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Chapter 1: MEASUREMENT  Q1. The SI standard of time is based on: AA. the daily rotation of the earth BB. the frequency of light emitted by Kr86 CC. the yearly revolution of the earth about the sun DD. a precision pendulum clock EE. none of these Ans: EE Q2. A nanosecond is: AA. 109 BB. 10−9s CC. 10−10 s DD. 10−10 s EE. 10−12 Ans: BB Q3. The SI standard of length is based on: AA. the distance from the north pole to the equator along a meridian passing through Paris BB. wavelength of light emitted by Hg198 CC. wavelength of light emitted by Kr86 DD. a precision meter stick in Paris EE. the speed of light Ans: EE Q4. In 1866, the U. S. Congress defined the U. S. yard as exactly 3600/3937 international meter. This was done primarily because: AA. length can be measured more accurately in meters than in yards BB. the meter is more stable than the yard CC. this definition relates the common U. S. length units to a more widely used system DD. there are more wavelengths in a yard than in a meter EE. the members of this Congress were exceptionally intelligent Ans: CC Q5. Which of the following is closest to a yard in length? AA. 0.01m BB. 0.1m CC. 1m DD. 100m EE. 1000m Ans: CC Q6. There is no SI base unit for area because: AA. an area has no thickness; hence no physical standard can be built BB. we live in a three (not a two) dimensional world CC. it is impossible to express square feet in terms of meters DD. area can be expressed in terms of square meters EE. area is not an important physical quantity Ans: DD Q7. The SI base unit for mass is: AA. gram BB. pound CC. kilogram DD. ounce EE. kilopound Ans: CC Q8. A gram is: AA. 10−6 kg BB. 10−3 kg CC. 1 kg DD. 103 kg EE. 106 kg Ans: BB Q9. Which of the following weighs about a pound? AA. 0.05 kg BB. 0.5 kg CC. 5 kg DD. 50 kg EE. 500 kg Ans: DD Q10. (5.0 × 104) × (3.0 × 106) = AA. 1.5 × 109 BB. 1.5 × 1010 CC. 1.5 × 1011 DD. 1.5 × 1012 EE. 1.5 × 1013 |
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