Table of Contents
SSC CGL 2024 Tier 1 Science MCQ [Chemistry]
- Which two organic chemists are known for observing the peroxide effect in adding reagents to unsaturated compounds in 1933?
A) Morris S Kharasch and Frank R Mayo
B) C John Cadogan and Luis M Campos
C) B Steven Bachrach and Roald Hoffmann
D) Justus von Liebig and Friedrich Wöhler - In which musical note did Newland put the metals Co and Ni with halogens?
A) Fa
B) Do
C) Re
D) Mi - An organic reaction used to convert an aryl diazonium salt into an aryl halide using a copper(I) halide catalyst is called:
A) Finkelstein reaction
B) Gattermann reaction
C) Sandmeyer reaction
D) Balz-Schiemann reaction - Which of the following has the highest salinity?
A) Great salt lake
B) Lake Van
C) Red sea
D) Dead sea - What is the IUPAC name of tertiarybutyl alcohol?
A) 2-Methylpropan-2-ol
B) 1-propylpropan-3-ol
C) 1-Methylpropan-3-ol
D) 1-ethylpropan-3-ol - Which of the following decomposition reactions is NOT a redox reaction?
A) Decomposition of dihydrogen monoxide
B) Decomposition of sodium hydride
C) Decomposition of potassium chlorate
D) Decomposition of calcium carbonate - Palladium on barium sulphate (Pd/BaSO₄) is also known as:
A) a Hillman reaction catalyst
B) a Cannizzaro reaction catalyst
C) the Rosenmund catalyst
D) an aldol reaction catalyst - The decomposition of gaseous Ammonia on a hot platinum surface is a _______________ order reaction at high pressure.
A) two
B) zero
C) three
D) one - The type of reaction that is typically found when a material that is required for the reaction to proceed, such as a surface or a catalyst, is saturated by the reactants is called a __________ order reaction.
A) first
B) second
C) zero
D) third - When haloalkanes and aryl and vinyl halides react with magnesium metal they yield which reagent?
A) Hinsberg reagent
B) Grignard reagent
C) Tollens’ reagent
D) Fehling reagent - Which of the following is a correct order of basicity?
A) LiOH>NaOH>KOH>CsOH
B) LiOH>KOH>CsOH>NaOH
C) KOH>CsOH>NaOH>LiOH
D) CsOH>KOH>NaOH>LiOH - Who developed the theory of combustion as a chemical reaction with oxygen in the 18th century, that excluded phlogiston theory?
A) Antoine Lavoisier
B) Robert Boyle
C) Friedrich Wöhler
D) Johann Becher - What is the salinity of the Dead Sea (per litre of water)?
A) 440 grams
B) 240 grams
C) 340 grams
D) 390 grams - When you take Lead nitrate powder in a boiling tube and heat it, you will observe the emission of brown fumes that are of _____________________.
A) Nitrous oxide
B) Nitric oxide
C) Nitrogen dioxide
D) Dinitrogen trioxide - As per Mendeleev’s prediction, atomic mass of eka-aluminium was:
A) 100
B) 44
C) 72
D) 68 - For a chemical reaction with rise in temperature by 10°, the rate constant becomes nearly ____________________.
A) Double
B) Triple
C) one-fourth
D) half - Grignard reagent is represented as:
A) CH₃-Ca-F
B) CH₃-Be-F
C) CH₃-Mg-Cl
D) H-Mg-H - What was Antoine-Laurent Lavoisier’s most important contribution to chemistry in 1789?
A) Law of Conservation of Mass
B) Law of Multiple Proportions
C) Law of Definite Proportions
D) Law of Conservation of Energy - Calculate the oxidation number of ‘S’ in H₂S₂O₇.
A) 3
B) 7
C) 6
D) 2 - Which of the following is the most acidic?
A) HCOOH
B) C₆H₅COOH
C) C₂H₅COOH
D) CH₃COOH - The chemical formulae of glucose is C6H12O6. The weight % of carbon in glucose is?
A) 40
B) 72
C) 53
D) 25
- Which allotrope of carbon was discovered by Robert F Curl, Harold W Kroto and Richard E Smalley in 1985?
A) Graphene
B) Lonsdaleite
C) Carbophene
D) Fullerene - To which group do the alkaline earth metals such as radium, barium and strontium belong?
A) Group 5A
B) Group 2A
C) Group 1A
D) Group 3A - According to Mendeleev’s Periodic Table, which elements’ properties matched up remarkably well with ekasilicon?
