Science - Multiple Choice Questions (With Solutions), Class 7 Notes - Class 7

 Page 1


 
1  
Class: VII   Science 
Full Marks: 90          Time: 2.00 hrs 
1. Name the gas which is used by white blood cells to kill the invading bacteria. 
 
(a) Oxygen  (b) Carbon dioxide  (c) Nitrogen  (d) Chlorine 
 
2. What is the percentage of oxygen in the inhaled air?  
 
(a) 21%  (b) 16.4%  (c) 18%  (d) 20% 
 
3. What is the percentage of CO
2
   in the exhaled air?  
 
(a) 23%  (b) 4.4%  (c) 6%  (d) 0.04% 
 
4. Normal range of breathing rate per minute in an adult person at rest is  
 
(a) 9 - 12, (b) 15 - 18, (c) 21 - 24, (d) 30 - 33 
 
5. Muscle cramps occurs due to accumulation of  
 
(a) Lactic acid  (b) Acetic acid  (c) Alcohol  (d) Malice acid 
 
6. During exhalation the ribs 
 
(a) move down and inwards (b) move upwards (c) move outwards (d) do not move at all 
 
7. In cockroach, air enters the body through  
 
(a) Lungs  (b) Gills  (c) Spiracles  (d) Skin 
 
8. The air tubes in insects are called 
 
(a) Bronchus  (b) Tracheae  (c) Nostrils  (d) blowholes  
 
9. Name the muscular sheet which separates the abdomen from the chest cavity. 
 
(a) Diaphram (b) Ribs (c) Spiracles (d) Tracheae 
 
10. Birds breathe through 
 
(a) Lungs  (b) Kidney  (c) Spiracles  (d) Skin 
 
11. Which of the following organism can do anaerobic respiration? 
 
(a) Yeast  (b) Leech  (c) Amoeba,  (d) Fish 
 
12. The food material used to release energy in body cells, which is considered as a biological fuel is 
 
(a) Glucose  (b) Vitamin  (c) Water  (d) Minerals 
 
13. Snake breathe through 
 
(a) Lungs  (b) Spiracles  (c) Tracheae  (d) Skin 
                   
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Page 2


 
1  
Class: VII   Science 
Full Marks: 90          Time: 2.00 hrs 
1. Name the gas which is used by white blood cells to kill the invading bacteria. 
 
(a) Oxygen  (b) Carbon dioxide  (c) Nitrogen  (d) Chlorine 
 
2. What is the percentage of oxygen in the inhaled air?  
 
(a) 21%  (b) 16.4%  (c) 18%  (d) 20% 
 
3. What is the percentage of CO
2
   in the exhaled air?  
 
(a) 23%  (b) 4.4%  (c) 6%  (d) 0.04% 
 
4. Normal range of breathing rate per minute in an adult person at rest is  
 
(a) 9 - 12, (b) 15 - 18, (c) 21 - 24, (d) 30 - 33 
 
5. Muscle cramps occurs due to accumulation of  
 
(a) Lactic acid  (b) Acetic acid  (c) Alcohol  (d) Malice acid 
 
6. During exhalation the ribs 
 
(a) move down and inwards (b) move upwards (c) move outwards (d) do not move at all 
 
7. In cockroach, air enters the body through  
 
(a) Lungs  (b) Gills  (c) Spiracles  (d) Skin 
 
8. The air tubes in insects are called 
 
(a) Bronchus  (b) Tracheae  (c) Nostrils  (d) blowholes  
 
9. Name the muscular sheet which separates the abdomen from the chest cavity. 
 
(a) Diaphram (b) Ribs (c) Spiracles (d) Tracheae 
 
10. Birds breathe through 
 
(a) Lungs  (b) Kidney  (c) Spiracles  (d) Skin 
 
11. Which of the following organism can do anaerobic respiration? 
 
(a) Yeast  (b) Leech  (c) Amoeba,  (d) Fish 
 
12. The food material used to release energy in body cells, which is considered as a biological fuel is 
 
(a) Glucose  (b) Vitamin  (c) Water  (d) Minerals 
 
13. Snake breathe through 
 
(a) Lungs  (b) Spiracles  (c) Tracheae  (d) Skin 
                   
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2  
14. During anaerobic respiration the end product other than CO
2
and energy is 
 
