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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. |
किसी वस्तु का प्रतिबिंब नेत्र के किस भाग पर बनता है ? |
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| 2. |
B represent a uniform magnetic field parallel to the plane of paper west to east. state whether there will be any induced current in the conductor xy when it moves: (1) in the direction of b (2) perpendicular to b in the plane of paper? (3) upwards and perpendicular to the plane of paper .in each case give the direction of induced current if any and also name the rule applied to determine the direction |
| Answer» GENERATED is given by the LAW,E = Blvsinθand the direction of current is given as perpendicular to both B and V and is governed by fleming's left hand rule.1) angle between B and v, θ = 0=> E = Blvsinθ = 0Hence no current flows.2) angle between B and v, θ = 90E = Blvsinθ = BLV v is perpendicular to b in the plane of paper The direction of current is perpendicular to both B and v i.e upwards and perpendicular to the plane of paper3) angle between B and v, θ = 90E = Blvsinθ = Blv v is upwards and perpendicular to the plane of paper.The direction of current is perpendicular to both B and v i.e perpendicular to b in the plane of paper. | |
| 3. |
Why should a magnet not kept beside cassettes,mobile etc.? |
| Answer» MAGNET ATTRACT CASSETTE, MOBILE ETC | |
| 4. |
How do we know the occurrence of earthquake |
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Answer» rthquakes occur ALONG tectonic plate boundaries, along cracks in the lithosphere called faults, or along the mid-oceanic ridges but the MAJORITY of theseismic ENERGY released in the world is from earthquakes occurring along the plate boundaries, particularly around the Pacific Rim or the so-called Ring of FIRE |
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| 5. |
Let c be the capacitance of a capacitor discharging through a resistor r. Suppose, t1 is the time taken for the energy stored in the capacitor to reduce to half its initial value and t2 is the time taken for the charge to reduce to one-fourth its initial value. Then, the ratio t1/t2 will be |
| Answer» 2C U = Umax/2 q = Q0/v2 q = Q0 e-t/RC LN(q/Q0) = -t/RC t = RC ln(Q0/q) At t1 ; q = Q0/√2 and t1 = (RC/2) ln2 At t2 ; q = Q0/4 and t2 = 2 RC ln2 t1/t2 = 1/4 The solution of this is given in the FOLLOWING image. | |
| 6. |
Deduce a equivalent focal length of two convex lenses of focal lengths f1 and f2 when placed in contact. |
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Answer» he lens addition formula adds the reciprocal of the component focal LENGTHS , the resulting focal length will be 1/2 the original focal length.Here’s the break down: 1/f = 1/F1 + 1/f2. where f1 = f2.1/f = 1/f1 + 1/f1 = 2/f1, so f = f1/2.Similarly, if THREE lenses were placed in contact, then the COMBINED focal length would be 1/3 of a SINGLE lens.I hope this will help youIf not then comment me |
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| 7. |
a thin prism of 2° angle gives a deviation of 1°.what is the value of refractive index of the material |
| Answer» TIVE index-1)×A=DRefractive index=D/A +1 =1/2 +1 =0.5+1 =1.5 | |
| 8. |
When and where mirage is seen |
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Answer» happen when the ground is very hot and the air is cool. The hot ground WARMS a layer of air just above the ground. When the light moves through the COLD air and into the layer of hot air it is refracted (BENT). A layer of very WARM air near the ground refracts the light from the SKY nearly into a U-shaped bend |
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| 9. |
The box is made of insulating material such as plastic .why? |
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Answer» is made of insulating MATERIAL such as plastic or WOOD so that the heat absorbed by the COOKER does not radiate out. (B) The inner walls of the box are painted black because a black SURFACE absorbs the maximum amount of heat from sunlight. |
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| 11. |
What is the diff between mass and weight 4 point each |
| Answer» E is UR answer... Mass :- ♥ mass is the matter contained by an object.♥ it cann't be zero.♥it doesn't change according to LOCATION. ♥ it is a scaler quantity and has a magnitude.♥ it is MEASURED in kg.weight : - ♥ it depeng on the effect of gravity.♥it can be zero if no gravity ACTS upon.♥it can be increase or decrease with gravity.♥it is a vector quantity.♥it is measured in newtons | |
| 12. |
a lever of length 9cm has its load arm 5cm long and effort arm is 9cm long. what is the M.A and V.R if the efficiency is 100%? |
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Answer» The mechanical ADVANTAGE and the velocity ratio is 1.8 and 1.8Explanation:Given that,length l = 9 cmload arm = 5 CMEFFORT arm = 9 cmefficiency = 100%The mechanical advantage is defined as:The velocity ratio ISTHE EFFICIENCY is defined as:Hence, The mechanical advantage and the velocity ratio is 1.8 and 1.8 |
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| 13. |
A battery of internal resistance 3 ohm is connected to 20 ohm resistor and potential difference across the resistor is 10v if another resistor of 30 is connected in series with first resistor and battery is again connected to the combination |
