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The Mohorovičić discontinuity is named after a Croatian seismologist.
- True
- False
Answer: True
The Mohorovičić discontinuity (Moho) is named after Croatian seismologist Andrija Mohorovičić, who discovered it in 1909. It marks the boundary between Earth's crust and mantle, identified by a sudden increase in seismic wave velocity.
The Shivalik Hills are the outermost range of the Himalayas.
- True
- False
Answer: True
The Shivalik Hills (Outer Himalayas) are the southernmost and youngest range of the Himalayas, formed 2-20 million years ago. They are composed of unconsolidated sediments and are prone to landslides. The Shivaliks extend from Jammu to Assam.
The Red Sea separates Africa and Asia.
- True
- False
Answer: True
The Red Sea separates Africa (Egypt, Sudan, Eritrea) from Asia (Saudi Arabia, Yemen). It connects to the Mediterranean via the Suez Canal and to the Indian Ocean via the Bab el-Mandeb Strait. The sea is known for its high salinity and coral reefs.
India is the largest producer of castor oil seeds in the world.
- True
- False
Answer: True
India is the largest producer of castor oil seeds globally, contributing about 80% of world production. Major producing states are Gujarat, Rajasthan, and Andhra Pradesh. Castor oil is used in pharmaceuticals, lubricants, and biodiesel.
The Western Coastal Plain is narrower than the Eastern Coastal Plain.
- True
- False
Answer: True
The Western Coastal Plain (50-80 km wide) is narrower than the Eastern Coastal Plain (100-130 km wide). The Western Plain is bordered by the steep Western Ghats, while the Eastern Plain has wider deltas formed by major rivers.
Peaty soil is found in areas of high rainfall and humidity.
- True
- False
Answer: True
Peaty soil forms in areas of high rainfall and humidity where organic matter accumulates faster than it decomposes. Found in Kerala, Tamil Nadu, and parts of Bihar. It is acidic, dark in color, and suitable for paddy and jute cultivation.
The ionosphere is part of the thermosphere and reflects radio waves.
- True
- False
Answer: True
The ionosphere is a region within the thermosphere (60-1,000 km altitude) containing ionized particles that reflect radio waves, enabling long-distance communication. It is affected by solar activity and causes auroras near the poles.
The Tropic of Cancer passes through Mexico.
- True
- False
Answer: True
The Tropic of Cancer (23.5°N) passes through Mexico, dividing it into tropical and subtropical zones. It also passes through 15 other countries including India, Saudi Arabia, and China. The line marks the northernmost point where the Sun can be directly overhead.
The 'Bardoli Chheerha' is a pre-monsoon wind in Assam.
- True
- False
Answer: True
Bardoli Chheerha is a local pre-monsoon wind in Assam that brings moisture from the Bay of Bengal. It occurs in April-May and helps in tea cultivation. These winds are part of the complex monsoon system affecting Northeast India.
The Antarctic continent has no permanent human residents.
- True
- False
Answer: True
Antarctica has no permanent human residents due to its extreme climate. Only scientists and support staff live temporarily in research stations. The Antarctic Treaty (1959) designates the continent for peaceful scientific research.
The Oldham discontinuity is within the Earth's inner core.
- True
- False
Answer: False
The Oldham discontinuity is not a recognized seismic discontinuity. The major discontinuities are Moho (crust-mantle), Gutenberg (mantle-core), and Lehmann (outer-inner core). Named after seismologist Richard Oldham who discovered Earth's core.
The Javadi Hills are located in Tamil Nadu.
- True
- False
Answer: True
The Javadi Hills are located in Tamil Nadu, forming part of the Eastern Ghats. They are rich in mineral resources and forests. The hills are a source of several rivers and support agriculture and tribal communities.
The Caspian Sea is the largest lake in the world by surface area.
- True
- False
Answer: True
The Caspian Sea is the largest lake in the world by surface area (371,000 sq km), though it is called a 'sea' due to its size and salinity. It is landlocked, bordered by five countries, and rich in oil and gas resources.
India is the largest producer of brinjal (eggplant) in the world.
- True
- False
Answer: True
India is the largest producer of brinjal (eggplant) globally, contributing about 25% of world production. Major producing states are West Bengal, Odisha, and Bihar. Brinjal is a warm-season vegetable rich in antioxidants.
India has the third-largest railway network in the world.
- True
- False
Answer: True
India has the third-largest railway network in the world after USA and China, spanning over 68,000 km. Indian Railways is a major employer and critical for passenger and freight transport. It operates under the Ministry of Railways.
The Bullen discontinuity is within the Earth's core.
- True
- False
Answer: True
The Bullen discontinuity, at about 5,150 km depth, marks the boundary between Earth's liquid outer core and solid inner core. It is named after seismologist Keith Bullen. This boundary is critical for understanding Earth's magnetic field generation.
The Mikir Hills are located in Assam.
- True
- False
Answer: True
The Mikir Hills (now called Karbi Anglong) are located in Assam, forming part of the Meghalaya Plateau extension. The region is rich in biodiversity and home to the Karbi tribe. It receives heavy rainfall from the Southwest Monsoon.
The Drake Passage separates South America and Antarctica.
- True
- False
Answer: True
The Drake Passage is the body of water between South America's Cape Horn and the South Shetland Islands of Antarctica. It connects the Atlantic and Pacific Oceans and is known for rough seas. Named after English explorer Sir Francis Drake.
India is the largest producer of papaya in the world.
- True
- False
Answer: True
India is the largest producer of papaya globally, contributing about 40% of world production. Major producing states are Andhra Pradesh, Gujarat, and Karnataka. Papaya is rich in vitamins and enzymes, supporting nutrition and rural income.
India has four major biodiversity hotspots within its territory.
- True
- False
Answer: False
India encompasses three biodiversity hotspots: the Himalayas, Western Ghats-Sri Lanka, and Indo-Burma. The Sundaland hotspot extends to the Nicobar Islands but is not primarily in India. These regions have high endemism and face conservation threats.