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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. |
Hey Guys .........♀ Is light a particle or a wave?Caution⚠ Attempt only when you're knowing✔@abhinavnayan#followme ✖✖✖✖✖✖✖✖✖✖✖✖✖✖✖ |
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Answer» y GOOD evening Here is your answer Well ⛯ light is not a PARTICAL, it's a TRANSVERSE electromagnetic wave BUDDY. Hope it help you Please mark me please #sibi |
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| 2. |
Which lens has a greater focal length when the optical prescription of a pair of spectacle is Right eye : - 3.5 D Left eye : - 4.00 D? |
| Answer» CONVEX LENS has GREATER FOCAL LENGTH | |
| 3. |
Find the nature, position and magnification of the image formed by a convex lens of focal length 10cm, If the object is placed at a distance of a) 15cm b) 8cm |
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Answer» the NATURE is REAL INVERTED and DIMINISHED |
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| 4. |
A boy weight 30 kg on Earth find his mass and weight on the surface of the Moon |
| Answer» WEIGHT of boy on earth (We)=30kgweight of boy on moon (Wm)=?we KNOW that -Wm=1/6×weight of object on earth =1/6×30kg =5Ntherefore, the weight of boy on moon is 5N. | |
| 5. |
Position of a particle is given as x = 2t3 - 12t2 + 2, find the acceleration when particle is at rest |
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| 6. |
Why plastic gets charged with hair |
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Answer» if U move plastic in AIR the interchange position of electron is CALLED CHARGE in |
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| 7. |
If perpendicular force increase 2 times then what is the coefficient of friction |
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Answer» No EFFECT on coefficient of friction Explanation:Because coefficient of friction is the NATURE of SURFACE. It doesn't DEPEND on applied force, mass of body, normal reaction etc. |
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| 8. |
If the far point of a myopic person is 75 cm, what should be the focal length of thelens used to rectify this defect? |
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Answer» please GIVE me 5 star ANYONE then I will TELL him answer and follow thank and give him 5 stars |
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| 9. |
Ranjini makes arrangements for a candle-light dinner and tops it with a dessertof gelatin filled blue berries. If a blueberry that appears at an angle of 45° to thenormal in air is really located at 300 to the normal in gelatin, what is the index ofrefraction of the gelatin? |
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| 10. |
Light enters from air to kerosene having refractive index of 1.47. What is the speed of light in kerosene, if the speed of light in air is 3x10⁸ m/s? |
| Answer» EXPLANATION:the ANSWER is GIVEN below : | |
| 11. |
A real image, 1/5th the size of the object, is formed at a distance of 18 cm from amirror. What is the nature of the mirror? Calculate its focal length. |
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Answer» e is your answer if you love me answer please don't forget to meet me BRAINLIEST and you follow meAs the image is real the mirror has to be CONCAVE. Let its focal length be f. u and v both have to be negative according to the COORDINATE system sign CONVENTION. Also MOD(v) = (1/5)*mod(u). We have As the image is real the mirror has to be concave. Let its focal length be f. u and v both have to be negative according to the coordinate system sign convention. Also mod(v) = (1/5)*mod(u). We have 1/v + 1/u = 1/f or As the image is real the mirror has to be concave. Let its focal length be f. u and v both have to be negative according to the coordinate system sign convention. Also mod(v) = (1/5)*mod(u). We have 1/v + 1/u = 1/f or = -1/18 -1/(5*18) = -6/90 = 1/f or f = -15 cm |
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| 13. |
What will happen when the frequency of rotation in an AC dynamo is doubled? |
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| 14. |
Does magnetic monopole exist? Give reasons. |
| Answer» TIC MONOPOLE will have a NET MAGNETIC CHARGE | |
| 15. |
Is it a converging or diverging lens,If an object 25 cm in front of the lens forms an inverted image 20 cm behind the lens. |
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Answer» it is a CONVERGING LENS |
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| 16. |
Light travels at 1.90 x 10⁸ m/s in a crystal, what is the crystal’s index of refraction? |
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Answer» Refractive INDEX of CRYSTAL is 2Explanation:Refractive index of the crystal=speed of LIGHT in vacuum /speed of light in that crystal=3.8×10*8/1.9×10*8=2 |
