General Science Mock Test – Free Online Practice

General Science ke liye free mock test: 775 questions, timer, negative marking aur explanation ke saath. Koi login nahi, koi payment nahi — turant shuru karein.

Is Test Me Kya Milta Hai?

General Science ke liye ye 775 questions ka practice set General Knowledge pattern par banaya gaya hai. Test me 45 second per question ka timer hai aur har galat answer par 0.25 marks kate jaate hain — bilkul asli exam jaisa. Submit karne ke baad aapko exact score, accuracy aur har question ka explanation milta hai. Bihar ke competitive exams (BPSC, BSSC, Bihar Police, BTSC) ki tayari karne wale students ke liye.

Practice Questions (30 of 775)

Neeche is set ke kuch questions hain — inhi par aapka timed test banega. Answer dekhne ke liye “Answer” par click karein.

1. Which polymer is used for making 'Bulletproof' vests and high-strength helmets?
   (A) Nylon

   (B) Kevlar

   (C) Teflon

   (D) Bakelite
   ✅ Answer & Explanation

   Sahi jawab: B) Kevlar

   Explanation: Kevlar is a heat-resistant and strong synthetic fiber; its molecular structure makes it 5 times stronger than steel.
2. What is the 'Monomer' of Polyvinyl Chloride (PVC), used for making water pipes in Bihar?
   (A) Ethene

   (B) Vinyl Chloride

   (C) Styrene

   (D) Propene
   ✅ Answer & Explanation

   Sahi jawab: B) Vinyl Chloride

   Explanation: PVC is made by the polymerization of Vinyl Chloride ($CH_2=CHCl$).
3. Which type of 'Plastic' can be melted and reshaped again and again?
   (A) Thermosetting plastic

   (B) Thermoplastic

   (C) Fiberglass

   (D) Bakelite
   ✅ Answer & Explanation

   Sahi jawab: B) Thermoplastic

   Explanation: Thermoplastics (like Polyethylene/PVC) soften on heating and harden on cooling.
4. What is the main difference between 'Soap' and 'Detergent' in hard water?
   (A) Soap is better

   (B) Detergent works in hard water, soap does not

   (C) Soap is synthetic

   (D) Detergents are made from fats
   ✅ Answer & Explanation

   Sahi jawab: B) Detergent works in hard water, soap does not

   Explanation: Soaps form 'scum' with Ca and Mg ions in hard water, whereas detergents remain soluble and effective.
5. Which polymer is used to make 'Non-stick' frying pans?
   (A) PVC

   (B) Polystyrene

   (C) Teflon (PTFE)

   (D) Nylon
   ✅ Answer & Explanation

   Sahi jawab: C) Teflon (PTFE)

   Explanation: Polytetrafluoroethylene has extremely low friction and high heat resistance.
6. What is 'Natural Rubber' chemically?
   (A) Polystyrene

   (B) Polyisoprene

   (C) Polyvinyl

   (D) Neoprene
   ✅ Answer & Explanation

   Sahi jawab: B) Polyisoprene

   Explanation: Natural rubber is a polymer of the monomer Isoprene ($2-methyl-1,3-butadiene$).
7. Which 'Thermosetting' plastic is used for making electrical switches and handles of pressure cookers?
   (A) Polyethylene

   (B) Bakelite

   (C) PVC

   (D) Nylon
   ✅ Answer & Explanation

   Sahi jawab: B) Bakelite

   Explanation: Bakelite is a poor conductor of heat and electricity and does not melt once set.
8. What is 'Terylene' (Dacron) a type of?
   (A) Polyamide

   (B) Polyester

   (C) Polyether

   (D) Polyolefin
   ✅ Answer & Explanation

   Sahi jawab: B) Polyester

   Explanation: Terylene is a popular polyester used for making clothing fibers.
9. Which gas is evolved during the manufacture of 'Polyurethane' foam used in mattresses?
   (A) Oxygen

