Final Exam Class 9 Science Set 2 (Solutions) | Science Class 9 PDF Download

 Page 1


Section A
1. 
(b) All (A), (B) and (C) are correct 
Explanation:
A. During the change of state, given heat is used to change the state. So temperature remains same. AB and CD parts show
constant temperature
B. BC part represents increase in temperature.
C. CD is water starts boiling and temperature remains the same during the conversion of water into steam.
2. (a) cisternae 
Explanation: Golgi apparatus is a membrane-bound organelle of eukaryotic cells (cells with clearly defined nuclei) that is
made up of a series of flattened, stacked pouches called cisternae. The Golgi apparatus is responsible for transporting,
modifying, and packaging proteins and lipids into vesicles for delivery to targeted destinations.
3. (a) Negative 
Explanation: If a moving body comes to rest, then its acceleration is negative, as it’s velocity becomes zero. therefore the
acceleration is also zero.
4. (a) the flowers available for nectar collection by the bees 
Explanation: Pasturage is the availability of flowers to the bees for nectar and pollen collection. Pasturage is related to honey
production because it determines the taste of honey and the quantity of honey.
5. 
(b) Conduction of food 
Explanation: The epidermis does not conduct the food to the various parts of the plant. Conduction of food is carried by
phloem tissue.  
6. 
(c) ATP 
Explanation: Adenosine triphosphate (ATP) is called as the energy currency of the cell. The energy produced by a cell during
internal respiration is stored in the form of ATP molecules. ATP breaks into ADP and phosphate to produce energy during
cellular processes.  
7. 
(b) MSO
4
.5H
2
O 
Explanation: As the metal is divalent, the formula of hydrated sulphate will be MSO
4
xH
2
O  
To find the value of x: 
0.10 mol of MSO
4
 combines with 9 g of H
2
O (i.e., 0.5 mol of water). 
[ moles of H
2
O =  = 0.5] 
 1 mol of MSO
4
 will combine with  = 5 mol of water. 
So, formula of sulphate is MSO
4
5H
2
O.  
8. 
(d) a and b consist of living cells while c consists of dead cells. 
Explanation: In the given figure of plant tissues ‘a’ and ‘b’ represent parenchymatous and collenchymatous tissues
respectively that are living tissues whereas figure ‘c’ represents sclerenchymatous tissue which comprises of dead cells.  
9. 
(b) U
w
 > U
s
 
Explanation: The density of salty water is more as compared to tap water hence, the upthrust by salty water is more.  
· ? 9 1 8 ? 0 . 5 0 . 1 0 · Solution
Page 8 of 14
Page 2


Section A
1. 
(b) All (A), (B) and (C) are correct 
Explanation:
A. During the change of state, given heat is used to change the state. So temperature remains same. AB and CD parts show
constant temperature
B. BC part represents increase in temperature.
C. CD is water starts boiling and temperature remains the same during the conversion of water into steam.
2. (a) cisternae 
Explanation: Golgi apparatus is a membrane-bound organelle of eukaryotic cells (cells with clearly defined nuclei) that is
made up of a series of flattened, stacked pouches called cisternae. The Golgi apparatus is responsible for transporting,
modifying, and packaging proteins and lipids into vesicles for delivery to targeted destinations.
3. (a) Negative 
Explanation: If a moving body comes to rest, then its acceleration is negative, as it’s velocity becomes zero. therefore the
acceleration is also zero.
4. (a) the flowers available for nectar collection by the bees 
Explanation: Pasturage is the availability of flowers to the bees for nectar and pollen collection. Pasturage is related to honey
production because it determines the taste of honey and the quantity of honey.
5. 
(b) Conduction of food 
Explanation: The epidermis does not conduct the food to the various parts of the plant. Conduction of food is carried by
phloem tissue.  
6. 
(c) ATP 
Explanation: Adenosine triphosphate (ATP) is called as the energy currency of the cell. The energy produced by a cell during
internal respiration is stored in the form of ATP molecules. ATP breaks into ADP and phosphate to produce energy during
cellular processes.  
7. 
(b) MSO
4
.5H
2
O 
Explanation: As the metal is divalent, the formula of hydrated sulphate will be MSO
4
xH
2
O  
To find the value of x: 
0.10 mol of MSO
4
 combines with 9 g of H
2
O (i.e., 0.5 mol of water). 
[ moles of H
2
O =  = 0.5] 
 1 mol of MSO
4
 will combine with  = 5 mol of water. 
So, formula of sulphate is MSO
4
5H
2
O.  
8. 
(d) a and b consist of living cells while c consists of dead cells. 
Explanation: In the given figure of plant tissues ‘a’ and ‘b’ represent parenchymatous and collenchymatous tissues
respectively that are living tissues whereas figure ‘c’ represents sclerenchymatous tissue which comprises of dead cells.  
9. 
(b) U
w
 > U
s
 
Explanation: The density of salty water is more as compared to tap water hence, the upthrust by salty water is more.  
· ? 9 1 8 ? 0 . 5 0 . 1 0 · Solution
Page 8 of 14
10. 
(d) 7.2 m
-1
 S
2
 
