Sample Solution Paper 1 - Term- 2 Science, Class 7 Class 7 Notes | EduRev

Science Class 7

Class 7 : Sample Solution Paper 1 - Term- 2 Science, Class 7 Class 7 Notes | EduRev

 Page 1


  
 
CBSE VII  | SCIENCE 
Sample Paper – 1 Solution 
 
     
CBSE Board 
Class VII Science 
Sample Paper – 1 Solution 
Term II 
 
SECTION A 
1. (a) 
Veins carry carbon dioxide rich blood from all the parts of the body back to the heart. 
 
2. (b) 
The temperature increases as the day advances due to perpendicular Sun rays. 
 
3. (a) 
Food web is a network of a large number of food chains existing in an ecosystem which   
shows the linkage among various species. 
 
4. (b) 
During any physical activity or exercise, oxygen gets used up faster and a temporary 
deficiency of oxygen occurs on our muscle cells. Hence, we tend to feel hungry to meet 
the increased energy demands. 
 
5. (d)  
On Rukmavati river, the construction of 18 check dams is being planned by an N.G.O. 
and the villagers. 
 
6. (a) 
A change in which one or more new substances are formed is called a chemical change. 
The reaction will be: 
Ca(OH) 2   +   2HCl   ?    CaCl 2   +   2H 2O 
 
7. (c) 
Stainless steel is an alloy of iron with chromium and nickel. 
 
8. (d) 
Surgical instruments do not rust at all since they are made of iron mixed with nickel. 
This forms the stainless steel alloy. It is a non-corrosive metal. 
 
9. (a) 
Aluminium is a good conductor of heat. Others are bad conductors of heat. 
 
10. (a) 
The air near the source of heat rises away from the source. 
Page 2


  
 
CBSE VII  | SCIENCE 
Sample Paper – 1 Solution 
 
     
CBSE Board 
Class VII Science 
Sample Paper – 1 Solution 
Term II 
 
SECTION A 
1. (a) 
Veins carry carbon dioxide rich blood from all the parts of the body back to the heart. 
 
2. (b) 
The temperature increases as the day advances due to perpendicular Sun rays. 
 
3. (a) 
Food web is a network of a large number of food chains existing in an ecosystem which   
shows the linkage among various species. 
 
4. (b) 
During any physical activity or exercise, oxygen gets used up faster and a temporary 
deficiency of oxygen occurs on our muscle cells. Hence, we tend to feel hungry to meet 
the increased energy demands. 
 
5. (d)  
On Rukmavati river, the construction of 18 check dams is being planned by an N.G.O. 
and the villagers. 
 
6. (a) 
A change in which one or more new substances are formed is called a chemical change. 
The reaction will be: 
Ca(OH) 2   +   2HCl   ?    CaCl 2   +   2H 2O 
 
7. (c) 
Stainless steel is an alloy of iron with chromium and nickel. 
 
8. (d) 
Surgical instruments do not rust at all since they are made of iron mixed with nickel. 
This forms the stainless steel alloy. It is a non-corrosive metal. 
 
9. (a) 
Aluminium is a good conductor of heat. Others are bad conductors of heat. 
 
10. (a) 
The air near the source of heat rises away from the source. 
  
 
CBSE VII  | SCIENCE 
Sample Paper – 1 Solution 
 
     
11. (b) 
When the direction of current flowing through a coil is reversed, the direction of 
deflection in the needle compass kept near it also gets reversed. 
 
12. (b) 
The image is formed at the same distance as object. The image is laterally inverted. The 
image is virtual and erect. 
 
13. (d) 
The phenomenon of bouncing back of light falling on a smooth polished surface is 
known as reflection. 
 
14. (d) 
The wavelength range of visible light is from 4000 Å to 8000 Å . 
 
15. (c) 
Different colours of light are refracted at different angles. This difference in the angles 
of refraction of different colours during refraction results in a colourful spectrum. 
 
 
SECTION B 
 
16. A is the ureter which carries urine from the kidney to the urinary bladder. 
B is the urinary bladder which stores urine temporarily before it is removed out from 
the body. 
 
17. Plants release oxygen through the process of photosynthesis which helps the animals in 
respiration. They also maintain the balance of oxygen and carbon dioxide in the 
atmosphere. That is why, forests are called green lungs. 
 
18. The top level of underground water is called the water table.  
      Factors affecting the water table: 
i. Average rainfall in that area. 
ii. Pumping out of groundwater. 
 
19. In the method of galvanization, surface of iron is coated with the layer of a more active 
metal such as zinc.  
Zinc metal prevents the surface of iron from coming in contact with air and moisture 
and protects it from rusting.  
 
