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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. |
• A chemical equation is a statement that describes the chemical change in terms of: (a) Symbols and formula (b) energy (c) colour (d) number of atoms |
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Answer» so2 +H20 = H2So3.SEE the above picture.Ca(OH)2 + CO2 = CaCO3 + H2O (WHITE colour change)see the natural GAS example. |
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| 2. |
Arrange the following speeds in increasing order i]an athelete running with a speed of 10m/s. ii]a bicycle moving with a speed of 200m/min. iii]an scooter moving with a speed of 30km/h. |
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Answer» I don't KNOW the ANSWER for this QUESTION and you ALSO don't know the answer for this question ..... |
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| 3. |
The ____________ of a screw is the distance moved along its axis by the screw in one complete rotation of its head. * |
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Answer» The pitch of a screw is the DISTANCE moved along its AXIS by the screw in one complete rotation of its headPlease mark my answer as brainlist PLEASE |
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| 4. |
मान लीजिए कि एक काले रंग का भालू 30 फीट की ऊंचाई पर बैठा है और वह वहां से कूद जाता है। फर का रंग आपको क्या दिखाई देना चाहिए और क्यों? |
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Answer» इसके दो जवाब हो सकते हैं 1 भालू जब कूदेगा तो उसका फर के बाल ऊपर हो जायेंगे तो हमे उसके फर का रंग हल्का सा हमारी SKIN जैसा लगेगा2 भालुओ का फर उनकी skin से बहुत कसके चिपका होता है तो हमें वह वैसा ही दिखेगा |
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| 5. |
The wave length of light of a particular colour is 4200A°. Express it in metre. * |
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| 6. |
Write a relarionship between the mechanical advanrage and velocity ratio of ideal machine |
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Answer» Velocity ratio of simple machine is the ratio of distance TRAVELLED by the effort to the distance travelled by theload in the machine. As velocity ratio or ideal MECHANICAL advantage is a simple ratio of TWO distances, it ALSO does not have the unit. The friction is not involved in it.Explanation: MARK ME AS THE BRAINLIEST |
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| 7. |
PQRS is a rectangle with angle PQS = 50°. Determite angle SQR |
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| 8. |
A car ismovingtowards cast at 40km/h and atrain is moving towards north at 30 km / h Findrelative velocity oftrain as seenby pessenger in thecar |
| Answer» RELATIVE VELOCITY= 70km/h | |
| 9. |
D) school bags are provided with wide straps to carry them. |
| Answer» TION:School bags are provided with large wide straps to carry them because it increases the SURFACE area in contact with the SHOULDER and reduce the pressure of the shoulder of the students shoulder..please MAKE my answer as brainliest | |
| 10. |
5. A car moves with a speed of 30 km/h for half an hour, 25 km/h for one hour and 40 km/h for two hours. Calculate the average speed of the car. |
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Answer» [ ᴀᴠᴇʀᴀɢᴇ sᴘᴇᴇᴅ = ᴛᴏᴛᴀʟ ᴅɪsᴛᴀɴᴄᴇ ᴛʀᴀᴠᴇʟʟᴇᴅ / ᴛᴏᴛᴀʟ ᴛɪᴍᴇ ᴛᴀᴋᴇɴ]ᴀᴠᴇʀᴀɢᴇ sᴘᴇᴇᴅ = 30ᴋᴍ + 25ᴋᴍ + 40ᴋᴍ / 1 /2ʜʀ + 1ʜʀ + 2ʜʀ = 95ᴋᴍ / 2+2+4/2ʜʀ = 190ᴋᴍ/8ʜʀ = 23.75ᴋᴍ/ʜʀʜᴏᴘᴇ Ɪᴛ ʜᴇʟᴘS |
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| 11. |
Give an example when distance and displacement are equal? |
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Answer» When the OBJECT is moving in a straight line distance will be equal to displacement. For example an object STARTS from rest and moves 20 m north. Distance is the FULL PATH covered by the object so distance covered by object will be 20 m. Displacement is the shortest path covered by the object.Explanation:Please mark me as a brain list |
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| 12. |
Two equal and opposite charges of magnitude 2X10^-7 C are 15 cm the direction of the resultant electric intensity E at a point midway between the charge . * towards the –ve charge insuffiecient data towards the +ve charge none |
| Answer» TOWARDS -ve CHARGE BCOZ +ve charge E AWAY from it and -ve charge E towards itself. | |
| 13. |
For a lever of first order , derive expressions for → i) mechanical advantage ii) velocity ratioiii) efficiency |
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Answer» My ANSWER is MECHANICAL advantageExplanation:HOPE it will HELP you |
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| 14. |
The minimum field required to produce breakdown of air is 3 X 10^6 V / m. Therefore a conducting sphere 10 cm in radius can easily hold a charge of 4X 10^-6 C in air without breakdown. * True False |
| Answer» TION:i THINK FALSE ............ | |
