What Are The Precautions To Be Taken While Measuring?

What is the SI unit of time?

The second, symbol s, is the SI unit of time.

It is defined by taking the fixed numerical value of the caesium frequency Cs.

, the unperturbed ground-state hyperfine transition frequency of the caesium-133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s–1..

What is measurement in science for Class 6?

Measurement: Comparing an unknown quantity with some known quantity is called measurement. Result of Measurement: The result of measurement has two parts; one part is the number and another part is the unit. The known quantity which is used in measurement is called a unit.

Measurements continue to play an important role throughout everybody’s life, for example, during a medical check-up, a sports competition, when building a house, when controlling temperature in appliances, or while cooking.

What precautions should be taken while measuring the length of a pencil using a ruler?

the precautions are: the level of eye and level of scale mark should be perpendicular to each other.the zero of scale should coincide with starting point.it should be straight along the line.

Which instrument is used to measure distance?

List of measuring devicesInstrumentQuantity measurednephoscopeto measure the speed and direction of cloudsnephelometerparticle in a liquidodometerdistance travelledohmmeterelectrical resistance128 more rows

What are the two parts of measurement?

A measurement consists of two parts – the amount present or numeric measure, and the unit that the measurement represents within a standardized system.

What were some of the early units of measurement of distance?

The Egyptian cubit, the Indus Valley units of length referred to above and the Mesopotamian cubit were used in the 3rd millennium BC and are the earliest known units used by ancient peoples to measure length.

What is the SI unit of length?

The metre, symbol m, is the SI unit of length. It is defined by taking the fixed numerical value of the speed of light in vacuum c to be 299 792 458 when expressed in the unit m s–1, where the second is defined in terms of the caesium frequency Cs.

What is the need of measurement Class 6?

Ans: We need standard unit for measurement to make our judgement more reliable and accurate. For proper dealing, measurement should be same for everybody. Thus there should be uniformity in measurement. For the sake of uniformity we need a common set of units of measurement, which are called standard units.

What points should we follow while measuring the length of a straight object?

The following things should be kept in mind while measuring the length of any object: The object to be measured should be kept properly on the scale such that one of its end coincides with the zero (0) mark on the scale. The object to be measured should be kept parallel to the scale and touching it.

What precaution will you take to measure the length of the table top accurately?

You must take the following precautions while using various instruments for measuring length : The scale should be place along the length to be measured. Your eye must be in front of and in line where the measurement is to be taken. Ensure that the ends of the scale are not worn-out.

Why is the proper position of the eye required for taking reading of a scale?

Human eye can’t focus simultaneously on two points. To avoid parallax error , eye should be on the point of measurement to be taken.

What is the need for correct measurement?

⭐️ NEED OF CORRECT MEASUREMENT ? Ans : Establishment and verification of physical laws demand observations and measurements. Improper measurements are not considered accurate and hence are not accepted. The most common improper method of measurement is HANDSPAN.

What is definition of measurement?

Measurement is the numerical quantitation of the attributes of an object or event, which can be used to compare with other objects or events. … This system reduces all physical measurements to a mathematical combination of seven base units. The science of measurement is pursued in the field of metrology.

Which three precautions should be taken while measuring length?

The precautions to be taken while using a meter scale to measure lengths are as follows : (1) The scale should be placed to the side of the object being measured. It should also be in touch with the object being measured. (2) While reading the scale, eye must be placed vertically above the scale mark being read.