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General Science MCQ Practice
Practice General Science questions with instant scoring, correct answer highlighting, detailed solutions and first-click AI explanation caching for missing explanations.
📚 Questions: 553
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Q. 949
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Which of the following is used to express the speed of internet connectivity ?
Correct answer: A
- Explanation: Internet speed is a data rate measured in megabits per second. Mb / sec denotes megabits per second (Mbps).
- Key concept: Data rate units differentiate bits vs bytes; 1 Mbps = 10^6 bits per second.
- Why others are incorrect: - B (Mb) lacks per-second part, so unclear as speed. - C (Herz) measures frequency, not speed. - D (Kb) is kilobits (not per second) and usually too small.
- Exam tip: Remember Mbps for speed; use MBps when referring to megabytes per second.
Q. 948
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A transformer is used to :
Correct answer: B
- Reason: A transformer changes the amplitude of alternating current (AC) voltage using mutual induction. The ratio of voltages is V1/V2 = N1/N2 (turns on primary/secondary).
- Key concept: Faraday’s law of electromagnetic induction and transformer action require AC to continually vary flux.
- Why others are incorrect: - A: DC voltage cannot be transformed without conversion. - C: DC to DC conversion uses rectifiers/ DC-DC converters. - D: DC to AC requires an inverter.
- Exam tip: Remember: transformers only work with AC; no transformer converts DC directly.
Q. 945
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Where is 'Dakshin Gangotri' located ?
First scientific base station of India situated in Antarctica to carry out scientific works.
Q. 883
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'ASTROSAT' is a satellite launched by ISRO for :
Correct option: C
- Why correct: Astrosat is ISRO’s multi-wavelength space observatory designed for astronomy and astrophysics experiments, studying celestial objects across UV, X-ray, and other bands.
- Key concept: Space-based astronomical observations avoid atmospheric distortion; multi-wavelength data reveal different physical processes.
- If any formula: No complex formula needed; concept is electromagnetic spectrum observation.
Q. 805
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The element common to all acids is :
- Correct answer: Hydrogen — In acids, hydrogen is the element donated as H+ (Arrhenius) or as a proton (Brønsted–Lowry).
- Key concept: Proton donor behavior defines acids.
- Why others are incorrect: Oxygen, Nitrogen, and Sulphur are not universal to all acids.
- Exam tip: Remember that the defining feature of acids is presence or donation of hydrogen.
Q. 804
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Which of the following processes is responsible for transforming liquid into vapour ?
Answer: Evaporation (Option B)
- Concept: Vaporization of a liquid to a gas at the surface due to energy input (heat) without boiling.
- Why correct: Evaporation converts liquid molecules to vapor at temperatures below the boiling point, through surface-escape of high-energy molecules.
- Other options:
- Condensation: gas to liquid.
- Transpiration: water loss from plants, not a phase change of a pure liquid.
- Sublimation: solid to gas.
Q. 803
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The intensity of earthquake is measured by :
Answer: D. Seismograph
- Reason: A seismograph records ground vibrations during an earthquake, producing a seismogram that helps determine the quake’s intensity and magnitude.
- Key concept: Ground motion is captured by sensors; the amplitude and duration on the seismogram are used to assess intensity.
- Formula/note: Magnitude relates to amplitude of waves; larger amplitudes on the seismogram indicate stronger earthquakes.
- Why others are incorrect: Barometer measures pressure, hydrometer moisture/relative humidity, polygraph records physiological signals—not seismic activity.
- Exam tip: Remember: seismograph = records earthquakes; Mercalli/Richter relate to intensity/magnitude, respectively.
Q. 802
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Chemical name of 'Baking powder' is :
Answer: C. Sodium bi-carbonate
- Key concept: Baking powder releases CO2 when heated/with moisture; its active component is sodium bicarbonate (NaHCO3).
- Why correct: Sodium bi-carbonate neutralizes acids to produce carbon dioxide for leavening.
- Formula: NaHCO3.
- Why others are incorrect: A) Ammonium chloride is a separate salt used in some systems, not baking powder. B) Magnesium phosphate is irrelevant here. D) Ammonium bi-phosphate is another acid salt, not the base in baking powder.
- Exam tip: If a question asks for baking soda name, choose sodium bicarbonate; baking powder is a mixture containing it.
Q. 801
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Which of the following gases constitutes the major portion of the atmosphere by volume ?
Correct option: C Nitrogen
- Why: Atmospheric air is mainly nitrogen, about 78% by volume, making it the major component.
- Key concept: Volume percentage (concentration) in a gas mixture.
- Other options: Oxygen ~21%, Argon ~0.93%, CO2 ~0.04%—much smaller fractions.
- Exam tip: Remember “N2 ~ 78%” is the highest, then O2 ~21% as the second most abundant.
Q. 764
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How much time the light from Sun takes to reach the Earth ?
8 minutes and 20 seconds
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