| 15. |
Plz plz help me......................... |
| Answer» SORRY...............................................………………………… | |
| 16. |
The massea of the earth and moon are 6×10²⁴kg and 7.4×10²² kg , respectively. The distance between them is 3.84×5km. calculate the gravitational force of attraction between the two. (G=6.7×10-¹¹) |
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| 17. |
A particle is thrown at angle θ to cover maximum range with kinetic energy ‘K’. What is its energy at the highest point? |
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Answer» Kinetic energy K, LET VELOCITY of particle ISV. ⇒v=m2K⇒ 21mv2= KVelocity in horizontal direction=vcos(θ)=m2Kcos(θ)Velocity in vertical direction=vsin(θ)=m2Ksin(θ)At highest point, Vertical velocity is ZERO only CONSTANT horizontal velocity is present.Kinetic energy at highest point =21m(vcos(θ))2=21×m×m2Kcos2(θ)=Kcos2(θ) |
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| 18. |
In the above attached problem why pi r is taken |
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Answer» t simply says wheel TAKES a half a revolution. Which means we have to calculate the half of circumference of circle and HENCE we need pi() in the FORMULA for finding circumference of circle.~Pls atlest mark my answer as BRAINLIEST if you think I really HELPED you. |
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| 19. |
It's urgent The refractive index of diamond is 2.42”. What is the meaning of this statement in relation to speed of light? |
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Answer» The refractive INDEX of diamond is 2.42. This means that the SPEED of light in diamond will REDUCE by a FACTOR of 2.42 as COMPARED to its speed in air. In other words, the speed of light in diamond is 1/2.42 times the speed of light in vacuum. |
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| 20. |
give me Ex 1 object has potential not kinetic energy 2 has K.E not P.E 3 has both K.E and P.E 4 nor p.E not K.E |
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Answer» 1.A BALL on the TOP of a BUILDING2. A FALLING ball just before TOUCHING the ground.3.A falling ball. |
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| 21. |
Explain why do wire cutters gives gain in force |
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Answer» as the BLADES sink DEEPER into the wire the area of contact will increase and as pressure is force DIVIDED by contact area that will make the pressure decrease.may this helpful..please MARK it BRAINLIEST |
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| 22. |
A If the sum of the torques on an object in equilibrium is zero about a certain point, it is |
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| 23. |
Obtain an expression for the workdone by a variable force acting On a particle directed along X axis |
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Answer» The work done by a constant FORCE of magnitude F on a point that moves a displacement d in the direction of the force is the product: W = Fd.Integration approach can be used both to calculate work done by a VARIABLE force and work done by a constant force.The SI unit of work is the joule; non- SI units of work include the erg, the foot-pound, the foot-poundal, the kilowatt hour, the litre-atmosphere, and the horsepower-hour.Key Termswork: A measure of energy expended in moving an object; most commonly, force times displacement. No work is done if the object does not move.force: A physical quantity that denotes ability to push, pull, twist or accelerate a body, which is measured in a unit dimensioned in mass × distance/time² (ML/T²): SI: newton (N); CGS: dyne (dyn)Explanation:hope its HELP U |
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| 24. |
3. She has a very .... (burn) remains of the paper held all4. The .....the clues.artists |
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Answer» 3. She has a very BURNED REMAINS of the PAPER HELD all. 4. The painting the CLUES artists. |
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| 25. |
What is reference point or origin? |
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Answer» In three dimensional coordinate system, the point of intersection of three AXES(x, y and Z AXIS) i.e Origin is considered as the reference point. The position of an object is TAKEN as the distance of the object from the origin.please mark me as brainliest |
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| 26. |
Four charges + 8Q, - 3Q +5Q and -10Q are kept inside a closed surface. What will be the outgoing flux through the surface. * 2 points 26 V-m 0 V-m 10 V-m 8 V-m |
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Answer» We KNOW that flux = TOTAL charge ENCLOSED / EOSO, = 8-3+5-10/Eo = 10-10/Eo => 0 Thank you |
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| 27. |
