100 General Science MCQs For Competetive Tests

Welcome to this collection of 100 General Science Multiple-Choice Questions (MCQs) designed to test and enhance your understanding of various scientific disciplines. These general science MCQs encompass a diverse array of scientific domains, from biology and chemistry to physics, astronomy, and environmental science. Whether you’re looking to challenge your existing knowledge or broaden your scientific horizons, these general science MCQs offer a stimulating journey through the world of scientific exploration and discovery. So, let’s embark on this intellectual adventure and delve into the realms of science, where curiosity knows no bounds.

Get Ready!

100 General Science MCQs: Biology:

1. What is the basic unit of life?

   a) Cell

   b) Atom

   c) Molecule

   d) Organ

2. Which organelle is responsible for protein synthesis in a cell?

   a) Nucleus

   b) Golgi apparatus

   c) Mitochondrion

   d) Ribosome

3. Photosynthesis primarily occurs in which part of a plant cell?

   a) Nucleus

   b) Mitochondria

   c) Chloroplast

   d) Vacuole

4. Which molecule carries genetic information in a cell?

   a) DNA

   b) RNA

   c) Protein

   d) Lipid

5. What is the process by which cells divide to form new cells?

   a) Respiration

   b) Digestion

   c) Replication

   d) Mitosis

100 General Science MCQs: Chemistry:

6. What is the smallest unit of an element that retains its chemical properties?

   a) Molecule

   b) Atom

   c) Compound

   d) Ion

7. Which gas is responsible for the greenhouse effect?

   a) Oxygen

   b) Carbon dioxide

   c) Nitrogen

   d) Hydrogen

8. What is the chemical symbol for gold?

   a) Ag

   b) Au

   c) Fe

   d) Cu

9. Which acid is found in citrus fruits?

   a) Sulfuric acid

   b) Nitric acid

   c) Citric acid

   d) Hydrochloric acid

10. What is the pH value of a neutral substance?

    a) 7

    b) 1

    c) 14

    d) 0

100 General Science MCQs: Physics:

11. What is the SI unit of force?

    a) Joule

    b) Newton

    c) Watt

    d) Ohm

12. Which scientist is known for the laws of motion and universal gravitation?

    a) Albert Einstein

    b) Isaac Newton

    c) Galileo Galilei

    d) Nikola Tesla

13. What is the speed of light in a vacuum?

    a) 300,000 km/s

    b) 150,000 km/s

    c) 3,000 km/s

    d) 30,000 km/s

14. What is the phenomenon where a wave bends as it passes from one medium to another?

    a) Diffraction

    b) Dispersion

    c) Reflection

    d) Refraction

15. What is the energy of motion called?

    a) Potential energy

    b) Kinetic energy

    c) Thermal energy

    d) Mechanical energy

100 General Science MCQs: Molecular Biology:

16. Which molecule carries amino acids to the ribosome during protein synthesis?

    a) DNA

    b) RNA

    c) tRNA

    d) rRNA

17. What is the process by which DNA is copied into mRNA?

    a) Translation

    b) Transcription

    c) Replication

    d) Mutation

18. Which enzyme is responsible for unwinding the DNA double helix during replication?

    a) DNA polymerase

    b) Helicase

    c) Ligase

    d) RNA polymerase

19. What is the central dogma of molecular biology?

    a) DNA → RNA → Protein

    b) Protein → DNA → RNA

    c) RNA → DNA → Protein

    d) Protein → RNA → DNA

20. What is the full name of the DNA structure proposed by James Watson and Francis Crick?

    a) Triplet helix

    b) Alpha helix

    c) Beta sheet

    d) Double helix

100 General Science MCQs: Health and Diseases:

21. Which infectious disease is characterized by red spots, and high fever, and is vaccine-preventable?

    a) Tuberculosis

    b) Measles

    c) Malaria

    d) Cholera

22. Which organ is affected by hepatitis?

    a) Heart

    b) Liver

    c) Kidneys

    d) Lungs

23. What is the medical term for the loss of memory?

    a) Amnesia

    b) Alzheimer’s

    c) Dementia

    d) Parkinson’s

24. Which of the following is a non-communicable disease?

    a) Influenza

    b) Diabetes

    c) Tuberculosis

    d) Malaria

25. What is the primary cause of antibiotic resistance?

    a) Overuse of antibiotics

    b) Lack of vaccinations

    c) Genetic mutations

    d) Poor hygiene practices