Download q13) which metals are used for making fine electrical contacts in

SUMMER VACATION HOME ASSIGNMENT
CLASS (VIII) - SCIENCE
Q1) WRITE 10 USES OF MICROORGANISMS IN OUR LIFE.
Q2)WHAT IS NITROGEN FIXATION? NAME 1 NITROGEN FIXING
BACTERIA.
DRAW A SCHEMATIC DIAGRAM OF NITROGEN CYCLE.
Q3) EXPLAIN WHY PASTEURISED MILK CAN BE CONSUMED WITHOUT
BOILING.
Q4) HOW CAN THE SPOILAGE IN FOOD BE DETECTED?
Q5) EXPLAIN VARIOUS METHODS OF FOOD PRESERVATION.
Q6) WHY TEFLON IS USED IN MAKING COOKWARES?
Q7) WHY ARE PLASTICS ARE CONSIDSERED A THREAT TO OUR
ENVIRONMENT.
Q8) DIFFERENTIATE THERMOPLASTICS AND THERMO SETTING
PLASTICS.
Q9) WRITE 2 IMPORTANT PROPERTIES OF BAKELITE.
Q10) WHY ARTIFICIAL WOOL HAS BECOME MORE POPULAR THAN
NATURAL WOOL?
Q11) WRITE PROPERTIES OF METALS AND EXPLAIN.
Q12) WHY IS TINCTURE IS APPLIED ON WOUNDS?
Q13) WHICH METALS ARE USED FOR MAKING FINE ELECTRICAL
CONTACTS IN COMPUTERS AND SOLAR CELLS?
Q14) EXPLAIN THE USE OF CHLORINE IN WATER PURIFICATION?
Q15) GIVE REASONS:
i)
ii)
iii)
Silver is used in making mirrors.
Food stuffs with acid components should not be stored in
aluminum containers.
Iron is used in construction of bridges.
ACTIVITIES: Find out deposits’ of iron, aluminum, and zinc in India.
Mark these in outline map of India.
2. Debate: My fabric is superior (synthetic fiber vs. natural fibres ).
3. Collect pictures of various microorganisms and write 2
characteristics of each. (10pictures) paste them in your activity file.