   (B) Hydrogen

   (C) Carbon Dioxide

   (D) Chlorine
   ✅ Answer & Explanation

   Sahi jawab: C) Carbon Dioxide

   Explanation: CO2 acts as a blowing agent to create the 'bubbles' or foam structure.
10. What is the 'Monomer' of Teflon?
    (A) Vinyl Chloride

    (B) Tetrafluoroethene

    (C) Ethene

    (D) Ethylene Glycol
    ✅ Answer & Explanation

    Sahi jawab: B) Tetrafluoroethene

    Explanation: Tetrafluoroethene ($CF_2=CF_2$) polymerizes to form Teflon.
11. Which synthetic fiber was the first to be made entirely from 'Chemicals' (Coal, Air, and Water)?
    (A) Rayon

    (B) Nylon

    (C) Terylene

    (D) Acrylic
    ✅ Answer & Explanation

    Sahi jawab: B) Nylon

    Explanation: Nylon is a fully synthetic polyamide fiber developed in 1935.
12. What is 'Orlon' (Acrylic fiber) used as a substitute for?
    (A) Cotton

    (B) Silk

    (C) Wool

    (D) Linen
    ✅ Answer & Explanation

    Sahi jawab: C) Wool

    Explanation: Acrylic fibers are warm, lightweight, and soft, mimicking the properties of wool.
13. Which chemical is used as a 'Plasticizer' to make PVC flexible for wires?
    (A) Benzene

    (B) Phthalates

    (C) Sulfur

    (D) Acetic Acid
    ✅ Answer & Explanation

    Sahi jawab: B) Phthalates

    Explanation: Phthalates fit between polymer chains, allowing them to slide past each other.
14. What is 'Neoprene' primarily used for?
    (A) Making tires

    (B) Wetsuits and chemical-resistant gloves

    (C) Fuel

    (D) Clothing
    ✅ Answer & Explanation

    Sahi jawab: B) Wetsuits and chemical-resistant gloves

    Explanation: Neoprene is a synthetic rubber that is more resistant to oil and heat than natural rubber.
15. Which part of a 'Soap' molecule is attracted to water?
    (A) Hydrophobic tail

    (B) Hydrophilic head

    (C) Carbon chain

    (D) Glycerol
    ✅ Answer & Explanation

    Sahi jawab: B) Hydrophilic head

    Explanation: The ionic 'head' is water-loving, while the long hydrocarbon 'tail' is oil-loving.
16. What are 'Micelles' in the context of cleaning?
    (A) Small bacteria

    (B) Clusters of soap molecules surrounding dirt

    (C) Plastic particles

    (D) Fibers
    ✅ Answer & Explanation

    Sahi jawab: B) Clusters of soap molecules surrounding dirt

    Explanation: Micelles trap grease in the center, allowing it to be washed away with water.
17. Which 'Polyamide' is used for making toothbrush bristles?
    (A) Nylon 6,6

    (B) PVC

    (C) Polystyrene

    (D) Bakelite
    ✅ Answer & Explanation

    Sahi jawab: A) Nylon 6,6

    Explanation: Nylon's strength and elasticity make it perfect for bristles.
18. What is 'Melamine' used for in the kitchen?
    (A) Non-stick coating

    (B) Unbreakable crockery and plates

    (C) Cleaning agents

    (D) Fuel
    ✅ Answer & Explanation

    Sahi jawab: B) Unbreakable crockery and plates

    Explanation: Melamine-formaldehyde is a hard, fire-resistant plastic used for dinnerware.
19. Which substance is added to 'Detergents' to make them 'Whiter' (Optical brighteners)?
    (A) Bleach

    (B) Fluorescent dyes

    (C) Salt

    (D) Soda ash
    ✅ Answer & Explanation

    Sahi jawab: B) Fluorescent dyes

    Explanation: These dyes absorb UV light and re-emit blue light, making clothes look brighter.
20. What is 'Polyethylene' (Polythene) made from?
    (A) Methane

