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Q1. The word ‘metre’ comes from the Greek word:
The word ‘metre’ comes from the Greek word ‘metron’, which means ‘to measure’. The ancient Greeks used this term for measuring length. This is why the standard unit of length is called the metre.
Q2. The ancient unit of length based on the distance from the elbow to the tip of the middle finger is called:
The cubit was an ancient unit of length used by Egyptians and many other civilizations. It was based on the distance from the elbow to the tip of the middle finger. However, this unit was not very accurate because different people have different arm lengths.
Q3. The ancient unit of length based on the width of a finger is called:
Angula was an ancient unit of length used in India and other parts of Asia. It was based on the width of a finger. Since fingers come in different sizes, this unit was not reliable for accurate measurements.
Q4. The ancient unit of length based on the distance between the thumb and the little finger when stretched is called:
A handspan is the distance between the tip of the thumb and the tip of the little finger when the hand is fully stretched. It was used as a unit of measurement in ancient times. However, it was not accurate because handspans vary from person to person.
Q5. The ancient unit of length based on the length of a human foot is called:
The foot was an ancient unit of length based on the length of a human foot. It was used by many ancient civilizations, including the Romans and the Greeks. Today, the foot is still used in some countries but is defined as exactly 0.3048 metres.
Q6. The ancient unit of length based on the width of a closed fist is called:
Muthi is an ancient unit of length based on the width of a closed fist. It was used in some parts of India. However, like other non-standard units, it varied from person to person and was not accurate.
Q7. 1 metre is equal to how many centimetres?
One metre is equal to 100 centimetres. The metre is the base unit of length in the SI system, and the centimetre is a smaller unit derived from it. This relationship is based on the decimal system, which makes conversions easy.
Q8. 1 metre is equal to how many millimetres?
One metre is equal to 1000 millimetres. The millimetre is a very small unit of length used for measuring tiny objects. Since there are 10 millimetres in a centimetre and 100 centimetres in a metre, 1 metre equals 1000 millimetres.
Q9. 1 kilometre is equal to how many metres?
One kilometre is equal to 1000 metres. The kilometre is a larger unit of length used for measuring long distances. It is commonly used to measure distances between cities and towns.
Q10. The length of a curved line can be measured using a:
The length of a curved line can be measured by placing a thread along the curve and then measuring the length of the thread with a ruler. This method is simple and effective for measuring curved lines. A flexible measuring tape can also be used for this purpose.
Q11. To measure the length of a curved line, you should:
A straight ruler cannot measure a curved line directly. The correct method is to place a thread along the curve, mark the ends, and then straighten the thread to measure its length with a ruler. This gives the approximate length of the curved line.
Q12. The metre is defined using:
Today, the metre is defined as the distance light travels in a vacuum in 1/299,792,458 of a second. This definition is based on the speed of light, which is constant and does not change. It is the most accurate definition of the metre.
Q13. The Greek word ‘metron’ means:
The Greek word ‘metron’ means ‘to measure’. This word is the root of the word ‘metre’, which is the standard unit of length. The Greeks used this term in their system of measurement.
Q14. The ancient unit of length ‘cubit’ was commonly used in:
The cubit was used as a unit of length in many ancient civilizations, including Egypt, India and Rome. It was based on the length of the forearm from the elbow to the tip of the middle finger. However, it varied from place to place.
Q15. The SI unit of length is:
The metre is the SI unit of length. It is the base unit from which other units like centimetre, kilometre and millimetre are derived. The metre is used worldwide for scientific and commercial purposes.
Q16. The unit of length commonly used to measure the height of a person is the:
The height of a person is commonly measured in metres and centimetres. A person’s height is usually expressed as, for example, 1.65 metres or 165 centimetres. This is a convenient way to express human height.
Q17. The unit of length commonly used to measure the distance between two towns is the:
The distance between two towns is commonly measured in kilometres. Since towns are far apart, using metres would give very large numbers. Kilometres make the measurement more convenient and easier to understand.
Q18. The unit of length commonly used to measure the thickness of a coin is the:
The thickness of a coin is very small and is best measured in millimetres. A coin is usually a few millimetres thick. Millimetres provide a precise measurement for small objects.
Q19. The motion of a car moving on a straight road is an example of:
A car moving on a straight road shows linear motion because it moves along a straight path. Linear motion is the movement of an object in a straight line. This is the simplest type of motion.
