Class 8 Science: CBSE Sample Question Paper Solutions Term II | Science Class 8 PDF Download

 Page 1


  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 1 Solution 
 
     
CBSE Board 
Class VIII Science 
Sample Paper – 1 Solution 
Term II 
 
SECTION A 
1.  (c) 
Silk moth provides silk fibre, whereas oysters provide pearls. 
 
2. (b) 
Vacuoles are called the storage sacs of the cell as it stores the solid as well as the liquid 
materials of the cell. 
 
3. (d) 
The menstrual cycle of women stops at the age of 45 to 50 years and this is called 
menopause. 
 
4. (b) 
The testes are enclosed in a sac like structure called scrotum. 
 
5. (a) 
When heated in air, coal burns and produces mainly carbon dioxide gas. 
 
6. (a) 
Exhaustible natural resources are limited as they take millions of years to form. 
 
7. (b) 
The luminous yellow zone of the flame is responsible for majority of the light emitted 
by a candle. 
 
8. (c) 
 Tools meant for cutting and piercing always have sharp edges so that they may 
produce large pressure to cut things easily. 
 
9. (c) 
 Carboxyhemoglobin is formed when carbon monoxide inhaled binds to the hemoglobin 
in the blood. 
 
10. (d) 
 Filtration is not a chemical method of purification of water. 
 
Page 2


  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 1 Solution 
 
     
CBSE Board 
Class VIII Science 
Sample Paper – 1 Solution 
Term II 
 
SECTION A 
1.  (c) 
Silk moth provides silk fibre, whereas oysters provide pearls. 
 
2. (b) 
Vacuoles are called the storage sacs of the cell as it stores the solid as well as the liquid 
materials of the cell. 
 
3. (d) 
The menstrual cycle of women stops at the age of 45 to 50 years and this is called 
menopause. 
 
4. (b) 
The testes are enclosed in a sac like structure called scrotum. 
 
5. (a) 
When heated in air, coal burns and produces mainly carbon dioxide gas. 
 
6. (a) 
Exhaustible natural resources are limited as they take millions of years to form. 
 
7. (b) 
The luminous yellow zone of the flame is responsible for majority of the light emitted 
by a candle. 
 
8. (c) 
 Tools meant for cutting and piercing always have sharp edges so that they may 
produce large pressure to cut things easily. 
 
9. (c) 
 Carboxyhemoglobin is formed when carbon monoxide inhaled binds to the hemoglobin 
in the blood. 
 
10. (d) 
 Filtration is not a chemical method of purification of water. 
 
  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 1 Solution 
 
     
11. (c) 
 Rahul must take the occurrence of earthquakes in a country under consideration 
before purchasing the house. The height of vibrations of the seismographic waves 
determines the intensity of earthquakes. The greater the height, the greater will be the 
intensity and vice-versa. Also, the number of waves counts for the number of 
earthquakes. It can be observed from the given seismographic records that earthquakes 
have occurred with minimum intensity in country 3. Hence, Rahul should purchase a 
house in country 3. 
 
12. (b) 
 The frictional force exerted by a fluid is called drag. 
 
13.  (b) 
The production of partial vacuum by the removal of air is called suction. 
 
14. (d) 
 On a full moon day, the full disc of the moon is visible and this happens in position IV. 
 
15. (a) 
 Orion has 7 or 8 bright stars. 
 
SECTION B 
16. Wood is used as firewood or turned into charcoal and used for cooking and heating 
purposes. Obtaining wood for fuel leads to deforestation. Due to deforestation, there 
will be no wood left for human use in a few years. 
 
17.  
(a) In sexual reproduction, fusion of the male and female gametes produces the zygote.  
(b) The development of a baby takes place in the uterus of the female. 
 
18.  
(a) A – Eggs 
(b) B - Early tadpole 
(c) C - Late tadpole 
(d) D - Adult frog 
 
  
Page 3


  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 1 Solution 
 
     
CBSE Board 
Class VIII Science 
Sample Paper – 1 Solution 
Term II 
 
SECTION A 
1.  (c) 
Silk moth provides silk fibre, whereas oysters provide pearls. 
 