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| 17. |
How can you identify the three types of mirrors without touching them?Give reasons. |
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Answer» Explanation: I think we can identify the different mirror by observing the shape and size of the object (SAY your IMAGE) on the different mirrors.Same image of yours: Plane MIRRORIMAGE is large: Convex MirrorSmall image: CONCAVE Mirror |
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| 18. |
A person cannot clearly see objects farther than 12 m from the eye. Name thedefect in vision he is suffering from and the lens that should be used to correct thisdefect. |
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Answer» The PERSON is SUFFERING from Hypermetropiaand the convex lens of suitable POWER should be used. |
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| 19. |
Reena and Vani find a discarded plastic lens lying on the beach. The girls discuss what they learnt in Physics and argue whether the lens is a converging or diverging one. When they look through the lens, they notice that the objects are inverted, If an object 25 cm in front of the lens forms an image 20 cm behind the lens, what is the focal length of the lens? |
| Answer» TION:here here is your ANSWER please do FOLLOW me and MARK BRAINLIEST if you like it | |
| 20. |
A needle placed at 30 cm from the lens forms an image on a screen placed 60cm on the other side of the lens. Identify the type of lens and determine the focallength. |
| Answer» 20 be the FOCAL LENGTH of the GIVEN LENS | |
| 21. |
Write down the names of the specified parts of the human eye, Dark muscular diaphragm that controls the pupil. |
| Answer» IRIS | |
| 22. |
Explain the use of concave mirror as solar concentrators with the help of a raydiagram. |
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Answer» ve mirror converge the rays of light falling on it. so they are used as solar CONCENTRATORS in solar cookers, HEATERS etc. The point where all the reflected rays converge is called as focus. So SUBSTANCE to be HEATED , should be placed at focus.☆☆☆☆ |
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| 23. |
In traffic signals _________ colour light is used to stop vehicles because it has ______wave length. (Hint: scattering of light is inversely proportional to the fourth power of itswavelength) |
| Answer» RED colour light is used to STOP vehicles.It has MAXIMUM wavelength. | |
| 24. |
Focal length of a lens; metre, then for power of a lens____________ (Fill in the blank) |
| Answer» 1 DiopterExplanation:POWER of LEN is equal to 100÷f where f in CM | |
| 25. |
You know that myopia is a common refractive defects of vision. A person with this defect can clearly see only objects that are near. Using concave lens of suitable power this defect is corrected, mention the other two types of defects. |
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| 26. |
A river is flowing eastward with the velocity of 5 km/hour.A Boat moved in a still water moved with a speed of 10 km/hour find out the distance covered by the boat on the other side of the bank while moving vertically from one bank to another bank width of river is 10 metre. |
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Answer» with the DIRECTION of FLOWING of WATER the velocity of boat BECOMES 15km/hour |
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| 27. |
Hola Guys.......✔✔✔ ☺☺☺What is the strongest known magnet in the Universe ?@abhinavnayan#Follow_Me✌No Spamming plz ⚠✖✖✖✖✖✖✖✖✖ |
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Answer» light years away on the other side of the Milky Way GALAXY, lies a stellar monster. An object so dense it packs about the mass of the Sun in the size of a city. An object consisting almost entirely of neutrons. An object so MAGNETIC it can STRIP information from all credit cards on Earth at HALF the Moon distance. Welcome a magnetar.Just how powerful is the magnetic field of a magnetar?A magnetar (a type of neutron star) has a magnetic field as strong as 10¹⁴-10¹⁵ Gauss, making it the most magnetic object (known) in the Universe. To PUT things into perspective, here is a comparison of its field strength to other magnetic objects:✏️Earth’s magnetic field (which deflects compass needles) = 0.6 Gauss✏️A common commercial magnet = ~100 Gauss✏️Sunspots (the most magnetic parts of the Sun) = ~3,000 GaussMRI machines = Up to 70,000 Gauss✏️The strongest steady magnetic field produced in labs = 450,000 Gauss✏️Highly magnetized white dwarf stars = Up to 1 billion Gauss✏️Typical neutron stars = ~1 trillion Gauss |
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| 28. |
