All Free Everyday Science MCQs with Answers

1461. The scientific study of teeth is called ____________?

• A. Odontology
• B. Ornithology
• C. Orthoepy
• D. Pedagogy

Explanation: Odontology is the scientific study of teeth and their diseases and treatment. Ornithology studies birds, while pedagogy concerns teaching.

1462. The Shortest (smallest) bone in human body is___________?

• A. Stapes
• B. Tibia
• C. Femur
• D. Humerus

Explanation: The stapes is the smallest bone in the human body and lies in the middle ear. It transmits vibrations from the other ear ossicles to the inner ear.

1463. The longest bone in human body is___________?

• A. Ulna
• B. Tibia
• C. Femur
• D. Humerus

Explanation: The femur, or thigh bone, is the longest and one of the strongest bones in the human body. The tibia, ulna and humerus are shorter bones of the leg or arm.

1464. How many teeth are there in human mouth?

• A. 30
• B. 33
• C. 32
• D. 31Chemistry

Explanation: A complete adult human dentition normally contains 32 permanent teeth, including four wisdom teeth. Children have 20 primary teeth, so the question assumes an adult mouth.

1465. What is the breathing rate of human being body?

• A. 15-11 minutes
• B. 16-20 minutes
• C. 25-26 minutes
• D. 32-35 minutes

Explanation: A normal resting adult breathing rate is roughly 12 to 20 breaths per minute, making 16 to 20 the matching range. Exercise, illness and age can change the rate considerably.

1466. Sunlight is a Great Source of ____________?

• A. vitamin C
• B. vitamin D
• C. vitamin E
• D. vitamin K

Explanation: Sunlight enables the skin to produce vitamin D from a cholesterol-based precursor. Vitamins C, E, and K are obtained mainly through food rather than sunlight.

1467. The study of cancer is called_____________?

• A. Zoology
• B. Ecology
• C. Genomic
• D. Oncology

Explanation: Oncology is the branch of medicine concerned with cancers, including their causes, diagnosis, and treatment. Zoology and ecology deal with animals and relationships among organisms, respectively.

1468. The human brain uses__________ percent of the total oxygen and blood in the body?

• A. 20
• B. 12
• C. 35
• D. 48

Explanation: Although the brain is only about 2% of body mass, it consumes roughly 20% of the body's oxygen and blood supply at rest. This high demand supports continuous nerve activity.

1469. A Little inhalation is done through________?

• A. cigarettes
• B. pipes and cigars
• C. Both A and B offer little inhalation
• D. both offer extreme inhalation

Explanation: Pipe and cigar smokers commonly keep the smoke in the mouth instead of inhaling it deeply into the lungs, unlike typical cigarette smoking. This does not make pipe or cigar smoking safe because the mouth and throat remain exposed to carcinogens.

1470. Deficiency of vitamin B1 is causes__________?

• A. Rickets
• B. Bone Infection
• C. Beriberi
• D. Myopia

Explanation: Vitamin B1, or thiamine, deficiency causes beriberi, which can affect the nerves, muscles, and cardiovascular system. Rickets is mainly linked to vitamin D deficiency, not B1 deficiency.