2. (b) 
Vacuoles are called the storage sacs of the cell as it stores the solid as well as the liquid 
materials of the cell. 
 
3. (d) 
The menstrual cycle of women stops at the age of 45 to 50 years and this is called 
menopause. 
 
4. (b) 
The testes are enclosed in a sac like structure called scrotum. 
 
5. (a) 
When heated in air, coal burns and produces mainly carbon dioxide gas. 
 
6. (a) 
Exhaustible natural resources are limited as they take millions of years to form. 
 
7. (b) 
The luminous yellow zone of the flame is responsible for majority of the light emitted 
by a candle. 
 
8. (c) 
 Tools meant for cutting and piercing always have sharp edges so that they may 
produce large pressure to cut things easily. 
 
9. (c) 
 Carboxyhemoglobin is formed when carbon monoxide inhaled binds to the hemoglobin 
in the blood. 
 
10. (d) 
 Filtration is not a chemical method of purification of water. 
 
  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 1 Solution 
 
     
11. (c) 
 Rahul must take the occurrence of earthquakes in a country under consideration 
before purchasing the house. The height of vibrations of the seismographic waves 
determines the intensity of earthquakes. The greater the height, the greater will be the 
intensity and vice-versa. Also, the number of waves counts for the number of 
earthquakes. It can be observed from the given seismographic records that earthquakes 
have occurred with minimum intensity in country 3. Hence, Rahul should purchase a 
house in country 3. 
 
12. (b) 
 The frictional force exerted by a fluid is called drag. 
 
13.  (b) 
The production of partial vacuum by the removal of air is called suction. 
 
14. (d) 
 On a full moon day, the full disc of the moon is visible and this happens in position IV. 
 
15. (a) 
 Orion has 7 or 8 bright stars. 
 
SECTION B 
16. Wood is used as firewood or turned into charcoal and used for cooking and heating 
purposes. Obtaining wood for fuel leads to deforestation. Due to deforestation, there 
will be no wood left for human use in a few years. 
 
17.  
(a) In sexual reproduction, fusion of the male and female gametes produces the zygote.  
(b) The development of a baby takes place in the uterus of the female. 
 
18.  
(a) A – Eggs 
(b) B - Early tadpole 
(c) C - Late tadpole 
(d) D - Adult frog 
 
  
  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 1 Solution 
 
     
19. Carbonisation is the conversion of organic matter to a carbon-containing product. Coal 
mainly contains carbon. Therefore, the conversion of dead vegetation into coal is called 
carbonisation. 
 
20. The percentage of CO 2 in the atmosphere rises and becomes excessive due to the 
following human activities: 
i. Burning of fuels like coal, petrol or diesel etc. 
ii. Deforestation which leads to an increase in the amount of CO 2 in the air because the 
number of tress which consume CO 2 is reduced. 
 
21. Telescopic aids, Bifocal lenses, Contact lenses and Tinted lenses.  
 
22. Objects which produce sound are called sources of sound. For example, musical 
instruments, audio players etc. 
 
 
SECTION C 
 
 
23.  
 
Human ovum 
 
24.  
i. Mitochondria produce energy from food during respiration and are called the power 
houses of the cell. Both animal and plant cells possess mitochondria. 
ii. Endoplasmic reticulum helps in the transport of substances within the cell. 
iii. Ribosomes help in protein synthesis. Ribosomes are found in both plant and animal 
cells. 
iv. Golgi bodies synthesise, store and secrete many substances. 
 
  
Page 4


  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 1 Solution 
 
     
CBSE Board 
Class VIII Science 
Sample Paper – 1 Solution 
Term II 
 
SECTION A 
1.  (c) 
Silk moth provides silk fibre, whereas oysters provide pearls. 
 
2. (b) 
Vacuoles are called the storage sacs of the cell as it stores the solid as well as the liquid 
materials of the cell. 
 
