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

Science Class 7

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

 Page 1


  
 
CBSE VII  |  SCIENCE 
Sample Paper – 2 Solution 
 
     
CBSE 
Class VII Science 
Term 1 
Sample Paper – 2 Solution 
Time: 2 ½ hrs Total Marks: 80 
 
SECTION A 
1. Ans. Correct Option: [B] 
Solution: The pulp cavity contains nerves and blood vessels. 
 
2. Ans. Correct Option: [A] 
Solution: Respiration in earthworm takes place through the skin. 
 
3. Ans. Correct Option: [A] 
Solution: Summer monsoon winds are monsoon winds which bring rainfall over 
India. 
 
4. Ans. Correct Option: [C] 
Solution: The layer of the B horizon is hard and compact. It is rich in minerals. 
 
5. Ans. Correct Option: [D] 
Solution: The silk moth cuts open the cocoon at the end of the pupal stage. During 
the pupal stage, the caterpillar is enclosed in the hard shell of silk fibres called the 
cocoon. 
 
6. Ans. Correct Option: [C] 
Solution: Llama and Alpaca yield wool in South America. 
 
7. Ans. Correct Option: [A] 
Solution: This picture shows scouring by machine. Scouring involves the thorough 
washing of the sheared skin to remove grease, dust and dirt. 
 
8.  Ans. Correct Option: [C] 
 Solution: Lime water contains calcium hydroxide which is a base. Bases are bitter  
 in taste. 
 
9.  Ans. Correct Option: [C] 
 Solution: Soda water is basic in nature. Bases change the colour of China rose  
 indicator to green. 
 
Page 2


  
 
CBSE VII  |  SCIENCE 
Sample Paper – 2 Solution 
 
     
CBSE 
Class VII Science 
Term 1 
Sample Paper – 2 Solution 
Time: 2 ½ hrs Total Marks: 80 
 
SECTION A 
1. Ans. Correct Option: [B] 
Solution: The pulp cavity contains nerves and blood vessels. 
 
2. Ans. Correct Option: [A] 
Solution: Respiration in earthworm takes place through the skin. 
 
3. Ans. Correct Option: [A] 
Solution: Summer monsoon winds are monsoon winds which bring rainfall over 
India. 
 
4. Ans. Correct Option: [C] 
Solution: The layer of the B horizon is hard and compact. It is rich in minerals. 
 
5. Ans. Correct Option: [D] 
Solution: The silk moth cuts open the cocoon at the end of the pupal stage. During 
the pupal stage, the caterpillar is enclosed in the hard shell of silk fibres called the 
cocoon. 
 
6. Ans. Correct Option: [C] 
Solution: Llama and Alpaca yield wool in South America. 
 
7. Ans. Correct Option: [A] 
Solution: This picture shows scouring by machine. Scouring involves the thorough 
washing of the sheared skin to remove grease, dust and dirt. 
 
8.  Ans. Correct Option: [C] 
 Solution: Lime water contains calcium hydroxide which is a base. Bases are bitter  
 in taste. 
 
9.  Ans. Correct Option: [C] 
 Solution: Soda water is basic in nature. Bases change the colour of China rose  
 indicator to green. 
 
  
 
CBSE VII  |  SCIENCE 
Sample Paper – 2 Solution 
 
     
10.  Ans. Correct Option: [B] 
 Solution: The air from the land towards the sea is called land breeze. 
 
11. Ans. Correct Option: [A] 
Solution: While reading a thermometer, we should not hold it by the bulb. 
 
12.  Ans. Correct Option: [B] 
 Solution: The bulb in the thermometer has mercury. 
 
13.  Ans. Correct Option: [C] 
 Solution: One of the most well-known periodic motions is that of a simple  
      pendulum. 
 
14.  Ans. Correct Option: [A] 
 Solution: Speed = Distance travelled/Time 
 Thus, in case of A, in the same amount of time, the distance travelled is more as  
 compared to that of B. 
 
15.  Ans. Correct Option: [B] 
 Solution: The speed is zero if the graph is a straight line parallel to the time axis. 
 
 
SECTION B 
 
16. Ans. Leguminous crops have root nodules which contain Rhizobium. Rhizobia 
convert atmospheric nitrogen into nitrates. These nitrates mix with the soil and 
enrich it. Thus, the soil gets enriched with nitrogen compounds. 
 
