Q No. B-Fill in the blanks:
1) Curd contains bacterium........
2) Diseases causing microorganisms are called..........
3) All .......... are good conductor of heat and electricity.
4) Though a metal, mercury is .........at room temperature.
5) Friction applied by fluids is called a..........
6)...reduces friction between the rubbing surface.
Q No.C-State true or false:
1) Malaria is caused by plasmodium.
2) Penicillin was discovered by Alexander Flemming.
3) Carbon can be drawn into wires.
4) Sodium is a very reactive metal
5) Friction always oppose motion.
6) Friction of air makes the meteors burn.
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Curd may contain a wide variety of bacteria like Lactobacillus acidophilus, Lactococcus lactis, Lactococcus lactis cremoris etc, whereas yoghurt contains Streptococcus thermophillus and Lactobacillus bulgaricus. (2) A variety of microorganisms can cause disease. Pathogenic organisms are of five main types: viruses, bacteria, fungi, protozoa, and worms. Some common pathogens in each group are listed in the column on the right. (3)Obviously, string is an insulator, and copper is a conductor. As a general rule, substances which are good conductors of heat are also good conductors of electricity. Thus, all metals are conductors, whereas air, (pure) water, plastics, glasses, and ceramics are insulators.
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Qn B. fill in the blanks
1) Lactobacillus
2)pathogens
3)metal
4) liquid
5)fluid friction
6) Smoothness
Qn c. true/false
1)True because malaria is caused by plasmodium parasite.
2)True Penicillin was discovered by Alexander Flemming in 1928.
3)false. carbon is brittle,if you will try to draw it into wire it will brittle.
4)True. Sodium is highly reactive metal
5)True.
6)True. they burns due to friction in mesosphere.
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