Explanation: For motion with uniform acceleration a
1
: 
From v = u + at 
v = a
1
t
1
 ( u = 0),  t
1
 =  ...(i) 
and from s = ut + at
2
, 
Using eqn. (i) 
s
1
 = a
1
 =  ...(ii) 
For motion with uniform retardation a
2
: 
From v = u + at 
v = a
2
t
2
 ( v = 0, u = v, a = -a
2
) 
t
2
 =  ...(iii) 
and from s = ut + at
2
 
s
2
 =  
s
2
 =  =  ...(iv) 
Given, s
1 
+ s
2
 = 4 km and t
1 
+ t
2
 = 4 min, so using (ii) and (iv), 
= 4 ...(v) 
and v = 4 ...(vi) 
Dividing eqn. (v) by eqn. (vi), we get v = 2 
Putting this in eqn. (vi), 
 = 2 =  
= 7.2 m
-1
 s
2
  
11. 
(c) Ar, Ca are isobars and D, T, P are isotopes 
Explanation: Elements having the same atomic number but different atomic masses are known as Isotopes. 
Protium(Hydrogen) -1, Deuterium – 2, Tritium -3 are three isotopes of hydrogen. 
Atoms having the same atomic mass and different atomic numbers are known as Isobars. Example Argon, Calcium.  
12. 
(d) Areolar connective tissue 
Explanation: Areolar connective tissue is the simplest and most widely distributed connective tissue. Areolar connective tissue
is found between the skin and muscles, around blood vessels and nerves, and in the bone marrow.  
13. 
(b) Golgi apparatus 
Explanation: Lysosomes are membrane bound vesicles that arise from the  Golgi apparatus.  
14. 
(c) Agitating a detergent with water in a washing machine 
Explanation: Detergent in water will form a mixture, others will not form a mixture. 
15. (a) visible with a powerful microscope 
Explanation: The size of particles of the colloidal solution lies between 10
-7
 cm to 10
-4
 cm in diameter. So, The particles of
colloidal solutions are visible with a powerful microscope.
16. (a) High cost production 
Explanation: High cost production
17. 
(b) Both A and R are true but R is not the correct explanation of A. 
Explanation: Average velocity V
av
 
=  = V 
? ? v a 1 1 2 1 2 ( ) v a 1 2 v 2 2 a 1 ? ( ) v a 2 1 2 v + ( - ) · v a 2 1 2 a 2 v 2 a 2 2 - v 2 a 2 v 2 2 a 2 v 2 2 a 2 ( + ) v 2 2 1 a 1 1 a 2 ( + ) 1 a 1 1 a 2 + 1 a 1 1 a 2 m i n 2   k m 2 × 3 6 0 0 1 0 0 0 s 2 m =   T o t a l d i s p l a c e m e n t     T o t a l e l a p s e d t i m e   V t t Page 9 of 14
Page 3


Section A
1. 
(b) All (A), (B) and (C) are correct 
Explanation:
A. During the change of state, given heat is used to change the state. So temperature remains same. AB and CD parts show
constant temperature
B. BC part represents increase in temperature.
C. CD is water starts boiling and temperature remains the same during the conversion of water into steam.
2. (a) cisternae 
Explanation: Golgi apparatus is a membrane-bound organelle of eukaryotic cells (cells with clearly defined nuclei) that is
made up of a series of flattened, stacked pouches called cisternae. The Golgi apparatus is responsible for transporting,
modifying, and packaging proteins and lipids into vesicles for delivery to targeted destinations.
3. (a) Negative 
Explanation: If a moving body comes to rest, then its acceleration is negative, as it’s velocity becomes zero. therefore the
acceleration is also zero.
4. (a) the flowers available for nectar collection by the bees 
Explanation: Pasturage is the availability of flowers to the bees for nectar and pollen collection. Pasturage is related to honey
production because it determines the taste of honey and the quantity of honey.
5. 
(b) Conduction of food 
Explanation: The epidermis does not conduct the food to the various parts of the plant. Conduction of food is carried by
phloem tissue.  
6. 
(c) ATP 
Explanation: Adenosine triphosphate (ATP) is called as the energy currency of the cell. The energy produced by a cell during
internal respiration is stored in the form of ATP molecules. ATP breaks into ADP and phosphate to produce energy during
cellular processes.  
7. 
(b) MSO
4
.5H
2
O 
Explanation: As the metal is divalent, the formula of hydrated sulphate will be MSO
4
xH
2
O  
To find the value of x: 
0.10 mol of MSO
4
 combines with 9 g of H
2
O (i.e., 0.5 mol of water). 
[ moles of H
2
O =  = 0.5] 
 1 mol of MSO
4
 will combine with  = 5 mol of water. 
So, formula of sulphate is MSO
4
5H
2
O.  
8. 
(d) a and b consist of living cells while c consists of dead cells. 
Explanation: In the given figure of plant tissues ‘a’ and ‘b’ represent parenchymatous and collenchymatous tissues
respectively that are living tissues whereas figure ‘c’ represents sclerenchymatous tissue which comprises of dead cells.  
9. 
(b) U
w
 > U
s
 
Explanation: The density of salty water is more as compared to tap water hence, the upthrust by salty water is more.  
· ? 9 1 8 ? 0 . 5 0 . 1 0 · Solution
Page 8 of 14
10. 
(d) 7.2 m
-1
 S
2
 
