Notes | EduRev

Science Class 9

Created by: Dr Manju Sen

Class 9 : Notes | EduRev

 Page 1


  
 
CBSE IX  |  SCIENCE 
Sample Paper – 7 
 
     
CBSE 
Class IX Science 
Sample Paper – 7 
Time: 3 hrs  Total Marks: 80 
 
General Instructions: 
• The question paper comprises five sections – A, B, C, D and E. You are to attempt all 
the sections. 
• All questions are compulsory. 
• Internal choice is given in sections B, C, D and E. 
• Question numbers 1 and 2 in Section A are one mark questions. They are to be 
answered in one word or in one sentence. 
• Question numbers 3 to 5 in Section B are two marks questions. These are to be 
answered in about 30 words each. 
• Question numbers 6 to 15 in Section C are three marks questions. These are to be 
answered in about 50 words each. 
• Question numbers 16 to 21 in Section D are five marks questions. These are to be 
answered in about 70 words each. 
• Question numbers 22 to 27 in Section E are based on practical skills. Each question 
is a two marks question. These are to be answered in brief. 
 
 
Section A 
 
1. Name two breeds of cows selected for long lactation period. (1) 
 
2. List the aspects involved in the cycling of nutrients. (1) 
 
Section B 
 
3. What makes the biosphere dynamic but a stable system?            (2) 
 
OR 
 
Define eutrophication. What is its ill-effect on the ecosystem? 
 
4. A ball weighing 15 N falls from a height of 30 metres. Calculate the energy it had when it 
was at rest. What is the form of energy it experiences once it reaches the ground?   
(consider g = 10 m/s
2
)                                                                   (2)                                         
 
5. Explain the sedimentation and decantation methods. 
Page 2


  
 
CBSE IX  |  SCIENCE 
Sample Paper – 7 
 
     
CBSE 
Class IX Science 
Sample Paper – 7 
Time: 3 hrs  Total Marks: 80 
 
General Instructions: 
• The question paper comprises five sections – A, B, C, D and E. You are to attempt all 
the sections. 
• All questions are compulsory. 
• Internal choice is given in sections B, C, D and E. 
• Question numbers 1 and 2 in Section A are one mark questions. They are to be 
answered in one word or in one sentence. 
• Question numbers 3 to 5 in Section B are two marks questions. These are to be 
answered in about 30 words each. 
• Question numbers 6 to 15 in Section C are three marks questions. These are to be 
answered in about 50 words each. 
• Question numbers 16 to 21 in Section D are five marks questions. These are to be 
answered in about 70 words each. 
• Question numbers 22 to 27 in Section E are based on practical skills. Each question 
is a two marks question. These are to be answered in brief. 
 
 
Section A 
 
1. Name two breeds of cows selected for long lactation period. (1) 
 
2. List the aspects involved in the cycling of nutrients. (1) 
 
Section B 
 
3. What makes the biosphere dynamic but a stable system?            (2) 
 
OR 
 
Define eutrophication. What is its ill-effect on the ecosystem? 
 
4. A ball weighing 15 N falls from a height of 30 metres. Calculate the energy it had when it 
was at rest. What is the form of energy it experiences once it reaches the ground?   
(consider g = 10 m/s
2
)                                                                   (2)                                         
 
5. Explain the sedimentation and decantation methods. 
  
 
CBSE IX  |  SCIENCE 
Sample Paper – 7 
 
     
Section C 
6.   (3) 
(a) Draw a sketch of Bohr's model of an atom with three shells. 
(b) If the K, L and M shells of an atom are full, then what would be the total number of     
electrons in the atom? 
(c) What is the maximum number of electrons which can be accommodated in a shell?  
     
7. Write the symptoms when the following organs are targeted by microbes. (3) 
(a) Lungs 
(b) Liver 
(c) Brain 
OR 
 
‘It is more difficult to make antiviral medicines than antibiotics’. Justify this statement.  
  
