern for red distinct from that for blue

(c) There shall be no interference fringes

(d) There shall be an interference pattern for red mixing with one for blue

**Sol. (c)**

For the interference pattern to be formed on the screen, the sources should be coherent and emits lights of same frequency and wavelength.

In a Young's double-slit experiment, when one of the holes is covered by a red filter and another by a blue filter. In this case due to Alteration only red and blue lights are present. In YDSE monochromatic light is used for the formation of fringes on the screen. Hence, in this case there shall be no interference fringes.

**Question:**

Hole is

(a) An anti-particle of electron

(b) A vacancy created when an electron leaves a covalent bond

(c) Absence of free electrons

(d) An artificially created particle

**Sol. (b)**

The concept of hole describes the lack of an electron at a position where one could exist in an atom or atomic lattice. If an electron is excited into a higher state, it leaves a hole in its old state.

**Mathematics**

Mathematics is one of the most scoring subjects among three. The marking scheme and number of questions are exactly same as other section of the sample paper. There are 30 questions in this practice paper from different topics like Relations and Functions, Trigonometric Functions, Complex Numbers and Quadratic Equations, Permutations and Combinations, Binomial Theorem, Sequences and Series, Straight Lines, Conic Sections, Introduction to Three Dimensional Geometry, Limits and Derivatives, Probability, Inverse Trigonometric Functions, Matrices, Determinants, Continuity and Differentiability, Application of Derivatives, Integrals, Application of Integrals, Differential Equations, Vector Algebra, Three Dimensional Geometry.

**Few sample questions from the Practice Paper are given below:**

**Question:**

Three normals are drawn from the point (c, 0) to the curve y^{2} = x. If two of the normals are perpendicular to each other, then c =

(a) 1/4

(b) 1/2

(c) 3/4

(d) 1

**Sol. (c)**

**Question:**

The curve *y *= *x*^{1/5} has at (0, 0)

(a) A vertical tangent (parallel to *Y*-axis)

(b) A horizontal tangent (parallel to *X*-axis)

(c) An oblique tangent

(d) No tangent

**Sol. (a)**

**Conclusion:**

The main objective of this practice paper is to help students in assessing their preparation and time management skills. It will help students to get familiar with the difficulty level and pattern of the examination as the sample paper matches exactly with JEE Main Question Paper.

**JEE Main 2018:Role and importance of mock test for cracking the exam**