Class 10 Science: CBSE Sample Question Paper (2019-20) - 11 | CBSE Sample Papers For Class 10 PDF Download

 Page 1


1	 	
	
Central	Board	of	Secondary	Education	 Central	Board	of	Secondary	Education	
		
Class-X 
Science-086 
SAMPLE QUESTION PAPER 2019-20 
TIME: 3 Hrs.         M.M.: 80  
  
General Instructions:  
1.   The question paper comprises three sections – A, B and C. Attempt all the sections. 
2.   All questions are compulsory. 
3.   Internal choice is given in each section.  
4.  All questions in Section A are one-mark questions comprising MCQ, VSA type and 
assertion-reason type questions. They are to be answered in one word or in one sentence.	
5.  All questions in Section B are three-mark, short-answer type questions. These are to be 
answered in about 50 - 60 words each.	
6. All questions in Section C are five-mark, long-answer type questions. These are to be 
answered in about 80 – 90 words each.	
7.  This question paper consists of a total of 30 questions.	
 
 
SECTION A 
 
1 Define catenation. 1 
2 How does valency of an element vary across a period?  1 
3 Answer question numbers 3(a) - 3(d) on the basis of your understanding of the 
following paragraph and the related studied concepts.	
Renewable energy sources such as wind energy are vital for the Indian economy, not only 
from the point of view of supply, but also from the perspective of environmental and 
social benefits. India is the world’s fifth largest wind-power producer and the largest 
windmill facilities in India are installed in Tamil Nadu. Muppandal is a small village of 
Tamil Nadu and one of the most important sites of wind-farm in the state. It uses wind 
from the Arabian Sea to produce renewable energy. The suitability of Muppandal as a site 
for wind farms stems from its geographical location as it has access to the seasonal 
monsoon winds.  
The electrical generators used on wind turbines in sites like Muppandal, produce an 
output AC of 240 V and a frequency of 50 Hz even when the wind speed is fluctuating. A 
 
Page 2


1	 	
	
Central	Board	of	Secondary	Education	 Central	Board	of	Secondary	Education	
		
Class-X 
Science-086 
SAMPLE QUESTION PAPER 2019-20 
TIME: 3 Hrs.         M.M.: 80  
  
General Instructions:  
1.   The question paper comprises three sections – A, B and C. Attempt all the sections. 
2.   All questions are compulsory. 
3.   Internal choice is given in each section.  
4.  All questions in Section A are one-mark questions comprising MCQ, VSA type and 
assertion-reason type questions. They are to be answered in one word or in one sentence.	
5.  All questions in Section B are three-mark, short-answer type questions. These are to be 
answered in about 50 - 60 words each.	
6. All questions in Section C are five-mark, long-answer type questions. These are to be 
answered in about 80 – 90 words each.	
7.  This question paper consists of a total of 30 questions.	
 
 
SECTION A 
 
1 Define catenation. 1 
2 How does valency of an element vary across a period?  1 
3 Answer question numbers 3(a) - 3(d) on the basis of your understanding of the 
following paragraph and the related studied concepts.	
Renewable energy sources such as wind energy are vital for the Indian economy, not only 
from the point of view of supply, but also from the perspective of environmental and 
social benefits. India is the world’s fifth largest wind-power producer and the largest 
windmill facilities in India are installed in Tamil Nadu. Muppandal is a small village of 
Tamil Nadu and one of the most important sites of wind-farm in the state. It uses wind 
from the Arabian Sea to produce renewable energy. The suitability of Muppandal as a site 
for wind farms stems from its geographical location as it has access to the seasonal 
monsoon winds.  
The electrical generators used on wind turbines in sites like Muppandal, produce an 
output AC of 240 V and a frequency of 50 Hz even when the wind speed is fluctuating. A 
 
2	 	
	
Central	Board	of	Secondary	Education	 Central	Board	of	Secondary	Education	
		
transformer may be required to increase or decrease the voltage so it is compatible with 
the end usage, distribution or transmission voltage, depending on the type of 
interconnection. 
3(a)	 State the principle behind electric generator. 1 
3(b)	 The output frequency of wind turbine is 50 Hz. What is meant by this statement? 1 
3(c)	 Why do you think Muppandal is at an advantageous position for this project? 1 
3(d)	 Based on the data represented in the graph below, which of the two cities A or B would be 
an ideal location for establishing a wind-farm and why?   
 
1 
4 Question numbers 4(a) - 4(d) are based on the two tables given below. Study these 
tables related to blood sugar levels and answer the questions that follow.	
	
