Class 9 Science: Solutions of Sample Practice Question Paper- 10 PDF Download

 Page 1


  
 
CBSE IX | SCIENCE 
Sample Paper – 10 Solution 
 
         
CBSE  
Class IX Science 
Sample Paper – 10 Solution  
 
Section A 
1. Nitrogen compounds obtained by industrial fixation: 
? Ammonia 
? Urea 
 
2. Desirable traits for fodder crops: 
? Tallness 
? Profuse branching 
 
Section B 
3. Iron forms two types of ions, Fe
2+
 and Fe
3+
. 
The Fe
2+
 ion is known as iron (II) ion or ferrous ion and has valency of +2. The 
Fe
3+
 ion is known as iron (III) ion or ferric ion and it has a valency of +3. 
 
4. Here, the speed of sound, v = 330 m; time, t = 3 s 
Because the total distance covered by sound is two times the distance between the 
gunman and the cliff d, we have 
?
?
?
?
??
vt
d
2
330 m / s 3 s
 
2
d 495 m
 
5.  
(a) Striated muscles are under the control of one’s own will or volition. Hence, they 
are called voluntary muscles.  
(b) They are attached to the bones of the body. Therefore, they are mostly called 
skeletal muscles. 
OR 
 
The husk of coconut is made of sclerenchymatous tissue. The complex polymer lignin 
hardens the cell wall and is responsible for the stiffness of the sclerenchyma tissue. 
 
  
Page 2


  
 
CBSE IX | SCIENCE 
Sample Paper – 10 Solution 
 
         
CBSE  
Class IX Science 
Sample Paper – 10 Solution  
 
Section A 
1. Nitrogen compounds obtained by industrial fixation: 
? Ammonia 
? Urea 
 
2. Desirable traits for fodder crops: 
? Tallness 
? Profuse branching 
 
Section B 
3. Iron forms two types of ions, Fe
2+
 and Fe
3+
. 
The Fe
2+
 ion is known as iron (II) ion or ferrous ion and has valency of +2. The 
Fe
3+
 ion is known as iron (III) ion or ferric ion and it has a valency of +3. 
 
4. Here, the speed of sound, v = 330 m; time, t = 3 s 
Because the total distance covered by sound is two times the distance between the 
gunman and the cliff d, we have 
?
?
?
?
??
vt
d
2
330 m / s 3 s
 
2
d 495 m
 
5.  
(a) Striated muscles are under the control of one’s own will or volition. Hence, they 
are called voluntary muscles.  
(b) They are attached to the bones of the body. Therefore, they are mostly called 
skeletal muscles. 
OR 
 
The husk of coconut is made of sclerenchymatous tissue. The complex polymer lignin 
hardens the cell wall and is responsible for the stiffness of the sclerenchyma tissue. 
 
  
  
 
CBSE IX | SCIENCE 
Sample Paper – 10 Solution 
 
         
Section C 
6.  
(a) Nuclear pore: It allows the transfer of materials from inside the nucleus to the 
cytoplasm. 
(b) Nuclear membrane: It gives a distinct identity to the nucleus by keeping its 
contents inside and separate from the cytoplasm. 
(c) Chromosomes: They contain DNA which carries information necessary for 
constructing and organising cells. 
 
7. Pteridophyta, Gymnosperms and Angiosperms are called vascular plants. 
Angiosperms are further classified into monocotyledons and dicotyledons on the 
basis of the number of cotyledons. 
Characteristics of Angiosperms: 
(a) Seeds develop inside an organ which is modified to become a fruit. 
(b) Plant embryos in seeds have structures called cotyledons. 
OR 
Differences between Platyhelminths and Nematodes: 
 Platyhelminths Nematodes 
Body cavity ? No true body cavity ? Pseudocoelom present 
Body form ? Body is flattened ? Body is cylindrical 
 
Similarities between Platyhelminths and Nematodes: (any one) 
? Bilateral symmetry 
? Triploblastic  
 
8.  
1
2
12
11
1
1
22
2
2
Mass of car 1 = m 750 
Mass of car 2= m 1500 
 for both the cars is same.
The acceleration for car 1  is a
750
The acceleration for car 2 is a
1500
Thus the relation betwee
kg
kg
force
FF
FF
m
FF
m
?
?
??
??
??
12
1
1
2
2
11
22
12
12
n  a and a is given by,
a
750
a
1500
a 1500
  
a 750
 F F
2
F
F
F
F
aa
??
? ? ?
?
??
 
