Saved Bookmarks
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. |
State ohms law and deduce it from drift velocity concept |
|
Answer»
Brainly.in What is your question? Secondary SchoolPhysics 5 points State and derive Ohm's law using concept of drift velocity Ask for details Follow Report by GyanendraSingh11 12.05.2018 Answers Me · Beginner Know the answer? Add it here! batradivjyot25 batradivjyot25 Ace Hey dear . . Here is your answer ☺ ➡ Statement of Ohm's Law : ⭐Ohm's law states that the current flowing through a CONDUCTOR is directly proportional to the potential difference ACROSS its two ends, provided that the physical conditions ( temperature, mechanical strain, etc ) remain constant. ... ⭐ Electric current is defined as the rate of flow of electric chargethrough a conductor. ➡Derivation : ➡Consider a current of length l and cross sectional area A. When a potential difference V is applied across its ends, the current produced is I. If n is the number of electrons per unit volume in the conductor and VD the drift velocity of electrons, then the relation between current and drift velocity is I=neAvd .........(i) Where e is the electric charge on the electron. Electric field produced at each point of wire, E=Vl ............(ii) If τ is the relaxation time and E is the electric field strength, then drift velocity vd=eτEm .............(iii) Substituting this value in equation (i), we get I=neA(eτEm)or, I=ne2τmAE ...........(iv) From equation (ii) I=ne2τAmVlor, VI=mne2τlA ...............(v) Under given physical conditions such as temperature, pressure etc., for a given conductor mne2τlA=R=a constant .........(vi) For a given conductor, R is a constant and is known as the resistance of the conductor. Thus, from equation (v) and (vi) VI=R This Ohm's law. Hope it HELPS You out ⭐^_^⭐ Thanks ⭐(^^)⭐ plz mark as brainlist answer |
|
| 2. |
1. Plan to go to a place by a vehicle. Take readings of odometer and speedometer after every 5minutestill vou reach your destination. Record these observations in tabular form: plot graphs betweendistance time and speed time. State whether this motion is uniform or non-uniform. |
|
Answer» Now i am GOING to a TOWN 30KM away from me in a car. at strating odometer-19,416 speedometer-0 first 5MIN odometer-19,426 speedometer 120kmph second 5min odometer-19,431 speedometer-60kmph third 5min odometer-19441 speedometer-120kmph fourth 5min odometer-19446 speedometer-60kmph this is non-uniform |
|
| 3. |
Suppose you are travelling from New Delhi to Jaipur travelling by road on an educational trip write a write a story about your trip using following wordsa.busb.uniform motionc.non uniform motiond.distancee.displacementf.speedg.average speed h.taken time i.hoursj.kilometersk.accelerationl.odometerm.speedometern.motion |
Answer» BUS............................... |
|
| 4. |
The neem tree is native to India and found allover the country. For centuries it been known as a highlymedicinal plant. Its leaves, flowers, bark and oil been usedas home remedies right from ancient times. An excellenttooth-brush can made of the neem twigs. Neemis also for its antibiotic properties. A pasteof neem leaves used in the treatment of chicken pox.Water in which neem leaves have boiledcan used for washing skin which is inflamed and infected.omissions^write the missing words and before and after word..... |
Answer» Omission :a) The neem tree is native to India and is found all b) over the COUNTRY. For centuries it has been known as a highly c)MEDICINAL plant. Its leaves, flowers, bark and oil have been used d)as HOME remedies RIGHT from the ancient times. An excellent e)tooth-brush can be made of the neem twigs. Neem f) is also known for its antibiotic properties. A paste g) of neem leaves is used in the treatment of chicken pox. h) Water in which neem leaves have been boiled i) can be used for washing SKIN which is inflamed and infected. |
|
| 5. |
How long eye remains functiong after death |
|
Answer» when HUMAN being DIED there I STOP FUNCTIONING after death thanks me PLEASE |
|
| 6. |
Write 100 words about electromagnet |
|
Answer» Answer: An ELECTROMAGNET is a type of magnet in which the magnetic field is PRODUCED by an ELECTRIC current. Electromagnets usually consist of wire wound into a COIL. A current through the wire creates a magnetic field which is concentrated in the HOLE, denoting the center of the coil. |
|
| 7. |
A train moving at uniform speed along a curved track is said to have a variable velocity. Explain. |
|
Answer» Explanation: as velocity is a vector quantity, it MUST also have a direction. when an object is traveling in a CIRCLE, it's direction changes at every point, so velocity also changes at every point plz mark BRAINLIEST as it is larger and BETTER |
