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NEET • PHYSICS • MOTION IN A STRAIGHT LINE

Motion in a straight line practice · Medium

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Showing 1-30 of 106 questions

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1 Medium
1 of 106
Understanding +4 | -1
Velocity-time curve for a body projected vertically upwards is
View answer and explanation
Correct option: D
Straight line
Option D (Straight line) is correct because the velocity changes linearly with time due to constant acceleration (gravity).
2 Medium
2 of 106
Understanding +4 | -1
Two cars A and B approach each other at the same speed, then what will be the velocity of A if velocity of B is 8 m/s8 \mathrm{~m} / \mathrm{s}?
View answer and explanation
Correct option: C
−8 m/s-8 \mathrm{~m} / \mathrm{s}
Option C (-8 m/s) is correct. Since the cars approach each other at the same speed, if the velocity of B is 8 m/s, the velocity of A must be -8 m/s, considering opposite directions.
3 Medium
3 of 106
Application +4 | -1
Two cars are moving in the same direction with a speed of 30kmh−130\mathrm{km}{\mathrm{h}^{ - 1}}. They are separated from each other by 5 km. Third car moving in the opposite direction meets the two cars after an interval of 4 min. What is the speed of the third car?
View answer and explanation
Correct option: D
45kmh−1\mathrm{45km}{\mathrm{h}^{ - 1}}
Option D (45kmh−1\mathrm{45km}{\mathrm{h}^{ - 1}}) is correct because it is calculated by using the concept of relative speed and the given time interval.
4 Medium
4 of 106
Analyzing +4 | -1
Which of the following 4 statements is false
View answer and explanation
Correct option: B
A body can have a constant velocity and still have a varying speed
Option B (A body can have a constant velocity and still have a varying speed) is false because constant velocity implies constant speed and direction.
5 Medium
5 of 106
Analyzing +4 | -1
Assertion: If two particles are moving with same speed but their velocity vectors are opposite, then the distance between the particles must be changing.
Reason: If the velocity of one particle w.r.t. other is zero, then separation between the particle must be constant.
View answer and explanation
Correct option: B
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
Option B (If both Assertion and Reason are true but Reason is not the correct explanation of Assertion) is correct because both statements are true, but the reason does not explain the assertion.
6 Medium
6 of 106
Application +4 | -1
An object accelerates from rest to a velocity 27.5  ms−127.5\;\mathrm{m}{\mathrm{s}^{ - 1}} in 10 s, then the distance covered after next 10 s is
View answer and explanation
Correct option: C
412.5 m
Option C (412.5 m) is correct because it is calculated by first finding the acceleration and then using the kinematic equation for distance with constant velocity.
7 Medium
7 of 106
Understanding +4 | -1
The ratio of the numerical values of the average velocity and average speed of a body is always
View answer and explanation
Correct option: B
Unity or less
Option B (Unity or less) is correct because the magnitude of average velocity is always less than or equal to the average speed.
8 Medium
8 of 106
Understanding +4 | -1
The distance travelled by a body is directly proportional to the time taken. Its speed
View answer and explanation
Correct option: D
