Chapter 10: Rock Cycle - Science Mcqs for Grade 8 - Set 2

1)   A stone which is used to sooth skin is glassy volcanic rock formed from lava froth is

a. obsidian
b. pumice
c. basalt
d. granite
Answer  Explanation 

ANSWER: pumice

Explanation:
No explanation is available for this question!


2)   Rock which is composed of sand-sized pallets of calcium carbonate formed in shallow water is

a. shelly limestone
b. chalk
c. oolitic limestone
d. all of them
Answer  Explanation 

ANSWER: oolitic limestone

Explanation:
No explanation is available for this question!


3)   Metamorphic rocks are usually

a. morphed
b. compacted
c. layered
d. clustered
Answer  Explanation 

ANSWER: morphed

Explanation:
No explanation is available for this question!


4)   Gneiss has been transformed from

a. sandstone
b. limestone
c. igneous rock
d. shale
Answer  Explanation 

ANSWER: igneous rock

Explanation:
No explanation is available for this question!


5)   Iron-rich igneous rocks are denser than rocks which are rich in

a. silica
b. Sulphur
c. cobalt
d. calcium
Answer  Explanation 

ANSWER: silica

Explanation:
No explanation is available for this question!


6)   A glassy rock having no crystals formed due to less time given is called

a. obsidian
b. pumice
c. basalt
d. granite
Answer  Explanation 

ANSWER: obsidian

Explanation:
No explanation is available for this question!


7)   The rocks which are non-interlocking and porous are

a. sedimentary rocks
b. metamorphic rocks
c. igneous rocks
d. morphic rocks
Answer  Explanation 

ANSWER: sedimentary rocks

Explanation:
No explanation is available for this question!


8)   After eruption of lava a type of rock is obtained called

a. lava rock
b. magma rock
c. volcanic rock
d. molten rock
Answer  Explanation 

ANSWER: volcanic rock

Explanation:
No explanation is available for this question!


9)   Magma which flows out to the surface of Earth during a volcanic eruption is called

a. lava
b. magma
c. volcano
d. molten rock
Answer  Explanation 

ANSWER: lava

Explanation:
No explanation is available for this question!


10)   Metamorphic rocks become magma on melting at high

a. temperatures
b. pressures
c. densities
d. energies
Answer  Explanation 

ANSWER: temperatures

Explanation:
No explanation is available for this question!


11)   Molten rock inside Earth's crust is called

a. lava
b. magma
c. volcano
d. molten rock
Answer  Explanation 

ANSWER: magma

Explanation:
No explanation is available for this question!


12)   The transformed rocks are called

a. sedimentary rocks
b. metamorphic rocks
c. igneous rocks
d. morphic rocks
Answer  Explanation 

ANSWER: metamorphic rocks

Explanation:
No explanation is available for this question!


13)   Quartzite is transformed from

a. sandstone
b. limestone
c. igneous rock
d. shale
Answer  Explanation 

ANSWER: sandstone

Explanation:
No explanation is available for this question!


14)   Fine grained calcium carbonate layer of rock formed from micro-organisms is

a. Shelly limestone
b. chalk
c. oolitic limestone
d. all of them
Answer  Explanation 

ANSWER: chalk

Explanation:
No explanation is available for this question!


15)   A comparison between metamorphic rock and its parent rock will yield different

a. mineral content
b. texture
c. structure
d. all of them
Answer  Explanation 

ANSWER: all of them

Explanation:
No explanation is available for this question!


16)   A which is mainly composed of fossils cemented by calcium carbonate is

a. Shelly limestone
b. chalk
c. oolitic limestone
d. all of them
Answer  Explanation 

ANSWER: Shelly limestone

Explanation:
No explanation is available for this question!


17)   A comparison between marble and limestone shows marble is more

a. vulnerable
b. harder
c. weaker
d. smaller
Answer  Explanation 

ANSWER: harder

Explanation:
No explanation is available for this question!


18)   Ashes and rock fragments cool and settle on earth's surface can form volcanic rock like

a. tuff
b. pumice
c. obsidian
d. granite
Answer  Explanation 

ANSWER: tuff

Explanation:
No explanation is available for this question!


19)   Iron-rich igneous rock includes

a. granite
b. obsidian
c. basalt
d. all of them
Answer  Explanation 

ANSWER: basalt

Explanation:
No explanation is available for this question!