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Q1. Consider the following statements about a simple pendulum at a given place: I. The time period depends on its length. II. The time period depends on the mass of the bob. III. All pendulums of the same length have the same time period. Which of the statements are correct?
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Q2. Assertion (A): Galileo concluded that the time taken to complete one oscillation is the same for a pendulum of a given length. Reason (R): While sitting in a church, Galileo used his pulse to measure the time of swing of a hanging lamp and found each swing took the same time.
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Q3. Runner Ravi covers 400 m in 50 s; runner Suresh covers the same 400 m in 45 s. Who has the greater speed, and by how much (in m/s)?
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Q4. A galloping horse reaches a speed of 18 m/s. How does this compare with a train moving at 72 km/h?
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Q5. Consider an object moving along a straight line. Statements: I. Uniform linear motion means equal distances in equal time intervals. II. Non-uniform linear motion means unequal distances in equal time intervals. III. Uniform linear motion is commonly observed in everyday life over long distances. Which are correct?
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Q6. Train Y in Table 8.3 covers, in successive 10-minute intervals, distances of 20, 15, 15, 25, 20, and 25 km. The total distance covered between 10:00 AM and 11:00 AM is 120 km. The average speed of Train Y over this hour is
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Q7. A car covers 60 km in the first hour, 70 km in the second hour, and 50 km in the third hour. Its motion is _____ and its average speed is _____ km/h.
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Q8. A train moves at a constant speed of 25 m/s and covers 360 km. Time taken (in hours) is
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Q9. A train travels 180 km in 3 h. If it maintains the same speed, how far will it travel in 4 h?
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Q10. About the Samrat Yantra at Jantar Mantar, Jaipur, the chapter mentions: I. It is the world's largest stone sundial, about 27 m high. II. Its shadow moves about 1 mm per second on the scale. III. It measures Indian Standard Time directly without any correction. Which are correct?
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Q11. Assertion (A): All clocks, old or modern, are based on some process that repeats continuously. Reason (R): Periodically repeating processes can be used to mark equal intervals of time.
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Q12. Statements about the motion of a simple pendulum: I. It is oscillatory in nature. II. It is periodic, because it repeats its path after a fixed interval of time. III. It is circular, because the bob moves along an arc. Which are correct?
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Q13. A train travels 180 km in 3 h. Its speed in m/s is
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Q14. About the two types of water clock described in the chapter, consider: I. In one type, water flows out from a vessel that has time markings. II. In the other (sinking bowl) type, a bowl with a fine hole floats on water and gradually sinks. III. Both depend on the cycle of rising and setting of the Sun. Which are correct?
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Q15. A vehicle covers 2 km along a straight line. The first 500 m at 10 m/s, the next 500 m at 5 m/s. With what speed must it cover the remaining 1000 m so that the whole journey is completed in 200 s?
