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All questions of Motion and Time for Class 7 Exam
A car is moving with 72 km/hrs. The speed of the car in m/s is
- a)30 m/s
- b)20 m/s
- c)40 m/s
- d)25 m/s
Correct answer is option 'B'. Can you explain this answer?
A car is moving with 72 km/hrs. The speed of the car in m/s is
a)
30 m/s
b)
20 m/s
c)
40 m/s
d)
25 m/s
|
Meera Reddy answered |
We know ,
1 km=1000m , 1 hour=3600s
1km/h=1000/3600m/s=5/18m/s
72km/h=72×5/18m/s
=4×5m/s
=20m/s.
1 km=1000m , 1 hour=3600s
1km/h=1000/3600m/s=5/18m/s
72km/h=72×5/18m/s
=4×5m/s
=20m/s.
Stopwatch is used to measure- a)Total distance traveled
- b)Exact time during the event
- c)Correct time
- d)All of these
Correct answer is option 'B'. Can you explain this answer?
Stopwatch is used to measure
a)
Total distance traveled
b)
Exact time during the event
c)
Correct time
d)
All of these
|
Ishani Banerjee answered |
Stop watch is used to measure exact time during an event like race.
The speed of the vehicle is recorded by
- a)Ammeter
- b)Odometer
- c)Speedometer
- d)Voltmeter
Correct answer is option 'C'. Can you explain this answer?
The speed of the vehicle is recorded by
a)
Ammeter
b)
Odometer
c)
Speedometer
d)
Voltmeter
|
Jyoti Kulkarni answered |
- The speedometer is a device found in vehicles that measures the current speed of the vehicle.
- It provides real-time information, allowing drivers to maintain safe speeds and abide by traffic regulations.
- Unlike an odometer, which measures distance traveled, the speedometer focuses solely on speed.
- Ammeter and voltmeter measure electrical current and voltage, respectively, and are not related to vehicle speed.
Topic in NCERT: Measuring Speed
Line in NCERT: "The speedometer records the speed directly in km/h."
What kind of motion a bullet shows when fired from a gun?
- a)Translatory motion
- b)Random motion
- c)Non - Linear motion
- d)Non-periodic motion.
Correct answer is option 'A'. Can you explain this answer?
What kind of motion a bullet shows when fired from a gun?
a)
Translatory motion
b)
Random motion
c)
Non - Linear motion
d)
Non-periodic motion.
|
Anshu Basu answered |
A bullet fired from a gun shows linear motion as it goes straight in one direction.
Change in position with respect to the surroundings is called
- a)Acceleration
- b)Speed
- c)Momentum
- d)Force
Correct answer is option 'B'. Can you explain this answer?
Change in position with respect to the surroundings is called
a)
Acceleration
b)
Speed
c)
Momentum
d)
Force
|
Lakshmi Reddy answered |
The change in position with respect to the surroundings is called Speed
- Speed is the measure of how quickly an object moves from one position to another. It is calculated as the distance traveled divided by the time taken to travel that distance.
Line in NCERT: "The distance moved by an object in a unit time is called its speed."
When the motion of the object is not along a fixed path with changing direction- a)Random motion
- b)Oscillatory motion
- c)Periodic motion
- d)Circular motion.
Correct answer is option 'A'. Can you explain this answer?
When the motion of the object is not along a fixed path with changing direction
a)
Random motion
b)
Oscillatory motion
c)
Periodic motion
d)
Circular motion.
|
Sanchita Sen answered |
When the motion of the object is not along a fixed path with changing direction, the motion of body is random motion.
Odometer is used to measure- a)Speed of the vehicles
- b)Size of the vehicles
- c)Total distance traveled
- d)Total time taken
Correct answer is option 'C'. Can you explain this answer?
Odometer is used to measure
a)
Speed of the vehicles
b)
Size of the vehicles
c)
Total distance traveled
d)
Total time taken
|
Mira Chakraborty answered |
Odometer is used to measure total distance travelled by the vehicle.
The meter that is used to measure the distance moved by the vehicle is known as _____- a)Speedometer
- b)Odometer
- c)Chronometer
- d)Ammeter
Correct answer is option 'B'. Can you explain this answer?
