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. |
Explain overloading of household circuit.give examples. |
|
Answer» conductor of electricity DRAWS a lot of current (more than its capacity) an overload occurs.one way to PREVENT it is using thick wires which can bear a lot of current overloading happens when heavy current PASSES through the wire and excessive heating takes place.2 ways by which this happens1) Live and neutral wires come in contact with each other....overloading occurs....2) Connecting too MANY appliances to a single socket.. this makes excessive heating and overloading occurs here....Prevention....1) Proper insulation....# HOPE THIS HELPS U...Select BRAINLIST answer please |
|
| 2. |
Explain Kirchhoff’s laws.and give two or three examples. |
|
Answer» tion:Current flow in circuits is produced when charge carriers travel though conductors. Current is defined as the rate at which this charge is carried through the circuit. A fundamental concept in physics is that charge will always be conserved. In the context of circuits this means that, since current is the rate of flow of charge, the current flowing into a point must be the same as current flowing out of that point.Figure 1Three WIRES connected at a node with I1 and I2 TRAVELLING towards the node and I3 travelling away from the nodeThree wires connected at a node with different currents travelling down each wire.Kirchhoff's current LAW states that for the diagram above, the currents in the three wires must be related by:1+2=3I1+I2=I3It is important to note what is meant by the signs of the current in the diagram - a positive current means that the currents are flowing in the directions indicated on the diagram.The standard WAY of displaying Kirchhoff's current law is by having all currents either flowing towards or away from the node, as shown below:Figure 2Three wires connected at a node with different current travelling down each wire TOWARD the node with each current labelled I1, I2 and I3. Here, at least one of the currents will have to be negative (i.e, away from the node and in the opposite direction to the arrows on this diagram)and Kirchhoff's current law can be written as:1+2+3=0I1+I2+I3=0This can be generalised to the case with n wires all connected at a node by writing:∑=1=0 |
|
| 3. |
How can you verify that the resistance of a conductor is temperature dependent? |
|
Answer» When temperature INCREASES, free electrons of the conductor gain more KINETIC energy. As a result, they collide more FREQUENTLY with other electrons as well as PROTONS inside the conductor. This collisions contribute for the increase of resistance. |
|
| 4. |
What is hybridisation? Explain the formation of the following molecules using hybridisation a) Be CI₂ b) BF₃ |
|
Answer» The FORMATION of bonds is no less than the act of courtship. ATOMS come closer, attract to each other and gradually LOSE a LITTLE part of themselves to the other atoms. In chemistry, the study of BONDING, that is, Hybridization is of prime importance. What happens to the atoms during bonding? What happens to the atomic orbitals? The answer lies in the concept |
|
| 5. |
How does a battery work? Explain in ten examples. |
|
Answer» of Battery:The battery is a device which is made up of three compounds namely anode, CATHODE and electrode. The chemical energy which is present in the battery is converted into electrical energy. The electrons which are PRODUCED in the anode region moves to the cathode through pathway in which when electronic ITEMS connected receives power and works. The examples of items which works with battery are: Remote ALARM clock Electronic TOYS Games Watch Mobile phone Camera Laptop Inverter Electronic toys |
|
| 6. |
An element ‘A’ forms a chloride ACl₄The number electrons in the valence shell of ‘A’[ ]a) 1 b) 2 c) 3 d) 4 |
| Answer» ANS 4Explanation:because A can MAXIMALLY form BONDS equal to the no of ELECTRONS in its OUTERMOST cpdhell | |
| 7. |
What are direct and indirect band gap semiconductors??? |
|
Answer» For the direct band gap MATERIAL, you have to plot (αhv)2 vs. hv (ENERGY in eV). Where, α is ABSORPTION coefficient (cm-1), hv is energy in eV. Then, the direct band gap energy, Eg, can be obtained by extrapolating the linear portion to (αhv)2 = 0 in that GRAPH. For the INDIRECT band gap material, you have to plot (αhv)1/2 vs. hv (energy in eV). Where, α is absorption coefficient (cm-1), hv is energy in eV. Then, the indirect band gap energy, Eg, can be obtained by extrapolating the linear portion to (αhv)1/2 = 0 in that graph. |
|
| 8. |
What is scope of classical physics |
|
Answer» scope of classical PHYSICS are mechanics, electrodynamics, OPTICS and THERMODYNAMICS |