Explanation: For motion with uniform acceleration a
1
: 
From v = u + at 
v = a
1
t
1
 ( u = 0),  t
1
 =  ...(i) 
and from s = ut + at
2
, 
Using eqn. (i) 
s
1
 = a
1
 =  ...(ii) 
For motion with uniform retardation a
2
: 
From v = u + at 
v = a
2
t
2
 ( v = 0, u = v, a = -a
2
) 
t
2
 =  ...(iii) 
and from s = ut + at
2
 
s
2
 =  
s
2
 =  =  ...(iv) 
Given, s
1 
+ s
2
 = 4 km and t
1 
+ t
2
 = 4 min, so using (ii) and (iv), 
= 4 ...(v) 
and v = 4 ...(vi) 
Dividing eqn. (v) by eqn. (vi), we get v = 2 
Putting this in eqn. (vi), 
 = 2 =  
= 7.2 m
-1
 s
2
  
11. 
(c) Ar, Ca are isobars and D, T, P are isotopes 
Explanation: Elements having the same atomic number but different atomic masses are known as Isotopes. 
Protium(Hydrogen) -1, Deuterium – 2, Tritium -3 are three isotopes of hydrogen. 
Atoms having the same atomic mass and different atomic numbers are known as Isobars. Example Argon, Calcium.  
12. 
(d) Areolar connective tissue 
Explanation: Areolar connective tissue is the simplest and most widely distributed connective tissue. Areolar connective tissue
is found between the skin and muscles, around blood vessels and nerves, and in the bone marrow.  
13. 
(b) Golgi apparatus 
Explanation: Lysosomes are membrane bound vesicles that arise from the  Golgi apparatus.  
14. 
(c) Agitating a detergent with water in a washing machine 
Explanation: Detergent in water will form a mixture, others will not form a mixture. 
15. (a) visible with a powerful microscope 
Explanation: The size of particles of the colloidal solution lies between 10
-7
 cm to 10
-4
 cm in diameter. So, The particles of
colloidal solutions are visible with a powerful microscope.
16. (a) High cost production 
Explanation: High cost production
17. 
(b) Both A and R are true but R is not the correct explanation of A. 
Explanation: Average velocity V
av
 
=  = V 
? ? v a 1 1 2 1 2 ( ) v a 1 2 v 2 2 a 1 ? ( ) v a 2 1 2 v + ( - ) · v a 2 1 2 a 2 v 2 a 2 2 - v 2 a 2 v 2 2 a 2 v 2 2 a 2 ( + ) v 2 2 1 a 1 1 a 2 ( + ) 1 a 1 1 a 2 + 1 a 1 1 a 2 m i n 2   k m 2 × 3 6 0 0 1 0 0 0 s 2 m =   T o t a l d i s p l a c e m e n t     T o t a l e l a p s e d t i m e   V t t Page 9 of 14
= Instantaneous velocity 
Hence, assertion is correct. If a particle is in a round trip on a straight line, then average velocity is zero but at the instant at
which the particle reverses its direction of motion, velocity is zero. So, reason is correct. But reason is not the correct
explanation of assertion.  
18. 
(b) Both A and R are true but R is not the correct explanation of A. 
Explanation: Almirah is rigid and has fixed shape. So, it is a solid at room temperature.  
19. 
(c) A is true but R is false. 
Explanation: Parenchyma tissue consists of relatively unspecialized cells with thin cell walls. They are live cells. They are
usually loosely packed so that large spaces between them.   
20. (a) Both A and R are true and R is the correct explanation of A. 
Explanation: Both A and R are true and R is the correct explanation of A.
Section B
21. In case of a body moving along a circular path, the force (centripetal) is always along the radius while displacement is tangential.
Hence work done W = Fs cos 90
o
 = 0 as angle between F and s is 90
o
.
OR
Sheet crumpled into a ball has small surface area as compared to the similar unfolded sheet. Therefore unfolded sheet will
experience more friction due to air as compared to the sheet crumpled into a ball in spite of same force of gravity acts upon them.
It is larger friction of air which slows down the unfolded sheet and therefore it falls slower as compared to sheet crumpled into a
ball.
22. Since hot sizzling food has temperature higher than the cold food and at higher temperature diffusion rate (movement) of particles
is very fast due to this the smell of hot sizzling food reaches us from several metres away but to get the smell from cold food you
have to go close.
23. We see the lightning before we hear the thunder because light travels faster thansound. The light from the lightning travels to our
eyes much quicker than the soundfrom the lightning. so we hear it later than we see it.
24. While melting ice absorbs latent heat of melting from the surroundings and gets changed into water that makes the cooling effect
more intense as compared to water at same temperature.
i. 25.  
 