(a) O
2
    (b) Alcohol  (c) Nitrogen  (d) Water 
             
15. Name the chemical used to test the presence of CO
2
   in exhaled air. 
                                                                                                                                    
(a) Lime juice  (b) Lime water  (c) Lime stone  (d) Quick lime 
 
16. Name the tiny pores present in the leaves of the plants for exchange of gases 
 
(a) Stomata  (b) Tracheae  (c) Chloroplast  (d) Spiracles 
 
17. Yeast respire an aerobically to produce 
 
(a) Water  (b) Alcohol  (c) Glucose  (d) Lactic acid  
 
18. The number of times a person breathe in a ______________ is termed as breathing rate 
 
(a) Second  (b) Minute  (c) Hour  (d) Day 
 
19.  Chest cavity is surrounded by 
 
(a) 12 pair of ribs  (b) 10 pair of ribs  (c) 11 pair of ribs  (d) 25 ribs. 
 
20. Wind pipe is called  
 
(a) Oesophagus  (b) Tracheae  (c) Bronchus  (d) Nasal Cavity 
21. Our _______ cells can respire anaerobically. 
    (a) nerve          (b) muscle          (c) germ          (d) blood.    
22. Respiration releases energy from the __________.  
    (a) air         (b) water         (c)food         (d) sunlight. 
23. Glucose breaks down into ___________. 
    (a) ascorbic acid   (b)citric acid   (c) lactic acid    
    (d)  hydrochloric acid. 
24. The accumulation of ______ acid causes muscle cramps. 
     (a) hydrochloric acid (b) lactic acid (c)ascorbic acid                    
     (d) citric acid. 
25. The process of breakdown of food in the cell is called     
     __________.  
    (a) aerobic respiration  (b) anaerobic respiration    
     (c)   pulmonary respiration (d) cellular respiration.  
26. Breathing rate is defined as number of times a person  
    breathes in a ___________. 
   (a) second       (b) minute       (c) hour       (d) day.  
 
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Page 3


 
1  
Class: VII   Science 
Full Marks: 90          Time: 2.00 hrs 
1. Name the gas which is used by white blood cells to kill the invading bacteria. 
 
(a) Oxygen  (b) Carbon dioxide  (c) Nitrogen  (d) Chlorine 
 
2. What is the percentage of oxygen in the inhaled air?  
 
(a) 21%  (b) 16.4%  (c) 18%  (d) 20% 
 
3. What is the percentage of CO
2
   in the exhaled air?  
 
(a) 23%  (b) 4.4%  (c) 6%  (d) 0.04% 
 
4. Normal range of breathing rate per minute in an adult person at rest is  
 
(a) 9 - 12, (b) 15 - 18, (c) 21 - 24, (d) 30 - 33 
 
5. Muscle cramps occurs due to accumulation of  
 
(a) Lactic acid  (b) Acetic acid  (c) Alcohol  (d) Malice acid 
 
6. During exhalation the ribs 
 
(a) move down and inwards (b) move upwards (c) move outwards (d) do not move at all 
 
7. In cockroach, air enters the body through  
 
(a) Lungs  (b) Gills  (c) Spiracles  (d) Skin 
 
8. The air tubes in insects are called 
 
(a) Bronchus  (b) Tracheae  (c) Nostrils  (d) blowholes  
 
9. Name the muscular sheet which separates the abdomen from the chest cavity. 
 
(a) Diaphram (b) Ribs (c) Spiracles (d) Tracheae 
 
10. Birds breathe through 
 
(a) Lungs  (b) Kidney  (c) Spiracles  (d) Skin 
 
11. Which of the following organism can do anaerobic respiration? 
 
(a) Yeast  (b) Leech  (c) Amoeba,  (d) Fish 
 
12. The food material used to release energy in body cells, which is considered as a biological fuel is 
 
(a) Glucose  (b) Vitamin  (c) Water  (d) Minerals 
 
13. Snake breathe through 
 
(a) Lungs  (b) Spiracles  (c) Tracheae  (d) Skin 
                   
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2  
14. During anaerobic respiration the end product other than CO
2
and energy is 
 
(a) O
2
    (b) Alcohol  (c) Nitrogen  (d) Water 
             
15. Name the chemical used to test the presence of CO
2
   in exhaled air. 
                                                                                                                                    
(a) Lime juice  (b) Lime water  (c) Lime stone  (d) Quick lime 
 
16. Name the tiny pores present in the leaves of the plants for exchange of gases 
 
(a) Stomata  (b) Tracheae  (c) Chloroplast  (d) Spiracles 
 
17. Yeast respire an aerobically to produce 
 
(a) Water  (b) Alcohol  (c) Glucose  (d) Lactic acid  
 
18. The number of times a person breathe in a ______________ is termed as breathing rate 
 
(a) Second  (b) Minute  (c) Hour  (d) Day 
 
19.  Chest cavity is surrounded by 
 
(a) 12 pair of ribs  (b) 10 pair of ribs  (c) 11 pair of ribs  (d) 25 ribs. 
 
