All Free Everyday Science MCQs with Answers

941. Malaria is a disease which effects the____________?

• A. Heart
• B. Lungs
• C. Spleen
• D. Kidneys

Explanation: Malaria parasites infect red blood cells and are also associated with enlargement and damage of the spleen, which removes abnormal blood cells. Among the listed organs, the spleen is the expected answer.

942. A person with which of the following blood groups can receive blood of any group?

• A. A
• B. AB
• C. B
• D. O

Explanation: In the ABO blood-group system, AB individuals have both A and B antigens but no anti-A or anti-B antibodies, so they can receive red cells from A, B, AB, or O groups. Rh compatibility is an additional consideration in actual transfusions.

943. The average heartbeat per minute in a normal man is _________?

• A. 50
• B. 70
• C. 80
• D. 100Downloading Digital Educational Resources

Explanation: A healthy adult at rest commonly has a pulse of about 60 to 80 beats per minute, making 70 the best average value. Exercise, stress, age, and illness can raise or lower it.

944. Which of the following vitamins promote healthy functioning of eyes in human beings?

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

Explanation: Vitamin A is needed for rhodopsin, a light-sensitive pigment in the retina, and helps maintain the cornea. Its deficiency can cause night blindness and other eye problems.

945. Which of the following have maximum calorific value?

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

Explanation: Fats provide about 9 kilocalories per gram, whereas carbohydrates and proteins provide about 4 kilocalories per gram. Vitamins are regulatory nutrients and do not supply significant calories.

946. Which gland in the human body is called the master gland?

• A. Pancreas
• B. Thyroid
• C. Pituitary
• D. Spleen

Explanation: The pituitary is called the master gland because its hormones regulate several other endocrine glands, including the thyroid, adrenal glands, and reproductive glands. The hypothalamus controls the pituitary.

947. How many bones are there in a newly born infant?

• A. 206
• B. 230
• C. 280
• D. 300Purchasing Educational Biology Kits

Explanation: A newborn is commonly said to have about 300 bones, many of which later fuse as the skeleton develops. This number is approximate, while the standard adult count is 206.

948. Which is the largest gland in the human body?

• A. Thyroid
• B. Liver
• C. Pancreas
• D. None of these

Explanation: The liver is the largest gland in the human body and performs metabolic, detoxification, storage, and bile-producing functions. The thyroid is a major endocrine gland but is much smaller.

949. A person of which of the following blood groups is called a universal donor?

• A. O
• B. AB
• C. A
• D. B

Explanation: O-negative red blood cells are traditionally called universal donor blood because they lack A, B, and RhD antigens. In the simplified ABO classification used here, the answer is O.

950. Which of the following glands secrete tears?

• A. Lachrymal
• B. Pituitary
• C. Thyroid
• D. Pancreas

Explanation: Lacrimal, or lachrymal, glands produce tears that lubricate and protect the eye. The pituitary, thyroid, and pancreas are endocrine or digestive glands with different functions.