 
 
= -10
7
 ms
-2
 
 F = m.a = -10
5
 N
ii.  
 0=(10
3
) - 10
7
t 
 10
7
t = 10
3
 
 
OR
Let m be the mass of the body 
Given : F = 40 N, a = 5 ms
-2
 
From the relation : F = ma we have 40 = m  5 
or m = 
26. 
J. J.Thomson Model of Atom Rutherford's Model of Atom
1. Positive charge forms a kernel.
1. Nucleus (dense positive charge) is in the centre of
the atom.
2. Electrons are present (embedded in positive charge) throughout the
atom.
2. Electrons revolve around the nucleus in orbits.
3. No space inside the atom is empty. Thomson likened an atom to a 3. According to Rutherford, most of the space inside
m = 1 0 g = k g , u = m / s , ? = 0 , s = m 1 0 1 0 0 0 1 0 3 5 1 0 0 - = 2 a s ? 2 u 2 ? 0 - ( = 2 . a . 1 0 3 ) 2 5 1 0 0 ? a = × 1 0 0 - 1 0 0 0 × 1 0 0 0 2 × 5 ? ? = u + a t ? ? ? t = = s 1 0 3 1 0 7 1 0 - 4 × = 8 k g 4 0 5 Page 10 of 14
Page 4


Section A
1. 
(b) All (A), (B) and (C) are correct 
Explanation:
A. During the change of state, given heat is used to change the state. So temperature remains same. AB and CD parts show
constant temperature
B. BC part represents increase in temperature.
C. CD is water starts boiling and temperature remains the same during the conversion of water into steam.
2. (a) cisternae 
Explanation: Golgi apparatus is a membrane-bound organelle of eukaryotic cells (cells with clearly defined nuclei) that is
made up of a series of flattened, stacked pouches called cisternae. The Golgi apparatus is responsible for transporting,
modifying, and packaging proteins and lipids into vesicles for delivery to targeted destinations.
3. (a) Negative 
Explanation: If a moving body comes to rest, then its acceleration is negative, as it’s velocity becomes zero. therefore the
acceleration is also zero.
4. (a) the flowers available for nectar collection by the bees 
Explanation: Pasturage is the availability of flowers to the bees for nectar and pollen collection. Pasturage is related to honey
production because it determines the taste of honey and the quantity of honey.
5. 
(b) Conduction of food 
Explanation: The epidermis does not conduct the food to the various parts of the plant. Conduction of food is carried by
phloem tissue.  
6. 
(c) ATP 
Explanation: Adenosine triphosphate (ATP) is called as the energy currency of the cell. The energy produced by a cell during
internal respiration is stored in the form of ATP molecules. ATP breaks into ADP and phosphate to produce energy during
cellular processes.  
7. 
(b) MSO
4
.5H
2
O 
Explanation: As the metal is divalent, the formula of hydrated sulphate will be MSO
4
xH
2
O  
To find the value of x: 
0.10 mol of MSO
4
 combines with 9 g of H
2
O (i.e., 0.5 mol of water). 
[ moles of H
2
O =  = 0.5] 
 1 mol of MSO
4
 will combine with  = 5 mol of water. 
So, formula of sulphate is MSO
4
5H
2
O.  
8. 
(d) a and b consist of living cells while c consists of dead cells. 
Explanation: In the given figure of plant tissues ‘a’ and ‘b’ represent parenchymatous and collenchymatous tissues
respectively that are living tissues whereas figure ‘c’ represents sclerenchymatous tissue which comprises of dead cells.  
9. 
(b) U
w
 > U
s
 
Explanation: The density of salty water is more as compared to tap water hence, the upthrust by salty water is more.  
· ? 9 1 8 ? 0 . 5 0 . 1 0 · Solution
Page 8 of 14
10. 
(d) 7.2 m
-1
 S
2
 
Explanation: For motion with uniform acceleration a
1
: 
From v = u + at 
v = a
1
t
1
 ( u = 0),  t
1
 =  ...(i) 
and from s = ut + at
2
, 
Using eqn. (i) 
s
1
 = a
1
 =  ...(ii) 
For motion with uniform retardation a
2
: 
From v = u + at 
v = a
2
t
2
 ( v = 0, u = v, a = -a
2
) 
t
2
 =  ...(iii) 
and from s = ut + at
2
 
s
2
 =  
s
2
 =  =  ...(iv) 
Given, s
1 
+ s
2
 = 4 km and t
1 
+ t
2
 = 4 min, so using (ii) and (iv), 
= 4 ...(v) 
and v = 4 ...(vi) 
Dividing eqn. (v) by eqn. (vi), we get v = 2 
Putting this in eqn. (vi), 
 = 2 =  
= 7.2 m
-1
 s
2
  
11. 
(c) Ar, Ca are isobars and D, T, P are isotopes 
Explanation: Elements having the same atomic number but different atomic masses are known as Isotopes. 
Protium(Hydrogen) -1, Deuterium – 2, Tritium -3 are three isotopes of hydrogen. 
Atoms having the same atomic mass and different atomic numbers are known as Isobars. Example Argon, Calcium.  
12. 
(d) Areolar connective tissue 
Explanation: Areolar connective tissue is the simplest and most widely distributed connective tissue. Areolar connective tissue
is found between the skin and muscles, around blood vessels and nerves, and in the bone marrow.  
13. 
(b) Golgi apparatus 
Explanation: Lysosomes are membrane bound vesicles that arise from the  Golgi apparatus.  
14. 
(c) Agitating a detergent with water in a washing machine 
Explanation: Detergent in water will form a mixture, others will not form a mixture. 
15. (a) visible with a powerful microscope 
Explanation: The size of particles of the colloidal solution lies between 10
-7
 cm to 10
-4
 cm in diameter. So, The particles of
colloidal solutions are visible with a powerful microscope.
16. (a) High cost production 
Explanation: High cost production
17. 
(b) Both A and R are true but R is not the correct explanation of A. 
Explanation: Average velocity V
av
 
