Motion Quiz - ICSE Class 7 Science
Free practice quiz: Motion (ICSE Class 7 Science). 44 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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A car travels from point A to point B at a constant speed of 60 km/h and returns from point B to point A at a constant speed of 40 km/h. What is the average speed of the car for the entire journey?
- 50 km/h
- 48 km/h
- 52 km/h
- 45 km/h
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Answer: B. 48 km/h
Let the distance between A and B be 'd' km. Time taken to travel from A to B = d/60 hours. Time taken to travel from B to A = d/40 hours. Total distance = 2d km. Total time = (d/60) + (d/40) = (2d + 3d)/120 = 5d/120 = d/24 hours. Average speed = Total distance / Total time = 2d / (d/24) = 2d * (24/d) = 48 km/h.
Which of the following terms describes a change in the position of an object?
- Speed
- Velocity
- Displacement
- Time
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Answer: C. Displacement
Displacement is a vector quantity that represents the change in an object's position from its initial point to its final point. Speed is the rate of change of distance, velocity is the rate of change of displacement, and time is a measure of duration.
A particle moves along a circular path of radius 7 meters. If it completes half a revolution, what is the distance traveled and the magnitude of displacement?
- Distance = 22 m, Displacement = 7 m
- Distance = 22 m, Displacement = 14 m
- Distance = 14 m, Displacement = 7 m
- Distance = 14 m, Displacement = 0 m
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Answer: B. Distance = 22 m, Displacement = 14 m
Distance traveled in half a revolution is half the circumference of the circle: (1/2) * 2πr = πr = (22/7) * 7 m = 22 m. The displacement is the straight-line distance between the start and end points. For half a revolution on a circle, this is the diameter, which is 2r = 2 * 7 m = 14 m.
A cyclist travels around a circular path at a constant speed. What is true about the cyclist's motion?
- Velocity is constant.
- Acceleration is zero.
- Speed is changing.
- Velocity is changing.
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Answer: D. Velocity is changing.
Although the speed is constant in uniform circular motion, the direction of motion is continuously changing. Since velocity is a vector quantity (magnitude and direction), a change in direction means a change in velocity. A changing velocity implies acceleration.
Which of the following is NOT an example of circular motion?
- The Earth revolving around the Sun
- A car moving on a straight road
- The moon revolving around the Earth
- The hands of a clock moving
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Answer: B. A car moving on a straight road
Circular motion involves an object moving along a circular path. The Earth around the Sun, the moon around the Earth, and clock hands all exhibit circular or near-circular motion. A car on a straight road exhibits linear motion.