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8th Grade Science Flashcards | StudBud
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8th Grade Science
8th Grade Science
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1
Which of the following planets rotates clock wise?
Mercury
Venus
Pluto
Jupiter
2
Select the one which is not a mixture
Gasoline
Distilled Water
Air
LPG
3
Plant cells can usually be distinguished because only plant cells possess..
Cell walls and mitochondria
Cell walls and central vacuoles
Chromosomes and mitochondria
Golgi bodies and central vacuoles
4
Which one the following is the most effective carrier for communications?
Microwaves
Cables
Radiowaves
Optical Fibres
5
Which one of the following types of waves are used in a night vision apparatus?
Infra-red waves
None of the above
Microwaves
Radio waves
6
Why is it difficult to see through fog?
Rays of light are scattered by the fog droplets
Light suffers total internal reflection from the fog droplet
Fog droplets absorb light
The refractive index of fog is extremely High
7
The removal of topsoil by water or wind is called
Silting of soil
Soil erosion
Soil creep
Soil wash
8
Which one of the following is not a radioactive element?
Cadmium
Thorium
Uranium
Radium
9
Which is the longest?
Dekameter
Kilometer
Centimeter
Terameter
10
Which one of the following is correct? A concrete wall generally, ...
only transmits sound
only absorbs sound
absorbs and transmits sound
only reflects sound
11
Pollination by wind is called
anemophily
autogamy
entomophily
ornithophily
12
Plants get their nitrogen from ..
Soil
Rain
Bedrock
Air
13
Who gave the first evidence of the Big- Bang theory?
Stephen Hawking
Albert Einstein
S. Chandrasekhar
Edwin Hubble
14
Biomass energy is ..
is effective in only certain regions of India
caused by heat due to the large mass of the earth
formed through photosynthesis
has been used for only a few years
15
The gas predominantly responsible for global warming is ..
Carbon Monoxide
Carbon Dioxide
Nitrous Oxide
Nitrogen Peroxide
16
The intensity of Earthquakes is measured on
Beaufort scale
Mercalli scale
Richter scale
Secant scale
17
Chemically, lime water is ..
Calcium carbonate
Sodium carbonate
Sodium hydroxide
Calcium hydroxide
18
The blue color of the clear sky is due to ..
Dispersion of light
Refraction of light
Diffraction of light
Reflection of light
19
The hardest substance available on earth is ..
Quartz
Diamond
Platinum
GOld
20
Steel is composed of a number of elements. The two essential elements are iron and ..
Carbon
Aluminum
Nickel
Silicon