Remains constant
Option D (Remains constant) is correct because if distance is directly proportional to time, the speed is constant.
9 Medium
9 of 106
Analyzing +4 | -1
A particle moves along a straight line such that its position x at any time t is x=6t2−t3.x = 6{t^2} - {t^3}.. Where x in metre and t is in second, then
View answer and explanation
Correct option: D
Both (1) and (2) are correct
Option D (Both (1) and (2) are correct) is correct because at t=0 the acceleration is indeed 12 m/s², and the x-t curve has a maximum at t=4s.
10 Medium
10 of 106
Analyzing +4 | -1
The velocity of a particle depends upon the time t\mathrm{t} according to the equation: v=ab+bt+cd+t\mathrm{v}=\sqrt{\mathrm{a b}}+\mathrm{b t}+\frac{\mathrm{c}}{\mathrm{d+t}}. The physical quantities which are represented by a,b,c\mathrm{a, b, c} and d\mathrm{d}, are in the following order:
View answer and explanation
Correct option: B
Distance, acceleration, distance, time
Option B (Distance, acceleration, distance, time) is correct because, based on dimensional analysis, 'a' must represent distance, 'b' must represent acceleration, 'c' must represent distance, and 'd' must represent time to maintain consistent units for velocity.
11 Medium
11 of 106
Application +4 | -1
An athlete completes one round of a circular track or radius R in 40 sec. What will be his displacement at the end of 2 min. 20 sec
View answer and explanation
Correct option: B
2R
Option B (2R) is correct because after 2 minutes and 20 seconds, the athlete completes 3.5 rounds, ending up diametrically opposite the starting point, hence the displacement is 2R.
12 Medium
12 of 106
Understanding +4 | -1
Two balls of same size but the density of one is greater than that of the other are dropped from the same height, then which ball will reach the earth first (air resistance is negligible)?
View answer and explanation
Correct option: C
Both simultaneously
Option C (Both simultaneously) is correct because in the absence of air resistance, the acceleration due to gravity is the same for all objects, regardless of their mass or density.
13 Medium
13 of 106
Application +4 | -1
A bomb is dropped from an aeroplane flying horizontally with a velocity of 720 kmph at an altitude of 980 m. Time taken by the bomb to hit the ground is
View answer and explanation
Correct option: C
14.14 S
Option C (14.14 S) is correct because it calculates the time it takes for the bomb to fall from a height of 980m under the influence of gravity, independent of its horizontal velocity.
14 Medium
14 of 106
Application +4 | -1
The displacement of the particle varies with time according to the relation x=kb[1−e−bt].x = \frac{k}{b}\left[ {1 - {e^{ - bt}}} \right]. Then the velocity of the particle is
View answer and explanation
Correct option: A
k(e−bt)k\left( {{e^{ - bt}}} \right)
Option A (k(e−bt)k\left( {{e^{ - bt}}} \right)) is correct because it represents the derivative of the given displacement function with respect to time, which gives the velocity.
15 Medium
15 of 106
Understanding +4 | -1
A particle comes round a circle of radius 1 m once. The time taken by it is 10 sec. The average velocity of motion is
View answer and explanation
Correct option: D
Zero
Option D (Zero) is correct because average velocity is defined as the total displacement divided by the total time, and in one complete circle, the displacement is zero.

