What is the difference between crystalline and an amorphous solid? A crystalline solid
A. has cubic structure while amorphous solid has a hexagonal structure B. has a regularly-repeating pattern while an amorphous solid has not C. is white while amorphous solid is yellow D. is always hard while amorphous solid is always soft E. melts on heating while an...Which of the following is not crystal?
A. Sodium chloride B. Lead C. Copper (II) tetraoxosulphate (VI) D. Glass E. Germanium Correct Answer: Option B – Lead
Viscosity in a liquid does not depend on the?
A. nature of the liquid B. relative velocity between the liquid layers C. area of the surfaces in contact D. temperature of the liquid E. normal reaction between the liquid layers Correct Answer: Option E – normal reaction between the liquid...
A metal is illuminated with a radiation of energy 6.88eV. If the kinetic energy of the emitted electrons is 1.5OeV; calculate the work function of the metal.
A. 0.22eV B. 4.59eV C. 5.38eV D. 8.38eV E. 10.32eV Correct Answer: Option C = 5.38eV Explanation Work function = Total energy – kinetic Energy = 6.88 – 1.50 = 5.38 ev
A radioactive substance has a half-life of 20 hours. What fraction of the original radioactive nuclei will remain after 80 hours?
A. 1/32 B. 1/16 C. 1/8 D. 1/4 E. 1/2 Correct Answer: Option B – 1/16 Explanation 1 → 1/2 → 1/4 → 1/8 → 1/16Products
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