All Free Everyday Science MCQs with Answers

1381. Which of the following regulates the Metabolism Of Sugar?

• A. Thyroid
• B. Insulin
• C. Glucose
• D. None of These

Explanation: Insulin lowers blood glucose by helping body cells take up glucose and by promoting its storage as glycogen. The thyroid affects metabolism generally, but it does not directly regulate blood sugar in this way.

1382. Saliva contains__________?

• A. Amylases
• B. Bite
• C. Trypsin
• D. None of these

Explanation: Saliva contains salivary amylase, an enzyme that begins the digestion of starch into smaller sugars in the mouth. Trypsin acts later in the small intestine, while “bite” is not a digestive enzyme.

1383. What amount of fats give energy of 9.3 K Calories?

• A. 0.5 gram
• B. 1.0 gram
• C. 2.0 gram
• D. 4.1 gram

Explanation: Fat provides about 9.3 kilocalories per gram, more than double the energy supplied by one gram of carbohydrate or protein. Therefore 1.0 gram of fat gives the stated energy.

1384. One gram of carbohydrates give energy of the amount?

• A. 2 K Calories
• B. 4.1 K Calories
• C. 6.3 K Calories
• D. 8.0 K Calories

Explanation: Carbohydrates supply approximately 4.1 kilocalories per gram when metabolised. Fats supply about 9.3 kilocalories per gram, so the higher values are not appropriate here.

1385. The muscles, tissues and blood all are made up of____________?

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

Explanation: Proteins are major structural and functional components of muscles, tissues and blood, including muscle fibres, connective tissue and blood proteins. These body materials also contain water and other substances, but protein is the intended nutrient category.

1386. The human blood is divided into__________ groups?

• A. Two groups
• B. Three groups
• C. Four groups
• D. Five groups

Explanation: The basic ABO blood-group system divides human blood into A, B, AB and O, making four groups. The Rh factor is a separate classification, such as positive or negative.

1387. Nitrogen occurs in plant and animals in the form of ___________?

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

Explanation: Plants obtain nitrogen and animals receive it mainly in proteins, which contain nitrogen in their amino acids. Fats and carbohydrates normally contain carbon, hydrogen and oxygen but no nitrogen.

1388. In blood, the percentage of water is___________?

• A. 75%
• B. 85%
• C. 90%
• D. 95%Chemistry

Explanation: Blood is roughly 90% water by volume, with the remaining portion consisting mainly of blood cells, proteins, salts and other dissolved substances.

1389. Which term describes the emission of light by a living organism?

• A. Natural light
• B. Bioluminescence
• C. Illumination
• D. Mimicry

Explanation: Bioluminescence is light produced by a living organism through a chemical reaction, as in fireflies and some deep-sea organisms. Illumination is simply the act or result of providing light.

1390. Vitamin C is found in_________?

• A. Sea Food
• B. Seeds
• C. Fruits and Vegetables
• D. None of these

Explanation: Vitamin C is abundant in fruits and vegetables, especially citrus fruits, guava, peppers, and leafy greens. It is not generally associated with seafood or seeds as the main dietary source.