3. (d) 
The menstrual cycle of women stops at the age of 45 to 50 years and this is called 
menopause. 
 
4. (b) 
The testes are enclosed in a sac like structure called scrotum. 
 
5. (a) 
When heated in air, coal burns and produces mainly carbon dioxide gas. 
 
6. (a) 
Exhaustible natural resources are limited as they take millions of years to form. 
 
7. (b) 
The luminous yellow zone of the flame is responsible for majority of the light emitted 
by a candle. 
 
8. (c) 
 Tools meant for cutting and piercing always have sharp edges so that they may 
produce large pressure to cut things easily. 
 
9. (c) 
 Carboxyhemoglobin is formed when carbon monoxide inhaled binds to the hemoglobin 
in the blood. 
 
10. (d) 
 Filtration is not a chemical method of purification of water. 
 
  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 1 Solution 
 
     
11. (c) 
 Rahul must take the occurrence of earthquakes in a country under consideration 
before purchasing the house. The height of vibrations of the seismographic waves 
determines the intensity of earthquakes. The greater the height, the greater will be the 
intensity and vice-versa. Also, the number of waves counts for the number of 
earthquakes. It can be observed from the given seismographic records that earthquakes 
have occurred with minimum intensity in country 3. Hence, Rahul should purchase a 
house in country 3. 
 
12. (b) 
 The frictional force exerted by a fluid is called drag. 
 
13.  (b) 
The production of partial vacuum by the removal of air is called suction. 
 
14. (d) 
 On a full moon day, the full disc of the moon is visible and this happens in position IV. 
 
15. (a) 
 Orion has 7 or 8 bright stars. 
 
SECTION B 
16. Wood is used as firewood or turned into charcoal and used for cooking and heating 
purposes. Obtaining wood for fuel leads to deforestation. Due to deforestation, there 
will be no wood left for human use in a few years. 
 
17.  
(a) In sexual reproduction, fusion of the male and female gametes produces the zygote.  
(b) The development of a baby takes place in the uterus of the female. 
 
18.  
(a) A – Eggs 
(b) B - Early tadpole 
(c) C - Late tadpole 
(d) D - Adult frog 
 
  
  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 1 Solution 
 
     
19. Carbonisation is the conversion of organic matter to a carbon-containing product. Coal 
mainly contains carbon. Therefore, the conversion of dead vegetation into coal is called 
carbonisation. 
 
20. The percentage of CO 2 in the atmosphere rises and becomes excessive due to the 
following human activities: 
i. Burning of fuels like coal, petrol or diesel etc. 
ii. Deforestation which leads to an increase in the amount of CO 2 in the air because the 
number of tress which consume CO 2 is reduced. 
 
21. Telescopic aids, Bifocal lenses, Contact lenses and Tinted lenses.  
 
22. Objects which produce sound are called sources of sound. For example, musical 
instruments, audio players etc. 
 
 
SECTION C 
 
 
23.  
 
Human ovum 
 
24.  
i. Mitochondria produce energy from food during respiration and are called the power 
houses of the cell. Both animal and plant cells possess mitochondria. 
ii. Endoplasmic reticulum helps in the transport of substances within the cell. 
iii. Ribosomes help in protein synthesis. Ribosomes are found in both plant and animal 
cells. 
iv. Golgi bodies synthesise, store and secrete many substances. 
 
  
  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 1 Solution 
 
     
25.  
 Plant cell Animal cell 
1 Plant cells have an outer, rigid cell 
wall. 
Animal cells lack a cell wall. 
2 Plastids are present in a plant cell. Plastids are absent in animal cells. 
3 Large, central and permanent 
vacuole is present.  
Animal cells have small and many 
vacuoles which may be temporary. 
4 Plant cell is generally larger than 
animal cell. 
Animal cell is smaller in size. 
 
