Dear Aspirants,
We are providing the most important General Science Previous year Questions for RRB NTPC 2019, RRB Group D 2019, SSC 2019 and all other competitive exams. These questions have very high chances to be asked in RRB NTPC 2019, RRB Group D 2019.
Set-25 General Science Previous Year Questions
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1.Concentration of water vapour in troposphere is –
1. 04%
2. 10-14%
3. 20-24%
4. 30-34%
Ans:1
2. First country to impose carbon tax is ________.
1. Australia
2. Iceland
3. USA
4. New Zealand
Ans:4
3.In the following reaction, fill in the blank.
Acid + Base → _______ + Water
1. Carbon dioxide
2. Metal Oxide
3. Hydrogen Gas
4. Salt
Ans:4
4.Which of the following is a characteristic of an exothermic reaction?
1. Release of heat
2. Absorption of heat
3. Doesn’t involve any change in temperature
4. None of the option is correct
Ans:1
5. __________ acts as a shield absorbing ultraviolet radiation from the sun.
1. Troposphere
2. Stratosphere
3. Mesosphere
4. Ionosphere
Ans:2
6. ________ is made by mixing iron with carbon and metals like chromium, nickel and manganese.
1. Ship
2. Stainless Steel
3. Rust
4. Ozone
Ans:2
7. The salt concentration (measured as salinity in parts per thousand), is _______% in sea.
1. 10-20
2. 30-35
3. 40-50
4. 60-70
Ans:2
8.Fabric made from_________ does not get wrinkled easily.
1. Cotton
2. Flax
3. Silk
4. Polyester
Ans:4
9.What is formed when Carbon Dioxide is passed through Lime Water?
1. Copper Sulphate
2. Calcium Carbonate
3. Magnesium Oxide
4. Baking Soda
Ans:2
10.All isotopes of the same element have _________.
1. different atomic numbers and different atomic mass
2. different atomic numbers and the same atomic mass
3. the same atomic number but different atomic masses
4. the same atomic number and the atomic mass
Ans:3
11.Nitric acid does not react with –
1. Gold
2. Copper
3. Zinc
4. Iron
Ans:1
12.Which of the following gases is known as “Laughing Gas”?
1. Nitrous oxide
2. Nitrogen peroxide
3. Nitrogen
4. Nitric oxide
Ans:1
13.Name two elements that find wide application in transistor industry.
1. Silicon and Germanium
2. Carbon and Platinum
3. Iridium and Germanium
4. Tungsten and Platinum
Ans:1
14. Which one of the following is known as the ‘brown coal’?
1. Anthracite
2. Bituminous
3. Coke
4. Lignite
Ans:4
15. Hydrogen bomb is based on the principle of –
1. controlled fission reaction
2. uncontrolled fission reaction
3. controlled fusion reaction
4. uncontrolled fusion reaction
Ans:4
16.The technique of calculating the age of fossil organisms is –
1. Radiocarbon dating
2. Electroporation
3. Counting the annual rings
4. Micro Manipulation
Ans:1
17. Iodised salt is beneficial for –
1. Lowering of blood pressure
2. Prevention of dehydration
3. Thyroid function
4. Salivary glands
Ans:3
18. Submarines move under water. They have engines that run on –
1. Solar energy
2. Diesel
3. Batteries
4. Steam
Ans:2
19. The residue left after extracting juice from sugar beet and sugarcane is called –
1. Molasses
2. Bagasse
3. Whey
4. Biomass
Ans:2
20. Gasohol is a mixture of:
1. Gasoline and Butanol
2. Gasoline and Ethanol
3. Gasoline and Propanol
4. Methanol and Ethanol
Ans:2