All Free Everyday Science MCQs with Answers

1141. In Essential thrombocythemia (ET) condition, bone marrow makes?

• A. Too few platelets
• B. Normal platelets
• C. Too many platelets
• D. Does not effect

Explanation: Essential thrombocythemia is a bone-marrow disorder in which abnormal megakaryocyte activity produces excessive platelets. This is the reverse of thrombocytopenia, which involves too few platelets.

1142. A normal platelets count range ?

• A. 1.5 lac - 4.5 lac platelets per liter blood.
• B. 1.5 lac - 4.5 lac platelets per micro-liter of blood.
• C. 1.5 million - 4.5 million platelets per liter of blood.
• D. 1.5 million - 4.5 million platelets per micro-liter of blood.

Explanation: A normal platelet count is approximately 150,000 to 450,000 per microliter of blood, written here as 1.5 to 4.5 lakh per microliter. The options using per liter or millions per microliter have incorrect units or magnitudes.

1143. Which Harmone contain iodine?

• A. Thyroxine
• B. Insulin
• C. Adrenaline.
• D. None of these

Explanation: Thyroxine, the hormone produced by the thyroid gland, contains iodine and helps regulate metabolic rate. Insulin and adrenaline do not contain iodine.

1144. Gland responsible for heightened emotions is?

• A. Pituitary gland
• B. Thoiroid gland
• C. Adrenal gland
• D. None of these

Explanation: The adrenal glands release adrenaline and related hormones during fear, stress, or excitement, producing heightened emotional and physical responses. The pituitary mainly coordinates other endocrine glands, while the thyroid controls metabolism.

1145. If the green leaves are placed under red light, their color will become________?

• A. Green
• B. Black
• C. Red
• D. Blue

Explanation: A green leaf reflects green light but absorbs much of the red light available to it. Under red light alone, it reflects very little, so it appears black or very dark.

1146. Calcaneus bone in which part of human body?

• A. Heel
• B. Hand
• C. Arm
• D. Skull

Explanation: The calcaneus is the largest tarsal bone and forms the heel of the foot. It bears much of the body’s weight during standing and walking.

1147. Tarsal bone is in the?

• A. Hand
• B. Arm
• C. Leg
• D. Foot

Explanation: Tarsal bones form the ankle and rear part of the foot. The hand contains the corresponding carpal bones.

1148. Skin has ___________ layers?

• A. One
• B. Two
• C. Three
• D. Four

Explanation: In basic anatomy, the skin is described as having three layers: epidermis, dermis and the underlying subcutaneous layer. Strictly, the subcutaneous layer is beneath the skin, but it is commonly included in school-level classifications.

1149. The red blood cells originate in the ____________?

• A. Brain
• B. Muscles
• C. Ligaments
• D. Bone Marrow

Explanation: Red blood cells are produced mainly in the red bone marrow, where blood-forming stem cells develop into mature erythrocytes.

1150. DNA is _____________?

• A. Acetic Acid
• B. A class of nucleic acids
• C. Citric Acid
• D. None of these

Explanation: DNA, or deoxyribonucleic acid, belongs to the class of nucleic acids and stores hereditary information. It is not an acid such as acetic or citric acid.