Q: Which of the following elements is essential for the transmission of nerve impulses in nerve fibers of human body ?

A: Calcium

B: Iron

C: Sodium

D: Zinc



Correct Option: C  [ Sodium ]

Remark:

Explanation: Sodium (Na⁺) plays a crucial role in the transmission of nerve impulses in the human body. Nerve cells (neurons) transmit signals through an electrochemical process known as the nerve impulse or action potential. During this process, the movement of sodium (Na⁺) and potassium (K⁺) ions across the nerve cell membrane generates an electrical charge. The rapid influx of sodium ions causes depolarization, which allows the nerve impulse to travel along the neuron, ensuring proper communication between the brain, spinal cord, and body.


Q: Boiling point of water inside a sealed pressure cooker is:

A: 100℃

B: 121℃

C: 95℃

D: 0℃



Correct Option: B  [ 121℃ ]

Remark:

Explanation: Inside a sealed pressure cooker, the pressure is higher than atmospheric pressure, which raises the boiling point of water to about 121℃. This allows food to cook faster because water and steam reach higher temperatures than at normal atmospheric pressure.


Q: "Athlete's foot" is:

A: a specific footwear for athletes to prevent them from straining their feet

B: an allergic skin rash

C: a common fungal infection that attacks the skin below the toes

D: an eczema



Correct Option: C  [ a common fungal infection that attacks the skin below the toes ]

Remark:

Explanation: Athlete’s foot, scientifically known as Tinea pedis, is a fungal infection caused mainly by dermatophytes such as Trichophyton species. It thrives in warm, moist areas like the skin between the toes. Symptoms include itching, scaling, redness, and sometimes blistering. It spreads easily in communal areas like locker rooms and swimming pools. Proper hygiene and antifungal treatment can prevent and cure the infection.


Q: When a sound wave goes from one medium to another, the quantity that remains unchanged is:

A: Frequency

B: Amplitude

C: Wavelength

D: Speed



Correct Option: A  [ Frequency ]

Remark:

Explanation: When a sound wave travels from one medium to another, its frequency remains unchanged. However, its wavelength and speed change depending on the properties of the new medium. The constant frequency ensures that the sound maintains the same pitch.


Q: The heart covered by a membrane called

A: Myocardium.

B: Pericardium

C: Aorta

D: None of These



Correct Option: B  [ Pericardium ]

Remark:

Explanation: The heart is enclosed in a double-layered protective membrane called the pericardium. The outer fibrous layer protects the heart and anchors it within the chest cavity, while the inner serous layer secretes pericardial fluid that reduces friction during heartbeats. This fluid-filled sac ensures smooth and cushioned movement of the heart as it contracts and relaxes continuously.


Q: Vinegar is chemically a:

A: diluted citric acid

B: diluted acetic acid

C: diluted hydrochloric acid

D: diluted oxalic aid



Correct Option: B  [ diluted acetic acid ]

Remark:


Q: What is the full form of LAN?

A: Line Area Network

B: Linear Area Network

C: Local Area Network

D: Land Area Network



Correct Option: C  [ Local Area Network ]

Remark:

The full form of LAN is Local Area Network. It is a network that connects computers and devices within a limited geographical area such as a home, office, school, or building. LANs enable data sharing, resource sharing (like printers or internet connections), and communication between connected devices. Common technologies used in LANs include Ethernet and Wi-Fi.

Other options (for context)

  • Line Area Network: Incorrect — not a recognized networking term.
  • Linear Area Network: Incorrect — there is no such standard network type.
  • Land Area Network: Incorrect — misinterpretation of LAN abbreviation.


Q: Which of the following is the largest ecological unit ?

A: Organism

B: Population

C: Biome

D: Ecosystem



Correct Option: C  [ Biome ]

Remark:

The Biome is the largest ecological unit. It includes several ecosystems that share similar climate, vegetation, and animal life. Examples include tundra, desert, rainforest, and grassland. A biome represents a major community of living organisms adapted to a specific environment over large geographical areas.

  • Organism: An individual living being.
  • Population: A group of the same species living in an area.
  • Ecosystem: Includes both living and non-living components, but multiple ecosystems together form a biome.


Q: A concave lens always forms an image which is:

A: Real and erect

B: Virtual and erect

C: Real and inverted

D: Virtual and inverted



Correct Option: B  [ Virtual and erect ]

Remark:

Explanation: A concave lens always forms a virtual, erect, and diminished image, regardless of the position of the object. The image formed appears on the same side of the lens as the object and is used in devices like spectacles for correcting short-sightedness (myopia).


Q: Olive ridley is related to:

A: turtle

B: cease fire violations

C: terrorist killings

D: migratory bird



Correct Option: A  [ turtle ]

Remark:

Explanation: The Olive Ridley turtle (Lepidochelys olivacea) is the smallest and most abundant species of sea turtle found primarily in warm and tropical waters, including the Indian Ocean. It is named for the olive color of its shell. These turtles are famous for their unique mass nesting phenomenon known as “arribada”, where thousands of females come ashore simultaneously to lay eggs. In India, large nesting sites are found along the coast of Odisha, especially at Gahirmatha Beach and the Rushikulya River mouth.

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