# WBJEE Solved Physics Practice Paper 2018 Set-I

In this article, students will find Solved Practice Paper of Physics for WBJEE 2018. It will help students to understand the pattern and difficulty level of the examination.

Feb 8, 2018 18:19 IST
WBJEE 2018: Physics Solved Practice Paper

Before appearing for the any engineering entrance examination it is very important for students to get familiar with the pattern and difficultly level of the paper. If they know the pattern and difficulty level of the paper, then they can easily make strategies.

In this article, engineering aspirants who are going to appear for WBJEE 2018 will find Solved Practice Paper of Physics based on the latest pattern and syllabus.

WBJEE Solved Question Paper 2016

The questions have been divided into three categories which are given below:

Category 1:

1. There are 30 questions numbered from 1 to 30.
2. Out of four options only one option was correct.
3. For each incorrect response one-fourth mark would be deducted.

Category 2:

1. There are 5 questions numbered from 31 to 35.
2. Out of four options only one option was correct.
3. For each incorrect response one-fourth mark (1/2 mark) would be deducted.

Category 3:

1. There are 5 questions numbered from 36 to 40.
2. More than one option may be correct and marking of all correct options only would yield two marks.
3. For any combination of answers containing one or more incorrect responses, net mark awarded will be zero
4. For partially correct response without any incorrect marking:

Marks awarded = 2 × (no of correct responses) / (total no of correct options)

Few sample questions from the Solved Physics Practice Paper are given below:

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 perpendicular to the plane and away from the plane

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

(c) Directed radially away from the point charge

(d) Directed radially towards the point charge

Sol. (a)

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 developes on opposite side of the plane. This process is called charging by induction.

Question:

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

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

(b) Radiates energy but its velocity is unchanged.

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

(d) Radiates energy with the change of velocity.

Sol. (c)

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:

An object approaches a convergent lens from the left of the lens with a uniform speed 5 m/s and stops at the focus. The image

(a) Moves away from the lens with an uniform speed 5 m/s

(b) Moves away from the lens with an uniform acceleration

(c) Moves away from the lens with a non-uniform acceleration

(d) Moves towards the lens with a non-uniform acceleration

Sol. (c)

When an object approaches a convergent lens from the left of the lens with a uniform speed of 5 m/s, the image away from lens with a non-uniform acceleration.

Question:

A positively charged particle is released from rest in an 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 along the electric field

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

Sol. (c)

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:

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.

Conclusion:

This solved practice paper will help the students in their final level of preparation. It will help the students to understand the pattern and difficulty level of the examination. Detailed solution of each question has been provided to save precious time of students.