17. Ans. The topsoil is rich in humus and minerals. It is the home for many living things 
such as earthworms. It also contains decayed plant and animal remains. The 
presence of minerals, living things and decaying plant and animal remains makes 
the top soil fertile.  
 
18. Ans. Yeasts are single-celled fungi. They respire anaerobically, i.e. they convert 
glucose into alcohol in the absence of oxygen. 
 
19. Ans.  
1. Shearing is done only once in a year generally during the hot weather in 
summer. 
2. During shearing, the layer of hair along with a thin layer of skin which is dead is 
removed. Hence, it does not hurt the sheep.  
 
Page 3


  
 
CBSE VII  |  SCIENCE 
Sample Paper – 2 Solution 
 
     
CBSE 
Class VII Science 
Term 1 
Sample Paper – 2 Solution 
Time: 2 ½ hrs Total Marks: 80 
 
SECTION A 
1. Ans. Correct Option: [B] 
Solution: The pulp cavity contains nerves and blood vessels. 
 
2. Ans. Correct Option: [A] 
Solution: Respiration in earthworm takes place through the skin. 
 
3. Ans. Correct Option: [A] 
Solution: Summer monsoon winds are monsoon winds which bring rainfall over 
India. 
 
4. Ans. Correct Option: [C] 
Solution: The layer of the B horizon is hard and compact. It is rich in minerals. 
 
5. Ans. Correct Option: [D] 
Solution: The silk moth cuts open the cocoon at the end of the pupal stage. During 
the pupal stage, the caterpillar is enclosed in the hard shell of silk fibres called the 
cocoon. 
 
6. Ans. Correct Option: [C] 
Solution: Llama and Alpaca yield wool in South America. 
 
7. Ans. Correct Option: [A] 
Solution: This picture shows scouring by machine. Scouring involves the thorough 
washing of the sheared skin to remove grease, dust and dirt. 
 
8.  Ans. Correct Option: [C] 
 Solution: Lime water contains calcium hydroxide which is a base. Bases are bitter  
 in taste. 
 
9.  Ans. Correct Option: [C] 
 Solution: Soda water is basic in nature. Bases change the colour of China rose  
 indicator to green. 
 
  
 
CBSE VII  |  SCIENCE 
Sample Paper – 2 Solution 
 
     
10.  Ans. Correct Option: [B] 
 Solution: The air from the land towards the sea is called land breeze. 
 
11. Ans. Correct Option: [A] 
Solution: While reading a thermometer, we should not hold it by the bulb. 
 
12.  Ans. Correct Option: [B] 
 Solution: The bulb in the thermometer has mercury. 
 
13.  Ans. Correct Option: [C] 
 Solution: One of the most well-known periodic motions is that of a simple  
      pendulum. 
 
14.  Ans. Correct Option: [A] 
 Solution: Speed = Distance travelled/Time 
 Thus, in case of A, in the same amount of time, the distance travelled is more as  
 compared to that of B. 
 
15.  Ans. Correct Option: [B] 
 Solution: The speed is zero if the graph is a straight line parallel to the time axis. 
 
 
SECTION B 
 
16. Ans. Leguminous crops have root nodules which contain Rhizobium. Rhizobia 
convert atmospheric nitrogen into nitrates. These nitrates mix with the soil and 
enrich it. Thus, the soil gets enriched with nitrogen compounds. 
 
17. Ans. The topsoil is rich in humus and minerals. It is the home for many living things 
such as earthworms. It also contains decayed plant and animal remains. The 
presence of minerals, living things and decaying plant and animal remains makes 
the top soil fertile.  
 
18. Ans. Yeasts are single-celled fungi. They respire anaerobically, i.e. they convert 
glucose into alcohol in the absence of oxygen. 
 
19. Ans.  
1. Shearing is done only once in a year generally during the hot weather in 
summer. 
2. During shearing, the layer of hair along with a thin layer of skin which is dead is 
removed. Hence, it does not hurt the sheep.  
 
  
 
CBSE VII  |  SCIENCE 
Sample Paper – 2 Solution 
 
     
20. Ans.  
 
Type of fibre Burning smell 
Artificial silk Smell of burning paper 
Natural silk Smell of burning hair 
 
21. Ans. No. The range of a clinical thermometer is 35°C to 42°C, while the boiling 
      temperature is far more than 42°C. 
 
