All Free Everyday Science MCQs with Answers

981. A balanced diet quality formula recommended by World Health Organization is ____________.

• A. Carbohydrates 58% + Proteins 12% + Fats 30%
• B. Mineral+Proteins+Fats
• C. Fats+Proteins+Minerals
• D. None of these

Explanation: The listed distribution totals 100% and falls within commonly cited dietary energy ranges, with most energy from carbohydrates, followed by fats and a smaller protein share. The other options are incomplete because they give no proportions and omit carbohydrates or water.

982. Chief builder of the body are ___________?

• A. Carbohydrates
• B. Proteins
• C. Fats
• D. None of these

Explanation: Proteins are called body-building nutrients because they form and repair muscles, skin, enzymes and other tissues. Carbohydrates and fats mainly supply or store energy.

983. __________ are called the powerhouses of the cell?

• A. Mitochondria
• B. Vesicles
• C. Lungs
• D. Liver

Explanation: Mitochondria produce most of a cell's usable ATP through cellular respiration, which is why they are called the cell's powerhouses. Vesicles mainly transport materials, while lungs and liver are organs, not cell organelles.

984. The energy value of food is measured in_______?

• A. Joule
• B. Calories
• C. Tesla
• D. Proteins

Explanation: Food energy is traditionally expressed in calories, especially kilocalories on nutrition labels. The joule is the SI unit of energy, but calories are the customary unit used for food energy.

985. The good sources of iodine are_______?

• A. green leafy vegetables
• B. seeds
• C. fresh vegetables and fruits
• D. sea foods

Explanation: Seafood, particularly marine fish and seaweed, is rich in iodine because marine organisms concentrate this element. Iodine is needed to make thyroid hormones.

986. For proper formation of teeth, __________ is essential?

• A. iodine
• B. copper
• C. fluorine
• D. iron

Explanation: Fluoride helps strengthen tooth enamel and makes it more resistant to acid attack and decay. The option says fluorine, but in dental health the chemically active form is fluoride.

987. Deficiency of __________ causes loss of appetite and poor growth?

• A. zinc
• B. iodine
• C. copper
• D. iron

Explanation: Zinc is needed for normal growth, appetite and tissue repair, so deficiency commonly causes poor growth and loss of appetite. Iodine mainly affects thyroid function, while iron deficiency chiefly causes anaemia.

988. Carrot is good source of Vitamin _______?

• A. Vitamin A
• B. Vitamin B
• C. Vitamin C
• D. Vitamin D

Explanation: Carrots are rich in beta-carotene, which the body converts into vitamin A. Vitamin A supports vision, healthy skin and immunity.

989. Digestion of food is completed in the __________?

• A. small intestine
• B. large intestine
• C. stomach
• D. Liver

Explanation: The small intestine completes most chemical digestion through enzymes from the intestine, pancreas and bile from the liver. It also absorbs most digested nutrients.

990. Biosensor is used to measure?

• A. Blood glucose level
• B. The body pH value
• C. Amount of hemoglobin
• D. Salinity in Urine

Explanation: The best-known medical use of a biosensor is measuring blood glucose, as in a glucometer. It combines a biological recognition element with a device that produces a measurable signal.