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This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The graph of current I (on y-axis) Vs. potential difference V (on x-axis) is found to be a straight line. The slope of the straight line gives A voltage B resistance C reciporcal of resistance D current |
| Answer» RESISTANCE. OPTION b is the right answer..for BETTER answers please follow meplease mark as BRAINLIEST | |
| 2. |
What is the time period of visible light for which human eye is most sensitive? |
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Answer» Under daylight conditions, the average normal sighted HUMAN eye is most SENSITIVE at a WAVELENGTH of 555 nm, resulting in the fact that green light at this wavelength produces the impression of highest "brightness" when COMPARED to light at other wavelengths. |
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| 3. |
Let the wavelengths of the electromagnetic waves used quite often for (i) killing germs in household water purifiers, (ii) remote sensing (iii) treatment of cancer, be labelled as λ1, λ2 and λ3 in increasing order. [CBSE Sample Paper 2011] |
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Answer» i)killing germs in HOUSEHOLD WATER PURIFIER,plz MARK as brainleast |
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| 4. |
Name em radiations used for detecting fake currency notes. |
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Answer» olet wavesUltraviolet waves or UV rays are used for detecting fake and forged CURRENCY. The PAPER currency has a STRIP that is embedded in the note. This strip cannot be forged like that in the ORIGINAL currency. So, to CHECK for detecting forgery in currency notes, UV rays are used.mark as brillienst answer |
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| 5. |
Which of the following, if any, can act as a source of electromagnetic waves? (i) A charge moving with a constant velocity. (ii) A charge moving in a circular orbit. (iii) A charge at rest. [DoE] |
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Answer» A charg moving in a CONSTANT VELOCITY MARK as brillienst ANSWER |
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| 6. |
The velocity of propagation (in vacuum) and the frequency of (i) X-rays and (ii) radiowaves are denoted by (vx, nx) and (vR, nR) respectively. How do the values of (a) vx and vR (b) nx and nR, compare with each other? |
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| 7. |
Is the ratio of frequencies of ultraviolet rays and infrared rays in glass more than, less than or equal to 1? |
| Answer» FREQUENCY won't CHANGE if the light rays travel through different media. Now, frequency of UV rays are HIGHER than infrared rays. So ratio of frequencies of ULTRAVIOLET and infrared rays is always greater than 1. In glass or vacuum or AIR, it's always greater than 1mark as brillienst answer | |
| 8. |
The relative electric permittivity of a medium is 9 and the relative permeability is close to unity. What is the speed of em waves in the medium? |
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Answer» tion:The SPEED of light in the medium, V= μ r ϵ r c =0.5× (4)(9) 3×10 8 m/s =10 8 m/sHence, the magnitude of electric FIELD =vB=0.5×10 8 m/s×4.2×10 −8 T =2.1Vm −1 |
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| 9. |
Write the expression for speed of electromagnetic waves in a medium of electrical permittivity e and magnetic permeability μ. [Foreign 2017] |
| Answer» C= 1/√μ∈please MARK it as BRAINLIEST | |
| 10. |
Arrange the following electromagnetic waves in order of increasing frequency: γ-rays, microwaves, infrared rays and ultraviolet rays. [Foreign 2014] |
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Answer» कच्ची कच्ची उम्र में एक बार तो यह भी नहीं जानते हैं और न ही मिले और हम |
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| 11. |
In which directions do the electric and magnetic field vectors oscillate in an electromagnetic wave propagating along the x-axis? [AI 2017] |
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Answer» Light and other ELECTROMAGNETIC waves are TRANSVERSE waves made up of mutually perpendicular, fluctuating ELECTRIC and magnetic fields. In the diagram on the right an EM WAVE is propagating in the x-direction, the electric field oscillates in the xy-plane, and the magnetic field oscillates in the xz-plane. |
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| 12. |
For which frequency of light, the human eye is most sensitive? |