=  = V 
? ? v a 1 1 2 1 2 ( ) v a 1 2 v 2 2 a 1 ? ( ) v a 2 1 2 v + ( - ) · v a 2 1 2 a 2 v 2 a 2 2 - v 2 a 2 v 2 2 a 2 v 2 2 a 2 ( + ) v 2 2 1 a 1 1 a 2 ( + ) 1 a 1 1 a 2 + 1 a 1 1 a 2 m i n 2   k m 2 × 3 6 0 0 1 0 0 0 s 2 m =   T o t a l d i s p l a c e m e n t     T o t a l e l a p s e d t i m e   V t t Page 9 of 14
= Instantaneous velocity 
Hence, assertion is correct. If a particle is in a round trip on a straight line, then average velocity is zero but at the instant at
which the particle reverses its direction of motion, velocity is zero. So, reason is correct. But reason is not the correct
explanation of assertion.  
18. 
(b) Both A and R are true but R is not the correct explanation of A. 
Explanation: Almirah is rigid and has fixed shape. So, it is a solid at room temperature.  
19. 
(c) A is true but R is false. 
Explanation: Parenchyma tissue consists of relatively unspecialized cells with thin cell walls. They are live cells. They are
usually loosely packed so that large spaces between them.   
20. (a) Both A and R are true and R is the correct explanation of A. 
Explanation: Both A and R are true and R is the correct explanation of A.
Section B
21. In case of a body moving along a circular path, the force (centripetal) is always along the radius while displacement is tangential.
Hence work done W = Fs cos 90
o
 = 0 as angle between F and s is 90
o
.
OR
Sheet crumpled into a ball has small surface area as compared to the similar unfolded sheet. Therefore unfolded sheet will
experience more friction due to air as compared to the sheet crumpled into a ball in spite of same force of gravity acts upon them.
It is larger friction of air which slows down the unfolded sheet and therefore it falls slower as compared to sheet crumpled into a
ball.
22. Since hot sizzling food has temperature higher than the cold food and at higher temperature diffusion rate (movement) of particles
is very fast due to this the smell of hot sizzling food reaches us from several metres away but to get the smell from cold food you
have to go close.
23. We see the lightning before we hear the thunder because light travels faster thansound. The light from the lightning travels to our
eyes much quicker than the soundfrom the lightning. so we hear it later than we see it.
24. While melting ice absorbs latent heat of melting from the surroundings and gets changed into water that makes the cooling effect
more intense as compared to water at same temperature.
i. 25.  
 
 
 
= -10
7
 ms
-2
 
 F = m.a = -10
5
 N
ii.  
 0=(10
3
) - 10
7
t 
 10
7
t = 10
3
 
 
OR
Let m be the mass of the body 
Given : F = 40 N, a = 5 ms
-2
 
From the relation : F = ma we have 40 = m  5 
or m = 
26. 
J. J.Thomson Model of Atom Rutherford's Model of Atom
1. Positive charge forms a kernel.
1. Nucleus (dense positive charge) is in the centre of
the atom.
2. Electrons are present (embedded in positive charge) throughout the
atom.
2. Electrons revolve around the nucleus in orbits.
3. No space inside the atom is empty. Thomson likened an atom to a 3. According to Rutherford, most of the space inside
m = 1 0 g = k g , u = m / s , ? = 0 , s = m 1 0 1 0 0 0 1 0 3 5 1 0 0 - = 2 a s ? 2 u 2 ? 0 - ( = 2 . a . 1 0 3 ) 2 5 1 0 0 ? a = × 1 0 0 - 1 0 0 0 × 1 0 0 0 2 × 5 ? ? = u + a t ? ? ? t = = s 1 0 3 1 0 7 1 0 - 4 × = 8 k g 4 0 5 Page 10 of 14
pudding or a watermelon. the atom is empty.
Section C
i. 27. Sound is produced when a material body is made to vibrate with some mechanical energy. So, school bell is struck with a
hammer to make it vibrate and thus the sound is produced.
ii. The time taken by the signal to reach the bottom and come back is 4.8 s 
Speed of sound in water = 1500 m/s 
Depth of the ocean h 
h =  
h =  
h = 1500  2.4 
h = 3600 m
28. 
Proton Neutron Electron
(i) It is positively-charged sub-atomic particle. (i) It is neutral sub-atomic particle.
(i) It is negatively-charged sub-atomic
particle.
(ii) Its mass is equivalent to a hydrogen atom
i.e. 1 a.m.u
(ii) It mass is equal to the mass of a
proton.
(ii) Its mass is 1/1838 of the mass of a
proton.
(iii) It is present inside the nucleus of an atom.
(iii) It is also found inside the atomic
nucleus.
(iii) It is found outside the nucleus of
an atom.
29. Given speed of the bus = 60 kmh
-1
 = = 16.7 ms
-1
 