8. Give reasons:  (3) 
(a) Why should we wear cotton clothes in summer? 
(b) Why do we see water droplets on the outer surface of a glass containing ice-cold 
water? 
(c) How does it feel when a nurse applies spirit at the injection site?  
9. A stone is tied to a string and is continuously revolved in circular motion. What is the 
displacement of the stone? What is the work done if the force applied to revolve the 
stone is 30 N? (3) 
  
10.  Write the expression for Newton’s law of gravitation and give explanation of all the 
terms in the expression. What is the SI unit of the gravitational constant?   (3) 
 
11.  A metal plate of mass 30 kg and diameter 100 cm is placed on a stand. Calculate the 
pressure acting on the stand.  (3)  
OR 
 
Calculate the orbital velocity in unit km/s of the Earth around the Sun if the distance 
between the Earth and the Sun is ?
8
1.49 10 km. (Total time taken by the Earth for 
revolution??
7
3.15 10 seconds )                                                                           (3) 
   
12.  Calculate the ratio of moles of 3.6 g of water and 4.4 g of carbon dioxide. Atomic mass 
of C = 12 u, H = 1 u, O = 16 u.       (3)                                                                                                                                                                                      
OR 
 
Write the names of compounds:                                                                                                       
       (i) Al2(SO4)3 
Page 3


  
 
CBSE IX  |  SCIENCE 
Sample Paper – 7 
 
     
CBSE 
Class IX Science 
Sample Paper – 7 
Time: 3 hrs  Total Marks: 80 
 
General Instructions: 
• The question paper comprises five sections – A, B, C, D and E. You are to attempt all 
the sections. 
• All questions are compulsory. 
• Internal choice is given in sections B, C, D and E. 
• Question numbers 1 and 2 in Section A are one mark questions. They are to be 
answered in one word or in one sentence. 
• Question numbers 3 to 5 in Section B are two marks questions. These are to be 
answered in about 30 words each. 
• Question numbers 6 to 15 in Section C are three marks questions. These are to be 
answered in about 50 words each. 
• Question numbers 16 to 21 in Section D are five marks questions. These are to be 
answered in about 70 words each. 
• Question numbers 22 to 27 in Section E are based on practical skills. Each question 
is a two marks question. These are to be answered in brief. 
 
 
Section A 
 
1. Name two breeds of cows selected for long lactation period. (1) 
 
2. List the aspects involved in the cycling of nutrients. (1) 
 
Section B 
 
3. What makes the biosphere dynamic but a stable system?            (2) 
 
OR 
 
Define eutrophication. What is its ill-effect on the ecosystem? 
 
4. A ball weighing 15 N falls from a height of 30 metres. Calculate the energy it had when it 
was at rest. What is the form of energy it experiences once it reaches the ground?   
(consider g = 10 m/s
2
)                                                                   (2)                                         
 
5. Explain the sedimentation and decantation methods. 
  
 
CBSE IX  |  SCIENCE 
Sample Paper – 7 
 
     
Section C 
6.   (3) 
(a) Draw a sketch of Bohr's model of an atom with three shells. 
(b) If the K, L and M shells of an atom are full, then what would be the total number of     
electrons in the atom? 
(c) What is the maximum number of electrons which can be accommodated in a shell?  
     
7. Write the symptoms when the following organs are targeted by microbes. (3) 
(a) Lungs 
(b) Liver 
(c) Brain 
OR 
 
‘It is more difficult to make antiviral medicines than antibiotics’. Justify this statement.  
  
8. Give reasons:  (3) 
(a) Why should we wear cotton clothes in summer? 
(b) Why do we see water droplets on the outer surface of a glass containing ice-cold 
water? 
(c) How does it feel when a nurse applies spirit at the injection site?  
9. A stone is tied to a string and is continuously revolved in circular motion. What is the 
displacement of the stone? What is the work done if the force applied to revolve the 
stone is 30 N? (3) 
  
10.  Write the expression for Newton’s law of gravitation and give explanation of all the 
terms in the expression. What is the SI unit of the gravitational constant?   (3) 
 
11.  A metal plate of mass 30 kg and diameter 100 cm is placed on a stand. Calculate the 
pressure acting on the stand.  (3)  
OR 
 
