___________ is a mammal who fly?

A. Ostrich
B. Bat
C. Peacock
D. None of these

Which of the following is the lightest substance?

A. Uranium
B. Hydrogen
C. Oxygen
D. Nitrogen

For glavinizing of iron which of the following metals is used ?

A. Aluminimum
B. Copper
C. Zinc
D. Lead

Highly intelligent Mammals are_________?

A. Rat
B. Dolphin
C. Bat
D. Elephant

Urea as a fertilizer contains:____________?

A. 57% n
B. 73% n
C. 46% n
D. 53% n

When sugar is added to water, its boiling point:__________?

A. Increase
B. Decrease
C. Remain unchanged
D. None of the above

The Bond Energy of H-F is________?

A. 456kj/mol
B. 562kj/mol
C. 281kj/mol
D. None

Which group of animals has heterogametic females?

A. Domestic fowl
B. Earthworm
C. Rabbit
D. None

Mostly elements have fractional atomic masses because of______________________?

A. Mass of an atom itself is in fraction
B. Atomic masses are average masses of isobars
C. Atmoic masses are average masses of isotopes proportional to their relative abundance
D. Atmoic masses are average masses of isotopes

Benzene gives mainly_________?

A. Addition reaction
B. Substitution reactions
C. Halogenation
D. All of these