Q: Which of the following is not a property of acids ?

A: All acids have sour taste

B: All acids are corrosive in nature

C: For acidic solutions pH = <7

D: Acids turn red litmus to blue



Correct Option: D  [ Acids turn red litmus to blue ]

Remark:

Explanation: Acids do not turn red litmus to blue; instead, they turn blue litmus paper red. Acids are sour in taste, corrosive in nature, and have a pH value less than 7. Therefore, the statement that acids turn red litmus to blue is incorrect.


Q: The addition of gypsum to Portland cement helps in:

A: increasing the strength of cement

B: rapid setting of cement

C: preventing rapid setting of cement

D: reducing in the cost of cement



Correct Option: C  [ preventing rapid setting of cement ]

Remark:


Q: What is the temperature when density of water is the highest

A: 5 degree Celsius

B: 6 degree Celsius

C: 4 degree Celsius

D: 3 degree Celsius



Correct Option: C  [ 4 Degree Celsius ]

Remark:

Explanation: Water shows an unusual property known as anomalous expansion. Its density is maximum at 4°C. When cooled from higher temperatures, water contracts till 4°C, becoming denser. Below 4°C, it expands instead of contracting, so its density decreases. This property allows ice to float and prevents water bodies from freezing solid, protecting aquatic life during winters.


Q: Which of the following is not a viral disease ?

A: Tuberculosis

B: Polio

C: Swine flu

D: Hepatitis



Correct Option: A  [ Tuberculosis ]

Remark:

Explanation: Tuberculosis (TB) is not a viral disease; it is caused by a bacterium called Mycobacterium tuberculosis. In contrast, Polio, Swine flu, and Hepatitis are viral diseases caused by different types of viruses.


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.


Q: The art and science of map making is called:

A: remote sensing

B: cartography

C: photogrammetry

D: mapping



Correct Option: B  [ cartography ]

Remark:


Q: 'Mesothelioma' is caused by toxicity of

A: Arsenic

B: Lead

C: Mercury

D: Asbestos



Correct Option: D  [ Asbestos ]

Remark:

Explanation: Asbestos is a group of naturally occurring fibrous silicate minerals once widely used in construction and insulation. When inhaled, asbestos fibers accumulate in the lungs and pleura, leading to inflammation and scarring over years. This chronic exposure can cause asbestosis (lung fibrosis) and mesothelioma — a deadly cancer of the membrane lining the lungs (pleura) or abdomen (peritoneum).


Q: The process by which energy is generated in the Sun is :

A: Nuclear fusion

B: Nuclear fission

C: Both nuclear fusion and nuclear fission

D: The burning of gases



Correct Option: A  [ Nuclear fusion ]

Remark:

Explanation: The Sun produces its enormous energy through the process of nuclear fusion. In this process, hydrogen nuclei (protons) combine under extremely high temperature and pressure to form helium, releasing a tremendous amount of energy in the form of light and heat. The main fusion reaction in the Sun is the proton–proton chain. Unlike fission (splitting of nuclei), fusion combines light nuclei, and this is what powers all stars, including the Sun.


Q: A car is moving on a road and rain is falling vertically. Select the correct answer:

A: The rain will strike the wind screen only

B: The rain will strike the front screen only

C: The rain will strike both the screens

D: The rain will not strike any of the screens



Correct Option: B  [ The rain will strike the front screen only ]

Remark:

Explanation: When a car moves forward while rain is falling vertically, the rain appears to fall at an angle relative to the car’s motion. As a result, the raindrops strike the front windscreen of the car, not the rear screen. This is due to the relative velocity between the car and the falling rain.


Q: The phenomenon of light associated with the appearance of the blue Colour of the sky is:

A: interference

B: reflection

C: refraction

D: scattering



Correct Option: D  [ scattering ]

Remark:

Explanation: The blue colour of the sky is due to the scattering of sunlight by molecules and small particles in the Earth's atmosphere. Shorter wavelengths of light (blue and violet) are scattered more than longer wavelengths (red and yellow). Since our eyes are more sensitive to blue light, the sky appears blue.

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