Study HubHubPage 18/114Scan verified MCQs with the answer highlighted, then open explanations when you want the reasoning.
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Temperature Measurement
Instrument used for measuring very high temperature is ________?
A pyrometer is an instrument specifically designed to measure very high temperatures, often in industrial settings, whereas a pyroscope is not a standard term for temperature measurement. Seismograph measures earthquakes, and xylometer is not related to temperature measurement.
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Sun / Astronomy
The sun’s atmosphere is divided into the following three parts:
The sun's atmosphere is commonly divided into three main layers: the photosphere, the chromosphere, and the corona. These are well-established terms in solar astronomy, making option C the correct choice.
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Atomic Structure
The maximum number of electrons that can be filled in the first shell of an atom is ______.
The first shell (K shell) of an atom can hold a maximum of 2 electrons because it contains only one s orbital, which can accommodate 2 electrons with opposite spins.
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Solar System / Planets
Which planets are called ice giants?
Uranus and Neptune are called ice giants because they have a higher composition of 'ices' such as water, ammonia, and methane, unlike Jupiter and Saturn which are gas giants primarily composed of hydrogen and helium.
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Human Respiratory System
Each day, the human body breathes in ________ liters of air.
The average human breathes in about 15,000 to 20,000 liters of air per day, considering an average respiratory rate and tidal volume. This makes option C the most accurate choice.
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Atomic Structure
Identify the monoatomic molecule among the following.
A monoatomic molecule consists of a single atom. Helium is a noble gas that exists naturally as single atoms, making it monoatomic. Ozone, hydrogen, and nitrogen are diatomic or triatomic molecules.
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Energy Conversion Devices
A device which converts chemical energy into electrical energy is called __________?
A battery converts chemical energy directly into electrical energy through electrochemical reactions, making it the correct answer. Motors convert electrical energy into mechanical energy, generators convert mechanical energy into electrical energy, and moving-coil meters measure current or voltage.
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Melting Ice
During winter in cold countries, the _________ is mixed to melt the ice on the icy roads.
Salt is commonly spread on icy roads during winter to lower the freezing point of water, causing ice to melt and making roads safer to drive on.
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Atmosphere
As one moves away from the surface of the Earth to higher altitudes, the atmospheric pressure will go on _______.
Atmospheric pressure decreases with increasing altitude because the density of air molecules becomes lower as you move higher away from Earth's surface.
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Solar System / Planets
Which four planets are also called the terrestrial planets?
The terrestrial planets are the four inner planets of the Solar System: Mercury, Venus, Earth, and Mars. They are characterized by their rocky surfaces, unlike the outer gas giants.