  
Page 3


  
 
CBSE VII  | SCIENCE 
Sample Paper – 1 Solution 
 
     
CBSE Board 
Class VII Science 
Sample Paper – 1 Solution 
Term II 
 
SECTION A 
1. (a) 
Veins carry carbon dioxide rich blood from all the parts of the body back to the heart. 
 
2. (b) 
The temperature increases as the day advances due to perpendicular Sun rays. 
 
3. (a) 
Food web is a network of a large number of food chains existing in an ecosystem which   
shows the linkage among various species. 
 
4. (b) 
During any physical activity or exercise, oxygen gets used up faster and a temporary 
deficiency of oxygen occurs on our muscle cells. Hence, we tend to feel hungry to meet 
the increased energy demands. 
 
5. (d)  
On Rukmavati river, the construction of 18 check dams is being planned by an N.G.O. 
and the villagers. 
 
6. (a) 
A change in which one or more new substances are formed is called a chemical change. 
The reaction will be: 
Ca(OH) 2   +   2HCl   ?    CaCl 2   +   2H 2O 
 
7. (c) 
Stainless steel is an alloy of iron with chromium and nickel. 
 
8. (d) 
Surgical instruments do not rust at all since they are made of iron mixed with nickel. 
This forms the stainless steel alloy. It is a non-corrosive metal. 
 
9. (a) 
Aluminium is a good conductor of heat. Others are bad conductors of heat. 
 
10. (a) 
The air near the source of heat rises away from the source. 
  
 
CBSE VII  | SCIENCE 
Sample Paper – 1 Solution 
 
     
11. (b) 
When the direction of current flowing through a coil is reversed, the direction of 
deflection in the needle compass kept near it also gets reversed. 
 
12. (b) 
The image is formed at the same distance as object. The image is laterally inverted. The 
image is virtual and erect. 
 
13. (d) 
The phenomenon of bouncing back of light falling on a smooth polished surface is 
known as reflection. 
 
14. (d) 
The wavelength range of visible light is from 4000 Å to 8000 Å . 
 
15. (c) 
Different colours of light are refracted at different angles. This difference in the angles 
of refraction of different colours during refraction results in a colourful spectrum. 
 
 
SECTION B 
 
16. A is the ureter which carries urine from the kidney to the urinary bladder. 
B is the urinary bladder which stores urine temporarily before it is removed out from 
the body. 
 
17. Plants release oxygen through the process of photosynthesis which helps the animals in 
respiration. They also maintain the balance of oxygen and carbon dioxide in the 
atmosphere. That is why, forests are called green lungs. 
 
18. The top level of underground water is called the water table.  
      Factors affecting the water table: 
i. Average rainfall in that area. 
ii. Pumping out of groundwater. 
 
19. In the method of galvanization, surface of iron is coated with the layer of a more active 
metal such as zinc.  
Zinc metal prevents the surface of iron from coming in contact with air and moisture 
and protects it from rusting.  
 
  
  
 
CBSE VII  | SCIENCE 
Sample Paper – 1 Solution 
 
     
20. The melting of wax is a physical change but burning of wax is a chemical change. So, the 
same substance i.e. wax, can undergo both physical and chemical change. On melting, 
the only change that occurs is in the state of wax but, on burning wax, it produces 
carbon dioxide gas, water vapour, soot, heat and light. Hence, it is a chemical change. 
 
21.  
 
 
22. Two advantages of CFLs are: 
i. CFLs do not have filaments and do not work on heating effect of current. So, they do 
not waste electricity by producing heat. 
ii. CFLs can be fixed in ordinary bulb holders which are used for traditional, filament-
type electric bulbs. 
 
SECTION C 
23.  
(a)  
i. Seed dispersal refers to a spread of seeds away from the parent plant to a new 
growing location in order to prevent overcrowding. 
ii. When the fruits burst with sudden jerks, the seeds are dispersed and are 
scattered far from the parent plant. 
(b)  
i. Almond and walnut. 
ii. Seed coat. 
 
24.  
(i) Inside the pitcher of the pitcher plant, there is hair which is directed downwards. 
When an insect lands on the pitcher, the lid closes automatically. The trapped 
insect gets entangled in the hair of the pitcher and thus cannot escape. After some 
time, the insect dies in the pitcher. 
(ii) The tiny fungal spores are generally present in the air. When they land on a wet 
and warm surface, they germinate and grow. 
 
 
  
Page 4


  
 
CBSE VII  | SCIENCE 
Sample Paper – 1 Solution 
 
     
CBSE Board 
Class VII Science 
Sample Paper – 1 Solution 
Term II 
 
SECTION A 
1. (a) 
Veins carry carbon dioxide rich blood from all the parts of the body back to the heart. 
 
