VIII. Find the answer for the following questions within the grid.
- 10-3 is one ……..milli
- SI Unit of time is ……..second
- Cross view of reading a measurement leads to……….[parallax]
- …….is the one what a clock reads. [time]
- …….is the amount of substance present in an object.[Mass]
- …….can be taken to get the final reading of the recordings of different students for a single measurement. [Average]
- …….is a fundamental quantity.[Length]
- …….shows the distance covered by an automobile. [Odometer]
- …….A tailor uses to take measurements to stitch the cloth.[Measuring Tape]
- Liquids are measured with this physical quantity…. [Volumes]
Answer briefly.
Q- Define measurement.
Measurement is finding out the size, length, or amount of something using standard units.
Q-Define mass.
Mass is how much stuff is in an object. It’s how heavy or light something is.
Q-The distance between two places is 43.65 km. Convert it into metre and cm.
43.65 km is 43,650 m and 4,365,000 cm.
Q-What are the rules to be followed to make accurate measurement with scale?
To make accurate measurements with a scale, keep the object parallel to the scale, start from ‘0’, and avoid parallax error by ensuring your eye is directly above the point of measurement.
Solve the following.
Q- The distance between your school and your house is 2250 m. Express this distance in kilometre.
ï‚·Â The distance between your school and your house is 2250 m. Express this distance in kilometre.
- Distance in kilometre = 2250 m / 1000 = 2.25 km
Q- While measuring the length of a sharpened pencil, reading of the scale at one end is 2.0 cm and at the other end is 12.1 cm. What is the length of the pencil?
ï‚·Â While measuring the length of a sharpened pencil, reading of the scale at one end is 2.0 cm and at the other end is 12.1 cm. What is the length of the pencil?
- Length of the pencil = 12.1 cm – 2.0 cm = 10.1 cm
Additional QA
Q: What is length and its standard unit?
A: Length is the distance between two points. Its standard unit is the metre (m).
Q: What are the smaller units used to measure length?
A: Smaller units used to measure length include millimetre (mm) and centimetre (cm).
Q: What is the SI unit for length?
A: The SI unit for length is the metre (m).
Q: How do scientists ensure uniformity in measurements?
A: Scientists ensure uniformity in measurements by adopting a common set of units known as the International System of Units (SI Units).
Q: What are some prefixes used for SI units?
A: Some prefixes used for SI units include kilo-, centi-, and milli-.
Q: What is mass and its SI unit?
A: Mass is the measure of the amount of matter in an object. Its SI unit is the kilogram (kg).
Q: How is weight different from mass?
A: Weight is the gravitational pull experienced by matter, whereas mass is the amount of matter in an object.
Q: How is weight affected by gravity?
A: Weight is directly proportional to mass and is affected by gravity. On the moon, where gravity is weaker, weight is less compared to Earth.
Q: What are some common units for measuring mass?
A: Common units for measuring mass include grams (g) and kilograms (kg), with larger weights measured in tonnes or metric tonnes.
Q: How is mass measured using a beam balance?
A: Mass is measured using a beam balance by comparing the mass of an object to that of a known standard mass.
Q: What is time and how is it measured?
A: Time is the measurement of change. It is measured using clocks, with electronic clocks and stopwatches providing precise measurements.
Q: What are some rough methods for measuring time?
A: Rough methods for measuring time include using a clock face, counting pulses, and observing changes in day and night.