The meter that is used to measure the distance moved by the vehicle is known as _____
a)
Speedometer
b)
Odometer
c)
Chronometer
d)
Ammeter
|
Gauri Chopra answered |
An odometer or odograph is an instrument used for measuring the distance travelled by a vehicle, such as a bicycle or car. The device may be electronic, mechanical, or a combination of the two. Early forms of the odometer existed in the ancient Greco-Roman world as well as ancient China. In countries where Imperial units or US customary units are used, it is sometimes called a mileometer or milometer, the former name especially being prevalent in the United Kingdom and members of the Commonwealth.
The basic unit of speed is:
- a)km/min
- b)m/min
- c)km/h
- d)m/s
Correct answer is option 'D'. Can you explain this answer?
The basic unit of speed is:
a)
km/min
b)
m/min
c)
km/h
d)
m/s
|
Kavya Rane answered |
The basic unit of distance is metre (m). The basic unit of time is second (s). Since we know that s=d/t. Therefore, the basic unit of speed is m/s.
So option D is the correct answer.
Speed time graph is straight line for- a)Non-uniform motion
- b)Constant motion Uniform motion
- c)Uniform motion
- d)Accelerated motion
Correct answer is option 'C'. Can you explain this answer?
Speed time graph is straight line for
a)
Non-uniform motion
b)
Constant motion Uniform motion
c)
Uniform motion
d)
Accelerated motion
|
Kiran Bajaj answered |
When the slope of distance-time graph is a straight line parallel to time axis, the object is moving with uniform motion.
Pendulum of a given length always takes- a)Equal times in some oscillation
- b)Unequal times in one oscillation
- c)Equal times in one oscillation
- d)Unequal times in some oscillation
Correct answer is option 'C'. Can you explain this answer?
Pendulum of a given length always takes
a)
Equal times in some oscillation
b)
Unequal times in one oscillation
c)
Equal times in one oscillation
d)
Unequal times in some oscillation
|
Divyansh Chaudhary answered |
Pendulum of a given length always takes equal times in one oscillation called time period of the pendulum.
What is the speed of a car that travels 15 km in 20 minutes, expressed in km/h?
- a)35 km/h
- b)40 km/h
- c)45 km/h
- d)50 km/h
Correct answer is option 'C'. Can you explain this answer?
What is the speed of a car that travels 15 km in 20 minutes, expressed in km/h?
a)
35 km/h
b)
40 km/h
c)
45 km/h
d)
50 km/h
|
Vidhi bajaj answered |
Calculation:
- Distance traveled = 15 km
- Time taken = 20 minutes = 20/60 hours = 1/3 hours
Formula:
- Speed = Distance/Time
Calculation:
- Speed = 15 km / (1/3) hours
- Speed = 15 km * 3
- Speed = 45 km/h
Therefore, the speed of the car that travels 15 km in 20 minutes is 45 km/h.
- Distance traveled = 15 km
- Time taken = 20 minutes = 20/60 hours = 1/3 hours
Formula:
- Speed = Distance/Time
Calculation:
- Speed = 15 km / (1/3) hours
- Speed = 15 km * 3
- Speed = 45 km/h
Therefore, the speed of the car that travels 15 km in 20 minutes is 45 km/h.
Total distance covered by a body in unit interval of time in particular direction is called- a)Speed
- b)Momentum
- c)Velocity
- d)Motion
Correct answer is option 'C'. Can you explain this answer?
Total distance covered by a body in unit interval of time in particular direction is called
a)
Speed
b)
Momentum
c)
Velocity
d)
Motion
|
Sonia Menon answered |
Velocity
- Velocity is defined as the total distance covered by an object in a particular direction per unit interval of time. It is a vector quantity, which means it has both magnitude and direction.
- When we talk about the total distance covered by a body, we are considering the distance traveled in a specific direction within a given time interval.
Speed
- Speed, on the other hand, is the total distance covered by an object per unit interval of time. It is a scalar quantity, which means it only has magnitude and no direction.
- Speed does not take into account the direction of motion, it only considers the magnitude of the distance covered.
