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General Science Quiz: Friction and Circular Motion

  • 11 questions
  • 11 minutes
  • Difficulty: Medium
Useful for:SSCSSC CGLSSC CHSLSSC MTSRailwayRRB NTPCRRB Group DRRB ALPState ExamsNDA
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About this quiz

This General Science quiz on Friction and Circular Motion puts 11 multiple-choice questions to you, the verified MCQs published with GK24's note on the topic, 3 of them asked in real previous-year papers. Every question carries a full explanation of why the correct option is right and why the other options are wrong, so you learn the fact behind the answer rather than the letter. Attempt it right after reading the note, keep to the timer, and use the explanations at the end to mark what needs another look. Sit it again before the exam as a quick revision of the topic.

Questions in this quiz

11 questions with answers and explanations

Q2.General ScienceMedium

Which of the following statements about the coefficient of friction is correct?

  1. A.It is measured in newton
  2. B.It has no unit and no dimensions
  3. C.It is measured in newton per square metre
  4. D.It is measured in joule
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Correct answer: B. It has no unit and no dimensions

The coefficient of friction is the ratio of the limiting or kinetic frictional force to the normal reaction, and since both are forces the ratio is a pure number; the same reasoning applies to other ratios such as the refractive index and relative density.

Q3.General ScienceEasy

For the same pair of surfaces, which of the following types of friction is the smallest?

  1. A.Static friction
  2. B.Limiting friction
  3. C.Sliding friction
  4. D.Rolling friction
Show answer
Correct answer: D. Rolling friction

When a body rolls, the surfaces in contact change continuously and the irregularities have no time to interlock deeply, so rolling friction is very much smaller than sliding friction; this single fact is the reason the wheel was invented and the reason a ball bearing is fitted wherever a shaft…

Q6.General ScienceAsked in: Delhi · 7 Sept 2021, Shift 3Medium

A car travels in a circular motion. Which of the following statements is true?

  1. A.Distance travelled by the car will always be less than displacement of the car.
  2. B.Distance travelled by the car will always be more than displacement of the car.
  3. C.Distance travelled by the car will always be equal to displacement of the car.
  4. D.Distance travelled by the car will be zero when displacement is zero.
Show answer
Correct answer: B. Distance travelled by the car will always be more than displacement of the car.

Distance is the length of the actual path and displacement is the straight line from the start to the finish, so on a curved path the two can never be equal: the arc of a circle is always longer than the chord joining its ends.

Q8.General ScienceHard

On a frictionless banked road, the angle of banking for a curve of radius r and a speed v is given by the tangent of the angle equal to:

  1. A.v squared divided by r g
  2. B.r g divided by v squared
  3. C.v divided by r g
  4. D.v squared multiplied by r g
Show answer
Correct answer: A. v squared divided by r g

On a banked road the normal reaction is tilted, its vertical component balances the weight and its horizontal component supplies the centripetal force; dividing one equation by the other leaves the tangent of the banking angle equal to the square of the speed divided by the radius multiplied by the…

Q9.General ScienceEasy

Ball bearings are used in machines mainly because they:

  1. A.Convert rolling friction into sliding friction
  2. B.Convert sliding friction into rolling friction
  3. C.Remove friction altogether
  4. D.Increase the normal reaction on the shaft
Show answer
Correct answer: B. Convert sliding friction into rolling friction

A shaft turning directly inside a sleeve slides against it, and sliding friction is large; placing hard steel balls between the shaft and its housing makes the surfaces roll over one another instead, and rolling friction is a small fraction of sliding friction, so less energy is wasted and the…

Q10.General ScienceMedium

A cyclist leans inward while taking a turn because:

  1. A.It reduces the weight of the cycle
  2. B.The reaction of the ground then has a horizontal component towards the centre of the turn
  3. C.It increases the rolling friction of the tyres
  4. D.It makes the centrifugal force disappear
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Correct answer: B. The reaction of the ground then has a horizontal component towards the centre of the turn

To move along a curve a body needs a force directed towards the centre of that curve.

Q11.General ScienceEasy

The centripetal acceleration of a body moving in a circle of radius r with uniform speed v is directed:

  1. A.Along the tangent, in the direction of motion
  2. B.Towards the centre of the circle
  3. C.Away from the centre of the circle
  4. D.Vertically downward
Show answer
Correct answer: B. Towards the centre of the circle

In uniform circular motion the magnitude of the velocity does not change, so the acceleration can have no component along the direction of motion; the whole of it is perpendicular to the velocity and points to the centre, which is why it is called centripetal, meaning centre seeking, and its…

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