2. (b) 
The temperature increases as the day advances due to perpendicular Sun rays. 
 
3. (a) 
Food web is a network of a large number of food chains existing in an ecosystem which   
shows the linkage among various species. 
 
4. (b) 
During any physical activity or exercise, oxygen gets used up faster and a temporary 
deficiency of oxygen occurs on our muscle cells. Hence, we tend to feel hungry to meet 
the increased energy demands. 
 
5. (d)  
On Rukmavati river, the construction of 18 check dams is being planned by an N.G.O. 
and the villagers. 
 
6. (a) 
A change in which one or more new substances are formed is called a chemical change. 
The reaction will be: 
Ca(OH) 2   +   2HCl   ?    CaCl 2   +   2H 2O 
 
7. (c) 
Stainless steel is an alloy of iron with chromium and nickel. 
 
8. (d) 
Surgical instruments do not rust at all since they are made of iron mixed with nickel. 
This forms the stainless steel alloy. It is a non-corrosive metal. 
 
9. (a) 
Aluminium is a good conductor of heat. Others are bad conductors of heat. 
 
10. (a) 
The air near the source of heat rises away from the source. 
  
 
CBSE VII  | SCIENCE 
Sample Paper – 1 Solution 
 
     
11. (b) 
When the direction of current flowing through a coil is reversed, the direction of 
deflection in the needle compass kept near it also gets reversed. 
 
12. (b) 
The image is formed at the same distance as object. The image is laterally inverted. The 
image is virtual and erect. 
 
13. (d) 
The phenomenon of bouncing back of light falling on a smooth polished surface is 
known as reflection. 
 
14. (d) 
The wavelength range of visible light is from 4000 Å to 8000 Å . 
 
15. (c) 
Different colours of light are refracted at different angles. This difference in the angles 
of refraction of different colours during refraction results in a colourful spectrum. 
 
 
SECTION B 
 
16. A is the ureter which carries urine from the kidney to the urinary bladder. 
B is the urinary bladder which stores urine temporarily before it is removed out from 
the body. 
 
17. Plants release oxygen through the process of photosynthesis which helps the animals in 
respiration. They also maintain the balance of oxygen and carbon dioxide in the 
atmosphere. That is why, forests are called green lungs. 
 
18. The top level of underground water is called the water table.  
      Factors affecting the water table: 
i. Average rainfall in that area. 
ii. Pumping out of groundwater. 
 
19. In the method of galvanization, surface of iron is coated with the layer of a more active 
metal such as zinc.  
Zinc metal prevents the surface of iron from coming in contact with air and moisture 
and protects it from rusting.  
 
  
  
 
CBSE VII  | SCIENCE 
Sample Paper – 1 Solution 
 
     
20. The melting of wax is a physical change but burning of wax is a chemical change. So, the 
same substance i.e. wax, can undergo both physical and chemical change. On melting, 
the only change that occurs is in the state of wax but, on burning wax, it produces 
carbon dioxide gas, water vapour, soot, heat and light. Hence, it is a chemical change. 
 
21.  
 
 
22. Two advantages of CFLs are: 
i. CFLs do not have filaments and do not work on heating effect of current. So, they do 
not waste electricity by producing heat. 
ii. CFLs can be fixed in ordinary bulb holders which are used for traditional, filament-
type electric bulbs. 
 
SECTION C 
23.  
(a)  
i. Seed dispersal refers to a spread of seeds away from the parent plant to a new 
growing location in order to prevent overcrowding. 
ii. When the fruits burst with sudden jerks, the seeds are dispersed and are 
scattered far from the parent plant. 
(b)  
i. Almond and walnut. 
ii. Seed coat. 
 
24.  
(i) Inside the pitcher of the pitcher plant, there is hair which is directed downwards. 
When an insect lands on the pitcher, the lid closes automatically. The trapped 
insect gets entangled in the hair of the pitcher and thus cannot escape. After some 
time, the insect dies in the pitcher. 
(ii) The tiny fungal spores are generally present in the air. When they land on a wet 
and warm surface, they germinate and grow. 
 
 
  
  
 
CBSE VII  | SCIENCE 
Sample Paper – 1 Solution 
 
     
25.  
(a) Food is the source of energy and every cell of an organism gets energy by the 
breakdown of glucose. The cells use this energy to carry out vital activities of life. 
Therefore, food must be made available to every cell of an organism. 
(b)  
i. Xylem transports water and nutrients in the plants. 
ii. Phloem transports food to all parts of the plant. 
 
