MCQ
upsc-p1-science-tech-measurement-units MCQ - Practice Questions with Answers
Solve 8 upsc-p1-science-tech-measurement-units questions for RAS/RPSC preparation.
Practice questions
Q1Match List I with List II and select the correct code: List I (Concept): A. Accuracy; B. Precision; C. Resolution; D. Uncertainty List II (Meaning): 1. Closeness of repeated readings to one another; 2. Smallest change an instrument can display; 3. Closeness to the true or accepted value; 4. Quantified range in which the true value is reasonably expected
Accuracy concerns closeness to the accepted value, precision concerns closeness among repeated readings, resolution is the smallest displayed change, and uncertainty is the quantified range reasonably expected to contain the true value. Hence A-3, B-1, C-2 and D-4.
Q2With reference to radiation measurement, consider the following statements: 1. Becquerel measures activity. 2. Gray measures absorbed dose. 3. Sievert reflects biological effect. Select the correct answer using the code given below.
All three statements are correct. Becquerel, gray and sievert describe activity, absorbed dose and biological effect respectively, so the three units are not interchangeable.
Q3Match List I with List II and select the correct code: List I (Quantity): A. Pressure; B. Power; C. Frequency; D. Energy List II (SI unit): 1. Joule; 2. Hertz; 3. Pascal; 4. Watt
Pressure is measured in pascal, power in watt, frequency in hertz and energy in joule. Thus the correct matching is A-3, B-4, C-2 and D-1.
Q4With reference to SI units, consider the following statements: 1. Mole and candela are base units. 2. Watt and hertz are derived units. 3. Kelvin is a derived unit. Select the correct answer using the code given below.
Mole, candela and kelvin are among the seven SI base units. Watt and hertz are derived units. Therefore, statements 1 and 2 are correct, while statement 3 is incorrect.
Q5Arrange the following components in the order shown by the SI and legal-metrology traceability chain, from the international foundation to the consumer-facing end: A. CSIR-NPL B. Verified instruments and consumer packages C. BIPM and SI constants D. Legal standards Select the correct sequence.
The traceability chain runs from BIPM and SI constants to CSIR-NPL, then to legal standards, and finally to verified instruments and consumer packages. The correct sequence is C-A-D-B.
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More questions
6Arrange the following SI prefixes in descending order of their multiplying factors: A. milli B. mega C. nano D. kilo Select the correct sequence.
7Consider the following statements about measurement errors: 1. Repeating observations and statistical averaging can reduce the effect of random error. 2. Repeating an experiment by itself removes a systematic error. 3. A vernier caliper that does not read zero when its jaws touch has a zero error. Select the correct answer using the code given below.
8Consider the following statements: 1. The mass of the same body remains unchanged when it is taken from Earth to the Moon. 2. Its weight changes because gravitational acceleration changes. Which one of the following is correct?