Calculate the orbital velocity in unit km/s of the Earth around the Sun if the distance 
between the Earth and the Sun is ?
8
1.49 10 km. (Total time taken by the Earth for 
revolution??
7
3.15 10 seconds )                                                                           (3) 
   
12.  Calculate the ratio of moles of 3.6 g of water and 4.4 g of carbon dioxide. Atomic mass 
of C = 12 u, H = 1 u, O = 16 u.       (3)                                                                                                                                                                                      
OR 
 
Write the names of compounds:                                                                                                       
       (i) Al2(SO4)3 
  
 
CBSE IX  |  SCIENCE 
Sample Paper – 7 
 
     
(ii) CaCl2 
(iii) K2SO4 
 
13. Samar’s father owned an orchard in the Kashmir valley where apples grow in 
abundance. In the flowering season, Samar observed honeybees on the flowers. He 
quickly asked his father to start working on the idea of establishing an apiary. (3) 
(a) Name the species of honeybee which is commonly used in India for the commercial 
production of honey. 
(b) Write two advantages of bee keeping. 
(c) List two qualities of Samar which are worth praising. 
 
14. What would happen if all the cells of our body were of the same shape and size?  (3) 
 
15. Two similar plastic trays A and B filled with soil and manure are taken. In Tray A, 
mustard seeds are sown and watered for 4–5 days until they germinate into seedlings, 
and the seedlings grow into small plants. Watering of Tray A is stopped for the next 2–3 
days, and the small plants are allowed to grow. Trays A and B are placed on a brick in a 
tilted position as shown in the figure. Now both trays are watered with equal amount of 
water using a water can.  (3) 
 
 
 
Answer the questions given below: 
(a) Name the natural phenomenon indicated in Tray B. 
(b) Less water flows out from Tray A. Give reason. 
(c) Why is the top layer of soil considered the most important layer? 
 
 
 
 
 
Page 4


  
 
CBSE IX  |  SCIENCE 
Sample Paper – 7 
 
     
CBSE 
Class IX Science 
Sample Paper – 7 
Time: 3 hrs  Total Marks: 80 
 
General Instructions: 
• The question paper comprises five sections – A, B, C, D and E. You are to attempt all 
the sections. 
• All questions are compulsory. 
• Internal choice is given in sections B, C, D and E. 
• Question numbers 1 and 2 in Section A are one mark questions. They are to be 
answered in one word or in one sentence. 
• Question numbers 3 to 5 in Section B are two marks questions. These are to be 
answered in about 30 words each. 
• Question numbers 6 to 15 in Section C are three marks questions. These are to be 
answered in about 50 words each. 
• Question numbers 16 to 21 in Section D are five marks questions. These are to be 
answered in about 70 words each. 
• Question numbers 22 to 27 in Section E are based on practical skills. Each question 
is a two marks question. These are to be answered in brief. 
 
 
Section A 
 
1. Name two breeds of cows selected for long lactation period. (1) 
 
2. List the aspects involved in the cycling of nutrients. (1) 
 
Section B 
 
3. What makes the biosphere dynamic but a stable system?            (2) 
 
OR 
 
Define eutrophication. What is its ill-effect on the ecosystem? 
 
4. A ball weighing 15 N falls from a height of 30 metres. Calculate the energy it had when it 
was at rest. What is the form of energy it experiences once it reaches the ground?   
(consider g = 10 m/s
2
)                                                                   (2)                                         
 
5. Explain the sedimentation and decantation methods. 
  
 
CBSE IX  |  SCIENCE 
Sample Paper – 7 
 
     
Section C 
6.   (3) 
(a) Draw a sketch of Bohr's model of an atom with three shells. 
(b) If the K, L and M shells of an atom are full, then what would be the total number of     
electrons in the atom? 
(c) What is the maximum number of electrons which can be accommodated in a shell?  
     
7. Write the symptoms when the following organs are targeted by microbes. (3) 
(a) Lungs 
(b) Liver 
(c) Brain 
OR 
 
‘It is more difficult to make antiviral medicines than antibiotics’. Justify this statement.  
  