|
| 9. |
a uniform chain of mass M and length L is lying on a horizontal table with one third of its length hanging over the edge of the table if the chain is in limiting equilibrium what is the coefficient of friction for the contact between the table and chain |
|
Answer» 0.5Explanation:MASS of CHAIN on table = (2/3)*MFriction force = UMG = u(2/3)*MgThis will be equal to mg of HANGING partMg/3 = u(2/3)*Mgu = 1/2 = 0.5 |
|
| 10. |
Adding of oxygen gives bad result in one natural process what is that? how can you rectify that |
|
Answer» in plants photoresiration TAKES PLACE EXPLANATION:in which OXYGEN is not. useful hopeit HELPS uu |
|
| 11. |
What is meant by nuclear force |
|
Answer» tion: it is a STRONG ATTRACTIVE force between nucleons in the ATOMIC nucleus that HOLDS the nucleus together |
|
| 12. |
Write down the integral form of modified ampere's circuital law. |
| Answer» REFER the ATTACHED PICTURE. | |
| 13. |
What is meant by electromagnetic force |
| Answer» ELECTROMAGNETIC Force. A FUNDAMENTAL force in nature, the electromagnetic force acts between charged particles and is the combination of all electrical and magnetic forces. ... For EXAMPLE, the electromagnetic force holds atoms TOGETHER in molecules, causes friction, and ATTRACTS iron to a magnet. | |
| 14. |
What is meant by centre of mass |
| Answer» POINT where the COMPLETE MASS of the BODY is concentrated.ʜᴏᴘᴇ ɪᴛ ʜᴇʟᴘs ʏᴏᴜ☺ƒσℓℓσω мє σท iทsτα✌♥ | |
| 15. |
Write two examples of Newton's first law and third law of motion |
|
Answer» first law - Inertia.ExampleShaking of TREES results in dettaching of leaves.When car suddenly changes its direction at high speed, we move TOWARDS other direction due to inertia of direction.Newtons thirld law.We move/walk AHEAD by pushing the surface of road backward with foot.A rocket for launching releases high ENERGY towards BACK to get high reaction to launch up in the air.HOPE IT HELPS... |
|
| 16. |
Define Archimede's principle |
|
Answer» tion:a LAW stating that a body totally or PARTIALLY immersed in a FLUID is SUBJECT to an upward force equal in magnitude to the weight of fluid it displaces. |
|
| 17. |
What are errors in measurement |
|
Answer» tion:Generally errors are classified into three types: systematic errors, random errors and blunders. GROSS errors are caused by mistake in using instruments or METERS, calculating measurement and recording data results. The best EXAMPLE of these errors is a person or operator reading PRESSURE GAGE 1.01N/m2 as 1.10N/m2. |
|
| 18. |
an object of height 4 cm placed at 20cm before the concave mirror of focal length 15 cm . find the magnification and explain the nature of the image |
| Answer» REFER to the ATTACHMENT. | |
| 19. |
a boy is shouting his name at regular intervals. The sound is reflected from a building at distance 80m .what should be the interval such that his voice coincides with his echo?(speed of sound in air=320 m/s) |
| Answer» ECHO = 160 metrejsjssjsjshdbdb | |
| 20. |
a particle with certain initial velocity is uniformly accelerated . if it covers 25 m in 5th second and 49m in 7th second of it's motion determine the distance travelled by it in 10sec. |
|
Answer» S = v t + 1/2 a t^2S(5) - S(4) = v (5 - 4) + 1/2 a (25 - 16) TRAVELED in 5th secS(7) - S(6) = v (7 - 6) + 1/2 a (49 - 36) " " 7TH "25 = v + a/2 * 949 = v + a/2 * 1324 = 2 a SUBTRACTING equationsa = 122 v = 74 - 6 * 22 adding equationsv = -29S(10) = -29 * 10 + 12 * 100 / 2 = 310 m total DISTANCE in 10 secCheck:S(5) - S(4) = -29 * (5 - 4) + 1/2 * 12 (25 - 16) = 54 - 29 = 25 |
|
| 21. |
An element 11X23 forms an ionic compound with another element ‘Y’. Then the charge on theion formed by X is [ ]a) +1 b) +2 c) -1 d) -2 |
|
Answer» udent,◆ Answer -(a) +1◆ EXPLAINATION -For element X, ATOMIC NUMBER is 11.Electronic CONFIGURATION of X would be E.C. = 1s2 2s2 2p6 3s1 = [Ne] 3s1Element X has only 1 electron in its outermost orbit, THEREFORE it donates this e- to element Y forming X+ cation.Hence, charge on ion formed by X is +1.Hope this helps you |
|
| 22. |
Predict the reasons for low melting point for covalent compounds when compared with ioniccompound. |
|
Answer» tion: the MELTING point of covalent compounds is LOW DUE to weak Vander waal's force of attraction between covalent MOLECULES |
|
| 23. |
Plzz answer this question it is of std 11 physics question |
| Answer» YES i will ANSWER after WARD EXPLANATION: | |
| 24. |
What is meant by non uniform circular motion |
| Answer» TION:if VELOCITY is not constant is CALLED uniform CIRCULAR MOTION | |
| 25. |
