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Karnataka PUC I Units, Measurements and Motion in a Straight Line — practice questions — page 2

Explore 50 free Units, Measurements and Motion in a Straight Line questions in Karnataka PUC I 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 31–50 of 50.

Which group contains only scalar quantities?Read the answer and worked solution →A weather report gives a temperature of -20 degrees Celsius. What does the minus sign indicate?Read the answer and worked solution →In one-dimensional motion, how is the direction of a vector usually indicated?Read the answer and worked solution →What is the SI unit of time?Read the answer and worked solution →A lesson begins at 11:00 in the morning and ends at 11:50 the same morning. What is the elapsed time?Read the answer and worked solution →What is the SI unit of velocity?Read the answer and worked solution →An aircraft passenger takes 5 s to move -4 m along the cabin. What is his average velocity?Read the answer and worked solution →What does a car's speedometer display?Read the answer and worked solution →Average acceleration is defined as which of the following?Read the answer and worked solution →What is the SI unit of acceleration?Read the answer and worked solution →Deceleration is best defined as which of the following?Read the answer and worked solution →A racehorse accelerates from rest to a velocity of 15.0 m/s in 1.80 s. What is the magnitude of its average acceleration?Read the answer and worked solution →A train accelerates from rest to 30.0 km/h in 20.0 s. What is its average acceleration in SI units?Read the answer and worked solution →A train slows to a stop from a speed of 30.0 km/h in 8.00 s. What is its average acceleration in SI units?Read the answer and worked solution →A train has a displacement of -1.50 km and takes 5.00 min to make the trip. What is its average velocity?Read the answer and worked solution →A train travelling at -20.0 km/h slows to a stop in 10.0 s. What is its average acceleration in SI units?Read the answer and worked solution →A driver steadily increases speed from 30 km/h to 60 km/h. What is the average velocity during this steady increase?Read the answer and worked solution →Scalar or vector?Read the answer and worked solution →Key in the motion answerRead the answer and worked solution →Which is larger?Read the answer and worked solution →

Worked practice questions

Which group contains only scalar quantities?

  1. Temperature, speed and distance
  2. Velocity, force and displacement
  3. Displacement, distance and force
  4. Speed, velocity and temperature
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Correct answer: A. Temperature, speed and distance

1. A scalar is any quantity that has a magnitude but no direction. 2. A 20 degree Celsius temperature, a 90 km/h speed limit and a distance of 2.0 m are all scalars. 3. Displacement and velocity are vectors, whereas distance and speed are scalars. 4. Force is a vector too, so any group containing force or velocity fails. _Source: OpenStax College Physics (CC BY 4.0), Ch 2 "Kinematics", section 2.2 Vectors, Scalars, and Coordinate Systems_

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A weather report gives a temperature of -20 degrees Celsius. What does the minus sign indicate?

  1. A direction opposite to the chosen axis
  2. A vector pointing towards colder places
  3. An error, since scalars cannot be negative
  4. A point on a scale rather than a direction
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Correct answer: D. A point on a scale rather than a direction

1. Temperature is a scalar, since it has a magnitude but no direction. 2. A scalar can still be negative, as a temperature of -20 degrees Celsius is. 3. Here the minus sign indicates a point on a scale rather than a direction. 4. Treating it as a direction would wrongly promote a scalar to a vector. _Source: OpenStax College Physics (CC BY 4.0), Ch 2 "Kinematics", section 2.2 Vectors, Scalars, and Coordinate Systems_

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In one-dimensional motion, how is the direction of a vector usually indicated?

  1. By writing the angle it makes with the axis
  2. By stating the magnitude in SI base units
  3. By giving the quantity a plus or a minus sign
  4. By marking the quantity with a bar above it
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Correct answer: C. By giving the quantity a plus or a minus sign

1. Motion in one dimension has only two possible directions along the line. 2. The direction of a vector is therefore given simply by a plus or a minus sign. 3. Angles are needed only once motion leaves a single straight line. 4. A bar above a symbol marks an average value, not a direction. _Source: OpenStax College Physics (CC BY 4.0), Ch 2 "Kinematics", section 2.2 Vectors, Scalars, and Coordinate Systems_

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More Physics topics

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