CBSE Class 7 Science Chapter 08 Measurement Of Time And Motion MCQs Set 02

Science Objective Questions and Answers: Chapter 08 Measurement Of Time And Motion

Review structured MCQ sets for Class 7 Science Chapter 08 Measurement Of Time And Motion. Built according to official CBSE guidelines, these downloadable questions support daily revision and core concept reinforcement.

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Access the complete set of multiple-choice questions for Chapter 08 Measurement Of Time And Motion below. This focused format allows students to isolate specific topics for thorough review and uninterrupted practice alongside official CBSE textbooks.

Question: Before mechanical clocks became widespread, ancient societies developed various timekeeping devices. Which of the following devices relied on the gradual downward movement of sand as its mechanism for tracking the passage of time?
A. Sundial
B. Water clock
C. Hourglass
D. Candle clock
Show Answer & Explanation

Answer: (C) Hourglass

Explanation:
The chapter explicitly describes an hourglass as a device where 'time was measured on the basis of the flow of sand from one bulb to another.' This distinguishes it from the other options listed.

Question: Galileo Galilei made a crucial observation while watching a lamp swing back and forth in a church. What significant conclusion did he draw from this observation that later influenced timekeeping technology?
A. Pendulums of different lengths always have the same swing duration
B. The time for each complete swing of a pendulum remains constant for a given length
C. Heavier objects swing faster than lighter objects
D. Longer threads produce faster oscillations than shorter ones
Show Answer & Explanation

Answer: (B) The time for each complete swing of a pendulum remains constant for a given length

Explanation:
According to the chapter, Galileo determined that 'the time taken to complete one oscillation was always the same for a pendulum of a given length,' which became the foundation for Huygens' later invention of the pendulum clock.

Question: In the experiment described in Activity 8.1, students construct a water clock by making a small hole in a bottle cap. Why is this practical experiment important for understanding ancient timekeeping methods?
A. It demonstrates that water always flows at the same rate regardless of the hole size
B. It shows how consistent water flow can mark equal time intervals, mirroring ancient designs
C. It proves that plastic bottles are superior to ceramic vessels for timekeeping
D. It measures time more accurately than any modern clock
Show Answer & Explanation

Answer: (B) It shows how consistent water flow can mark equal time intervals, mirroring ancient designs

Explanation:
The activity illustrates the principle behind ancient water clocks by showing how regular water dripping can indicate time intervals. Students mark the water level each minute to demonstrate how this principle worked historically.

Question: The chapter describes how different types of timekeeping devices operated in the past. Based on the descriptions given, which ancient device would have been least reliable during a cloudy day?
A. Water clock
B. Hourglass
C. Sundial
D. Candle clock
Show Answer & Explanation

Answer: (C) Sundial

Explanation:
A sundial depends on the shadow cast by the Sun during daylight. Cloudy weather would prevent sunlight from creating a clear shadow, making it impossible to read time accurately, whereas water clocks, hourglasses, and candle clocks work independently of weather conditions.

Question: When measuring the time period of a simple pendulum in Activity 8.2, why did students repeat the experiment multiple times and calculate an average?
A. To prove that the pendulum length must be exactly 100 cm
B. To ensure the bob's mass affects the final result equally each time
C. To account for small variations and obtain a more reliable value
D. To demonstrate that the time period changes with each oscillation
Show Answer & Explanation

Answer: (C) To account for small variations and obtain a more reliable value

Explanation:
Repeating measurements multiple times and averaging them is a standard scientific practice to reduce the effect of random errors. The 'Think Like a Scientist!' section acknowledges that slight differences may occur in different readings.

Question: The Samrat Yantra at Jantar Mantar in Jaipur is described as the world's largest stone sundial. At what approximate rate does its shadow move across the marked scale?
A. 1 metre per second
B. 1 millimetre per second
C. 1 centimetre per second
D. 10 millimetres per second
Show Answer & Explanation

Answer: (B) 1 millimetre per second

Explanation:
The 'Fascinating Facts' section explicitly states that the Samrat Yantra's shadow 'moves at about 1 millimetre per second and falls on a scale finely marked to measure time intervals as short as 2 seconds.'

