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. |
An object is kept 5 cm in front of a concave mirror of focal length 15 cm. What will be the nature of the image? |
| Answer» IMAGE will be FORMED at INFINITY | |
| 2. |
Describe working of hand pump in half page answer fast and ♊☝☺☺♨☺follow me i will follow you |
|
Answer» Where it is necessary to raise water to a height above that to which a suction or lift pump will operate effectively (about 7 metres), or to raise the pressure so that it will exit a nozzle with a strong force, such as through a fire hose, a force pump may be used. As with a suction pump, in its manual form it relies on an operator to pump a handle. The difference is however that after the water is sucked through the lower VALVE (as a result of raising the piston that is ATTACHED to the handle), its means of exit is via a PIPE or nozzle in the side of the MAIN cylinder. The water, once it has been drawn up above the lower valve and trapped there, is forced out the exit when the piston or plunger is pushed down again on the NEXT stroke.PLZ MARK AS BRAINLIESTAND THANK THIS ANSWERPLZPLZFOLLOW MEHAVE A GREAT DAYBYE♡♡♡♡ |
|
| 4. |
A train starting from rest attains a velocity of 20 m/s in 2 minutes. Assuming that the acceleration is uniform, find 1)the acceleration 2)distance travelled by the train, while it attained this velocity? |
|
Answer» -Velocity = 20m/sTime = 2 minsTo Find :-AccelerationDistance traveled while it attained velocitySolution :-(i)We know that Acceleration = v - u/tHere, u = OV = 20t = 2min = 120secSubstituting in Formula :-A = 20 - 0/120A = 20/120Acceleration = 1/6 m/s²-----------------(II)Using 2nd Law of motion,s = ut + 1/2at²Here,s = distance a = 1/6u = 0t = 120Substituting in formula :-s = 0 X 120 + 1/2 x 1/6 x 120²s = 0 + 1/12 x 14400Distance = 1200m |
|
| 5. |
13 squair root66ry9 |
|
Answer» sExplanation:169 is the SQUARE ROOT of 13 66 square root is 4356 and 9 square root is 81 |
|
| 6. |
Tabulate the following statements as applicable to each of the harmful radiations emitted by natural radio active substances and other radiations (They are electromagnetic radiation. They have high penetrating power. They are electrons. They contain neutrons) |
| Answer» ESTION is UNCLEAR | |
| 7. |
The schematic diagram, in which different components of the circuit are represented bythe symbols conveniently used, is called a circuit diagram. What do you mean by theterm components? |
|
Answer» cuit to be useful you will connect various devices which operates when a potential difference is applied.For example , for lighting a room you connect an ELECTRICAL COMPONENT called light bulb.measuring the current in the circuit we connect a device called AMMETER and for measuring voltage we connect a componant called voltmeter.There is a device called resistor which ACTUALLY causes the current in the circuit.Many more.... |
|
| 8. |
What must be the minimum speed of wind to harness wind energy by turbines? |
| Answer» | |
| 9. |
Fuse wire is made up of an alloy of ___________ which has high resistance and _______. (Fill in the blank) |
| Answer» | |
| 10. |
Two ice skaters of weight 60 kg and 50 kg are holding the two ends of a rope. The ropeis taut. The 60 kg man pulls the rope with 20 N force. What will be the force exerted bythe rope on the other person? What will be their respective acceleration? |
|
Answer» the force exerted on the other PERSON is a pull of 20kg, as 1 Newton is 1kg irrespective of the EARTH's grVitatipnal pull which is 9.8 n which is 1G of force or 96.4m/s so the MAN is being pulled with a constant of 20n which means the man will EXPERIENCE a force 30m/s constant accelaration |
|
| 11. |
A good source of energy would be one which would do a small amount of work per unit volume of mass. (Correct the mistakes, if any) |
|
Answer» A good source of energy would be one which would do a LARGE AMOUNT of work PER unit VOLUME or mass |
|
| 12. |
What is the main raw material used in the production of biogas? |