Thus, the acceleration of car 1 is twice the acceleration of car 2. 
Page 3


  
 
CBSE IX | SCIENCE 
Sample Paper – 10 Solution 
 
         
CBSE  
Class IX Science 
Sample Paper – 10 Solution  
 
Section A 
1. Nitrogen compounds obtained by industrial fixation: 
? Ammonia 
? Urea 
 
2. Desirable traits for fodder crops: 
? Tallness 
? Profuse branching 
 
Section B 
3. Iron forms two types of ions, Fe
2+
 and Fe
3+
. 
The Fe
2+
 ion is known as iron (II) ion or ferrous ion and has valency of +2. The 
Fe
3+
 ion is known as iron (III) ion or ferric ion and it has a valency of +3. 
 
4. Here, the speed of sound, v = 330 m; time, t = 3 s 
Because the total distance covered by sound is two times the distance between the 
gunman and the cliff d, we have 
?
?
?
?
??
vt
d
2
330 m / s 3 s
 
2
d 495 m
 
5.  
(a) Striated muscles are under the control of one’s own will or volition. Hence, they 
are called voluntary muscles.  
(b) They are attached to the bones of the body. Therefore, they are mostly called 
skeletal muscles. 
OR 
 
The husk of coconut is made of sclerenchymatous tissue. The complex polymer lignin 
hardens the cell wall and is responsible for the stiffness of the sclerenchyma tissue. 
 
  
  
 
CBSE IX | SCIENCE 
Sample Paper – 10 Solution 
 
         
Section C 
6.  
(a) Nuclear pore: It allows the transfer of materials from inside the nucleus to the 
cytoplasm. 
(b) Nuclear membrane: It gives a distinct identity to the nucleus by keeping its 
contents inside and separate from the cytoplasm. 
(c) Chromosomes: They contain DNA which carries information necessary for 
constructing and organising cells. 
 
7. Pteridophyta, Gymnosperms and Angiosperms are called vascular plants. 
Angiosperms are further classified into monocotyledons and dicotyledons on the 
basis of the number of cotyledons. 
Characteristics of Angiosperms: 
(a) Seeds develop inside an organ which is modified to become a fruit. 
(b) Plant embryos in seeds have structures called cotyledons. 
OR 
Differences between Platyhelminths and Nematodes: 
 Platyhelminths Nematodes 
Body cavity ? No true body cavity ? Pseudocoelom present 
Body form ? Body is flattened ? Body is cylindrical 
 
Similarities between Platyhelminths and Nematodes: (any one) 
? Bilateral symmetry 
? Triploblastic  
 
8.  
1
2
12
11
1
1
22
2
2
Mass of car 1 = m 750 
Mass of car 2= m 1500 
 for both the cars is same.
The acceleration for car 1  is a
750
The acceleration for car 2 is a
1500
Thus the relation betwee
kg
kg
force
FF
FF
m
FF
m
?
?
??
??
??
12
1
1
2
2
11
22
12
12
n  a and a is given by,
a
750
a
1500
a 1500
  
a 750
 F F
2
F
F
F
F
aa
??
? ? ?
?
??
 
Thus, the acceleration of car 1 is twice the acceleration of car 2. 
  
 
CBSE IX | SCIENCE 
Sample Paper – 10 Solution 
 
         
OR 
       
 
Consider two balls A and B of masses mA and mB, respectively, moving in the same 
direction along a straight line with velocities uA and uB. They collide for time t. After 
collision, their velocities become vA and vB. 
Force exerted by A on B is 
 
? ?
AB
AA
F Rate of change of momentum of B
m v u
t
?
?
?
 
Force exerted by B on A is 
 
? ?
BA
BB
F Rate of change of momentum of A
m v u
t
?
?
?
 
We assume that no other external unbalanced forces are acting on the balls. 
According to Newton’s third law of motion, action and reaction are equal and 
opposite. 
 
? ? ? ?
? ? ? ?
AB BA
A A A B B B
A A A B B B
A A B B A A B B
FF
m v u m v u
tt
m v u m v u
m u m u m v m v
??
??
??
? ? ? ?
? ? ? ?
 