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Answer» complete the question properly .The question should have been like this :"A battery of internal resistance 3 ohm is connected to 20 ohm resistor and potential difference across the resistor is 10v if another resistor of 30 is connected in series with first resistor and battery is again connected to the COMBINATION . Calculate the EMF and potential difference across combination "Let the current flowing in the circuit be i and E be the emf of battery By applying Kirchhoff's Voltage law : E-20i-3i=0 E=23i But according to the question : Voltage across 20 ohms is 10V by ohms' law V=IR 10 = i x 20 i= 10/20 = 1/2 A= 0.5 A So emf of battery is E= 23 x i=23x 0.5= 11.5V now if 30 ohms resistance is connected then : Total resistance = 20+30+3=53 OHMS CURRENT : I=E/R=11.5/53=0.216A potential drop across combination of RESISTORS : v=i(20+30)\v= 50X 0.216=10.48V |
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| 14. |
Solar energy can be harnessed directly as well as indirectly give two example of each type |
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| 15. |
Three resister each 100 ohm are connected in series find total resistance of this series |
| Answer» TS....300 .... | |
| 16. |
A far point of myopic person is 80cnin front of the eye.what is the nature and power of lens required to correct the problem Answer as soon as possible |
| Answer» CONCAVE LENS will HELP to CORRECT this PROBLEM | |
| 17. |
What is 2 factors on which speed of sound depend ? |
| Answer» AFFECTING SPEED of SOUND 1.temptature2.median | |
| 18. |
Which of the following is used to find the direction of the magnetic lines of force around a conductor?? a.) Bar magnet b.) Magnetic needle c.) Disc magnet d.) Spherical magnet |
| Answer» C NEEDLE is USED | |
| 19. |
In most cases we cannot see the vibrations of sond producing object with our ear |
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Answer» it VIBRATES with a very very very..... low FREQUENCY and amplitude which makes it difficult to observe..Sound is a machenical energy. It is a form of energy and producing by the VIBRATING objects .....so,,energy cann't visible to us....nd ALSO we cann't able to see...!!!..^_^ |
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| 21. |
What is matter what is its composition |
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| 22. |
How to apply kirchhoff's law when both constant voltage source and constant current source is present |
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Answer» is is your ANSWER. |
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| 23. |
Copper and nichrome wire of same length and area which will get more heated up |
| Answer» E will be GET HEATED up EASILY as its restivity is very low. | |
| 24. |
A tennis ball and a football dropped from a certain height. Which ball touches the ground quickly? Give reason for your answer in detail. |
| Answer» END..Here is your answer..Both the tennis ball and a football touch the ground at same time. This is because the force of gravity pulled everything with the same rate no matter how light and HEAVIER the BODY is...HOPE that it will help you to understand the concept..PLZ mark it as brainliest answer | |
| 25. |
A cubical wooden block of side 10cm floats at the interface between oil and water with its lower face 2cm below the interface. if density of oil is 600 kgm-3 then the mass of the block is |
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| 26. |
Explain how you can locate the pole star with the help of Ursa Major |
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Answer» o the ATTACHMENT...# be BRAINLY@ sanjaykumar1810 |
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| 27. |
A gun is fired in the air at a distance of 660m from a person. He hears the sound of the gun after 2seconds. What is the speed of sound? |
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Answer» that SPEED = distance×time = 660×2 = 1320 m/shope it will HELP you... |
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| 28. |
State the action and reaction in case of when the bullet is fired from the gun |
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Answer» is bullet is GONE in direction of FIRE, while REACTION is gun goes BACK. |
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| 29. |
Which characteristics of sound makes it possible to recognize a person by his voice without seeing him? |
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Answer» itch, frequency, amplitude are characteristics of SOUND MAKES POSSIBLE to recognize a PERSON by his voice WITHOUT seeing him. hope it will help you.... |
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| 30. |
What is an electric fuse? State its purpose in the household electrical circuit. |
| Answer» TRIC fuse is a safety device used to LIMIT the current in an electric circuit.It PROTECTS the appliances of HOMES by stopping the high VOLTAGE of curre. | |
| 32. |
If an object of 10 cm height is placed at a distance of 36 cm from a concave mirror of focal length 12 cm find the position,nature and height of the image. |
