Class IX science PWT -1 question paper sample

CHEMISTRY 13 MARKS

Case-Based Questions (QN 1-4) ​4

Rohan was observing his mother making tea. He noticed that when sugar was added to the hot milk, it dissolved quickly even without stirring. He also observed that the aroma of the hot tea spread throughout the room.

1. What characteristic of particles of matter allows sugar to dissolve in milk?

2. What phenomenon is responsible for the aroma of hot tea spreading in the room?

3. Name one factor that affects the rate of this phenomenon.

4. If the tea was cold, would the sugar dissolve faster or slower?

5. Explain why a gas can be easily compressed but a solid cannot.​​​​2

6. Describe an activity to show that particles of matter have spaces between them.​2

7. Convert the following temperatures: 2

a) 300 K to Celsius scale 

b) 50°C to Fahrenheit scale  

8. Explain the relationship between density, mass, and volume. A metal block has a mass of 150 kg and a volume of 0.05 m³. Calculate the density of the metal.​3

Biology 14 MARKS

9. The nucleus of the cell was discovered by-

(a) Robert Hooke    (b)  Robert Cook      

(c) Robert Brown   (d) Lueenhooke        [1]

10. The substance present in cell wall of plant and fungi cells are-

(a) Protein and Lipid respectively            

(b) Cellulose and Chitin respectively

(c)Chitin and Cellulose respectively       

(d) Cellulose and Pepditoglycan respectively​  [1]

11. The plasma membrane of a cell is 

(a) Impermeable         

(b) Permeable   

(c) Semi permeable  

(d) None of these         ​​[1]

12. consists of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:​​​​​​​​1

(a) Both A and R are true and R is the correct explanation of A.

b) Both A and R are true but R is not the correct explanation of A.​

(c) A is true but R is false

​(d) A is false but R is true

Assertion: The cell is structural unit of life.

Reason: Cell is smallest unit  capable of performing all the functions necessary for life.

13. Why do cells of multicellular organisms attain various shapes and sizes?                                   [2]

14. Who first proposed cell theory ? Who modified it? State the cell theory statement.                     [3]

15..The diagram of plant cell is given below. Study the structure and answer the question follows