A radioactive element has a half-life of 10 years. What fraction of the original sample remains after 30 years?

The correct answer is C: 1/8. After 30 years = 3 half-lives: N = N₀ × (1/2)³ = N₀/8. The sample reduces by half three times successively.

Largest gland in human body?

The correct answer is C: Liver. Liver is largest gland.

What is the primary reason why Venus experiences a runaway greenhouse effect compared to Earth, despite being only slightly closer to the Sun?

The correct answer is A: Venus has a much thicker atmosphere composed primarily of carbon dioxide with clouds of sulfuric acid. Venus's dense atmosphere (90 times denser than Earth's) is composed of 96.5% carbon dioxide with clouds of concentrated sulfuric acid, creating an extreme greenhouse effect with surface temperatures around 465°C. This massive atmospheric composition traps far more infrared radiation than Earth's atm

A car moving at 20 m/s suddenly applies brakes with deceleration of 5 m/s². How far does it travel before stopping?

The correct answer is B: 40 m. Using v² = u² + 2as, where v = 0, u = 20 m/s, a = -5 m/s². We get s = 400/10 = 40 m

Which of the following is a hydrophobic protein complex involved in photosynthesis?

The correct answer is B: Photosystem I (PSI) in thylakoid membrane. Photosystem I is an integral membrane protein complex with multiple transmembrane domains, making it hydrophobic. Rubisco is soluble, while ferredoxin and plastocyanin are soluble electron carriers. This biochemical distinction is important for understanding photosynthetic mechanisms.

Home

Home › Subjects › General Science › Biology

General Science
Biology

Physics, Chemistry, Biology and more

2 Q 8 Topics Take Mock Test

Difficulty: All Easy Medium Hard 1–2 of 2

Topics in General Science

All Physics 106 Chemistry 9 Biology 2 Botany 78 Human Body 4 Disease & Health 2 Space & Astronomy 5 Environment 1

Q.1 Easy Biology

Powerhouse of cell?

A Nucleus

B Ribosome

C Mitochondria

D Lysosome

Correct Answer: C. Mitochondria

EXPLANATION

Mitochondria produces ATP.

Test

Q.2 Easy Biology

DNA stands for?

A Deoxyribose Nucleic Acid

B Deoxyribonucleic Acid

C Double Nucleic Acid

D Deoxyribonicotinic Acid

Correct Answer: B. Deoxyribonucleic Acid

EXPLANATION

DNA = Deoxyribonucleic Acid.

Test

All Subjects & Topics

Govt. Exams

Entrance Exams

Teacher Exams

Subjects

Quick Links

General Science Biology

General Science
Biology