
CBSE Important Questions›

CBSE Previous Year Question Papers›
 CBSE Previous Year Question Papers
 CBSE Previous Year Question Papers Class 12
 CBSE Previous Year Question Papers Class 10

CBSE Revision Notes›

CBSE Syllabus›

CBSE Extra Questions›

CBSE Sample Papers›
 CBSE Sample Papers
 CBSE Sample Question Papers For Class 5
 CBSE Sample Question Papers For Class 4
 CBSE Sample Question Papers For Class 3
 CBSE Sample Question Papers For Class 2
 CBSE Sample Question Papers For Class 1
 CBSE Sample Question Papers For Class 12
 CBSE Sample Question Papers For Class 11
 CBSE Sample Question Papers For Class 10
 CBSE Sample Question Papers For Class 9
 CBSE Sample Question Papers For Class 8
 CBSE Sample Question Papers For Class 7
 CBSE Sample Question Papers For Class 6

ISC & ICSE Syllabus›

ICSE Question Paper›
 ICSE Question Paper
 ISC Class 12 Question Paper
 ICSE Class 10 Question Paper

ICSE Sample Question Papers›
 ICSE Sample Question Papers
 ISC Sample Question Papers For Class 12
 ISC Sample Question Papers For Class 11
 ICSE Sample Question Papers For Class 10
 ICSE Sample Question Papers For Class 9
 ICSE Sample Question Papers For Class 8
 ICSE Sample Question Papers For Class 7
 ICSE Sample Question Papers For Class 6

ICSE Revision Notes›
 ICSE Revision Notes
 ICSE Class 9 Revision Notes
 ICSE Class 10 Revision Notes

ICSE Important Questions›

Maharashtra board›

RajasthanBoard›
 RajasthanBoard

Andhrapradesh Board›
 Andhrapradesh Board
 AP Board Sample Question Paper
 AP Board syllabus
 AP Board Previous Year Question Paper

Telangana Board›

Tamilnadu Board›

NCERT Solutions Class 12›
 NCERT Solutions Class 12
 NCERT Solutions Class 12 Economics
 NCERT Solutions Class 12 English
 NCERT Solutions Class 12 Hindi
 NCERT Solutions Class 12 Maths
 NCERT Solutions Class 12 Physics
 NCERT Solutions Class 12 Accountancy
 NCERT Solutions Class 12 Biology
 NCERT Solutions Class 12 Chemistry
 NCERT Solutions Class 12 Commerce

NCERT Solutions Class 10›

NCERT Solutions Class 11›
 NCERT Solutions Class 11
 NCERT Solutions Class 11 Statistics
 NCERT Solutions Class 11 Accountancy
 NCERT Solutions Class 11 Biology
 NCERT Solutions Class 11 Chemistry
 NCERT Solutions Class 11 Commerce
 NCERT Solutions Class 11 English
 NCERT Solutions Class 11 Hindi
 NCERT Solutions Class 11 Maths
 NCERT Solutions Class 11 Physics

NCERT Solutions Class 9›

NCERT Solutions Class 8›

NCERT Solutions Class 7›

NCERT Solutions Class 6›

NCERT Solutions Class 5›
 NCERT Solutions Class 5
 NCERT Solutions Class 5 EVS
 NCERT Solutions Class 5 English
 NCERT Solutions Class 5 Maths

NCERT Solutions Class 4›

NCERT Solutions Class 3›

NCERT Solutions Class 2›
 NCERT Solutions Class 2
 NCERT Solutions Class 2 Hindi
 NCERT Solutions Class 2 Maths
 NCERT Solutions Class 2 English

NCERT Solutions Class 1›
 NCERT Solutions Class 1
 NCERT Solutions Class 1 English
 NCERT Solutions Class 1 Hindi
 NCERT Solutions Class 1 Maths

JEE Main Question Papers›

JEE Main Syllabus›
 JEE Main Syllabus
 JEE Main Chemistry Syllabus
 JEE Main Maths Syllabus
 JEE Main Physics Syllabus

JEE Main Questions›
 JEE Main Questions
 JEE Main Maths Questions
 JEE Main Physics Questions
 JEE Main Chemistry Questions

JEE Main Mock Test›
 JEE Main Mock Test

JEE Main Revision Notes›
 JEE Main Revision Notes

JEE Main Sample Papers›
 JEE Main Sample Papers

JEE Advanced Question Papers›

JEE Advanced Syllabus›
 JEE Advanced Syllabus

JEE Advanced Mock Test›
 JEE Advanced Mock Test

JEE Advanced Questions›
 JEE Advanced Questions
 JEE Advanced Chemistry Questions
 JEE Advanced Maths Questions
 JEE Advanced Physics Questions

