Introduction, occurrence and physical properties of water 1. What percentage of the Earth’s water is found in oceans? A) 50% B) 97% C) 70% D) 25% 2. What is the freezing point of pure water at sea level? A) 0°C B) 100°C C) 4°C D) -10°C 3. Which two elements compose water? A) Carbon and […]
1. What is produced by burning fossil fuels? A) Carbon monoxide B) Oxides of sulphur and nitrogen C) Water vapor D) Ozone 2. What is the pH of normal rainwater? A) 7 B) 5.6 to 6 C) 4 D) 3 3. What causes acid rain to form? A) Dissolved oxygen B) Dissolved acidic air pollutants
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Pollutants, sources of pollutants and green house effect 1. What is a pollutant? A) A beneficial substance B) A waste material that pollutes air, water, or soil C) A pure substance D) None of these 2. Which factor does NOT determine the severity of a pollutant? A) Chemical nature B) Concentration C) Color D) Persistence
Layers of atmosphere 1. What is the first layer of the atmosphere? A) Stratosphere B) Troposphere C) Mesosphere D) Thermosphere 2. Which layer extends up to 12 km above Earth’s surface? A) Stratosphere B) Mesosphere C) Troposphere D) Thermosphere 3. In which layer does the temperature decrease from 17°C to -58°C? A) Troposphere B) Stratosphere
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Introduction and Composition of atmosphere 1. What are the four natural systems of Earth? A) Hydrosphere, Lithosphere, Biosphere, Atmosphere B) Atmosphere, Stratosphere, Troposphere, Exosphere C) Lithosphere, Atmosphere, Thermosphere, Exosphere D) Atmosphere, Hydrosphere, Troposphere, Exosphere 2. Which of the following is not one of Earth’s natural systems? A) Lithosphere B) Hydrosphere C) Stratosphere D) Atmosphere 3.
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Vitamins 1. Who first noticed the existence of accessory growth factors? A) Louis Pasteur B) Hopkins C) Watson D) Funk 2. What are accessory growth factors now known as? A) Carbohydrates B) Fats C) Proteins D) Vitamins 3. Who proposed the term “Vitamin”?
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1. What are nucleic acids made up of? A) Amino acids B) Nucleotides C) Fatty acids D) Carbohydrates 2. What is a nucleotide composed of? A) Nitrogenous base, amino acid, phosphate B) Nitrogenous base, pentose sugar, phosphate C) Fatty acid, nitrogenous base, sugar D) Sugar, protein, nucleotide 3. Which type of sugar is found in
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MCQs Related to Lipids || 10th Chemistry Chapter 13 1. What are lipids made up of? A) Glucose B) Fatty acids C) Amino acids D) Nucleotides 2. What are oils and fats commonly known as? A) Triglycerides B) Peptides C) Nucleic acids D) Proteins 3. Which type of fatty acids are found in oils? A)
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Protein 1. What are proteins primarily made of? A) Lipids B) Carbohydrates C) Amino acids D) Sugars 2. Which of the following elements is NOT found in proteins? A) Nitrogen B) Carbon C) Phosphorus D) Oxygen 3. What type of bond links amino acids in proteins? A) Peptide bond B) Hydrogen bond C) Ionic bond
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Carbohydrates MCQs || 10th Chemistry Chapter 13 1. What is the general formula of carbohydrates? A) Cn(H2O)n B) CnH2On C) CnO2Hn D) CnHnO2 2. Carbohydrates are synthesized by plants through which process? A) Respiration B) Photosynthesis C) Fermentation D) Glycolysis 3. Which of the following is a monosaccharide? A) Starch B) Sucrose C) Glucose D)
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