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02. Physical Quantities And Measurement 1

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Answer in one line

Prepared by: learnloophq@gmail.com
Last edited 26 days ago by Learn LoopHQ.

Chapter: 02. Physical Quantities And Measurement 1

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Answer in one line
What is the purpose of measurement in daily life?
Measurement helps us determine quantities like distance, amount of goods, or liquid volume needed for various day-to-day activities.
Why did people in earlier times stop using body parts for measurement?
People stopped using body parts for measurement because their lengths varied from person to person, leading to inconsistent and different results.
Name the SI unit for time.
The SI unit for time is the second.
When measuring width, height, or depth, what physical quantity are you essentially measuring?
When measuring width, height, or depth, you are essentially measuring length.
What are submultiples of the metre?
Submultiples of the metre are centimetre (cm) and millimetre (mm).
How many millimetres are there in 1 centimetre?
There are 10 millimetres in 1 centimetre.
What is the approximate equivalent of 1 inch in centimetres?
One inch is approximately equal to 2.54 centimetres.
Why is it important to place the ruler as close as possible to the object being measured?
It is important to place the ruler as close as possible to the object to ensure the measurement is accurate and to minimize errors.
What is the scientific term for the quantity of matter contained in a body?
The scientific term for the quantity of matter contained in a body is mass.
Can a person be without mass if there is no gravity?
No, a person cannot be without mass even if there is no gravity, as mass is the quantity of matter in the body, while weight is dependent on gravity.
What are grams and milligrams used to measure?
Grams and milligrams are used to measure the mass of lighter bodies.
What does the ‘Tare’ button on an electronic balance do?
The ‘Tare’ button on an electronic balance sets the balance to weigh anything placed into the container but does not weigh the container itself, effectively zeroing out the container’s mass.
Why should chemicals not be placed directly on the balance pan?
Chemicals should not be placed directly on the balance pan because they can react with the pan material and cause corrosion.
What are the two types of adulteration that occur due to human action (intentional or accidental)?
The two types of adulteration that occur due to human action are intentional adulteration and metallic adulteration.
How do you find the approximate area of a regular shape using a graph paper regarding incomplete squares?
To find the approximate area of a regular shape using graph paper, you count incomplete squares that are more than half covered by the outline and ignore those that are less than half.
What is the significance of the lead seal on standard weights used by shopkeepers?
The lead seal on standard weights is a mark of approval from the Weights and Measures Department, ensuring the weight is correct and preventing dishonest practices.
What kinds of measurements (length or mass) are involved when buying fruits/vegetables and cloth?
Buying fruits/vegetables involves measuring mass, while buying cloth involves measuring length.
How many inches are in one foot?
There are 12 inches in one foot.
What is the relationship between 1 metre and centimetres?
1 metre is equal to 100 centimetres.
To convert millimetres (mm) into centimetres (cm), what mathematical operation should be performed?
To convert millimetres (mm) into centimetres (cm), the number of mm is divided by 10.
How do you convert kilometres (km) into metres (m)?
To convert kilometres (km) into metres (m), you multiply the number of km by 1000.
What is the main difference in size between a ruler and a metre scale?
A ruler is generally smaller than a metre scale, which is typically 1 metre long.
If the zero mark on a ruler is not visible, how should you measure the length of an object?
If the zero mark is not visible, you should start measuring from another clear mark (e.g., 1 cm) and then subtract that initial reading from the final reading at the other end of the object.
Why does a glass filled with milk feel lighter than a jug filled with milk?
A glass filled with milk feels lighter because the quantity of matter (milk) in it, and thus its mass, is less than that in a jug filled with milk.
What is the conversion factor between kilograms and grams?
The conversion factor between kilograms and grams is 1 kilogram = 1000 grams.
What is the conversion factor between grams and milligrams?
The conversion factor between grams and milligrams is 1 gram = 1000 milligrams.
What specific national standards are kept at the National Physical Laboratory in New Delhi?
The standard metre and standard kilogram are kept at the National Physical Laboratory in New Delhi.
Name two key components of a beam balance.
Two key components of a beam balance are the horizontal beam and the two identical pans.
When weighing potatoes on a beam balance, what indicates that the mass of the potatoes is equal to the standard weight?
When weighing potatoes on a beam balance, the beam becoming horizontal and the pointer aligning vertically indicates that the mass of the potatoes is equal to the standard weight.
What is the primary reason why food adulteration is done?
Food adulteration is primarily done to increase profits by increasing the quantity and sometimes enhancing the appearance or shelf life of the product.
Name one traditional unit used in India for measuring land.
One traditional unit for measuring land in India is Bigha (or Acre).
Name one traditional unit used in India for measuring gold.
One traditional unit for measuring gold in India is Tola (or Ratti).
Name one traditional unit used in India for measuring grains by volume.
One traditional unit for measuring grains by volume in India is Seer (or Maund).
Describe the setup for measuring the diameter of a ball using a ruler and two wooden blocks.
To measure the diameter of a ball, place it between two wooden blocks on a table such that the inner edges of the blocks are parallel and touch the ball, then use a ruler to measure the distance between the inner edges of the blocks.
According to the virtual tour video, name two body parts historically used for measuring things.
According to the virtual tour video, two body parts historically used for measuring things are the foot and the cubit.
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