Table A (Blood glucose chart) 
 Mean Blood Glucose Level (mg/dL) 
Doctor’s advice 
needed 
380 
350 
315 
280 
250 
215 
Good  180 
150 
Excellent  115 
80 
50 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Page 3


1	 	
	
Central	Board	of	Secondary	Education	 Central	Board	of	Secondary	Education	
		
Class-X 
Science-086 
SAMPLE QUESTION PAPER 2019-20 
TIME: 3 Hrs.         M.M.: 80  
  
General Instructions:  
1.   The question paper comprises three sections – A, B and C. Attempt all the sections. 
2.   All questions are compulsory. 
3.   Internal choice is given in each section.  
4.  All questions in Section A are one-mark questions comprising MCQ, VSA type and 
assertion-reason type questions. They are to be answered in one word or in one sentence.	
5.  All questions in Section B are three-mark, short-answer type questions. These are to be 
answered in about 50 - 60 words each.	
6. All questions in Section C are five-mark, long-answer type questions. These are to be 
answered in about 80 – 90 words each.	
7.  This question paper consists of a total of 30 questions.	
 
 
SECTION A 
 
1 Define catenation. 1 
2 How does valency of an element vary across a period?  1 
3 Answer question numbers 3(a) - 3(d) on the basis of your understanding of the 
following paragraph and the related studied concepts.	
Renewable energy sources such as wind energy are vital for the Indian economy, not only 
from the point of view of supply, but also from the perspective of environmental and 
social benefits. India is the world’s fifth largest wind-power producer and the largest 
windmill facilities in India are installed in Tamil Nadu. Muppandal is a small village of 
Tamil Nadu and one of the most important sites of wind-farm in the state. It uses wind 
from the Arabian Sea to produce renewable energy. The suitability of Muppandal as a site 
for wind farms stems from its geographical location as it has access to the seasonal 
monsoon winds.  
The electrical generators used on wind turbines in sites like Muppandal, produce an 
output AC of 240 V and a frequency of 50 Hz even when the wind speed is fluctuating. A 
 
2	 	
	
Central	Board	of	Secondary	Education	 Central	Board	of	Secondary	Education	
		
transformer may be required to increase or decrease the voltage so it is compatible with 
the end usage, distribution or transmission voltage, depending on the type of 
interconnection. 
3(a)	 State the principle behind electric generator. 1 
3(b)	 The output frequency of wind turbine is 50 Hz. What is meant by this statement? 1 
3(c)	 Why do you think Muppandal is at an advantageous position for this project? 1 
3(d)	 Based on the data represented in the graph below, which of the two cities A or B would be 
an ideal location for establishing a wind-farm and why?   
 
1 
4 Question numbers 4(a) - 4(d) are based on the two tables given below. Study these 
tables related to blood sugar levels and answer the questions that follow.	
	
Table A (Blood glucose chart) 
 Mean Blood Glucose Level (mg/dL) 
Doctor’s advice 
needed 
380 
350 
315 
280 
250 
215 
Good  180 
150 
Excellent  115 
80 
50 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3	 	
	
Central	Board	of	Secondary	Education	 Central	Board	of	Secondary	Education	
		
Table B (Blood Report of Patient X and Y) 
Time of check  Blood Glucose ranges (mg/dL) 
 Patient X Patient Y 
Before breakfast (Fasting) < 100 70 – 130 
Before lunch, supper and 
snack 
< 110 70 – 130 
Two hours after meals < 140 < 180 
Bedtime < 120 90- 15 
 
 
 
 
 
 
 
 
 
 
 
4(a)	 Refer to Table B showing the blood report of the levels of glucose of patients X and Y. 
Infer the disease which can be diagnosed from the given data.	
1 
4(b)	 Identify the hormone whose level in the blood is responsible for the above disease. 1 
4(c)	 Which one of the following diets would you recommended to the affected patient? 
i) High sugar and low fat diet.	
ii) Low sugar and high protein diet.	
iii) High Fat and low fiber diet.	
iv) Low sugar and high fiber diet.	
1 
4(d)	 Refer to the Table A and suggest the value of the mean blood glucose level beyond which 
doctor’s advice is necessary: 
i) 180 mg/dL 
ii) 115 mg/dL 
iii) 50 mg/dL 
iv) 80 mg/dL 
 
