General Science/Everyday Science MCQs
Topic Notes: General Science/Everyday Science
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
51
Which device measures air pressure?
Answer:
Barometer
A barometer measures atmospheric pressure in millibars. Pressure changes indicate weather patterns. Low pressure often signals storms.
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52
Weather refers to:
Answer:
Day-to-day atmospheric conditions
Weather changes daily and includes temperature, humidity, and rain. Climate describes long-term averages. Meteorology studies both.
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53
What primarily causes wind?
Answer:
Temperature and pressure differences
Air moves from high-pressure to low-pressure zones. Heating of the surface creates differences in air density. Rotation modifies wind direction.
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54
The atmospheric layer closest to Earth is:
Answer:
Troposphere
The troposphere extends up to about 12 km. It contains weather systems and clouds. Human activity occurs here.
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55
Which gas dominates Earth’s atmosphere?
Answer:
Nitrogen
Nitrogen makes up about 78% of the atmosphere. It is relatively inert and stabilizes air composition. Oxygen is the second most abundant.
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56
What is humus?
Answer:
Organic component of soil
Humus forms from decayed plants and animals. It improves soil fertility and structure. It helps retain moisture and nutrients.
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### Atmosphere, Weather, and Climate
57
Clay particles are described as:
Answer:
Very fine and smooth
Clay particles are the smallest among soil types. They hold water but drain poorly. Clay-rich soil is heavy and sticky.
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58
The fertile top layer of soil is called:
Answer:
Topsoil
Topsoil is rich in nutrients and organic matter. It supports crops and vegetation. Soil erosion reduces its depth and fertility.
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59
Marble is formed from which parent rock?
Answer:
Limestone
Marble is a metamorphic rock. Heat and pressure recrystallize limestone into marble. It is widely used in art and construction.
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60
Which mineral is used in glass making?
Answer:
Quartz
Quartz, composed of silica, is melted to form glass. Its purity affects glass quality. It is one of Earth’s most common minerals.
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