General Science for Class 7

Simple Chemical Reactions
Irreversible changes include
burning of paper
rusting of iron
corrosion of material
all of them
Author: rikazzz Comment
Human Transport System
‘White blood’ cells are made in
liver
bone marrow
spleen
blood
Author: rikazzz Comment
Investigating Space
The shape of the milky way is
spiral
elliptical
irregular
regular
Author: rikazzz Comment
Sound Waves
A reflected sound is known as
reflection of sound
rarefaction
refraction of sound
echo
Author: rikazzz Comment
Transportation in Plants
When temperature of the surroundings increases, the speed of transpiration is also
increased
decreased
remained same
remained unchanged
Author: rikazzz Comment
Heat Transfer
At night, the convection current of land and sea
remains same
stops
is reversed
is converted to radiation current
Author: rikazzz Comment
Respiration and Food Energy
The scientific name for flu is
influenza
diarrhea
pneumonia
saptica
Author: rikazzz Comment
Human Transport System
‘Platelets’ are made in
liver
bone marrow
spleen
blood
Author: rikazzz Comment
Reproduction in Plants
Stigma of wind pollinated flower is
sticky
feathery
plain
dry
Author: rikazzz Comment
Physical and Chemical Changes
‘Plastics’ are
nature made
self made
man made
ion-made
Author: rikazzz Comment

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