| 11. | Ground circle means – |
A. Earth’s interior | |
B. core of earth | |
C. top of the earth | |
D. Earth’s outer crust |
| 12. | How much has the thickness of the lithosphere been measured on the basis of seismic waves? |
A. 105 km | |
B. 100 km | |
C. 200 km | |
D. 80 km |
| 13. | Which of the following layer is called Berisphere? |
A. uppermost layer of the atmosphere | |
B. Earth’s top layer | |
C. Earth’s innermost layer | |
D. earth’s middle layer |
| 14. | What is the rate of increase of temperature with depth on going from the surface to the ground? |
A. 1 °C per 165 m | |
B. 1°C per 165 feet | |
C. 1 °C per 32 m | |
D. 1°C per 32 feet |
| 15. | According to the internal structure of the earth, the earth has been divided into crust, mantle and core, whose division is this? |
A. Holmes | |
B. Jefferies | |
C. deli | |
D. Grant |
| 16. | Which of the following statement is false? |
A. The average thickness of the earth’s crust is about 33 km. | |
B. The thickness of the earth’s crust is more in the continental part while it is shallow in the oceanic part. | |
C. The continental crust is mainly composed of granite rocks. | |
D. The density of the continental crust is higher than that of the oceanic crust. |
| 17. | What type of rocks is the ocean floor made of? |
A. Granite | |
B. basalt | |
C. Flaky | |
D. gabbro |
| 18. | Which of the following statements is incorrect regarding mantle? |
A. Its depth is 35 km. 2900 km from is up to | |
B. Its entire parts are in plastic condition. | |
C. Mantle constitutes 83.5% of the Earth’s volume and 67.8% of its mass. | |
D. Its density ranges from 3.0 to 5.5. |
| 19. | Lithosphere includes – |
A. crust only | |
B. both upper crust and lower crust | |
C. upper crust, lower crust and the solid upper part of the mantle | |
D. none of these |
| 20. | How many km is the extent of the lithosphere? Is it up to the depth of? |
A. 80 km | |
B. 100 km | |
C. 180 kms. | |
D. 200 km |