8. Give reasons:  (3) 
(a) Why should we wear cotton clothes in summer? 
(b) Why do we see water droplets on the outer surface of a glass containing ice-cold 
water? 
(c) How does it feel when a nurse applies spirit at the injection site?  
9. A stone is tied to a string and is continuously revolved in circular motion. What is the 
displacement of the stone? What is the work done if the force applied to revolve the 
stone is 30 N? (3) 
  
10.  Write the expression for Newton’s law of gravitation and give explanation of all the 
terms in the expression. What is the SI unit of the gravitational constant?   (3) 
 
11.  A metal plate of mass 30 kg and diameter 100 cm is placed on a stand. Calculate the 
pressure acting on the stand.  (3)  
OR 
 
Calculate the orbital velocity in unit km/s of the Earth around the Sun if the distance 
between the Earth and the Sun is ?
8
1.49 10 km. (Total time taken by the Earth for 
revolution??
7
3.15 10 seconds )                                                                           (3) 
   
12.  Calculate the ratio of moles of 3.6 g of water and 4.4 g of carbon dioxide. Atomic mass 
of C = 12 u, H = 1 u, O = 16 u.       (3)                                                                                                                                                                                      
OR 
 
Write the names of compounds:                                                                                                       
       (i) Al2(SO4)3 
  
 
CBSE IX  |  SCIENCE 
Sample Paper – 7 
 
     
(ii) CaCl2 
(iii) K2SO4 
 
13. Samar’s father owned an orchard in the Kashmir valley where apples grow in 
abundance. In the flowering season, Samar observed honeybees on the flowers. He 
quickly asked his father to start working on the idea of establishing an apiary. (3) 
(a) Name the species of honeybee which is commonly used in India for the commercial 
production of honey. 
(b) Write two advantages of bee keeping. 
(c) List two qualities of Samar which are worth praising. 
 
14. What would happen if all the cells of our body were of the same shape and size?  (3) 
 
15. Two similar plastic trays A and B filled with soil and manure are taken. In Tray A, 
mustard seeds are sown and watered for 4–5 days until they germinate into seedlings, 
and the seedlings grow into small plants. Watering of Tray A is stopped for the next 2–3 
days, and the small plants are allowed to grow. Trays A and B are placed on a brick in a 
tilted position as shown in the figure. Now both trays are watered with equal amount of 
water using a water can.  (3) 
 
 
 
Answer the questions given below: 
(a) Name the natural phenomenon indicated in Tray B. 
(b) Less water flows out from Tray A. Give reason. 
(c) Why is the top layer of soil considered the most important layer? 
 
 
 
 
 
  
 
CBSE IX  |  SCIENCE 
Sample Paper – 7 
 
     
Section D 
16.                       (5) 
(a) Give two examples of each:                                              
(i) Organisms with a soft body covered with a calcareous shell. 
(ii) Organisms with jointed legs and no wings. 
(iii) Organisms with a spiny body and radial symmetry. 
(b) Classify the following into cold-blooded and warm-blooded animals:           
Rohu, Bat, Pigeon, Salamander 
17.   (5) 
(a) A man pulls a trolley through a distance of 20 metres on a smooth horizontal 
surface. The handle of the trolley makes an angle of 30° with the horizontal surface. If 
the force applied by the man is 30 N, then calculate the work done in pulling the trolley. 
(Given: 3 1.732 ? )  
(b) Define power. Is power a scalar or vector quantity? 
 
OR 
 
(a) What is the amount of work done: 
i. By an electron revolving in a circular orbit of radius ‘r’ around a nucleus? 
ii. By an electron moving with half the speed of light in an empty space free of all 
forces? 
(b) An electronic pump is used to pump water from an underground sump to the 
overhead tank situated 20 m above. It transfers 2000 kg of water to the overhead 
tank in 15 minutes. Calculate the power of the pump. 
What do you mean by instantaneous power of a device?          
 
