Q1. Magnetism in materials is due to
किसी सामग्री में चुंबकत्व किसके कारण है
(a) electrons at rest/ इलेक्ट्रॉन की स्थिरता
(b) circular motion of electrons/ इलेक्ट्रॉन की घूर्नन गति
(c) protons at rest/ प्रोटॉन की स्थिरता
(d) all neutrons at rest/ सभी न्यूट्रॉन की स्थिरता
किसी सामग्री में चुंबकत्व किसके कारण है
(a) electrons at rest/ इलेक्ट्रॉन की स्थिरता
(b) circular motion of electrons/ इलेक्ट्रॉन की घूर्नन गति
(c) protons at rest/ प्रोटॉन की स्थिरता
(d) all neutrons at rest/ सभी न्यूट्रॉन की स्थिरता
Ans.(b)
Sol. Magnetism is seen whenever electrically charged particles are in motion—for example, from movement of electrons in an electric current, or in certain cases from the orbital motion of electrons around an atom's nucleus.
Sol. Magnetism is seen whenever electrically charged particles are in motion—for example, from movement of electrons in an electric current, or in certain cases from the orbital motion of electrons around an atom's nucleus.
Q2. The earth wire of a cable is connected to
एक केबल की अर्थ तार किससे जुडी होती है
(a) the outer metallic body of the appliance/ उपकरण के बाहरी धातु शरीर से
(b) the fuse of the appliance/ उपकरण के फ्यूज से
(c) the filament of the appliance/ उपकरण के फिलामेंट से
(d) short circuitry of the appliance/ उपकरण के शॉर्ट परिपथ से
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Ans.(b)
Sol. The earth wire of a cable is connected to the fuse of the appliance.
Sol. The earth wire of a cable is connected to the fuse of the appliance.
Q3. Tungsten is used for the manufacture of the filament of an electric bulb, because
टंगस्टन का उपयोग इलेक्ट्रिक बल्ब के फिलामेंट के निर्माण के लिए किया जाता है, क्योंकि
(a) it is a good conductor/ यह एक सुचालक है
(b) it is economical/ यह किफायती है
(c) it is malleable/ यह लचीला है
(d) it has a very high melting point/ उच्च गलनांक बिंदु है
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Ans.(d)
Sol. Pure tungsten has some amazing properties including the highest melting point (3695 K), lowest vapor pressure, and greatest tensile strength out of all the metals.Because of these properties it is the most commonly used material for light bulb filaments.
Sol. Pure tungsten has some amazing properties including the highest melting point (3695 K), lowest vapor pressure, and greatest tensile strength out of all the metals.Because of these properties it is the most commonly used material for light bulb filaments.
Q4. The device which converts AC to DC is
यंत्र जो AC को DC में परिवर्तित करता है?
(a) oscillator /ऑस्कीलेटर
(b) simplifier/सिम्पलीफायर
(c) rectifier/रेक्टीफायर
(d) None of these/इनमें से कोई नहीं
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Ans.(c)
Sol. A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. The process is known as rectification, since it "straightens" the direction of current.
Sol. A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. The process is known as rectification, since it "straightens" the direction of current.
Q5. Which of the following metals is used for the manufacture of heating elements provided in electric iron?
एलेक्ट्रिक आयरन में प्रदान किए गए हीटिंग तत्वों के निर्माण के लिए निम्नलिखित में से कौन सी धातुओं का उपयोग किया जाता है?
(a) Nickel/ निकेल
(b) Chromium/ क्रोमियम
(c) Nichrome/ निक्रोम
(d) Tungsten/ टंगस्टन
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Ans.(c)
Sol. Nichrome wire is an alloy made from nickel and chromium. It resists heat and oxidation and serves as a heating element in products such as toasters and hair dryers.
Sol. Nichrome wire is an alloy made from nickel and chromium. It resists heat and oxidation and serves as a heating element in products such as toasters and hair dryers.
