Motion And Time Worksheet

            Objective Type Questions

1. Fill in the blanks:
   The time measured by …… clocks are more accurate than those measured by clocks available earlier. 
   
   
2. Match the following:
   
   
   
3. Analogy:
   Speedometer: ________ :: Odometer: kilometre
   
   
4. State whether the statement is true or false:
   The graph given below shows that the car is moving with a constant speed.
   
   
   Multiple Choice Questions
   
   
5. Image (A) and (B) represents the clocks which were available in ancient times. What are (A) and (B) respectively?
   
   (a) Sundial, water clock
   (b) Sand clock, water clock
   (c) Sand clock, sundial
   (d) Water clock, sundial 
   
   
6. A bike moves with a speed of 60 km/h and covers 45 km distance then the total time taken by bike is
   (a) 0.50 h
   (b) 0.75 h
   (c) 0.80 h
   (d) 1 h
   
   
7. A simple pendulum takes 60 s to complete 30 oscillations. The time period of the pendulum is
   (a) 0.5 s
   (b) 1
   (c) 1.5 s
   (d) 2 s
   
   
8. How many seconds make 1 hour?
   (a) 600 s
   (b) 3200 s
   (c) 3600 s
   (d) 7200 s
   
   
9. Which of the following is correct way to write distance travelled by an object? 
   (a) 50 kms
   (b) 60 cms
   (c) 50 km
   (d) 60 c
   
   Subjective Questions
   
   
10. Draw a distance – time graph showing bike is parked on a roadside.
    
    
11. Is it necessary to consider average speed while calculating distance covered or time taken? Give reason for your answer. 
    
    
12. A car moves with a speed of 60 km/h and covers a distance 15 km and then with a speed of 40 km/h and cover the distance 20 km to reach the destination. What is the total time taken by the car to complete the journey?
    
    
13. Arrange the following distances in their increasing magnitude:
    1 kilometre, 5 centimetres, 10 metres, 100 millimetres
    
    
    
14. From the two given cases which one is moving faster and slower? Justify your answer.
    Case A: A bike going over 44 kilometres in 2 hours.
    Case B: A car covering a distance of 150 km in 3 hours.
    
    
15. A motorbike travels a distance ‘s’ with constant speed v1 and travels distance s with constant speed v2. Calculate the average speed of the motorbike.
16. On which factor does the time period of simple pendulum depends?
    
    
17. A body is moving along a path. Its distance – time graph is shown below:
    
    What will be the time taken by the body to cover distance of 80 km?
    
    Assertion-Reasoning Questions
    
    Below questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
    
    
    
    
18. Assertion: Motion of the Earth around the Sun is an example of an oscillatory motion.
    Reason: All oscillatory motions are periodic motion.
    
    
19. Assertion: A nanosecond is one billionth of a second.
    Reason: The ages of stars are expressed in terms of centuries.
    
    Case-Based Questions
    
    
20. Mayur travels from Surat to Bandra. Below is the time table for the express train which he boards. Throughout the journey, the average speed of train is approximately 54 km/h. Based on the given information answer the following questions:
    
    (a) What is the total time taken (in seconds) by Mayur to complete his journey?
    (b) Calculate the total time taken by train to travel from Surat to Thane station.
    (c) Convert the average speed from km/h to m/s.
    Calculate the total distance between Surat and Bandra in kilometres.  

            Objective Type Questions

1. Fill in the blanks:
   The time measured by …… clocks are more accurate than those measured by clocks available earlier. 
   Solution: The time measured by quartz clocks are more accurate than those measured by clocks available earlier. 
   
   
2. Match the following:
   
   Solution:
   
   
   
3. Analogy:
   Speedometer: ________ :: Odometer: kilometre
   Solution: Speedometer: kilometre per hour (km/h):: Odometer: kilometre
   
   
4. State whether the statement is true or false:
   The graph given below shows that the car is moving with a constant speed.
   
   Solution: False
   The graph given shows that the car is moving with non – constant speed.
   
   Multiple Choice Questions
   
   
5. Image (A) and (B) represents the clocks which were available in ancient times. What are (A) and (B) respectively?
   
   (a) Sundial, water clock
   (b) Sand clock, water clock
   (c) Sand clock, sundial
   (d) Water clock, sundial
   Correct option: (b) Sand clock, water clock
   Solution: Image (A) and (B) are sand clock and water clock respectively. 
    
6. A bike moves with a speed of 60 km/h and covers 45 km distance then the total time taken by bike is
   (a) 0.50 h
   (b) 0.75 h
   (c) 0.80 h
   (d) 1 h
   Correct option: (b) 0.75 h
   Solution: The total time taken will be = total distance/speed
   Thus, time = 45/60 = 0.75 h 
   
   
7. A simple pendulum takes 60 s to complete 30 oscillations. The time period of the pendulum is
   (a) 0.5 s
   (b) 1
   (c) 1.5 s
   (d) 2 s
   Correct option: (d) 2 s
   Solution: The time period of simple pendulum will be 2 s
   Total oscillation = 30
   Total time taken = 60 s
   Time period = total time taken/ oscillations = 60/30 = 2 s
   
   
8. How many seconds make 1 hour?
   (a) 600 s
   (b) 3200 s
   (c) 3600 s
   (d) 7200 s
   Correct option: (c) 3600 s
   Solution: 1 hour = 60 min x 60 s = 3600 s
   
   
9. Which of the following is correct way to write distance travelled by an object?
   (a) 50 kms
   (b) 60 cms
   (c) 50 km
   (d) 60 c
   Correct option: (c) 50 km
   Solution: The symbols of all units are written in singular. Thus, 50 km is the correct way to write the distance travelled by an object.
   
