General Science for Class 7

Investigating Space
The temperature at the center of sun is about
40,000 °C
50,000 °C
15 millions °C
150,000 °C
Author: rikazzz Comment
Physical and Chemical Changes
Chemical changes are also known as
physical reactions
chemical reactions
biological reactions
prominent reactions
Author: rikazzz Comment
Electric Circuits and Currents
A doorbell and electric bell use
magnets
current
electromagnets
resistors
Author: rikazzz Comment
Dispersion of Light
Our brain mixes the colors by
mixing the rods
mixing the cones
combining the signals from rods
combining the signals from cones
Author: rikazzz Comment
Reproduction in Plants
The male reproductive part of a flower is known as
carpel
stamen
petal
sepal
Author: rikazzz Comment
Investigating Space
In a plane mirror, light is reflected through
eyepiece lens
convex lens
concave lens
light mirror
Author: rikazzz Comment
Sound Waves
The note also depends on
diameter of the drum
thickness of string
tension of string
distance of wind holes
Author: rikazzz Comment
Heat Transfer
Low ‘infrared waves’
cannot pass through glass
can pass through glass
cannot pass through walls
can pass through walls
Author: rikazzz Comment
Solutions
The elements in air that are responsible for acid rain include
oxides of nitrogen
sulphur dioxide
carbon dioxide
both a and b
Author: rikazzz Comment
Electric Circuits and Currents
‘ELCB’is an
electronic switch
electromagnetic switch
electric appliance
electric bulb
Author: rikazzz Comment

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