|
| 8. |
I need the answer of 8 and 9 plz answer |
|
Answer» 8) u=? v=0 and a= 0.5 m/s^2 s= 16 now v^2=u^2+2as so v^2= u^2 +2×0.5×16 so we GET v^2=16 that MEANS v^2=4m/s^2 2 ANSWER we get |
|
| 9. |
1000 times the length of a metre is called the blank |
|
Answer» Hey Dear, ◆ Answer - 1000 times the metre is 1 kilometer. 1000 m = 1 KM ● EXPLAINATION - • Metre is the SI unit of length. • UNITS of lenth are as related to each other as FOLLOWS -
Hope I was useful. Keep asking.. |
|
| 10. |
Diamond has a refractive index of 2.42.The speed of light in a vacuum is 300,000km/s.Calculate critical angle for diamond? |
| Answer» | |
| 11. |
Find the acceleration of block A and tension in string |
|
Answer» Answer: Q. FIND the MAXIMUM velocity of the bar over its motion. Show options ANSWER SOLUTION Considering the system of forces, ALSO, Integrating both sides we get, At Also, for maximum velocity, THIS SOLVES MY DOUBT CONNECT TO TUTOR |
|
| 12. |
An object is placed at distance of 8 cm from concave mirror of focal length 10 cm. Find position and size of the image |
|
Answer» Answer: Explanation: given that , U= (-8)cm f= (-10)cm and by mirror formula , 1/f=1/v+1/u = 1/(-10)=1/v+(1/(-8)) = -1/10=1/v -1/8 = -1/10+1/8= 1/v = ((-4 )+ 5)/40=1/v = 1/40=1/v = v=40 cm so image is at 40 cm behind mirror, it is VIRTUAL erect and enlarged. |
|
| 14. |
if theta is 60 and radius of circular path is 7 cm find displacement (only answer)(objective question) |
| Answer» | |
| 15. |
Hey matesplz say the exact formula of projection of vectors with explanationdon't copy from googleNO SPAM |
|
Answer» Hey MATE below is your formula... and i try to describe it...... The formula for the projection vector is given by \begin{align*}proj_u V=\left(\frac{u \CDOT v}{| u. ... A scalar projection is the length of the vector projection. It is given by the dot product of a vector with a UNIT vector for that direction. Sorry but i can't describe it clearly ♥...............♥...............♥mark me in the brain list........♥................♥................♥.............♥..................♥...................♥ |
|
| 16. |
What is the importance of distance time graph? |
|
Answer» The time-distance graph determines the change in the position of the entity. The INCLINE of a distance-time graph REPRESENTS the SPEED of an entity. The velocity of an object is its speed in a particular direction. The slope on a velocity-time graph shows the acceleration of an object. |
|
| 17. |
What is a torque difinition |
|
Answer» hey mate...... here os your answer. Torque is a twisting or turning force that TENDS to CAUSE rotation around an axis, which might be a center of mass or a FIXED point. |
|
| 18. |
What does an odometer in a car measure distance or displacement? |
|
Answer» Answer: Explanation: ODOMETER is a device that measures the DISTANCE TRAVELED by a VEHICLE. It measures the total distance between the initial or final position. It is used to MEASURE the position but not the displacement. |
|
| 20. |
(76.) The focal length of a convex lens is 18 cm andthe size of the image is a quarter of the object.The object is situated at a distance of:(1) 90 cmO (2) 54 cm(3) 22.5 cmO (4) 60 cmoo |
|
Answer» Answer: 54cm Explanation: A point object is situated at a DISTANCE of 54cm from the center of the sphere of RADIUS 18cm and refractive index 1.5. Locate the POSITION of the IMAGE due to REFRACTION through the sphere. |
|
| 21. |
The resultant of two equal force acting at right angle to each other is 14N. Find the magnitude of each force |
| Answer» | |
| 22. |
A molecule of an element or a compound is represented by its....... |
|
Answer»
|
|
| 23. |
A train passes a 90 m long platform in 30 seconds and a man standing on the platform in 15 seconds. The speed of the train is |
|
Answer» the TRAIN speed is 45because 30half of 15 in this WAY 90 is half of 46 |
|
| 25. |
If increase in linear momentum of body is 50%,then change in its kinetic energy isa. 25% b. 125% c. 150% d. 50% |
| Answer» | |
| 26. |
46. A capacitor is charged with a battery and energystored is U. After disconnecting battery anothercapacitor of same capacity is connected in parallelto the first capacitor. Then energy stored in eachcapacitor is(1) U/2(3) 4U(2) U/4(4) 2U |
|
Answer» Answer: 2) U/4 Explanation: LET Q be the charge on each CAPACITOR. Now, when battery is disconnected and another capacitor of same CAPACITY is connected in PARALLEL to the first capacitor, then voltage across each capacitor, V = q/2C Read more on Sarthaks.com - https://www.sarthaks.com/226974/capacitor-is-charged-with-battery-and-energy-stored-after-disconnecting-battery-another |