| Answer» BIOGAS is the mixture of gases PRODUCED by the breakdown of organic matter in the absence of oxygen. Biogas can be produced from raw materials such as agricultural WASTE, manure, municipal waste, plant material, SEWAGE, green waste or food waste. Biogas is a renewable ENERGY source. | |
| 13. |
Two electric bulbs have resistances in the ratio 1 : 2. If they are joined in series, theenergy consumed in these are in the ratio _________. i) 1 : 2 ii) 2 : 1 iii) 4 : 1 iv) 1 : 1 |
|
Answer» it REMAIN the same .1:2 |
|
| 14. |
State Newton’s law of gravitation. Write an expression for acceleration due to gravityon the surface of the earth. If the ratio of acceleration due to gravity of two heavenlybodies is 1:4 and the ratio of their radii is 1:3, what will be the ratio of their masses? |
|
Answer» s brain LIST if it help u plzzz NEWTON's law of universal gravitation states that every particle attracts every other particle in the UNIVERSE with a FORCE which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their CENTERS. |
|
| 15. |
How long will it take to move the mass through 20m, if a 5 N force acts on a 2.5 kg mass at rest, making it accelerate in a straight line, What will be its velocity after 3 seconds. |
|
Answer» (l) 4.5s approx.(ll) 6m/sExplanation:(I) u = 0S = 20m F = 5Nm = 2.5kgF = MA5 = 2.5aa = 5/2.5 = 2m/s^2 S = UT + 1/2 at^220 = 0×t + 1/2 ×2× t×t20 = t^2t = √20 s = 4.5 s approx.(ll) t = 3 SU = 0m/sv= u + atv = 0+2×3v = 6m/s |
|
| 16. |
The mats used in gyms and the padding used in sports uniforms are made up of softsubstances. Why are rigid materials not used? |
|
Answer» because if rigged MATERIALS is USED then people in GYM and those who use padding GET severely jurted |
|
| 17. |
If the force experienced by a body of unit mass is gravitational field strength, find thegravitational field strength on the surface of the earth. |
|
Answer» hat, The force experienced by a body of unit mass is gravitational field strength. Now, We are to FIND Gravitational field strength on the EARTH. By Newton's law of GRAVITATION, We have the equation for force, here, G is the universal gravitational constant. m1, m2 are the masses, r is the distance of separation. In this case, m1 = 1 KG ( Unit mass) m2 = 6 * 10^24 kg ( Mass of earth) r = 6400 * 10^3 ( Distance of separation = distance from center to surface. G = 6.67 * 10^-11 m³ /kgs² Now, Therefore, The Gravitational field strength on the surface of earth is 9.8 N/kg. |
|
| 18. |
A bullet of mass 20 g moving with a speed of 75 ms⁻¹ hits a fixed wooden plank andcomes to rest after penetrating a distance of 5 cm. What is the average resistive forceexerted by the wooden plank on the bullet? |
| Answer» EXPLANATION: the ANSWER is GIVEN below : | |
| 19. |
A shopping cart has a mass of 65 kg. In order to accelerate the cart by 0.3ms⁻² whatforce would you exert on it? |
| Answer» TION:SHOPPING CART MASS=65kgacceleration=0.3m/s2force= mass × ACCELERATION =65kg×0.3m/s2 =19.5N | |
| 20. |
A-4. Shown in the figure are the position time graph for two children going homefrom the school. Which of the following statements about their relative motion istrue after both of them started moving ?Their relative velocity: (consider 1-D motion)(A) first increases and then decreases(B) first decreases and then increases(C) is zeroMD) is non zero constant. |
|
Answer» follow mateExplanation:Slope of a DISPLACEMENT time graph gives us VELOCITY.Here for both the children the graphs are straight LINES (constant slope)Hence both the children have constant velocities. But they are not equal (DIFFERENT slopes).Hence relative velocity v 2 −v 1 =constant(nonzero)Hence option D is correctHOPE IT HELPS...... TAME CARE..... MATE |
|
| 21. |
an athelet runs along a circular track of radius 50m.find the distance travelled and the displacement of the athlete when he covers 3/4 th of the circle |
