CBSE Class 8 Science Question Paper Set 03 Solved

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    SECTION ‘A’ 
 
Q.NO1 (a) The outer covering of the cell is the
 
i. nuclear membrane       ii.mitochondra      iii. Cell membrane     iv. ribosome
 
(b) A tadpole develops into an adult frog by the process of
 
i.fertilization ii.metamorphosis iii.embedding iv.budding
 
(c) In electrolytes, which of the following acts as carrier of charge?
 
i.protons      ii.electrons       iii.neutrons      iv.ions
 
(d) A body vibrating with a low frequency will
 
i.have a lower pitch      ii.have a higher pitch     iii.be louder iv.be softer
 
(e) Sound can travel in
 
i.solid       ii.liquid       iii.gas       iv.all of these
 
(f) Which of the following cannot be beaten into thin sheets?
 
i.zinc       ii.phosphorus       iii.aluminium      iv.iron
 
(g) Reproductive age in women starts when their
 
i.menstruation starts             ii.menopause starts.
 
iii.body weight increases        iv.height increases
 
(h) Power house of the cell.
 
i.nucleus ii.mitochondria iii.lysosome iv.Golgi body
 
(i) The least polluting fuel is
 
i.petrol        ii.CNG       iii.diesel         iv.coal
 
(j) Which of the following cannot be charged easily by friction?
 
i. a plastic scale       ii. a copper rod      iii.an inflated balloon      iv. a woollen cloth
 
(k) What are air pollutants?
 
(l) Why are the voices of men different from that of women?

(m) Name two diseases caused by virus.

(n) How does a vaccine work?
 
(o) Why are viruses considered to be on the border line between the living and the nonliving things?
 
(p) Name the vibrating part that produces sound in tabla. 
 
(q) In which female reproductive organ does the embryo get embedded? 
 
(r) Write the functions of the following hormones- Insulin, thyroxine.
 
(s) Give the location of adrenal glands and name the hormone secreted by it.
 
(t) I Identify the properties of metals that are used in a) making silver foil b) bells
 
 
SECTION ‘B’ 
 
Q.NOa. Why cells are the basic structural and functional unit of all living organisms?
 
b. List the functions of nerve cells.
 
(3) a.What are antibiotics?
 
b.List two precautions taken while taking antibiotics.
 
(4) a.The distance between the object and its image formed by a plane mirror appears to be 28cm.What is the distance between the mirror and the object?
 
b. State any three characteristics of the image formed.
 
(5) a. In an experiment 4.5 kg of a fuel was completely burnt. The heat produced was measured to be 180,000 kJ. Calculate the calorific value of the fuel.
 
b.It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Give reason.
 
(6) a.Why do copper vessels turn green when exposed to moist air for a long time?
 
b.Write the word equation of the above reaction.
 
c. What is the nature of metallic oxides?
 
(7) a.A simple pendulum makes 10 oscillations in 20 seconds. What is the time period?
 
b.Saurav heard sound of thunderbolt 6 second after he saw flash of lightning. How far is he from the place where lightning occurs?(Speed of sound =330m/s)
 
                                   OR
 
a.We cannot hear the sound of the exploding meteor in the sky, though we can see them.Why?
 
b. What is meant by oscillatory motion?
 
 
(8) a.What is an electroscope?
 
b.List two safety measures that should be taken during lightning and thunder.




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