Science and Mathematics Quiz

Which instrument was launched by ISRO in 2023 to study solar activities?

• PRAGYAN

• ADITYA-L1

• CHANDRAYAAN

• MANGALYAAN

Answer explanation

ISRO launched ADITYA-L1 in 2023 to study solar activities, focusing on the Sun's outer layer and its impact on space weather. PRAGYAN, CHANDRAYAAN, and MANGALYAAN are related to lunar and Martian exploration, not solar studies.

Which gas is used in modern refrigerators as an eco-friendly alternative to CFCs?

• Ammonia

• R-134a

• Methane

• Freon

Answer explanation

R-134a is a hydrofluorocarbon (HFC) used in modern refrigerators as a more eco-friendly alternative to CFCs, which are harmful to the ozone layer. Ammonia and Freon are not suitable replacements, and methane is not used in refrigeration.

The main function of white blood cells is to:

• Carry oxygen

• Produce hormones

• Fight infections

• Store energy

Answer explanation

The main function of white blood cells is to fight infections. They are a crucial part of the immune system, helping to protect the body against pathogens and foreign invaders.

Which of the following is not a renewable source of energy?

• Solar

• Wind

• Natural Gas

• Hydroelectric

Answer explanation

Natural gas is a fossil fuel, not a renewable energy source. In contrast, solar, wind, and hydroelectric power are renewable as they are naturally replenished and sustainable over time.

What is the full form of DNA?

• Dioxin Nucleic Acid

• Deoxyribonucleic Acid

• Dinucleotide Acid

• Dimerized Nucleic Acid

Answer explanation

The full form of DNA is Deoxyribonucleic Acid. It is the molecule that carries genetic information in living organisms, distinguishing it from the incorrect options provided.

Which part of the human brain is responsible for maintaining balance and posture?

• Cerebrum

• Medulla

• Cerebellum

• Thalamus

Answer explanation

The cerebellum is the part of the brain that coordinates movement and maintains balance and posture. It processes sensory information and fine-tunes motor activity, making it essential for physical stability.

What is the chemical name of common salt?

• Sodium Carbonate

• Potassium Chloride

• Sodium Chloride

• Calcium Carbonate

Answer explanation

The chemical name of common salt is Sodium Chloride (NaCl). It is composed of sodium and chloride ions, distinguishing it from other options like Sodium Carbonate and Potassium Chloride.

What causes the blue color of the sky?

• Absorption of light

• Reflection of clouds

• Scattering of sunlight by air molecules

• Refraction by ozone layer

Answer explanation

The blue color of the sky is caused by the scattering of sunlight by air molecules. Shorter blue wavelengths scatter more than other colors, making the sky appear blue to our eyes.

Which Nobel-winning technology was used to rapidly develop COVID-19 mRNA vaccines?

• CRISPR-Cas9

• mRNA platform

• Recombinant DNA

• DNA fingerprinting

Answer explanation

The mRNA platform was crucial for the rapid development of COVID-19 vaccines, allowing for quick design and production of vaccines using messenger RNA technology, which is a significant advancement in vaccine development.

Which vitamin is produced in the skin when exposed to sunlight?

• Vitamin A

• Vitamin C

• Vitamin D

• Vitamin B12

Answer explanation

Vitamin D is synthesized in the skin when it is exposed to sunlight, specifically UVB rays. This process is essential for maintaining healthy bones and immune function.