Related Questions

In a city 40% of the people have black hair, 25% have black eyes and 10% have both black hair and black eyes. What percentage of the people in the city has neither black hair nor black eyes?
A 35
B 40
C 45
D 50
In a certain city 40% of the people have black hair, 25% have black eyes and 10% have both black hair and black eyes. What percentage of the people in the city have neither black hair nor black eyes?
A 35
B 40
C 45
D 50
__________ of rubber decreases after its vulcanisation.
A Resistance to the action of organic solvent
B Tackiness
C Maximum service temperature
D Tensile strength
Vulcanisation of rubber does not increase its
A Elasticity
B Plasticity
C Ductility
D None of these
Most commonly used rubber vulcanisation agent is
A Sulphur
B Bromine
C Platinum
D Alumina
Which one of the following statements is not correct? Vulcanisation of rubber makes it
A Soft and flexible
B Strong and hard
C Chemical resistant
D Withstand higher temperatures
In vulcanisation process, rubber can be hardened by adding
A Nitrogen
B Silicon
C Sulphur
D Alcohol
Vulcanisation of rubber
A Decreases its tensile strength
B Increases its ozone & oxygen reactivity
C Increases its oil & solvent resistance
D Converts its plasticity into elasticity
Vulcanisation of raw rubber makes it
A Soft
B Less elastic
C Plastic
D Tacky
If 2 kg of metal, of which 1/3 is zinc and the rest is copper s, be mixed with 3 kg of metal , of which 1/4 is zinc and the rest is copper , then what will be the ratio of zinc to copper in the mixture?
A 13 : 42
B 19 : 43
C 15 : 42
D 17 : 43

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