 
Thus, total momentum before collision is equal to total momentum after collision. 
 
9. Hydrogen and oxygen are chemically combined in the water molecule and are 
present in a fixed ratio of 1:8 by mass. 
Properties of hydrogen and oxygen are different from those of water. 
 
  
Page 4


  
 
CBSE IX | SCIENCE 
Sample Paper – 10 Solution 
 
         
CBSE  
Class IX Science 
Sample Paper – 10 Solution  
 
Section A 
1. Nitrogen compounds obtained by industrial fixation: 
? Ammonia 
? Urea 
 
2. Desirable traits for fodder crops: 
? Tallness 
? Profuse branching 
 
Section B 
3. Iron forms two types of ions, Fe
2+
 and Fe
3+
. 
The Fe
2+
 ion is known as iron (II) ion or ferrous ion and has valency of +2. The 
Fe
3+
 ion is known as iron (III) ion or ferric ion and it has a valency of +3. 
 
4. Here, the speed of sound, v = 330 m; time, t = 3 s 
Because the total distance covered by sound is two times the distance between the 
gunman and the cliff d, we have 
?
?
?
?
??
vt
d
2
330 m / s 3 s
 
2
d 495 m
 
5.  
(a) Striated muscles are under the control of one’s own will or volition. Hence, they 
are called voluntary muscles.  
(b) They are attached to the bones of the body. Therefore, they are mostly called 
skeletal muscles. 
OR 
 
The husk of coconut is made of sclerenchymatous tissue. The complex polymer lignin 
hardens the cell wall and is responsible for the stiffness of the sclerenchyma tissue. 
 
  
  
 
CBSE IX | SCIENCE 
Sample Paper – 10 Solution 
 
         
Section C 
6.  
(a) Nuclear pore: It allows the transfer of materials from inside the nucleus to the 
cytoplasm. 
(b) Nuclear membrane: It gives a distinct identity to the nucleus by keeping its 
contents inside and separate from the cytoplasm. 
(c) Chromosomes: They contain DNA which carries information necessary for 
constructing and organising cells. 
 
7. Pteridophyta, Gymnosperms and Angiosperms are called vascular plants. 
Angiosperms are further classified into monocotyledons and dicotyledons on the 
basis of the number of cotyledons. 
Characteristics of Angiosperms: 
(a) Seeds develop inside an organ which is modified to become a fruit. 
(b) Plant embryos in seeds have structures called cotyledons. 
OR 
Differences between Platyhelminths and Nematodes: 
 Platyhelminths Nematodes 
Body cavity ? No true body cavity ? Pseudocoelom present 
Body form ? Body is flattened ? Body is cylindrical 
 
Similarities between Platyhelminths and Nematodes: (any one) 
? Bilateral symmetry 
? Triploblastic  
 
8.  
1
2
12
11
1
1
22
2
2
Mass of car 1 = m 750 
Mass of car 2= m 1500 
 for both the cars is same.
The acceleration for car 1  is a
750
The acceleration for car 2 is a
1500
Thus the relation betwee
kg
kg
force
FF
FF
m
FF
m
?
?
??
??
??
12
1
1
2
2
11
22
12
12
n  a and a is given by,
a
750
a
1500
a 1500
  
a 750
 F F
2
F
F
F
F
aa
??
? ? ?
?
??
 
Thus, the acceleration of car 1 is twice the acceleration of car 2. 
  
 
CBSE IX | SCIENCE 
Sample Paper – 10 Solution 
 
         
OR 
       
 
Consider two balls A and B of masses mA and mB, respectively, moving in the same 
direction along a straight line with velocities uA and uB. They collide for time t. After 
collision, their velocities become vA and vB. 
Force exerted by A on B is 
 
? ?
AB
AA
F Rate of change of momentum of B
m v u
t
?
?
?
 
Force exerted by B on A is 
 
? ?
BA
BB
F Rate of change of momentum of A
m v u
t
?
?
?
 
We assume that no other external unbalanced forces are acting on the balls. 
According to Newton’s third law of motion, action and reaction are equal and 
opposite. 
 
? ? ? ?
? ? ? ?
AB BA
A A A B B B
A A A B B B
A A B B A A B B
FF
m v u m v u
tt
m v u m v u
m u m u m v m v
??
??
??
? ? ? ?
? ? ? ?
 
