 # JEE Main Solved Physics Practice Paper 2017 - 2018 Set - IV

In this article, the engineering section of Jagranjosh is providing JEE Main Solved Physics Practice Paper based on the latest syllabus which will help you in your preparation for coming JEE Main exam. JEE Main Physics Practice Paper

JEE Main is one of the most popular and toughest engineering entrance exams. There are only few months left for the examination. Students already covered most of the syllabus.

Now, students should start solving practice paper to boost their preparation. It will also help in tracking their progress.

In this article you will get solved practice paper of Physics which will help you to know the difficulty level of the questions which can be asked in JEE Main Examination 2018. All questions are of objective type having four options out of which only one is correct.

1. This paper consists of 30 multiple choice questions with only one correct option.

2. Questions have been taken from different chapters like Units and Measurements, Motion in a Straight Line, Laws of Motion, Rotational Motion, Gravitation, Thermodynamics, Kinetic Theory of gases, Waves, Electric Charges and Fields, Electrostatic Potential and Capacitance, Current Electricity, Moving Charges and Magnetism, Magnetism and Matter, Electromagnetic Induction & Alternating Current, Electromagnetic Induction, Alternating Current, Electromagnetic Waves, Dual Nature of Radiation and Matter, Atoms & Nuclei, Semiconductor  Electronics, Communication Systems.

3. Detail solution for all the questions.

Few sample questions from the solved practice paper are given below:

Question:

A positively charged particle is released from rest in a uniform electric field. The electric potential energy of the charge

(a) Remains a constant because the electric field is uniform

(b) Increases because the charge moves along the electric field

(c) Decreases because the charge moves opposite to the electric field

(d) Decreases because the charge moves along the electric field

Sol. (d)

The direction of electric field is always perpendicular to one equipotential surface maintained at high electrostatic potential to other equipotential surface maintained at low electrostatic potential.

The positively charged particle experiences electrostatic force along the direction of electric field i.e., from high electrostatic potential to low electrostatic potential. Thus, the .work is done by the electric field on the positive charge, hence electrostatic potential energy of the positive charge decreases.

Question:

When an electron in hydrogen atom revolves in stationary orbit, it

(a) Does not radiate energy  and its velocity changes.

(b) Does not radiate energy  and its velocity remains unchanged.

(c) Radiates energy but its velocity is unchanged.

(d) Radiates energy with the change of velocity.

Sol. (b)

Electrons can revolve around the nucleus in stationary orbits only which are non-radiating. Energy is radiated only when an electron jumps from an outer stationary orbit to inner stationary orbit. Velocity of electron changes while revolving in stationary but energy remains constant.

Question:

In a cyclotron, a charged particle

(a) Undergoes acceleration all the time

(b) Speeds up between the dees because of the magnetic field

(c) Speeds up in a dee

(d) Slows down within a dee and speeds up between dees

Sol. (a)

The charged particle undergoes acceleration as

(i) speeds up between the dees because of the oscillating electric field and

(ii) speed remain the same inside the dees because of the magnetic field but direction undergoes change continuously.

Question:

In a permanent magnet at room temperature,

(a) Magnetic moment of each molecule is zero

(b) The individual molecules have non - zero magnetic moment which are all perfectly aligned

(c) Domains are partially aligned

(d) Domains are all perfectly aligned

Sol. (d)

As we know a permanent magnet is a substance which at room temperature retains ferromagnetic property for a long period of time. The individual atoms in a ferromagnetic material possess a dipole moment as in a paramagnetic material.

However, they interact with one another in such a way that they spontaneously align themselves in a common direction over a macroscopic volume called domain. Thus, we can say that in a permanent magnet at room temperature, domains are all perfectly aligned.

Question:

A point charge + q is placed at a distance d from an isolated conducting plane. The field at a point P on the other side of the plane is

(a) Directed radially away from the point charge

(b) Directed perpendicular to the plane but towards the plane

(c) Directed perpendicular to the plane and away from the plane

(d) Directed radially towards the point charge

Sol. (c)

When a point positive charge brought near an isolated conducting plane, some negative charge develops on the surface of the plane towards the charge and an equal positive charge develops on opposite side of the plane. This process is called charging by induction.

Conclusion:

After doing a lot of research on previous year papers of JEE Main, the subject experts of Physics have designed this solved practice paper. It will help you to practice the new set of questions and to manage the time accuracy for the coming JEE Main 2018.