matter around us

CBSE SCIENCE CLASS IX [states of matter] Q1Maximum number of states of matter is a. Three b.Two c.Four d.Five Q2.The constituent particles have vibratory motion in a. Solids b.Liquids c.Gases d.All Q3.The most abundant element in earth’ crust is a. Iron b.Oxygen c Silica d.Nitrogen Q4.Which of the following is not a matter a. Dust b.Fog c.Humidity d. Feeling hot Q5.10 degree is equal to a. 163 K b.10k c.183k d.283k Q5Solids can not be compressed a. Constituent particles are very closely packed. b. Inter particle attraction is weak c. Movement of constituted particles is restricted. d. Constituent particles diffuse very fast. Q6.S I unit of temperature is a. Celsius b.Kelvin c.Fahrenhight d. All. Q7When the liquid starts boiling, the heat energy supplied is a. Lost to the surroundings b. Increases temperature of liquid c Increases kinetic energy of liquids d. Is absorbed as latent heat of the liquid particles. Q8.The force of attraction is maximum in a. Dry air b.Petrol c.Glycerine d. Iron rod Q9.The compound which does not undergo sublimation a. Ammonium chloride b.Iodine c. Sodium chloride d.Camphor Q10Which of the following is not an element a. Ozone b.Nitrogen c.Gold d.Diamond Q11.The standard room temperature is taken as a. 20 degree Celsius b.298K c. 398 k d .O degree Celsius. Q12.An example of pure substance is A.Iodised salt b.Petrol c. C.N.G. d. Distilled water Q13.At higher altitude the boiling point of water decreases because a. The temperature of liquid falls. b. The temperature of liquid increases. c. The temperature of liquid does not change. d. The pressure of surroundings increases. Q14.Molten sodium chloride conducts electricity due to the presence of a. Free electrons b. Free molecules c. Atoms of Sodium & chlorine d Free ions. Q15.Pressure cooker decreases cooking time because a. The higher pressure makes food soft. b. The boiling point of the water increases. c. The heat is uniformly distributed. d. More heat is provided. Q16.CNG stands for a. Carbon dioxide & Nitrogen b. Compressed nitrogen gas c. Compressed natural gas d. Compressed neutral gas. Q17. Fluids are a.Solids& gases b.Liquids & gases c Solids & gases d.Solds &gases Q18.The changing of solid directly in to gas without changing in to liquids is called a.Evaporation b.Sublimation c.Diffusion D.Condesation Q19.The mixing of one substance with other due to motion of its particles is called a.Diffusion b. sublimation c.Melting d.Boiling Q20.Kinetic energy of molecules is maximum in a.Solid b.Liquid c.Air d.Ice Q21The factors responsible for change in state of solid carbon dioxide in to vapours are a.decrease in pressure &increase in temperature b. Decrease in pressure c. Decrease in temperature d None of these. Q22.During evaporation of liquid a. The temperature of liquid falls b. The temperature of liquid the liquid rises c. The temperature of liquid does not change d. The temperature of liquid first rises & than falls. Q23.Rate of evaporation depends on a.Temperature b. Surface area c.Humidity d .All of the above. Q24.Pressure of air at sea level is a. 1 atmosphere b. 76 cm c.760mm d. All are correct. Q25.In summer we prefer wearing a. White cotton clothes b. White silk clothes c. White nylon clothes d .Dark silk clothes. ANSWERS Q1.d Q2.a Q3.b Q4.d Q5.d Q6.b Q7.b Q8.d Q9.c Q10a. Q11.b Q12.d Q13.a Q14.d Q15.b Q16.b Q17.b Q18.c Q19.a Q20.c Q21.a Q22.a Q23d. Q24.d Q25.a