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: Who invented vaccination for 'small pox'?

A: Sir Fredrick Grant Banting

B: Sir Alexander Fleming

C: Edward Jenner

D: Louis Pasteur



Correct Option: C  [ Edward Jenner ]

Remark:

Explanation: Edward Jenner, an English physician, is known as the “Father of Immunology.” In 1796, he observed that milkmaids who had previously suffered from cowpox (a mild disease) did not contract smallpox (a deadly viral disease). He tested his hypothesis by injecting a boy with material taken from a cowpox sore and later exposing him to smallpox — the boy did not develop the disease. This led to the development of the first vaccine, derived from the Latin word vacca meaning “cow.”

Significance: Jenner’s discovery laid the foundation of modern immunology and preventive medicine. Smallpox was officially declared eradicated by the WHO in 1980.


Q: Bronchitis is a disease of :

A: Blood

B: Liver

C: Intenstine

D: Respiratory track



Correct Option: D  [ Respiratory track ]

Remark:

Explanation: Bronchitis is an inflammation of the bronchial tubes, which are the air passages of the respiratory tract that carry air to and from the lungs. The condition causes coughing, mucus production, chest discomfort, and difficulty in breathing. It can be caused by viral or bacterial infections, long-term exposure to smoke, dust, or air pollutants. Chronic bronchitis is a serious form often associated with smoking and is part of a group of lung diseases known as COPD (Chronic Obstructive Pulmonary Disease).


Q: The mixture of flammable gases (carbon monoxide and hydrogen) and nonflammable gases (nitrogen and carbon dioxide) is called by what name?

A: Laser Star Gas

B: Breathing Gas

C: Producer Gas

D: Laughing Gas



Correct Option: C  [ Producer Gas ]

Remark:

Explanation: Producer gas is a mixture of flammable gases such as carbon monoxide (CO) and hydrogen (H₂), along with nonflammable gases like nitrogen (N₂) and carbon dioxide (CO₂). It is produced by the partial combustion of carbon-containing fuels (like coal or coke) with air and steam, and is used as a fuel in industrial furnaces.


Q: Who discovered electromagnetic nature of light?

A: Young

B: Snell

C: Newton

D: Maxwell



Correct Option: D  [ Maxwell ]

Remark:


Q: Which of the following cells produce immune response in human body ?

A: Red blood cells

B: White blood cells

C: Epithelical cells

D: Adipose cells



Correct Option: B  [ White blood cells ]

Remark:

Explanation: White blood cells (WBCs), also known as leukocytes, are responsible for producing the immune response in the human body. They defend against infections by attacking bacteria, viruses, and other foreign invaders, helping to maintain the body’s immunity.


Q: Which one of the following is a chemical change?

A: Melting of ice

B: Magnetising of Iron

C: Burning of coal

D: None of these



Correct Option: C  [ Burning of coal ]

Remark:
A chemical change, also called a chemical reaction, happens when substances combine or break apart to form entirely new substances with different properties.


Q: Restarting of computer that is already on is referred to as:

A: Cold booting

B: Logging off

C: Shut down

D: Warm booting



Correct Option: D  [ Warm booting ]

Remark:
A warm boot refers to the process of restarting a computer system without completely shutting down the power.


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: Full form of "GPS" is

A: Geographic Pointing System

B: Global Positioning System

C: Geographic Photo Sensor

D: Global Polar Synchronization



Correct Option: B  [ Global Positioning System ]

Remark:

Explanation: The full form of GPS is Global Positioning System. It is a satellite-based navigation system that provides accurate information about the location, speed, and time anywhere on Earth. Developed by the U.S. Department of Defense, GPS uses a network of at least 24 satellites orbiting the Earth. It is widely used in navigation, mapping, military operations, aviation, and smartphone tracking applications.

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