1 
5	 When we enter a dark room coming from outside, immediately the things inside the room 
do not appear clear to our eyes. This is because 
i) pupils do not open at all in the dark. 
ii) pupils take time to adjust. 
iii) light travels slower in a dark room. 
iv) pupils open very quickly in the dark. 
OR 
The phenomena of light responsible for the working of the human eye is 
 i)   reflection 
 ii)  refraction 
 iii) power of accommodation 
 iv) persistence of vision 
1 
  1 
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1	 	
	
Central	Board	of	Secondary	Education	 Central	Board	of	Secondary	Education	
		
Class-X 
Science-086 
SAMPLE QUESTION PAPER 2019-20 
TIME: 3 Hrs.         M.M.: 80  
  
General Instructions:  
1.   The question paper comprises three sections – A, B and C. Attempt all the sections. 
2.   All questions are compulsory. 
3.   Internal choice is given in each section.  
4.  All questions in Section A are one-mark questions comprising MCQ, VSA type and 
assertion-reason type questions. They are to be answered in one word or in one sentence.	
5.  All questions in Section B are three-mark, short-answer type questions. These are to be 
answered in about 50 - 60 words each.	
6. All questions in Section C are five-mark, long-answer type questions. These are to be 
answered in about 80 – 90 words each.	
7.  This question paper consists of a total of 30 questions.	
 
 
SECTION A 
 
1 Define catenation. 1 
2 How does valency of an element vary across a period?  1 
3 Answer question numbers 3(a) - 3(d) on the basis of your understanding of the 
following paragraph and the related studied concepts.	
Renewable energy sources such as wind energy are vital for the Indian economy, not only 
from the point of view of supply, but also from the perspective of environmental and 
social benefits. India is the world’s fifth largest wind-power producer and the largest 
windmill facilities in India are installed in Tamil Nadu. Muppandal is a small village of 
Tamil Nadu and one of the most important sites of wind-farm in the state. It uses wind 
from the Arabian Sea to produce renewable energy. The suitability of Muppandal as a site 
for wind farms stems from its geographical location as it has access to the seasonal 
monsoon winds.  
The electrical generators used on wind turbines in sites like Muppandal, produce an 
output AC of 240 V and a frequency of 50 Hz even when the wind speed is fluctuating. A 
 
2	 	
	
Central	Board	of	Secondary	Education	 Central	Board	of	Secondary	Education	
		
transformer may be required to increase or decrease the voltage so it is compatible with 
the end usage, distribution or transmission voltage, depending on the type of 
interconnection. 
3(a)	 State the principle behind electric generator. 1 
3(b)	 The output frequency of wind turbine is 50 Hz. What is meant by this statement? 1 
3(c)	 Why do you think Muppandal is at an advantageous position for this project? 1 
3(d)	 Based on the data represented in the graph below, which of the two cities A or B would be 
an ideal location for establishing a wind-farm and why?   
 
1 
4 Question numbers 4(a) - 4(d) are based on the two tables given below. Study these 
tables related to blood sugar levels and answer the questions that follow.	
	
Table A (Blood glucose chart) 
 Mean Blood Glucose Level (mg/dL) 
Doctor’s advice 
needed 
380 
350 
315 
280 
250 
215 
Good  180 
150 
Excellent  115 
80 
50 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3	 	
	
Central	Board	of	Secondary	Education	 Central	Board	of	Secondary	Education	
		
Table B (Blood Report of Patient X and Y) 
Time of check  Blood Glucose ranges (mg/dL) 
 Patient X Patient Y 
Before breakfast (Fasting) < 100 70 – 130 
Before lunch, supper and 
snack 
< 110 70 – 130 
Two hours after meals < 140 < 180 
Bedtime < 120 90- 15 
 
 
 
 
 
 
 
 
 
 
 
4(a)	 Refer to Table B showing the blood report of the levels of glucose of patients X and Y. 
Infer the disease which can be diagnosed from the given data.	
1 
4(b)	 Identify the hormone whose level in the blood is responsible for the above disease. 1 
4(c)	 Which one of the following diets would you recommended to the affected patient? 
i) High sugar and low fat diet.	
ii) Low sugar and high protein diet.	
iii) High Fat and low fiber diet.	
iv) Low sugar and high fiber diet.	
1 
4(d)	 Refer to the Table A and suggest the value of the mean blood glucose level beyond which 
doctor’s advice is necessary: 
i) 180 mg/dL 
ii) 115 mg/dL 
iii) 50 mg/dL 
iv) 80 mg/dL 
 
1 
5	 When we enter a dark room coming from outside, immediately the things inside the room 
do not appear clear to our eyes. This is because 
i) pupils do not open at all in the dark. 
ii) pupils take time to adjust. 
iii) light travels slower in a dark room. 
iv) pupils open very quickly in the dark. 
OR 
The phenomena of light responsible for the working of the human eye is 
 i)   reflection 
 ii)  refraction 
 iii) power of accommodation 
 iv) persistence of vision 
1 
  1 
4	 	
	
