Prepare for the OSSC Excise SI exam with our comprehensive collection of the top 30 General Science multiple-choice questions (MCQs). Covering a wide range of scientific topics, these questions are meticulously crafted to test your understanding of fundamental scientific principles. From biology to physics, chemistry to environmental science, our MCQs provide a holistic review of the key concepts essential for excelling in the exam. Master the basics, sharpen your problem-solving skills, and boost your confidence with our carefully curated set of questions designed to help you ace the OSSC Excise SI exam.
Top 30 General Science MCQs For OSSC Excise SI
- What is the largest phylum of the animal kingdom, constituting around 2/3rd of all named species on Earth?
[A] Mollusca
[B] Chordata
[C] Arthropoda
[D] Annelida
Correct Answer: [C] Arthropoda - Which phylum includes organisms such as ants, mosquitoes, flies, cockroaches, shrimp, crabs, spiders, and scorpions?
[A] Mollusca
[B] Chordata
[C] Arthropoda
[D] AnnelidaCorrect Answer: [C] Arthropoda - Leishmaniasis is a disease caused by protozoan parasites transmitted by the bite of certain species of which insect?
[A] Mosquito
[B] Sand fly
[C] Bee
[D] None of the above
Correct Answer: [B] Sand fly - Which constituents are found in polysaccharides, proteins, and nucleic acids, respectively?
[A] Sugar, Fats, Nucleotides
[B] Carbohydrates, Proteins, Fats
[C] Sugar, Amino Acids, Nucleotides
[D] None of the aboveCorrect Answer: [C] Sugar, Amino Acids, Nucleotides - Which organisms are called scavengers of ecosystems?
[A] Bacteria
[B] Fungi & Bacteria
[C] Algae, Fungi & Bacteria
[D] None of the above
Correct Answer: [B] Fungi & Bacteria - What is the process by which fungi and bacteria break down dead organic material in ecosystems?
[A] Photosynthesis
[B] Decomposition
[C] Fermentation
[D] Transpiration
Correct Answer: [B] Decomposition - What is the main role of scavengers in ecosystems?
[A] Produce oxygen
[B] Decompose dead organic material
[C] Produce energy through photosynthesis
[D] Fix nitrogen
Correct Answer: [B] Decompose dead organic material - Which class of organisms includes mosquitoes, cockroaches, ants, flies, bees, moths, grasshoppers, beetles, and butterflies?
[A] Insects
[B] Crustaceans
[C] Arachnids
[D] None of the above
Correct Answer: [A] Insects - What are the main constituents of nucleic acids?
[A] Sugar, Amino Acids, Nucleotides
[B] Polysaccharides, Proteins, Nucleic Acids
[C] Nucleotides, Proteins, Polysaccharides
[D] None of the above
Correct Answer: [A] Sugar, Amino Acids, Nucleotides - Which organisms are responsible for breaking down the bodies of dead animals in ecosystems?
[A] Carnivores
[B] Herbivores
[C] Scavengers
[D] Omnivores
Correct Answer: [C] Scavengers - What is the name of the disease caused by protozoan parasites transmitted by sandflies?
[A] Malaria
[B] Leishmaniasis
[C] Dengue
[D] Chikungunya
Correct Answer: [B] Leishmaniasis - Which class of organisms includes crabs, lobsters, shrimp, and barnacles?
[A] Insects
[B] Crustaceans
[C] Arachnids
[D] None of the above
Correct Answer: [B] Crustaceans - What phenomenon occurs when two mercury drops are brought into contact?
[A] Formation of maximum volume
[B] Formation of maximum surface area
[C] Formation of a single bigger drop with minimum surface area
[D] Formation of multiple smaller drops
Correct Answer: [C] Formation of a single bigger drop with minimum surface area - What defines gravitational mass?
[A] Ratio of weight of a body and acceleration due to gravity
[B] Ratio of acceleration due to gravity and weight of a body
[C] Matter contained in a body
[D] None of the above
Correct Answer: [A] Ratio of weight of a body and acceleration due to gravity - What property of mercury causes two drops to merge into a single drop with minimum surface area?
[A] High density
[B] Low viscosity
[C] High surface tension
[D] Low volatility
Correct Answer: [C] High surface tension - What is the measure of a liquid’s elasticity due to cohesive forces between its molecules?
[A] Density
[B] Viscosity
[C] Surface tension
[D] Volatility
Correct Answer: [C] Surface tension - What is the gravitational mass of a body?
[A] The mass of the body measured by its gravitational attraction for other bodies
[B] The mass of the body measured by its weight
[C] The ratio of weight of a body and its volume
[D] The ratio of weight of a body and its density
Correct Answer: [A] The mass of the body measured by its gravitational attraction for other bodies - What is the term for waves that are also known as compression-dilation waves or longitudinal waves?
[A] Primary waves
[B] Secondary waves
[C] Love waves
[D] Rayleigh waves
Correct Answer: [A] Primary waves - What is a displacement reaction primarily used for in thermite welding?
[A] Extraction of metals
[B] Acid indigestion
[C] Steel making
[D] Joining metals, specifically aluminium and iron
Correct Answer: [D] Joining metals, specifically aluminium and iron - In a displacement reaction, what is displaced from its compound by another atom or a set of atoms?
[A] Electrons
[B] Protons
[C] Atoms
[D] Neutrons
Correct Answer: [C] Atoms - Which type of displacement reaction involves the replacement of one metal by another in a compound?
[A] Single displacement reaction
[B] Double displacement reaction
[C] Triple displacement reaction
[D] Multi displacement reaction
Correct Answer: [A] Single displacement reaction - What is the product when iron is added to a copper sulphate solution in a displacement reaction?
[A] Iron sulphate and copper
[B] Iron sulphate and copper sulphate
[C] Copper and iron sulphide
[D] Copper and iron
Correct Answer: [C] Copper and iron sulphide - In which application is displacement reaction used for extracting metals from their compounds?
[A] Thermite welding
[B] Acid indigestion
[C] Flame photometry
[D] Metal extraction
Correct Answer: [D] Metal extraction - What type of waves are Love waves and Rayleigh waves?
[A] Primary waves
[B] Secondary waves
[C] Surface waves
[D] Tertiary waves
Correct Answer: [C] Surface waves - Which type of displacement reaction involves the exchange of ions between two compounds to form two new compounds?
[A] Single displacement reaction
[B] Double displacement reaction
[C] Triple displacement reaction
[D] Multi displacement reaction
Correct Answer: [B] Double displacement reaction - In steel making, what displaces iron from its oxide?
[A] Carbon
[B] Aluminium
[C] Hydrogen
[D] Oxygen
Correct Answer: [A] Carbon - What is the primary characteristic of primary waves?
[A] They travel the slowest among seismic waves.
[B] They can only pass through solids.
[C] They cause the most damage during earthquakes.
[D] They can pass through solids, liquids, and gases.
Correct Answer: [D] They can pass through solids, liquids, and gases. - Which mineral present in bananas makes them slightly radioactive?
[A] Sodium
[B] Calcium
[C] Magnesium
[D] Potassium
Correct Answer: [D] Potassium - What is the chemical formula for acetic acid?
[A] CH3COOH
[B] Al(OH)3
[C] C3H6O
[D] CH3COO-
Correct Answer: [A] CH3COOH - What is the chemical formula for aluminium bromide?
[A] Al(OH)3
[B] C6H9AlO6
[C] AlBr3
[D] Al2(CO3)3
Correct Answer: [C] AlBr3