18.   
(a) Which metal did Rutherford select for his a particle scattering experiment and why? 
(b) Which part of atom was discovered   (5) 
 
OR 
 
(a)  Describe Rutherford's model of an atom.  
(b)  Write the electronic configuration of the elements whose atomic numbers 
correspond to 7 and 19.  
 
19.                     (5)                                         
(a) An object weighs 40 N on the Earth. What will be its weight on the Moon? Calculate 
the mass of this object on the Moon. (g = 10 m/s
2
)                    
(b) A man is standing 30 metres away from a large wall and calls his friend and hears an 
echo. After what time does he hear an echo?  (Speed of sound in air = 330 m/s)      
 
Page 5


  
 
CBSE IX  |  SCIENCE 
Sample Paper – 7 
 
     
CBSE 
Class IX Science 
Sample Paper – 7 
Time: 3 hrs  Total Marks: 80 
 
General Instructions: 
• The question paper comprises five sections – A, B, C, D and E. You are to attempt all 
the sections. 
• All questions are compulsory. 
• Internal choice is given in sections B, C, D and E. 
• Question numbers 1 and 2 in Section A are one mark questions. They are to be 
answered in one word or in one sentence. 
• Question numbers 3 to 5 in Section B are two marks questions. These are to be 
answered in about 30 words each. 
• Question numbers 6 to 15 in Section C are three marks questions. These are to be 
answered in about 50 words each. 
• Question numbers 16 to 21 in Section D are five marks questions. These are to be 
answered in about 70 words each. 
• Question numbers 22 to 27 in Section E are based on practical skills. Each question 
is a two marks question. These are to be answered in brief. 
 
 
Section A 
 
1. Name two breeds of cows selected for long lactation period. (1) 
 
2. List the aspects involved in the cycling of nutrients. (1) 
 
Section B 
 
3. What makes the biosphere dynamic but a stable system?            (2) 
 
OR 
 
Define eutrophication. What is its ill-effect on the ecosystem? 
 
4. A ball weighing 15 N falls from a height of 30 metres. Calculate the energy it had when it 
was at rest. What is the form of energy it experiences once it reaches the ground?   
(consider g = 10 m/s
2
)                                                                   (2)                                         
 
5. Explain the sedimentation and decantation methods. 
  
 
CBSE IX  |  SCIENCE 
Sample Paper – 7 
 
     
Section C 
6.   (3) 
(a) Draw a sketch of Bohr's model of an atom with three shells. 
(b) If the K, L and M shells of an atom are full, then what would be the total number of     
electrons in the atom? 
(c) What is the maximum number of electrons which can be accommodated in a shell?  
     
7. Write the symptoms when the following organs are targeted by microbes. (3) 
(a) Lungs 
(b) Liver 
(c) Brain 
OR 
 
‘It is more difficult to make antiviral medicines than antibiotics’. Justify this statement.  
  
8. Give reasons:  (3) 
(a) Why should we wear cotton clothes in summer? 
(b) Why do we see water droplets on the outer surface of a glass containing ice-cold 
water? 
(c) How does it feel when a nurse applies spirit at the injection site?  
9. A stone is tied to a string and is continuously revolved in circular motion. What is the 
displacement of the stone? What is the work done if the force applied to revolve the 
stone is 30 N? (3) 
  
10.  Write the expression for Newton’s law of gravitation and give explanation of all the 
terms in the expression. What is the SI unit of the gravitational constant?   (3) 
 
11.  A metal plate of mass 30 kg and diameter 100 cm is placed on a stand. Calculate the 
pressure acting on the stand.  (3)  
OR 
 
Calculate the orbital velocity in unit km/s of the Earth around the Sun if the distance 
between the Earth and the Sun is ?
8
1.49 10 km. (Total time taken by the Earth for 
revolution??
7
3.15 10 seconds )                                                                           (3) 
   
12.  Calculate the ratio of moles of 3.6 g of water and 4.4 g of carbon dioxide. Atomic mass 
of C = 12 u, H = 1 u, O = 16 u.       (3)                                                                                                                                                                                      
OR 
 
Write the names of compounds:                                                                                                       
       (i) Al2(SO4)3 
  
 
CBSE IX  |  SCIENCE 
Sample Paper – 7 
 
     
(ii) CaCl2 
(iii) K2SO4 
 
13. Samar’s father owned an orchard in the Kashmir valley where apples grow in 
abundance. In the flowering season, Samar observed honeybees on the flowers. He 
quickly asked his father to start working on the idea of establishing an apiary. (3) 
(a) Name the species of honeybee which is commonly used in India for the commercial 
production of honey. 
(b) Write two advantages of bee keeping. 
(c) List two qualities of Samar which are worth praising. 
 