26. Thermoplastics can be softened by heat but thermosetting plastics cannot be softened 
by heat. This is due to the difference in their structure. Both, thermoplastics and 
thermosetting plastics are made up of long chain molecules called polymers. In 
thermoplastics, the long polymer chains are not cross-linked with one another [Figure 
(a)]. Due to this, on heating, the individual polymer chains can slide over one another 
and thermoplastic material becomes soft and ultimately melts. 
 
On the other hand, in thermosetting plastics, the long polymer chains are cross linked 
with one another [Figure (b)]. These cross-links prevent the displacement (or sliding) 
of individual polymer chains on being heated. Due to this, thermosetting plastics do not 
become soft on heating (or change their shape on heating) once they have been set into 
a particular shape. 
 
 
 
For example, polythene is a thermoplastic having linear polymer chains with no cross-
linkages, so it becomes soft on heating. On the other hand, bakelite is a thermosetting 
plastic having long polymer chains connected through cross-links (or held strongly 
through cross-links), due to which it does not become soft on heating. 
 
 
  
Page 5


  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 1 Solution 
 
     
CBSE Board 
Class VIII Science 
Sample Paper – 1 Solution 
Term II 
 
SECTION A 
1.  (c) 
Silk moth provides silk fibre, whereas oysters provide pearls. 
 
2. (b) 
Vacuoles are called the storage sacs of the cell as it stores the solid as well as the liquid 
materials of the cell. 
 
3. (d) 
The menstrual cycle of women stops at the age of 45 to 50 years and this is called 
menopause. 
 
4. (b) 
The testes are enclosed in a sac like structure called scrotum. 
 
5. (a) 
When heated in air, coal burns and produces mainly carbon dioxide gas. 
 
6. (a) 
Exhaustible natural resources are limited as they take millions of years to form. 
 
7. (b) 
The luminous yellow zone of the flame is responsible for majority of the light emitted 
by a candle. 
 
8. (c) 
 Tools meant for cutting and piercing always have sharp edges so that they may 
produce large pressure to cut things easily. 
 
9. (c) 
 Carboxyhemoglobin is formed when carbon monoxide inhaled binds to the hemoglobin 
in the blood. 
 
10. (d) 
 Filtration is not a chemical method of purification of water. 
 
  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 1 Solution 
 
     
11. (c) 
 Rahul must take the occurrence of earthquakes in a country under consideration 
before purchasing the house. The height of vibrations of the seismographic waves 
determines the intensity of earthquakes. The greater the height, the greater will be the 
intensity and vice-versa. Also, the number of waves counts for the number of 
earthquakes. It can be observed from the given seismographic records that earthquakes 
have occurred with minimum intensity in country 3. Hence, Rahul should purchase a 
house in country 3. 
 
12. (b) 
 The frictional force exerted by a fluid is called drag. 
 
13.  (b) 
The production of partial vacuum by the removal of air is called suction. 
 
14. (d) 
 On a full moon day, the full disc of the moon is visible and this happens in position IV. 
 
15. (a) 
 Orion has 7 or 8 bright stars. 
 
SECTION B 
16. Wood is used as firewood or turned into charcoal and used for cooking and heating 
purposes. Obtaining wood for fuel leads to deforestation. Due to deforestation, there 
will be no wood left for human use in a few years. 
 
17.  
(a) In sexual reproduction, fusion of the male and female gametes produces the zygote.  
(b) The development of a baby takes place in the uterus of the female. 
 
18.  
(a) A – Eggs 
(b) B - Early tadpole 
(c) C - Late tadpole 
(d) D - Adult frog 
 
  
  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 1 Solution 
 
     
19. Carbonisation is the conversion of organic matter to a carbon-containing product. Coal 
mainly contains carbon. Therefore, the conversion of dead vegetation into coal is called 
carbonisation. 
 
20. The percentage of CO 2 in the atmosphere rises and becomes excessive due to the 
following human activities: 
i. Burning of fuels like coal, petrol or diesel etc. 
ii. Deforestation which leads to an increase in the amount of CO 2 in the air because the 
number of tress which consume CO 2 is reduced. 
 
