CBSE Class 11 Chemistry Quiz | CBSE Class 11 Chemistry Objective Type Questions & Answers

Questions
21 When quick lime is added to water
A Heat is liberated
B Temperature decreases
C Heat is absorbed
D No heat change takes place

Answer: Heat is liberated
22 The iron layered with zinc is called
A Galvanised iron
B Steel
C Pig iron
D Cost iron

Answer: Galvanised iron
23 Which one of the following is the softest?
A Lithium
B Aluminium
C Iron
D Calcium

Answer: Iron
24 What is a mixture of potassium nitrate , powdered charcoal and sulphur called?
A Gun Powder
B Paint
C Glass
D Cement

Answer: Gun Powder
25 Which substance is used to retard the setting action of cement?
A CaSO.2HO
B NaO + KO
C AlO
D CaO

Answer: CaSO.2HO
26 For Which one of the following is the density maximum ?
A Water
B Ice
C Chloroform
D Benzene

Answer: Water
27 Which one of the following glasses is used in bullet proof screens?
A Reinforced glass
B Jena glass
C Pyrex glasss
D Soda glass

Answer: Reinforced glass
28 Which one of the following is used as a mordant in dyeing and tanning indusrty?
A magnesium sulphate
B magnesium chloride
C Magnesium oxide
D magnesium carbonate

Answer: magnesium sulphate
29 Which one of the following substances is made up of only one type of atoms?
A hydrogen
B air
C water
D milk

Answer: hydrogen
30 Talc contains which one of the following ?
A magnesium,silicon,oxygen
B zinc,tin,sulphur
C calcium,oxygen,tin
D zinc,calcium,oxygen

Answer: magnesium,silicon,oxygen
31 Acid rain contains high levels of
A sulphuric and nitric acids
B carbolic acid
C acetic acid
D oxalic acid

Answer: carbolic acid
32 What are Rubies and Sapphires chemically known as
A aluminium oxide
B boron nitride
C silicon dioxide
D lead tetra oxide

Answer: aluminium oxide
33 Curd is sour due to presence of
A Lactic acid
B Oxalic acid
C Acidic acid
D Tartaric acid

Answer: Lactic acid
34 Which of the following is a super cooled liquid?
A Glass
B Ice cream
C Teflon
D Mercury

Answer: Glass
35 Bronze is an alloy of
A Copper and tin
B Copper and zinc
C Tin and zinc
D Iron and zinc

Answer: Copper and tin
36 Which one of the following elements is not present in stainless steel?
A Tungsten
B Nickel
C Iron
D Chromium

Answer: Tungsten
37 Which alloy contains nickel?
A Solder
B Invar
C Brass
D Bronze

Answer: Invar
38 Which one of the following polymeric matreials is used for making bullet proof jacket?
A KEVLAR
B DACRON
C NYLON 6.6
D None

Answer: KEVLAR
39 Which one of the following is used as a filter in rubber tyres?
A Coke
B Carbon black
C Graphite
D Coal

Answer: Carbon black
40 Glass is made of the mixture of
A Sand and silicates
B Sand and salt
C Quartz and mica
D None of these

Answer: Sand and silicates
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