Study HubHubPage 79/114Scan verified MCQs with the answer highlighted, then open explanations when you want the reasoning.
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Human Physiology
A man can survive without food for at least how long?
A human can generally survive without food for about one month, depending on hydration and health conditions. Survival beyond this period without food is rare and typically not sustainable.
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Solvents In Everyday Life
Nail polish remover contains ___________
Nail polish remover commonly contains acetone, which is an effective solvent for dissolving nail polish. The other options are not typically used in nail polish removers due to toxicity or ineffectiveness.
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Atomic Theory
Who proposed the first atomic theory?
John Dalton is credited with proposing the first modern atomic theory in the early 19th century, which described atoms as indivisible particles that make up matter. The other scientists contributed to atomic and molecular theory later, but Dalton's theory was the first comprehensive atomic model.
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Solar Energy
The large plates of solar panels are painted which color?
Solar panels are typically painted or coated black because black surfaces absorb more sunlight, which improves the efficiency of converting solar energy into electricity.
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Electricity Units
According to the definition of 1 kWh, a 100 watt bulb consumes one unit of electricity in_________.
A 100 watt bulb consumes 100 watts per hour. To consume 1 kilowatt-hour (1000 watt-hours), it takes 1000/100 = 10 hours. Hence, the bulb consumes one unit of electricity in 10 hours.
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Electricity Consumption
Units of electricity consumed by a 2500 watt air-conditioner in one hour are_________.
The unit of electricity consumed is calculated as power (in kilowatts) multiplied by time (in hours). A 2500 watt (2.5 kW) air-conditioner running for one hour consumes 2.5 units of electricity.
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Human Body
Chemically, fingernails are made up of __________?
Fingernails are primarily composed of keratin, which is a type of protein. Therefore, the correct answer is protein.
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Properties Of Metals
Which one of the following is the softest metal?
Among the metals listed—sodium, lithium, aluminium, and iron—sodium is the softest. Sodium has a Mohs hardness of about 0.5, which is slightly lower (softer) than lithium's hardness of about 0.6. Aluminium and iron are much harder metals with Mohs hardness values around 2.75 and 4 respectively. Therefore, sodium is the softest metal among the given options.
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Air Conditioning
Air Conditioning Controls: ___________
Air conditioning controls regulate multiple factors including the circulation of air, humidity, and temperature to maintain a comfortable indoor environment. Therefore, 'All of The Above' is the correct answer.
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Planets
Which planet is called the Great Red Spot?
The Great Red Spot is a giant storm on Jupiter, making Jupiter the planet associated with the Great Red Spot.