Rocks are generally classified into 3 catagory :

• Geological type of classification
• Physical type of classification
• Chemical type of classification

Geological classification has some sub classifications that is Igneous , Sedimentry , Metamorphic rocks.

Physically classified rocks also have sub divisions as stratified and unstrafied.

Chemical classification has its Calcareous , Argillaceous , and Silicious as sub divisions.

Lets do some Multiple choice questions for better understanding,

Q1. In the given options can you select unstratified rocks?

1. Marble

2. Slate

3. Limestone

4. sandstone

Correct answer is Marble because of its physical classification and its state.

Q2. Rocks which have tendency to split along its definite directions can be called as ?

1. Stratified rocks

2. Un stratified rocks

3. Foliated rocks

4. none of the above

Correct answer is foliated rocks , all metamorphic rocks will considered this category.

Q3. the below 4 options there is a rock guess it.

1. Gypsum

2. Mica

3. Quartz

4. Trap

Correct answer is Trap, because trap is a unstratified type of classification and zypsum,qquartz,mica are the inorganic solid forms and naturally occuring material formed by geological process.

Q4. these are formed beneath the earth surface after cooling and crystallization of magma.

1. Basalt

2. Andesite

3. Granite

4. sandstone

Correct answer is Granite . here Basalt and Andesite are volcanic extrusive material and these are formed at the earth surface after cooling and crystallization of magma.

Q5. Hardness of rock can be tested by?

1. Acid test

2. Smiths test

3. Schmidth hammer test

4. Crystallization test

Correct answer is Schmidth hammer test,  because schmidth hammer rebound test has developed to know the compressive strength of concrete and hardness and compressive strength of rock material can be determined by this test, this instrument can be used or carried out easily in labaratory and also in field.

Q6. A good building stone has its crushing strength more than

1. 1500 kg/cm2

2. 500 kg/cm2

3. 2000 kg/cm2

4. 100 kg/cm2

Correct answer is 1000 kg/cm2,  generally this test is carried out by cutting three cubes in 40x40x40mm in size and tested 3 cubes in saturated condition about 72 hours , load bearing surface is covered by 5mm thickness plywood.