Q: Heat transfer horizontally within the atmosphere is called:

A: conduction

B: convection

C: absorption

D: advection



Correct Option: D  [ advection ]

Remark:


Q: CNG stands for:

A: Compressed Natural Gasoline

B: Compressed Natural Gas

C: Compressed Nitrogen Gas

D: Compressed Neon Gas



Correct Option: B  [ Compressed Natural Gas ]

Remark:

Explanation: CNG stands for Compressed Natural Gas. It is an eco-friendly fuel made primarily of methane (CH₄) and is used as an alternative to petrol and diesel. CNG burns cleanly, producing fewer pollutants and helping reduce air pollution.


Q: Main constituents of biogas are:

A: Methane and carbon monoxide

B: Butane and carbon monoxide

C: Methane and carbon dioxide

D: Ethylene and carbon dioxide



Correct Option: C  [ Methane and carbon dioxide ]

Remark:

Explanation: The main constituents of biogas are methane (CH₄) and carbon dioxide (CO₂). Biogas is produced through the anaerobic decomposition of organic matter such as animal dung and plant waste. Methane acts as the primary combustible component, making biogas an efficient and renewable source of energy.


Q: J J Thomson received the Nobel Prize in Physics for the discovery of ________.

A: Protons

B: Electrons

C: Neutrons

D: Positrons



Correct Option: B  [ Electrons ]

Remark:


Q: The digested food is absorbed in

A: Stomach

B: Intestine (small)

C: Intestine (large)

D: Colon



Correct Option: B  [ Intestine (small) ]

Remark:

Explanation: The small intestine is the primary site of absorption of digested food. Its inner lining has numerous tiny finger-like projections called villi and microvilli that greatly increase the surface area for absorption. Nutrients such as glucose, amino acids, fatty acids, vitamins, and minerals pass into the blood and lymph through these structures. The large intestine mainly absorbs water and fo


Q: The number of protons in an alpha particle is :

A: one

B: two

C: three

D: four



Correct Option: B  [ two ]

Remark:

Explanation: An alpha particle (α-particle) is a positively charged particle that consists of two protons and two neutrons, the same as the nucleus of a helium atom (He²⁺). It carries a +2 charge because of the two protons and has a mass number of 4. Alpha particles are emitted during the radioactive decay of heavy elements such as uranium, radium, and thorium. They have high ionizing power but low penetration ability and can be stopped by a sheet of paper or human skin.


Q: Insulin is secreted by :

A: Pancreas

B: Liver

C: Gall Bladder

D: Kidney



Correct Option: A  [ Pancreas ]

Remark:

Explanation: Insulin is a hormone secreted by the beta (β) cells of the Islets of Langerhans in the pancreas. Its main function is to regulate the blood glucose level by promoting the uptake of glucose into cells and converting excess glucose into glycogen in the liver and muscles. A deficiency or lack of insulin causes diabetes mellitus, leading to high blood sugar levels. The pancreas also secretes glucagon, which performs the opposite function by increasing blood glucose levels.


Q: What does the airbag, used for safety of car driver, contain?

A: Sodium bicarbonate

B: Sodium azide

C: Sodium nitrite

D: Sodium peroxide



Correct Option: B  [ Sodium azide ]

Remark:


Q: Chiropterochory is a seed dispersal process through

A: Birds

B: Bats

C: Reptiles

D: Insects



Correct Option: B  [ Bats ]

Remark:

Explanation: Chiropterochory comes from the Greek words “chiroptera” (bats) and “chorein” (to spread). It refers to the dispersal of seeds by fruit bats or flying foxes, which feed on fruits and later excrete or drop the seeds away from the parent plant. This process helps in plant reproduction and maintaining forest diversity. Common examples include dispersal of seeds of guava, fig, and


Q: Angle of friction and angle of repose are:

A: equal to each other

B: not equal to each other

C: proportion to each other

D: none of the above



Correct Option: A  [ equal to each other ]

Remark:

Explanation: The angle of friction and the angle of repose are equal to each other. The angle of friction is the angle made by the resultant of the limiting friction and normal reaction with the normal force, while the angle of repose is the maximum angle of an inclined plane at which an object just begins to slide. Both represent the same physical condition of impending motion.
1...