3 29. In the diagram shown in figure, match the following(take, g = 10 m/s2)F2=18 N,WI21 kg 114 kaufrage, AKO T219 7kgF1=60 NYO=30°A.B.Colume IAcceleration of 2kg blockNet force on 3kg blockNormal reaction between 2kg and 1kgNormal reaction between 3kg and 2kgColume II1. 8 SI unit2. 25 SI unit3. 2 SI unit4. 45 SI unit5. NoneD. |
| Answer» PLZ ATTACH the IMAGE ALSO...... | |
| 26. |
Cunmple #20 A ball le projected as shown in figure. The ball will return to pointsyvenient)windgcolo(gravityox (horizontal)А)О(B) left to point o(C) right to point O(D) none of these |
| Answer» DONT WORRY I will be ABLE to ANSWER the QUESTIONS | |
| 27. |
Derive an expression potential energy of a particle performing linear SHM |
|
Answer» tion:(may this help you to understand) At the mean position, the total energy in SIMPLE harmonic motion is ________a) purely kinetic b) purely potential c) zero d) None of the aboveAnswer: a) purely kinetic. At the mean position, the velocity of the particle in S.H.M. is maximum and displacement is MINIMUM, that is, x=0. THEREFORE, P.E. =1/2 K X2 = 0 and K.E. = 1/2 k ( a2 – x2) = 1/2 k ( a2 – O2) = 1/2 ka2. Thus, the total energy in simple harmonic motion is purely kinetic. |
|
| 28. |
A simple pendulum is oscillating. The velocity of the bob at the point A, B, C, D and E are v1 , v2, v3, v4, v5 , respectively. Arrange the velocities in ascending order. |
| Answer» VELOCITY at V3 will be highest at at V1 and v2 it will be jero | |
| 29. |
Explain cells connected in series with neat diagram |
| Answer» DEPEND on TYPE of CELL it is CLASSIFIED | |
| 30. |
A bus starting from rest moves with uniform acceleration 0.5m/s square for 5minute calculated speed required and distance traveled give me answer |
| Answer» SPEED =0.1m/s distance=0.5m EXPLANATION: a = V/t v = at v = 0.5 × 5 v = 2.5m/s v = d/t d = VT d = 2.5× 5 d = 12.5m | |
| 31. |
Why do only valence electrons involve in bond formation? Why not electron of inner shells?Explain. |
|
Answer» Explanation:Because the outer ELECTRONS are losely bounded by the attractive force of the nucleus. also the screening EFFECT of the inner electrons prevent the nucleus to attract outer electrons hence they easily form bondsThis MAY definitely help you. PLS hit the thanks BUTTON |
|
| 32. |
How the positions of elements in the periodic table help you to predict its chemical properties?Explain with an example. |
|
Answer» tion:we can pridict an elements chemical nature by it's place in periodic table.In the periodic table the GROUP which is known as noble gas group is 18th and the elements in this group are all gases and we should say these are noble gases.And the 17th group is known as HALOGENS which are not metals and chemically they are non metals.The elements which are situated in f group are lanthanides and The elements of d group metalsFor EXAMPLE we TAKE CHLORINE which is an element of 17th group and elements of 17th group are called halogens so the chlorine is also a halogen . |
|
| 33. |
Collect information regarding metallic character of elements of IA group and prepare report tosupport the idea of metallic character increases in a group as we move from top to bottom. |
| Answer» C CHARACTER INCREASE DUE to increase in SIZE | |
| 34. |
Without knowing the electronic configurations of the atoms of elements Mendeleev still couldarrange the elements nearlyclose to the arrangements in the Modern periodic table. How canyou appreciate this? |
|
Answer» ev sticked to his periodic arrangement, He was more CONCERNED to place the similar elements in the same group though sometimes it violated his law of increasing atomic mass. He EVENTUALLY could know the trend of properties of unknown elements that were not available at his time This way, He was able to predict new elements and he was also able to arrange the elements like in Modern periodic table. Hence, We can appreciate Dmitri Mendeleev master mind to have thought to arrange elements as per their properties. And More great achievement was that, His periodic table lead us to invention of more elements. Thus, It also worked as main REFERENCE for scientists to CARRY out their research. |
|
| 35. |
Collect the information about reactivity of VIII A group elements (noble gases) from internet orfrom your school library and prepare a report on their special character when compared toother elements of periodic table. |
|
