CBSE Class 07 SA1 Question Paper – Science

General Instructions1. All questions are compulsory.
2. The question paper consists of four sections A, B, C and D.
(i) Section A consists of 12 questions of 1 marks each.
(ii) Section B consists of 6 questions of 2 marks each.
(iii) Section C consists of 12 questions of 3 marks each.
(iv) Section D consists of 6 questions of 5 marks each.SECTION – AQl. During respiration, the gas we breathe out is1. Carbon dioxide
2. oxygen
3. nitrogen
4. All of these

Q2. China rose indicator gives ____ colour with base

1. Orange
2. Green
3. Pink
4. yellow

Q3. The substance which turns blue litmus red is

1. Basic
2. Acidic
3. Neutral
4. All of the above

Q4. This soil is a mixture of equal amount of sand and clay, with silt &humus.

1. Sandy soil
2. Clayey soil
3. Loamy soil
4. Mixed soil

Q5. When few drops of iodine solution are added to a boiled potato, it turns

1. Green
2. Yellow
3. Blue
4. Blue black

Q6. The leaf portion that is not exposed to sunlight will not make

1. Fats
2. Proteins
3. Glucose
4. Starch

Q7. Find out which teeth you use for tearing of food

1. Canines
2. Molar
3. Premolar
4. Incisors

Q8. Why we keep healthy potted plant in a dark room

1. To produce starch in leaves
2. To produce protein in leaves
3. To destarch the leaves
4. None of these

Q9. Which one of the following is not a natural fibre?

1. Cotton
2. Rayon
3. Silk
4. Wool

Q10. The process of removing burrs from the fleece is called

1. Combing
2. Dyeing
3. Scouring
4. Spinning

Q11. When one end of metal rod is heated, the other end of rod is heated by

1. Conduction
2. Convection
3. Radiation
4. None of these

Q12. The range of the temperature in a clinical thermometer is

1. 35 to 45 degree Celsius
2. 35 to 40 degree Celsius
3. 35 to 42 degree Celsius
4. 35 to 48 degree Celsius

SECTION- B

Q13. Why do insectivorous’ plants trap insects?

Q14. What happens when a piece of iron metal is placed in CuS04 solution?

Q15. 100ml of water takes 10 minutes to percolate completely in a particular soil. Calculate the percolation rate of water in this soil.

Q16. How will you test with a turmeric indicator whether a given solution is acidic, basic or neutral?

Q17. What do you mean by the term migration? Give an example of living organisms which shows this phenomenon.

Q18. Differentiate between the process of inhalation and exhalation?

SECTION- C

Q19. Write one use of each:

(a) Sulphuric Acid
(b) Hydrochloric Acid
(c) Nitric Acid

Q20. (i) How does soil become too acidic in nature?

(ii) Name the substance which farmers should add to soil if the soil is

1. Acidic in nature
2. Basic in nature

(iii) What type of reaction takes place when an acid reacts with base? Write the reaction involved.

Q21. How do rhizobium bacteria and leguminous plants help each other in survival?

Q22. (i) In which organelles does the process of photosynthesis takes place?
(ii) Where does the energy for the process of photosynthesis come from?
(iii) Which pigment converts light energy into chemical energy?
(iv) Give three factors that affect the rate of photosynthesis.

Q23. A person has a white shirt and a black shirt. Which shirt will make him more comfortable in?

(a) Winter
(b) summer?

Give reason for your answer.

Q24. ” All the changes in the weather are caused by sun. “Do you agree with this statement? Explain your answer.

Q25. What is meant by rusting of iron? State any two conditions for the rusting of iron to occur. Give two methods of preventing the rusting of iron.

Q26. Explain various stages of the life history of silk moth.

Q27. Draw a well labelled diagram of human respiratory system.

Q28. How does a cramp occur in human body? Explain it with help of reaction.

Q29. (i) A student has two samples of soil; sample -X and sample – Y.He pours an equal amount of water in both. In X the water is standing, in Y, there is no water. What types of soil can X and Y be? Give reason.

(ii) Which type of soil has;

(a) lowest percolation rate of water

(b) highest percolation rate of water?

Q30. How does digestion process complete in ruminants? Explain with the help of diagram.

SECTION-D

Q31. Name the soil best suited for the growth of rice, wheat, lentils and cotton. Justify your answer with an account on properties of soil.

Q32. Draw labelled diagrams of regions of

(a) Tongue for different tastes
(b) Nutrition in amoeba

Q33. (i) Why shearing is done in early summers?
(ii) How shearing is helpful to sheep?
(iii) Why wool yielding animals have a thick coat of hair?
(iv) From which animal the wool is obtained for pashmina shawls. Name the region where this animal is found.

Q34. (i) When a candle burns, both physical and chemical changes takes place. Identify these changes. Give one another example in which both the chemical and physical changes take place.

(ii) How would you show that setting of curd is a chemical change?

Q35. Describe the adaptation of polar bear in the polar climatic conditions.

Q36. Justify the following;

(a) Cooking utensils are made of metals
(b) Pressure cooker is provided with Bakelite handle
(c) We wear woollen clothes in winter
(d) False ceiling keeps the room warm during winters
(e) Air conditioned buildings have double walled windows