General Science Topics
Undergraduate level — General Science
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quiz Questions
Q131
An object experiences an absolute loss of weight when weighed inside an elevator falling freely due to a broken cable. What is the apparent weight of the object?
Equal to its true mass
Zero
Double its true weight
Dependent on air friction parameters
Explanation
During a free fall, the acceleration of the elevator equals the acceleration due to gravity (a = g). The apparent weight is N = m(g - a) = m(g - g) = 0, creating a state of weightlessness.
Q132
Which chemical element belongs to Group 18 of the periodic table and is widely used inside high-intensity runway beacon lights due to its ability to produce a bright white light?
Helium
Neon
Xenon
Argon
Explanation
Xenon is a noble gas (Group 18) that emits a brilliant, sun-like white light when an electric current passes through it, making it ideal for high-intensity strobe and runway lights.
Q133
Which structural type of RNA is predominantly responsible for carrying genetic codes from the nuclear DNA templates directly to the ribosomal translation sites?
Transfer RNA (tRNA)
Messenger RNA (mRNA)
Ribosomal RNA (rRNA)
Small nuclear RNA (snRNA)
Explanation
Messenger RNA (mRNA) acts as a structural transcript synthesized from genomic DNA that carries the specific base triplet codon sequences to ribosomes for protein assembly.
Q134
The computational memory standard known as 'SRAM' outperforms 'DRAM' structurally due to which characteristic factor?
It requires continuous magnetic alignment fields
It retains data without needing periodic electrical refresh cycles
It utilizes optical diffraction grates to route logical bit paths
It functions under sub-zero cryogenic insulation setups
Explanation
SRAM uses flip-flops to store bits and does not require periodic electrical refreshing cycles, making it significantly faster but more expensive and less dense than capacitor-based DRAM.
Q135
Which of the following descriptions accurately characterizes the ecological indicator role of Lichens inside an ecosystem suffering from industrial smog?
They act as robust consumers of complex soil heavy metal matrices
They disappear rapidly in response to high atmospheric sulphur dioxide levels
They accelerate the artificial synthesis of sub-surface ozone blocks
They undergo explosive multiplication during heavy acid rain events
Explanation
Lichens are highly sensitive bioindicators for air quality, especially sulphur dioxide (SO2) pollution. Their degradation or absolute absence signifies high airborne toxicity levels.
Q136
A parallel-plate capacitor has a capacitance C. If the distance between the two metallic plates is exactly doubled, what is the new capacitance?
2C
C / 2
4C
C / 4
Explanation
The capacitance of a parallel-plate capacitor is given by C = ε₀A/d. If the distance d is doubled (2d), the capacitance is halved (C' = C / 2).
Q137
Which fundamental chemical statement dictates that a pure chemical compound always contains its component elements combined in a fixed ratio by mass?
Law of Conservation of Mass
Law of Definite Proportions
Law of Multiple Proportions
Law of Reciprocal Proportions
Explanation
The Law of Definite Proportions (Proust's Law) states that a chemical compound always contains exactly the same proportion of elements by mass, regardless of its source or method of preparation.
Q138
The plant adaptation called 'Pneumatophores' observed across salt-marsh mangrove flora serves which specific physiological function?
To capture sub-surface mineral solutes aggressively
To absorb atmospheric oxygen for root respiration
To store heavy photosynthetic sugar concentrates winterwise
To anchor the plant securely against deep oceanic shelf currents
Explanation
Pneumatophores are specialized erect aerial roots that grow upwards out of the water and mud to absorb oxygen directly from the atmosphere for respiration in oxygen-deficient waterlogged soils.
Q139
An optical microscope uses monochromatic light of a specific wavelength. If the numerical aperture of the objective lens is increased, how does it structurally affect the resolving power of the microscope?
The resolving power decreases linearly
The resolving power increases
The resolving power remains completely unchanged
The focal length of the eyepiece collapses to zero
Explanation
The resolving power of a microscope is directly proportional to its numerical aperture (Resolving Power = 2NA / λ). Increasing the numerical aperture allows the lens to gather more light and resolve finer structural details, thereby increasing the resolving power.
Q140
Which of the following organic functional groups defines the chemical family of Esters and is responsible for the characteristic sweet fruity smell observed in synthetic flavorings?
-O- (Ether linkage)
-COO- (Ester linkage)
-COCl (Acid chloride group)
-NH2 (Amino group)
Explanation
Esters are functional derivatives of carboxylic acids having the general group linkage -COO-, where a carbonyl carbon is bonded to an alkoxy group (-OR). They are world-famous for their pleasant, fruity aromas.