Q: Which of the following diseases is caused by H1N1, virus ?

A: Swine flu

B: Dengue

C: AIDS

D: Bird flu



Correct Option: A  [ Swine flu ]

Remark:

Swine Flu is caused by the H1N1 virus, a subtype of the Influenza A virus. It primarily affects the respiratory system and is transmitted from person to person through droplets from coughs or sneezes. Symptoms include fever, cough, sore throat, body aches, and fatigue. The H1N1 pandemic in 2009 was declared a global health emergency by the World Health Organization (WHO).

Other options (for context)

  • Dengue: Caused by the Dengue virus, transmitted by Aedes mosquitoes.
  • AIDS: Caused by the HIV (Human Immunodeficiency Virus), not H1N1.
  • Bird flu: Caused by the H5N1 virus, not H1N1.


Q: Most plants absorb nitrogen in the form of:

A: proteins

B: nitrates and nitrites

C: urea

D: nitrates, nitrites and urea



Correct Option: D  [ nitrates, nitrites and urea ]

Remark:

Explanation: Nitrogen is an essential nutrient for plants, used in the synthesis of amino acids, proteins, nucleic acids, and chlorophyll. Plants absorb nitrogen from the soil primarily in the inorganic forms of nitrate (NO₃⁻) and nitrite (NO₂⁻). Urea, when applied as fertilizer, is first converted by soil bacteria into ammonia (NH₃) and then into nitrates through nitrification before being absorbed by roots.

Key Steps:

  • Ammonification: Conversion of organic nitrogen (from dead plants/animals) into ammonia.
  • Nitrification: Conversion of ammonia into nitrites and then nitrates by bacteria like Nitrosomonas and Nitrobacter.
  • Assimilation: Uptake of nitrates by plants to form amino acids and proteins.


Q: Time during which a job is processed by the computer is:

A: Delay time

B: Real time

C: Down time

D: Execution time



Correct Option: D  [ Execution time ]

Remark:

Explanation: Execution time is the period during which a job or program is actively processed by the computer’s CPU. It refers to the actual time taken to execute instructions, excluding waiting or idle times such as input/output delays or queue time.


Q: The phenomenon of radioactivity was discovered by:

A: Marie Curie

B: Pierre Curie

C: Henri Becquerel

D: J J Thomson



Correct Option: C  [ Henri Becquerel ]

Remark:

Explanation: The phenomenon of radioactivity was discovered by the French physicist Henri Becquerel in 1896. He accidentally discovered that uranium salts emitted invisible rays that could fog photographic plates, even without sunlight. This led to the realization that certain elements spontaneously emit radiations — a property later termed as radioactivity. Subsequently, Marie and Pierre Curie expanded his work and discovered other radioactive elements like polonium and radium.


Q: The virus infection causes AIDS is known as

A: HIV

B: HID

C: DIV

D: None of theses



Correct Option: A  [ HIV ]

Remark:

Explanation: The disease AIDS (Acquired Immuno Deficiency Syndrome) is caused by the HIV (Human Immunodeficiency Virus). HIV attacks the body’s immune system, specifically the CD4 or T-helper cells, weakening the body’s ability to fight infections and diseases. It spreads through unprotected sexual contact, sharing of infected needles, transfusion of contaminated blood, or from an infected mother to her child during birth or breastfeeding. There is no permanent cure, but antiretroviral therapy (ART) helps control the virus and prolong life.


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: All ships have sonar system. It is used to detect /measure :

A: Distance of the shore

B: Sound on the surface

C: Sound of animals in Sea

D: Depth of ocean



Correct Option: D  [ Depth of ocean ]

Remark:

Explanation: SONAR (Sound Navigation and Ranging) is a system used in ships and submarines to determine the depth of the ocean or to locate underwater objects. It works by sending sound waves into the water and measuring the time taken for the echo to return after reflecting from the seabed or any object.


Q: Thyroid gland is located

A: near the heart

B: at the base of the brain

C: below the liver

D: in the neck region



Correct Option: D  [ in the neck region ]

Remark:

Explanation: The thyroid gland is located in the neck region, just below the larynx (voice box) and in front of the trachea (windpipe). It is a butterfly-shaped endocrine gland that secretes the hormones thyroxine (T₄) and triiodothyronine (T₃). These hormones regulate metabolism, growth, and energy production in the body. The thyroid also produces calcitonin, which helps control calcium levels in the blood. Iodine is essential for the synthesis of thyroid hormones.


Q: Fathom is unit of:

A: Depth

B: Distance

C: Frequency

D: Sound



Correct Option: A  [ Depth ]

Remark:

Explanation: Fathom is a unit used to measure depth, particularly the depth of water in oceans and seas. One fathom is equal to 6 feet or approximately 1.83 meters. It is commonly used in navigation and marine studies.


Q: One of the constitutes of tear gas is:

A: Ethane

B: Ethanol

C: Ether

D: Chloropicrin



Correct Option: D  [ Chloropicrin ]

Remark:
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