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| 34. |
A 400 N girl whose total shoe area is 0.05 m2 stands on the floor. What is the pressure exerted by the girl onth |
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| 35. |
Solve?.............. fastt |
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Answer» ve KARU ....... |
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| 36. |
What is the difference between p type and n type semiconductors? |
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Answer» ference between P - type and n - type SEMICONDUCTORS are the doners or the impurities.Conduction in n - type is through MOVEMENT of ELECTRONS while p - type is through movement of HOLES. |
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| 37. |
Define oscillatory motion Detailed answer required ! |
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Answer» A BUDDY ❄❄❄✨ YOUR ANSWER ____________⏩ it is that MOTION in which a body moves to and fro or back and forth repeatedly about a fixed point in a definite interval of time.in such motion the body is confined within WELL defined limits called EXTREME positions, on EITHER sides of the mean position. ____________☣ hoPe it hEplS ️❤ |
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| 38. |
Describe wave motion in detain. |
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Answer» A BUDDY ❄❄❄✨ YOUR ANSWER ____________⏩ it is a METHOD of transferring energy and MOMENTUM from one point to another without any actual transportation of matter between these points. so it is a kind of disturbance which travel through a material medium due to periodic vibrations of particles of a medium about their mean position without MOVEMENT of particles. ____________☣ hoPe it hEplS ️❤ |
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| 39. |
a metal wire has a resistance of 60.it is cut into three equal lengths .find the equivalent resistance when two parts are connrected in parallel and third part is in series with them |
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| 40. |
there are two bodies of masses 4kg and 5 kg which are 2 meters apart from each other. determine force of attraction between two bodiesthere are two bodies of masses 4kg and 5 kg which are 2 meters apart from each other. determine force of attraction between two bodies |
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Answer» /R^2 |
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| 41. |
Why electroplating applied to metal |
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Answer» plating is done on METALS formaking them LOOK ATTRACTIVE and expensive..by coating an expensive metal on top of a cheap metal LIKE gold on coppersaving them from getting corroded like ZINC on iron[plz mark it the brainliest] |
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| 42. |
If angle of incidence is 30° then angle of refraction and angle of emergence is |
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Answer» that REFRACTIVE INDEX is the ratio if sines of angle of incidence to angle of refraction. That is,Refractive Index = Sin i / Sin rSo given that, Refractive Index is √3 and sin r is 30°=> √3 = Sin i / Sin 30=> √3 * Sin 30 = Sin i=> √3 * 1 / 2 = Sin i=> Sin i = √3 / 2We know that, Sin 60 is √3 / 2. Hence,Sin i = Sin 60 => i = 60°Hence the angle of incidence is 60°.Hope my answer helped |
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| 43. |
Anket from std. 10 usese spectacles . The power of the lens in his spectacles is -0.5 D 1) state the types of lens used in his spectacles |
| Answer» LENS USED in his SPECTACLE | |
| 44. |
when do we consider a person to be myopic or hypermetropic? draw a ray diagram to show a myopic eye. how can myopia be corrected? show with the help of a ray diagram |
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Answer» ider a person MYOPIC when he is able to see NEARBY objects CLEARLY but cannot see far off objects clearly.We consider a person hypermetropic when he is able to see FAROFF objects clearly but cannot see nearby objects clearly.Ray diagram for myopic eyeMyopia can be CORRECTED by using of concave lens |
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| 45. |
The time period of a wave is 0.004second. Determine it's frequency. |
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Answer» the FREQUENCY |
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| 46. |
Supriya runs a marathon race in 50 minutes at an average speed of 48 km per hour |
| Answer» EDIT the question and then ask it again in a PROPER WAY vese agr isma distance NIKALNA h to distance=speed*time So,distance=48m/sec*3000sec (50min=50*60sec=3000sec)Distance=144000m/sec Ans~ | |
| 47. |
You are walking against strong wind is the wind on you positive,negative or zero |
| Answer» E WIND. ......... | |
| 48. |
Define reverse saturation current |
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Answer» ...mate .....❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️When the diode is reverse biased then the depletion REGION width increases, majority ... the current is almost constant KNOWN as reverse saturation current ICO.hope it helps U.....PLS follow me & brainliest pls....✌️ |
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