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-10 General Science Previous Year Questions
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1.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
2.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
3. Who had role in the discovery of the atom bomb?
1. Madam Curie
2. Pierre Curie
3. Otto Hahn
4. Albert Einstein
Ans:4
4.A substance which readily forms colloidal solution in contact with water is called –
1. Extrinsic colloid
2. Associated colloid
3. Hydrophobic colloid
4. Hydrophilic colloid
Ans:4
5.Radioactive disintegration of uranium ultimately results in formation of –
1. Radium
2. Thorium
3. Polonium
4. Lead
Ans:4
6.Which of the following metals has least melting point?
1. Gold
2. Silver
3. Mercury
4. Copper
Ans:3
7.The nuclear force is –
1. short range repulsive force
2. short range attractive force
3. long range repulsive force
4. long range attractive force
Ans:2
8.The purest form of iron is –
1. Cast iron
2. Steel
3. Pig iron
4. Wrought iron
Ans:4
9.Now-a-days yellow lamps are frequently used as street lights. Which of the following gases is used in these lamps?
1. Sodium
2. Neon
3. Hydrogen
4. Nitrogen
Ans:1
10.Burning pyrites ore gives out –
1. Carbon dioxide gas
2. Sulphur dioxide gas
3. Nitrogen dioxide gas
4. Nitric oxide gas
Ans:2
11.A balloon filled with helium rises in air because –
1. air exerts an upward force on the balloon
2. the balloon is weightless
3. helium is less dense than air
4. helium pushes down on the air below the balloon
Ans:3
12.German silver, an alloy, does not contain the metal –
1. Nickel
2. Zinc
3. Copper
4. Silver
Ans:4
13.When water itself combines chemically with some element or mineral it is called –
1. Carbonation
2. Desalination
3. Hydration
4. Oxidation
Ans:3
14.Ozone consists of –
1. oxygen only
2. oxygen and nitrogen
3. hydrogen and carbon
4. oxygen and carbon
Ans:1
15.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
16.Which one of the following is known as the ‘brown coal’?
1. Anthracite
2. Bituminous
3. Coke
4. Lignite
Ans:4
17.The main constituent of biogas is –
1. oxygen
2. methane
3. acetic acid
4. methyl alcohol
Ans:2
18.The pH of human blood is between –
1. 6.5–7
2. 7.35–7.45
3. 8–9
4. 4.5–5
Ans:2
19.Sour taste of ‘Coca Cola’ is due to the presence of –
1. Acetic acid
2. Phosphoric acid
3. Hydrochloric acid
4. Formic acid
Ans:2
20.CaC2 on treatment with water gives –
1. Methane
2. Ethane
3. Ethylene
4. Acetylene
Ans:4
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