Q6. Electrostatic precipitator is used to control the pollution of
इलेक्ट्रोस्टैटिक अवक्षेपक का इस्तेमाल _______ प्रदूषण को नियंत्रित करने के लिए किया जाता है?
(a) air/वायु
(b) water/जल
(c) noise/ ध्वनि
(d) thermal/ ऊष्मीय
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Ans.(a)
Sol. Originally designed for recovery of valuable industrial-process materials, electrostatic precipitators are used for air pollution control, particularly for removing particles from waste gases at industrial facilities and power-generating stations.
Sol. Originally designed for recovery of valuable industrial-process materials, electrostatic precipitators are used for air pollution control, particularly for removing particles from waste gases at industrial facilities and power-generating stations.
Q7. Tape recorder should not be kept near one of the following things
टेप रिकॉर्डर को निम्नलिखित में से किस के पास नहीं रखा जाना चाहिए?
(a) clock/घडी
(b) magnet/चुम्बक
(c) electrical switchboard/ इलेक्ट्रिक स्विच बोर्ड
(d) radio/ रेडियो
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Ans.(b)
Sol. Tape recorder should not be kept near magnet.
Sol. Tape recorder should not be kept near magnet.
Q8. Which of the following is a good conductor of heat but a bad conductor of electricity?
इनमें से कौन सा ऊष्मा का सुचालक है लेकिन बिजली का कुचालक है?
(a) Celluloid/ सेल्यूलाइड
(b) Rubber/ रबड़
(c) Asbestos/ अदह
(d) Mica/ अभ्रक
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Ans.(d)
Sol. Mica is a bad conductor of electricity (very good insulator), but it is a very good conductor of heat.
Sol. Mica is a bad conductor of electricity (very good insulator), but it is a very good conductor of heat.
Q9. A photostat machine works on
एक फोटोस्टैट मशीन किस सिद्धांत पर कार्य करती है?
(a) electromagnetic image making/ विद्युत चुम्बकीय छवि बनाने
(b) electrostatic image making/ इलेक्ट्रोस्टैटिक छवि बनाने
(c) magnetic image making / चुंबकीय छवि बनाने
(d) thermal image making / थर्मल छवि बनाने
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Ans.(b)
Sol. All Electrostatic Copiers work under the premise that a charge of electricity is place on an Image Drum which has the ability to retain the electric charge much like a capacitor holds its charge but with the ability to hold or release the charge depending on how much light and darkness is applied to the Image Drum. A photocopier (also known as a copies of documents and other visual images quickly and cheaply. Most current photocopiers use a technology called xergorahpy. A dry process using heat. Copiers can also use other technologies such as ink jet, but xerography is standard for office copying.
Sol. All Electrostatic Copiers work under the premise that a charge of electricity is place on an Image Drum which has the ability to retain the electric charge much like a capacitor holds its charge but with the ability to hold or release the charge depending on how much light and darkness is applied to the Image Drum. A photocopier (also known as a copies of documents and other visual images quickly and cheaply. Most current photocopiers use a technology called xergorahpy. A dry process using heat. Copiers can also use other technologies such as ink jet, but xerography is standard for office copying.
Q10. Lightning is caused due to
तड़ित किस के कारण होता है?
(a) electric power/ विद्युत शक्ति
(b) electric discharge/ बिजली का निर्वहन
(c) electric leak/ विद्युत रिसाव
(d) electric pressure/ बिजली का दबाव
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Ans.(b)
Sol. Often lightning occurs between clouds or inside a cloud. But the lightning we usually care about most is the lightning that goes from clouds to ground—because that's us! As the storm moves over the ground, the strong negative charge in the cloud attracts positive charges in the ground(Lightning is caused due to electric discharge).
Sol. Often lightning occurs between clouds or inside a cloud. But the lightning we usually care about most is the lightning that goes from clouds to ground—because that's us! As the storm moves over the ground, the strong negative charge in the cloud attracts positive charges in the ground(Lightning is caused due to electric discharge).
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