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The SI standard of time is based on_____________?
A. the daily rotation of the earth
B. the frequency of light emitted by Kr86
C. the yearly revolution of the earth about the sun
D. a precision pendulum clock
E. none of these
During a total solar eclipse the rate of Photosynthesis___________?
C. Remain Constant
D. None of them
Water is a universal solvent for what reactions?
Which of the following is closest to a yard in length?
The SI base unit for mass is_____________?
The average speed of a moving object during a given interval of time is always:
A. the magnitude of its average velocity over the interval
B. the distance covered during the time interval divided by the time interval
C. one-half its speed at the end of the interval
D. its acceleration multiplied by the time interval
E. one-half its acceleration multiplied by the time interval
All of the following statements are incorrect except:
A. Precision and accuracy should go side by side in a scientific work
B. Scientific work must be precise, accuracy is not essential
C. Scientific work must be accurate, precision is not essential
D. Calculations must be made before any experiment
A. smallest indivisible particle in an element
B. smallest particle of an element which can undergo a chemical reaction
C. building block of an element
D. always smaller than molecule
A. Sea water
C. Tape water
Some substances are good conductors of electricity in both the solid and liquid states. These substances are generally______________?
A. ionic substances
B. metallic substances
C. molecular solids
D. covalent network solids
During a total solar eclipse the rate of Photosynthesis, The SI base unit for mass is?, Water is a universal solvent for what reactions?, The SI standard of time is based on_, During a total solar eclipse the rate of Photosynthesis