20. Wind pipe is called  
 
(a) Oesophagus  (b) Tracheae  (c) Bronchus  (d) Nasal Cavity 
21. Our _______ cells can respire anaerobically. 
    (a) nerve          (b) muscle          (c) germ          (d) blood.    
22. Respiration releases energy from the __________.  
    (a) air         (b) water         (c)food         (d) sunlight. 
23. Glucose breaks down into ___________. 
    (a) ascorbic acid   (b)citric acid   (c) lactic acid    
    (d)  hydrochloric acid. 
24. The accumulation of ______ acid causes muscle cramps. 
     (a) hydrochloric acid (b) lactic acid (c)ascorbic acid                    
     (d) citric acid. 
25. The process of breakdown of food in the cell is called     
     __________.  
    (a) aerobic respiration  (b) anaerobic respiration    
     (c)   pulmonary respiration (d) cellular respiration.  
26. Breathing rate is defined as number of times a person  
    breathes in a ___________. 
   (a) second       (b) minute       (c) hour       (d) day.  
 
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3  
27. When we inhale air, it passes through our nostrils into  the ___________. 
    (a) chest cavity (b)diaphragm (c) nasal cavity (d) cardial cavity 
 28. A large muscular sheet which forms the floor of the chest cavity is called 
(a)  lungs     (b)  liver      (c)  stomach     (d)  diaphragm    
29.  Smoking damages  
 (a) heart      (b) liver      (c)  lungs      (d)  spleen                                                        
30. A cockroach has small openings on the sides of its body called  
(a)  trachea      (b)  spiracles    (c)  setae      (d)  none 
31.  Though frogs have a pair of lungs they can also breathe  through their  
(a)  nose      (b)  heart      (c)  liver      (d)  skin 
32.  Gills help fishes to dissolve ___________  in water 
(a)  oxygen    (b)  carbondioxide  (c)  hydrogen  (d)  all 
33.  Gills are well supplied with___________for gaseous exchange  
(a)  oxygen   (b)  carbondioxide  (c)  hydrogen   
(d)  blood vessels 
34.  The root cells also need__________to generate energy 
(a)  water    (b) sunlight   (c)  oxygen    (d) chlorophyll 
35.  In insects, the exchange of gases takes place through  
(a)   spiracles  (b)  antennae  (c)  trachea   (d)  skin 
36.  During inhalation, our lungs__________ 
(a)  contracts  (b)  exchanges gases  (c)  expands 
(d)  releases energy 
37.  Respiration in plants takes place through  
(a)  root hair  (b)  chlorophyll  (c)  stomata  (d)  buds 
38.  Earthworms breathe through their 
(a)  trachea   (b)  spiracles   (c)  setae     (d)   skin 
39.  Lizard and snakes have__________for breathing 
(a)  heart   (b)  lungs   (c)  skin   (d)  trachea 
40.  The percentage of carbondioxide exhaled is  
(a)  21 %    (b)  0.04 %    (c)  16.4 %   (d)  4.4 % 
41. Human lungs are covered by two thin membranes called 
(a)  pleura   (b)  diaphragm   (c)  thoracic membrane 
(d)  cartilaginous membrane 
42.  In the process of inhalation and exhalation about________of air  
       is breathed in and out 
(a)  300 ml   (b)  500 ml   (c)  800 ml   (d)  700 ml 
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Page 4


 
1  
Class: VII   Science 
Full Marks: 90          Time: 2.00 hrs 
1. Name the gas which is used by white blood cells to kill the invading bacteria. 
 