   Subjective Questions
   
   
10. Draw a distance – time graph showing bike is parked on a roadside.
    Solution: Distance – time graph for the bike parked on roadside:
    
    
    
11. Is it necessary to consider average speed while calculating distance covered or time taken? Give reason for your answer. 
    Solution: Yes, it is necessary to consider average speed because during the journey object may undergo change in speed. To include these changes and to simplify calculations we assume speed to be average of the fluctuations taken place.
    
    
12. A car moves with a speed of 60 km/h and covers a distance 15 km and then with a speed of 40 km/h and cover the distance 20 km to reach the destination. What is the total time taken by the car to complete the journey?
    Solution: We know that
    Speed = Distance/ Time
    Thus,
    Time = Distance/ Speed
    V1 = 60 km/h
    D1 = 30 km
    V2 = 40 km/h
    D2 = 15 km/h
    Time=  
    Time=  
    Time =0.875 h=0.875 × 60=52.5 min
    
    
13. Arrange the following distances in their increasing magnitude:
    1 kilometre, 5 centimetres, 10 metres, 100 millimetres
    Solution:100 millimetres = 10 centimetres
    Thus, 10 centimetres is greater than 100 millimetres.
    Increasing order: 5 centimetres, 100 millimetres, 10 metres, 1 kilometre 
    
    
14. From the two given cases which one is moving faster and slower? Justify your answer.
    Case A: A bike going over 44 kilometres in 2 hours.
    Case B: A car covering a distance of 150 km in 3 hours.
    Solution: Case A: Distance covered = 44 km 
                  and time taken = 2 h
                   Speed of bike = distance covered/time taken = 44/2 = 22 km/h
    Case B: Distance covered = 150 km
                    and time taken = 3 h
                   Speed of car = distance covered/time taken = 150/3 = 50 km/h
    Thus, speed of the car is greater than speed of the bike. Hence, the car is moving faster than the bike.
    
    
15. A motorbike travels a distance ‘s’ with constant speed v1 and travels distance s with constant speed v2. Calculate the average speed of the motorbike.
    Solution: Total distance travelled = s + s = 2s
    t₁ = s/v₁ and t₂ = s/v₂
    Average speed = Total distance travelled/ total time taken 
    
    
    
16. On which factor does the time period of simple pendulum depends?
    Solution: Time period of simple pendulum depends on the length of pendulum.
    
    
17. A body is moving along a path. Its distance – time graph is shown below:
    
    What will be the time taken by the body to cover distance of 80 km?
    Solution: Speed = Distance/Time = 40/60 = 2/3 km/min
    The time required to travel 80 km will be
    = distance/speed =  = 120 minutes = 120/60 = 2 hours
    
    Assertion-Reasoning Questions
    
    Below questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
    
    
    
18. Assertion: Motion of the Earth around the Sun is an example of an oscillatory motion.
    Reason: All oscillatory motions are periodic motion.
    Correct option: (d) A is false, but R is true.
    Motion of the Earth around the Sun is an example of periodic motion but not an example of oscillatory motion. Even though all oscillatory motions are periodic not all periodic motions are oscillatory.
    
    
19. Assertion: A nanosecond is one billionth of a second.
    Reason: The ages of stars are expressed in terms of centuries.
    Correct option: (c) A is true, but R is false.
    Solution: The ages of stars is expressed in terms of billions of years.
    
    Case-Based Questions
    
    
20. Mayur travels from Surat to Bandra. Below is the time table for the express train which he boards. Throughout the journey, the average speed of train is approximately 54 km/h. Based on the given information answer the following questions:
    
    (a) What is the total time taken (in seconds) by Mayur to complete his journey?
    (b) Calculate the total time taken by train to travel from Surat to Thane station.
    (c) Convert the average speed from km/h to m/s.
    Calculate the total distance between Surat and Bandra in kilometres. 
    Solution: 
    (a) Total time taken is 4 hours and 30 minutes.
    Let’s now convert this time in seconds.
    Thus, total time taken = (4 h × 60 min + 30 min) × 60 s = 16,200 s
    Thus, total time taken by Mayur to complete his entire journey is 16200 seconds.
    (b) Total time taken by the train to complete the journey from Surat to Thane is
    3 hours = 3 × 60 × 60 = 10,800 s
    (c) To convert speed from km/h to m/s multiply the number by 5/18
    Thus, average speed in km/h = 54×5/18=15 m/s
    (d) We know that, 
    
    Average speed=   (Total distance covered )/(Total time taken)
    Total distance between Surat and Bandra is given by,
    Total distance covered=  Average speed ×Total time taken
    Total distance covered = 15 × 16,200 s = 2,43,000 m = 243 km
    Thus, total distance between Surat and Bandra is 243 km.