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Assertion & Reason Test: Motion in a Straight Line - NEET MCQ


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15 Questions MCQ Test Topic-wise MCQ Tests for NEET - Assertion & Reason Test: Motion in a Straight Line

Assertion & Reason Test: Motion in a Straight Line for NEET 2024 is part of Topic-wise MCQ Tests for NEET preparation. The Assertion & Reason Test: Motion in a Straight Line questions and answers have been prepared according to the NEET exam syllabus.The Assertion & Reason Test: Motion in a Straight Line MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Assertion & Reason Test: Motion in a Straight Line below.
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Assertion & Reason Test: Motion in a Straight Line - Question 1

Directions : Each of these questions contain two statements, Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.

Assertion : A body may be accelerated even when it is moving uniformly.

Reason : When the direction of motion of the body is changing, the body must have acceleration.

Detailed Solution for Assertion & Reason Test: Motion in a Straight Line - Question 1
  • The assertion states that a body can be accelerated while moving uniformly. This is true in the context of circular motion, where speed remains constant but direction changes.
  • The reason explains that changing direction indicates acceleration. This is also true because acceleration is defined as a change in velocity, which includes changes in direction.
  • Since both statements are correct and the reason explains the assertion, the answer is option 1.
Assertion & Reason Test: Motion in a Straight Line - Question 2

Directions : Each of these questions contain two statements, Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.

Assertion : For one dimensional motion the angle between acceleration and velocity must be zero.

Reason : One dimensional motion is always on a straight line.

Detailed Solution for Assertion & Reason Test: Motion in a Straight Line - Question 2
One dimensional motion is always along straight line. But acceleration may be opposite of velocity and so angle between them will be 180°.
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Assertion & Reason Test: Motion in a Straight Line - Question 3

Directions : Each of these questions contain two statements, Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.

Assertion : The position-time graph of a uniform motion, in one dimension of a body cannot have negative slope.

Reason : In one – dimensional motion the position does not reverse, so it cannot have a negative slope.

Detailed Solution for Assertion & Reason Test: Motion in a Straight Line - Question 3

Explanation:


  • The assertion that the position-time graph of a uniform motion in one dimension cannot have a negative slope is correct. This is because in uniform motion, the object moves at a constant speed in a straight line, so the position of the object does not reverse.

  • However, the reason provided that in one-dimensional motion the position does not reverse, so it cannot have a negative slope, is incorrect. While it is true that the position does not reverse in one-dimensional motion, it does not necessarily mean that the slope of the position-time graph cannot be negative.

  • Therefore, the correct answer is option C: Assertion is correct, reason is incorrect.

  •  
Assertion & Reason Test: Motion in a Straight Line - Question 4

Directions : Each of these questions contain two statements, Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.

Assertion : Velocity-time graph for an object in uniform motion along a straight path is a straight line parallel to the time axis.

Reason : In uniform motion of an object velocity increases as the square of time elapsed.

Detailed Solution for Assertion & Reason Test: Motion in a Straight Line - Question 4
In uniform motion the object moves with uniform velocity, the magnitude of its velocity at different instance i.e., at t = 0, t =1, sec, t = 2sec ….. will always be constant. Thus velocity-time graph for an object in uniform motion along a straight path is a straight line parallel to time axis.
Assertion & Reason Test: Motion in a Straight Line - Question 5

Directions : Each of these questions contain two statements, Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.

Assertion: The average velocity of the object over an interval of time is either smaller than or equal to the average speed of the object over the same interval.

Reason: Velocity is a vector quantity and speed is a scalar quantity.

Detailed Solution for Assertion & Reason Test: Motion in a Straight Line - Question 5
Because displacement ≤ distance and so average velocity ≤ average speed.
Assertion & Reason Test: Motion in a Straight Line - Question 6

Directions : Each of these questions contain two statements, Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.

Assertion : An object can have constant speed but variable velocity.

Reason : Speed is a scalar but velocity is a vector quantity.

Detailed Solution for Assertion & Reason Test: Motion in a Straight Line - Question 6
Since velocity is a vector quantity, hence as its direction changes keeping magnitude constant, velocity is said to be changed. But for constant speed in equal time interval distance travelled should be equal.
Assertion & Reason Test: Motion in a Straight Line - Question 7

Directions : Each of these questions contain two statements, Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.