(a) Oxygen  (b) Carbon dioxide  (c) Nitrogen  (d) Chlorine 
 
2. What is the percentage of oxygen in the inhaled air?  
 
(a) 21%  (b) 16.4%  (c) 18%  (d) 20% 
 
3. What is the percentage of CO
2
   in the exhaled air?  
 
(a) 23%  (b) 4.4%  (c) 6%  (d) 0.04% 
 
4. Normal range of breathing rate per minute in an adult person at rest is  
 
(a) 9 - 12, (b) 15 - 18, (c) 21 - 24, (d) 30 - 33 
 
5. Muscle cramps occurs due to accumulation of  
 
(a) Lactic acid  (b) Acetic acid  (c) Alcohol  (d) Malice acid 
 
6. During exhalation the ribs 
 
(a) move down and inwards (b) move upwards (c) move outwards (d) do not move at all 
 
7. In cockroach, air enters the body through  
 
(a) Lungs  (b) Gills  (c) Spiracles  (d) Skin 
 
8. The air tubes in insects are called 
 
(a) Bronchus  (b) Tracheae  (c) Nostrils  (d) blowholes  
 
9. Name the muscular sheet which separates the abdomen from the chest cavity. 
 
(a) Diaphram (b) Ribs (c) Spiracles (d) Tracheae 
 
10. Birds breathe through 
 
(a) Lungs  (b) Kidney  (c) Spiracles  (d) Skin 
 
11. Which of the following organism can do anaerobic respiration? 
 
(a) Yeast  (b) Leech  (c) Amoeba,  (d) Fish 
 
12. The food material used to release energy in body cells, which is considered as a biological fuel is 
 
(a) Glucose  (b) Vitamin  (c) Water  (d) Minerals 
 
13. Snake breathe through 
 
(a) Lungs  (b) Spiracles  (c) Tracheae  (d) Skin 
                   
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2  
14. During anaerobic respiration the end product other than CO
2
and energy is 
 
(a) O
2
    (b) Alcohol  (c) Nitrogen  (d) Water 
             
15. Name the chemical used to test the presence of CO
2
   in exhaled air. 
                                                                                                                                    
(a) Lime juice  (b) Lime water  (c) Lime stone  (d) Quick lime 
 
16. Name the tiny pores present in the leaves of the plants for exchange of gases 
 
(a) Stomata  (b) Tracheae  (c) Chloroplast  (d) Spiracles 
 
17. Yeast respire an aerobically to produce 
 
(a) Water  (b) Alcohol  (c) Glucose  (d) Lactic acid  
 
18. The number of times a person breathe in a ______________ is termed as breathing rate 
 
(a) Second  (b) Minute  (c) Hour  (d) Day 
 
19.  Chest cavity is surrounded by 
 
(a) 12 pair of ribs  (b) 10 pair of ribs  (c) 11 pair of ribs  (d) 25 ribs. 
 
20. Wind pipe is called  
 
(a) Oesophagus  (b) Tracheae  (c) Bronchus  (d) Nasal Cavity 
21. Our _______ cells can respire anaerobically. 
    (a) nerve          (b) muscle          (c) germ          (d) blood.    
22. Respiration releases energy from the __________.  
    (a) air         (b) water         (c)food         (d) sunlight. 
23. Glucose breaks down into ___________. 
    (a) ascorbic acid   (b)citric acid   (c) lactic acid    
    (d)  hydrochloric acid. 
24. The accumulation of ______ acid causes muscle cramps. 
     (a) hydrochloric acid (b) lactic acid (c)ascorbic acid                    
     (d) citric acid. 
25. The process of breakdown of food in the cell is called     
     __________.  
    (a) aerobic respiration  (b) anaerobic respiration    
     (c)   pulmonary respiration (d) cellular respiration.  
26. Breathing rate is defined as number of times a person  
    breathes in a ___________. 
   (a) second       (b) minute       (c) hour       (d) day.  
 