| Answer» DISTANCE is 235.5Displacement is 78.5Explanation:THETA=90 degree = 90×π/180 = π/2 radianArc LENGTH = theta × r = π/2 × 50 =78.5 = DISPLACEMENT. Distance = 2πr - Displacement = ( 2×3.14×50) - 78.5 =314 - 78.5 = 235.5Hope! I help you Thanks........... | |
| 23. |
. A boat takes two hour to travel 4 km down and 4 km up the river when water is not flowing.If river starts flowing with 2 kmph then time takento make the same trip will be(1) 2 hour(2) 3 hour(3) 2 hour 40 minute (4) 3 hour 40 minute |
| Answer» 2 HOUR because if the river is no flowing in take 2hour to cover 4 kilometre so if the river is flowing it will take HALF EQUAL to 2 hours 2 kilometre PER | |
| 24. |
answer in one word that in an electric circuit from which point to which point does the electrons flow |
| Answer» TION:ELECTRONS FLOW from -ve to +ve | |
| 25. |
Star A is farther than star B which star will have parallax angle |
| Answer» STAR B will have PARALLAX ANGLE | |
| 26. |
A particle is thrown with kinetic energy k straight up a rough inclined plane of inclination a. andcoefficient of friction u. The work done againstfriction before the particle comes to rest isku sina(1) cosa + u sinakucosacosa + u sina(3) sinatkusinasina +ucosaku cosasina + u cosa |
| Answer» EXPLANATION:PIC attachedHope you UNDERSTAND!! | |
| 27. |
Write an experiment to know the reaction of oxygen with metals and non metals |
|
Answer» Action with METALS to form metal OXIDES:-Metal+oxygen=>metaloxide2Mg+O2=>2MgOAction with non metals to form Non metal oxides:--C+O2=Co2Explanation:PLEASE MARK ME AS BRAINLIEST! |
|
| 28. |
Two objects of same mass, namely A and B hit a man with a speed of 20 km/hr and50 km/hr respectively and comes to rest instantaneously. Which object will exert moreforce on that man? Justify your answer. |
| Answer» TION:I THINK QUESTION is INCOMPLETE. | |
| 29. |
If the radius of the earth is reduced to half of its present value, with no change in themass, how will the acceleration due to gravity, be affected? |
|
Answer» The acceleration due to GRAVITY depends on the mass of the BODY, the distance from the center of mass, and a constant G, which is called the "universal gravitational constant". ... The acceleration due to gravity on the SURFACE of the MOON is 1.620 m/s2. 2) The RADIUS of the Earth is 6.38 x 106 m. |
|
| 30. |
The important use of cryogenics is cryogenic fuels. What do you mean by cryogenicfuels? |
|
Answer» important use is as fuel in Spaceships .Explanation:Cryogenics is the scientific study of materials and their PRODUCTION and behavior at very low temperatures. This word is originated from the Greek cryo, which means "cold", and genic, which means "PRODUCING"cryogenic fuels are USED in machinery that operates in space (e.g. rocket ships and satellites) because ordinary fuel cannot be used there, as ENVIRONMENT does not supports combustion there.Cryogenic fuels are fuels that require storage at very low temperatures in order to MAINTAIN them in a liquid state. Cryogenic fuels generally constitute liquefied gases |
|
| 31. |
Match the items in group A with the items in group B: Group-A 1. Small dimension 2. Large dimension 3. Long distance 4. Small distance Group-B A. Kilometre B. Screw gauge C. Scale D. Light year E. Altimeter Match the following. |
|
Answer» udent,◆ MATCHED columns -(1) Small dimension => (B) screw gauge(2) LARGE dimension => (C) scale(3) Long distance => (D) light year(4) Small distance => (A) kilometer# Units of distance -1 kilometer = 1000 metre1 lightyear = 9.46×10^5 m1 mile = 1609 m1 FOOT = 0.3 mThanks dear. Hope that was helpful to you... |
|
| 32. |
Fill in the blanks:The special methods adopted to determine very large distances are ____________ and ________________.1. Laser pulse method 2. Light year method 3. Radio echo method 4. Astronomical method) |
|
Answer» The SPECIAL methods adopted to determine very LARGE DISTANCES are" RADIO Echo Method " and " Laser Pulse Method " .Explanation:(◍•ᴗ•◍)❤Lucky(●’3)♡(ε`●) |
|
| 33. |
When ethanol vapour is passed through bromine water, why does no change occur? |
