Class 9 Sample Paper 2022 Solution Science Term 2

suggestive answers of Practice Paper, term II-2021-22 Class – IX Science (Code: 086) Maximum Marks: 40 Time: 2 hours SECTION – A प्र. स. अंक Q. No. Marks 1 a. Acute 2 b. diabetes, tuberculosis etc. 2 Earth is not a sphere it is ellipsoid. Value of ‘g’ is comparative more at poles 2 and less on equator of the planet earth. 3 a. 11N (calculation is required) 2 b. mass of an object remain constant irrespective of place, it will not change. Or a. v=u+at ; 20m/s b. s=1/2at2 ; 20m (correct calculation is required) 4 Economic stability, public hygiene etc. (any other correct response) 2 Or doctor diagnoses the disease in a diseased person by observing disease sign and symptoms (elaboration is required) 5 Proton,neutron,electron. (any two with correct charge) 2 6 F ; e=9 ;n=10 2 7 X=2,4 ;valency=4 ; y= 2,8,7 ; valency =1 2 SECTION – B 8 a. muscular energy- potential energy- kinetic energy. 3 b. 15foot= 4.5m p=mgh ; p=40x10x4.5m=1800J Or 36km/h=10m/s; 72km/h=20m/s Initial KE=1/2mv2 =50,000 J ; final KE=1/2mv2 =200,000 J Work done = change in KE =2,00,000-50,000=1,50,000J 9 a. Every particle attracts every other particle in the universe with a force that 3 is directly proportional to the product of the masses and inversely proportional to the square of the distance between them. The importance of universal law of gravitation is that it explains the motion docs. of planets around the sun; the motion of moon around the earth; and the motion of artificial satellites around the earth. It also explains the phenomena of rainfall, snowfall, and flow of water in rivers on the earth.

b. ’G ’ universal gravitation constant and ‘g’ stands for acceleration due to gravity. 10 a. Aluminium hydroxide=Al(OH)3 and sNaCl 3 b. i. Aluminium oxide Al2O3 ii. Magnesium oxide MgO 11 a. C6H12O6 = 6X12u+12x1+6x16= 180u 3 b. 6.022X1023 (I mole) atom in 12g of C-12 12 Ion are charge particles.any atom or group of atoms that bears one or more 3 positive or negative electrical charges.. Positively charged ions are called cations; negatively charged ions, anions. cation =Na+ and anion=Cl_. 13 a. element having same atomic number but different mass number. correct 3 application of isotopes. b. Mg, 2,8,2 SECTION – C 14 a. electrical energy –light energy. 4 b. Any two measures to save electricity. c. Tubelight 40W =.04kW; water pump=120W=.120kW Electricity consume by tubelight per day =4x.04kwx8h = 1.28kWh Electricity consume by TV per day =1x.120kwx6h = 0.72kWh Electricity consume bywater pump per day =1kwx1h = 1kWh Total electricity consume per day in the house=3kWh or 3 units Total electricity consume in the month of march=3kwh x31=93kWh or 93 units Bill for the month or march @ 3.00Rs per unit will be=93unit x3=279 Rs. Or P=1kW =1000W ;h=10m,g=10m/s2 ;t=1min =60s P=w/t =mgh/t Mass of water = (Pxt)/gh =600kg. 15 a. rabies. rabies is caused by a virus. 4 b. Vectors are living organisms that can transmit infectious pathogens between humans, or from animals to humans. Rabies, dengue, chicken guinea etc. c. Vaccine is a biological substance designed to protect humans from infections caused by bacteria and viruses . They help the individual to build his immunity against specific diseases. These vaccines will help the body to produce the antibody which fight against the diseases causing pathogen and save the life of the individual. Or As the disease affects the body, the functioning of body organs can be a concern, and medication needs which can cause side effects including allergies. There are certain diseases that can not be treated so the prevention docs. is better than cure.