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3  
27. When we inhale air, it passes through our nostrils into  the ___________. 
    (a) chest cavity (b)diaphragm (c) nasal cavity (d) cardial cavity 
 28. A large muscular sheet which forms the floor of the chest cavity is called 
(a)  lungs     (b)  liver      (c)  stomach     (d)  diaphragm    
29.  Smoking damages  
 (a) heart      (b) liver      (c)  lungs      (d)  spleen                                                        
30. A cockroach has small openings on the sides of its body called  
(a)  trachea      (b)  spiracles    (c)  setae      (d)  none 
31.  Though frogs have a pair of lungs they can also breathe  through their  
(a)  nose      (b)  heart      (c)  liver      (d)  skin 
32.  Gills help fishes to dissolve ___________  in water 
(a)  oxygen    (b)  carbondioxide  (c)  hydrogen  (d)  all 
33.  Gills are well supplied with___________for gaseous exchange  
(a)  oxygen   (b)  carbondioxide  (c)  hydrogen   
(d)  blood vessels 
34.  The root cells also need__________to generate energy 
(a)  water    (b) sunlight   (c)  oxygen    (d) chlorophyll 
35.  In insects, the exchange of gases takes place through  
(a)   spiracles  (b)  antennae  (c)  trachea   (d)  skin 
36.  During inhalation, our lungs__________ 
(a)  contracts  (b)  exchanges gases  (c)  expands 
(d)  releases energy 
37.  Respiration in plants takes place through  
(a)  root hair  (b)  chlorophyll  (c)  stomata  (d)  buds 
38.  Earthworms breathe through their 
(a)  trachea   (b)  spiracles   (c)  setae     (d)   skin 
39.  Lizard and snakes have__________for breathing 
(a)  heart   (b)  lungs   (c)  skin   (d)  trachea 
40.  The percentage of carbondioxide exhaled is  
(a)  21 %    (b)  0.04 %    (c)  16.4 %   (d)  4.4 % 
41. Human lungs are covered by two thin membranes called 
(a)  pleura   (b)  diaphragm   (c)  thoracic membrane 
(d)  cartilaginous membrane 
42.  In the process of inhalation and exhalation about________of air  
       is breathed in and out 
(a)  300 ml   (b)  500 ml   (c)  800 ml   (d)  700 ml 
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4  
43.  The total area for gas exchange provided by our 300 million alveoli in two lungs is  
(a) 63 to 27meters  (b)  36 to 72 meters  (c)  42 to 74 meters 
(d) 27 to 47 meters 
44. Mussels respire through their 
(a)  skin     (b)  gills    (c)   lungs    (d)   trachea 
 
45 The voice box is called  
(a)   epiglottis    (b)  glottis   (c)  larynx    (d)   vocal cords  
 
46. Radiation 
(a) does not require any medium 
(b) is the process of transfer of heat in liquids 
(c) is the process of transfer of heat in which heat traveles in one direction. 
(d) Occurs in solids. 
 
47. A Thermos flask prevents loss or gain of heat by 
a. conductions only 
b. convections only 
c. radiation only 
d. all the above 
 
48. Handles of cooking utensils should be made of material that 
a. conducts heat well 
b. does not conduct heat 
c. radiate heat well 
d. does not radiate heat 
 
49. Sea breeze and land breeze 
a. are caused by currents set up in air due to conduction 
b. are caused by currents set up in air due to convection 
c. are caused by currents set up in air due to radiation 
d. have no relation to conduction, convection and radiation 
 
50. Which of the following is the best heat insulator 
a. air 
b. steel 
c. copper 
d. iron 
      
51. Heat from the sun reaches us by the process of  
a. conduction 
b. convection 
c. radiation 
d. all the above 
 
52. In liquids heat is transferred  
a. only by convection 
b. only by radiation 
c. mainly by conduction and convection 
d. none of these 
 
 
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Page 5


 
1  
Class: VII   Science 
Full Marks: 90          Time: 2.00 hrs 
1. Name the gas which is used by white blood cells to kill the invading bacteria. 
 
(a) Oxygen  (b) Carbon dioxide  (c) Nitrogen  (d) Chlorine 
 
2. What is the percentage of oxygen in the inhaled air?  
 
(a) 21%  (b) 16.4%  (c) 18%  (d) 20% 
 
3. What is the percentage of CO
2
   in the exhaled air?  
 
(a) 23%  (b) 4.4%  (c) 6%  (d) 0.04% 
 
4. Normal range of breathing rate per minute in an adult person at rest is  
 
(a) 9 - 12, (b) 15 - 18, (c) 21 - 24, (d) 30 - 33 
 
5. Muscle cramps occurs due to accumulation of  
 
(a) Lactic acid  (b) Acetic acid  (c) Alcohol  (d) Malice acid 
 
6. During exhalation the ribs 
 
(a) move down and inwards (b) move upwards (c) move outwards (d) do not move at all 
 