Question: Based on the data provided in Table 8.3, what conclusion can be drawn about Train X and Train Y between 10:00 AM and 11:00 AM?
A. Both trains maintained the same constant speed throughout the time interval
B. Train X was in uniform motion while Train Y was in non-uniform motion
C. Train Y covered more total distance than Train X
D. Neither train was capable of uniform motion
Show Answer & Explanation

Answer: (B) Train X was in uniform motion while Train Y was in non-uniform motion

Explanation:
Train X covered exactly 20 km in each 10-minute interval, showing uniform motion. Train Y's distance varied (20, 15, 15, 25, 20, 25 km in successive intervals), demonstrating non-uniform motion. The chapter explicitly confirms this conclusion.

Question: If a train travels at 90 km/h and needs to cover 360 km, which formula from section 8.3.1 would correctly calculate the required travel time?
A. Time = Distance ÷ Speed
B. Time = Speed × Distance
C. Time = Speed ÷ Distance
D. Time = Distance + Speed
Show Answer & Explanation

Answer: (A) Time = Distance ÷ Speed

Explanation:
The chapter provides the formula 'Total time taken = Total distance covered / Speed.' This rearrangement allows calculation of time when distance and speed are known. Example 8.3 demonstrates this exact calculation resulting in 4 hours.

Question: When comparing the speeds of an Olympic sprinter in a 100-metre race versus a long-distance runner in a marathon, why would calculating average speed be essential for fair comparison?
A. Because sprinters always maintain constant speed while distance runners vary theirs
B. Because the two races cover different distances over different time periods
C. Because Olympic races are always faster than non-Olympic races
D. Because average speed is the only valid way to measure any motion
Show Answer & Explanation

Answer: (B) Because the two races cover different distances over different time periods

Explanation:
The chapter explains that average speed (total distance ÷ total time) allows meaningful comparison of objects traveling different distances in different times. This standardized approach enables fair evaluation across different race types and durations.

Question: According to the 'Dive Deeper' section on modern clocks, how does the precision of atomic clocks compare to Huygens' original pendulum clock?
A. Atomic clocks lose about 10 seconds daily while pendulum clocks were more accurate
B. Both types have identical accuracy levels
C. Atomic clocks lose only about 1 second in millions of years compared to pendulum clocks' 10-second daily loss
D. Pendulum clocks were actually more reliable for long-term use
Show Answer & Explanation

Answer: (C) Atomic clocks lose only about 1 second in millions of years compared to pendulum clocks' 10-second daily loss

Explanation:
The chapter states that Huygens' early pendulum clocks 'could gain or lose 10 seconds each day' while 'today's atomic clocks are so precise that they lose only one second in millions of years.' This dramatic improvement shows the evolution of timekeeping technology.

Question: Why was the development of the sinking bowl water clock (Ghatika-yantra) considered a significant advancement over the earlier flowing-out type of water clock?
A. It could measure time during nighttime while the other could not
B. It maintained consistent flow rate as water levels dropped, addressing a major limitation
C. It required less water to operate effectively
D. It was made from superior materials that lasted longer
Show Answer & Explanation

Answer: (B) It maintained consistent flow rate as water levels dropped, addressing a major limitation

Explanation:
The chapter notes that earlier flowing-out water clocks were inaccurate 'because as water levels dropped, the flow rate decreased.' The Ghatika-yantra solved this by using a floating bowl design, ensuring more consistent time measurement.

Question: When the chapter mentions that a speedometer measures vehicle speed in km/h while an odometer measures distance in kilometres, what relationship between these two measurements is being illustrated?
A. Distance and speed are the same quantity expressed differently
B. Speed is distance covered per unit time, making speedometer readings depend on time intervals
C. Odometers are more accurate than speedometers for all driving conditions
D. These instruments measure completely unrelated aspects of vehicle motion
Show Answer & Explanation

Answer: (B) Speed is distance covered per unit time, making speedometer readings depend on time intervals

Explanation:
The chapter's definition states that speed equals distance divided by time. A speedometer shows km/h (kilometre per hour), which inherently incorporates time as the denominator, while an odometer tracks the total distance. Together they relate to the speed formula.

Question: The chapter states that before modern devices existed, people used natural cycles like the rising and setting of the Sun to keep track of time. Which characteristic of these natural events made them useful for primitive timekeeping?
A. They occurred randomly at unpredictable intervals
B. They were visible only to people with special training
C. They repeated themselves after definite intervals in a reliable manner
D. They required complex mathematical calculations to interpret
Show Answer & Explanation

Answer: (C) They repeated themselves after definite intervals in a reliable manner

Explanation:
The chapter explains that humans 'started noticing that many events in nature repeat themselves after definite intervals of time' and 'started using the cycles of these events for timekeeping.' This reliability and regularity made them useful.

