Study HubHubPage 56/114Scan verified MCQs with the answer highlighted, then open explanations when you want the reasoning.
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Plant Pigments
In onion, the pink color is due to ___________?
The pink color in onions is due to the presence of anthocyanins, which are water-soluble pigments responsible for red, purple, and pink colors in many plants.
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Diseases And Disorders
Which of the following diseases affects the skin?
Pellagra is a disease caused by niacin (vitamin B3) deficiency and primarily affects the skin, causing dermatitis along with other symptoms. The other options affect bones or blood but not the skin.
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Vitamins and Nutrition
Vitamin C is essential for ___________?
Vitamin C is essential for the growth and repair of tissues because it helps in the synthesis of collagen, an important protein for skin, cartilage, tendons, ligaments, and blood vessels.
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Aviation Fuel
Aviation fuel for jet airplanes consists of purified ___________?
Aviation fuel for jet airplanes is primarily kerosene-based because it has suitable combustion properties and energy content for jet engines, unlike petrol, gasoline, or diesel.
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Vitamins And Deficiency Diseases
Deficiency of vitamin C will cause: ___________?
Vitamin C deficiency causes scurvy, a disease characterized by bleeding gums, weakness, and bruising. The other options are caused by deficiencies of different vitamins or nutrients.
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Food Science
In the manufacture of Vanaspati Ghee (also spelled Banaspati Ghee), which gas is used?
Hydrogen gas is used in the manufacture of Vanaspati Ghee through a process called hydrogenation, where hydrogen is added to vegetable oils to convert them into semi-solid fats.
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Temperature Conversion
Temperature of the Sun in Celsius scale is 6000ºC. What is its temperature in Fahrenheit?
The temperature of the Sun is approximately 6000ºC. Converting Celsius to Fahrenheit using the formula F = (C × 9/5) + 32 gives F = (6000 × 9/5) + 32 = 10832ºF, which matches option C.
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Weather Phenomena
Gales occur when the wind moves at the speed of _______.
Gales are defined as strong winds with speeds typically between 50 and 88 km/h. Among the given options, 55 km/h best fits the lower threshold for gale-force winds, making option B correct.
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Properties Of Water
Water has high density and minimum volume at ___________?
Water reaches its maximum density and minimum volume at 4°C due to the unique hydrogen bonding in water molecules, which causes it to expand upon freezing and contract as it warms to 4°C.
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Solubility
Which of the following is most soluble in water?
Among the given substances, sugar (sucrose) is the most soluble in water, with a solubility of about 211 grams per 100 mL at 25°C. Common salt (sodium chloride) is also highly soluble but less so than sugar, dissolving about 35.7 grams per 100 mL at 25°C. Camphor and sulfur have very low solubility in water, with camphor around 0.7 grams per 100 mL and sulfur essentially insoluble. Therefore, sugar is the most soluble substance in water among the options.