Time of reaction =  s 
Time of reaction under the influence of alcohol =  s 
i) Distance travelled by the bus in the first case distance = Speed × time = 16.7 ×  = 1.11m 
ii) Distance travelled by the bus in the second case distance = Speed × time = 16.7 ×  = 8.35m 
OR
In the first case:  
Since body starts from stationary position, 
 Initial velocity, u = 0 
final velocity, v = 6 ms
-1
 
time, t = 30 s 
 
Substituting the given values of u, v, and t in the above equation. we get 
 
= 0.2 m 
In the second case: 
initial velocity, u = 6 ms
–1
 
time, t = 5 s 
 
= -0.4 ms
-2
 
The acceleration of the bicycle in the first case is 0.2 ms
–2
 and in the second case, it is –0.4 ms
–2
30. Weight of water displaced = 50 gf 
Weight of alcohol displaced = (50 -10) gf = 40 gf 
As volume of water displaced = Volume of alcohol displaced 
RD of alcohol = 
i. 31. While walking on sand, the sand gets pressed down, impacting less reaction force on the person.
ii. The mass of the heavy gun is higher. So, its recoil velocity is less.
32. Chloroplasts contain the pigment chlorophyll which is responsible for food preparation in plants by the process of photosynthesis.
Hence, if there were no chloroplasts then there would not have been any plant life.
OR
v × t 2 1 5 0 0 × 4 . 8 2 × × 6 0 5 1 8 1 1 5 1 2 1 1 5 1 2 ? a = v - u t a = ( 6 m - 0 m ) s - 1 s - 3 3 0 s s 2   T h e n .   a = ( 4 m - 6 m ) s - 2 s - 2 5 s = w e i g h t o f a l c o h o l d i s p l a c e d w e i g h t o f e q u a l v o l u m e o f w a t e r d i s p l a c e d 4 0 5 0 Page 11 of 14
Page 5


Section A
1. 
(b) All (A), (B) and (C) are correct 
Explanation:
A. During the change of state, given heat is used to change the state. So temperature remains same. AB and CD parts show
constant temperature
B. BC part represents increase in temperature.
C. CD is water starts boiling and temperature remains the same during the conversion of water into steam.
2. (a) cisternae 
Explanation: Golgi apparatus is a membrane-bound organelle of eukaryotic cells (cells with clearly defined nuclei) that is
made up of a series of flattened, stacked pouches called cisternae. The Golgi apparatus is responsible for transporting,
modifying, and packaging proteins and lipids into vesicles for delivery to targeted destinations.
3. (a) Negative 
Explanation: If a moving body comes to rest, then its acceleration is negative, as it’s velocity becomes zero. therefore the
acceleration is also zero.
4. (a) the flowers available for nectar collection by the bees 
Explanation: Pasturage is the availability of flowers to the bees for nectar and pollen collection. Pasturage is related to honey
production because it determines the taste of honey and the quantity of honey.
5. 
(b) Conduction of food 
Explanation: The epidermis does not conduct the food to the various parts of the plant. Conduction of food is carried by
phloem tissue.  
6. 
(c) ATP 
Explanation: Adenosine triphosphate (ATP) is called as the energy currency of the cell. The energy produced by a cell during
internal respiration is stored in the form of ATP molecules. ATP breaks into ADP and phosphate to produce energy during
cellular processes.  
7. 
(b) MSO
4
.5H
2
O 
Explanation: As the metal is divalent, the formula of hydrated sulphate will be MSO
4
xH
2
O  
To find the value of x: 
0.10 mol of MSO
4
 combines with 9 g of H
2
O (i.e., 0.5 mol of water). 
[ moles of H
2
O =  = 0.5] 
 1 mol of MSO
4
 will combine with  = 5 mol of water. 
So, formula of sulphate is MSO
4
5H
2
O.  
8. 
(d) a and b consist of living cells while c consists of dead cells. 
Explanation: In the given figure of plant tissues ‘a’ and ‘b’ represent parenchymatous and collenchymatous tissues
respectively that are living tissues whereas figure ‘c’ represents sclerenchymatous tissue which comprises of dead cells.  
9. 
(b) U
w
 > U
s
 
Explanation: The density of salty water is more as compared to tap water hence, the upthrust by salty water is more.  
· ? 9 1 8 ? 0 . 5 0 . 1 0 · Solution
Page 8 of 14
10. 
(d) 7.2 m
-1
 S
2
 
Explanation: For motion with uniform acceleration a
1
: 
From v = u + at 
v = a
1
t
1
 ( u = 0),  t
1
 =  ...(i) 
and from s = ut + at
2
, 
Using eqn. (i) 
s
1
 = a
1
 =  ...(ii) 
For motion with uniform retardation a
2
: 
From v = u + at 
v = a
2
t
2
 ( v = 0, u = v, a = -a
2
) 
t
2
 =  ...(iii) 
and from s = ut + at
2
 
s
2
 =  
s
2
 =  =  ...(iv) 
Given, s
1 
+ s
2
 = 4 km and t
1 
+ t
2
 = 4 min, so using (ii) and (iv), 
= 4 ...(v) 
and v = 4 ...(vi) 
Dividing eqn. (v) by eqn. (vi), we get v = 2 
Putting this in eqn. (vi), 
 = 2 =  
= 7.2 m
-1
 s
2
  