 
Thus, total momentum before collision is equal to total momentum after collision. 
 
9. Hydrogen and oxygen are chemically combined in the water molecule and are 
present in a fixed ratio of 1:8 by mass. 
Properties of hydrogen and oxygen are different from those of water. 
 
  
  
 
CBSE IX | SCIENCE 
Sample Paper – 10 Solution 
 
         
10. Harmful effects of excessive irrigation: 
(a) It may lead to soil erosion. 
(b) It changes the composition of soil by solubilising some of the minerals from the 
soil. 
(c) It leads to water pollution. 
 
11. The scientific name of coconut is Cocos nucifera. In this case, the genus is Cocos and 
the species is nucifera. According to the rules of binomial nomenclature, the scientific 
name of every organism consists of two terms. The first term is the genus name and 
it begins with a capital letter. The second term is the species name which starts with 
a small letter.  
 
12. a) Gram molecular mass of chlorine = 2 × 35.5 = 71 g 
One mole of chlorine will weigh mass = Gram molecular mass = 71 g 
(b) Gram molecular mass of chlorine will contain = 6.022 × 1023 molecules 
      
23
21
6.022 10
7
71 g of chlorine
1
8.48 1
wil
0 mole
l con
culesof chlorine
tain  
?
??
?
 
OR 
 
 
13. The upward force acting on the object immersed in a liquid is called buoyant force. 
Factors affecting buoyant force: 
i) Volume of an object immersed in a liquid. 
ii) Density of the liquid in which the object is immersed. 
Buoyant force is also called ‘upthrust’. 
 
  
Page 5


  
 
CBSE IX | SCIENCE 
Sample Paper – 10 Solution 
 
         
CBSE  
Class IX Science 
Sample Paper – 10 Solution  
 
Section A 
1. Nitrogen compounds obtained by industrial fixation: 
? Ammonia 
? Urea 
 
2. Desirable traits for fodder crops: 
? Tallness 
? Profuse branching 
 
Section B 
3. Iron forms two types of ions, Fe
2+
 and Fe
3+
. 
The Fe
2+
 ion is known as iron (II) ion or ferrous ion and has valency of +2. The 
Fe
3+
 ion is known as iron (III) ion or ferric ion and it has a valency of +3. 
 
4. Here, the speed of sound, v = 330 m; time, t = 3 s 
Because the total distance covered by sound is two times the distance between the 
gunman and the cliff d, we have 
?
?
?
?
??
vt
d
2
330 m / s 3 s
 
2
d 495 m
 
5.  
(a) Striated muscles are under the control of one’s own will or volition. Hence, they 
are called voluntary muscles.  
(b) They are attached to the bones of the body. Therefore, they are mostly called 
skeletal muscles. 
OR 
 
The husk of coconut is made of sclerenchymatous tissue. The complex polymer lignin 
hardens the cell wall and is responsible for the stiffness of the sclerenchyma tissue. 
 
  
  
 
CBSE IX | SCIENCE 
Sample Paper – 10 Solution 
 
         
Section C 
6.  
(a) Nuclear pore: It allows the transfer of materials from inside the nucleus to the 
cytoplasm. 
(b) Nuclear membrane: It gives a distinct identity to the nucleus by keeping its 
contents inside and separate from the cytoplasm. 
(c) Chromosomes: They contain DNA which carries information necessary for 
constructing and organising cells. 
 
7. Pteridophyta, Gymnosperms and Angiosperms are called vascular plants. 
Angiosperms are further classified into monocotyledons and dicotyledons on the 
basis of the number of cotyledons. 
Characteristics of Angiosperms: 
(a) Seeds develop inside an organ which is modified to become a fruit. 
(b) Plant embryos in seeds have structures called cotyledons. 
OR 
Differences between Platyhelminths and Nematodes: 
 Platyhelminths Nematodes 
Body cavity ? No true body cavity ? Pseudocoelom present 
Body form ? Body is flattened ? Body is cylindrical 
 
Similarities between Platyhelminths and Nematodes: (any one) 
? Bilateral symmetry 
? Triploblastic  
 
8.  
1
2
12
11
1
1
22
2
2
Mass of car 1 = m 750 
Mass of car 2= m 1500 
 for both the cars is same.
The acceleration for car 1  is a
750
The acceleration for car 2 is a
1500
Thus the relation betwee
kg
kg
force
FF
FF
m
FF
m
?
?
??
??
??
12
1
1
2
2
11
22
12
12
n  a and a is given by,
a
750
a
1500
a 1500
  
a 750
 F F
2
F
F
F
F
aa
??
? ? ?
?
??
 
