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Biological Sciences
50
Modern Materials
21
Atomic Structure
87
Energy Resources
43
Elements and Substances
76
Plant Photosynthesis and Respiration
52
Space and Solar System
230
General Science for Class 6
1155
General Science for Class 7
2197
General Science for Class 8
0
Basics of Electricity
28
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Physical and Chemical Changes
In electric field, “PVC” is used to make
pipes
wire cover
tungsten wire
switches
Author:
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Physical and Chemical Changes
The short form of “Polyvinyl chloride” is
PVCl
PViCl
PVC
PoViCl
Author:
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Dispersion of Light
The critical angle for ice is
47 Degree
49 Degree
50 Degree
45 Degree
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Digestive System
The acid in the stomach provides
acidic medium for enzymes
space for more food
alkaline medium for enzymes
nutrients to food
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Sound Waves
Ultrasound is used instead of x-rays because x-rays can
damage body cells
damage the body
damage the vessels
stimulate the growth of cancer cells
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Electric Circuits and Currents
Steel cans are made of
lead
tinplate
tungsten
cobalt
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Feeding Relationships and Environment
To adopt the natural ways for survival, is known as
adaptation
survivalism
adoptation
survival
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Dispersion of Light
‘Refractive index’ of silicon is
2.34
3.22
4.01
4.02
Author:
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Comment
Electric Circuits and Currents
When there is high current, the circuit breaker is switched off because of
electromagnetic strength
magnetic strength
electric strength
energy of voltage
Author:
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Comment
Physical and Chemical Changes
As compare to low density polythene, the high density polythene is
weak
strong
rough
soft
Author:
rikazzz
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