|
| 27. |
a body starts from rest with an acceleration 2 m/s^2 till it attains the maximum velocity then retards to rest with 3 m/s^2 .if total time taken is 10 s,then maximum speed attained is: |
|
Answer» .................... |
|
| 28. |
Explain the motion of the sun in a circular path |
|
Answer» Answer: a PLANET moves around the sun in a CIRCULAR path for which the gravitational force of attraction on the planet by the sun provides the necessary CENTRIPETAL force |
|
| 29. |
What is the formula for displacement and retardation |
|
Answer» Disp= Velocity*TIME Retardation= Change in velocity / Time and then change the sign. i.e. if you get + MAKE it - or if you get - make it plus. |
|
| 30. |
A bus decreases its speed from 80km/h to 60km/h in 5 sec. Find the acceleration of the bus. |
|
Answer» Answer: iinitial VELOCITY is 80 km/h = 200/9 m/s final velocity is 60 km/h = 50/3 m/s time taken is 5s therefore acceleration is (v-u)/t =(150-200)/9×5 =-10/9 m/s^2 hope this helps you mark it as brainliest and thank me |
|
| 31. |
A child playing with a top which type of motion is this |
|
Answer» Rotational MOTION The CHILD when drops the top, it rotates. |
|
| 32. |
How to solve the conservation equation for energy momentum tensor? |
|
Answer» the law of conversation of energy is ONE of the BASIC law of PHYSICAL along with the conversation of the mass and the conversation of mass and the conversation of momentum |
|
| 33. |
A car moves in a straight line from rest at t=0. It accelerates with 2m/s^2.Time= 10 min, find displacement and velocity. |
|
Answer» DISPLACEMENT is 360000m and SPEED is 1200 |
|
| 34. |
Length of curved line cannot be measured by metre scale directly state true or false |
|
Answer» it can be measured but it MUST be a CURVED scale which u can buy on any online SHOPPING website |
|
| 35. |
5.A body moves in the southern direction for10 s at the speed of 10ms-1. It then startsmoving in the eastern direction at the speedof 20ms-7 for 10s. The average speed is. The total displacement willbe |
|
Answer» ANSWER:vzejdlrif R we E e e e fcerrvct TT t tt t y Explanation: |
|
| 36. |
If linear momentum of a body is increased by 0.1% then what is the increase % of kinetic energy |
|
Answer» INCREASED PERCENTAGE will be 0.1% |
|
| 37. |
To measure the diameter of tree you can use measuring tape or thread search true or false |
|
Answer» Answer: Explanation: |
|
| 38. |
2 examples of scalar and vector quantity.;) |
|
Answer» Explanation: 1. Scalar quantity ::: speed , volume , temperature , mass 2. Vector quantity ::: acceleration , momentum , displacement, work , power |
|
| 39. |
Please solve this , A circuit consisting of a 24 ohm battery,a 10 ohmresistance, 5 ohm resister , an ammeter and a plug Key are all connectedin series. Calculate the A reading andthe P.D. at the ends of a 10 ohm resistor. |
|
Answer» HEY mate here is your answer!! HOPE this helps you!! and battery's voltage is always WRITTEN in Volts not in ohm....so its 24V not 24 ohm |
|
| 40. |
What is angle of incidence if angle of reflection is 45 degree???plzzz fast answer |
|
Answer» Answer: 45 degree Explanation: this is because ANGLE of INCIDENCE= angle of reflection hope it HELPS! |
|
| 41. |
What is the equation for motion for a) free falling b) uniform retardationplease follow me friends please please. |
|
Answer» A) u would be zero as the object is not thrown there’s a free fall n the object was in rest earlier n when it was dropped it’s state changed to motion .v would be the final velocity |
|
| 42. |
10 millimetre is equals to 1 metre true false |
|
Answer» because 10 mm = 1 cm |
|
| 43. |
Name and define the physical quantity whose SI unit is coulomb by volt |
|
Answer» CAPACITANCE has the SI UNIT of this TYPE |
|
| 44. |
A particle is moving with uniform velocity what is its acceleration |
|
Answer» Answer: O Explanation: Since VELOCITY is CONSTANT so ACCELERATION is zero |
|
| 45. |
What is non uniform motion....? |
|
Answer» Non-Uniform MOTION. A BODY is SAID to be in a non-uniform motion if it travels unequal distances in equal intervals of time. |
|
| 46. |
List 2 electrical appliances made by using permanent magnets |
| Answer» | |
| 47. |
How to perform impedance analysis for piezoelectrical? |
|
Answer» ->> This paper performs an ANALYSIS of MAXIMUM power output of piezoelectric ENERGY harvesters. It has been OBSERVED .. |
|
| 48. |
If a particle is thrown vertically upward theb its velocity |
| Answer» | |
| 49. |
Give an example of motion in which average belocity is zero |
|
Answer» The example of motion in which average velocity is zero - circular motion. |
|