Q: Acid rain is caused by

A: Humidity

B: Pollutant gases

C: Population explosion

D: None of these



Correct Option: B  [ Pollutant gases ]

Remark:

Explanation: Acid rain is caused by the presence of pollutant gases such as sulphur dioxide (SO₂) and nitrogen oxides (NOₓ) in the atmosphere. These gases are released mainly from burning of coal, oil, and industrial emissions. When they combine with water vapor in the atmosphere, they form sulphuric acid (H₂SO₄) and nitric acid (HNO₃), which fall to the ground as acid rain. It damages soil, plants, aquatic life, and even buildings and monuments made of marble or limestone.


Q: Animals living in the tree trunks are known as:

A: arboreal

B: Volant

C: Amphibious

D: Aquatic



Correct Option: A  [ arboreal ]

Remark:

Explanation: Animals that live in or on trees are called arboreal animals. They are adapted to climbing and moving about among branches. Examples include monkeys, squirrels, chameleons, and tree frogs. Their adaptations may include grasping limbs, prehensile tails, claws, or adhesive pads that help them cling to tree surfaces and move efficiently among branches.


Q: Who discovered Electron?

A: Enrico Fermi

B: Robert Noyce

C: J.J.Thomson

D: James Dyson



Correct Option: C  [ J.J.Thomson ]

Remark:

The electron was discovered by J. J. Thomson in 1897 during his experiments with cathode rays. He demonstrated that cathode rays are composed of tiny negatively charged particles, which he named electrons. This discovery revolutionized atomic theory and led to the development of the plum pudding model of the atom, where electrons are embedded in a positively charged sphere.

Other options (for context)

  • Enrico Fermi: Known for his work on nuclear physics and the development of the first nuclear reactor.
  • Robert Noyce: Co-inventor of the integrated circuit (microchip).
  • James Dyson: Inventor of the modern vacuum cleaner, not a physicist.


Q: Malaria is transmitted from one person to another by:

A: Aedes Mosquito

B: Culex Mosquito

C: Anopheles Mosquito

D: All of the above



Correct Option: C  [ Anopheles Mosquito ]

Remark:

Explanation: Malaria is caused by the protozoan parasite Plasmodium (species such as *P. vivax*, *P. falciparum*, *P. malariae*, and *P. ovale*). It spreads through the bite of an infected female Anopheles mosquito. The mosquito injects sporozoites (infective stage of *Plasmodium*) into the human bloodstream. These parasites infect liver cells, multiply, and later invade red blood cells, causing symptoms like fever, chills, and


Q: The first nuclear test conducted by India under the code name of "Smiling Buddha" was in the year:

A: 1973

B: 1974

C: 1975

D: 1976



Correct Option: B  [ 1974 ]

Remark:


Q: When a moving bus suddenly stops, passengers sitting inside leans forward. This is due to

A: Conservation of Mass

B: Inertia of rest

C: Inertia of Motion

D: None of these



Correct Option: C  [ Inertia of Motion ]

Remark:
Inertia of motion is defined as the property of a body to resist any change to its state of uniform motion.


Q: The growth of bacteria is measured by:

A: hemocytometer

B: spectrophotometer

C: calorimeter

D: auxanometer



Correct Option: B  [ spectrophotometer ]

Remark:

Explanation: The spectrophotometer measures bacterial growth by determining the optical density (OD) or turbidity of a culture. As bacteria multiply, the suspension becomes more turbid and absorbs more light. The absorbance value is proportional to the number of bacterial cells present.


Q: In medical terminology, USG stands for:

A: Undersized gland

B: Ultrasonography

C: Unsegmented gonads

D: None of the above



Correct Option: B  [ Ultrasonography ]

Remark:

In medical terminology, USG stands for Ultrasonography. It is a diagnostic imaging technique that uses high-frequency sound waves to create images of internal organs, tissues, and developing fetuses. USG is commonly used in obstetrics, cardiology, and abdominal examinations as it is safe and non-invasive.

  • Undersized gland: Not a recognized medical term.
  • Unsegmented gonads: Incorrect and unrelated to imaging.
  • None of the above: Incorrect as option B is correct.


Q: The animal group that is not found in marine water:

A: Mammals

B: Amphibia

C: Reptiles

D: Aves



Correct Option: D  [ Aves ]

Remark:

Explanation: Marine environments support various groups of animals including mammals (whales, seals), reptiles (sea turtles, sea snakes), and numerous invertebrates. However, birds (Aves) are air-breathing terrestrial vertebrates. While certain birds like penguins, pelicans, and seagulls feed or swim in the ocean, they do not permanently live in marine water or breathe underwater — thus, they are not considere


Q: PINAKA often seen in news, is a / an:

A: Anti-submarine torpedo and research vehicle

B: Aircraft carrier

C: Multi barrel Rocket Launch (MBRL) system

D: Guided missile frigate submarine warship



Correct Option: C  [ Multi barrel Rocket Launch (MBRL) system ]

Remark:

PINAKA is an indigenously developed Multi Barrel Rocket Launch (MBRL) system designed and produced by the Defence Research and Development Organisation (DRDO) of India. It is capable of firing a salvo of rockets to deliver explosive warheads over large areas with high accuracy. Pinaka is primarily used by the Indian Army for long-range artillery support and has a range of up to 75 km in its upgraded version (Pinaka Mk-II).

Other options (for context)

  • Anti-submarine torpedo and research vehicle: Refers to underwater weapon systems, not related to Pinaka.
  • Aircraft carrier: A large naval vessel capable of carrying aircraft; Pinaka is not a ship.
  • Guided missile frigate submarine warship: Refers to naval warships, not a land-based rocket launcher.
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