Class 7 Exam > Class 7 Notes > Science (Curiosity) Class 7 - New NCERT > Unit Test : Measurement of Time and Motion
Unit Test : Measurement of Time and Motion | Science (Curiosity) Class 7 - New NCERT PDF Download
Time: 1 Hour
Maximum Marks: 30
Instructions:
Attempt all questions.
Question numbers 1 to 5 carry 1 mark each .
Question numbers 6 to 8 carry 2 marks each.
Question numbers 9 to 11 carry 3 marks each.
Question numbers 12 and 13 carry 5 marks each.
Q1. Which device uses the Sun’s shadow to tell time? (1 Mark)
a) Water Clock
b) Sundial
c) Hourglass
d) Pendulum Clock
Q2. What is the SI unit of time? (1 Mark)
a) Minute
b) Hour
c) Second
d) Ghati
Q3. What is the time period of a pendulum? (1 Mark)
a) Time to swing once
b) Time to stop swinging
c) Time to set up the pendulum
d) Time to measure distance
Q4. Which instrument in a car shows how fast it is going? (1 Mark)
a) Odometer
b) Speedometer
c) Clock
d) Thermometer
Q5. What type of motion is a train moving at constant speed on a straight track? (1 Mark)
a) Non-uniform linear motion
b) Uniform linear motion
c) Circular motion
d) Random motion
Q6. What is an hourglass, and how does it measure time? (2 Mark)
Q7. What is a speedometer, and why is it useful for drivers? (2 Mark)
Q8. What is non-uniform linear motion? Give one example. (2 Mark)
Q9. What is the difference between an odometer and a speedometer? Give an example of how each is used. (3 Mark)
Q10. Calculate the speed of a car that travels 150 meters in 10 seconds. Express your answer in km/h. (3 Mark)
Q11. Differentiate between circular motion and periodic motion. (3 Mark)
Q12.A car moves with a speed of 40 km/h for 15 minutes and then with a speed of 60 km/h for the next 15 minutes. The total distance covered by the car? (5 Mark)
Q13. A simple pendulum takes 15 seconds to complete 5 oscillations. What is the time period of a pendulum? (5 Mark)
You can find the solutions of this Unit Test here: Unit Test Solutions: Measurement of Time and Motion
The document Unit Test : Measurement of Time and Motion | Science (Curiosity) Class 7 - New NCERT is a part of the Class 7 Course Science (Curiosity) Class 7 - New NCERT.
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FAQs on Unit Test : Measurement of Time and Motion - Science (Curiosity) Class 7 - New NCERT
| 1. What is the importance of measuring time in science and daily life? |  |
Ans. Measuring time is crucial in both science and daily life as it helps us understand the duration of events and the sequence in which they occur. In science, accurate time measurement allows for precise experiments and observations, enabling researchers to establish cause-and-effect relationships. In daily life, time management is essential for scheduling activities, meeting deadlines, and planning events, making it a fundamental aspect of organization and productivity.
| 2. How do we measure motion, and what are the common units used? | |
Ans. Motion is measured by observing the change in position of an object over time. The common units for measuring motion include meters (m) for distance and seconds (s) for time. Speed is often expressed in meters per second (m/s), which indicates how far an object travels in a specific duration. Other units like kilometers per hour (km/h) may also be used, especially for vehicles.
| 3. What are the different types of motion, and how can they be classified? | |
Ans. Motion can be classified into several types, including linear motion (movement in a straight line), rotational motion (movement around an axis), and periodic motion (motion that repeats at regular intervals, like a pendulum). Additionally, motion can be uniform (constant speed) or non-uniform (changing speed). Understanding these classifications helps in analyzing and predicting the behavior of moving objects.
| 4. How did the invention of clocks impact society historically? | |
Ans. The invention of clocks, particularly mechanical clocks in the Middle Ages, significantly impacted society by standardizing time. This advancement allowed for more accurate scheduling of daily activities, leading to improved coordination in trade, transportation, and communication. As a result, societies became more organized, and the concept of time management became essential in various aspects of life, influencing everything from work hours to cultural practices.
| 5. Why is it essential to understand the concept of speed in the context of motion? | |
Ans. Understanding speed is vital in the context of motion as it quantifies how quickly an object moves. Speed is the rate at which distance is covered over time, and knowing it helps in various applications, such as travel planning, sports, and safety measures. For instance, understanding speed limits in vehicles ensures safer road usage, while in sports, athletes can strategize performance based on their speed capabilities.
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