11. 
(c) Ar, Ca are isobars and D, T, P are isotopes 
Explanation: Elements having the same atomic number but different atomic masses are known as Isotopes. 
Protium(Hydrogen) -1, Deuterium – 2, Tritium -3 are three isotopes of hydrogen. 
Atoms having the same atomic mass and different atomic numbers are known as Isobars. Example Argon, Calcium.  
12. 
(d) Areolar connective tissue 
Explanation: Areolar connective tissue is the simplest and most widely distributed connective tissue. Areolar connective tissue
is found between the skin and muscles, around blood vessels and nerves, and in the bone marrow.  
13. 
(b) Golgi apparatus 
Explanation: Lysosomes are membrane bound vesicles that arise from the  Golgi apparatus.  
14. 
(c) Agitating a detergent with water in a washing machine 
Explanation: Detergent in water will form a mixture, others will not form a mixture. 
15. (a) visible with a powerful microscope 
Explanation: The size of particles of the colloidal solution lies between 10
-7
 cm to 10
-4
 cm in diameter. So, The particles of
colloidal solutions are visible with a powerful microscope.
16. (a) High cost production 
Explanation: High cost production
17. 
(b) Both A and R are true but R is not the correct explanation of A. 
Explanation: Average velocity V
av
 
=  = V 
? ? v a 1 1 2 1 2 ( ) v a 1 2 v 2 2 a 1 ? ( ) v a 2 1 2 v + ( - ) · v a 2 1 2 a 2 v 2 a 2 2 - v 2 a 2 v 2 2 a 2 v 2 2 a 2 ( + ) v 2 2 1 a 1 1 a 2 ( + ) 1 a 1 1 a 2 + 1 a 1 1 a 2 m i n 2   k m 2 × 3 6 0 0 1 0 0 0 s 2 m =   T o t a l d i s p l a c e m e n t     T o t a l e l a p s e d t i m e   V t t Page 9 of 14
= Instantaneous velocity 
Hence, assertion is correct. If a particle is in a round trip on a straight line, then average velocity is zero but at the instant at
which the particle reverses its direction of motion, velocity is zero. So, reason is correct. But reason is not the correct
explanation of assertion.  
18. 
(b) Both A and R are true but R is not the correct explanation of A. 
Explanation: Almirah is rigid and has fixed shape. So, it is a solid at room temperature.  
19. 
(c) A is true but R is false. 
Explanation: Parenchyma tissue consists of relatively unspecialized cells with thin cell walls. They are live cells. They are
usually loosely packed so that large spaces between them.   
20. (a) Both A and R are true and R is the correct explanation of A. 
Explanation: Both A and R are true and R is the correct explanation of A.
Section B
21. In case of a body moving along a circular path, the force (centripetal) is always along the radius while displacement is tangential.
Hence work done W = Fs cos 90
o
 = 0 as angle between F and s is 90
o
.
OR
Sheet crumpled into a ball has small surface area as compared to the similar unfolded sheet. Therefore unfolded sheet will
experience more friction due to air as compared to the sheet crumpled into a ball in spite of same force of gravity acts upon them.
It is larger friction of air which slows down the unfolded sheet and therefore it falls slower as compared to sheet crumpled into a
ball.
22. Since hot sizzling food has temperature higher than the cold food and at higher temperature diffusion rate (movement) of particles
is very fast due to this the smell of hot sizzling food reaches us from several metres away but to get the smell from cold food you
have to go close.
23. We see the lightning before we hear the thunder because light travels faster thansound. The light from the lightning travels to our
eyes much quicker than the soundfrom the lightning. so we hear it later than we see it.
24. While melting ice absorbs latent heat of melting from the surroundings and gets changed into water that makes the cooling effect
more intense as compared to water at same temperature.
i. 25.  
 
 
 