    (B) Ethene (Ethylene)

    (C) Ethane

    (D) Acetylene
    ✅ Answer & Explanation

    Sahi jawab: B) Ethene (Ethylene)

    Explanation: Ethene molecules join in long chains to form Polythene.
21. Which 'Natural Fiber' is a protein fiber obtained from silkworms?
    (A) Cotton

    (B) Silk

    (C) Rayon

    (D) Jute
    ✅ Answer & Explanation

    Sahi jawab: B) Silk

    Explanation: Silk is composed primarily of the protein Fibroin.
22. What is the 'Main Constituent' of Jute, a major crop of North Bihar?
    (A) Protein

    (B) Cellulose and Lignin

    (C) Starch

    (D) Fat
    ✅ Answer & Explanation

    Sahi jawab: B) Cellulose and Lignin

    Explanation: Jute is a lignocellulosic fiber, making it strong but biodegradable.
23. Which chemical is used to 'Degum' silk?
    (A) Acid

    (B) Soap or Alkali solution

    (C) Alcohol

    (D) Ether
    ✅ Answer & Explanation

    Sahi jawab: B) Soap or Alkali solution

    Explanation: The gum (Sericin) is removed by boiling in a soap solution to make the silk soft.
24. What is 'Buna-S' synthetic rubber?
    (A) Pure Polyisoprene

    (B) Copolymer of Butadiene and Styrene

    (C) Copolymer of Butadiene and Acrylonitrile

    (D) PVC rubber
    ✅ Answer & Explanation

    Sahi jawab: B) Copolymer of Butadiene and Styrene

    Explanation: Buna-S is widely used for making automobile tires.
25. Which 'Polysaccharide' is used to make Rayon?
    (A) Starch

    (B) Cellulose (Wood pulp)

    (C) Glycogen

    (D) Chitin
    ✅ Answer & Explanation

    Sahi jawab: B) Cellulose (Wood pulp)

    Explanation: Rayon is regenerated cellulose.
26. What is 'PMMA' (Lucite or Plexiglass) used for?
    (A) Making pipes

    (B) Substitute for glass in aircraft windows

    (C) Fuel

    (D) Fertilizer
    ✅ Answer & Explanation

    Sahi jawab: B) Substitute for glass in aircraft windows

    Explanation: It is a transparent thermoplastic that is lighter and more shatter-resistant than glass.
27. Which fiber is known as the 'Golden Fiber' of India?
    (A) Cotton

    (B) Silk

    (C) Jute

    (D) Wool
    ✅ Answer & Explanation

    Sahi jawab: C) Jute

    Explanation: Jute is called the golden fiber due to its color and high economic value.
28. What is 'Biodegradable' plastic?
    (A) Plastic that lasts forever

    (B) Plastic that can be broken down by bacteria

    (C) Recycled PVC

    (D) Teflon
    ✅ Answer & Explanation

    Sahi jawab: B) Plastic that can be broken down by bacteria

    Explanation: Examples include PLA (Polylactic acid) and PHB.
29. Which chemical is used to 'Mercerize' cotton to increase its strength and luster?
    (A) Hydrochloric Acid

    (B) Sodium Hydroxide (Caustic Soda)

    (C) Bleaching Powder

    (D) Sodium Carbonate
    ✅ Answer & Explanation

    Sahi jawab: B) Sodium Hydroxide (Caustic Soda)

    Explanation: Treatment with NaOH makes cotton fibers swell and become shinier.
30. What is 'Styrofoam' chemically?
    (A) Expanded Polystyrene

    (B) Polyethylene

    (C) Polyurethane

    (D) PVC
    ✅ Answer & Explanation

    Sahi jawab: A) Expanded Polystyrene

    Explanation: It is used for insulation and packaging material.

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