Momentum
- Momentum is a property of a moving object that depends on both its mass and velocity. It is defined as the product of an object's mass and its velocity.
- Momentum is a vector quantity because it takes into account both the direction and magnitude of the object's velocity.
Motion
- Motion refers to the change in position of an object over time. It can be described in terms of distance, displacement, speed, velocity, and acceleration.
- Motion can be in any direction and can be characterized by the change in position of the object with respect to a reference point.
Conclusion
- In this context, the total distance covered by a body in a unit interval of time in a particular direction is called velocity.
- Velocity is a vector quantity that considers both the magnitude of the distance covered and the direction of motion.
- It is important to understand the difference between velocity, speed, momentum, and motion as they are distinct concepts in physics.
- Velocity is defined as the total distance covered by an object in a particular direction per unit interval of time. It is a vector quantity, which means it has both magnitude and direction.
- When we talk about the total distance covered by a body, we are considering the distance traveled in a specific direction within a given time interval.
Speed
- Speed, on the other hand, is the total distance covered by an object per unit interval of time. It is a scalar quantity, which means it only has magnitude and no direction.
- Speed does not take into account the direction of motion, it only considers the magnitude of the distance covered.
Momentum
- Momentum is a property of a moving object that depends on both its mass and velocity. It is defined as the product of an object's mass and its velocity.
- Momentum is a vector quantity because it takes into account both the direction and magnitude of the object's velocity.
Motion
- Motion refers to the change in position of an object over time. It can be described in terms of distance, displacement, speed, velocity, and acceleration.
- Motion can be in any direction and can be characterized by the change in position of the object with respect to a reference point.
Conclusion
- In this context, the total distance covered by a body in a unit interval of time in a particular direction is called velocity.
- Velocity is a vector quantity that considers both the magnitude of the distance covered and the direction of motion.
- It is important to understand the difference between velocity, speed, momentum, and motion as they are distinct concepts in physics.
Distance traveled = ____________ x Time.- a)Velocity
- b)Momentum
- c)Speed
- d)Displacement
Correct answer is option 'C'. Can you explain this answer?
Distance traveled = ____________ x Time.
a)
Velocity
b)
Momentum
c)
Speed
d)
Displacement
|
Akshara Das answered |
All of the calculations in this section will be worked out using the distance, speed and time equation. An easy way to remember the distance, speed and time equations is to put the letters into a triangle.
The triangles will help you remember these 3 rules:
Distance = Speed x Time
Time = Distance/Speed
Speed = Distance/Time
Time taken to complete one vibration is called- a)Pulse
- b)Time length
- c)Time period
- d)Vibration
Correct answer is option 'C'. Can you explain this answer?
Time taken to complete one vibration is called
a)
Pulse
b)
Time length
c)
Time period
d)
Vibration
|
|
Prisha Mehta answered |
The time taken by pendulum bob to complete one vibration or one oscillation is called the time period of pendulum. The time taken by a vibrating object to complete one vibration is called its time period.
When a body covers equal distance in equal interval of time. The speed of the body is called as- a)Average speed
- b)Non-uniform speed
- c)Uniform speed
- d)Linear speed
Correct answer is option 'C'. Can you explain this answer?
When a body covers equal distance in equal interval of time. The speed of the body is called as
a)
Average speed
b)
Non-uniform speed
c)
Uniform speed
d)
Linear speed
|
Nabanita Patel answered |
When a body covers equal distance in equal interval of time, the speed of the body is called as uniform motion.
Mineral used in crystal form in watch is- a)Quartz
- b)Gold
- c)Silver
- d)Lead
Correct answer is option 'A'. Can you explain this answer?
Mineral used in crystal form in watch is
a)
Quartz
b)
Gold
c)
Silver
d)
Lead
|
Madhurima Kulkarni answered |
Quartz is used in crystal form in watch that gives very accurate time.
The distance-time graph of the non-uniform motion is a _________ line- a)straight
- b)straight then curved
- c)curved
- d)none of these
Correct answer is option 'C'. Can you explain this answer?