Find average velocity from t = 0 to t=8 in given graphx(m) |
| Answer» HELLO MATE PLEASE MENTION the GRAPH | |
| 29. |
ELECTRICITY WORKSH)ClassRoll No.Time35 Min. |MaxMart20THE CORRECT OPTIONS:What is the resistance between P and Q?22922020042D) Infinity(21lad |
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Answer» 16/3..................... |
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| 31. |
Free fall : Discuss the motion of an object under free fall. Neglect air resistance |
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Answer» in the CASE of free fall the NORMAL reaction will be mg.it happens under the influence of gravity.hope this will be HELPFUL. plz. MARK me as BRAINLIEST |
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| 32. |
धारा 370 हटने का मतलब ? |
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Answer» s that ....the kashmiris would not GET the SPECIAL AUTHORITY which they enjoyed previously ..they will be now treated as normal INDIANS... |
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| 33. |
For a motor : a permanent magnet, then commercial motor : _______ (Fill in the blank) |
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| 34. |
How can an AC generator be converted into a DC generator? |
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Answer» The SLIP rings used in the AC generator can be removed and split rings can be replaced instead. Now, AC generator uses concave MAGNETS, change them and lastly remove the coil and REPLACE it with armature instead. The AC generator will start FUNCTIONING as a DC generator. |
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| 35. |
Sitting in her parlour one night, Chitra sees the reflection of her cat in the livingroom window. If the image of her cat makes an angle of 400 with the normal,at what angle does Chitra see the reflected image of the cat? |
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| 36. |
The magnetic field is a quantity that has magnitude only. (Correct the mistakes, if any.) |
| Answer» TION:A magnetic field is a tool used to describe how the magnetic force is distributed in the space and also within something magnetic. Thus, it is the region around a magnet where magnetic force is PRESENT. Magnetic fields can be created by moving the electrical charges. At each STAGE, a magnetic field has a force, that is a magnitude, and at the specified POINT a direction connected with the magnitude. The magnetic field is therefore a VECTOR and the electrical field is a polar vector. | |
| 37. |
Why do the lines of the magnetic field not cross each other? |
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Answer» c field lined do not intersect each other because if there would be INTERSECTION between the magnetic fields then there would be TWO tangents which would represent two different DISTANCES. But it is not POSSIBLE practically to denote to two directions at the same time. Hope it HELPS...!!! |
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| 38. |
What is the magnetic field midway between two parallel conductors carrying sameamount of current in the same direction and in the opposite direction? |
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Answer» same DIRECTION the answer is zero.(USE the cockscrew rule)The magnetic field DUE to both conductors cancel out.When then current directions in both conductors are on OPPOSITE directionsthen the magnetic field will ADD up. |
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| 39. |
From the following statement write down that which is applicable to a commutator. a. A galvanometer uses a commutator for deadbeatb. A transformer uses a commutator to step up voltagec. A motor uses a commutator to reverse the current |
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| 40. |
An overhead wire carries current from east to west. Find the direction of the magneticfield 5cm below the wire. |
| Answer» EAST or west.Explanation:because the CARRIES from east to west then the DIRECTION of MAGNETIC field below 5 CM will be east to west | |
| 41. |
A pencil partly immersed in water in a glass tumbler appears to be bent at theinterface of air and water. Name the phenomenon of light responsible for it. |
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Answer» refraction of light is the phenomenon RESPONSIBLE for the BENDING of the PENCIL |
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| 42. |
Five resistors of resistance ‘R’ are connected such that they form a letter ‘A’. Find theeffective resistance across the free ends. |