Assertion : A particle starting from rest and moving with uniform acceleration travels’ a length of x and 3x in first two and next two-seconds.

Reason : Displacement is directly proportional to velocity.

Detailed Solution for Assertion & Reason Test: Motion in a Straight Line - Question 7
Assertion is correct, reason is incorrect
Assertion & Reason Test: Motion in a Straight Line - Question 8

Directions : Each of these questions contain two statements, Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.

Assertion : The position-time graph of a uniform motion in one dimension of a body can have negative slope.

Reason : When the speed of body decreases with time, the position-time graph of the moving body has negative slope.

Detailed Solution for Assertion & Reason Test: Motion in a Straight Line - Question 8
Negative slope of position time graph represents that the body is moving towards the negative direction and if the slope of the graph decrease with time then it represents the decrease in speed i.e. retardation in motion.
Assertion & Reason Test: Motion in a Straight Line - Question 9

Directions : Each of these questions contain two statements, Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.

Assertion : Displacement of a body may be zero when distance travelled by it is not zero.

Reason : The displacement is the longest distance between initial and final position.

Detailed Solution for Assertion & Reason Test: Motion in a Straight Line - Question 9
The displacement is the shortest distance between initial and final position. When final position of a body coincides with its initial position, displacement is zero, but the distance travelled is not zero.
Assertion & Reason Test: Motion in a Straight Line - Question 10

Directions : Each of these questions contain two statements, Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.

Assertion : Displacement of a body is vector sum of the area under velocity– time graph.

Reason : Displacement is a vector quantity.

Detailed Solution for Assertion & Reason Test: Motion in a Straight Line - Question 10
According to definition, displacement = velocity × time. Since displacement is a vector quantity so its value is equal to the vector sum of the area under velocity-time graph.
Assertion & Reason Test: Motion in a Straight Line - Question 11

Directions : Each of these questions contain two statements, Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.

Assertion : Position-time graph of a stationary object is a straight line parallel to time axis.

Reason : For a stationary object, position does not change with time.

Detailed Solution for Assertion & Reason Test: Motion in a Straight Line - Question 11
Position-time graph for a stationary object is a straight line parallel to time axis showing that not change in position with time.
Assertion & Reason Test: Motion in a Straight Line - Question 12

Directions : Each of these questions contain two statements, Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.

Assertion : The average and instantaneous velocities have same value in a uniform motion.

Reason : In uniform motion, the velocity of an object increases uniformly.

Detailed Solution for Assertion & Reason Test: Motion in a Straight Line - Question 12
In uniform motion the speed is same at each instant of motion.
Assertion & Reason Test: Motion in a Straight Line - Question 13

Directions : Each of these questions contain two statements, Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.

Assertion : The speedometer of an automobile measure the average speed of the automobile.

Reason : Average velocity is equal to total displacement per total time taken.

Detailed Solution for Assertion & Reason Test: Motion in a Straight Line - Question 13
Speedometer measures instantaneous speed of automobile.
Assertion & Reason Test: Motion in a Straight Line - Question 14

Directions : Each of these questions contain two statements, Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.

Assertion : position-time graph of a body moving uniformly in a straight line parallel to position axis. Says body is at rest.

Reason : The slope of position-time graph in a uniform motion gives the velocity of an object.

Detailed Solution for Assertion & Reason Test: Motion in a Straight Line - Question 14

If the position-time graph of a body is a straight line parallel to the position axis, it means that the position of the body is not changing with time. So the body is at rest. But it is said that the body moving uniformly. Therefore the assertion is incorrect. But it is true that the slope of the position-time graph gives the velocity.

Assertion & Reason Test: Motion in a Straight Line - Question 15

Directions : Each of these questions contain two statements, Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.

Assertion : A body cannot have acceleration if its velocity is zero at a given instant of time. 

Reason : A body is momentarily at rest when it reverses the direction.

Detailed Solution for Assertion & Reason Test: Motion in a Straight Line - Question 15

Velocity of a body and acceleration are in opposite direction, then surely acceleration acting in the opposite direction will slow down the velocity of the body. Ultimately, the body will momentarily come to rest before reversing its direction but at this instant of time only velocity will be zero and acceleration will still be acting on the body. Hence, the reason is the correct explanation of the assertion.

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