7. In cockroach, air enters the body through  
 
(a) Lungs  (b) Gills  (c) Spiracles  (d) Skin 
 
8. The air tubes in insects are called 
 
(a) Bronchus  (b) Tracheae  (c) Nostrils  (d) blowholes  
 
9. Name the muscular sheet which separates the abdomen from the chest cavity. 
 
(a) Diaphram (b) Ribs (c) Spiracles (d) Tracheae 
 
10. Birds breathe through 
 
(a) Lungs  (b) Kidney  (c) Spiracles  (d) Skin 
 
11. Which of the following organism can do anaerobic respiration? 
 
(a) Yeast  (b) Leech  (c) Amoeba,  (d) Fish 
 
12. The food material used to release energy in body cells, which is considered as a biological fuel is 
 
(a) Glucose  (b) Vitamin  (c) Water  (d) Minerals 
 
13. Snake breathe through 
 
(a) Lungs  (b) Spiracles  (c) Tracheae  (d) Skin 
                   
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2  
14. During anaerobic respiration the end product other than CO
2
and energy is 
 
(a) O
2
    (b) Alcohol  (c) Nitrogen  (d) Water 
             
15. Name the chemical used to test the presence of CO
2
   in exhaled air. 
                                                                                                                                    
(a) Lime juice  (b) Lime water  (c) Lime stone  (d) Quick lime 
 
16. Name the tiny pores present in the leaves of the plants for exchange of gases 
 
(a) Stomata  (b) Tracheae  (c) Chloroplast  (d) Spiracles 
 
17. Yeast respire an aerobically to produce 
 
(a) Water  (b) Alcohol  (c) Glucose  (d) Lactic acid  
 
18. The number of times a person breathe in a ______________ is termed as breathing rate 
 
(a) Second  (b) Minute  (c) Hour  (d) Day 
 
19.  Chest cavity is surrounded by 
 
(a) 12 pair of ribs  (b) 10 pair of ribs  (c) 11 pair of ribs  (d) 25 ribs. 
 
20. Wind pipe is called  
 
(a) Oesophagus  (b) Tracheae  (c) Bronchus  (d) Nasal Cavity 
21. Our _______ cells can respire anaerobically. 
    (a) nerve          (b) muscle          (c) germ          (d) blood.    
22. Respiration releases energy from the __________.  
    (a) air         (b) water         (c)food         (d) sunlight. 
23. Glucose breaks down into ___________. 
    (a) ascorbic acid   (b)citric acid   (c) lactic acid    
    (d)  hydrochloric acid. 
24. The accumulation of ______ acid causes muscle cramps. 
     (a) hydrochloric acid (b) lactic acid (c)ascorbic acid                    
     (d) citric acid. 
25. The process of breakdown of food in the cell is called     
     __________.  
    (a) aerobic respiration  (b) anaerobic respiration    
     (c)   pulmonary respiration (d) cellular respiration.  
26. Breathing rate is defined as number of times a person  
    breathes in a ___________. 
   (a) second       (b) minute       (c) hour       (d) day.  
 
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3  
27. When we inhale air, it passes through our nostrils into  the ___________. 
    (a) chest cavity (b)diaphragm (c) nasal cavity (d) cardial cavity 
 28. A large muscular sheet which forms the floor of the chest cavity is called 
(a)  lungs     (b)  liver      (c)  stomach     (d)  diaphragm    
29.  Smoking damages  
 (a) heart      (b) liver      (c)  lungs      (d)  spleen                                                        
30. A cockroach has small openings on the sides of its body called  
(a)  trachea      (b)  spiracles    (c)  setae      (d)  none 
31.  Though frogs have a pair of lungs they can also breathe  through their  
(a)  nose      (b)  heart      (c)  liver      (d)  skin 
32.  Gills help fishes to dissolve ___________  in water 
(a)  oxygen    (b)  carbondioxide  (c)  hydrogen  (d)  all 
33.  Gills are well supplied with___________for gaseous exchange  
(a)  oxygen   (b)  carbondioxide  (c)  hydrogen   
(d)  blood vessels 
34.  The root cells also need__________to generate energy 
(a)  water    (b) sunlight   (c)  oxygen    (d) chlorophyll 
35.  In insects, the exchange of gases takes place through  
(a)   spiracles  (b)  antennae  (c)  trachea   (d)  skin 
36.  During inhalation, our lungs__________ 
(a)  contracts  (b)  exchanges gases  (c)  expands 
(d)  releases energy 
37.  Respiration in plants takes place through  
(a)  root hair  (b)  chlorophyll  (c)  stomata  (d)  buds 
38.  Earthworms breathe through their 
(a)  trachea   (b)  spiracles   (c)  setae     (d)   skin 
39.  Lizard and snakes have__________for breathing 
(a)  heart   (b)  lungs   (c)  skin   (d)  trachea 
40.  The percentage of carbondioxide exhaled is  
(a)  21 %    (b)  0.04 %    (c)  16.4 %   (d)  4.4 % 
41. Human lungs are covered by two thin membranes called 
(a)  pleura   (b)  diaphragm   (c)  thoracic membrane 
(d)  cartilaginous membrane 
42.  In the process of inhalation and exhalation about________of air  
       is breathed in and out 
(a)  300 ml   (b)  500 ml   (c)  800 ml   (d)  700 ml 
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4  
43.  The total area for gas exchange provided by our 300 million alveoli in two lungs is  
(a) 63 to 27meters  (b)  36 to 72 meters  (c)  42 to 74 meters 
(d) 27 to 47 meters 
44. Mussels respire through their 
(a)  skin     (b)  gills    (c)   lungs    (d)   trachea 
 
