All Free Everyday Science MCQs with Answers

1401. Inhaled air passes through which of the following in the last?

• A. Bronchiole
• B. Larynx
• C. Pharynx
• D. Trachea
• E. None of these

Explanation: Among the listed structures, inhaled air reaches the bronchioles after passing through the pharynx, larynx, and trachea. It then continues into alveoli, but alveoli are not included among the options.

1402. The average length of the kidney of a man is about?

• A. 7cm to 8cm
• B. 8cm to 10 cm
• C. 10cm to 13 cm
• D. 13cm to 16cm

Explanation: An adult human kidney is typically about 10 to 12 cm long, so the range of 10 to 13 cm is the appropriate choice. Kidney size varies somewhat with a person's body size and sex.

1403. In human osmoregulation takes place by___________?

• A. Liver
• B. Kidney
• C. Spleen
• D. Lungs

Explanation: The kidneys maintain osmotic balance by adjusting how much water and dissolved salts are excreted or retained in urine. This regulation is called osmoregulation.

1404. CT Scan stand for__________?

• A. Computed Tomography Scan
• B. Computer Topography Scan
• C. Computed Topography Scan
• D. Computer Tomography Scan

Explanation: CT stands for computed tomography, a technique that uses X-rays and computer processing to produce cross-sectional images of the body. “Topography” and “computer tomography” are incorrect expansions.

1405. What is the average weight of Human Heart?

• A. 300 gram
• B. 350 gram
• C. 400 gram
• D. 450 gram

Explanation: An adult human heart weighs approximately 300 grams on average, although normal weight varies with body size and sex. The larger figures listed are generally above the usual average.

1406. If you have "caries" then which doctor you have consult?

• A. Dermatologist
• B. Orthopaedist
• C. Dentist
• D. Nurologist

Explanation: Caries means tooth decay, caused by acids produced by bacteria in dental plaque, so it is treated by a dentist. A dermatologist treats skin disorders, not decayed teeth.

1407. Humans can hear in the range of ______ to _______Hertz (Hz).?

• A. 10 Hz to 10,000 Hz.
• B. 20 Hz to 20,000 Hz.
• C. 30 Hz to 30,000 Hz.
• D. 40 Hz to 40,000 Hz.

Explanation: Normal human hearing is conventionally given as about 20 Hz to 20,000 Hz, though the upper limit often decreases with age. Frequencies below 20 Hz are infrasonic and those above 20,000 Hz are ultrasonic for humans.

1408. Adult human brain is about_________% of the total body weight.

• A. 2%
• B. 3%
• C. 7%
• D. 8%Biological Sciences

Explanation: The adult brain weighs roughly 1.3 to 1.4 kg, which is about 2% of average adult body weight. It consumes a much larger share of the body's energy, so its energy use should not be confused with its mass percentage.

1409. In Fishes excretory Product is__________?

• A. Nitrogen
• B. Ammonia
• C. Uria
• D. Carbon dioxide

Explanation: Most fishes are ammonotelic, meaning they excrete toxic ammonia, mainly through the gills and in dilute urine. Nitrogen is an element in ammonia, not the specific excretory product asked for.

1410. What is the weight of the average human brain?

• A. 1.2 to 1.4 Kg
• B. 1.4 to 1.8 Kg
• C. 2.1 to 2.8 Kg
• D. 3.1 to 3.4 Kg

Explanation: An average adult human brain weighs about 1.3 to 1.4 kg, although its mass varies with age, sex and body size. The other ranges are considerably above the normal adult value.