The distance-time graph of the non-uniform motion is a _________ line
a)
straight
b)
straight then curved
c)
curved
d)
none of these
|
Praveen Kumar answered |
The distance-time graph of the non-uniform motion is a curved line as it covers unequal distances in equal intervals of time, hence option A is correct.
Time interval of 1000 years is called- a)A millennium
- b)Trillion
- c)Century
- d)Decade
Correct answer is option 'A'. Can you explain this answer?
Time interval of 1000 years is called
a)
A millennium
b)
Trillion
c)
Century
d)
Decade
|
Prateek Sharma answered |
The time interval of 1000 years is called a millennium.
speedometer fitted on dashboard of car measures- a)Speed of car at particular moment
- b)Average speed of the car
- c)Initial speed of car
- d)Final speed of the car
Correct answer is option 'A'. Can you explain this answer?
speedometer fitted on dashboard of car measures
a)
Speed of car at particular moment
b)
Average speed of the car
c)
Initial speed of car
d)
Final speed of the car
|
|
Nabanita Patel answered |
Speedometer is fitted on dashboard of car measures the speed of car at particular moment of time.
Which of the following motions is characterized by an object moving back and forth along the same path?- a)Circular motion
- b)Linear motion
- c)Oscillatory motion
- d)Random motion
Correct answer is option 'C'. Can you explain this answer?
a)
Circular motion
b)
Linear motion
c)
Oscillatory motion
d)
Random motion
|
|
Vaibhav Goyal answered |
Understanding Oscillatory Motion
Oscillatory motion is a specific type of movement where an object moves back and forth along the same path. This motion can be observed in various everyday scenarios and is characterized by a repetitive cycle.
Key Characteristics of Oscillatory Motion:
- Back and Forth Movement: The defining feature of oscillatory motion is that the object returns to its original position after moving in one direction, then reverses to move in the opposite direction.
- Examples: Common examples include a swinging pendulum, vibrations of a guitar string, or the motion of a spring when compressed and released.
- Time Period: This motion is periodic, meaning it occurs in cycles over a fixed time interval, known as the time period.
- Equilibrium Position: The object oscillates around a central point or equilibrium position, where it would be at rest if not for the oscillatory forces acting on it.
Why Other Motions Are Not Oscillatory:
- Circular Motion: In circular motion, an object moves in a circular path, which does not involve returning along the same path.
- Linear Motion: Linear motion involves movement in a straight line, without the back-and-forth characteristic of oscillatory motion.
- Random Motion: Random motion lacks any predictable pattern, unlike the orderly back-and-forth nature of oscillatory motion.
In summary, oscillatory motion is distinct due to its repetitive back-and-forth movement along the same path, making option 'C' the correct answer.
Oscillatory motion is a specific type of movement where an object moves back and forth along the same path. This motion can be observed in various everyday scenarios and is characterized by a repetitive cycle.
Key Characteristics of Oscillatory Motion:
- Back and Forth Movement: The defining feature of oscillatory motion is that the object returns to its original position after moving in one direction, then reverses to move in the opposite direction.
- Examples: Common examples include a swinging pendulum, vibrations of a guitar string, or the motion of a spring when compressed and released.
- Time Period: This motion is periodic, meaning it occurs in cycles over a fixed time interval, known as the time period.
- Equilibrium Position: The object oscillates around a central point or equilibrium position, where it would be at rest if not for the oscillatory forces acting on it.
Why Other Motions Are Not Oscillatory:
- Circular Motion: In circular motion, an object moves in a circular path, which does not involve returning along the same path.
- Linear Motion: Linear motion involves movement in a straight line, without the back-and-forth characteristic of oscillatory motion.
- Random Motion: Random motion lacks any predictable pattern, unlike the orderly back-and-forth nature of oscillatory motion.
In summary, oscillatory motion is distinct due to its repetitive back-and-forth movement along the same path, making option 'C' the correct answer.
Slope of distance time graph represent- a)Distance travelled
- b)Speed
- c)Momentum
- d)Velocity
Correct answer is option 'B'. Can you explain this answer?