Central	Board	of	Secondary	Education	 Central	Board	of	Secondary	Education	
		
 
6	
 
When a 4V battery is connected across an unknown resistor there is a current of 100 mA 
in the circuit. The value of the resistance of the resister is: 
i)    4 O            
ii)   40 O            
iii)  400 O          
iv)  0.4 O 
7	 Unit of electric power may also be expressed as:  
i) volt-ampere      
ii) kilowatt-hour 
iii) watt-second 
iv) joule-second 
1 
8	 It was found that water from a river was contaminated with Coliform bacteria. Which one 
of the following pollutant might have got mixed with the water?                                                                
i) Fertilizer run off 
ii) Industrial waste 
iii) Pesticides 
iv) Human faecal matter 
OR 
Which one of the following stakeholders of forests causes the maximum damage to 
forest? 
i) People who live in or around the forest 
ii) The forest department of the government 
iii) The wildlife and native enthusiasts 
iv) The industrialists  
1 
9	 Which one of the following green house gases is a contributor due to incomplete 
combustion of coal and petroleum? 
i) Oxides of nitrogen 	
ii) Methane 	
iii) Carbon monoxide 	
iv) Carbon dioxide	
1 
10	 Which of the following reactions is an endothermic reaction? 
i) Burning of coal. 
ii) Decomposition of vegetable matter into compost.  
iii) Process of respiration.  
iv) Decomposition of calcium carbonate to form quick lime and carbon dioxide. 
1 
11	 Identify the basic salt from the following salts: 
i) Na
2
CO
3
 
1 
Page 5


1	 	
	
Central	Board	of	Secondary	Education	 Central	Board	of	Secondary	Education	
		
Class-X 
Science-086 
SAMPLE QUESTION PAPER 2019-20 
TIME: 3 Hrs.         M.M.: 80  
  
General Instructions:  
1.   The question paper comprises three sections – A, B and C. Attempt all the sections. 
2.   All questions are compulsory. 
3.   Internal choice is given in each section.  
4.  All questions in Section A are one-mark questions comprising MCQ, VSA type and 
assertion-reason type questions. They are to be answered in one word or in one sentence.	
5.  All questions in Section B are three-mark, short-answer type questions. These are to be 
answered in about 50 - 60 words each.	
6. All questions in Section C are five-mark, long-answer type questions. These are to be 
answered in about 80 – 90 words each.	
7.  This question paper consists of a total of 30 questions.	
 
 
SECTION A 
 
1 Define catenation. 1 
2 How does valency of an element vary across a period?  1 
3 Answer question numbers 3(a) - 3(d) on the basis of your understanding of the 
following paragraph and the related studied concepts.	
Renewable energy sources such as wind energy are vital for the Indian economy, not only 
from the point of view of supply, but also from the perspective of environmental and 
social benefits. India is the world’s fifth largest wind-power producer and the largest 
windmill facilities in India are installed in Tamil Nadu. Muppandal is a small village of 
Tamil Nadu and one of the most important sites of wind-farm in the state. It uses wind 
from the Arabian Sea to produce renewable energy. The suitability of Muppandal as a site 
for wind farms stems from its geographical location as it has access to the seasonal 
monsoon winds.  
The electrical generators used on wind turbines in sites like Muppandal, produce an 
output AC of 240 V and a frequency of 50 Hz even when the wind speed is fluctuating. A 
 
2	 	
	
Central	Board	of	Secondary	Education	 Central	Board	of	Secondary	Education	
		
transformer may be required to increase or decrease the voltage so it is compatible with 
the end usage, distribution or transmission voltage, depending on the type of 
interconnection. 
3(a)	 State the principle behind electric generator. 1 
3(b)	 The output frequency of wind turbine is 50 Hz. What is meant by this statement? 1 
3(c)	 Why do you think Muppandal is at an advantageous position for this project? 1 
3(d)	 Based on the data represented in the graph below, which of the two cities A or B would be 
an ideal location for establishing a wind-farm and why?   
 
1 
4 Question numbers 4(a) - 4(d) are based on the two tables given below. Study these 
tables related to blood sugar levels and answer the questions that follow.	
	