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Answer» Under daylight CONDITIONS, the average normal sighted human eye is most sensitive at a wavelength of 555 nm, RESULTING in the FACT that GREEN light at this wavelength produces the impression of highest "brightness" when COMPARED to light at other wavelengths. |
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| 13. |
What oscillates in electromagnetic waves? Are these waves transverse or longitudinal? [CBSE Sample Paper 2011] |
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Answer» An ELECTROMAGNETIC wave is a wave RADIATED by an accelerated charge and which propagates through space as coupled electric and MAGNETIC FIELDS, oscillating perpendicular to each other and to the direction of propagation of the wave. Electromagnetic waves are transverse in NATURE. |
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| 14. |
Convert 2 microfarda into farda |
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Answer» 0.000002 FARADAExplanation:1 μF (MICROFARAD, one MILLIONTH (10−6) of a farad) PLS MARK BRAINLIEST |
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| 15. |
Find electric field at point Pplease helpIf you know the method then give the method only |
| Answer» SORRY I didn't GET the answersExplanation:sorry PLEASEMARK it as BRAINLEST ANSWER | |
| 17. |
How to find current thru a particular resistor in A circuit |
| Answer» CURRENT can FIND by a AMMETER............ | |
| 18. |
Name the SI unit of power. Define the same. |
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Answer» The rate of doing work is CALLED as power.Units of power can be DEFINED as the work done per UNIT time. THUS the SI unit of power is joule per second. Power can also be expressed as the multiplication of the force used to move the OBJECT in the direction of force with a considerable speed. |
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| 19. |
Vartman samay me jansanchar k lokpriya adhunik madhyam ki suchi aur byora dijiye? |
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Answer» समय में जनसंचार के लोकप्रिय आधुनिक माध्यम ये हैं-' दूरदर्शन, समाचार पत्र, फिल्में, पत्रिकाएं, रेडियो, विज्ञापन, वीडियो गेम और सीडी।'1- पहला आधुनिक मास मीडिया संस्थान 'प्रिंटिंग प्रेस डेवलपमेंट' के साथ शुरू हुआ।2- आज के जीवन में, हमारे पास आधुनिक जनसंचार के स्रोत के रूप में 'अखबार, पत्रिका, रेडियो, टेलीविजन, इंटरनेट, विज्ञापन, सोशल मीडिया, पत्रकारिता' हैं।3- चूंकि 'सोशल मीडिया' इन दिनों युवाओं के बीच बहुत आम है, यह मोबाइल डिवाइस और होम कंप्यूटर दोनों पर उपयोग किए जाने वाले प्लेटफ़ॉर्म हैं, जो उपयोगकर्ताओं को 'शब्दों, ध्वनियों, छवियों और वीडियो के उपयोग' के माध्यम से बातचीत करने की अनुमति देता है। सोशल मीडिया में 'इंस्टाग्राम, फेसबुक और लिंक्डइन' आदि जैसी लोकप्रिय साइटें शामिल हैं।4- 'रेडियो' को दुनिया में आधुनिक जन संचार के व्यापक रूप में सुलभ रूप में माना जाता है।5- 'ई-बुक्स' आधुनिक जनसंचार माध्यम का रूप है जिसमें कम्प्यूटेशनल उपकरणों या फोन पर इसे पढ़ने के लिए पाठ प्रस्तुति शामिल है। ई-बुक्स से हमें किताबें डाउनलोड करने में आसानी होती है। लोग अपने उपकरणों पर पुस्तकों को डाउनलोड करने में सक्षम हैं और आसानी से ट्रैक कर सकते हैं कि हम क्या पढ़ते हैं और केवल उस पर क्लिक करके इंटरनेट पर शब्दों की परिभाषाएं जान सकते हैं।6- 'समाचार पत्र' मुद्रित तह शीट हैं जो दुनिया में वर्तमान घटनाओं के समाचार और विज्ञापन प्रदान करते हैं।#BrainlyCelb ✔️ |
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| 21. |
Why can't we change the potential difference created by a cell FAST FAST FAST |
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Answer» tion:The cell POTENTIAL, ECELL, is the MEASURE of the potential difference between two half cells in an electrochemical cell. The potential difference is CAUSED by the ABILITY of electrons to flow from one half cell to the other. |
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| 22. |
W PolosdondDoetingMYSe vonDBwe)alealhealeSotolAsertion iconood on salonRooned olen las) Both Sition and oncon |
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Answer» WHATExplanation: |
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| 23. |
Work done by the electric force on unit positive charge to move it through a distance is called ………………. 1 point A) Resistance B) voltage C) current D) conductivity |
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Answer» CURRENTExplanation: |
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| 24. |
An object is placed at a distance of 12 cm from the convex mirror of focal length 20 cm. What is the distance between the object and the image formed by the mirror |
| Answer» PLEASE MARKET BRANLIST answersExplanation:so IMAGE from was 7.5cm | |
| 25. |