14. What would happen if all the cells of our body were of the same shape and size?  (3) 
 
15. Two similar plastic trays A and B filled with soil and manure are taken. In Tray A, 
mustard seeds are sown and watered for 4–5 days until they germinate into seedlings, 
and the seedlings grow into small plants. Watering of Tray A is stopped for the next 2–3 
days, and the small plants are allowed to grow. Trays A and B are placed on a brick in a 
tilted position as shown in the figure. Now both trays are watered with equal amount of 
water using a water can.  (3) 
 
 
 
Answer the questions given below: 
(a) Name the natural phenomenon indicated in Tray B. 
(b) Less water flows out from Tray A. Give reason. 
(c) Why is the top layer of soil considered the most important layer? 
 
 
 
 
 
  
 
CBSE IX  |  SCIENCE 
Sample Paper – 7 
 
     
Section D 
16.                       (5) 
(a) Give two examples of each:                                              
(i) Organisms with a soft body covered with a calcareous shell. 
(ii) Organisms with jointed legs and no wings. 
(iii) Organisms with a spiny body and radial symmetry. 
(b) Classify the following into cold-blooded and warm-blooded animals:           
Rohu, Bat, Pigeon, Salamander 
17.   (5) 
(a) A man pulls a trolley through a distance of 20 metres on a smooth horizontal 
surface. The handle of the trolley makes an angle of 30° with the horizontal surface. If 
the force applied by the man is 30 N, then calculate the work done in pulling the trolley. 
(Given: 3 1.732 ? )  
(b) Define power. Is power a scalar or vector quantity? 
 
OR 
 
(a) What is the amount of work done: 
i. By an electron revolving in a circular orbit of radius ‘r’ around a nucleus? 
ii. By an electron moving with half the speed of light in an empty space free of all 
forces? 
(b) An electronic pump is used to pump water from an underground sump to the 
overhead tank situated 20 m above. It transfers 2000 kg of water to the overhead 
tank in 15 minutes. Calculate the power of the pump. 
What do you mean by instantaneous power of a device?          
 
18.   
(a) Which metal did Rutherford select for his a particle scattering experiment and why? 
(b) Which part of atom was discovered   (5) 
 
OR 
 
(a)  Describe Rutherford's model of an atom.  
(b)  Write the electronic configuration of the elements whose atomic numbers 
correspond to 7 and 19.  
 
19.                     (5)                                         
(a) An object weighs 40 N on the Earth. What will be its weight on the Moon? Calculate 
the mass of this object on the Moon. (g = 10 m/s
2
)                    
(b) A man is standing 30 metres away from a large wall and calls his friend and hears an 
echo. After what time does he hear an echo?  (Speed of sound in air = 330 m/s)      
 
  
 
CBSE IX  |  SCIENCE 
Sample Paper – 7 
 
     
20.   (5)                                         
(a) Explain how the bark of a tree is formed. How does it act as protective tissue? 
(b) What will happen if all the blood platelets are removed from blood?  
 
OR  
 
(a) Give the location and function of the following tissues: 
(i) Cartilage 
(ii) Areolar tissue 
(iii) Adipose tissue 
(b) Name the tissue which shows the following features: 
(i) Cells are dead; cells show thickening; provides mechanical support to plants; 
made up of one type of cells. 
(ii) Cells are living; cells contain green-coloured chloroplast; possess intercellular 
spaces. 
 
21.       (5) 
(a) What happens when a liquid is left exposed to air? 
(b) List the factors which affect the rate of evaporation and explain their effect on it.                                                                                                                               
  
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