All Free Everyday Science MCQs with Answers

1451. Quantity of fresh air required for a man is 1000 cubic feet of air for every____________?

• A. 5 minutes
• B. 10 minutes
• C. 15 minutes
• D. 20 minutes

Explanation: The traditional ventilation standard used in such questions is about 1,000 cubic feet of fresh air per person every 20 minutes. This replaces exhaled air and helps limit the buildup of carbon dioxide indoors.

1452. Approximately, how many times each day do our heart valves open and close normally?

• A. 10,000
• B. 1,00,000
• C. 1,50,000
• D. 2,00,000

Explanation: At an average rate of about 70 heartbeats per minute, the valves open and close roughly 100,000 times in 24 hours. The larger figures would require an abnormally high heart rate or count.

1453. The 'stone' formed in human kidney consist mostly of_____________?

• A. Calcium oxalate
• B. Sodium acetate
• C. Magnesium sulphate
• D. Calcium

Explanation: Most kidney stones are calcium oxalate, formed when calcium combines with oxalate in concentrated urine. Pure calcium is not the usual composition, although calcium is part of many stones.

1454. In eye donation, which one of the following parts of donor's eye is utilized ?

• A. Iris
• B. Lens
• C. Cornea
• D. Retina

Explanation: Eye donation commonly provides the cornea for transplantation because a damaged or opaque cornea can block light from entering the eye. The iris, lens, and retina are generally not the donated transplant tissue in this context.

1455. The amount of energy required by the children of age between one to three years is___________?

• A. 300 k Calories
• B. 600 k Calories
• C. 900 k Calories
• D. 1200 k Calories

Explanation: Traditional nutrition tables commonly assign about 1,200 kilocalories per day to children aged one to three years. Actual needs vary with body size, activity, growth, and health, but 1,200 is the intended textbook value.

1456. Oranges are rich source of____________?

• A. Carbohydrates
• B. Fats
• C. Proteins
• D. Vitamins

Explanation: Oranges are especially known for vitamin C, although they also contain carbohydrates and other nutrients. Vitamins, rather than fats or proteins, are the intended rich source here.

1457. Most drugs are excreted through_____________?

• A. Kidney
• B. Skin
• C. Gallbladder
• D. Lungs

Explanation: The kidneys filter many drugs and their breakdown products from the blood and remove them in urine. Some substances also leave through bile, lungs, or sweat, but the kidneys are the main route for most drugs.

1458. The pancreas secrets___________?

• A. Insulin
• B. Vitamin A
• C. Bile juice
• D. none of these

Explanation: The pancreas produces insulin, a hormone that helps cells absorb glucose and keeps blood sugar within a normal range. Bile is made by the liver, not the pancreas.

1459. What does TCM stand for in medical terms?

• A. Techno Circuit Module
• B. Traditional Chinese medicine
• C. Tetra Carbon Mono oxide
• D. Tele Communication Management

Explanation: TCM commonly stands for Traditional Chinese Medicine, a system involving practices such as acupuncture and herbal treatment. The other expansions are not medical terms.

1460. Blood which heart pumps to lungs is__________?

• A. deoxygenated blood
• B. lymph fluid
• C. atria blood
• D. oxygenated blood

Explanation: The right side of the heart pumps deoxygenated blood to the lungs through the pulmonary artery, where it releases carbon dioxide and gains oxygen. Oxygenated blood returns to the left side of the heart.