![]() How will you measure the least count of vernier caliper? It is the normal force exerted by the surface on the object against gravitational pull.Has magnitude and direction – vector quantity.It is the amount of matter contained in a body.The symbols of the units are not expressed in plural form.Ī Standard Unit is needed to maintain uniformity in measurements like length, weight, size and distance.No lull stop or other punctuation marks should be used within or at the end of symbols.Small letters are used as symbols for units not derived from a proper noun.N for newton, H for Henry, A for ampere, and W for watt. The symbols of the units named after scientists should be written by the initial capital letter.Į.g.The units named after scientists are not written with a capital initial letter.Write the rules that are followed in writing the symbols of units in SI system. No, I can not find the diameter of a thin wire of length 2 m using the ruler. It is measured by the ratio of distance travelled on the pitch scale to the number of rotations of the head scale.Ĭan you find the diameter of a thin wire of length 2 m using the ruler from your instrument box? Pitch of the screw gauge is the distance between two successive screw threads. What do you know about pitch of screw gauge? It is the distance moved by the tip of the screw for a rotation of one division on the head scale. Least count is the least measurement possible in a given device. system is the International System of Units. Unit is the quantity of a constant magnitude which is used to measure the magnitudes of other quantities of the same nature. Measurement is the process of comparison of the given physical quantity with the known standard quantity of the same nature. Reason (R) : The distance travelled by the light in one year is one light year.ĭistance between two celestial bodies is measured in terms of unit. (b) Both A and R are true and R is the correct reasonĪssertion (A) : Distance between two celestial bodies is measured in terms of light year. ![]() Reason (R) : To convert a temperature on the Celsius scale we have to add 273 to the given temperature. For our convenience we take it as 273K after rounding off the decimal. (a) Both A and R are true but R is not the correct reasonĪssertion (A) : 0° C = 273.16 K. Reason (R) : In everyday life, we use the term weight instead of mass. (b) Both A and R are true and R is the correct reason.Īssertion (A) : The scientifically correct expression is “The mass of the bag is 10 kg” (a) Both A and R are true but R is not the correct reason. With the help of vernier caliper we can have an accuracy of 0.1 mm and with screw gauge we can have an accuracy of 0.01 mm. One Celsius degree is an interval of IK and zero degree Celsius is 273.15 K.Ħ. A physical balance is more sensitive than a beam balance.ĥ. In everyday life, we use the term weight instead of mass.Ĥ. Kilometre is one of the SI units of measurement.ģ. The SI unit of electric current is kilogram.Ĭorrect statement: The SI unit of electric current is ampere.Ģ. A physical balance measures small differences in mass up to ………………. Radius of a thin wire is measured by …………………ĥ. Thickness of a cricket ball is measured by …………….Ĥ. Which among the following is not a device to measure mass?ģ. Rulers, measuring tapes and metre scales are used to measure
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