JEE Advanced Sample Papers›
 JEE Advanced Sample Papers

NEET Eligibility Criteria›
 NEET Eligibility Criteria

NEET Question Papers›

NEET Sample Papers›
 NEET Sample Papers

NEET Syllabus›

NEET Mock Test›
 NEET Mock Test

NCERT Books Class 9›
 NCERT Books Class 9

NCERT Books Class 8›
 NCERT Books Class 8

NCERT Books Class 7›
 NCERT Books Class 7

NCERT Books Class 6›
 NCERT Books Class 6

NCERT Books Class 5›
 NCERT Books Class 5

NCERT Books Class 4›
 NCERT Books Class 4

NCERT Books Class 3›
 NCERT Books Class 3

NCERT Books Class 2›
 NCERT Books Class 2

NCERT Books Class 1›
 NCERT Books Class 1

NCERT Books Class 12›
 NCERT Books Class 12

NCERT Books Class 11›
 NCERT Books Class 11

NCERT Books Class 10›
 NCERT Books Class 10

Chemistry Full Forms›
 Chemistry Full Forms

Biology Full Forms›
 Biology Full Forms

Physics Full Forms›
 Physics Full Forms

Educational Full Form›
 Educational Full Form

Examination Full Forms›
 Examination Full Forms

Algebra Formulas›
 Algebra Formulas

Chemistry Formulas›
 Chemistry Formulas

Geometry Formulas›
 Geometry Formulas

Math Formulas›
 Math Formulas

Physics Formulas›
 Physics Formulas

Trigonometry Formulas›
 Trigonometry Formulas

CUET Admit Card›
 CUET Admit Card

CUET Application Form›
 CUET Application Form

CUET Counselling›
 CUET Counselling

CUET Cutoff›
 CUET Cutoff

CUET Previous Year Question Papers›
 CUET Previous Year Question Papers

CUET Results›
 CUET Results

CUET Sample Papers›
 CUET Sample Papers

CUET Syllabus›
 CUET Syllabus

CUET Eligibility Criteria›
 CUET Eligibility Criteria

CUET Exam Centers›
 CUET Exam Centers

CUET Exam Dates›
 CUET Exam Dates

CUET Exam Pattern›
 CUET Exam Pattern
Class 11 Physics Chapter 4 Important Questions
Important Questions for CBSE Class 11 Physics Chapter 4 – Motion in a Plane
For exam preparation, students can refer to Important Questions for Class 11 Physics Chapter 4 because these questions are organised by important topics and marks distribution. These questions are constructed by subject matter experts in accordance with the CBSE Syllabus. Students can revise the main topics of the chapter with the stepbystep solutions provided with these questions.
Chapter 4 Class 11 Physics Important Questions are a set of questions based on the concepts, terminologies, formulae, and numericals related to “Motion in a Plane”. On the Extramarks website, these questions are easily available, which can help students save time during exam preparations.
CBSE Class 11 Physics Chapter 4 Important Questions
Study Important Questions for Class 11 Physics Chapter 4 – Motion in a Plane
Students can preview the set of Class 11 Physics Chapter 4 Important Questions given below. They can also click on the link provided to access CBSE Extra Questions for the main topics of Chapter 4 Motion in a Plane of Class 11 Physics.
Very Short Answers and Questions
[1 – 2 Marks]
Q1. A stone is thrown vertically upwards, and then it returns to the thrower. Is it a projectile? Justify.
Ans: In this scenario, the stone has only one direction of velocity when rising or falling. Furthermore, a projectile shall comprise two perpendicular components of velocity. Therefore, a stone thrown vertically upwards is not considered to be a projectile.
Q2. At the highest point of the trajectory, what makes the direction of motion of a projectile go horizontal?
Ans: The projectile’s direction of motion changes to horizontal at the highest point of the trajectory as the velocity vertical component turns zero.
Q3. When the initial velocity is increased twofold and the angle of projection is constant, how will the horizontal range of a projectile be affected?
Ans: The horizontal range will increase by four times in comparison to the initial horizontal range.
Q4. Select the vector quantity in the list mentioned below.
Time, temperature, energy, gravitational potential, pressure, power, impulse, charge, coefficient of friction, and total path length.
Ans: Impulse is the vector quantity in the preceding lists. The force is a vector quantity, as its product with time (a scalar quantity) results in a vector quantity. Hence, the impulse is the product of force and time.
Q5. A stone tied at the end of the string is whirled in a circle. State the reason why the stone flies away tangentially when the string breaks.
Ans: When a stone is tied at the end of a string that moves in a circular path, its velocity is tangent to the circle. The centripetal force does not work when the string breaks. The stone moves along the tangent to the circular path and flies away tangentially due to inertia.
Q6. What does “uniform circular motion” mean? What do you mean by the terms ‘time period’, ‘frequency’, and ‘angular velocity’? Explain the relationship between them.
