Rajesh

Samacheer Book Back Questions And Answers For Science Standard 9 “Periodic Classification of Elements“ I. Choose the correct answer:1. If Dobereiner is related with ‘law of triads’, then Newlands is related with(a) Modem periodic law(b) Hund’s rule(c) Law of octaves(d)…

Samacheer Book Back Questions And Answers For Science Standard 9 “Atomic Structure“ I. Choose the correct answer:1. Among the following the odd pair is(a) 188O, 199F(b) 4018Ar, 147N(c) 3014Si, 3115P(d) 4020Cr, 3919K 2. Change in the number of neutrons in…

Samacheer Book Back Questions And Answers For Science Standard 9 “Matter Around Us“ I. Choose the correct answer:1. The separation of denser particles from lighter particles done by rotation at high speed is called _____.(a) Filtration(b) sedimentation(c) decantation(d) centrifugation 2.…

Samacheer Book Back Questions And Answers For Science Standard 9 “Universe“ I. Choose the correct answer: 1. Who proposed the heliocentric model of the universe? (a) Tycho Brahe (b) Nicolaus Copernicus (c) Ptolemy (d) Archimedes 2. Which of the following…

Samacheer Book Back Questions And Answers For Science Standard 9 “Sound“ I. Choose the correct answer: 1. Which of the following vibrates when a musical note is produced by the cymbals in a orchestra? (a) stretched strings (b) stretched membranes…

Samacheer Book Back Questions And Answers For Science Standard 9 “Heat“ I. Choose the correct answer: 1. Calorie is the unit of (a) heat (b) work (c) temperature (d) food 2. SI unit of temperature is (a) Fahrenheit (b) joule…

Samacheer Book Back Questions And Answers For Science Standard 9 “Light“ I. Choose the correct answer: 1. A ray of light passes from one medium to another medium. Refraction takes place when angle of incidence is (a) 0° (b) 45°…

Samacheer Book Back Questions And Answers For Science Standard 9 “Magnetism and Electromagnetism“ I. Choose the correct answer:1. Which of the following converts electrical energy into mechanical energy?(a) Motor(b) Battery(c) Generator(d) Switch 2. Transformer works on _____.(a) AC only(b) DC…

Samacheer Book Back Questions And Answers For Science Standard 9 “Electric Charge And Electric Current“ I. Choose the correct answer: 1. In current electricity, a positive charge refers to, (a) presence of electron (b) presence of proton (c) absence of…

Samacheer Book Back Questions And Answers For Science Standard 9 “Fluids“ I. Choose the correct answer: 1. The size of an air bubble rising up in water (a) decreases (b) increases (c) remains same (d) may increase or decrease 2.…