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#1
By Kalsoom Tahir
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Medium
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Fact Checked
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01 Oct 2026
How is surface gravity affected if a planet’s radius is halved while its mass remains constant?
💡 Explanation:Surface gravity follows an inverse-square law with the radius (g = GM/r^2). If the radius is reduced to 1/2, the gravity increases by a factor of 2 squared, which is 4.
#2
By Rabia Anum
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Medium
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Fact Checked
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05 Jun 2026
Why are lightweight objects near a fast-moving train pulled toward it as it passes?
💡 Explanation:According to Bernoulli's principle, an increase in the speed of a fluid (air) occurs simultaneously with a decrease in static pressure. The high-speed air near the train creates a low-pressure zone, causing objects to be pushed toward the train by the higher surrounding atmospheric pressure.
#3
By Ahmed Akber
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Hard
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Fact Checked
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09 Apr 2026
In the photoelectric effect, if the frequency of incident radiation exceeds the threshold but intensity is constant, increasing frequency results in:
💡 Explanation:Based on Einstein's photoelectric equation, the maximum kinetic energy of emitted electrons depends linearly on the frequency of incident light. While intensity affects the quantity of electrons (current), frequency determines their individual energy.
#4
By Ahmed Akber
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Hard
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Fact Checked
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04 Mar 2026
Why does the temperature of a gas decrease when it undergoes sudden expansion in a perfectly insulated container?
💡 Explanation:In an adiabatic process (no heat exchange), the First Law of Thermodynamics states that the work done by the gas during expansion comes from its internal energy. As internal energy decreases, the temperature falls.
#5
By Kalsoom Tahir
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Medium
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Fact Checked
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23 Feb 2026
If a car rounds a curve at double its original speed, the centripetal force required to keep it on its path will:
💡 Explanation:The formula for centripetal force is F = mv^2 / r. Since force is proportional to the square of the velocity, doubling the speed (2v) results in 2 squared, which is 4 times the original force.
#6
By Rabia Anum
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Medium
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Fact Checked
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05 Feb 2026
Which condition pair is essential for Total Internal Reflection (TIR)?
💡 Explanation:Total Internal Reflection (TIR) is an optical phenomenon that requires two specific conditions: the light must travel from an optically denser medium to an optically rarer medium, and the angle of incidence must be greater than the critical angle.
#7
By Rabia Anum
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Hard
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Fact Checked
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24 Jan 2026
The square of a planet’s orbital period is proportional to which power of the semi-major axis of its orbit?
💡 Explanation:Kepler's Third Law of Planetary Motion states that the square of a planet's orbital period (T) is directly proportional to the cube (power of 3) of the semi-major axis (a) of its orbit. This is often written as T² ∝ a³.
#8
By Ahmed Akber
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Hard
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Fact Checked
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23 Jan 2026
The Second Law of Thermodynamics fundamentally limits the efficiency of which process?
💡 Explanation:The Second Law of Thermodynamics (specifically the Kelvin-Planck statement) states that it is impossible to construct a device that operates in a cycle and produces no effect other than the extraction of heat from a reservoir and the performance of an equivalent amount of work. This fundamentally limits the maximum possible efficiency (Carnot efficiency) for converting heat energy into mechanical work.
#9
By Rabia Anum
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Easy
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Fact Checked
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15 Jan 2026
A 10 Omega resistor carries a 5 A current. What is the circuit’s voltage?
💡 Explanation:According to Ohm's Law, the voltage (V) across a resistor is the product of the current (I) and the resistance (R). The formula is $V = I times R$. Therefore, $V = 5 text{ A} times 10 Omega = 50 text{ Volts}$.
#10
By Kalsoom Tahir
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Medium
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Fact Checked
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08 Jan 2026
An ambulance siren approaches then recedes. What change in sound frequency does a stationary listener detect?
💡 Explanation:The Doppler effect is the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source. When a source (the siren) approaches an observer, the perceived frequency is higher (increased pitch). When the source moves away, the perceived frequency is lower (decreased pitch).
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