26.   
(a) Ammonium sulphate solution will turn blue litmus to red because it is acidic in 
nature. 
(b) Sodium carbonate solution will turn phenolphthalein to pink because it is basic in 
nature. 
(c) Sodium carbonate solution will turn China rose indicator to green because it is 
basic in nature. 
(d) Sodium sulphate solution will have no effect on any indicator because it is neutral 
in nature. 
 
27.  
(a) Formation of clouds is a physical change because it is a phase of transformation of 
water from liquid to gas during water cycle and then, gas to liquid. Hence, only the 
physical properties of water undergo change in the formation of clouds. 
(b) Melting of butter is a chemical change. Butter is an emulsion of fat and water. When 
it is heated, the emulsion breaks up and fat gets separated from water to form two 
layers. This fat layer separated, is usually called ghee. The properties of ghee and 
butter are different and we cannot get butter back from ghee. 
 
28. Rusting of iron can be prevented using the following methods: 
i. Galvanization: In this method, the surface of iron is coated with a layer of a more 
active metal such as zinc.  
Zinc metal prevents the surface of iron from coming in contact with air and moisture 
and protects it from rusting. 
ii. Chrome-plating: Chromium metal is resistant to the action of air and moisture. 
Hence, when a layer of chromium is deposited on an iron object, the iron object is 
protected from rusting. 
iii. Alloying: When iron is alloyed with carbon, chromium and nickel, stainless steel is 
obtained. Stainless steel does not rust at all. 
iv. Painting: When a coat of paint is applied to the surface of an iron object, it prevents 
it from coming in contact with air and moisture and protects it from rusting. 
 
 
  
Page 5


  
 
CBSE VII  | SCIENCE 
Sample Paper – 1 Solution 
 
     
CBSE Board 
Class VII Science 
Sample Paper – 1 Solution 
Term II 
 
SECTION A 
1. (a) 
Veins carry carbon dioxide rich blood from all the parts of the body back to the heart. 
 
2. (b) 
The temperature increases as the day advances due to perpendicular Sun rays. 
 
3. (a) 
Food web is a network of a large number of food chains existing in an ecosystem which   
shows the linkage among various species. 
 
4. (b) 
During any physical activity or exercise, oxygen gets used up faster and a temporary 
deficiency of oxygen occurs on our muscle cells. Hence, we tend to feel hungry to meet 
the increased energy demands. 
 
5. (d)  
On Rukmavati river, the construction of 18 check dams is being planned by an N.G.O. 
and the villagers. 
 
6. (a) 
A change in which one or more new substances are formed is called a chemical change. 
The reaction will be: 
Ca(OH) 2   +   2HCl   ?    CaCl 2   +   2H 2O 
 
7. (c) 
Stainless steel is an alloy of iron with chromium and nickel. 
 
8. (d) 
Surgical instruments do not rust at all since they are made of iron mixed with nickel. 
This forms the stainless steel alloy. It is a non-corrosive metal. 
 
9. (a) 
Aluminium is a good conductor of heat. Others are bad conductors of heat. 
 
10. (a) 
The air near the source of heat rises away from the source. 
  
 
CBSE VII  | SCIENCE 
Sample Paper – 1 Solution 
 
     
11. (b) 
When the direction of current flowing through a coil is reversed, the direction of 
deflection in the needle compass kept near it also gets reversed. 
 
12. (b) 
The image is formed at the same distance as object. The image is laterally inverted. The 
image is virtual and erect. 
 
13. (d) 
The phenomenon of bouncing back of light falling on a smooth polished surface is 
known as reflection. 
 
14. (d) 
The wavelength range of visible light is from 4000 Å to 8000 Å . 
 
15. (c) 
Different colours of light are refracted at different angles. This difference in the angles 
of refraction of different colours during refraction results in a colourful spectrum. 
 
 
SECTION B 
 
16. A is the ureter which carries urine from the kidney to the urinary bladder. 
B is the urinary bladder which stores urine temporarily before it is removed out from 
the body. 
 
17. Plants release oxygen through the process of photosynthesis which helps the animals in 
respiration. They also maintain the balance of oxygen and carbon dioxide in the 
atmosphere. That is why, forests are called green lungs. 
 
18. The top level of underground water is called the water table.  
      Factors affecting the water table: 
i. Average rainfall in that area. 
ii. Pumping out of groundwater. 
 
19. In the method of galvanization, surface of iron is coated with the layer of a more active 
metal such as zinc.  
Zinc metal prevents the surface of iron from coming in contact with air and moisture 
and protects it from rusting.  
 
