Class 10 – Science Extra Questions – Ch. 7 – How do Organisms Reproduce Q. 1 What is the definition of asexual reproduction? A) A fusion of specialised cells B) a method by which all types of organisms reproduce C) a method producing genetically identical offspring D) a method in which more than one parent […]

Class 10 – Science Extra Questions – Ch. 6 – Control And Coordination Q. 1 What functions are performed by the brain? A) thinking B) regulating the heart beat C) balancing the body D) all of the above Q. 2 Why is adding iodine to salt advised? A) diabetes B) gonorrhoea C) dysentery D) goitre

Class 10 – Science Extra Questions – Ch. 5 – Life Processes Q. 1 Which molecule serves as the primary energy source for cellular activities? A) DTP B) PDP C) ATP D) DDT Q. 2 How is the most nitrogen eliminated from a mammal’s body? A) breath B) sweat C) urine D) faeces Q. 3

Class 10 – Science Extra Questions – Ch. 4 – Carbon and Its Compounds Q. 1 What indicates that the exterior bottom of a cooking vessel is turning black A) the food is not cooked completely B) the fuel is not burning completely C) the fuel is wet D) the fuel is burning completely Q.

Class 10 – Science Extra Questions – Ch. 3 – Metals and Non Metals Q. 1 Which of the following metals is the least effective at transferring heat? A) aluminium B) silver C) gold D) lead. Q. 2 What acid is produced when sulfur trioxide reacts with water? A) sulphurous acid B) sulphuric acid C)

Class 10 – Science Extra Questions – Ch. 2 – Acids Bases and Salts Q. 1 A substance with a pH of 2 is likely to be _______. A) acidic B) alkaline C) neutral D) soapy Q. 2 When a strong acid is diluted with pure water, what happens to the pH of the resulting

Class 10 – Science Extra Questions – Ch. 1 – Chemical Reactions and Equations Q. 1 What is the chemical formula of water, which is electrolyzed to produce hydrogen and oxygen gas? A) H2O2 B) H2O C) HO D) H3O Q. 2 Which of the following chemical reactions represents a decomposition reaction? A) 2H₂ +

Class 9 – Science Extra Questions – Ch. 12 – Improvement in Food Resources Q. 1 What is the term for a fishery that utilizes saltwater environments? A) inland fishery B) marine fishery C) river water fishery D) None of these Q. 2 What is the classification of DDT A) a non-biodegradable pollutant B) a

Class 9 – Science Extra Questions – Ch. 11 – Sound Q. 1 What is the speed of a super-sonic aircraft in relation to the speed of sound A) below speed of sound B) equal to speed of sound C) more than speed of sound D) equal to speed of light. Q. 2 Two sound

Class 9 – Science Extra Questions – Ch. 10 – Work and Energy Q. 1 What form of energy is present in water held back by a dam? A) no energy B) electrical energy C) kinetic energy D) potential energy Q. 2 What is the SI unit of work A) Newton B) meter C) newton-meter