22. Ans.  
(i) A bike moving with a constant speed: 
 
 
 
(ii) A car parked on the road side: 
 
 
 
 
 
 
 
 
  
Page 4


  
 
CBSE VII  |  SCIENCE 
Sample Paper – 2 Solution 
 
     
CBSE 
Class VII Science 
Term 1 
Sample Paper – 2 Solution 
Time: 2 ½ hrs Total Marks: 80 
 
SECTION A 
1. Ans. Correct Option: [B] 
Solution: The pulp cavity contains nerves and blood vessels. 
 
2. Ans. Correct Option: [A] 
Solution: Respiration in earthworm takes place through the skin. 
 
3. Ans. Correct Option: [A] 
Solution: Summer monsoon winds are monsoon winds which bring rainfall over 
India. 
 
4. Ans. Correct Option: [C] 
Solution: The layer of the B horizon is hard and compact. It is rich in minerals. 
 
5. Ans. Correct Option: [D] 
Solution: The silk moth cuts open the cocoon at the end of the pupal stage. During 
the pupal stage, the caterpillar is enclosed in the hard shell of silk fibres called the 
cocoon. 
 
6. Ans. Correct Option: [C] 
Solution: Llama and Alpaca yield wool in South America. 
 
7. Ans. Correct Option: [A] 
Solution: This picture shows scouring by machine. Scouring involves the thorough 
washing of the sheared skin to remove grease, dust and dirt. 
 
8.  Ans. Correct Option: [C] 
 Solution: Lime water contains calcium hydroxide which is a base. Bases are bitter  
 in taste. 
 
9.  Ans. Correct Option: [C] 
 Solution: Soda water is basic in nature. Bases change the colour of China rose  
 indicator to green. 
 
  
 
CBSE VII  |  SCIENCE 
Sample Paper – 2 Solution 
 
     
10.  Ans. Correct Option: [B] 
 Solution: The air from the land towards the sea is called land breeze. 
 
11. Ans. Correct Option: [A] 
Solution: While reading a thermometer, we should not hold it by the bulb. 
 
12.  Ans. Correct Option: [B] 
 Solution: The bulb in the thermometer has mercury. 
 
13.  Ans. Correct Option: [C] 
 Solution: One of the most well-known periodic motions is that of a simple  
      pendulum. 
 
14.  Ans. Correct Option: [A] 
 Solution: Speed = Distance travelled/Time 
 Thus, in case of A, in the same amount of time, the distance travelled is more as  
 compared to that of B. 
 
15.  Ans. Correct Option: [B] 
 Solution: The speed is zero if the graph is a straight line parallel to the time axis. 
 
 
SECTION B 
 
16. Ans. Leguminous crops have root nodules which contain Rhizobium. Rhizobia 
convert atmospheric nitrogen into nitrates. These nitrates mix with the soil and 
enrich it. Thus, the soil gets enriched with nitrogen compounds. 
 
17. Ans. The topsoil is rich in humus and minerals. It is the home for many living things 
such as earthworms. It also contains decayed plant and animal remains. The 
presence of minerals, living things and decaying plant and animal remains makes 
the top soil fertile.  
 
18. Ans. Yeasts are single-celled fungi. They respire anaerobically, i.e. they convert 
glucose into alcohol in the absence of oxygen. 
 
19. Ans.  
1. Shearing is done only once in a year generally during the hot weather in 
summer. 
2. During shearing, the layer of hair along with a thin layer of skin which is dead is 
removed. Hence, it does not hurt the sheep.  
 
  
 
CBSE VII  |  SCIENCE 
Sample Paper – 2 Solution 
 
     
20. Ans.  
 
Type of fibre Burning smell 
Artificial silk Smell of burning paper 
Natural silk Smell of burning hair 
 
21. Ans. No. The range of a clinical thermometer is 35°C to 42°C, while the boiling 
      temperature is far more than 42°C. 
 
22. Ans.  
(i) A bike moving with a constant speed: 
 
 
 
(ii) A car parked on the road side: 
 
 
 
 
 
 
 
 
  
  
 
CBSE VII  |  SCIENCE 
Sample Paper – 2 Solution 
 
     
SECTION C 
 
23. Ans.  
(i) Amoeba: 
 
 
 
(ii) Pseudopodia help amoeba in capturing of food and in movement. During feeding, 
amoeba produces two pseudopodia which surround the food particle. The two 
pseudopodia join and trap the food particle inside the body. 
 