A) Gallium
B) Scandium
C) Titanium
D) Germanium - When electricity is passed through water, what kind of chemical reaction occurs?
A) Decomposition
B) Displacement
C) Double displacement
D) Combination - Which among the following is NOT a classification criterion of drugs?
A) Chemical structure
B) Molecular target
C) Behavioural condition
D) Pharmacological effect - Which of the following gases plays an important role in welding titanium, aluminium, stainless steel, and magnesium?
A) Fluorine
B) Neon
C) Argon
D) Chlorine - Which of the following is a straight-chain alkyl carboxylic acid with the chemical formula CH₃CH₂CH₂CO₂H?
A) Methanoic acid
B) Propionic acid
C) Ethanoic acid
D) Butyric acid - In Newlands’ Octaves, the properties of lithium and ________ were found to be the same.
A) Sodium
B) Aluminium
C) Magnesium
D) Beryllium - Which of the following is NOT a greenhouse gas?
A) Methane
B) Carbon dioxide
C) Nitrous oxide
D) Nitric oxide - Which polyatomic ionic compound is a white, crystalline powder used in fire extinguishers and to neutralise acids and bases?
A) Sodium Bisulphite
B) Sodium Thiosulphate
C) Sodium Chromate
D) Sodium Bicarbonate - Which of the following statements are true based on the 4NH₃(g) + 5O₂(g) → 4NO(g) + 6H₂O(g)?
A) (a) and (d)
B) (a) and (b)
C) (c) and (d)
D) (b) and (c) - Which of the following statements is INCORRECT regarding water remaining colder in an earthen pot (matka)?
A) Water gets evaporated at the surface of the earthen pot.
B) The earthen pot is porous.
C) Environmental water vapour enters the pot through pores.
D) The water oozes out through the pores in an earthen pot. - A chemical reaction in which the rate of reaction is directly proportional to the first power of the concentration of the reacting substance is called:
A) Zero order reaction
B) Third order reaction
C) Second order reaction
D) First order reaction - How many carbon dioxide and water molecules will be there in the product side, if the following equation is made balanced? C₂H₅OH + O₂ → CO₂ + H₂O
A) 3 and 6, respectively
B) 1 and 1, respectively
C) 2 and 3, respectively
D) 3 and 2, respectively - Name the straight chain alkane having chemical formula C₁₂H₂₆, which is used as a research chemical and in making biodegradable detergents.
A) Nonane
B) Dodecane
C) Nonadecane
D) Icosane - Transition elements are the elements that are found in Groups 3-12 of the modern periodic table, that constitute the _____.
A) d-block
B) s-block
C) p-block
D) f-block - Which of the following is a saturated hydrocarbon?
A) C₃H₈
B) C₂H₆
C) C₆H₆
D) C₄H₈ - NDP = _________.
A) GDP – Depreciation
B) GDP + Depreciation
C) GDP – Net factor income from abroad
D) GDP + Net factor income from abroad - Which of the following is NOT a physical change?
A) Heating of iron rod to red hot
B) Curdling of milk
C) Evaporation of diesel
D) Sublimation of NH₄Cl - Which acid is used as a souring agent added to vinegar, pickled vegetables, and sauces, and as a raw material for seasoning?
A) Citric acid
B) Acetic acid
C) Tartaric acid
D) Formic acid - The cause of a redox reaction is the:
A) transfer of electrons between two reactants
B) transfer of electrons between two products
C) transfer of neutrons between two reactants
D) exchange of halogens between two reactants - Identify a monoatomic molecule.
A) Carbon monoxide
B) Oxygen
C) Helium
D) Chlorine - Which of the following pairs is INCORRECTLY matched?
A) Lactose: Milk
B) Starch: Egg yolk
C) Fructose: Grapes
D) Maltose: Wheat, cornmeal and barley - What is the gas evolved when zinc reacts with sulphuric acid?
A) Hydrogen
B) Oxygen
C) Carbon dioxide
D) Hydrogen sulphide - Match the terms in column A with their respective properties in column B.
| Column A | Column B |
| i) Glucose | a) Intermediate substance in breakdown of glucose |
| ii) Yeast | b) Glucose is converted into pyruvic acid |
| iii) Glycolysis | c) Uses nutrients for fermentation process |
| iv) Pyruvic acid | d) Best organic sbstrate for respiration |
A) i-b, ii-a, iii-d, iv-c
B) i-d, ii-c, iii-b, iv-a
C) i-a, ii-b, iii-c, iv-d
D) i-b, ii-d, iii-a, iv-c
- Which of the following gases get released when dilute sulphuric acid (H₂SO₄) reacts with magnesium (Mg)?
