SCIENCE IX

 

Holidays home work class 9 science

1.    Prepared a science magazine as art integrated project.

2.    Complete the following worksheet in your class work copy.

Matter in our surrounding

MCQ

  1.CO₂ can be easily liquified and even solidified because

(a)     It has weak forces of attraction

(b)     It has comparatively more force of attraction than other gases       (c)   It has more intermolecular space       (d)   It is present in atmosphere.

2.      Which of the following has heighest kinetic energy?

(a)     Particles of ice at 0 °C

(b)     Particles of water at 0 °C

(c)     Particles of water at 100 °C

(d)     Particles of steam at 100 °C

3.      Bose-Einstein Condensate have

(a)     Very low kinetic energy

(b)     Low kinetic energy

(c)     High kinetic energy (d)   Highest kinetic energy.

4.      Which of the following is most suitable for summer?

(a)     Cotton

(b)     Nylon

(c)     Polyester (d)   Silk.

5.      Which of the following is incorrect about plasma?

(a)     Fluorescent tube and neon sign bulbs consist of plasma.

(b)     The gas gets ionised when electrical energy flows through it.

(c)     It consists of super-energetic and super-excited particles.

(d)     The plasma glows with colour which does not depend upon nature of gas.

6.      The colour of vapours formed on sublimation of iodine solid is

(a)     Purple (violet)

(b)     Colourless

(c)     Yellow

(d)     Orange

7.      Under which of the following conditions we can boil water at room temperature?

(a)     At low pressure

(b)     At high pressure

(c)     At very high pressure

(d)     At atmospheric pressure

8.      Which of the following is not endothermic process?

(a)     Fusion

(b)     Vapourisation

(c)     Temperature

(d)     Insoluble heavy impurities

9.      Which of the following does not affect rate of evaporation?

(a)     Wind speed

(b)     Surface area

(c)     Temperature

(d)     Insoluble heavy impurities

10.   Kinetic energy of molecules is directly proportional to

(a)     Temperature

(b)     Pressure

(c)     Both (a) and (b)

(d)     Atmospheric pressure

 

1.      Why do we see water droplets collected on the outer surface of a glass container, containing ice?

2.      Explain why solids have fixed shape but liquids and gases do not have fixed shape.

3.      Why is it advisable to use pressure cooker at higher altitudes?

4.      What are fluids?

5.      Why is water liquid at room temperature?

6.      Cotton is solid but it floats on water. Why?

7.      Why are solids generally denser than liquids and gases?

8.      Name the factors that affect evaporation.

9.      How is the high compressibility property of gas useful to us?

10.   With the help of an example, explain how diffusion of gases in water is essential?

11.   On a hot sunny day, why do people sprinkle water on the roof or open ground?

12.   Why to people perspire a lot on a hot humid day?

13.   A balloon when kept in sun, bursts after some time. Why?

14.   Pressure and temperature determine the state of a substance. Explain this in detail.

15.   Explain giving examples the various factors on which rate of evaporation depends.

Assertion and Reason  

1.) ASSERTION-Sugar and Salt both are easily dissolved in water.

               REASON         – Sugar and Salt are solid hence it is easily dissolved in water.

a.)  Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

b.)  Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion. c.) Assertion is true but Reason is false.

d.) Both Assertion and Reason are false.

ANS-Assertion is true but Reason is false.

2.) ASSERTION-When sugar pour in water, then taste of water became a sweet.

Reason-sugar completely dissolved in water with giving its own character.

3.  ASSERTION-ice  floats on water.

REASON-ice is solid in nature

4.  ASSERION-Dilution of any colored compound in water shows light color than original color of compound.) ( hint- potassium permanganate dissolve in water)

REASON-when dilution is done by water the quantity of particle getting decreases by dilution hence it shows light color.

5.ASSERTION- Particles in liquid state shows motion.

REASON-It possess kinetic energy

6. ASSERTION-Particles of matter held together by making any state.

REASON-intermixing of particles of two different type of matter on there own is called diffusion.

 

CELL THE FUNDAMENTAL UNIT OF LIFE

 

Colourless plastids are known as

(a)     Chromoplasts

(b)     Chloroplasts

(c)     Leucoplasts

(d)     Protoplast

2.   Animal cell lacking nuclei would also lack in

(a)     Ribosome

(b)     Lysosome

(c)     Endoplasmic reticulum

(d)     Chromosome

3.   The phenomenon by which protoplast of a cell shrinks from the wall is

(a)     Osmosis

(b)     Plasmolysis

(c)     Diffusion

(d)     Glycolysis

4.   Which of the following are examples of prokaryotes?

(a)     Algae

(b)     Fungi

(c)     Bacteria

(d)     Protozoa

5.   The barrier between the protoplasm and the outer environment in an animal cell is

(a)     Cell wall

(b)     Plasma membrane

(c)     Nuclear membrane

(d)     Cytoplasm

6.   Ribosomes are the site of

(a)     Photosynthesis

(b)     Respiration

(c)     Protein synthesis

(d)     Absorption

7.   Which is the largest cell organelle present in plant cell?

(a)     Nucleus

(b)     Chloroplast

(c)     Endoplasmic reticulum

(d)     Mitochondria

1.      What is cell theory? Who formulated it?

2.      Write the full form of DNA and ATP.

3.      What is the importance of nucleus?

4.      Explain the process of osmosis through an example.

5.      Draw and label a Plant cell neatly.

6.      Why is Plasma Membrane a selectively permeable membrane?

7.      What is the function of chromosome?

8.      Name the cleansing organelle in the cell.

9.      Explain the process of osmosis and give an example. 

10.    What are the functions of plastids? 

11.    Explain the difference between Prokaryotic cell and Eukaryotic cell  12.  What are genes? What is the difference between genes and chromosomes? 

13.    Why are lysosomes called suicidal bags? 

14.    Draw a neat diagram of a plant cell.

15.    Write a short note on Plasma Membrane. 

16.    Why is the inner membrane of Mitochondria folded? 

17.    Name the smallest and the longest cell in human body. 

18.    Define nucleoids. 

 

1. ASSERTION-All plants and animals are composed of cells. REASON-Plants and animals made up of DNA.

2.ASSERTION-All plants and animals are composed of cells. REASON-Cell is the basic unit of life.

 

3.ASSERTION-All non-living things composed of cells. REASON-Cell is the basic unit of non- living things.

4.ASSERTION-All plants and animals are composed of cells. REASON-Cell is the basic unit of non-living things.

5. ASSERTION-Some cells like amoeba have changing shapes.

REASON-Unicellular organisms show change in their structure.

6.ASSERTION-Some cells like amoeba have changing shapes.

REASON-Prokaryotic cells born with some specific character like change of shape.

7.ASSERTION-Plasma membrane is present outside the cell

REASON-Plasma membrane protects the cell and separates the contents of the cell from its external environment.