Q20. The motion of a merry-go-round is an example of:
A merry-go-round moves in a circular path around its centre. This is an example of circular motion. In circular motion, the object moves along the circumference of a circle.
Q21. The to and fro motion of a pendulum is an example of:
A pendulum swings back and forth in a regular pattern. This to and fro motion is called oscillatory motion. Oscillatory motion is a type of periodic motion that repeats itself regularly.
Q22. The motion of a child on a swing is an example of:
A child on a swing moves back and forth in a regular pattern. This is oscillatory motion. The swing moves like a pendulum, repeating its path at regular intervals.
Q23. The movement of a spinning top is an example of:
A spinning top rotates around its own axis. This type of motion is called rotational motion. Rotational motion is a type of circular motion where the object spins around a fixed point or axis.
Q24. The movement of the Earth around the Sun is an example of:
The Earth moves around the Sun in a nearly circular path. This is an example of circular motion. The Earth’s motion around the Sun is also periodic because it repeats every year.
Q25. The movement of a pendulum from one extreme to the other and back is called:
One complete to and fro movement of a pendulum, from one extreme to the other and back, is called one oscillation. For example, if a pendulum swings from left to right and then back to left, it has completed one oscillation.
Q26. If an object is in motion, its position changes with respect to:
Motion is the change in position of an object with respect to a reference point. A reference point is a fixed object or point that helps us determine whether an object is moving or at rest. Without a reference point, we cannot define motion.
Q27. An object is said to be at rest if its position does not change with respect to:
An object is at rest if it does not change its position with respect to a reference point. For example, a book on a table is at rest because its position relative to the table does not change. Rest and motion are relative terms.
Q28. Rest and motion are relative terms because:
Rest and motion are relative terms because they depend on the reference point. An object may be at rest with respect to one reference point but in motion with respect to another. For example, a passenger in a moving train is at rest with respect to the train but in motion with respect to the ground.
Q29. A passenger sitting in a moving train is at rest with respect to:
A passenger sitting in a moving train is at rest with respect to the train because their position relative to the train does not change. However, with respect to the ground or a tree outside, the passenger is in motion. This shows that rest and motion are relative.
Q30. A person standing on the ground is in motion with respect to:
A person standing on the ground is at rest with respect to the ground but is in motion with respect to the Sun because the Earth is moving around the Sun. This shows that motion depends on the reference point chosen.
Q31. The ancient unit of length based on the width of a finger is called:
Angula is an ancient unit of length based on the width of a finger. It was used in India for measuring small lengths. Since finger widths vary, it was not a standard unit.
Q32. The ancient unit of length based on the width of a closed fist is called:
Muthi is an ancient unit of length based on the width of a closed fist. It was used in some parts of India. Like other non-standard units, it was not accurate.
Q33. 1 centimetre is equal to how many millimetres?
One centimetre is equal to 10 millimetres. The millimetre is a smaller unit of length used for very precise measurements. This relationship is based on the decimal system.
Q34. The motion of a train on a railway track is an example of:
A train moving on a straight railway track shows linear motion because it moves along a straight line. Linear motion is the movement of an object in a straight line. If the track curves, it becomes curvilinear motion.
Q35. The motion of a ceiling fan is an example of:
A ceiling fan rotates around its fixed axis. This is an example of rotational motion. Rotational motion is a type of circular motion where the object spins around a central point or axis.
Q36. The motion of a planet around the Sun is:
Planets move around the Sun in nearly circular orbits. This is an example of circular motion. This motion is also periodic because it repeats at regular intervals, giving us years.
Q37. The motion of a vibrating string is an example of:
A vibrating string moves back and forth rapidly. This to and fro motion is called oscillatory motion. Oscillatory motion is a type of periodic motion.
Q38. The length of a curved line can be measured using:
A thread is placed along the curved line, and then the thread is straightened and measured with a ruler. This is the most common method for measuring the length of a curved line. A flexible measuring tape can also be used.
Q39. The SI system of units was established to:
The SI system was established to provide a uniform and consistent system of measurement worldwide. It is now used in almost all countries for scientific and commercial purposes. This makes it easy to compare measurements from different places.
