Markhor Junior Contest Science PDF

Markhor Junior Contest Aspirant LEVEL (CLASS IX & X, O/A Level’s) SCIENCE There are 25 questions, each question carry 2 marks. Time allowed: 60 minutes Maximum Marks: 50 1. What is the primary function of...

Markhor Junior Contest Aspirant LEVEL (CLASS IX & X, O/A Level’s) SCIENCE There are 25 questions, each question carry 2 marks. Time allowed: 60 minutes Maximum Marks: 50 1. What is the primary function of the mitochondria in a cell? a) Protein synthesis b) DNA replication c) Energy production d) Cell signaling 2. Which process occurs in the small intestine? a) Protein denaturation b) Glycolysis c) Absorption of nutrients d) DNA transcription 3. What is the term for the "building blocks of life"? a) Cells b) Molecules c) Tissues d) Organs 4. Which scientist is credited with the discovery of the structure of DNA? a) Charles Darwin b) Gregor Mendel c) James Watson d) Albert Einstein 5. What is the process by which water moves through a plant, from the roots to the leaves? a) Respiration b) Photosynthesis c) Transpiration d) Osmosis  Markhor Junior Contest 6. Which element is a noble gas? a) Carbon b) Oxygen c) Nitrogen d) Argon 7. Which scientist is credited with the development of the periodic table? a) Dmitri Mendeleev b) Albert Einstein c) Marie Curie d) Charles Darwin 8. Which scientist is credited with the development of the laws of motion? a) Galileo Galilei b) Isaac Newton c) Albert Einstein d) Marie Curie 9. What is the process by which an object's velocity increases as it moves closer to a source of gravitational pull? a) Acceleration b) Deceleration c) Inertia d) Friction 10. Which type of wave requires a medium to propagate? a) Electromagnetic wave b) Mechanical wave c) Sound wave d) Light wave 11. CRISPR-Cas9 technology is most commonly used for: a) Genetically modifying crops (Correct) b) Treating infectious diseases c) Developing new antibiotics d) Carbon sequestration  Markhor Junior Contest 12. Which of the following is NOT a characteristic of prions? a) They are infectious agents composed solely of proteins b) They lack genetic material (DNA or RNA) c) They can cause neurodegenerative diseases like Mad Cow Disease d) They can be destroyed by boiling or autoclaving (correct) 13. Which quantum number describes the shape of an atomic orbital? a) Principal quantum number (n) b) Angular momentum quantum number (l) (Correct) c) Magnetic quantum number (ml) d) Spin quantum number (ms) 14. The greenhouse effect is primarily caused by the absorption of infrared radiation by: a) Nitrogen gas (N2) b) Oxygen gas (O2) c) Carbon dioxide (CO2) (Correct) d) Helium gas (He) 15. According to the theory of relativity, what happens to the mass of an object as its velocity approaches the speed of light? a) It remains constant. b) It decreases. c) It increases (Correct). d) It becomes zero. 16. What is the primary mechanism by which energy is transferred in a star like the Sun? a) Convection b) Conduction c) Radiation (Correct) d) Mechanical waves 17. Which geologic process is responsible for the formation of mountain ranges like the Himalayas? a) Weathering and erosion b) Volcanism c) Plate tectonics (Correct) d) Sedimentation 18. What is the ethical dilemma associated with the use of embryonic stem cells for research? a) Risk of infection b) High cost of treatment c) Potential for creating human clones  Markhor Junior Contest d) Difficulty in obtaining stem cells (Correct) 19. Dark matter is a hypothetical form of matter that is believed to make up most of the matter in the universe. Why is it difficult to detect dark matter directly? a) It does not emit light or interact with most forms of matter (Correct) b) It exists only in distant galaxies c) It is constantly changing form d) Technology is not yet advanced enough 20. Genetic engineering involves the manipulation of: a) Proteins b) DNA c) Carbohydrates d) Lipids 21. The process by which light energy is converted into chemical energy is: a) Cellular respiration b) Photosynthesis c) Fermentation d) Chemosynthesis 22. Which of the following is NOT a greenhouse gas? A) Carbon dioxide (CO2) B) Water vapor (H2O) C) Oxygen (O2) D) Methane (CH4) 23. In nuclear fission, a large nucleus is split into: a) Two identical smaller nuclei b) One larger and one smaller nucleus c) Protons and neutrons only d) Electrons and positrons only 24. Which theory explains the origin of the universe? a) Big Bang Theory b) Steady State Theory c) String Theory d) Quantum Theory 25. The process by which antibodies are produced in response to a specific antigen is called: a) Phagocytosis b) Inflammatory response c) The immune response d) Vaccination