NCERT / Physics / Ch.2

Motion in a Straight Line

Displacement · Speed & Velocity · Acceleration · Graphs · Free Fall · Stopping Distance
MCQ Master Series — 50 expert questions across 3 difficulty tiers.

⚡ Start Quiz 📊 Analytics
50
Questions
5
Topics
30
Concept Check (NCERT)
15
Boards / JEE Main Level
5
JEE/NEET Edge / HOTS
Question Intelligence

Quiz Analytics

A data-driven breakdown of all 50 questions by difficulty, exam origin and topic distribution.

📈 Distribution Overview

50
Total Questions
Concept Check (NCERT)
30
Boards / JEE Main Level
15
JEE/NEET Edge / HOTS
5

🗂 Topic Coverage

Basics: Distance, Displacement, Speed, Velocity
28%
Acceleration & Kinematic Equations
32%
Graphical Interpretation (x–t & v–t)
20%
Free Fall & g, Galileo’s Results
12%
Reaction, Braking & Stopping Distance
8%
30
Concept Check (NCERT)
15
Boards / JEE Main Level
5
JEE/NEET Edge / HOTS
Conceptual Framework

Key Concept Highlights

6 foundational pillars that power every question in this quiz. Understand these, and the answers follow naturally.

📍
Distance vs Displacement
Distance is the total path length and is always non‑negative, while displacement is a vector joining initial and final positions and can be positive, negative or zero.
🚗
Speed & Velocity
Speed is a scalar that tells how fast an object moves, whereas velocity combines speed with direction, making it a vector essential for describing straight‑line motion.
⚡
Acceleration & Retardation
Acceleration measures how quickly velocity changes with time; a negative value indicates retardation or deceleration when the object slows down along its line of motion.
📈
Motion Graphs
The slope of a displacement–time graph gives velocity and the slope of a velocity–time graph gives acceleration, while the area under a v–t graph represents displacement.
🌍
Free Fall & g
In free fall near Earth’s surface, all bodies experience the same constant acceleration due to gravity, approximately \(9.8\,\text{m s}^{-2}\), irrespective of their masses.
🛑
Reaction, Braking & Stopping
Stopping distance is the sum of reaction distance and braking distance; it grows rapidly with speed, so small increases in speed can greatly increase the distance needed to stop safely.
Pedagogical Value

Why MCQs Matter

Multiple-choice questions are not mere guessing games — they are the sharpest diagnostic tool available to a competitive exam aspirant.

WHY
  • Force precise recall — vague conceptual understanding gets exposed immediately
  • Train elimination logic, a critical skill in JEE where partial knowledge suffices
  • Mirror CBSE Board objective and JEE Main Paper 1 formats exactly
  • Build decisive exam temperament — no room for hesitation
  • Reveal misconceptions that long-answer formats often mask
  • Provide instant feedback loops for targeted revision
~8–10%

of Class XI Mechanics weightage via displacement, speed & velocity, acceleration, motion graphs, free fall and stopping distance in Boards & JEE/NEET.

Quick Reference

Important Formula Capsules

10 must-memorise equations that surface repeatedly across CBSE and JEE papers.

Average Velocity
\[ v_{avg} = \dfrac{\Delta x}{\Delta t} \]
Instantaneous Velocity
\[ v = \dfrac{dx}{dt} \]
Average Acceleration
\[ a_{avg} = \dfrac{v - u}{\Delta t} \]
Instantaneous Acceleration
\[ a = \dfrac{dv}{dt} \]
First Equation of Motion
\[ v = u + at \]
Second Equation of Motion
\[ s = ut + \tfrac12 at^{2} \]
Third Equation of Motion
\[ v^{2} = u^{2} + 2as \]
nth Second Distance (u=0)
\[ s_{n} = \tfrac12 a(2n - 1) \]
Free Fall with Initial Rest
\[ s = \tfrac12 g t^{2} \]
Stopping Distance (Model)
\[ S = v t_{r} + \dfrac{v^{2}}{2a} \]
Learning Outcomes

What You Will Learn

By completing this quiz set you will have exercised all the following competencies.

01 Classify given quantities as scalar or vector and identify which are always non‑negative, such as distance and speed, in straight‑line motion problems.
02 Use the definitions and units of displacement, velocity and acceleration to decide whether motion is uniform or non‑uniform from verbal descriptions and data.
03 Apply the three kinematic equations to solve for displacement, velocity, acceleration and time in uniformly accelerated motion, including cases with zero acceleration.
04 Interpret displacement–time and velocity–time graphs to obtain slopes, areas and physical meaning, and recognise signatures of rest, uniform motion and uniform acceleration.
05 Analyse free‑fall motion using constant acceleration due to gravity, law of odd numbers and distances in successive seconds for both board and entrance‑level questions.
06 Relate reaction time, reaction distance, braking distance and stopping distance, and predict how changes in speed or acceleration affect overall stopping distance.
Exam Preparation

Strategy & Preparation Tips

5 evidence-based strategies to maximise your score in CBSE Boards and JEE.