Ans: The motion is considered to be a uniform circular motion when an object rotates in a circular path with the same speed.
The total time taken by the object to complete one revolution is considered a time period.
The total number of revolutions completed per second is termed “frequency.”
The angular velocity is defined as the time rate of transformation of angular displacement.
=2T=2
1T=, which is the required relation.
Q7. A man can swim with a speed of 4.0 km/h in still water. How long does it take to cross a river 1km/h wide if the river flows steadily at 3.0km/h and he makes his strokes normal to the river current? How far down the river does he go when he reaches the other bank?
Ans. The speed of the man is given as m=4.0km/h
Width of the river is given as 1km/h
Total time needed to cross the river =width of the riverspeed of the river
Time needed to cross the river =14h
=1460
=15 min
Speed of the river, r=3 km/h
Distance covered with the flow of the river rt
314=34
341000=750m, which is the required distance.
Q8. a) A vector has both magnitude and direction. From this statement, can we conclude that anything that has magnitude and direction is a vector?
Ans: No, a physical quantity having both magnitude and direction is not necessarily a vector.
For example, regardless of its magnitude and direction, the current is a scalar quantity. Any physical quantity must follow the law of vector addition to be considered a vector.
Q8. b) The rotation of a body can be specified by the direction of the axis of rotation, and the angle of rotation about the axis. Does it lead to any rotation of a vector?
Ans: No.
As the law of vector addition is not followed, the rotation of a body across an axis is not considered to be a vector quantity.
Short Answers and Questions
[3 – 4 Marks]
Q1. a)Define time of flight and horizontal range?
Ans: The time of flight is the time required by the projectile to finish its trajectory.
The horizontal range is the maximum horizontal distance travelled by the projectile from the bottom of the tower to the point the projectile touches the ground.
Q1. b) From a certain height above the ground, stone A is gently dropped. Simultaneously, another stone, B, is fired horizontally. Which of the two stones will touch the ground first?
Ans: Because the initial vertical velocity in both scenarios is zero, and the stones fall with a similar acceleration equal to gravity’s acceleration. Therefore, both stones will simultaneously touch the ground.
Q2. The ceiling of a long hall is 25m high. What is the maximum horizontal distance that a ball thrown with a speed of 40m/s can go without hitting the ceiling of the hall?
Ans. Given that,
Speed of the ball is given as, =40m/s
Maximum height is given as, h=25m
In projectile motion, the maximum height attained by a body projected at an angle , is given by the formula:
h=u2sin22g
25=40229.8
sin2=0.30625
sin=0.5534
=sin1(0.5534)=33.60°
Horizontal Range,
R=u2sin2g
R=402 sin2(33.60)9.8
R=1600 sin(67.2)9.8
R=1600 0.9229.8=150.53m
Q3. Derive expressions for velocity and acceleration for uniform circular motion.
Ans. We can write,
If PQ=l,
V=lt
And angular velocity can be given as
=l
Using, =lr,
=lr ………….(1)
l=Vt and =t
Substituting in (1)
t=V tr
V=r, which is the required expression for velocity.
Also,
a=dVdt=rddt=drdt=V=VrV=V2r
a=V2r, which is the required expression for acceleration.
Long Answers and Questions
[5 – 6 Marks]
Q1. A particle starts from the origin at t=0s with a velocity of 10 ĵm/s and moves in the xy plane with a constant acceleration of 8î+2ĵm/s2.
 a) At what time is the xcoordinate of the particle 16m? What is the ycoordinate of the particle at that time?
Ans. The velocity of the particle is given as =10 ĵm/s
Acceleration of the particle is given as a=ddt=8î+2ĵ
Also, a=8î+2ĵ
But,
a=ddt=8î+2ĵ
d=8î+2ĵdt
Integrating both sides:
(t)=8tî+2tĵ+u
Where,
= Velocity vector of the particle at t = 0
u= Velocity vector of the particle at time t
However,
=drdt
=dt=(8tî+2tĵ+u)dt
Integrating the equations with the conditions: at t=0; r=0 and at t=t; and
r=r
r=ut+128t2î+122t2ĵ
r=ut+4t2î+t2ĵ
=(10ĵ)t+4t2î+t2ĵ
xî+yĵ=4t2î+(10t+t2)ĵ
Since the motion of the particle is confined to the xy plane, on equating the coefficients of î and ĵ we get,
x=4t2
t=x412
And y=10t+t2
When x=16m:
t=16412=2s, which is the required time.
y=102+22=24m, which is the required y coordinate.
 b) What is the speed of the particle at the time?
Ans: Velocity of the particle can be given by:
(t)=8tî+2tĵ+u
At t=2s
(2)=8(2)î+2(2)ĵ+10ĵ
=16î+14ĵ
=162+142
=256+196
=452
=21.26m/s, which is the required speed.
Download Important Questions for Class 11 Physics Chapter 4
