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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.
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Q. 3658
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An alternating current instead of direct current is used in long-distance electric transmission because:
Correct option: C
- Why: For long-distance transmission, high voltage with lower current reduces I^2R losses. Since power P ≈ VI and losses ∝ I^2, increasing V lowers I for the same P, so losses are minimized.
- Key concept: Use of alternating current enables easy voltage transformation with transformers.
- Formula (brief): P_loss = I^2R; to keep P constant, increasing V lowers I, reducing losses.
- Why others are incorrect: A) Easy to generate is not the main reason; B) Rectification is unnecessary for transmission; D) AC itself does not inherently reduce accidents.
- Exam tip: Remember “high voltage, low current = lower losses” as the core idea for AC transmission.
Q. 3657
👁 2 views
Which one of the following solutions will not turn blue litmus to red litmus?
Correct answer: C. Sodium hydroxide
- Blue litmus turns red in acids, e.g., lemon juice, acetic acid, and hydrochloric acid. (Acids < 7 pH)
- Sodium hydroxide is a base; bases turn blue litmus blue and do not turn it red. (Bases > 7 pH)
- Key concept: litmus changes color with acidity/basicity; acids turn blue → red, bases keep blue.
- Exam tip: If a solution is strongly basic, blue litmus stays blue; if acidic, it turns red.
Q. 3656
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CNG stands for:
Explanation
- Correct answer: B. Compressed Natural Gas
- Key concept: CNG is natural gas (mainly methane) stored under high pressure to reduce volume for transport and use as fuel.
- Why correct: The term describes storing natural gas in compressed form, not gasoline, nitrogen, or neon.
- Exam tip: Remember "Natural Gas" + "Compressed" → CNG (not LPG or LNG).
- Why others are incorrect: A: not gasoline; C: nitrogen gas; D: neon gas.
Q. 3655
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The location of where an organism lives would be best described as its:
Explanation:
- Correct answer: B (habitat) – The habitat is the physical place where an organism lives, providing its immediate environmental conditions (food, water, shelter).
- Key concept: location-based environment; the organism’s address in nature.
- Why not other options?
- A (niche) refers to the role an organism plays in an ecosystem, not its location.
- C (range) is the geographic area where the species is found, larger than a single habitat.
- D (biome) is a major ecological area with similar climate and communities.
Q. 3650
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1 Gigabyte (GB) is equal to:
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Q. 3649
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What is the name of a technology that allows telephone calls to be made over computer networks like the internet?
- VoIP is the technology that converts voice into data packets and transmits them over computer networks like the Internet, enabling telephone calls over IP networks.
- Key concept: Voice over Internet Protocol uses packet switching to send real-time voice data.
- Formula/note: Voice data is digitized and segmented into packets for transmission; reassembled at the destination.
- Exam tip: Remember “VoIP = voice over IP” commonly used for internet-based calls.
- Why others are incorrect: GSM and CDMA are mobile cellular standards; Modem is a device for analog/digital connection, not a protocol for internet calls.
Q. 3648
👁 2 views
What is the full form of USB?
Question: What is the full form of USB?
- Correct option: C. Universal Serial Bus
- Explanation: USB is a standard for connecting peripherals using a serial data transfer protocol and common connectors. It allows plug-and-play and power delivery to devices.
- Key concept: Serial communication and standardized interfaces enable multiple devices to share a single bus.
- Note on options:
- A and D are not standard terms in computing.
- B suggests Unlimited Serial Bus, which is incorrect.
- Exam tip: Remember “Universal” + “Serial” + “Bus” for USB basics.
Q. 3647
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Every computer connected to the internet is identified by a unique four-part strings known as:
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Q. 3646
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A network of computers and other peripherals that is confined to a relatively small space is call:
Correct answer: A. Local Area Network
- Key concept: A LAN covers a small geographic area like a building or campus, connecting computers and peripherals.
- Why correct: The description “confined to a relatively small space” matches a LAN.
- Why others are incorrect: Wide Area Network (WAN) spans large areas; Global Network is not a standard term; Intranet is a private network inside an organization (could be LAN-sized but not the definition).
Q. 3645
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Which of the following retains the information when the power to the system is shut down?
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