The metallic sound produced by engine due to the pre-ignition of fuel is called _______________?

Related Mcqs:

1. Coal is produced after a long time decay of_________________?

   A. animals
   B. fossils
   C. wood
   D. all of the above

2. Crude oil is blackish coloured liquid produced after the decay of organic matter present between_________________?

   A. earth layer
   B. mountains
   C. sedimentary rocks
   D. rocks

3. Which is not heterocyclic compound _______________?

   A. Furan
   B. Thiophene
   C. Aniline
   D. Pyridine

4. Compounds having same molecular formula but differ in structural formula are called __________________?

   A. polymer
   B. monomer
   C. isomer
   D. allotropes

5. The property of carbon chain formation is called _________________?

   A. catenation
   B. hybridization
   C. polymerization
   D. solvation

6. The organic compounds having very high molecular weight are called _________________?

   A. carboxylic acids
   B. ketones
   C. aldehydes
   D. polymers

7. According to vital force theory_______________?

   A. Oorganic compounds can be synthesized from inorganic compounds
   B. organic compounds cannot be synthesized from inorganic compounds
   C. organic compounds can be synthesized by animals
   D. organic compounds can be synthesized by plants

8. The general formula of cycloalkene is __________________?

   A. CnH2n
   B. CnH2n+2
   C. CnH2n-1
   D. CnH2n-2

9. At low temperature and pressure cracking can be done in presence of catalyst________________?

   A. Al2O3
   B. Fe2O3
   C. Al2O3 and SiO2
   D. Fe2O3 and SiO2

10. In cyano group the carbon atom shows which kind of hybridization___________________?

    A. sp2
    B. sp
    C. sp3
    D. none of the above