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#1
By Zain
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Medium
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Fact Checked
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23 Feb 2026
The greenhouse effect occurs because certain atmospheric gases are:
💡 Explanation:Greenhouse gases allow high-energy, short-wave solar radiation to reach Earth but trap low-energy, long-wave infrared radiation (heat) emitted from the surface.
#2
By Zain
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Medium
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Fact Checked
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14 Feb 2026
If voltage across a resistor is doubled and resistance is halved, what happens to the electric current?
💡 Explanation:According to Ohm's Law, I = V/R, where I is current, V is voltage, and R is resistance. If the voltage (V) is doubled (2V) and the resistance (R) is halved (R/2), the new current (I') is calculated as: I' = (2V) / (R/2) = 4(V/R) = 4I. Therefore, the current quadruples.
#3
By Zain
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Hard
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Fact Checked
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05 Feb 2026
Which phenomenon primarily enables light transmission in optical fibers?
💡 Explanation:Total Internal Reflection (TIR) is the core principle. It occurs when light, traveling through the fiber's core (higher refractive index), strikes the boundary with the cladding (lower refractive index) at an angle greater than the critical angle, causing the light to be entirely reflected back into the core. This confines the light and allows it to travel long distances with minimal loss.
#4
By Zain
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Medium
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Fact Checked
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19 Jan 2026
What is the primary function of ribosomes within a cell?
💡 Explanation:Ribosomes are essential cellular structures known as the 'protein factories' of the cell. Their primary function is to synthesize proteins through the process of translation, which uses the genetic information carried by mRNA.
#5
By The Quiz Wire
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Medium
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Fact Checked
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26 Dec 2025
How does exposure to only green light affect the rate of photosynthesis in plants?
💡 Explanation:Chlorophyll, the primary photosynthetic pigment, absorbs light most efficiently in the blue and red regions of the visible spectrum. Green light is largely reflected by chlorophyll, which means the energy available to drive photosynthesis is minimal, resulting in a very low rate. The process is not halted entirely because some minor absorption still occurs.
#6
By The Quiz Wire
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Hard
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Fact Checked
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19 Dec 2025
How many phases of water coexist in equilibrium at its triple point?
💡 Explanation:The triple point is a specific temperature and pressure at which the three phases (states) of a substance—solid, liquid, and gas—coexist in thermodynamic equilibrium. For water, this occurs at 0.01 °C and 611.73 Pascals (0.006037 atm).
#7
By The Quiz Wire
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Easy
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Fact Checked
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11 Dec 2025
Household electrical appliances are generally wired in which circuit configuration?
💡 Explanation:Household appliances are wired in a parallel connection. This configuration ensures that each appliance receives the full line voltage (usually 120V or 230V) and can be operated independently. In a series circuit, all appliances would share the voltage and if one fails, the entire circuit breaks.
#8
By The Quiz Wire
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Easy
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Fact Checked
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10 Dec 2025
Which property of water causes coastal regions to have moderate temperatures compared to inland areas?
💡 Explanation:Water's high specific heat capacity means it requires a large amount of heat energy to increase its temperature and releases a large amount of heat energy when cooling. Large bodies of water, like oceans, therefore heat up and cool down slowly, acting as a temperature buffer that moderates the climate of adjacent coastal regions, making them less extreme than inland areas.
#9
By The Quiz Wire
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Medium
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Fact Checked
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06 Dec 2025
What blood component primarily transports oxygen to the body’s tissues?
💡 Explanation:Red Blood Cells (Erythrocytes) contain the protein hemoglobin, which is responsible for binding and transporting oxygen from the lungs to the body's tissues. Plasma transports nutrients and waste, platelets aid in clotting, and white blood cells are part of the immune system.
#10
By The Quiz Wire
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Medium
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Fact Checked
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04 Dec 2025
To maximize the solubility of a gas in a liquid, what combination of pressure and temperature is most effective?
💡 Explanation:The solubility of a gas in a liquid is governed by pressure and temperature. According to Henry's Law, gas solubility is directly proportional to the partial pressure of the gas (high pressure increases solubility). Gas dissolution in liquid is generally an exothermic process, so according to Le Chatelier's principle, an increase in temperature decreases gas solubility (low temperature increases solubility). Therefore, the maximum solubility is achieved with high pressure and low temperature.
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