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Questions and Answers
What is the correct way to express 50 meters in unit notation?
When stating temperature in kelvin, which format is correct?
What does the symbol 'k' stand for in unit measurement?
Which of the following is an incorrect way to use unit symbols?
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What is the correct method for indicating a division of unit symbols?
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Which of the following statements about measuring dimensions is TRUE?
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Which expression correctly states the unit of measurement of energy per mole per kelvin?
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What is the proper way to express the mass of an object that weighs 5 kilograms?
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What is the mass equivalent of 1 atomic mass unit (amu) in terms of a carbon-12 atom?
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Which of the following correctly represents the length of a light year?
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What is the equivalent of 1 gigagram in kilograms?
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What is the SI unit of time?
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If 1 liter of water has a mass of 1 kg, what would the mass of 1 milliliter of water be?
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How many meters are in one astronomical unit (AU)?
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Which mass unit is equivalent to 1000 grams?
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What is the relationship between kilograms and quintals?
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What is the least count of a screw gauge if the total number of Head scale divisions is 100?
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What does the pitch of the screw gauge refer to?
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When is there no zero error in a screw gauge?
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What shape does the frame of a screw gauge typically have?
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How many divisions does the thimble of a screw gauge usually have?
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What is the main purpose of a screw gauge?
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What area is cut into the inner surface of the hollow cylinder of the screw gauge?
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What is measured using the head scale of a screw gauge?
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What is the full form of the SI system?
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How is the thickness of a rubber ball measured according to the Vernier caliper reading?
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What is the weight of an object that has a mass of 98 N?
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What is the significance of a light year in measurements?
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How is the thickness of a five rupee coin measured using a screw gauge?
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What is indicated by a negative zero error in a measuring instrument?
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How is the zero error calculated when the 95th division coincides with the pitch scale axis?
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What is the maximum mass that a common beam balance can accurately measure?
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What does the zero correction of +0.05 mm indicate?
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What is one advantage of using a physical balance compared to a common beam balance?
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What does the 12% of an egg's mass refer to?
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Which tool is primarily used to measure the thickness of small objects like a sheet of paper?
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Which of the following best describes the relationship between a blue whale's weight and that of an elephant?
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Study Notes
Units of Measurement
- Kilometre (km) is equal to 103 meters (m)
- Astronomical unit (AU) is equal to 1.496 × 1011 m
- A light year (ly) is equal to 9.46 × 1015 m
- A parsec (pc) is equal to 3.08 × 1016 m
- 1 gram (g) is equal to 1/1000 of a kilogram (kg)
- 1 milligram (mg) is equal to 1/1000000 of a kilogram (kg)
- 1 quintal is equal to 100 kg
- 1 metric tonne is equal to 1000 kg
- 1 amu (atomic mass unit) is defined as 1/12th of the mass of a C12 atom
- The mass of 1 ml of water is equal to 1g
- The mass of 1l of water is equal to 1kg
Time
- The SI unit of time is the second
- Time is measured in seconds, which can be used to express both very large and very small quantities.
Unit Prefixes
- The unit prefix "kilo" (k) is used for a factor of 103
- The unit prefix "mega" (M) is used for a factor of 106
- The unit prefix "giga" (G) is used for a factor of 109
- The unit prefix "tera" (T) is used for a factor of 1012
- The unit prefix "peta" (P) is used for a factor of 1015
- The unit prefix "deci" (d) is used for a factor of 10-1
- The unit prefix "centi" (c) is used for a factor of 10-2
- The unit prefix "milli" (m) is used for a factor of 10-3
Screw Gauge
- A screw gauge consists of a U-shaped metal frame with a hollow cylinder attached to one end.
- Grooves are cut on the inner surface of the cylinder through which a screw passes.
- The cylinder has a scale parallel to the axis of the screw, graduated in millimeters which is called the pitch scale (PS)
- One end of the screw is attached to a sleeve with a head called the thimble, which is divided into 100 divisions.
- The distance moved by the tip of the screw for a rotation of one division on the head scale is called the least count of the screw gauge.
Least Count of a Screw Gauge
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The formula to calculate the least count is:
Least count = (Value of one smallest pitch scale reading) / (Total number of Head scale division)
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For a typical screw gauge with a pitch of 1 mm and 100 divisions on the head scale, the least count is 0.01 mm.
Zero Error of a Screw Gauge
- In a perfect scenario, the zero of the head scale should coincide with the pitch scale axis when the fixed and movable studs are in contact. If this is not the case, there's a zero error.
- A negative zero error occurs when the zero of the head scale lies above the pitch scale axis.
Measuring Mass
- A common beam balance compares the mass of a sample with standard reference masses to measure mass accurately up to 5g.
- A physical balance is more sensitive than the beam balance and can measure mass correct to a milligram (mg).
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Description
Test your knowledge on various units of measurement in physics. This quiz covers measurements related to distance, mass, and time, including conversions between units and the significance of unit prefixes. Prepare to engage with concepts like kilometers, grams, and more!
