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20 Most Repeated Everyday Science MCQs for NTS, CSS, PMS, KPPSC, PPSC, ETEA, SPSC, BPSC, and FPSC Tests
Here is most repeated Everyday Science MCQs. These questions frequently appear in past papers for NTS, CSS, PMS, and various provincial public service commission exams, making them essential for your test preparation.
Most Repeated Everyday Science MCQs
1
What is the average lifespan of a Red Blood Cell (RBC) in the human body?
Explanation
Correct Answer: Option C
Red blood cells (erythrocytes) circulate in the blood for about 120 days before they become damaged or worn out and are removed by the spleen and liver.
2
What is the chemical name for "Heavy Water"?
Explanation
Correct Answer: Option B
3
Which instrument is used to measure atmospheric pressure?
Explanation
Correct Answer: Option C
4
What is the most abundant element in the universe?
Explanation
Correct Answer: Option B
Hydrogen makes up about 75% of the normal matter in the universe, serving as the primary fuel for stars, including our Sun.
5
"Dry Ice" is the solid form of which gas?
Explanation
Correct Answer: Option D
Dry ice is solid carbon dioxide. It is called "dry" because it sublimates (turns directly from a solid into a gas) without leaving any liquid residue.
6
What is the normal temperature of the human body?
Explanation
Correct Answer: Option B
7
In the human body, the digestion of food is entirely completed in the:
Explanation
Correct Answer: Option C
While digestion begins in the mouth and continues in the stomach, the final breakdown of food and the absorption of nutrients occur almost entirely in the small intestine.
8
Which of the following are the primary colors of light?
Explanation
Correct Answer: Option B
In physics and electronics (like TV screens and monitors), the primary colors of light are Red, Green, and Blue (RGB). Mixing these colors of light in various proportions can create any other color.
9
A person with which blood group is known as a "Universal Recipient"?
Explanation
Correct Answer: Option C
People with AB positive blood have both A and B antigens on their red blood cells, as well as the Rh factor, meaning their immune system will not attack transfused blood of any type.
10
Which vitamin is primarily synthesized in the human skin through exposure to sunlight?
Explanation
Correct Answer: Option D
When ultraviolet B (UVB) rays from the sun hit the skin, they trigger a chemical reaction that produces Vitamin D, which is essential for bone health.
11
What is the hardest naturally occurring substance on Earth?
Explanation
Correct Answer: Option C
12
Bile is a digestive fluid produced by the:
Explanation
Correct Answer: Option C
The liver produces bile, which helps break down and absorb fats. The gallbladder merely stores and concentrates the bile until it is needed.
13
Which gas is the primary contributor to the greenhouse effect and global warming?
Explanation
Correct Answer: Option C
While other gases like methane are also potent greenhouse gases, Carbon Dioxide is the primary contributor due to the sheer volume emitted by human activities, such as burning fossil fuels.
14
Which is the lightest of all known gases?
Explanation
Correct Answer: Option B
15
Sound waves cannot travel through:
Explanation
Correct Answer: Option D
Sound relies on the vibration of particles in a medium (like air, water, or steel) to propagate. Because a vacuum is entirely empty of matter, sound cannot travel through it.
16
What is the SI unit of Force?
Explanation
Correct Answer: Option C
Force is measured in Newtons (N). One Newton is the force needed to accelerate one kilogram of mass at the rate of one meter per second squared.
17
Which planet is closest to the Sun?
Explanation
Correct Answer: Option C
Mercury is the innermost planet in our solar system. Despite being closest to the Sun, Venus is actually hotter due to its thick atmosphere.
18
Which instrument is used to measure electrical current in a circuit?
Explanation
Correct Answer: Option B
An ammeter is used to measure the current flowing through a circuit in amperes (amps). A voltmeter measures voltage, and an ohmmeter measures resistance.
19
A deficiency of Vitamin A primarily causes:
Explanation
Correct Answer: Option C
Vitamin A is crucial for maintaining a clear cornea and is a component of rhodopsin, a protein in your eyes that allows you to see in low light conditions.
20
What is the approximate speed of light in a vacuum?
Explanation
Correct Answer: Option A
Light travels at a constant, finite speed of 299,792 kilometers per second in a vacuum, which is generally rounded to 300,000 km/s for simplicity in everyday science.
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