Friday, September 29, 2017

CBSE Class 8 Science - Term 1 - Sample Question Paper (2017-18) (#cbsePapers)

SAMPLE PAPER OF SCIENCE FOR Term-1 (2017-18)       

CBSE Class 8 Science - Term 1 - Sample Question Paper (2017-18) (#cbsePapers)
M.M-90                                                                                                              Time: 3 Hrs

General Instructions:
1. The question paper consists of 34 questions and is divided into four sections, A, B, C and D
2. All questions are compulsory.
3. Section A comprises question numbers 1 to 10. Each carries 1 mark
4. Section B comprises question numbers 11 to 20. Each carries 2 marks
5. Section C comprises question numbers 21 to 30. Each carries 3 marks.
6. Section D comprises question numbers 31 to 34. Each carries 5 marks.

Q1. Name the process of sowing seeds by scattering them in the field by hand.
Q2. Why are dried neem leaves put in the container in which food grains are stored?
Q3. What is the huge reserve stock of food grains held by government agencies called?
Q4. How is yeast a beneficial fungi?
Q5. Which antibiotic was discovered first and who discovered it?
Q6. Which phenomenon  disturbs the nitrogen cycle?
Q7. Are the handles and bristles of tooth brush made of same material?
Q8. Why are metals used to make bells and musical instruments?
Q9. How does pressure at a point within a liquid change with its depth?
Q10. Why  is a sharp knife more effective in cutting a fruit than a blunt life?

Q11. How is petroleum formed?
Q12. Differentiate between kharif and rabi crops.
Q13. How are the modern methods of irrigation more efficient than traditional methods?
Q14. Mention the important uses of microorganisms in agriculture and medicine.
Q15. Plastics are replacing metals in the car industry. Give two possible reasons to support   your answer.
Q16. You are given some substances. Just by looking, can you classify those as metals and non-metals? Which physical property will you be using to classify and why?
Q17. Justify the statement: Coal is formed by carbonisation.
Q18.  Identify the action as ‘push’ or ‘pull’ in each of the instances given below.
  (i) A cricket ball hit by a batsman                      
  (ii) Planting a pin on the pin board
  (iii) Plucking the nail off the wall                      
  (iv) Picking up a shopping bag
Q19.  A body is acted upon two forces of 200N and 300N in the opposite direction. What is the resultant force acting on it?
Q20. What is meant by ultrasonic sound?  How do bats catch their prey?
Q21. (i) State any three significant points of a biosphere reserve.
(ii) Which gas cause global warming and why?
Q22. (i) Discuss the working of a sprinkler system of irrigation.
(ii) Draw a well-labelled diagram of a hoe used to remove weeds.
Q23. (i) A farmer has carried out the harvest of his crop. He now wants to store these grains for a month before selling them to an appropriate buyer. What steps should he take to store the harvest? (ii) How does lowering of temperature help in increasing the shelf-life of food?
Q24. (i) Explain any three methods of food preservation.
(ii) Name any three common preservatives.
Q25. What is meant by biodegradable and non-biodegradable materials? Give examples of  two biodegradable and two non-biodegradable materials.
Q26. Why is natural gas considered as an ideal fuel? Give 3 points.
Q27.  Give reason:-
  (i)  Ordinary car tyres  have grooves but the tyres of racing car are smooth.
(ii) Mountaineers  often suffer from nose bleeding when they go to higher altitudes?
Q28. (i) Explain how the use of oil reduces friction between two surfaces in contact with each other. (ii) Name two common lubricants.
Q29.  Define:
(a) Amplitude (b) Time period (c) Frequency
Q30. Suggest three points to save petrol.

Q 31. What is meant by sowing? Mention the advantages of sowing with a seed drill.
Q32. (i) Why does curd sets faster in summer than in winter ?
(ii) Explain two ways of nitrogen fixation .
Q33. (i) Silver is best conductor. Why it is not used for making electric wires?
(ii) How can we minimise the use of plastics? Write three points.
(iii) Why is carbon monoxide considered a poisonous gas ?
Q34. (i) What happens when we rub a plastic object such as a pen or a comb with hair? Which type of force is operating in this case?
(ii) Why are skis used to glide over snow?
(iii) Why do tractors have broad tyres?

Q 1 Which group of animals does not give us a food product?
   A. Honeybee and goat                              
   B. Cow and buffalo
   C. Silk moth and oyster                                
   D. Fish and sheep

Q 2 Identify the correct sequence of events carried out in preparation of soil.
A. Ploughing →Levelling of soil → Watering of dry soil → Breaking the crumbs
B. Watering of dry soil → Breaking the crumbs → Ploughing → Levelling of soil
C. Breaking the crumbs → Ploughing → Levelling of soil → Watering of dry soil
D. Watering of dry soil →Ploughing → Breaking the crumbs →Levelling of soil

Q 3 Which of the following is false about antibiotics?        
A. Antibiotics should be taken only on the advice of a qualified doctor.
  B. Taking antibiotics when not needed or in wrong doses may make the drug less effective when you may need it in the future.
C. Antibiotics taken unnecessarily may kill the beneficial bacteria in the body.
  D. Antibiotics are highly effective for curing diseases caused by viruses.

Q 4 Citrus canker and measles are both
  A. Water-borne diseases                          
  B. Insect-borne diseases
  C. Air-borne diseases                                
  D. Seed-borne diseases

Q5 Which of the following is an endangered species of animals?
A. Dinosaur      
B. Asiatic lion      
C. Irish deer            
D. Hyena

Q6  Rayon is chemically made by the treatment of
A. Protein    
B. Cellulose      
C. Fats              
D. Amylase

Q7  A comb is an example of
A. Thermosetting plastic    
B. Thermoplastic      
C. Natural polymer        
D. All of the above

Q8 Which of the following metals can be easily cut with a knife?
  A. Aluminium      
  B. Sodium        
  C. Copper      
  D. Iron

Q9  A purple colour liquid of a non-metal is applied on wounds as an antiseptic. The non-metal is
A. Chlorine          
B. Bromine      
C. Iodine        
D. Carbon

Q10. 2Mg + O2  ----> 2MgO. Which type of oxide is magnesium oxide?
A. Basic              
B. Acidic          
C. Neutral        
D. Mixture of all

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