Diamond is harder than Graphite because of___________?

A. Difference in crystalline Structure
B. Tetrahedral structure of diamond
C. Difference in layer of atoms
D. None of these

Submitted by: Malik Asghar Hussain

Carbon,Diamond and Graphite are together called:___________?
A. Allotrope B. Isomers C. Isomorphs D. Isotopes Submitted by: Fahad Mehsud...
Diamond is an allotropic form of_______?
A. Carbon B. Hydrogen C. Nitrogen D. Silicon...
Diamond is a very expensive ornament. It is composed of a single element ___________?
A. Carbon B. Gold C. Silver D. Platinum E. None of these...
The luster of diamond is due to_________?
A. Reflection B. Total internal reflection C. Refraction D. None of these Submitted by: Afzal Chaudhry...
Black gold is an oil; Black diamond is_________?
A. Copper B. Iron C. Coal D. Wood Submitted by: Mansoor Ahmed Suhag...
UV light falls in the category of___________?
A. Ionizing Radiations B. Non Ionizing Radiation C. Visible light D. None...
Disease beri beri is because of___________?
A. Lack of green vegetables in diet B. Use of milled rice C. Deficiency of calcium in bones D. Poor use of citrus fruits Submitted by: Irum perveen...
Mach number is used in connection with the speed of___________?
A. Ship B. Light C. Sound D. aircraft Submitted by: Fahad Mehsud...
Permanent hardness of water may be removed by the addition of___________?
A. Sodium Carbonate B. Alum C. Potassium Permanganate D. Lime Submitted by: Warraich...
SONAR is based on the principle of___________?
A. Echo B. reverberation C. resonance D. None of these Submitted by: Abid Otho...