1. When the joints are prominent and extending for considerable depth they are called ___________
a) Continuous joints
b) Discontinuous joints
c) Deep joints
d) Prominent joints
Explanation: The joints which are quite prominent and extending for considerable depth and thickness are called as continuous joints
2. What are the continuous joints also called?
a) Uniform joints
b) Normal joints
c) Prime joints
d) Master joints
Explanation: The continuous joints are also called often as master joints. Almost all joints are discontinuous in the strict sense because these disappear with depth in the crust of the earth.
3. The streaks or bands filling material in the rocks are called ___________
a) Colour pigments
b) Resins
c) Veins
d) Pores
Explanation: In many cases, open joints get filled up by solutions of secondary materials that crystallize or precipitate there forming thin or thick streaks or bands of the filling material. These are simply called veins.
4. When the thickness is greater than 20 cm, the veins area called ___________
a) Thick veins
b) Fissure veins
c) Joint veins
d) Broad veins
Explanation: The thin or thick filling material in the joints of the rocks are called as veins when thin and when their thickness exceeds 20 cm they are called fissure veins.
5. Joints do not have dip and strike.
a) False
b) True
Explanation: Joints have dip and strike, the dip being their inclination with the horizontal and the strike being the direction of intersection of a joint plane with a horizontal plane.
6. Pick the wrong statement.
a) A joint set is a group of joint surfaces
b) The surfaces trend in same direction
c) The surfaces have almost same dip
d) The joint surfaces do no trend in same direction
Explanation: A joint set is a group of two or more joint surfaces trending in the same direction with almost the same dip.
7. Group of joint sets are called ___________
a) Joint system
b) Joint group
c) Joint class
d) Joint collection
Explanation: A joint system is a group of two or more joint sets. A joint set is a group of two or more joint surfaces trending in same direction with almost the same dip.
8. The classification which is not considered under study is ___________
a) Spatial relationship
b) Number of joints
c) Geometry
d) Genesis
Explanation: Joints have been classified on the basis of spatial relationships, geometry and genesis.
9. The type of joint which can be measured and mapped easily is ___________
a) Systematic joints
b) Non-systematic joints
c) Irregular joints
d) Homogenous joints
Explanation: Systematic joints show a distinct regularity in their occurrence which can be measured and mapped easily.
10. Example of systematic joints are ___________
a) Columnar joints
b) Mural joints
c) Sheet joints
d) Columnar and mural joints
Explanation: Systematic joints occur in parallel or sub-parallel joint sets that are represented in the rocks at regular intervals. The columnar joints and the mural joints are examples of regular or systematic jointing.