Thus, the acceleration of car 1 is twice the acceleration of car 2. 
  
 
CBSE IX | SCIENCE 
Sample Paper – 10 Solution 
 
         
OR 
       
 
Consider two balls A and B of masses mA and mB, respectively, moving in the same 
direction along a straight line with velocities uA and uB. They collide for time t. After 
collision, their velocities become vA and vB. 
Force exerted by A on B is 
 
? ?
AB
AA
F Rate of change of momentum of B
m v u
t
?
?
?
 
Force exerted by B on A is 
 
? ?
BA
BB
F Rate of change of momentum of A
m v u
t
?
?
?
 
We assume that no other external unbalanced forces are acting on the balls. 
According to Newton’s third law of motion, action and reaction are equal and 
opposite. 
 
? ? ? ?
? ? ? ?
AB BA
A A A B B B
A A A B B B
A A B B A A B B
FF
m v u m v u
tt
m v u m v u
m u m u m v m v
??
??
??
? ? ? ?
? ? ? ?
 
 
Thus, total momentum before collision is equal to total momentum after collision. 
 
9. Hydrogen and oxygen are chemically combined in the water molecule and are 
present in a fixed ratio of 1:8 by mass. 
Properties of hydrogen and oxygen are different from those of water. 
 
  
  
 
CBSE IX | SCIENCE 
Sample Paper – 10 Solution 
 
         
10. Harmful effects of excessive irrigation: 
(a) It may lead to soil erosion. 
(b) It changes the composition of soil by solubilising some of the minerals from the 
soil. 
(c) It leads to water pollution. 
 
11. The scientific name of coconut is Cocos nucifera. In this case, the genus is Cocos and 
the species is nucifera. According to the rules of binomial nomenclature, the scientific 
name of every organism consists of two terms. The first term is the genus name and 
it begins with a capital letter. The second term is the species name which starts with 
a small letter.  
 
12. a) Gram molecular mass of chlorine = 2 × 35.5 = 71 g 
One mole of chlorine will weigh mass = Gram molecular mass = 71 g 
(b) Gram molecular mass of chlorine will contain = 6.022 × 1023 molecules 
      
23
21
6.022 10
7
71 g of chlorine
1
8.48 1
wil
0 mole
l con
culesof chlorine
tain  
?
??
?
 
OR 
 
 
13. The upward force acting on the object immersed in a liquid is called buoyant force. 
Factors affecting buoyant force: 
i) Volume of an object immersed in a liquid. 
ii) Density of the liquid in which the object is immersed. 
Buoyant force is also called ‘upthrust’. 
 
  
  
 
CBSE IX | SCIENCE 
Sample Paper – 10 Solution 
 
         
14.  
(a) Molecular mass: 
? Barium chloride  
Molecular formula = BaCl2 
Atomic mass of Ba = 137, Cl = 35.5 
Molecular mass = 137 + (35.5 × 2) 
           = 208 units 
? Sodium sulphate 
Molecular formula = Na2SO4 
Atomic mass of Na = 23, S = 32, O=16 
Molecular mass = (23 × 2) + 32 + (16 × 4) 
           = 142 units 
(b) Neha showed scientific approach to complete the activity. 
 
15.  Speed is defined as the distance travelled per unit time. 
 Speed is a scalar quantity as it only has magnitude and not direction. 
 
Section D 
 
16. Bohr developed the Bohr model of the atom, in which he proposed that energy levels 
of electrons are discrete and that the electrons revolve in stable orbits around 
the atomic nucleus but can jump from one energy level (or orbit) to another. 
Bohr's model of an atom 
? Niels Bohr revised Rutherford’s atomic model and put forth the following 
suggestions: 
? Niels Bohr proposed that the electrons possess a specific amount of energy which 
allows them to revolve around the nucleus. 
? An atom contains discrete orbits which correspond to specific amount of energy. 
Hence, these orbits are also known as energy levels. 
? The energy levels of an atom are represented as K, L, M, N and so on or the 
numbers n = 1, 2, 3, 4 and so on.