45 The voice box is called  
(a)   epiglottis    (b)  glottis   (c)  larynx    (d)   vocal cords  
 
46. Radiation 
(a) does not require any medium 
(b) is the process of transfer of heat in liquids 
(c) is the process of transfer of heat in which heat traveles in one direction. 
(d) Occurs in solids. 
 
47. A Thermos flask prevents loss or gain of heat by 
a. conductions only 
b. convections only 
c. radiation only 
d. all the above 
 
48. Handles of cooking utensils should be made of material that 
a. conducts heat well 
b. does not conduct heat 
c. radiate heat well 
d. does not radiate heat 
 
49. Sea breeze and land breeze 
a. are caused by currents set up in air due to conduction 
b. are caused by currents set up in air due to convection 
c. are caused by currents set up in air due to radiation 
d. have no relation to conduction, convection and radiation 
 
50. Which of the following is the best heat insulator 
a. air 
b. steel 
c. copper 
d. iron 
      
51. Heat from the sun reaches us by the process of  
a. conduction 
b. convection 
c. radiation 
d. all the above 
 
52. In liquids heat is transferred  
a. only by convection 
b. only by radiation 
c. mainly by conduction and convection 
d. none of these 
 
 
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5  
53. Stainless steel pans are provided with copper bottom because  
a. copper is easier to clean than stainless steel 
b. such pans are colourful  
c. copper bottom makes the pan more durable 
d. copper is better conductor of heat than stainless steel 
     
54. A polished silvery surface is 
a. good absorber of heat 
b. good reflector of heat 
c. poor reflector of heat 
d. None of these 
 
55. Land breeze blows in coastal regions during 
a. day 
b. summer 
c. winter 
d. night 
 
56. A wooden spoon is dipped in a cup of icecream.  Its other end  
a. does not become cold 
b. becomes cold by the process of radiation 
c. becomes cold by the process of convection 
d. becomes cold by the process of conduction 
 
57. Dark coloured clothes are preferred during 
a. summer  (b) sand storm 
       (c)  winter (d) none of these 
 
58. A black body with rough surface is a  
a. good reflector and poor absorber of heat 
b. good absorber and good radiator of heat 
c. good absorber and poor radiator of heat 
d. good reflector and poor radiator of heat 
 
59. Range of laboratory thermometer is generally from  
a. -10
0
 F  to  110
0
 F 
b.  10
0
 C  to  110
0
 C 
c.  10
0
 C  to  -110
0
 C 
d. -10
0
 C  to  110
0
 C 
: 2 : 
60. Normal temperature of human body is 
(a) 37
o 
F (b) 37
0 
C (c)   39
0 
C (d)   39
0 
F 
 
61. Which of the following is a good conductor of heat 
(a) Wool  (b) Water  (c)  Wood  (d) Silver 
 
62. Device used for measuring temperature 
(a) Barometer (b) Odometer (c) Thermometer (d) Speedometer 
 
63. Transmission of heat energy with actual movement of particles 
(a) Conduction (b) Convection (c) Radiation (d) None of these. 
 
 
 
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