| Answer» SENCE of the double bond in alkenes makes them more reactive than alkanes. An alkene will turn brown bromine WATER COLOURLESS as the bromine reacts with the carbon-carbon double bond. In fact this reaction will occur for UNSATURATED compounds containing carbon-carbon double bonds. | |
| 34. |
Organic compound ‘A’ of molecular formula C₂H₆O liberates hydrogen gas with sodium metal. ‘A’ gives ‘B’ of formula C₄H₁₀O, when it reacts with concentrated H₂SO₄ at 413K. At 443K with concentrated H₂SO₄ ‘A’ gives compound ‘C’ of formula C₂H₄. This compound ‘C’ decolourises bromine water. What are ‘A’, ‘B’ and ‘C’? |
|
Answer» udent,◆ Answer - COMPOUND A => EthanolCompound B => Diethyl etherCompound C => Ethene◆ Reactions -Ethanol (A) liberates hydrogen gas with sodiummetal.2C2H5-OH + 2NA --> 2C2H5-ONa + H2Ethanol (A) reacts with concentrated H₂SO₄ at 413K to give DIMETHYL ether (B).2C2H5-OH --> C2H5-O-C2H5 + H2OEthanol (A) reacts with concentrated H₂SO₄ at 443K to give ethene (C).C2H5-OH --> CH2=CH2 + H2OEthene (C) reacts with bromine water to form ethyl dibromide which is colourless.CH2=CH2 + Br2 --> Br-CH2-CH2-BrThanks dear... |
|
| 35. |
What is the product formed when Ethanol is heated with excess concentrated H₂SO₄ at 443K, and What happens when this gas is passed through bromine water? |
| Answer» FIRSTLY H2SO4 is BREAK down at 443K and after that it teact with the ETHANOL | |
| 36. |
Homologous series predict the properties of the members of the series.Justify this statement through its characteristics. |
|
Answer» tion:A Homologous SERIES is a group of organic chemical compounds, usually listed in order of increasing size, that have a similar structure (and hence also similar properties) and whose structures differ only by the number of CH2 units in the main carbon chain.The simplest example of a homologous series in organic chemistry is that of ALKANES (as TAUGHT for UK GCSE Chemistry, to ages approx 14-16 yrs). Alkanes consist of carbon and hydrogen atoms only, in proportions according to the general formula:CnH2n+2where the letter n represents the number of carbon atoms in each molecule of the compound. Hence the first 10 molecules in the homologous series of linear alkanes are:Example of the Homologous Series of Alkanes, Structure: CnH2n+2Methane ( 1 carbon atom in chain )CH4Methane (Alkane)Ethane ( 2 carbon atoms in chain )C2H6Ethane (Alkane)Propane ( 3 carbon atoms in chain )C3H8Propane (Alkane)As can be seen in the case of the example of the homologous series of alkanes (above), the basic MOLECULAR structure of all members of the series takes the same form. The DIFFERENCE between members of the homologous series depends on the value of n, which represents the number of carbon atoms in the chain.The homologous series of alkanes is the simplest and probably most often cited example but there are many other homologous series of organic compounds.I hope it help you...... |
|
| 37. |
It is a clear liquid with a burning taste. (State whether it fits for ethanol or ethanoic acid). |
| Answer» | |
| 38. |
An organic compound (A) of molecular formula C₂H₆O on oxidation with alkaline KMnO4 solution gives an acid (B) with the same number of carbon atoms. Compound A is used as an antiseptic to sterilize wounds, in hospitals. Identify A and B. Write the chemical equation involved in the formation of B from A. |
|
Answer» Hey Guys!!!! COMPOUND.A: ETHANOL (ethyl alcohol) Compound B: Ethanoic acid C2H5OH give CH3COOHHope it may help you and please please please please mark it as BRAINLIST ANSWER |
|
| 39. |
Assertion: Due to catenation a large number of carbon compounds are formed.Reason: Carbon compounds show the property of allotropy.Does the reason hold good for the given Assertion? |
| Answer» ASSERTION : True Reason : ImproperExplanation:Catenation REFERS to the ability of an ELEMENT to form long chains. While Allotropy is an entirely different concept; it refers to the natural existence of an element in different forms, i.e. bonded differently. solid CARBON exists in the forms of diamond and graphiteEach carbon is identical, they all have four valence electrons, so they can easily bond with other carbon atoms to form long chains or rings. A carbon atom can bond with another carbon atom two or three times to make double and triple COVALENT bonds between two carbon atomsand Hence can form long chains. | |