A) SO₃
B) SO₂
C) O₂
D) H₂ - What is the product formed when zinc and sulphuric acid react?
A) Zinc sulphate
B) Zinc hydroxide
C) Zinc sulphide
D) Zinc oxide - Which of the following elements is a metalloid?
A) Iron
B) Oxygen
C) Sodium
D) Silicon - Which gas is evolved when iron and water react?
A) Hydrogen
B) Oxygen
C) Ammonia
D) Methane - Which of the following is NOT a halogen gas?
A) F
B) He
C) Cl
D) Br - ‘Au’ is the symbol for which of the following elements?
A) Gold
B) Aluminium
C) Silver
D) Argon - Which number is called Avogadro’s constant, named after the 19th-century scientist Amedeo Avogadro?
A) 6.022 × 10²³
B) 6.020 × 10²³
C) 6.032 × 10²³
D) 6.012 × 10²³ - Which of the following chemical reactions takes place when quick lime reacts with water?
A) CaO(s) + H₂O(l) → Ca + H₂(aq)
B) C(s) + O₂(g) → CO₂(g)
C) CaO(s) + H₂O(l) → Ca(OH)₂(aq)
D) CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g) - Identify the structural formula for magnesium hydroxide.
A) MgOH
B) MgO
C) Mg₂H₂
D) Mg(OH)₂
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SSC CGL 2024 Tier 1 Science MCQ [Biology]
- The growth form of a plant, comprising its size, shape, and orientation is known as:
A) habit
B) environment
C) habitat
D) growth pattern - Hubbardia heptaneuron, which has become endangered, is a species of which of the following?
A) Grass
B) Bamboo
C) Tiger
D) Crane - What kind of phyllotaxy was examined in the Guava plant?
A) Superimposed
B) Whorled
C) Alternate
D) Opposite - The headquarters of the second Green Revolution cell was in ________.
A) Raipur
B) Patna
C) Kolkata
D) Bhubaneswar - Which species is known as black-lipped pearl oyster found in the Indo-Pacific, within tropical coral reefs?
A) Aplysia dactylomela
B) Dentalium neohexagonum
C) Chaetopleura apiculata
D) Pinctada margaritifera - Match the points under Column A with those under Column B
| Column A (Subphylum) | Column B (Animal) |
| i) Hexapoda | a) Daphnia |
| ii) Crustacea | b) Mosquito |
| iii) Myriapoda | c) Limulus |
| iv) Chelicerata | d) Julus |
A) i-b, ii-c, iii-a, iv-d
B) i-a, ii-b, iii-c, iv-d
C) i-d, ii-c, iii-b, iv-a
D) i-b, ii-a, iii-d, iv-c
- The green revolution technology resulted in an increase in production of cereal production from 72.4 million tons in 1965-66 to ________ million tons in 1978-79.
A) 150.8B) 165.9
C) 131.9
D) 141.2 - Which of the following is NOT a member of the Aves (birds) class?
A) Psittacula
B) Neophron
C) Pteropus
D) Struthio - Which types of gametes are found in Spirogyra?
A) Isogamous and flagellated
B) Heterogamous and non-flagellated
C) Heterogamous and flagellated
D) Isogamous and non-flagellated - Which of the following categories does Gonyaulax belong to?
A) Euglenoids
B) Chrysophytes
C) Protozoans
D) Dinoflagellates - In the context of cell division, which chromosomal behaviour takes place at the leptotene stage?
A) Chromosomes are un-synapsed
B) Synapsis is complete
C) Homologous chromosomes pair
D) Chromosomes begin to condense - Which marine carotenoid is abundant in brown seaweed, macroalgae, and diatoms?
A) Fucoxanthin
B) Astaxanthin
C) Neoxanthin
D) β-cryptoxanthin - Which law states that endothermic animals from cold climates have smaller extremities or appendages than closely related species from warm climates?
A) Harper’s rule
B) Reich’s rule
C) Allen’s rule
D) Moller’s rule - Which of the following is the best definition of ecological efficiency?
A) The amount of energy utilised at different trophic levels in a food chain
B) The amount of energy stored at different trophic levels in a food chain
C) The ratio between the mass and the energy flow at different trophic levels in a food chain
D) The ratio between energy flows at different points in a food chain - What do we mean by Allen’s rule?
A) Mammals from colder climates generally have shorter ears and limbs to minimise heat loss.
B) Desert lizards lack the physiological ability that mammals have to deal with the high temperatures of their habitat.