Question: In Activity 8.4, where students calculate train speeds from timetables, comparing Passenger, Express, and Superfast trains would most likely reveal which pattern?
A. All train types travel at identical speeds regardless of their classification
B. Superfast trains typically cover greater distances in the same time interval compared to Passenger trains
C. Passenger trains are always faster than Express trains on the same route
D. Train speed has no relationship to its classification type
Show Answer & Explanation

Answer: (B) Superfast trains typically cover greater distances in the same time interval compared to Passenger trains

Explanation:
The classification names themselves suggest different speed characteristics. The activity involves analyzing data to determine 'which is the fastest train, that is, the one with the highest speed,' implying students would discover that different train types have notably different speeds.

Question: In ancient times, people relied on repeating natural phenomena to develop methods for tracking the passage of time. Based on the chapter, which of the following was primarily used to establish the foundation for defining a day?
A. The phases of the Moon cycling through different shapes
B. The rising and setting of the Sun across the sky
C. The changing of the seasons throughout the year
D. The movement of stars in the night sky
Show Answer & Explanation

Answer: (B) The rising and setting of the Sun across the sky

Explanation:
The chapter explicitly states that a day was defined by the cycle of rising and setting of the Sun, which formed the basis for early calendar systems and timekeeping methods.

Question: When setting up a simple pendulum in Activity 8.2, students used a string length of approximately 100 cm and measured the time for 10 complete oscillations several times. Why was it necessary to divide the total time by 10?
A. To account for air resistance affecting the pendulum's motion
B. To calculate the time period, which is the time for one single oscillation
C. To verify that the pendulum was swinging at the same angle each time
D. To ensure the string remained taut throughout the experiment
Show Answer & Explanation

Answer: (B) To calculate the time period, which is the time for one single oscillation

Explanation:
The time period represents the duration for one complete oscillation. Since students measured 10 oscillations together, dividing by 10 yielded the time for a single oscillation, which is the definition of time period.

Question: The chapter describes various ancient timekeeping devices. Which device measured time based on the continuous and uniform burning of markings on its surface as it was consumed?
A. A water clock with a floating bowl design
B. A candle clock with time markings
C. A sundial tracking shadow movement
D. An hourglass with flowing sand
Show Answer & Explanation

Answer: (B) A candle clock with time markings

Explanation:
Candle clocks specifically used markings on the candle surface that indicated how much time had passed as the candle burned down. The chapter describes them as having markings that indicated the passage of time when burned.

Question: The Ghatika-yantra developed in ancient India shared a key design principle with the pendulum clock developed much later by Huygens. What was this shared principle?
A. • Both used gravitational force to drive regular, repeating motions • Both produced reliable measurements through constant, predictable cycles
B. • Both required external energy sources to operate continuously
C. • Both were used exclusively in religious temples and astronomical observatories
D. • Both measured time using the movement of water or liquid substances
Show Answer & Explanation

Answer: (A) • Both used gravitational force to drive regular, repeating motions • Both produced reliable measurements through constant, predictable cycles

Explanation:
Both the Ghatika-yantra and the pendulum clock relied on regular, repeating natural processes—water filling/sinking and pendulum oscillation—that occur at constant intervals, making them suitable for measuring time consistently.

Question: In the context of comparing object motions, if three runners finish a 400-metre race at different times—Runner A in 50 seconds, Runner B in 45 seconds, and Runner C in 48 seconds—what can be determined about their relative speeds during the race?
A. Runner A was fastest because she had the longest time to accelerate
B. Runner B was fastest because she covered the same distance in the least amount of time
C. Runner C was fastest because her time fell between the other two
D. All three runners had equal speeds because they ran the same distance
Show Answer & Explanation

Answer: (B) Runner B was fastest because she covered the same distance in the least amount of time

Explanation:
Speed is calculated as distance divided by time. Since all three covered the same distance (400 metres), the runner with the smallest time interval moved fastest. Runner B covered 400 metres in 45 seconds, resulting in the highest speed.

