Science
Our Environment What is an ecosystem?a) A collection of only animals in a regionb) A system where living and non-living components interactc) A group of planetsd) A process of food productionAnswer: b) A system where living and non-living components interact Which of the following is a natural ecosystem?a) Aquariumb) Gardenc) Pondd) Crop fieldAnswer: c) Pond […]
Magnetic Effects of Electric Current What happens when an electric current passes through a metallic conductor?a) It produces heatb) It produces lightc) It produces a magnetic fieldd) It produces soundAnswer: c) It produces a magnetic field Which phenomenon demonstrates the relationship between electricity and magnetism?a) Heating effectb) Deflection of compass needlec) Generation of soundd) Flow
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Electricity 1. What is the SI unit of electric current?A) VoltB) AmpereC) OhmD) CoulombAnswer: B) Ampere 2. Which instrument measures electric current in a circuit?A) VoltmeterB) AmmeterC) GalvanometerD) RheostatAnswer: B) Ammeter 3. How does a switch function in an electric circuit?A) Generates electricityB) Opens or closes the circuitC) Increases resistanceD) Decreases voltageAnswer: B) Opens or
The Human Eye and the Colorful World What is the transparent bulge on the front surface of the eyeball called?a) Corneab) Retinac) Irisd) PupilAnswer: a) Cornea What part of the eye controls the size of the pupil?a) Retinab) Corneac) Irisd) Optic nerveAnswer: c) Iris Where is the image formed in the human eye?a) Corneab)
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Light Reflection and Refraction What is the principal focus of a concave mirror?a) The point where parallel rays convergeb) The point where rays divergec) The point where the mirror is curvedd) The center of curvatureAnswer: a) The point where parallel rays converge The radius of curvature of a spherical mirror is 20 cm. What
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Heredity 1. What is heredity?a) The process of creating DNAb) The transmission of traits from one generation to the nextc) The study of living organismsd) The process of asexual reproductionAnswer: b 2. What leads to variations in sexually reproducing organisms?a) Environmental factorsb) DNA copying errorsc) Independent inheritance of traitsd) All of the aboveAnswer: d 3.
How to Organisms Reproduce 1. Why do organisms reproduce?a) To maintain their body designb) To ensure species survivalc) To grow and developd) To obtain energyAnswer: b 2. What is the basis of variation during reproduction?a) Accurate DNA copyingb) Inaccurate DNA copyingc) Formation of identical cellsd) Environmental factors onlyAnswer: b 3. Why is variation beneficial to
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Control and Coordination What is the main function of the nervous system in animals?a) Digestionb) Control and coordinationc) Blood circulationd) ExcretionAnswer: b Which part of the brain is responsible for maintaining posture and balance?a) Forebrainb) Midbrainc) Cerebellumd) HypothalamusAnswer: c What type of receptors detect smell?a) Gustatory receptorsb) Photoreceptorsc) Olfactory receptorsd) ThermoreceptorsAnswer: c What is a
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Life Processes 1. What is the primary criterion to determine if something is alive?a) Ability to reproduceb) Ability to breathec) Presence of molecular movementsd) Ability to move visiblyAnswer: c) Presence of molecular movements 2. Viruses are often debated as living or non-living because:a) They lack oxygenb) They cannot move visiblyc) They show no molecular movement
Carbon and its Compounds What is the percentage of carbon present in the Earth’s crust?a) 0.02%b) 0.03%c) 2%d) 3%Answer: a) 0.02% Carbon achieves noble gas configuration by:a) Gaining four electronsb) Losing four electronsc) Sharing four electronsd) Donating four electronsAnswer: c) Sharing four electrons What is the atomic number of carbon?a) 4b) 6c) 8d) 10Answer:
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