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# Internal Structure of the Earth Online Exam Quiz

Important questions about Internal Structure of the Earth. Internal Structure of the Earth MCQ questions with answers. Internal Structure of the Earth exam questions and answers for students and interviews.

### Identify the part labelled as “A” in the below diagram.

Options

A : a. Weathered rock

B : b. Parent rock

C : c. Rolled down rock

D : d. Powdered rock

Options

A : a. 50-55 km

B : b. 60-65 km

C : c. 70-75 km

D : d. 30-35 km

### The discontinuity which marks the lower boundary of the crust is ______________

Options

A : a. Crust-Mantle discontinuity

B : b. Oceanic discontinuity

C : c. SIAL layer

D : d. Mohorovicic discontinuity

Options

A : a. SIAL

B : b. SIMA

C : c. SLAM

D : d. SILA

Options

A : a. 3.00 g/cc

B : b. 2.50 g/cc

C : c. 1.90 g/cc

D : d. 2.00 g/cc

Options

A : a. 90-100 km

B : b. 50-60 km

C : c. 70-80 km

D : d. 30-40 km

### What is the speed attained by the P-waves in the C-layer under the Continental crust?

Options

A : a. 6 to 7.6 km/sec

B : b. 3 to 4 km/sec

C : c. 5 to 6.3 km/sec

D : d. 1.8 to 2.5 km/sec

Options

A : a. A-layer

B : b. B-layer

C : c. C-layer

D : d. D-layer

### The expansion of SIMA is ____________

Options

A : a. Silicon and Manganese

B : b. Silicon and Magnesium

C : c. Strontium and Manganese

D : d. Strontium and Magnesium

### The oceanic layer is the extension of C-layer of the continental crust and A and B-layer are mostly absent.

Options

A : a. True

B : b. False

C : c. May be True or False

D : d. Can't say

Options

A : a. A-layer

B : b. B-layer

C : c. C-layer

D : d. D-layer

### The area not considered under the crust is ____________

Options

A : a. Mountainous area

B : b. Continental area

C : c. Oceanic area

D : d. Glacial area

Options

A : a. 2000 km

B : b. 1500 km

C : c. 2900 km

D : d. 1800 km

### The thickness of the 2 layers of the upper mantle is approximately said to be ________

Options

A : a. 400 and 600 km

B : b. 300 and 500 km

C : c. 450 and 800 km

D : d. 300 and 400 km

### The exact nature of the mantle is completely understood.

Options

A : a. True

B : b. False

C : c. May be True or False

D : d. Can't say

### Which of the following is not true about Asthenosphere?

Options

A : a. It is present in the upper mantle

B : b. It is in solid state

C : c. It is the source of volcanic activity

D : d. It is in plastic rather than solid state

### Who was the first person to tell about the Core?

Options

A : a. Graham Bell

B : b. Albert Einstein

C : c. Isaac Newton

D : d. R.D. Oldham

### The depth at which the core layer starts and ends respectively is ____________

Options

A : a. 2900 and 6371 km

B : b. 2000 and 5371 km

C : c. 2500 and 4771 km

D : d. 2000 and 5000 km

### Which of the following is true about the inner core?

Options

A : a. It is believed to be a semi solid body

B : b. It is believed to be a solid body

C : c. It is believed to be a liquid body

D : d. It is believed to be a gaseous body.

Options

A : a. 8 g/cc

B : b. 7.6 g/cc

C : c. 9.9 g/cc

D : d. 8.7 g/cc