  
  
 
CBSE VII  | SCIENCE 
Sample Paper – 1 Solution 
 
     
20. The melting of wax is a physical change but burning of wax is a chemical change. So, the 
same substance i.e. wax, can undergo both physical and chemical change. On melting, 
the only change that occurs is in the state of wax but, on burning wax, it produces 
carbon dioxide gas, water vapour, soot, heat and light. Hence, it is a chemical change. 
 
21.  
 
 
22. Two advantages of CFLs are: 
i. CFLs do not have filaments and do not work on heating effect of current. So, they do 
not waste electricity by producing heat. 
ii. CFLs can be fixed in ordinary bulb holders which are used for traditional, filament-
type electric bulbs. 
 
SECTION C 
23.  
(a)  
i. Seed dispersal refers to a spread of seeds away from the parent plant to a new 
growing location in order to prevent overcrowding. 
ii. When the fruits burst with sudden jerks, the seeds are dispersed and are 
scattered far from the parent plant. 
(b)  
i. Almond and walnut. 
ii. Seed coat. 
 
24.  
(i) Inside the pitcher of the pitcher plant, there is hair which is directed downwards. 
When an insect lands on the pitcher, the lid closes automatically. The trapped 
insect gets entangled in the hair of the pitcher and thus cannot escape. After some 
time, the insect dies in the pitcher. 
(ii) The tiny fungal spores are generally present in the air. When they land on a wet 
and warm surface, they germinate and grow. 
 
 
  
  
 
CBSE VII  | SCIENCE 
Sample Paper – 1 Solution 
 
     
25.  
(a) Food is the source of energy and every cell of an organism gets energy by the 
breakdown of glucose. The cells use this energy to carry out vital activities of life. 
Therefore, food must be made available to every cell of an organism. 
(b)  
i. Xylem transports water and nutrients in the plants. 
ii. Phloem transports food to all parts of the plant. 
 
26.   
(a) Ammonium sulphate solution will turn blue litmus to red because it is acidic in 
nature. 
(b) Sodium carbonate solution will turn phenolphthalein to pink because it is basic in 
nature. 
(c) Sodium carbonate solution will turn China rose indicator to green because it is 
basic in nature. 
(d) Sodium sulphate solution will have no effect on any indicator because it is neutral 
in nature. 
 
27.  
(a) Formation of clouds is a physical change because it is a phase of transformation of 
water from liquid to gas during water cycle and then, gas to liquid. Hence, only the 
physical properties of water undergo change in the formation of clouds. 
(b) Melting of butter is a chemical change. Butter is an emulsion of fat and water. When 
it is heated, the emulsion breaks up and fat gets separated from water to form two 
layers. This fat layer separated, is usually called ghee. The properties of ghee and 
butter are different and we cannot get butter back from ghee. 
 
28. Rusting of iron can be prevented using the following methods: 
i. Galvanization: In this method, the surface of iron is coated with a layer of a more 
active metal such as zinc.  
Zinc metal prevents the surface of iron from coming in contact with air and moisture 
and protects it from rusting. 
ii. Chrome-plating: Chromium metal is resistant to the action of air and moisture. 
Hence, when a layer of chromium is deposited on an iron object, the iron object is 
protected from rusting. 
iii. Alloying: When iron is alloyed with carbon, chromium and nickel, stainless steel is 
obtained. Stainless steel does not rust at all. 
iv. Painting: When a coat of paint is applied to the surface of an iron object, it prevents 
it from coming in contact with air and moisture and protects it from rusting. 
 
 
  
  
 
CBSE VII  | SCIENCE 
Sample Paper – 1 Solution 
 
     
29.  
(i) In conduction, matter is not transported with heat; while in convection, matter is 
transported with the heat. 
(ii) Convection takes more heat upwards. Towards the top, the air gets heated by 
convection. Therefore, the hand above the flame feels hot. On the sides, however, 
there is no convection and air does not feel as hot as at the top. 
 
30.  
(a) If an object is placed at a distance of 10 cm in front of a plane mirror, it would be 20 
cm away from its image since the image formed is at the same distance from the 
mirror as the object is in front of it. 
(b) Each colour of white light travels at a different speed in glass. This results in 
different colours of light being refracted at different angles. 
 
31.  
(a) The needle in a magnetic compass is a tiny magnet which points in the north-south 
direction. 
(b) Some electrical appliances have elements in them. When they are switched on after 
connecting to the electric supply, their elements becomes red hot and give out heat. 
 
 
SECTION D 
 
32.  
(a)  
 
(b) Haemoglobin, the red pigment of blood, binds with oxygen and transports it to all 
the parts of the body and ultimately to all the cells. It is present in the red blood cells  
of blood 
 
  
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