C) Some plants have no leaves – they are reduced to spines – and the photosynthetic function is taken over by the flattened stems.
D) The body compensates low oxygen availability by increasing red blood cell production, decreasing the binding affinity of haemoglobin, and by increasing the breathing rate. - Which essential amino acid enhances calcium absorption and also plays an important role in the formation of collagen?
A) Arginine
B) Tyrosine
C) Lysine
D) Histidine - Which of the following is related to neem?
A) Tendril
B) Palmately
C) Pinnately
D) Spines - What is the reason for the similar size of the vascular bundle in monocot leaves?
A) Cubical venation
B) Radial venation
C) Rectangular venation
D) Parallel venation - Which of the following options indicates the size of PPLO (Pleuro Pneumonia Like Organisms)?
A) About 30 μm
B) About 20 μm
C) About 0.1 μm
D) About 10 μm - What is the name of the inflammatory condition that causes cracks, crusting, and scaling at the corners of the mouth due to vitamin B2 deficiency?
A) Cheilosis
B) Psoriasis
C) Urticaria
D) Atopic dermatitis - Which of the following is responsible for the red colour of beetroot?
A) Curcumin
B) Betanin
C) Beta carotene
D) Lycopene - Which of the following is an inactivated (killed) polio vaccine developed in 1952?
A) Salk vaccine
B) Imvanex vaccine
C) HDCV vaccine
D) TAB vaccine - Find out why white silver chloride turns grey in sunlight.
A) Due to rusting of silver in the presence of oxygen
B) Due to redox reaction
C) Due to the decomposition of silver chloride into silver and chlorine by light
D) Due to the displacement of silver chloride to silver oxide - Which of the following does NOT belong to the category of Porifera?
A) Hydra
B) Sycon
C) Spongilla
D) Euplectella - Which of the following classes includes the family of turtles?
A) Chondrichthyes
B) Reptilia
C) Amphibia
D) Aves - Which of the following illustrations is related to chloroplasts?
A) d B) b C) c D) a
- Who published Systema Naturae in 1735 classifying the three kingdoms of nature and outlining the sexual system for the classification of plants?
A) Carl Woese
B) Robert Whittaker
C) Ernst Haeckel
D) Carolus Linnaeus - Which cell organelle is defined as the small round organelle that undergoes oxidation reaction to produce hydrogen peroxide?
A) Centrosome
B) Vacuole
C) Nucleus
D) Peroxisomes - The organisms that do not have a defined nucleus or organelles are classified into _______ Kingdom.
A) Fungi
B) Protista
C) Monera
D) Plantae - Name a common electrolyte disorder that occurs when the amount of sodium in your blood becomes abnormally low.
A) Hyperkalemia
B) Hypokalemia
C) Hyponatremia
D) Hypernatremia - What is the other name of tetanus caused by toxin-producing bacteria called Clostridium tetani?
A) Lockjaw
B) Snap jaw
C) Cleft jaw
D) Broken jaw - By which of the following methods do red algae reproduce?
A) Grafting
B) Cutting
C) Micropropagation
D) Fragmentation - Which of the following statements best defines monoecious?
A) A flower with both androecium and gynoecium
B) A flower with dithecous
C) A flower with gynoecium only
D) A flower with androecium only - Which of the following characteristics is NOT of Aves?
A) They have four-chambered heart.
B) They give birth to live young ones with some exceptions those lay eggs.
C) These are warm-blooded animals.
D) They breathe through the lungs. - What are the five Fs of indirect transmission?
A) Flies, fingers, fomites, food, and fluid
B) Fruit, fingers, flu, food, and fluid
C) Flies, fingers, friends, food, and fruit
D) Flies, fingers, fomites, food, and fruit - Which is a serious contagious bacterial infection that usually affects the mucous membranes of the nose and throat?
A) Meningococcal
B) Diphtheria
C) Shigellosis
D) Chlamydia - How many chambers are there in the heart of fishes?
A) 1
B) 2
C) 4
D) 3 - Which of the following statements is INCORRECT?
A) Fats and oils get reduced over time and smell bad.
B) Fats and oils are oxidised, they become rancid.
C) Antioxidants are added to foods containing fats and oil to prevent oxidation.
D) Chips manufacturers usually flush bags of chips with Nitrogen to prevent the chips from getting ranicid. - Identify a spiral-shaped bacteria.
A) Bacillus
B) Spirillum
C) Coccus
D) Vibrio - Which of the following is an example of Phylum Arthropoda?
