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JEE Main Units, Measurements and Motion in a Straight Line — practice questions

Explore 45 free Units, Measurements and Motion in a Straight Line questions in JEE Main Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Units, Measurements and Motion in a Straight Line questions and exercises with answers

Showing questions 1–30 of 45.

The SI unit of acceleration is:Read the answer and worked solution →For an object moving with uniform velocity, the velocity-time graph is:Read the answer and worked solution →A car starting from rest accelerates uniformly at $2$ m/s². The distance covered in $5$ seconds is:Read the answer and worked solution →As per your syllabus, an object's position is x = a + bt² with a = 8.5 m, b = 2.5 m/s². What is its velocity at t = 0 s?Read the answer and worked solution →As per your syllabus, what is the velocity at t = 2.0 s?Read the answer and worked solution →As per your syllabus, what is the AVERAGE velocity of the same object between t = 2.0 s and t = 4.0 s?Read the answer and worked solution →As per your syllabus, what is RECTILINEAR motion?Read the answer and worked solution →As per your syllabus, what is INSTANTANEOUS SPEED equal to (in MAGNITUDE) — at a given instant?Read the answer and worked solution →As per your syllabus, what is INSTANTANEOUS acceleration?Read the answer and worked solution →As per your syllabus, what is the SI UNIT of acceleration?Read the answer and worked solution →As per your syllabus, what is the shape of an x-t graph for motion with UNIFORM (constant) acceleration?Read the answer and worked solution →As per your syllabus, the FIRST kinematic equation for uniformly accelerated motion (relating final + initial velocity and time) is which?Read the answer and worked solution →As per your syllabus, the SECOND kinematic equation (relating displacement, initial velocity, time, and acceleration) is which?Read the answer and worked solution →As per your syllabus, the THIRD kinematic equation (relating final velocity, initial velocity, acceleration, and displacement — without time) is which?Read the answer and worked solution →As per your syllabus, doubling the INITIAL VELOCITY of a vehicle increases its stopping distance by what factor?Read the answer and worked solution →As per your syllabus, a ball thrown upward at 20 m/s from a height of 25 m (g=10 m/s², neglecting air resistance) takes how long to hit the ground?Read the answer and worked solution →As per your syllabus, if an object starts from rest (v₀ = 0) and moves with constant acceleration a, what is its displacement after time t?Read the answer and worked solution →As per your syllabus, an object starting from rest with acceleration 2 m/s² travels what distance in 10 s?Read the answer and worked solution →As per your syllabus, a car at 126 km/h (= 35 m/s) brakes to stop in 200 m. What is its retardation (assumed uniform)?Read the answer and worked solution →As per your syllabus, how long does the same car (initial 35 m/s, retardation 3.06 m/s²) take to stop?Read the answer and worked solution →As per your syllabus, in a kinematic problem, the THREE equations of motion are valid under what condition?Read the answer and worked solution →As per your syllabus, the magnitude of ACCELERATION DUE TO GRAVITY (g) near the Earth's surface is approximately what value?Read the answer and worked solution →As per your syllabus, if a ball is dropped from REST and falls for 1 s, how far has it fallen (taking g = 10 m/s²)?Read the answer and worked solution →As per your syllabus, if a ball is dropped from REST and falls for 2 s (g = 10 m/s²), what is its velocity at t = 2s?Read the answer and worked solution →As per your syllabus, if a ball is dropped from rest and falls for 2 s (g = 10 m/s²), how far has it fallen?Read the answer and worked solution →As per your syllabus, if the ruler dropped d = 21 cm before being caught, what is the reaction time (g = 9.8 m/s²)?Read the answer and worked solution →Order the steps to derive v² = u² + 2asRead the answer and worked solution →Speed or velocityRead the answer and worked solution →What does the graph doRead the answer and worked solution →What does the graph tell youRead the answer and worked solution →

Worked practice questions

The SI unit of acceleration is:

  1. m/s
  2. m/s²
  3. m·s²
  4. kg·m/s
Show answer and solution

Correct answer: B. m/s²

Acceleration is the rate of change of velocity with time, so its dimension is [length]/[time]². SI unit: m/s². m/s is velocity. kg·m/s is momentum. m·s² makes no physical sense.

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For an object moving with uniform velocity, the velocity-time graph is:

  1. A straight line parallel to the time axis
  2. A straight line passing through the origin with positive slope
  3. A parabola
  4. A straight line passing through the origin with negative slope
Show answer and solution

Correct answer: A. A straight line parallel to the time axis

Uniform velocity means velocity is constant. On a $v$-$t$ graph, constant $v$ corresponds to a horizontal line at height $v$, parallel to the time axis. Option B (line through origin with positive slope) describes uniform *acceleration* from rest. Option C (parabola) would be a position-time graph for uniform acceleration, not velocity-time.

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A car starting from rest accelerates uniformly at $2$ m/s². The distance covered in $5$ seconds is:

  1. $10$ m
  2. $20$ m
  3. $25$ m
  4. $50$ m
Show answer and solution

Correct answer: C. $25$ m

Using $s = u t + \dfrac{1}{2} a t^2$ with $u = 0$, $a = 2$ m/s², $t = 5$ s: $s = 0 + \dfrac{1}{2} \times 2 \times 25 = 25$ m. Alternative: final velocity $v = at = 10$ m/s. Average velocity (from rest at constant acceleration) is $\bar v = \dfrac{0 + 10}{2} = 5$ m/s. Distance $= \bar v \cdot t = 5 \times 5 = 25$ m ✓. Option B (20 m) is the trap if you compute $v \times t = 10 \times 5 / 2.5$ or otherwise mishandle the factor of $\dfrac{1}{2}$.

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