What do you mean by body at rest?Give example of it. |
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Answer» it MEANS for a STATIONARY OBJECT which isn't SHOWING any motion.ex,a HOUSE |
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| 28. |
What do you mean by a body in motion?Give one example of it. |
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| 29. |
two like charges when placed in a medium of dielectric constant of2.5 at adistance of 10 cm repel each other with a force of 1 N.find the force between them when placed5cm apart in air |
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Answer» o like CHARGES when placed in a medium of dielectric constant of 2.5 at a distance of 0.1 m repel each other with a force of 1 N.To Find The force between them when they are placed 0.05 m apart in AIR.Working formulaForce between charge particles placed in air Where, K = and R is the distance between the charged particles.Force between charge particles placed in a dielectric mediumHere, if the distance between the particles is r, we USE the same formula as that of air ,but the new distance is given as is the dielectric constant of the medium.Calculations0.1 m distance in a dielectric medium of constant 2.5 gives a distance m distance in air.Hence,when placed 0.5 m apart , force = 1 N. Thus, we have to find force when they are placed 0.05 m apart.Hence, the force when they are placed in air is 100 N |
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| 31. |
Give an example where two equal and opposite forces do not form an action reaction pair |
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Answer» people push and pull a door from opposite forces . EXAMPLES of TWO equal and opposite forces do not form an action - reaction pair : 1) When two teams are playing TUG of war and both teams are applying exactly same amount of forces from two SIDES ,then the rope will stay stationary and no action will happen. |
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| 32. |
A car starting from rest with acceleration 2m/s². If its final velocity is 20m/s², find its displacement |
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Answer» Explanation:Correct Question,A CAR starting from rest with acceleration 2 m/s².If its final velocity is 20 m/s, FIND its DISPLACEMENT .Solution,Here, we haveInitial velocity of car, u = 0 m/s (As car starts from rest)Final velocity of car, v = 20 m/sAcceleration by car, a = 2 m/s²To Calculate,Displacement by car = ??At, we will find time taken, tAccording to 1st law of motion,we know that,v = u + atSo, putting the values, we get⇒ v = u + at⇒ 20 = 0 + 2 × t⇒ 20 = 2t⇒ 20/2 = t⇒ t = 10 Now, displacement,We know that,Displacement = velocity × time⇒ Displacement = 20 × 10⇒ Displacement = 200 m.Hence, the displacement by car is 200 m. |
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| 33. |
B. Two parallel rail tracks run north-south. Train A moves north with a speed of 54 km/hr and train B moves south with speed of 90 km/hr.What is the velocity of ground with respect to B? |
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Answer» a velocity of a monkey running on the roof of the TRAIN A against its motion (with its velocity of 18 kmh−1 with respect to the train A) as OBSERVED by a man standing on the. Hence, velocity of train B w.r.t train A is 144 km/h toward south. Hence, velocity of GROUND w.r.t train B is 90 km/h towards north.Explanation:please mark me as branliest |
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| 34. |
112 An object is is placed at distance of 30 cm in frontof a cane mirror of focal lenght isom. Write fourcharacteristics of umage formed by to themurmon |
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Answer» imageisalwayserectimage isalwaysvirtualsmallinsizealways FORM BEHIND the MIRROR |
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| 35. |
The distance of centre of mass of uniform circular disc of radius R, from the geometric centre on the axis of symmetry is |
| Answer» OU have to need to me the FACT that the centre of MAN of an uniform semi-circular circular ring of radius r lies at a vertical distance of place on π2R axis on the centre. By symmetry the x− coordinate of centre of man is =0x un =0Now, we have to need to be certain things to find Y un . At a vertical distance Y from the ORIGIN imagine U infinite i mal disk with a thickness =dRThe area of that infiniteterimal disk is dA=πRdRlet's find out it's mass,⇒dm=6dA=πRdR×CR 2 =πCR 3 dR.Y r is the position of the centroid of that dR ring and it equals = π2R . | |
| 36. |
Write an experiment to show how to measure the bouyancy experiment by abody in a liquid |
| Answer» TION:HOPE it help.make it BRAINLIST ANSWER. | |
| 37. |
The amount of heat required to rise the temperature of 100 gm water from 30 °Cto 80 °C is (S = 1 cal/gm K) |
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Answer» Explanation:USE, Q=Mc delta T, mass=100gm,,delta T=50°., c=1cal/gm KSO, Q=100 X 1 x 50== 5000 cal. |