Slope of distance time graph represent
a)
Distance travelled
b)
Speed
c)
Momentum
d)
Velocity
|
Jithin Chawla answered |
In a distance-time graph slope represents the speed of the body and particular interval of time.
Number of vibration per second is called- a)Speed
- b)Wavelength
- c)Motion
- d)Frequency
Correct answer is option 'D'. Can you explain this answer?
Number of vibration per second is called
a)
Speed
b)
Wavelength
c)
Motion
d)
Frequency
|
Sanjana Kumar answered |
The number of vibrations of the medium particle per second is called as the frequency of sound wave. For example if a particle of medium undergoes 200 vibrations in one second then the frequency of sound wave is 200 vibrations per second. The SI unit of frequency is hertz.
Which of the following is an example of non-uniform motion?- a)Movement of an asteroid
- b)A car coming to a halt
- c)A bouncing ball
- d)All of these
Correct answer is option 'D'. Can you explain this answer?
Which of the following is an example of non-uniform motion?
a)
Movement of an asteroid
b)
A car coming to a halt
c)
A bouncing ball
d)
All of these
|
Aryan Mukherjee answered |
Non-uniform Motion:
Movement of an asteroid, a car coming to a halt, and a bouncing ball are all examples of non-uniform motion. Non-uniform motion refers to an object moving at varying speeds or changing its direction over time.
Movement of an Asteroid:
- An asteroid moving through space does not maintain a constant speed as it is influenced by gravitational forces from other celestial bodies. It may speed up or slow down as it travels through the solar system.
A Car Coming to a Halt:
- When a car is slowing down to come to a stop, it is experiencing non-uniform motion. Initially, the car is moving at a certain speed, but as the brakes are applied, the speed decreases until it eventually comes to a complete stop.
A Bouncing Ball:
- A bouncing ball is another example of non-uniform motion. When a ball is thrown or dropped, it accelerates towards the ground due to gravity. Upon hitting the ground, it bounces back up, changing its speed and direction multiple times during the bouncing process.
Conclusion:
- All three examples exhibit non-uniform motion because they involve changes in speed or direction over time. Understanding non-uniform motion is essential in physics as it helps to describe the motion of objects in real-world scenarios.
A train travels at a speed of 60 km/h. How far will it travel in 4 hours?- a)15 km
- b)230 km
- c)60km
- d)240km
Correct answer is option 'D'. Can you explain this answer?
A train travels at a speed of 60 km/h. How far will it travel in 4 hours?
a)
15 km
b)
230 km
c)
60km
d)
240km
|
Coachify answered |
- The speed of the train is 60 km/h.
- The train travels for 4 hours.
- Distance is calculated using the formula: Distance = Speed × Time.
- Substitute the values: Distance = 60 km/h × 4 hours = 240 km.
- Thus, the train will travel 240 km in 4 hours
Correct Answer -Option D
A scooterist travels at 30 km/h along a straight path for 20 minutes. What is the distance traveled?- a)10 km
- b)1.5 km
- c)6 km
- d)90 km
Correct answer is option 'A'. Can you explain this answer?
A scooterist travels at 30 km/h along a straight path for 20 minutes. What is the distance traveled?
a)
10 km
b)
1.5 km
c)
6 km
d)
90 km
|
Tutorpedia Coaching answered |
If the scooter is travelling at precisely 30km/h in a perfectly straight line.
We know 1 hour=60 minutes
Therefore to calculate the distance traveled in the started fraction of the hour.
Therefore 10km is the distance traveled in 20 minutes of travelling at a speed of 30km/h
We know 1 hour=60 minutes
Therefore to calculate the distance traveled in the started fraction of the hour.
Therefore 10km is the distance traveled in 20 minutes of travelling at a speed of 30km/h
To and fro movement of body is termed as- a)Vibratory motion
- b)Oscillatory motion
- c)Circular and periodic motion.
- d)Periodic motion
Correct answer is option 'B'. Can you explain this answer?
To and fro movement of body is termed as
a)
Vibratory motion
b)
Oscillatory motion
c)
Circular and periodic motion.
d)
Periodic motion
|
Dipanjan Goyal answered |
To and from movement of a body is called as oscillatory motion.