21. Telescopic aids, Bifocal lenses, Contact lenses and Tinted lenses.  
 
22. Objects which produce sound are called sources of sound. For example, musical 
instruments, audio players etc. 
 
 
SECTION C 
 
 
23.  
 
Human ovum 
 
24.  
i. Mitochondria produce energy from food during respiration and are called the power 
houses of the cell. Both animal and plant cells possess mitochondria. 
ii. Endoplasmic reticulum helps in the transport of substances within the cell. 
iii. Ribosomes help in protein synthesis. Ribosomes are found in both plant and animal 
cells. 
iv. Golgi bodies synthesise, store and secrete many substances. 
 
  
  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 1 Solution 
 
     
25.  
 Plant cell Animal cell 
1 Plant cells have an outer, rigid cell 
wall. 
Animal cells lack a cell wall. 
2 Plastids are present in a plant cell. Plastids are absent in animal cells. 
3 Large, central and permanent 
vacuole is present.  
Animal cells have small and many 
vacuoles which may be temporary. 
4 Plant cell is generally larger than 
animal cell. 
Animal cell is smaller in size. 
 
26. Thermoplastics can be softened by heat but thermosetting plastics cannot be softened 
by heat. This is due to the difference in their structure. Both, thermoplastics and 
thermosetting plastics are made up of long chain molecules called polymers. In 
thermoplastics, the long polymer chains are not cross-linked with one another [Figure 
(a)]. Due to this, on heating, the individual polymer chains can slide over one another 
and thermoplastic material becomes soft and ultimately melts. 
 
On the other hand, in thermosetting plastics, the long polymer chains are cross linked 
with one another [Figure (b)]. These cross-links prevent the displacement (or sliding) 
of individual polymer chains on being heated. Due to this, thermosetting plastics do not 
become soft on heating (or change their shape on heating) once they have been set into 
a particular shape. 
 
 
 
For example, polythene is a thermoplastic having linear polymer chains with no cross-
linkages, so it becomes soft on heating. On the other hand, bakelite is a thermosetting 
plastic having long polymer chains connected through cross-links (or held strongly 
through cross-links), due to which it does not become soft on heating. 
 
 
  
  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 1 Solution 
 
     
27. A fire can be controlled in a number of ways. To extinguish a fire, one or more of the 
necessary conditions for its cause should be prevented i.e. either the supply of air 
should be cut off or the ignition temperature should be lowered. 
Following are the ways of controlling fire: 
1. Water, chemicals like soda etc. are used to bring down the ignition temperature. 
Water absorbs a lot of heat and brings down the ignition temperature below 
normal level and the fire is blown out. 
2. Sand, soil, thick clothes like blankets etc. are thrown upon the burning surface to 
cut off the supply of air. 
3. Different types of fire extinguishers can also be used. These cut off the supply of air 
by forming a layer of carbon dioxide gas around the fire. 
4. Removal of the cause or origin of fire can also be done. All the combustible 
materials should be removed from near the fire immediately. 
 
28.   
Ans  
(i) Sprinkler System: The perpendicular pipes with rotating nozzles on their top are 
joined to the main pipeline at regular intervals.  
When water is allowed to flow through the main pipe under pressure, it escapes 
from the rotating nozzles and gets sprinkled on the crop as if it is raining. 
(ii) Hoe: 
 
 
29. Frictional force is the force which tends to oppose the motion of the body. This force is 
directed opposite to the direction of the motion. Hence when a wooden block slides 
down an inclined plane obliquely, the frictional force acting on the body is directed in 
the exact opposite direction, i.e. obliquely upward in the same plane.  
 
30.  
(a) A ray of light is considered as an idealisation because in reality, there is only a 
narrow beam of light which is made up of several rays and for simplicity the term 
ray is used for a narrow beam of light.                                         
(b) Periscopes are used in submarines and tanks and also by soldiers in bunkers to see 
things outside.