A set of questionnaires is constructed for students to get a better understanding of the Chapter 4 of Class 11 Physics. These questions are easily accessible on the Extramarks website.
Class 11 Physics Chapter 4 Important Questions
Motion in a Plane Class 11 Important Questions
Class 11 Physics Chapter 4 Important Questions cover various topics such as the following.
 The basic concepts of scalars and vectors
 The displacement and acceleration
 Multiplication of vectors
 Uniform circular motion
 Concepts of projectile motion
 Threedimensional motion in a plane
 Addition and subtraction of vector
Why go for Extramarks?
Extramarks provides comprehensive study material which includes numericals, concepts, reasonbased questions, etc. Students can directly access these reliable materials from the website while preparing for the exams. This set of questionnaires are made by the subject matter experts at Extramarks.
Conclusion
Students can refer to Class 11 Physics Chapter 4 Important Questions as it will help them cover all the important topics while revising the chapter.
Q.1 Read the assertion and reason carefully to mark the correct option out of the options given below.
Assertion: The resultant of three vectors cannot be zero if they are coplanar.
Reason: The three unequal vectors should form a polygon to give zero resultant vector.
Assertion is true but reason is false.
Assertion and reason both are false.
Both assertion and reason are true and the reason is the correct explanation of the assertion.
Both assertion and reason are true but reason is not the correct explanation of the assertion.
Marks:1
Ans
For getting a zeroresultant vector, the three vectors can be arranged in a polygon. If three vectors are coplanar then their resultant vector can be zero, that is when the resultant of two of them is equal in magnitude and opposite to the direction of the third vector.
Q.2 If an angle of projection of a projectile is 90°, then the horizontal range, R is
zero.
infinite.
onefourth of its maximum height.
four times its maximum height.
Marks:1
Ans
zero.
Q.3 A bullet fired from a rifle attains a maximum height of 5 m and a range of 200 m. The angle of projection is
6^{o}43′
5^{o}43′
4^{o}43′
5^{o}53′
Marks:1
Ans
Q.4
<– [if gtevml 1]> <[endif]–><– [ifgtemso 9]><[endif]–>
Marks:2
Ans
Q.5 A body is revolving in a circle of diameter 0.40 m at the rate of 1000 revolutions/ minute. Calculate its linear velocity and centripetal acceleration.
Marks:3
Ans
Please register to view this section
FAQs (Frequently Asked Questions)
1. Explain linear motion.
A onedimensional motion across a straight line that uses only one spatial dimension is considered to be a linear motion. This motion is also called a rectilinear motion. Uniform linear motion with a constant velocity and zero acceleration and nonuniform linear motion with a variable velocity and nonzero acceleration are the two most evident types of linear motion. It is the most basic of all the motions. Linear motion is considered to be nearly similar to general motion. The rolling of the ball on the ground is an example of linear motion.
2. A passenger arriving in a new town wants to go from the station to a hotel located 10km away on a straight road from the station. A dishonest cabman takes him along a circuitous path 23km long and reaches the hotel in 28 min. (a) What is the average speed of the taxi? (b) What is the magnitude of average velocity? Are the two equal?
(a) Total distance travelled =23km
Total time taken = 28 min=2860h
Therefore,
Average speed =Total distance travelledTotal time taken
=23286049.29km/h
(b) Distance between the hotel and the station =10km= Displacement of the car
Therefore,
Average velocity =102860=21.34km/h
The two physical quantities are not equal.
3. After carefully reading each statement below and providing appropriate reasons, state whether it is true or false. (a) The acceleration vector of a particle in uniform circular motion averaged over one cycle is a null vector. (b) The net acceleration of a particle in a circular motion is always along the radius of the circle towards the centre. (c) The velocity vector of a particle at a point is always along the tangent to the path of the particle at that point.
(a) True
The acceleration vector direction faces toward the centre of the circle in a uniform circular motion. Later, it frequently changes with time, and over one cycle, the average of these vectors is a null vector.
(b) False
In a uniform circular motion, a particle’s net acceleration in circular motion is always guided across the radius of the circle, pointing to the centre.
(c) True
A particle visibly moves tangentially at a point on a circular path.