Which of the following statement/sis/areincorrect?i. It is necessary to have standard units of measurement for the sake of uniformity in measurements. ii Every measurement consists of a number and a unit. iii. A thermometer isused to measure the height of a person. iv. The SI unit of measuring length is centimetre. * 1 point A. Only statement (i) is incorrect B. Only statement (iv) is incorrect C. Both statements (iii) and (iv) are incorrect D. Both statements (ii) and (iv) are incorrect
Answers
Answer:
iii. A thermometer is used to measure hight of a person
Explanation:
3rd points is incorrect, so the answer is 3rd point
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The incorrect statement is C. Both statements (iii) and (iv) are incorrect
i. It is necessary to have standard units of measurement for the sake of uniformity in measurements.
Standard units of measurement avoid ambiguity in measurements among various regions. Therefore, to maintain uniformity in measurement, standard system of measurement of units is developed called - SI system.
Thus, the given statement is correct.
ii Every measurement consists of a number and a unit.
The number in measurement denotes the magnitude of the measurement. And the unit represents the scale.
For example, measurement of 20 cm distance. Here, 20 is the magnitude and cm is unit.
Thus, this statement is also correct.
iii. A thermometer is used to measure the height of a person.
A thermometer is used to measure the temperature of a person, not height.
Height of a person can be measured by a measuring tape or ruler which has scale for length.
Hence, the above statement is incorrect.
iv. The SI unit of measuring length is centimetre.
The SI unit of measuring length is metre, and not centimetre. Centimetre is the CGS unit of length.
Hence, this statement is incorrect.
Thus, iii and iv statement are incorrect.