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அறிவியல் : அலகு 1 : இயக்க விதிகள் I.  சரியான விடையைத் தேர்ந்தெடு. 1. கீழ்க்கண்டவற்றுல் நிலைமம் எதனைச் சார்ந்தது விடை ; பொருளின் நிறை 2. கணத்தாக்கு கீழ்கண்டவற்றுள் எதற்குச் சமமானது. விடை ; உந்த மாற்றம் 3. கீழ்கண்டவற்றிள் நியூட்டனின் மூன்றாம் விதி எங்கு பயன்படுகிறது. விடை ; அ மற்றும் ஆ 4. உந்த மதிப்பை y அச்சிலும் காலத்தினை x அச்சிலும் கொண்டு ஒரு வரைபடம் வரையப்படுகிறது. இவ்வரைபட சாய்வின் […]

Science : Chapter 23 : Visual Communication I. Choose the best answer 1. Which software is used to create animation ? Ans ; Scratch 2. All files are stored in the __________. Ans ; Folder 3. Which is used to build scripts? Ans ; Script area 4. Which is used to edit programs? Ans ;

Science : Chapter 22 : Environmental Management I.  Fill in the blanks 1. Deforestation leads to __________in rainfall. Ans ; Decrease 2. Removal of soil particles from the land is called __________. Ans ; Soil erosion 3. Chipko movement is initiated against __________. Ans ; Cutting trees / Deforestation 4. __________is a biosphere reserve in

Science : Chapter 21 : Health and Diseases I. Choose the best answer 1. Tobacco consumption is known to stimulate secretion of adrenaline. The component causing this could be Ans ; Nicotine 2. World ‘No Tobacco Day’ is observed on Ans ; May 31 3. Cancer cells are more easily damaged by radiations than normal

Science : Chapter 20 : Breeding and Biotechnology I. Choose the best answer 1. Which method of crop improvement can be practised by a farmer if he is inexperienced? Ans ; Mass selection 2. Pusa Komal is a disease resistant variety of __________. Ans ; Cow pea 3. Himgiri developed by hybridisation and selection for

Science : Chapter 19 : Origin and Evolution of Life I. Choose the best answer 1. Biogenetic law states that ______________ Ans ; Ontogeny recapitulates phylogeny 2. The ‘use and disuse theory’ was proposed by ______________. Ans ; Jean Baptiste Lamarck 3. Palaeontologist deal with Ans ; Fossil evidences 4. The best way of direct

Science : Chapter 18 : Heredity I. Choose the best answer 1. According to Mendel alleles have the following character Ans ; Responsible for character 2. 9 : 3 : 3 : 1 ratio is due to Ans ; Independent assortment 3. The region of the chromosome where the spindle fibres get attached during cell

Science : Chapter 17 : Reproduction in Plants and Animals I. Choose the best answer 1. The plant which propagates with the help of its leaves is __________. Ans ; Bryophyllum 2. Asexual reproduction takes place through budding in __________. Ans ; Yeast 3. Syngamy results in the formation of __________. Ans ; Zygote 4.

Science : Chapter 16 : Plant and Animal Hormones I. Choose the best answer 1. Gibberellins cause: Ans ; Elongation of dwarf plants 2. The hormone which has positive effect on apical dominance is: Ans ; Auxin 3. Which one of the following hormones is naturally not found in plants: Ans ; 2, 4–D 4. Avena

Science : Chapter 15 : Nervous System I. Choose the best answer 1. Bipolar neurons are found in Ans ; Retina of eye 2. Site for processing of vision, hearing, memory, speech, intelligence and thought is Ans ; Brain 3. In reflex action, the reflex arc is formed by Ans ; Receptor, spinal cord, muscle