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| 38. |
How much work is done in moving a charge of 2 C across two points having a potential difference 12 V? |
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Answer» Work is done in moving a charge of 2 coulomb across two points having a potential difference of 12 volt is 24 joule FormulaW = qVWhere Q is charge , W is the workdone and V is the ponential difference .As givenwork is done in moving a charge of 2 coulomb across two points having a potential difference of 12 volt .q = 2 coulombV = 12 voltPut all the values in the formulaW = 2 × 12W = 24 jouleTherefore the work is done in moving a charge of 2 coulomb across two points having a potential difference of 12 volt is 24 joule . |
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| 39. |
A spherical mirror produces a magnification of -1 on a screen placed at a distance of 50cm from the mirror. (i) Write the type of the mirror. (ii) Find the distance of the image from the object. (iii) What is the focal length of the mirror? (iv) Draw the ray diagram to show the image formation in this case. |
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Answer» this is your ANSWEREXPLANATION: PLEASE MARK as the BRAINLIST |
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| 40. |
Starting from the rest with acceleration 10m/s² , find the velocity after 20m |
| Answer» U = 0 (as body was on the REST)V = ?a = 10m/s²t = 20M = 20×60s = 1200sNow, First eqn of MOTION v = u + atv = 0 + (10m/s² × 1200s)v = 12000m/s | |
| 42. |
Which are the forces experiment by a body placed in a liquid |
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Answer» it is BUOYANCY buoyancy is the FORCE ACTED on WATER it is GIVEN by archimedies |
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| 43. |
And away pomе.4) A spherical conductor of radius 18cm has aCharge of 1. 6x108distributed uniformlyits surfacewhat is the electric field(a) Inside the sphere16 Just outside the Sphere(c) At a point 24cm from the centre of Sphere |
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| 44. |
class 10th science chapter -reflection and refraction...... plz mujhe ncert book ke phle 2 pages ke pics chahiye plz send me its aurgent.... |
| Answer» OK DUDE why not....XD.... | |
| 46. |
A +25 point charge is placed at the origin. Calculate the magnitude of the electric field produced by the point charge 75cm to the right. What is the magnitude and direction of the force exerted by this field on a test charge +20 and -20'.placed at this point? |
| Answer» SRRY i don't KNOW what is ANSWER | |
| 47. |
2. Also covering velocity vector addition Ex. You are in a truck traveling 12 m/s [S] when you decide to throw out your trash in a can that is 9 m [E] of you. a) What is the velocity of the garbage if you throw it 8 m/s [E]? b) How far South do you miss the can by c) What direction should you have thrown the garbage? d) With this angle how long until it goes in? |
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Answer» the ANSWER is above..... |
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| 48. |
)Find the distance from 4q where a third charge can remain in equilibrium.pls ans |
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Answer» Hy dude UR ANSWER isExplanation:Let"r" be the distance from the charge Q where Q is in equilibrium .Total Force acting on Charge q and 4Q:F=kqQ/r² + k4qQ/(l-r)²For Q to be in equilibrium , F should be equated to zero.kqQ/r² + k4qQ/(l-r)²=0(l-r)²=4r²⇒l-r=2r⇒l=3r⇒r=l/3Taking the third charge to be -Q (say) and then on APPLYING the condition of equilibrium on + q chargekQ/(L/3)² =k(4q)/L²9kQ/L²=4kq/L²9Q=4qQ=4q/9Therefore a point charge -4q/9 should be placed at a distance of L/3 rightwards from the point charge +q on the line joining the 2 charges.✔Hơ℘ɛ ıɬ ɧɛƖ℘ʂ!!✔✌Mąཞƙ ɱɛ ąʂ ცཞąıŋƖıɛʂɬ☞Hıɬ ąŋɖ Ɩıƙɛ ɱყ ąŋʂῳɛཞ ąŋɖ ɖơŋ'ɬ ʄơཞɠɛɬ ɬơ ʄơƖƖơῳ ɱɛ☜ |
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| 49. |
A 5.0V stabilized power supply is required from a 12V dc input. The maximum power rating of the zener diode is 2W. Find the maximum current flowing in the zener diode |
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Answer» hy dude ur ANSWER isExplanation:plz INCREASE the POINTS then U can FIND the answer of this question |
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| 50. |
What is the total charge on 75kg electrons. |
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Answer» q is the CHARGE in coulomb, n is the number of electrons and e is a charge of single electron (QUANTUM charge) . 1 electron has a mass of 9.1 * 10^-31 KG . Then 75kgs of electron has has 8.24 * 10^31 electrons roughly. q=1.31*10^13 C and that's a lot of charge.Explanation:here's the ANSWER please follow me |
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