Measurement of Time and Motion — Quiz

Q1. A car travels 150 metres in 10 seconds. Its speed in km/h is

• A. 54 km/h
• B. 15 km/h
• C. 1.5 km/h
• D. 150 km/h

Q2. Swati's school is 3.6 km from her house. She reaches it on her bicycle in 15 min. Her speed in m/s is

• A. 0.24 m/s
• B. 14.4 m/s
• C. 240 m/s
• D. 4 m/s

Q3. Raghav is going to a neighbouring city in a bus moving at a constant speed of 50 km/h. If the journey takes 2 h, the city is how far?

• A. 25 km
• B. 52 km
• C. 100 km
• D. 200 km

Q4. A train travels at 90 km/h. How much time will it take to cover 360 km?

• A. 3 h
• B. 4 h
• C. 4.5 h
• D. 9 h

Q5. A train travels 180 km in 3 h. Its speed in km/h is

• A. 540 km/h
• B. 60 km/h
• C. 30 km/h
• D. 0.06 km/h

Q6. While writing time in symbols, the correct form is

• A. 30 sec.
• B. 30 secs
• C. 30 s
• D. 30 S

Q7. A pendulum bob starts from mean position O. Which path corresponds to one complete oscillation?

• A. O to A only
• B. O to A and back to O
• C. O to A, then to B, and back to O
• D. O to A to B without returning

Q8. In Activity 8.2, Priya measures that her pendulum takes 20 seconds to complete 10 oscillations. The time period of the pendulum is

• A. 0.5 s
• B. 10 s
• C. 200 s
• D. 2 s

Q9. Asha repeats Activity 8.2 keeping the pendulum length unchanged but replacing the bob with a heavier one. She will most likely observe that the time period

• A. Increases sharply
• B. Decreases sharply
• C. Becomes zero
• D. Remains almost the same

Q10. A car moving in heavy city traffic on a straight road keeps changing its speed — sometimes slow, sometimes fast, often stopping. Its motion is best described as

• A. Uniform linear motion
• B. Non-uniform linear motion
• C. Circular motion
• D. Oscillatory motion

Q11. In Table 8.3 of the chapter, Train X covers 20 km in each successive 10-minute interval between 10:00 AM and 11:00 AM. Train X is therefore in

• A. Non-uniform linear motion
• B. Uniform linear motion
• C. Circular motion
• D. Random motion

Q12. The sinking bowl-type water clock used in ancient India is also called

• A. Surya-yantra
• B. Ghatika-yantra
• C. Samrat-yantra
• D. Jala-darpan

Q13. Today's atomic clocks are so precise that they lose only about one second in

• A. 10 minutes
• B. one day
• C. one year
• D. millions of years

Q14. A train travels at different speeds during a journey. The 'speed' calculated by dividing total distance by total time is more correctly called its

• A. Maximum speed
• B. Minimum speed
• C. Instantaneous speed
• D. Average speed

Q15. Runner A finishes 100 m in 12 seconds and runner B finishes the same 100 m in 14 seconds. Who is faster?

• A. A, because A took less time for the same distance
• B. B, because 14 is more than 12
• C. Both are equally fast
• D. Cannot be decided without their masses