Speed is scalar quantity but velocity is a- a)Either scalar or vector
- b)Vector quantity
- c)Neither vector nor scalar
- d)Also scalar quantity
Correct answer is option 'B'. Can you explain this answer?
Speed is scalar quantity but velocity is a
a)
Either scalar or vector
b)
Vector quantity
c)
Neither vector nor scalar
d)
Also scalar quantity
|
Rhea Khanna answered |
Speed is a scalar quantity but velocity is vector quantity because velocity has both magnitude and direction.
Car travels first 60 km of a distance in 1 hr, next 70 km of the distance in next hour and remaining 20 km distance in final hour. Find its type of motion
- a)uniform motion
- b)non-uniform motion
- c)either uniform or non-uniform motion
- d)neither uniform nor non-uniform motion
Correct answer is option 'B'. Can you explain this answer?
Car travels first 60 km of a distance in 1 hr, next 70 km of the distance in next hour and remaining 20 km distance in final hour. Find its type of motion
a)
uniform motion
b)
non-uniform motion
c)
either uniform or non-uniform motion
d)
neither uniform nor non-uniform motion
|
|
Praveen Kumar answered |
So, the car travels different distances in equal time intervals. This is an example of non-uniform motion.
If a simple pendulum completes 20 oscillations in 32 seconds, what is its time period?
- a)1.6 s
- b)2.0 s
- c)2.5 s
- d)3.2 s
Correct answer is option 'A'. Can you explain this answer?
If a simple pendulum completes 20 oscillations in 32 seconds, what is its time period?
a)
1.6 s
b)
2.0 s
c)
2.5 s
d)
3.2 s
|
|
Trisha malhotra answered |
Understanding the Problem
To find the time period of a simple pendulum, we need to understand the relationship between the number of oscillations and the total time taken for those oscillations.
Given Data
- Total oscillations = 20
- Total time = 32 seconds
Calculating Time Period
The time period (T) of a pendulum is defined as the time it takes to complete one full oscillation. We can calculate it using the formula:
Now, substituting the given values into the formula:
Conclusion
Thus, the time period of the pendulum is 1.6 seconds. Therefore, the correct answer is option 'A'.
Key Takeaways
- The time period indicates how long it takes for one complete oscillation.
- This calculation is essential in understanding the dynamics of pendulums, which are a fundamental concept in physics.
With this understanding, you can confidently solve similar problems involving simple harmonic motion and pendulums!
To find the time period of a simple pendulum, we need to understand the relationship between the number of oscillations and the total time taken for those oscillations.
Given Data
- Total oscillations = 20
- Total time = 32 seconds
Calculating Time Period
The time period (T) of a pendulum is defined as the time it takes to complete one full oscillation. We can calculate it using the formula:
- Time Period (T) = Total Time / Number of Oscillations
Now, substituting the given values into the formula:
- T = 32 seconds / 20 oscillations
- T = 1.6 seconds
Conclusion
Thus, the time period of the pendulum is 1.6 seconds. Therefore, the correct answer is option 'A'.
Key Takeaways
- The time period indicates how long it takes for one complete oscillation.
- This calculation is essential in understanding the dynamics of pendulums, which are a fundamental concept in physics.
With this understanding, you can confidently solve similar problems involving simple harmonic motion and pendulums!
Rajdhini express moves at a speed of 150 km/h. How long will it take to cover a distance of 15 km?- a)1.125 h
- b)2.125 h
- c)3.125 h
- d)0.1 h
Correct answer is option 'D'. Can you explain this answer?
Rajdhini express moves at a speed of 150 km/h. How long will it take to cover a distance of 15 km?
a)
1.125 h
b)
2.125 h
c)
3.125 h
d)
0.1 h
|
|
Praveen Kumar answered |
Given,
speed v = 150 km/h
distance cover = displacement d=15 km (Assume express is not changing its direction)
speed v = 150 km/h
distance cover = displacement d=15 km (Assume express is not changing its direction)
Time taken t = 0.1 hr
To and fro movement along an axis is called- a)Oscillation
- b)Frequency
- c)Reverberation
- d)None of the above
Correct answer is option 'A'. Can you explain this answer?
