A. luminous zone
B. dark zone
C. blue zone
D. non-luminous zone
✅ The correct answer is option D.
Chemistry MCQs
The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?
A. 01-Jun
B. 01-Mar
C. 01-Aug
D. 01-Apr
✅ The correct answer is option C.
The maximum number of isomers for an alkene with molecular formula C4H8 is
A. 5
B. 4
C. 2
D. 3
✅ The correct answer is option B.
The formula C6H5-CO-CH3 represents
A. Acetone
B. Acetic acid
C. Acetophenone
D. Phenyl acetate
✅ The correct answer is option C.
The material which can be deformed permanently by heat and pressure is called a
A. thermoplastic
B. thermoset
C. chemical compound
D. polymer
✅ The correct answer is option B.
The most extensive, commercially useful source of thorium as monazite sand occurs in India at
A. Orissa coast
B. Travancore coast
C. West Bengal coast
D. Gujarat coast
✅ The correct answer is option B.
The most abundant rare gas in the atmosphere is
A. He
B. Ne
C. Ar
D. Xe
✅ The correct answer is option C.
The mass number of an atom is equal to
A. the number of protons
B. the number of protons and electrons
C. the number of nucleons
D. the number of neutrons
✅ The correct answer is option C.
The molecule which has the highest percentage of ionic character among the following is
A. HI
B. HF
C. HCI
D. HBr
✅ The correct answer is option B.
The inexpensive and commonly used variety of glass is called soda glass. It is called so because
A. was used initially for making bottles of soda(carbonated drink)
B. is made using soda(sodium carbonate)
C. was initially used for storing sodium carbonate
D. is made using soda lime
✅ The correct answer is option B.