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Answer» udent,◆ Answer -Req = 8R/3● Explanation -Top 2 RESISTORS are connected in series.R' = R + RR' = 2RThis COMBINATION of 2 resistors is connected in parallel to resistor in the middle.1/R" = 1/R + 1/R'1/R" = 1/R + 1/2RR" = 2R/3This combination is in turn is series combined with 2 resistors at the base.Req = R + R" + RReq = 2R + 2R/3Req = 8R/3Therefore, the effective resistance across FREE ends is 8R/3.Thanks dear... |
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| 43. |
The phenomenon of producing an emf in a circuit whenever the magnetic flux linked with a coil changes is________. i) electromagnetic induction ii) inducing current iii) inducing voltage iv) change in current) |
| Answer» EXPLANATION:ELECTROMAGNETIC INDUCTION | |
| 44. |
Veena’s car radio will run from a 12 V car battery that produces a current of 0.20 A evenwhen the car engine is turned off. The car battery will no longer operate when it haslost 1.2 x 106 J of energy. If Veena gets out of the car, leaving the radio on by mistake,how long will it take for the car battery to go completely dead, i.e. lose all energy?(1 day =86400 second) |
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| 45. |
An electric current through a metallic conductor produces _________ around it.i) magnetic field ii) mechanical force iii) induced current |
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| 46. |
Raman’s air-conditioner consumes 2160 W of power, when a current of 9.0 A passes through it, What is the voltage drop when the air-conditioner is running? |
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Answer» given the amount of power consumed by Raman’s air-conditioner when a current of 9 A flows through it.(i). The meaning of voltage drop simply means the potential difference across Raman’s air conditioner when it is running which we have to find ,Now to find the potential difference by knowing power and amount of electric current passing through passing through it we can use this relation ,P = V× I ,V(II). In INDIA, we have a household voltage of 220 V current supply,which changes time to time and in very SHORT time intervals.As there is no major difference in 220 V and 240 V A.C. supply , which we will study in higher classes not in this class in detail , So yes these are comparable VOLTAGES and this air conditioner can be used in houses.(iii). If raman tries to connect his air conditioner to a 120 V supply line , then his air conditioner would do less amount of work and deliver less power(rate of doing work) , also as it’s potential difference is reduced to half and of course it’s resistance is constant , so the current passing through it would also become less and will be reduced to half itself , so basically the power would become 1/4th of the original power , also this situation might DESTROY your appliance or the air conditioner in Raman’s case.Hope it helps..!!.. |
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| 47. |
The effective resistance of three resistors connected in parallel is 60/47 Ω. When onewire breaks, the effective resistance becomes 15/8 ohms. Find the resistance of thewire that is broken. |
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Answer» The effective RESISTANCE of three resistors connected in PARALLEL is 60/47 Ω. When ONE WIRE breaks, the effective resistance becomes 15/8 ohms |
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| 48. |
A wire is bent into a circle. The effective resistance across the diameter is 8 Ω. Findthe resistance of the wire. |
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Answer» the RESISTANCE of the WIRE is more |
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| 49. |
What measures would you suggest to minimize environmental pollution caused byburning of fossil fuel? |
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Answer» Here are some of the steps to MINIMIZE environmental pollution caused by burning of fossil fuel:Increase the use of solar,wind and hydro power.Smokeless appliances can be used as alternate solution which can reduce pollution due to fossil fuels.Afforestation should be promoted which helps in controlling the air pollution caused due to burning of fossil fuels.Explanation:The burning of fossil fuel RESULTS in SULPHUR oxides, Co2, nitrogen oxides and hydrocarbons.Sulphur and nitrogen oxides are a result of bad exhaust MANAGEMENT system in vehicles, and manufacturers have to be told to improve exhaust management system.Hydrocarbons has to be taken CARE of by better engine efficiency.Finally, water pollution is the result of oil leakage, which has to be stopped by better shipping arrangements.please mark it as brainliest..... |
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| 50. |
Which form of energy leads to the least amount of environmental pollution in theprocess of harnessing and utilization? Justify your answer. |
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