General Science Topics
Undergraduate level — General Science
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quiz Questions
Q211
An object of mass 4 kg moves with a kinetic energy of 200 Joules. What is the magnitude of its linear momentum?
20 kg·m/s
40 kg·m/s
80 kg·m/s
160 kg·m/s
Explanation
The relationship between kinetic energy (KE) and linear momentum (p) is given by the equation KE = p² / (2m). Rearranging for momentum gives p = √(2 * m * KE). Substituting the values: p = √(2 * 4 * 200) = √1600 = 40 kg·m/s.
Q212
Which of the following processes is a chemical reaction that releases thermal energy into the surrounding environment, classifying it as an exothermic change?
Evaporation of water molecules
Slaking of quicklime with water
Sublimation of Ammonium Chloride
Dissolution of Glucose crystals
Explanation
The slaking of lime (reaction of quicklime, Calcium Oxide, with water) is a highly exothermic chemical reaction. It releases a massive amount of heat energy, producing Calcium Hydroxide.
Q213
Which specific muscular tissue inside the human body is structurally characterized by involuntary control, non-striated spindle-shaped layouts, and single nuclear cores?
Skeletal Muscle
Smooth Muscle
Cardiac Muscle
Striated Multi-nuclear Muscle
Explanation
Smooth muscle fibers are non-striated, involuntary, and spindle-shaped with a single central nucleus. They form the structural layer of internal visceral organs like the stomach, intestines, and blood vessels.
Q214
What is the primary technological objective of using 'Moderators' like heavy water or graphite inside a nuclear power plant reactor core?
To capture and absorb excess thermal neutrons completely
To slow down fast neutrons to sustain the chain reaction
To chemically neutralize radioactive gaseous isotopes
To accelerate the radioactive beta emission decay cycles
Explanation
A nuclear moderator slows down the high-velocity fast neutrons produced during fission. Slowing them down converts them into thermal neutrons, which have a significantly higher probability of inducing further fission chains in Uranium-235.
Q215
The localized microclimate variance strategy known as 'Albedo Effect' describes how an ecosystem's surface properties modify climate via which mechanism?
The chemical fixation rate of heavy industrial smog particles
The solar radiation reflectivity parameter of the surface
The adiabatic pressure head drop across urban mountain boundaries
The volume of moisture trapped inside sub-surface root nets
Explanation
Albedo is the measure of the reflectivity of a surface. Surfaces with high albedo (like snow or ice) reflect most solar radiation back into space, cooling the local habitat, while low albedo surfaces (like forests or oceans) absorb it, raising temperatures.
Q216
An electric iron has a resistance of 44 Ohms and is connected across a standard 220 V voltage line. What is the current flowing through this heating appliance?
2 Amperes
5 Amperes
10 Amperes
0.2 Amperes
Explanation
According to Ohm's Law, V = I * R. Rearranging for current gives I = V / R. Substituting the given values: I = 220 V / 44 Ohms = 5 Amperes.
Q217
Which chemical formulation is commonly known as 'Plaster of Paris' and undergoes a hardening process when blended with water?
CaSO4·2H2O
CaSO4·½H2O
CuSO4·5H2O
Na2CO3·10H2O
Explanation
Plaster of Paris is Calcium Sulphate Hemihydrate, chemically written as CaSO4·½H2O. When mixed with water, it rehydrates to form a hard solid mass of gypsum (CaSO4·2H2O).
Q218
Which specific structure inside plant cells acts as the non-living protective outermost border framework, missing completely from animal cellular biology layouts?
Plasma Membrane
Cell Wall
Nuclear Envelope barrier
Tonoplast sheet
Explanation
The Cell Wall is a rigid, non-living outer layer composed mainly of cellulose that covers the plasma membrane of plant cells, providing structural support and protection. It is entirely absent in animal cells.
Q219
An ultrasonic waves transmitter drops an acoustic signal down from a survey ship into a deep ocean block. If the sensor tracks the return echo exactly 6 seconds later and sound speed parameters inside seawater are 1500 m/s, what is the depth of the ocean floor?
3000 meters
4500 meters
9000 meters
2250 meters
Explanation
The total time for the echo round trip is 6 seconds. The time taken to reach the seabed is half of this value, t = 6 / 2 = 3 seconds. Using the distance formula: Depth = speed × time = 1500 m/s × 3 s = 4500 meters.
Q220
Which of the following elements has the lowest first ionization energy value in its group, allowing it to easily release valence electrons for photo-electric applications?
Lithium
Sodium
Cesium
Potassium
Explanation
Cesium (Cs) has a large atomic radius and its outermost valence electron is loosely bound to the nucleus, giving it an extremely low ionization energy that is ideal for atomic clocks and photoelectric cells.