To and fro movement along an axis is called
a)
Oscillation
b)
Frequency
c)
Reverberation
d)
None of the above
|
Nidhi Nair answered |
To and fro movement of a body along an axis is called oscillation.
Watch used to measure short interval of time is- a)Stop watch
- b)Pendulum watch
- c)Atom watch
- d)Quartz watch
Correct answer is option 'A'. Can you explain this answer?
Watch used to measure short interval of time is
a)
Stop watch
b)
Pendulum watch
c)
Atom watch
d)
Quartz watch
|
Sonal Dasgupta answered |
Stop watch is used to measure short interval of time duration involving any event.
Which of the following does not express a time interval?- a)Time of the first bell in the school
- b)A day
- c)A second
- d)A school period
Correct answer is option 'A'. Can you explain this answer?
Which of the following does not express a time interval?
a)
Time of the first bell in the school
b)
A day
c)
A second
d)
A school period
|
|
Sunehri Choudhary answered |
Explanation:
The correct answer is option 'A' - Time of the first bell in the school.
Time intervals:
Time intervals refer to a specific duration or period of time. They measure the amount of time between two points or events.
Options:
a) Time of the first bell in the school:
This option does not express a time interval. It refers to a specific point in time when the first bell rings in the school. It does not indicate a duration or a period of time. Therefore, it is not an example of a time interval.
b) A day:
A day represents a time interval. It refers to a period of 24 hours, starting from midnight and ending at the next midnight. It is a commonly used unit of time to measure the duration of various activities or events.
c) A second:
A second is another example of a time interval. It is a unit of time measurement in the International System of Units (SI). It represents a duration of 1/60th of a minute or 1/3,600th of an hour. It is commonly used to measure short durations or intervals.
d) A school period:
A school period is also a time interval. It refers to a specific duration of time allocated for a particular subject or activity in a school. It can vary in length depending on the school's schedule and may range from a few minutes to an hour.
Conclusion:
Out of the given options, the only one that does not express a time interval is option 'A' - Time of the first bell in the school. This option refers to a specific point in time rather than a duration or period of time.
The correct answer is option 'A' - Time of the first bell in the school.
Time intervals:
Time intervals refer to a specific duration or period of time. They measure the amount of time between two points or events.
Options:
a) Time of the first bell in the school:
This option does not express a time interval. It refers to a specific point in time when the first bell rings in the school. It does not indicate a duration or a period of time. Therefore, it is not an example of a time interval.
b) A day:
A day represents a time interval. It refers to a period of 24 hours, starting from midnight and ending at the next midnight. It is a commonly used unit of time to measure the duration of various activities or events.
c) A second:
A second is another example of a time interval. It is a unit of time measurement in the International System of Units (SI). It represents a duration of 1/60th of a minute or 1/3,600th of an hour. It is commonly used to measure short durations or intervals.
d) A school period:
A school period is also a time interval. It refers to a specific duration of time allocated for a particular subject or activity in a school. It can vary in length depending on the school's schedule and may range from a few minutes to an hour.
Conclusion:
Out of the given options, the only one that does not express a time interval is option 'A' - Time of the first bell in the school. This option refers to a specific point in time rather than a duration or period of time.
The earliest clocks for measuring time during day were- a)Sand clocks
- b)Pendulum clocks
- c)Sundials
- d)Stop watches
Correct answer is option 'C'. Can you explain this answer?
The earliest clocks for measuring time during day were
a)
Sand clocks
b)
Pendulum clocks
c)
Sundials
d)
Stop watches
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Rainbow Rise Classes answered |
Sundials utilize the position of the sun to cast a shadow, indicating the time, and are considered one of the first devices used to measure time, dating back to ancient Egypt.
- Sand clocks: While ancient, sand clocks are not considered the earliest timekeeping devices.
- Pendulum clocks: These were developed much later than sundials.
- Stopwatches: Stopwatches are designed to measure specific time intervals, not the time of day, and came about even later than pendulum clocks.
Topic in NCERT: Units of time and speed
Line in NCERT: "Sundials"
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