01
Strategy
Lock in Definitions & Units
Memorise crisp definitions of displacement, velocity, acceleration and their SI units; many one‑mark and concept‑check MCQs directly test these basics.
02
Strategy
Think Graphs, Not Just Formulas
For questions on “which graph” or “which motion”, immediately sketch x–t and v–t graphs and use slope and area ideas instead of plugging blindly into equations.
03
Strategy
Use Sign Conventions Consistently
Choose a positive direction once for each problem and stick to it; interpret negative velocity or acceleration carefully to avoid sign errors in MCQs.
04
Strategy
Exploit nth Second & Odd Numbers
Practise nth‑second distance and Galileo’s law of odd numbers so you can handle “first second vs next second” style questions very quickly.
05
Strategy
Relate Everyday Driving to Physics
Connect reaction time, reaction distance and braking distance to real driving situations; this makes conceptual questions on stopping distance almost intuitive.

Ready to Test Your Mastery?

50 questions  ·  Elapsed timer  ·  Instant scored results

⚡ Begin Motion in a Straight Line Quiz
🎯 Knowledge Check

Physics — MOTION IN A STRAIGHT LINE

50 Questions Class 11 MCQs
1
Which of the following quantities is always non-negative?
2
The SI unit of velocity is:
3
If a body covers equal distances in equal intervals of time, it is said to have:
4
Which of the following is a vector quantity?
5
The slope of a displacement–time graph represents:
6
The area under a velocity–time graph gives:
7
A body is said to be in uniform acceleration if:
8
Which equation represents uniformly accelerated motion?
9
If acceleration is zero, which quantity remains constant?
10
A car moving with constant speed in a straight line has:
11
Instantaneous velocity is defined as:
12
The SI unit of acceleration is:
13
A negative acceleration indicates:
14
Which of the following motions is an example of free fall?
15
At the highest point of vertical motion, the acceleration is:
16
The value of acceleration due to gravity near Earth’s surface is approximately:
17
Galileo’s law of odd numbers applies to:
18
The distances covered in successive seconds under uniform acceleration are proportional to:
19
Reaction time depends mainly on:
20
Reaction distance is directly proportional to:
21
Braking distance of a vehicle varies as:
22
The stopping distance of a vehicle is the sum of:
23
A horizontal velocity–time graph indicates:
24
The slope of a velocity–time graph gives:
25
If \( v^2 = u^2 + 2as \), then acceleration is:
26
A body thrown vertically upward returns to the point of projection in:
27
Which graph represents uniformly accelerated motion?
28
A particle moving with constant acceleration has:
29
If initial velocity is zero, the distance travelled in time \( t \) is:
30
Which quantity can be zero even when the body is moving?
31
The motion of an elevator moving upward with decreasing speed has acceleration:
32
The displacement of a body in uniform motion is directly proportional to:
33
If a body has constant speed but changing direction, it has:
34
The dimensional formula of acceleration is:
35
Which motion has maximum stopping distance at the same speed?
36
A particle starts from rest and moves with acceleration \( a \). Distance covered in the nth second is:
37
If velocity is proportional to time, the motion has:
38
A velocity–time graph is a straight line parallel to time axis. Acceleration is:
39
A body thrown upward has acceleration:
40
If speed is doubled, braking distance becomes:
41
A body moving with constant acceleration covers distances \( s_1 \) and \( s_2 \) in first and second seconds. Then \( s_2 - s_1 \) equals:
42
Which equation is independent of time?
43
If a particle’s velocity changes sign, it means:
44
The reaction time of a driver mainly affects:
45
A stone is dropped from rest. Distance covered in first second is \( s \). Distance covered in next second is:
46
Which quantity remains same for all freely falling bodies?
47
If displacement is zero, which quantity must be zero?
48
A particle moves such that \( x = t^2 \). Its acceleration is:
49
A body comes to rest from speed \( u \) with uniform retardation in distance \( s \). Retardation is:
50
Which of the following best explains importance of kinematics?
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Frequently Asked Questions

Motion is the change in position of an object with time relative to a chosen reference point.

It is motion where an object moves along a single straight path, also called one-dimensional motion.

A reference point is a fixed point relative to which the position and motion of an object are described.

Yes, rest and motion depend on the observer’s frame of reference.

Distance is the total length of the actual path travelled by an object, irrespective of direction.

Displacement is the shortest straight-line distance between initial and final positions, with direction.

Because it has both magnitude and direction.

Yes, when an object returns to its starting point.

Speed is the rate at which distance is covered with time.

Velocity is the rate of change of displacement with time and includes direction.

Speed is scalar; velocity is vector and depends on direction.

Average speed is total distance travelled divided by total time taken.

Average velocity is total displacement divided by total time.

When motion is along a straight line without change in direction.

Velocity of an object at a particular instant of time.

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