Practice MCQ Questions and answers on General Science-GK

The vast resources of unutilised natural gas can be used in the production of fertilisers.

Paper is a thin sheet material produced by mechanically and/or chemically processing cellulose fibres derived from wood, rags, grasses or other vegetable sources in water, draining the water through fine mesh leaving the fibre evenly distributed on the surface, followed by pressing and drying.

Option A: Increase the tensile strength of cement:
This statement is incorrect. Gypsum is not added to cement clinker to increase its tensile strength. Tensile strength is the ability of a material to withstand pulling or stretching forces.

Option B: Decrease the rate of setting of cement:
This statement is correct. Gypsum is added to cement clinker to control the setting time of cement. It acts as a retarder, slowing down the rate at which the cement mixture hardens. This is important for allowing enough time for proper mixing, placing, and finishing of the cement before it sets.

Option C: Facilitate the formation of colloidal gel:
This statement is incorrect. Gypsum does not facilitate the formation of a colloidal gel. Colloidal gels are formed through different processes and materials.

Option D: Bind the particles of calcium silicate:
This statement is incorrect. Gypsum is not added to bind the particles of calcium silicate. The main component of cement clinker is calcium silicate, and gypsum is added for a different purpose, as explained in Option B.

In summary, gypsum is added to cement clinker to decrease the rate of setting, which allows for better handling and working of the cement mixture before it hardens. This ensures that the cement can be properly placed and finished in construction applications.

Soaps are made from the sodium and potassium salts of long chain carboxylic acids.

In the optical glass industry, flint glass is any highly refractive lead-containing glass used to make lenses and prisms. Because it absorbs most ultraviolet light but comparatively little visible light, it is also used for telescope lenses.

Paraffin wax is obtained from petroleum by dewaxing light lubricating oil stocks. It is used in candles, wax paper, polishes, cosmetics, and electrical insulators. It assists in extracting perfumes from flowers, forms a base for medical ointments, and supplies a waterproof coating for wood. In wood and paper matches, it helps to ignite the matchstick by supplying an easily vaporized hydrocarbon fuel.

Inertia: tendency of an object to resist changes in its velocity. An object at rest has zero velocity - and (in the absence of an unbalanced force) will remain with a zero velocity. Such an object will not change its state of motion (i.e., velocity) unless acted upon by an unbalanced force.

BACK TO VILLAGES slogan was given by Mao.

Acquired immunodeficiency syndrome (AIDS) is a chronic, potentially life-threatening condition caused by the human immunodeficiency virus (HIV). By damaging your immune system, HIV interferes with your body's ability to fight infection and disease.

Mid day meal scheme is a scheme introduced by the government to promote basic primary education. The scheme helps to provide better nutrients to the kids by providing food. It is introduced with the intention to increase attendance, retain kids, and also improves nutritional level of the kids.