Table A (Blood glucose chart) 
 Mean Blood Glucose Level (mg/dL) 
Doctor’s advice 
needed 
380 
350 
315 
280 
250 
215 
Good  180 
150 
Excellent  115 
80 
50 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3	 	
	
Central	Board	of	Secondary	Education	 Central	Board	of	Secondary	Education	
		
Table B (Blood Report of Patient X and Y) 
Time of check  Blood Glucose ranges (mg/dL) 
 Patient X Patient Y 
Before breakfast (Fasting) < 100 70 – 130 
Before lunch, supper and 
snack 
< 110 70 – 130 
Two hours after meals < 140 < 180 
Bedtime < 120 90- 15 
 
 
 
 
 
 
 
 
 
 
 
4(a)	 Refer to Table B showing the blood report of the levels of glucose of patients X and Y. 
Infer the disease which can be diagnosed from the given data.	
1 
4(b)	 Identify the hormone whose level in the blood is responsible for the above disease. 1 
4(c)	 Which one of the following diets would you recommended to the affected patient? 
i) High sugar and low fat diet.	
ii) Low sugar and high protein diet.	
iii) High Fat and low fiber diet.	
iv) Low sugar and high fiber diet.	
1 
4(d)	 Refer to the Table A and suggest the value of the mean blood glucose level beyond which 
doctor’s advice is necessary: 
i) 180 mg/dL 
ii) 115 mg/dL 
iii) 50 mg/dL 
iv) 80 mg/dL 
 
1 
5	 When we enter a dark room coming from outside, immediately the things inside the room 
do not appear clear to our eyes. This is because 
i) pupils do not open at all in the dark. 
ii) pupils take time to adjust. 
iii) light travels slower in a dark room. 
iv) pupils open very quickly in the dark. 
OR 
The phenomena of light responsible for the working of the human eye is 
 i)   reflection 
 ii)  refraction 
 iii) power of accommodation 
 iv) persistence of vision 
1 
  1 
4	 	
	
Central	Board	of	Secondary	Education	 Central	Board	of	Secondary	Education	
		
 
6	
 
When a 4V battery is connected across an unknown resistor there is a current of 100 mA 
in the circuit. The value of the resistance of the resister is: 
i)    4 O            
ii)   40 O            
iii)  400 O          
iv)  0.4 O 
7	 Unit of electric power may also be expressed as:  
i) volt-ampere      
ii) kilowatt-hour 
iii) watt-second 
iv) joule-second 
1 
8	 It was found that water from a river was contaminated with Coliform bacteria. Which one 
of the following pollutant might have got mixed with the water?                                                                
i) Fertilizer run off 
ii) Industrial waste 
iii) Pesticides 
iv) Human faecal matter 
OR 
Which one of the following stakeholders of forests causes the maximum damage to 
forest? 
i) People who live in or around the forest 
ii) The forest department of the government 
iii) The wildlife and native enthusiasts 
iv) The industrialists  
1 
9	 Which one of the following green house gases is a contributor due to incomplete 
combustion of coal and petroleum? 
i) Oxides of nitrogen 	
ii) Methane 	
iii) Carbon monoxide 	
iv) Carbon dioxide	
1 
10	 Which of the following reactions is an endothermic reaction? 
i) Burning of coal. 
ii) Decomposition of vegetable matter into compost.  
iii) Process of respiration.  
iv) Decomposition of calcium carbonate to form quick lime and carbon dioxide. 
1 
11	 Identify the basic salt from the following salts: 
i) Na
2
CO
3
 
1 
5	 	
	
Central	Board	of	Secondary	Education	 Central	Board	of	Secondary	Education	
		
ii) NH
4
Cl 
iii) NaNO
3
 
iv) KCl 
12	 The positions of four elements A, B, C and D in the modern periodic table are shown 
below. Which element is most likely to form an acidic oxide? 
 
   
 A         
 B       
                C  
                 D 
                  
                  
 
i)    A 
ii)   B 
iii)  C 
iv)  D 
 
OR	
Elements P, Q, R and S have atomic numbers 11, 15, 17 and 18 respectively. Which of 
them are reactive non-metals? 
i) P and Q 
ii) P and R  
iii) Q and R 
iv) R and S  
  
1 
 
For question numbers 13 and 14, two statements are given- one labeled Assertion (A) and the 
other labeled Reason (R). Select the correct answer to these questions from the codes (i), (ii), 
(iii) and (iv) as given below 
i) Both A and R are true and R is correct explanation of the assertion. 
ii) Both A and R are true but R is not the correct explanation of the assertion. 
iii) A is true but R is false.  
iv) A is false but R is true. 
 
13	 Assertion: Following are the structural isomers of butane. 1