Physical Science
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Q101.According to Quark theory, there are ____ elementary particles.
Correct Answer: B
According to the Standard Model (often referenced loosely as 'quark theory'), there are six types (flavors) of quarks.
Q102.Acid rain is mainly caused by emissions of ____ in the atmosphere?
Correct Answer: D
Acid rain is mainly caused by atmospheric emissions of sulfur dioxide and nitrogen oxides, which react with water vapor to form acids.
Q103.Air contains volume of carbon dioxide approximately?
Correct Answer: D
Air contains approximately 0.03-0.04% carbon dioxide by volume.
Q104.An atom is____?
Correct Answer: B
An atom is the smallest particle of an element that retains the chemical properties of that element and can take part in a chemical reaction.
Q105.An element that does not occur in nature but can be produced artificially is____?
Correct Answer: A
Plutonium does not occur naturally in significant amounts and is mainly produced artificially in nuclear reactors.
Q106.Asteroids are made mostly of?
Correct Answer: B
Asteroids are composed mostly of rock and metal, remnants from the early Solar System.
Q107.At night, Plants intake ____ and release ____?
Correct Answer: A
At night, without sunlight for photosynthesis, plants take in oxygen and release carbon dioxide through respiration.
Q108.Basic metals can be converted into gold by ?
Correct Answer: C
Base metals can theoretically be converted into gold through artificial nuclear transmutation (radioactivity), not ordinary chemical means.
Q109.Brass gets discoloured in air because of the presence of which of the following gases in air ____ ?
Correct Answer: D
Brass discolors in air mainly due to the presence of hydrogen sulphide gas, which reacts with copper in the alloy to form a dark tarnish.
Q110.Bronze medal is made up of metals ?
Correct Answer: B
The classic bronze medal alloy consists mainly of copper and tin (bronze).
Q111.Carbon dioxide was discovered by____?
Correct Answer: C
Carbon dioxide was discovered by Scottish chemist Joseph Black in 1754.
Q112.Charge carriers in a metal are electrons rather than protons because electrons are?
Correct Answer: C
Electrons carry charge through a metal because they are loosely bound to their atoms. These mobile outer electrons can move through the metal lattice when an electric field is applied.
Q113.Chemical Name of Dry Ice?
Correct Answer: A
Chemical Name of Dry Ice: Solid Carbon Dioxide. Its composition and chemical or physical behavior give it the stated classification or property.
Q114.Chemical name of vinegar is ____?
Correct Answer: B
Chemical name of vinegar is Dilute acetic acid. Its composition and chemical or physical behavior give it the stated classification or property.
Q115.Chlorophyll contains ____metal.
Correct Answer: C
Chlorophyll contains magnesium. A magnesium ion sits at the center of its ring structure and helps the molecule absorb light for photosynthesis.
Q116.Color of the glow produced in the discharge tube:
Correct Answer: C
The glow in a discharge tube depends on the gas inside it. Excited atoms of each gas emit characteristic wavelengths as their electrons return to lower energy levels.
Q117.Copper can be converted into gold by ?
Correct Answer: A
Copper can be converted into gold by: Artificial radioactivity. This description follows from the defining characteristics and established facts associated with the subject.
Q118.Diamond is composed of a single element ____?
Correct Answer: A
Diamond is composed of a single element Carbon. Its composition and chemical or physical behavior give it the stated classification or property.
Q119.Diamonds are made up almost entirely of what element?
Correct Answer: A
Diamonds are made up almost entirely of what element: Carbon. Its composition and chemical or physical behavior give it the stated classification or property.
Q120.During winter in cold countries, the ____ is mixed to melt the ice on the icy roads.
Correct Answer: A
During winter in cold countries, the Salt is mixed to melt the ice on the icy roads. This description follows from the defining characteristics and established facts associated with the subject.