A) Nereis
B) Butterfly
C) Hirudinaria
D) Pila - Which of the following is a non-perishable food?
A) Pulses
B) Meat
C) Curds
D) Milk - Which of the following is an example of prokaryotic cells?
A) Plasmodium
B) Leishmania
C) Yeast
D) BacteriaTop of Form - Match the points under Column A with those under Column B
| Column A | Column B |
| i) Annelida | a) Tapewarm |
| ii) Arthropoda | b) |Sea star |
| iii) Echinodermata | c) Ant |
| iv) Platyhelminathes | d) Earthworm |
A) i-d, ii-c, iii-b, iv-a
B) i-b, ii-a, iii-c, iv-d
C) i-a, ii-c, iii-b, iv-d
D) i-a, ii-b, iii-c, iv-d
- Which of the following options is associated with the class of cold-blooded animals?
A) Chameleon
B) Pavo
C) Macropus
D) Psittacula - Which of the following researchers observed densely stained reticular structures surrounding the nucleus (Hint: Figure)?
A) William Harvey
B) Francis Crick
C) Camillo Golgi
D) Louis Pasteur
- Which is the most important protein component in milk, both quantitatively and nutritionally, that accounts for about 80% of the total protein in bovine milk?
A) Actin
B) Albumin
C) Pepsin
D) Casein - Which of the following is a characteristic of both mammals and birds?
A) Viviparity
B) Pigmented skin
C) Pneumatic bones
D) Warm blooded - Which of the following is NOT a component of a flower?
A) Androecium
B) Corolla
C) Spines
D) Calyx - Which of the following are the two basic categories of an ecosystem?
A) Forest and Aquatic
B) Terrestrial and Aquatic
C) Lakes and Ponds
D) Forest and Rivers - Match the points under Column A with those under Column B
| Column A (Disease) | Column B (Organism Responsible) |
| i) Malaria | a) Vibro |
| ii) Diarrhoea | b) Salmonella |
| iii) Typhoid | c) Rotavirus |
| iv) Cholera | d) Plasmodium |
A) i-b, ii-a, iii-c, iv-d
B) i-d, ii-c, iii-b, iv-a
C) i-a, ii-c, iii-b, iv-d
D) i-a, ii-b, iii-c, iv-d
- Which set of diseases are caused by bacteria?
A) Influenza, Dengue, Cholera
B) Typhoid, Cholera, Tuberculosis
C) Dengue, Malaria, Cholera
D) Malaria, Common cold, Influenza - Microbes like Rhizobium, Nitrosomonas and Nitrobacter are used for:
A) nitrogen cycling
B) carbon cycling
C) water cycling
D) sulphur cycling - Filtration of waste products in humans happens in the kidneys. There is a large number of filtration units present inside the kidneys to help them in doing this job. These filtration units are called:
A) Bowman’s capsules
B) nephrons
C) capillaries
D) alveoli - Which organisms are classified as Aves?
A) Fishes
B) Frogs
C) Snakes
D) Birds - Digestion of food is an important function of the animal body. In animals like lions, cows, humans, etc., the process involves use of various organs starting from the mouth and ending with the anus. The longest part of this canal is known as the ________.
A) stomach
B) large intestine
C) oesophagus
D) small intestine - Which condition, also known as icterus, causes a yellowing of your skin and the whites of your eyes?
A) Ichthyosis
B) Jaundice
C) Eczema
D) Pemphigus - Which of the following can be represented as a functional unit of nature?
A) Vehicles
B) Ecosystem
C) Humans
D) Plants - Which branch of ecology deals with the characteristics of ancient environment and their relationship with ancient plants and animals?
A) Demecology
B) Ichthyology
C) Paleoecology
D) Mycology
- Which of the following is another name of vitamin C?
A) Pyridoxine
B) Pyridoxal
C) Pyridoxamine
D) Ascorbic acid - Which of the following pairs is INCORRECTLY matched?
A) Nucleus: Lipid metabolism
B) Lysosomes: Suicidal bags
C) Mitochondria: Power house of the cell
D) Ribosomes: Protein factory - Which of the following is a man-made ecosystem?
A) Aquarium
B) Dessert
C) Forest
D) Grassland - Which of the following plants is used to cure cold and cough?
A) Tulsi
B) Babool
C) Jamun
D) Arjun - Which of the following pairs is INCORRECT regarding the grade of organisation and its example?
A) Cellular grade organisation – Sycon
B) Protoplasmic grade organisation – Paramecium
C) Cell-tissue grade organisation – Jellyfish
D) Tissue-organ grade organisation – Euplectella
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