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Worksheetsclass 8 - revision 1
Total questions: 32
Worksheet time: 16mins
An example of rabi crop is
groundnut
wheat
jowar
soya bean
the first step in the soil preparation is
leveling
ploughing
both of these
none of these
leguminous plants are grown to
enrich hydrogen in the soil
fix nitrogen into useable form in the soil
fix oxygen in the soil
all of these
the advantage of using manures in the fields
improves soil texture.
enhances the capacity of soil to hold water.
makes soil porous
all of these
sprinkler system is useful on
clayey soil
even land
alluvial soil
sandy soil
the disease causing microorganism are called
bacteria
fungi
virus
pathogens
name the microorganism the is involved in the curdling of milk
streptococcus
salmonella typhi
lactobacillus
none of these
the mode of transfer of cholera is
water
air
mosquito bite
none of these
chicken pox is spread through
water
food
mosquito bite
direct contact
causing agent of citrus canker disease in citrus plants is
fungi
bacterium
virus
protozoans
the best method for storing milk and milk products is
drying
pasteurization
deep freezing
canning
the substances used to produce immunity to diseases in the living body
antibiotic
antiseptic
vaccine
none of these
which of the following is an antibiotic
penicillin
vaccine
alcohol
toxin
ropes are made of nylon fibres because they
are highly elastic
are hydrophobic
have high tensile strength
all are correct
melamine is used for making
kitchenware
fire-resistant fabrics
floor tiles
all of them
natural polymer among the following is
haemoglobin
melamine
acrilon
all of these
Metals can be easily shaped into wires. This property of metals is called
malleability
ductility
thermal conductivity
none of these
Sodium reacts vigorously with water and oxygen, and produces so much heat that it catches fire! That’s why sodium is stored in
water
alcohol
kerosene
oil
Silicon and carbon are solids; bromine is a
gas
liquid
exist in both the form
solid
Which properties do metalloids have?
of metals
of non-metals
of metals and non-metals both
none of the above
Which is the most reactive metal among the following?
mercury
copper
sodium
gold
When a more reactive metal displaces a less reactive metal from its salt solution, the process is called?
Reactivity series
Electroplating
Displacement reaction
Activity series
Which is the hardest non metal
carbon
diamond
graphite
iodine
non-metal used in filling electric bulbs
helium
argon
krypton
xenon
thermite is a mixture of
iron oxide and aluminium powder
aluminium oxide and iron powder
iron oxide and zinc powder
zinc oxide and iron powder
Assertion: when magnesium is burnt in air, it burns with a shiny white flame and produces a white powder of magnesium oxide.
Reason: metals react with oxygen to form oxides.
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Both Assertion and Reason are true and Reason is not the correct explanation of Assertion.
Assertion is false, reason is true
both are false
Assertion: Phosphorous is used in the vulcanization of rubber.
Reason: Plants use nitrogen to prepare proteins.
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Both Assertion and Reason are true and Reason is not the correct explanation of Assertion.
assertion is false, reason is true
both are false
Assertion: plastics are obtained from the natural fibres.
Reason: thermosetting plastics are the plastics which melt or become soft on heating and harden when cooled
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Both Assertion and Reason are true and Reason is not the correct explanation of Assertion.
assertion is false, reason is true
both are false.
Assertion: Acrylic is used for making shawls and sweaters.
Reason: Acrylic resembles wool.
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Both Assertion and Reason are true and Reason is not the correct explanation of Assertion.
assertion is false, reason is true
both are false
Assertion: bacteria is used in the treatment of sewage water.
Reason: Microorganisms can decompose the dead and decaying matter.
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Both Assertion and Reason are true and Reason is not the correct explanation of Assertion.
assertion is false, reason is true
both are false
Assertion: The process of conversion of sugar in the absence of oxygen into alcohol is called pasteurization.
Reason: The method of preserving milk is called pasteurization.
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Both Assertion and Reason are true and Reason is not the correct explanation of Assertion.
assertion is false, reason is true.
both are false.
Assertion: supplying water to the crops in the fields at specific intervals is called irrigation.
Reason: Manures increases the number of soil friendly microbes in the soil
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Both Assertion and Reason are true and Reason is not the correct explanation of Assertion.
assertion is false. reason is true.
both are false.