Q40. The ancient unit of length ‘foot’ was based on the length of a human foot. Today, the foot is:
Today, the foot is still used as a unit of length in some countries like the USA. However, it is defined as exactly 0.3048 metres to make it consistent. This means the foot is now a standard unit, not based on a person’s foot.
Q41. The word ‘metre’ is derived from the Greek word ‘metron’, which means:
The word ‘metre’ comes from the Greek word ‘metron’, which means ‘to measure’. This reflects the purpose of the metre as a unit of measurement. The Greeks used this term in their system of measurement.
Q42. A person sitting on a moving bus is at rest with respect to:
A person sitting on a moving bus is at rest with respect to the bus because their position relative to the bus does not change. However, with respect to the road, trees or ground, the person is in motion. This shows that rest and motion are relative.
Q43. The to and fro motion of a swing is an example of:
A swing moves back and forth in a regular pattern. This to and fro motion is called oscillatory motion. Oscillatory motion is a type of periodic motion.
Q44. The motion of a cricket ball after being hit is an example of:
A cricket ball hit by a bat follows a curved path through the air. This is called curvilinear motion. Curvilinear motion is the motion of an object along a curved path.
Q45. The ancient unit of length based on the distance from the elbow to the tip of the middle finger is called:
The cubit is an ancient unit of length based on the distance from the elbow to the tip of the middle finger. It was used by many ancient civilizations. However, it was not a standard unit.
Q46. The ancient unit of length based on the distance between the tip of the thumb and the tip of the little finger when stretched is called:
A handspan is the distance between the tip of the thumb and the tip of the little finger when the hand is fully stretched. It was used as a unit of measurement in ancient times.
Q47. The ancient unit of length based on the width of a finger is called:
Angula is an ancient unit of length based on the width of a finger. It was used in India for measuring small lengths. Since finger widths vary, it was not a standard unit.
Q48. The ancient unit of length based on the length of a human foot is called:
The foot was an ancient unit of length based on the length of a human foot. It was used by many ancient civilizations, including the Romans. Today, it is defined as exactly 0.3048 metres.
Q49. The ancient unit of length based on the width of a closed fist is called:
Muthi is an ancient unit of length based on the width of a closed fist. It was used in some parts of India. Like other non-standard units, it varied from person to person.
Q50. The motion of a wheel of a bicycle is an example of:
A wheel of a bicycle rotates around its axis. This is an example of rotational motion. Rotational motion is a type of circular motion where the object spins around a fixed point or axis.
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Q51. The motion of a leaf falling from a tree is an example of:
A leaf falling from a tree follows an unpredictable path, swaying from side to side. This is an example of random motion. Random motion does not follow a regular pattern or path.
Q52. The motion of a clock’s hour hand is an example of:
The hour hand of a clock moves in a circle around the centre of the clock. This is an example of circular motion. The motion is also periodic because it repeats every 12 hours.
Q53. The length of a curved line can be measured using:
The length of a curved line can be measured using a flexible measuring tape or a thread and ruler. Both methods are effective for measuring curves. A straight ruler cannot measure curved lines accurately.
Q54. The measurement of length is important for:
The measurement of length is important for buying and selling goods, construction and engineering, scientific experiments and many other activities. Accurate measurement is essential in daily life and in science.
Q55. The unit of length used in the ancient Indian system was:
In ancient India, units of length like angula (based on finger width) and muthi (based on fist width) were used. These were non-standard and varied from person to person. Later, the metre became the standard unit.
Q56. The motion of the Moon around the Earth is an example of:
The Moon moves around the Earth in a nearly circular path. This is an example of circular motion. The Moon’s motion is also periodic because it repeats every month.
Q57. The motion of a car taking a sharp turn is an example of:
A car taking a sharp turn follows a curved path. This is called curvilinear motion. Curvilinear motion is the motion of an object along a curved path.
Q58. 1 kilometre is equal to how many metres?
One kilometre is equal to 1000 metres. The kilometre is a larger unit of length used for measuring long distances. It is commonly used in road signs and maps.
Q59. 1 metre is equal to how many centimetres?
One metre is equal to 100 centimetres. The centimetre is a smaller unit of length used for measuring medium-sized objects. This relationship is based on the decimal system.
Q60. 1 centimetre is equal to how many millimetres?
One centimetre is equal to 10 millimetres. The millimetre is a very small unit of length used for precise measurements. This relationship is based on the decimal system.