| 40. |
Assertion: Diamond is the hardest crystalline form of carbon.Reason: Carbon atoms in diamond are tetrahedral in nature (Verify the suitability ofreason to the given Assertion mentioned above) |
|
Answer» As we know that , it is a hardest CRYSTALLINE FORM of CARBON. So , DUE to its shape layering between carbon it become hardest crystalline form of carbon |
|
| 41. |
The S.I. unit of thurst isa) newtonb) N m^-1 c) N md) pascal |
|
Answer» because upthurstis a FORCE |
|
| 42. |
Ohm means what,what is meant by ohm? |
|
Answer» the UNIT for MEASURING ELECTRICAL RESISTANCE. |
|
| 43. |
Explain the construction and working the following draw net diagram and label it electric motor in points |
|
Answer» tion:CONSTRUCTION AND ITS MAIN PARTS :The main part of electric MOTOR :1 the armature coil ABCD mounted on axle .2 the split part S1 and S2 of ring that is copper split ring being divides into two parts S1 and S2 which is KNOWN as split ring commutator .3. a pair of carbon process B1 and B2 4. A horseshoe electromagnet 5 D.c source WORKING :When KEY is CLOSED the current flow in the coil in the direction ABCD .key is closed the current flow in the coil in the direction ABCD .The current in ARM BC and BA is parallel to the magnetic FIELD so these are experience no force the current in a b and CD is perpendicular to magnetic field so each arm experience a force Thank you |
|
| 44. |
What is parallax method??? |
|
Answer» Astronomers ESTIMATE the distance of nearby objects in space by using a method called STELLAR parallax, or trigonometric parallax. Simply put, they MEASURE a star's APPARENT movement against the background of more distant stars as Earth revolves around the SUN. |
|
| 45. |
Define mean percentage error |
| Answer» ISTICS, the mean percentage ERROR (MPE) is the computed average of percentage errors by which forecasts of a MODEL DIFFER from actual values of the quantity being forecast. | |
| 46. |
Presbyopia eye defect and the lenses used for correct them |
|
Answer» ⚔Presbyopia Explanation:↪It is an defect of vision. It is INABILITY to see clearly objects that are near due to the ageing of ciliary muscle is REFFERED as presbyopia.We can say that presbyopia is the condition of hypermetropia due to ageing.✒Presbyopia can be corrected using a bi-focal lens.Note this lens will be USED in CASE of myopia as WELL as hypermetropia. |
|
| 47. |
Six equal forces act on abody simultaneously. The magnitude of each force is 20N. The angle between any two succesive forces is 60°. The resultant is |
| Answer» PLZZ SEND the PICTURE of QUESTIONS... | |
| 48. |
Identify the pair, whose dimensions are equal:(A) Torque and work (B) Stress and energy(C) Force and stress (D) Force and work |
|
Answer» udent,◆ Answer -(A) TORQUE and work● EXPLANATION -Torque is calculated as -Torque = FORCE × PERPENDICULAR distanceDimensions of torque are -[Torque] = [Force] × [Perpendicular distance][Torque] = [L1M1T-2] × [L][Torque] = [L2M1T-2]Work is calculated as -Work = Force . DisplacementHence, dimensions of work are -[Work] = [Force] . [Displacement][Work] = [L1M1T-2] . [L][Work] = [L2M1T-2]Hence,[Torque] = [Work]HOPE this helps you... |
|
| 49. |
A silvery white metal on treatment with NaOH and HCl liberates H₂ gas to form B and C respectively. The metal A will not react with acid D due to the formation of a passive film on the surface. Hence it is used for transporting acid D. Identify A, B, C, D and support your answer with balanced equations. |
| Answer» | |
| 50. |
Dimensional equation for temperature gradient is(A) [M¹L⁰T¹K⁰] (B) [M⁰L¹T⁰K¹](C) [M⁰L⁻¹T⁰K⁻¹] (D) [M⁰L⁻¹T⁰K¹] |
| Answer» DIMENSIONAL formula for TEMPERATURE gradient is [ML^{-1}T^0 K^1] | |