Question: When Prerna's school sports teacher uses a stopwatch to time races while Olympic officials use advanced electronic systems that measure to the thousandth of a second, what key difference in capability does this reveal?
A. Electronic timing systems are more expensive but no more accurate than stopwatches
B. Advanced systems can detect extremely small differences in finish times that human-operated stopwatches cannot resolve
C. Stopwatches are actually more reliable for determining winners in close races
D. The difference in timing methods makes no practical difference in identifying race winners
Show Answer & Explanation

Answer: (B) Advanced systems can detect extremely small differences in finish times that human-operated stopwatches cannot resolve

Explanation:
The chapter emphasises that Olympic timing is so advanced that it can identify winners even when sprinters appear to cross the finish line almost together. This precision in measuring fractional seconds is impossible with manual stopwatches, which is why electronic systems are essential for competitive sports.

Question: A car travels 180 kilometres in 3 hours. If you convert this speed to metres per second, what will be the result?
A. 16.67 m/s
B. 50 m/s
C. 60 m/s
D. 30 m/s
Show Answer & Explanation

Answer: (A) 16.67 m/s

Explanation:
Speed = 180 km ÷ 3 h = 60 km/h. To convert to m/s: 60 km/h × (1000 m/km) ÷ (3600 s/h) = 60000 ÷ 3600 = 16.67 m/s.

Question: Based on the description of ancient Indian timekeeping in the chapter, the Ghatika-yantra's bowl took exactly 24 minutes to fill and sink. How many such complete cycles would occur in a full 24-hour day?
A. 24 cycles
B. 60 cycles
C. 120 cycles
D. 100 cycles
Show Answer & Explanation

Answer: (B) 60 cycles

Explanation:
If one cycle takes 24 minutes and a day has 24 hours (which is 1440 minutes), then 1440 ÷ 24 = 60 complete cycles would occur in a 24-hour period. The chapter notes that a 24-hour day was divided into 60 equal ghatis based on this measurement.

Question: A train travels between two stations that are 150 kilometres apart. If the train takes 2.5 hours to complete this journey, what is its average speed, and would this train be classified as 'uniform' or 'non-uniform' in its motion?
A. The average speed is 60 km/h; the train exhibits uniform motion throughout
B. The average speed is 60 km/h; but the train likely exhibited non-uniform motion since real trains accelerate and decelerate
C. The average speed is 75 km/h; the train exhibits uniform motion throughout
D. The average speed is 75 km/h; but the train likely exhibited non-uniform motion since real trains accelerate and decelerate
Show Answer & Explanation

Answer: (B) The average speed is 60 km/h; but the train likely exhibited non-uniform motion since real trains accelerate and decelerate

Explanation:
Speed = 150 km ÷ 2.5 h = 60 km/h. However, the chapter emphasises that uniform motion is an idealisation—in reality, trains accelerate from rest, may vary speed during the journey, and decelerate upon arrival, making the motion non-uniform even though we calculate an average speed.

Question: Why did Galileo Galilei's observation of a church lamp swinging back and forth represent a crucial turning point in the development of mechanical timekeeping devices?
A. He discovered that lamps always swing at the fastest possible speed regardless of their initial push
B. He observed that the lamp's swings took equal time intervals consistently, suggesting a reliable mechanism for measuring time
C. He concluded that gravity was the only force needed to power any timekeeping device forever
D. He determined that heavier objects always swing faster than lighter objects
Show Answer & Explanation

Answer: (B) He observed that the lamp's swings took equal time intervals consistently, suggesting a reliable mechanism for measuring time

Explanation:
The chapter describes how Galileo used his pulse to measure time and found that each swing of the lamp took the same duration. This regularity led him to conclude that pendulums of a given length always take the same time for each oscillation—a discovery that Huygens later used to create the pendulum clock.

Question: A vehicle moves along a straight highway and covers the following distances in equal 10-minute time intervals: 20 km, 20 km, 20 km, and 20 km. Based on this pattern, what type of motion is the vehicle exhibiting, and what could be concluded about its speed?
A. Non-uniform motion with constantly changing speed throughout the journey
B. Uniform linear motion with constant speed of approximately 120 km/h
C. Non-uniform motion because the vehicle must have accelerated initially to reach this speed
D. Uniform circular motion since the distance covered remains constant
Show Answer & Explanation

Answer: (B) Uniform linear motion with constant speed of approximately 120 km/h

Explanation:
According to the definition in section 8.4, when an object covers equal distances in equal time intervals, it exhibits uniform linear motion at constant speed. Here, 20 km every 10 minutes equals 120 km/h, which is consistent and unchanging.

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