Ncert – class 9- science – Chapter 1 – Matter in Our Surroundings 2 Welcome to your Ncert - class 9- science - Chapter 1 – Matter in Our Surroundings 2 1. If normal ice had been kept in place of the dry ice, and the mixture had been exposed to room temperature for a few minutes, then it would result in the heating up of the mixture melting of ice sublimation of ice dissolution of the marble powder None 2. Use the following information to answer the below question.Martha mixed some marble powder with dry ice. On keeping the mixture in the open air for a few minutes, the dry ice vanished and only the dry powder was left behind.The dry ice vanished because of evaporation condensation sublimation freezing None 3. Why does perspiration leave a cooling effect on our body? The sweat particles absorb heat from the body and get converted into vapour, thereby reducing its temperature None of the above The sweat particles absorb energy from the body and get converted into vapour, thereby increasing the temperature. The sweat particles release energy into the atmosphere and the temperature of the surroundings decrease. None 4. What is the effect of pressure on gas Volume of gas increases with increase in pressure Pressure has no effect on gas Both a and b Volume of gas decreases with increase in pressure None 5. Based on the statements given below, choose the correct answer. P: Some sugar can be added to a glass full of water without causing an overflow.Q: Liquids have spaces present between the molecules. Only Q is true P and Q are true but Q does not explain P Only P is true P and Q are true and Q explains P None 6. Which of the following represents true statement(s)? Both of the above It is easy to change shape of solids as they are highly compressible. Solids will not break under force. None of the above None 7. On heating, temperature _______, particles __________energy, intermolecular space ___________ and force of attraction ____________ falls, lose, increases, decreases rises, gain, decreases, increases rises, gain, increases, decreases falls, lose, decreases, increases None 8. What is the order of the three states of matter when they are arranged in the decreasing order of the compressibility of their molecules? Liquid → Solid → Gas Gas → Solid → Liquid Liquid → Gas → Solid Gas → Liquid → Solid None 9. Which of the following is not a property of particles of matter? The particles of matter are extremely small. The particles of matter attract each other The particles of matter have spaces between them The particles of matter are in stationary state None 10. A liquid can change its shape easily. This can be attributed to which of the following fact. Either A or C Non existing intermolecular forces. Strong intermolecular forces. Weak intermolecular forces. None 11. While mixing sugar with water, the level of water does not increase because _____________. None of the above tiny particles of sugar adjust among the space between tiny particles of water tiny particles of sugar destroy large particles of water matter has large particles which destroy water particles None 12. Evaporation that occurs directly from the solid phase below the melting point is called as: distillation condensation None of above Sublimation None 13. Which one of the following statements related to the process of evaporation is incorrect? Evaporation takes place within the liquid not on the surface. Temperature may change during evaporation. No bubbles are formed in the liquid during evaporation. Evaporation occurs at any temperature. None 14. The smell of the deodorant sprayed on one side of the room travels to the other side of the room. This proves that: particles of matter attract each other particles of matter are continuously moving None of the above particles of matter have space None 15. Select the characteristics of particles of matter. All of these The particles of matter are continuously moving about their mean position The particles of matter attract each other There is space between the particles of matter None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
