Q.1:- In the blast furnace, Iron Oxide is reduced by ?
- Carbon
- Carbon Monoxide
- Silica
- Hot Blast Air
Q.2:- When metal is obtained in molten state from its ore, the process may be called ?
- Rusting
- Smelting
- Calcination
- Thermal Dissociation
Q.3:- Aluminium salt commonly used to stop bleeding is ? [SSC Exam 2015]
- Aluminium Chloride
- Aluminium Nitrate
- Aluminium Sulphate
- Potash Alum
Q.4:- Annealing process is ?
- Heating the steel bright red and then cooling slowly
- Heating the steel to a temperature much below redness and cooling it slowly
- Beating rods of Iron embedded in charcoal powder
- Heating steel to bright red and cooling suddenly
Q.5:- Which one among the following is used in making gunpowder ? [NDA Exam 2015]
- Magnesium Sulphate
- Potassium Nitrate
- Sodium Stearate
- Calcium Sulphate
Q.6:- The name Hydrogen was proposed by ?
- Bohr
- Rutherford
- Lavoisier
- Cavendish
Q.7:- Electromagnetic wave coming out of the nucleus of a natural radioactive atom is ? [SSC Exam 2013]
- Alpha Ray
- Beta Ray
- Gamma Ray
- Microwave
Q.8:- Living in the atmosphere of CO is dangerous because it ?
- Reduces organic matter of tissues
- Dried up the blood
- Combined with O2 present inside the form CO2
- Combines with haemoglobin and makes it incapable of absorbing Oxygen
Q.9:- Which gas emitted by power stations causes acid rain ? [SSC Exam 2015]
- Helium
- Carbon Dioxide
- Nitrogen
- Sulphur Dioxide
Q.10:- Which one of the following gases has colour ? [SSC Exam 2015]
- Oxygen
- Chlorine
- Hydrogen
- Nitrogen
Q.11:- Which one of the following elements is allowed with Iron to produce steel which can resist high temperatures and also have high hardness and abrasion resistance ? [IAS Exam 1996]
- Aluminium
- Chromium
- Nickel
- Tungsten
Q.12:- The percentage of Nitrogen in Ammonium Sulphate is ? [SSC Exam 2013]
- 18%
- 21%
- 25%
- 5%
Q.13:- Which one of the following statements about PYROLYSIS, which is a process for solid waste treatment is incorrect ? [SSC Exam 2013]
- The process occurs under high pressure at temperature above 430 deg. C.
- It is a thermochemical decomposition of organic waste
- It converts the waste into solid, liquid and gas of which the resultant liquid and gas can be used to produce energy
- The process occurs at a temperature above 430 deg. C at atmospheric pressure
Q.14:- Which of the following is used as new material for the manufacture of Rayon ? [SSC Exam 2015]
- Coal
- Petroleum
- Cellulose
- Plastic
Q.15:- An example of Heterocyclic compound is ? [SSC Exam 2013]
- Benzene
- Anthracene
- Naphthalene
- Furan
Q.16:- Which one of the following is the correct sequence in increasing order of molecular weight of the Hydrocarbon ? [IAS Exam 2001]
- Methane, Ethane, Propane and Butane
- Propane, Butane, Ethane, and Methane
- Butane, Ethane, Propane and Methane
- Butane, Propane, Ethane and Methane
Q.17:- Most of the explosions in mines occur due to the mixing of ? [IAS Exam 2000]
- Hydrogen with Oxygen
- Oxygen with Acetylene
- Methane with Air
- Carbon Dioxide with Ethane
Q.18:- Which one of the following has the highest fuel value ? [IAS Exam 1997]
- Hydrogen
- Charcoal
- Natural Gas
- Gasoline
Q.19:- Example of covalent bond is ? [RRB Allahabad Exam 2005]
- KCl
- BaO
- CHCl3
- CaH2
Q.20:- Which one of the following has largest size ? [MP PMT Exam 1998]
- C4
- N-3
- O-2
- F–
Q.21:- Ideal solution is formed when its components ?
- Have zero heat of mixing only
- Have zero volume change on mixing only
- Have zero heat of mixing and zero volume change
- Can be converted into gases
Q.22:- The decomposition of H2O2 is retarded by phosphoric acid. Thus phosphoric acid acts as ?
- Negative Catalyst
- Positive Catalyst
- Induced Catalyst
- Auto Catalyst
Q.23:- Chemical formula of common salt is ? [JSS Exam 2015]
- H2O
- NaCl
- KCl
- HCl
Q.24:- Which one of the following is known as Salt Peter ? [CDS Exam 2005]
- NaCl
- KNO3
- Na2CO3
- NaHCO3
Q.25:- The inert gas used as Beacon light is ? [SSC (CGL) Exam 2014]
- Kr
- Ar
- He
- Ne
