All Free Everyday Science MCQs with Answers

1041. Which of the following is the strongest & longest bone of human body?

• A. Stapes
• B. Femur
• C. Tibia
• D. None of the above

Explanation: The femur is the longest and strongest bone in the human body, extending from the hip to the knee. The stapes is the smallest bone, while the tibia is a major lower-leg bone but not the longest.

1042. Which of the following is the largest gland of the Human body _________?

• A. Lungs
• B. Liver
• C. Skin
• D. Gall Bladder

Explanation: The liver is the largest gland and the largest internal organ in the human body. The skin is the largest organ overall, but it is not usually classified as the largest gland.

1043. Water soluble Vitamins are _________?

• A. A & D vitamins
• B. B & C vitamins
• C. A & K vitamins
• D. B & K vitamins

Explanation: Vitamins B and C dissolve in water and are not stored extensively in the body, so regular dietary intake is important. Vitamins A and D are fat-soluble and can accumulate in body tissues.

1044. Vitamins A,D,E & _______ are fat soluble .

• A. Vitamin B
• B. Vitamin C
• C. Vitamin K
• D. AOT

Explanation: The fat-soluble vitamins are A, D, E and K, remembered by the phrase ADEK. Vitamins B and C are water-soluble.

1045. RBCs are also called as_______?

• A. Leucocytes
• B. Erythrocytes
• C. Nucleotides
• D. AOT

Explanation: Red blood cells are called erythrocytes, from Greek roots meaning red cells. Leucocytes are white blood cells, so they are a different blood-cell type.

1046. WBCs are also called as _________?

• A. Leukocytes
• B. Lymphocytes
• C. Nucleotides
• D. Erythrocytes

Explanation: White blood cells are collectively called leukocytes or leucocytes and defend the body against infection. Lymphocytes are only one type of leukocyte, while erythrocytes are red blood cells.

1047. The percentage of blood cells in the Blood of human body is _________?

• A. 40%
• B. 45%
• C. 50%
• D. 60%Vitamins & Supplements

Explanation: Blood consists of about 55% plasma and about 45% formed elements, including red cells, white cells and platelets. Thus, the cellular portion is approximately 45%, although the exact percentage varies slightly.

1048. The percentage of plasma in human Blood is _________?

• A. 50%
• B. 55%
• C. 60%
• D. 80%

Explanation: Plasma makes up approximately 55% of human blood, while blood cells and platelets together make up roughly 45%. This is why the two standard figures are usually given as 55% and 45%.

1049. Which of the following is not a Fat-soluble vitamin?

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

Explanation: Vitamin B is water-soluble, whereas vitamins A, D and E are fat-soluble. Vitamin K is also fat-soluble, completing the common ADEK group.

1050. Despite the fluctuation in human body temperature. The temperature of human body remains at _________?

• A. 35 °C
• B. 37 °C
• C. 42 °C
• D. 54 °C

Explanation: The normal average core temperature of the human body is about 37 °C, although it varies with time of day, activity and measurement site. The body maintains this narrow range through thermoregulation.