Motion Quiz - ICSE Class 8 Science

Free practice quiz: Motion (ICSE Class 8 Science). 61 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. A car travels from point A to point B at a speed of 40 km/h and returns from point B to point A at a speed of 60 km/h. What is the average speed of the car for the entire journey?

   1. 48 km/h
   2. 50 km/h
   3. 52 km/h
   4. 60 km/h
   Show answer

   Answer: A. 48 km/h

   Let the distance between A and B be 'd' km. Time taken from A to B = d/40 hours. Time taken from B to A = d/60 hours. Total distance = 2d km. Total time = d/40 + d/60 = (3d + 2d)/120 = 5d/120 = d/24 hours. Average speed = Total distance / Total time = 2d / (d/24) = 2d * (24/d) = 48 km/h.

2. Which of the following graphs correctly represents uniform deceleration?

   1. A straight line with positive slope.
   2. A straight line with negative slope.
   3. A horizontal straight line.
   4. A curved line starting from a point on the velocity axis.
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   Answer: B. A straight line with negative slope.

   Deceleration is negative acceleration, meaning the velocity is decreasing. In a velocity-time graph, a decreasing velocity is represented by a downward sloping line. Uniform deceleration means the rate of decrease is constant, hence a straight line with a negative slope.

3. Which statement best describes a scalar quantity?

   1. It has both magnitude and direction.
   2. It has magnitude only.
   3. It has direction only.
   4. It is always positive.
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   Answer: B. It has magnitude only.

   A scalar quantity is a physical quantity that can be described by a single magnitude (or numerical value) and has no direction. Examples include mass, speed, distance, temperature, and time.

4. A vehicle is moving at a constant speed of 20 m/s. How far will it travel in 30 seconds?

   1. 500 meters
   2. 600 meters
   3. 650 meters
   4. 700 meters
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   Answer: B. 600 meters

   Distance = Speed × Time. Given Speed = 20 m/s and Time = 30 s. Distance = 20 m/s × 30 s = 600 meters.

5. When an object is at rest, its velocity is:

   1. Constant and non-zero.
   2. Zero.
   3. Changing.
   4. Infinite.
   Show answer

   Answer: B. Zero.

   An object at rest means it is not moving. If it is not moving, its velocity (which includes speed and direction) is zero.

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