What is the pressure in pascal at a depth of 1m below the water surface |
| Answer» E = DGH= 1000×9.8×1=9800 PA | |
| 26. |
The magnetic field at the centre of the circular coil carrying current of 4 A |
| Answer» | |
| 27. |
Doffrentiate between scalar and vector quantity |
| Answer» NCE Between Scalar and Vector. A scalar QUANTITY is different from a vector quantity in terms of direction. Scalars don't have direction whereas vector has. Due to this, the scalar quantity can be SAID to be REPRESENTED in one dimensional whereas a vector quantity can be multi-dimensional. | |
| 28. |
How can you say that spherical mirrors are useful? |
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Answer» d, here your answer isFollowing are the IMPORTANT uses of spherical MIRRORS: The concave mirrors are commonly USED as shaving mirrors because when we see our FACE in the concave mirror then an enlarged and erect image is formed which helps in smooth shaving. |
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| 29. |
How are X-rays produced? [AI 2011] |
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Answer» o I am very sorry to be either side with the same number you can do in my family and I have a very nice feeling that has been a SHOPKEEPER and I have been trying I don't know l am not understand your question not SOLVE PLEASE so sorry OK |
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| 30. |
Write two uses of infrared rays. [Foreign 2011] |
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Answer» so please let us know what you like the best answer please don't let me GO far back and the WORLD and the demons are not understand what are 56inches Explanation:I don't know L 3rd ST. at the door but he's not the |
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| 31. |
Name the electromagnetic radiations used for (a) water purification, and (b) eye surgery. [CBSE 2018] |
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| 32. |
How are radio waves produced? [AI 2011] |
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Answer» A RADIO WAVE is GENERATED by a transmitter and then DETECTED by a receiver. |
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| 33. |
If density of oak wood is 0.64 the what is its density in cgs system |
| Answer» E density = (density of the substance/ density of water)—————————1Note - Care should be taken that the density of both are in same units.As we know thatDensity of water is 1 GM/cm^3Now,LET the density of Oak wood be x.And according to question,Relative density = 0.64from equation 1.Density of oak/ density of water = 0.64x/density of water = 0.64x/1 gm cm^-3 = 0.64So x = 0.64 gm/cm^3And we know that :Density(in cgs)* 1000 = density (in SI)So, 0.64 gm/cm^3 = 640 kg/m^3Hope this will help.Please hit this the brainliest ANSWER .... | |
| 34. |
Name the part of electromagnetic spectrum whose wavelength lies in the range of 10-10 m. Give its one use. |
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Answer» X‐ray REGION Uses: Airport security luggage SCANNERS USE X‐rays for INSPECTING the interior of luggage for security threats before loading on aircraft. |
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| 35. |
Welders wear special goggles or face masks with glass windows to protect their eyes from electromagnetic radiations. Name the radiations and write the range of their frequency. [AI 2013] |
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Answer» ans..is here DUDE hope it HELPS u.Explanation:welders were special goggles or face MASKS with glass WINDOWS to protect their eyes from uv rays. Frequency range of uv rays is 7.5×1014 to 5×1017 hz (800Thz to 30Phz)..dude plz mark as BRAINLIEST. |
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| 36. |
What is the frequency of electromagnetic waves produced by oscillating charge of frequency v? [Delhi 2011C] |
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Answer» Answer: Electromagnetic WAVES are produced by the oscillation of a charged PARTICLE. If the particle is oscillating at a frequency F then the frequency of the electromagnetic waves will ALSO be f. |
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| 37. |
Write two uses of X-rays. [Foreign 2011] |
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Answer» ️♥️♥️♥️♥️♦️♦️♦️♦️♦️♦️♦️♥️♥️♥️♥️♦️♦️♦️♦️♥️♥️♦️♦️♦️⭐☀️☀️☀️☁️⛅⛅⛈⛈☔☔⛱❄☃️☃️⛄☄⏲⌛⛽♥️♥️♦️♦️♥️♥️♦️♥️♥️♦️♥️hello also have the ABILITY to the RIGHT to make a DECISION on my p and the other SIDE and COMMUNICATION |
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| 38. |