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16 Medium
16 of 106
Understanding +4 | -1
Consider the motion of the tip of the minutes hand of a clock. In one hour
I. The displacement is zero
II. The distance covered is zero
III. The average speed is zero
IV. The average velocity is zero
View answer and explanation
Correct option: C
A and D are correct
Option C (A and D are correct) is correct because in one hour, the minute hand completes a full circle, returning to its starting point, making the displacement and average velocity zero. The distance covered and average speed are non-zero.
17 Medium
17 of 106
Understanding +4 | -1
A man projects a coin upwards from the gate of a uniformly moving train. The path of coin for the man will be
View answer and explanation
Correct option: C
vertical straight line
Option C (vertical straight line) is correct because, relative to the man, the coin only moves vertically due to gravity.
18 Medium
18 of 106
Application +4 | -1
A particle is moving in a straight line with velocity (v) = (t – 4) m/s. What is the average speed between t = 0 to t = 8 second?
View answer and explanation
Correct option: C
2 ms−12\,m{s^{ - 1}}
Option C (2 m/s) is correct because it is the total distance traveled divided by the total time, considering the change in direction.
19 Medium
19 of 106
Analyzing +4 | -1
A stone projected upwards with a velocity ‘u’ reaches two points P and Q separated by a distance ‘h’ with velocities u/2 and u/3. The maximum height reached by it is
View answer and explanation
Correct option: C
36h5\frac{{36h}}{5}
Option C (36h5\frac{{36h}}{5}) is correct because it is derived from using kinematic equations and solving for the maximum height.
20 Medium
20 of 106
Understanding +4 | -1
Speed is in general _____ in magnitude than that of the velocity.
View answer and explanation
Correct option: B
Greater or equal
Option B (Greater or equal) is correct because speed is the magnitude of velocity and can be equal to or greater than the magnitude of velocity if the direction changes.
21 Medium
21 of 106
Analyzing +4 | -1
Statement-I: The average velocity of a particle is zero in a time interval. It is possible that the instantaneous acceleration is never zero in the interval.
Statement-II: The magnitude of average velocity in an interval is equal to its average speed in that interval.
View answer and explanation
Correct option: B
Statement-I is true, statement-II is false
Option B (Statement-I is true, statement-II is false) is correct because it is possible for the average velocity to be zero while instantaneous acceleration is non-zero, and the magnitude of average velocity is not always equal to average speed.
22 Medium
22 of 106
Analyzing +4 | -1
Which of the following are true?
(i) A body having constant speed can have verying velocity.
(ii) Position-time graphs for two objects with zero relative velocity are parallel.
(iii) The numerical ration of velocity to speed of an object can never be more than one.
View answer and explanation
Correct option: C
All
All. All statements are correct: constant speed can have varying velocity (circular motion), zero relative velocity implies parallel position-time graphs, and the ratio of velocity to speed cannot exceed one.
23 Medium
23 of 106
Application +4 | -1
A body dropped from a height h with an initial speed zero, strikes the ground with a velocity 3 km/h . Another body of same mass is dropped from the same height h with an initial speed u = 4 km/h. Find the final velocity of second body with which it strikes the ground
View answer and explanation
Correct option: C
5 km/h
Option D (Go on increasing with time) is correct because the velocity function derived from the displacement function shows an increasing exponential term.
24 Medium
24 of 106
Understanding +4 | -1
Two stones of equal masses are dropped from a rooftop of height h one after another. Their separation distance against time will
View answer and explanation
Correct option: B
Increase
Option B (Increase) is correct because the separation distance between the stones increases with time due to the increasing velocity difference between them.
25 Medium
25 of 106
Application +4 | -1
A body starts from rest, with uniform acceleration. If its velocity after n seconds is v,then its displacement in the last two seconds is
View answer and explanation
Correct option: D
2v(n−1)n\frac{{2v\left( {n - 1} \right)}}{n}
Option D (2v(n−1)n\frac{{2v\left( {n - 1} \right)}}{n}) is correct because it calculates the displacement in the last two seconds based on uniform acceleration and the final velocity after n seconds.
26 Medium
26 of 106
Understanding +4 | -1
A particle is constrained to move on a straight line path. It returns to the starting point after 10 sec. The total distance covered by the particle during this time is 30 m. Which of the following statement about the motion of the particle is false
View answer and explanation
Correct option: C
Displacement of the particle is 30 m
Option C (Displacement of the particle is 30 m) is false because the particle returns to the starting point, making the displacement zero.
27 Medium
27 of 106
Understanding +4 | -1
Choose the wrong statement from the following.
View answer and explanation
Correct option: B
The speed in general is less than the magnitude of the velocity
Option B (The speed in general is less than the magnitude of the velocity) is the wrong statement. Speed is always greater than or equal to the magnitude of the velocity.
28 Medium
28 of 106
Application +4 | -1
A body has speed of V,2V and 3V in first 1/3 of distance S, seconds 1/3 of S and third 1/3 of S respectively. Its average speed will be
View answer and explanation
Correct option: C
1811v\frac{{18}}{{11}}v
Option C (1811v\frac{{18}}{{11}}v) is correct because it is calculated using the formula for average speed: total distance divided by total time.
29 Medium
29 of 106
Remembering +4 | -1
Parallactic second is the unit of:
View answer and explanation
Correct option: A
distance
Option A (distance) is correct because a parsec (parallactic second) is a unit specifically designed to measure astronomical distances.
30 Medium
30 of 106
Understanding +4 | -1
If a particle moves with an acceleration, then which of the following can remain constant
View answer and explanation
Correct option: D
only the speed
Option D (only the speed) is correct because acceleration can change the direction of velocity while keeping the speed constant (e.g., uniform circular motion).
Revision notes and key takeaways

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Key Takeaways

  • ✓ This set contains 106 single-correct-answer MCQs on MOTION IN A STRAIGHT LINE.
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