Answer» y of Noble Gases by ABThe noble gases are a group of gases categorised in Group VIII. They are called noble gases because like the noble metals they are relatively nonreactive. These gases are the least reactive elements in the Periodic Table. This is due to their electronic configuration. The outer most shell of these gases has a completely filled valence shell leaving no space for reaction. THUS they have very LITTLE tendency to gain or lose electrons. The noble gases have high ionization ENERGIES and negligible electronegativities. The noble gases have LOW boiling points and are all gases at room temperature. They have no colour, odour, or flavour under ordinary conditions. They are non-flammable. Learn more on Noble Gases:what are noble gases? Name all in the ORDER of their increasing ... brainly.in/question/6490097 why noble gases have stable electronic configuration while atoms of ... brainly.in/question/1441242 |
|
| 37. |
What is rectilinear motion?? |
| Answer» MOTION in a STRAIGHT LINE is CALLED RECTILINEAR motion | |
| 38. |
Q- obtain an expression for the displacement of the particle in nth second . |
| Answer» EXPLANATION:Snth= u+1/2a[2n-1] | |
| 39. |
A man rows across a river with velocity 8 km hl. If his resultant velocity is 10 km h- then what is the speed of river water?[Hint : Vriver = Vresultant - Vman] |
|
Answer» 10-8=2mark as BRAINLIST |
|
| 40. |
Why a chemical reaction is turns to exothermic give an example |
|
Answer» Here's your answer#An exothermic reaction is one in which HEAT is RELEASED ALONG with the formation of product.... #For example = C+O2------>CO2 + heat Hope it HELPS ✌ |
|
| 41. |
A ball is dropped from the top of a tower which is th' meter high, reach the ground in 1 sec. At timemeter the ball will be(1) At the height of meter from the earthssurface(2) At the height of meter from the earth'ssurface(3) At the height of h meter from the earth'ssurface(4) At the height of h meter from the earth'ssurface |
|
Answer» its would H METER only I think so finally keep learningkeep GROWING and thank you for watching |
|
| 42. |
Calculate the pressure in SI unit when a force of hundred dyne on an area of 0.02 CM square |
|
Answer» sryyy i DONT no............ |
|
| 43. |
Some people say that if we start living like our ancestors, this would conserve energy and ecosystem. do u think this idea is feasible. explain. plsss guys only relevant answer and follow |
|
Answer» id and why not its as true as it sounds our ancestors used to travel large distances on foot but we humans now have become lazy and WASTE FUEL which causes pollution hence if we provoke the ideas of oyr ancestors we will not only CONSERVE the ecosystem but will also be ABLE to do something beneficial for our health hope it helps u EMILY |
|
| 44. |
The three initial and final positions of a man on the x-axis are given as(i) (-3 m, 7 m)(ii) (7 m, -3 m)(iii) (-7 m, 3 m)Which pair gives the negative displacement?(a) (i)(b) (ii)(c) (iii)d) (i) and (iii) |
|
Answer» tion:the PAIR which give the negative DISPALCEMENT isoption b) that is II |
|
| 45. |
What is the advantage of using LED in testing the electrical conductivity of liquids. |
| Answer» TION:LED is a semicoductor DEVICE which GLOWS even when a very WEAK current passes through itHOPE IT HELPS U | |
| 46. |
A particle of mass m attached to 3 identical spring A,B,C each of force constant k. If the particle of mass m is pushed slightly against the spring A and released, then time period of oscillation is a)2π√2m/k b)2π√m/k c)2π√m/2k d)2π√m/3k |
| Answer» | |
| 47. |
The magnitude of resultant of three vectors magnitude 1, 2 and 3 whose directions arethose of the sides of an equilateral triangletaken in order is |
| Answer» | |
| 48. |
Properties of ultraviolet radiation |
|
Answer» tion:Ultraviolet waves, with wavelengths from 40-400 NANOMETERS (nm), are those that fall between visible light and X rays on the electromagnetic SPECTRUM. Because ultraviolet light has a frequency higher than that of visible light, it CARRIES more energy and has the ABILITY to PENETRATE our skin. |
|
| 49. |
We launched so many artificial satellites around our earth for different purposes. What is the impact of artificial satellites and their radiation on bio diversity? |
|
Answer» Explanation:Artificial satellites have made our life more comfortable. Beyond the positive outcomes, there are some negative aspects ALSO. Impact of artificial satellites and their radiation on bio diversity are as follows: a. During the LAUNCH of an artificial satellite, a lot of smoke and dust is emitted which pollutes our environment. and disturbs the ecological balance. b Artificial satellites also emit various radiations CAUSING harmful effect on a living organisms. The radiations so emitted also become the REASON of various skin ailments in humans. c. The continuous exposure to the radiation from artificial satellites causes heart and BRAIN problems. d. Due to the absence of methods of recovering the satellites, the universe is becoming heavily crowded with these satellites. |
|