24. Ans.  
(i) The trunk is helpful to elephants in the following ways: 
1. It imparts a strong sense of smell to elephants. 
2. It helps them to spray water on their back to keep them clean and cool. 
3. Elephants breathe with the help of the trunk. 
4. Elephants grasp their food and suck water with the help of their trunk. 
 
(ii) Adaptations which help penguins to live in polar regions are as follows: 
1. Penguins have thick skin and a layer of fat under the skin. 
2. Penguins huddle together to make themselves warm. 
 
25. Ans.  
(i) Sand in deserts has a  poor water-holding capacity. Because water is the most 
essential component required for plant growth, few plantations are found in the 
desert. 
 
(ii) Clay has the smallest sized particles, i.e. less than 0.002 mm. Due to the small 
particle size, intermolecular spaces are  small. Hence, the soil is not aerated. Its 
water-absorbing and water-retaining capacity is  high; thus, it becomes 
waterlogged. For the growth of plants, it is important that the soil is well aerated 
and there is no water logging. Hence, clay soil is not suitable for plant growth. 
 
Page 5


  
 
CBSE VII  |  SCIENCE 
Sample Paper – 2 Solution 
 
     
CBSE 
Class VII Science 
Term 1 
Sample Paper – 2 Solution 
Time: 2 ½ hrs Total Marks: 80 
 
SECTION A 
1. Ans. Correct Option: [B] 
Solution: The pulp cavity contains nerves and blood vessels. 
 
2. Ans. Correct Option: [A] 
Solution: Respiration in earthworm takes place through the skin. 
 
3. Ans. Correct Option: [A] 
Solution: Summer monsoon winds are monsoon winds which bring rainfall over 
India. 
 
4. Ans. Correct Option: [C] 
Solution: The layer of the B horizon is hard and compact. It is rich in minerals. 
 
5. Ans. Correct Option: [D] 
Solution: The silk moth cuts open the cocoon at the end of the pupal stage. During 
the pupal stage, the caterpillar is enclosed in the hard shell of silk fibres called the 
cocoon. 
 
6. Ans. Correct Option: [C] 
Solution: Llama and Alpaca yield wool in South America. 
 
7. Ans. Correct Option: [A] 
Solution: This picture shows scouring by machine. Scouring involves the thorough 
washing of the sheared skin to remove grease, dust and dirt. 
 
8.  Ans. Correct Option: [C] 
 Solution: Lime water contains calcium hydroxide which is a base. Bases are bitter  
 in taste. 
 
9.  Ans. Correct Option: [C] 
 Solution: Soda water is basic in nature. Bases change the colour of China rose  
 indicator to green. 
 
  
 
CBSE VII  |  SCIENCE 
Sample Paper – 2 Solution 
 
     
10.  Ans. Correct Option: [B] 
 Solution: The air from the land towards the sea is called land breeze. 
 
11. Ans. Correct Option: [A] 
Solution: While reading a thermometer, we should not hold it by the bulb. 
 
12.  Ans. Correct Option: [B] 
 Solution: The bulb in the thermometer has mercury. 
 
13.  Ans. Correct Option: [C] 
 Solution: One of the most well-known periodic motions is that of a simple  
      pendulum. 
 
14.  Ans. Correct Option: [A] 
 Solution: Speed = Distance travelled/Time 
 Thus, in case of A, in the same amount of time, the distance travelled is more as  
 compared to that of B. 
 
15.  Ans. Correct Option: [B] 
 Solution: The speed is zero if the graph is a straight line parallel to the time axis. 
 
 
SECTION B 
 
16. Ans. Leguminous crops have root nodules which contain Rhizobium. Rhizobia 
convert atmospheric nitrogen into nitrates. These nitrates mix with the soil and 
enrich it. Thus, the soil gets enriched with nitrogen compounds. 
 
17. Ans. The topsoil is rich in humus and minerals. It is the home for many living things 
such as earthworms. It also contains decayed plant and animal remains. The 
presence of minerals, living things and decaying plant and animal remains makes 
the top soil fertile.  
 
18. Ans. Yeasts are single-celled fungi. They respire anaerobically, i.e. they convert 
glucose into alcohol in the absence of oxygen. 
 
19. Ans.  
1. Shearing is done only once in a year generally during the hot weather in 
summer. 
2. During shearing, the layer of hair along with a thin layer of skin which is dead is 
removed. Hence, it does not hurt the sheep.  
 