= -10
7
 ms
-2
 
 F = m.a = -10
5
 N
ii.  
 0=(10
3
) - 10
7
t 
 10
7
t = 10
3
 
 
OR
Let m be the mass of the body 
Given : F = 40 N, a = 5 ms
-2
 
From the relation : F = ma we have 40 = m  5 
or m = 
26. 
J. J.Thomson Model of Atom Rutherford's Model of Atom
1. Positive charge forms a kernel.
1. Nucleus (dense positive charge) is in the centre of
the atom.
2. Electrons are present (embedded in positive charge) throughout the
atom.
2. Electrons revolve around the nucleus in orbits.
3. No space inside the atom is empty. Thomson likened an atom to a 3. According to Rutherford, most of the space inside
m = 1 0 g = k g , u = m / s , ? = 0 , s = m 1 0 1 0 0 0 1 0 3 5 1 0 0 - = 2 a s ? 2 u 2 ? 0 - ( = 2 . a . 1 0 3 ) 2 5 1 0 0 ? a = × 1 0 0 - 1 0 0 0 × 1 0 0 0 2 × 5 ? ? = u + a t ? ? ? t = = s 1 0 3 1 0 7 1 0 - 4 × = 8 k g 4 0 5 Page 10 of 14
pudding or a watermelon. the atom is empty.
Section C
i. 27. Sound is produced when a material body is made to vibrate with some mechanical energy. So, school bell is struck with a
hammer to make it vibrate and thus the sound is produced.
ii. The time taken by the signal to reach the bottom and come back is 4.8 s 
Speed of sound in water = 1500 m/s 
Depth of the ocean h 
h =  
h =  
h = 1500  2.4 
h = 3600 m
28. 
Proton Neutron Electron
(i) It is positively-charged sub-atomic particle. (i) It is neutral sub-atomic particle.
(i) It is negatively-charged sub-atomic
particle.
(ii) Its mass is equivalent to a hydrogen atom
i.e. 1 a.m.u
(ii) It mass is equal to the mass of a
proton.
(ii) Its mass is 1/1838 of the mass of a
proton.
(iii) It is present inside the nucleus of an atom.
(iii) It is also found inside the atomic
nucleus.
(iii) It is found outside the nucleus of
an atom.
29. Given speed of the bus = 60 kmh
-1
 = = 16.7 ms
-1
 
Time of reaction =  s 
Time of reaction under the influence of alcohol =  s 
i) Distance travelled by the bus in the first case distance = Speed × time = 16.7 ×  = 1.11m 
ii) Distance travelled by the bus in the second case distance = Speed × time = 16.7 ×  = 8.35m 
OR
In the first case:  
Since body starts from stationary position, 
 Initial velocity, u = 0 
final velocity, v = 6 ms
-1
 
time, t = 30 s 
 
Substituting the given values of u, v, and t in the above equation. we get 
 
= 0.2 m 
In the second case: 
initial velocity, u = 6 ms
–1
 
time, t = 5 s 
 
= -0.4 ms
-2
 
The acceleration of the bicycle in the first case is 0.2 ms
–2
 and in the second case, it is –0.4 ms
–2
30. Weight of water displaced = 50 gf 
Weight of alcohol displaced = (50 -10) gf = 40 gf 
As volume of water displaced = Volume of alcohol displaced 
RD of alcohol = 
i. 31. While walking on sand, the sand gets pressed down, impacting less reaction force on the person.
ii. The mass of the heavy gun is higher. So, its recoil velocity is less.
32. Chloroplasts contain the pigment chlorophyll which is responsible for food preparation in plants by the process of photosynthesis.
Hence, if there were no chloroplasts then there would not have been any plant life.
OR
v × t 2 1 5 0 0 × 4 . 8 2 × × 6 0 5 1 8 1 1 5 1 2 1 1 5 1 2 ? a = v - u t a = ( 6 m - 0 m ) s - 1 s - 3 3 0 s s 2   T h e n .   a = ( 4 m - 6 m ) s - 2 s - 2 5 s = w e i g h t o f a l c o h o l d i s p l a c e d w e i g h t o f e q u a l v o l u m e o f w a t e r d i s p l a c e d 4 0 5 0 Page 11 of 14
In 1665, an English scientist named Robert Hooke discovered cells. He saw honey comb like structure while observing thin slice
of cork under his self-designed microscope.
33. 
Types Striated Muscles Unstriated Muscles Cardiac Muscles
Structure
These are made up of long, cylindrical,
unbranched and multinucleate cells.
These show alternate light and dark
striations.
These muscles are made up of long
uninucleate cells with pointed ends.
These are made up of
cells, which are
cylindrical, branched and
uninucleate.
Striations
They show alternate light and dark bands
or striations.
These do not show striations.
These muscles show
faint striations.
Site/Location
These are located in limbs and are
mostly attached to bones to help in body
movement.
These are mostly present in the walls of
the alimentary canal. blood vessels,
ureters, bronchi of the lungs and in the iris
of eyes.
These are present only in
the walls of the heart.
i. Striated muscle  
ii. Smooth muscle  
iii. Cardiac muscle 
Section D
i. 34. We know that, Original weight,W
o
 = mg = , where M is the mass of the earth, m= mass of body. 
Let the new mass of earth = M' 
According to question, New mass, M' = M + 10% of M = M + M = M +  =  = 1.1M 
New weight, W
n
=  =  
Now, Ratio of new weight to original weight =  =  = 1.1 
New weight becomes 1.1 times the original weight of body.
i.e., weight of body will increase by 10%.
ii. Again, Original Weight, W
o
 = , where R is the radius of the earth. 
According to question, when R changes to 2R, the new weight is given by, 
New weight,W
n
 =  
Now, Ratio of new weight to original weight = =  =  
Therefore, New weight becomes  times of original weight
OR
i. Formula to find the magnitude of gravitational force: 
F = . 
where, M = mass of the earth 
m = mass of the object 
G M m R 2 1 0 1 0 0 M 1 0 1 1 M 1 0 ? G m M ' R 2 G × 1 . 1 M m R 2 N e w   w e i g h t O r i g i n a l   w e i g h t 1 . 1 G M m / R 2 G M m / R 2 G M m R 2 G M m 4 R 2 N e w   w e i g h t O r i g i n a l   w e i g h t G M m / 4 R 2 G M m / R 2 1 4 1 4 G M m R 2 Page 12 of 14