Name the electromagnetic waves, which (i) maintain the Earth’s warmth, and (ii) are used in aircraft navigation. [Foreign 2012] |
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Answer» (i) INFRARED rays maintain the earth's warmth. (ii) MICROWAVES are used in aircraft navigation due to their short wavelength. |
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| 39. |
A capacitor has been charged by a dc source. What are the magnitudes of conduction and displacement currents, when it is fully charged? [Delhi 2013] |
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Answer» A CAPACITOR has been charged by a DC source. What are the MAGNITUDE of CONDUCTION and displacement current, when it is fully charged? When the capacitor is fully charged, no current will pass through the capacitor. ... The VALUE of conduction current= displacement current=0. |
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| 40. |
How are microwaves produced? [AI 2011] |
| Answer» MICROWAVES are produced by vacuum TUBES devices that operate on the ballistic motion of electron controlled by magnetic or electric fields. Some different kinds of microwave emitters are the CAVITY magnetron, the KLYSTRON, the traveling-wave tube(TWT), the gyrotron and all stars. | |
| 41. |
Total resistance of the given diagram |
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Answer» RExplanation:it is WHEATSTONE BRIDGE |
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| 42. |
3. What is the minimum resistance which can be made using five resistors each 1/5 ohm?(a) 1/5 ohm(b) 1/25 ohm (c) 1/10 ohm (d) 25 ohm |
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Answer» tion:CONNECT all in a parallel combination THUS the resistance WOULD be1/Req= (5+5+5+5+5) ohms = 25 ohmsthus Req = 1/25 ohms |
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| 43. |
Energy released during nuclear reaction is due to the conversion of |
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Answer» Explanation: Nuclear fusion produces energy by COMBINING the very lightest ELEMENTS into more tightly bound elements (such as hydrogen into helium), and nuclear fission produces energy by splitting the heaviest elements (such as URANIUM and plutonium) into more tightly bound elements (such as barium and krypton). |
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| 44. |
Show that the resultant resistance is equal to the sum of all the individual resistances |
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Answer» ...................................................... |
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| 45. |
What is inertia? give example for each type. |
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Answer» Inertia is a word we USE when we talk about matter and movement. Basically, our idea of inertia goes back to SIR Issac Newton's first TWO laws of physics:1. An object at rest tends to stay at rest.2. An object in motion tends to stay in motion. |
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| 46. |
Diffence between true value and measured value is |
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Answer» tion:Measurement value and TRUE valueThe measurement value (which is SOMETIMES REFERRED to simply as the measurement) is the value given by a MEASURING instrument and the true value is the actual value of the property being measured. |
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| 47. |
Any 10 types of solid liquid and gas |
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Answer» ENPENCIL.COMBMOBILETVCOPYBOOKERASERPAPER 10.REMOTE ETC..LIQID-WatermilkcurdjuicecolddrinkH²OVinesbearPepsiurine. etc...GAS-oxygencarboncarbon dioxidenitrogenphosphorusmetheneozonfogairidk...i HOPE it HELPS U ... PLS mark me as BRAINLIST |
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| 48. |
To which part of the electromagnetic spectrum does a wave of frequency 5 × 1019 Hz belong? [AI 2014] |
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Answer» hello DOST KYA KAR RAHE Explanation:so sorry I don't know l am not UNDERSTAND your question not solve please so sorry |
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| 49. |
Ampere-Maxwell’s law states that line integral of magnetic field along the boundary of a closed path is equal to ________ . |
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Answer» The line integral of the electric field around a closed loop is equal to the NEGATIVE of the RATE of CHANGE of the MAGNETIC flux through the area enclosed by the loop. |
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