  
 
CBSE VII  |  SCIENCE 
Sample Paper – 2 Solution 
 
     
20. Ans.  
 
Type of fibre Burning smell 
Artificial silk Smell of burning paper 
Natural silk Smell of burning hair 
 
21. Ans. No. The range of a clinical thermometer is 35°C to 42°C, while the boiling 
      temperature is far more than 42°C. 
 
22. Ans.  
(i) A bike moving with a constant speed: 
 
 
 
(ii) A car parked on the road side: 
 
 
 
 
 
 
 
 
  
  
 
CBSE VII  |  SCIENCE 
Sample Paper – 2 Solution 
 
     
SECTION C 
 
23. Ans.  
(i) Amoeba: 
 
 
 
(ii) Pseudopodia help amoeba in capturing of food and in movement. During feeding, 
amoeba produces two pseudopodia which surround the food particle. The two 
pseudopodia join and trap the food particle inside the body. 
 
24. Ans.  
(i) The trunk is helpful to elephants in the following ways: 
1. It imparts a strong sense of smell to elephants. 
2. It helps them to spray water on their back to keep them clean and cool. 
3. Elephants breathe with the help of the trunk. 
4. Elephants grasp their food and suck water with the help of their trunk. 
 
(ii) Adaptations which help penguins to live in polar regions are as follows: 
1. Penguins have thick skin and a layer of fat under the skin. 
2. Penguins huddle together to make themselves warm. 
 
25. Ans.  
(i) Sand in deserts has a  poor water-holding capacity. Because water is the most 
essential component required for plant growth, few plantations are found in the 
desert. 
 
(ii) Clay has the smallest sized particles, i.e. less than 0.002 mm. Due to the small 
particle size, intermolecular spaces are  small. Hence, the soil is not aerated. Its 
water-absorbing and water-retaining capacity is  high; thus, it becomes 
waterlogged. For the growth of plants, it is important that the soil is well aerated 
and there is no water logging. Hence, clay soil is not suitable for plant growth. 
 
  
 
CBSE VII  |  SCIENCE 
Sample Paper – 2 Solution 
 
     
26. Ans.  
(i) A – Trachea 
B – Diaphragm 
(ii)  During inhalation, we take about 21% oxygen and 0.04% carbon dioxide in our 
lungs. During exhalation, 16.4% oxygen and 4.4% carbon dioxide is taken out of 
the lungs. 
 
27. Ans.  
(i) An indicator is a dye which changes colour when it is put into an acid or a base. 
(ii) Put one drop of each liquid on turmeric paper, turn by turn. 
1. The liquid which turns the yellow turmeric paper red will be sodium 
hydroxide (base). The red turmeric paper formed here can now be used to 
test sulphuric acid. 
2. Put one drop each of the remaining two liquids on red turmeric paper. The 
liquid which makes the red turmeric paper yellow again will be sulphuric 
acid. This is because sulphuric acid cancels the effect of the sodium 
hydroxide base on turmeric paper. 
3. The liquid which has no effect on the red-turned turmeric paper will be salt 
solution because it is neutral. 
 
28. Ans.  
(i) A salt is a substance formed by the reaction of an acid with a base. 
(ii) Salts can be of three types:  
1. Neutral salts: Salts which form a neutral solution on dissolving in water are 
called neutral salts. The salts formed by the neutralisation of a strong acid by 
a strong base are neutral salts. Example: Sodium chloride (NaCl) 
2. Acidic salts: Salts which form an acidic solution on dissolving in water are 
called acidic salts. The salts formed by the neutralisation of a strong acid with 
a weak base are acidic salts. Example: Ammonium chloride (NH 4Cl) 
3. Basic salts: Salts which form basic solutions on dissolving in water are called 
basic salts. The salts formed by the neutralisation of weak acids with strong 
bases are basic salts. Example: Sodium carbonate (Na 2CO 3) 
 
29. Ans.  
(i) When one end of a wooden spoon is dipped in a cup of ice cream, there will be no 
change in the temperature of its other end. Wood is a bad conductor of heat, so 
there will be no flow of heat from one end to the other. 
(ii) The material of a pan is a good conductor of heat. So, a handle of wood (which is 
a bad conductor of heat) is used in a frying pan so that it does not get heated by 
conduction. 
 
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