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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 person is holding a mirror in his hand to burn a piece of paper a) identify the mirror b) the paper begin to burn producing smoke where should we place the paper in front of a mirror for this to happen |
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Answer» a) CONVEX mirror b) the mirror should be kept under the SUN POINTING in one PERFECT tip on the paper..HOPE THIS HELPS!!! |
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| 3. |
the angle between mirror and the incident ray is 30 degree a) what is the angle of reflection B)what is the total angle through which Ray of light turns |
| Answer» LE of Reflection is always EQUAL to the Angle of Incidence. Hence, the angle of reflection is 30 degrees.(B) The TOTAL angle by which the RAY turns back is equal to the sum the angle of incidence and reflection. Hence, 60 degrees is the total angle through which the ray of light turns back.Hope it helps... | |
| 4. |
A particle is executing SHM with an amplitude 4 cm the displacement at its energy is half Kinetic and half potential |
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Answer» with an AMPLITUDE 4 cm. the displacment at which its ENERGY is HALF kinetic and half ... Potential energy =Kinetic energy ... The displacement of the particle. |
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| 5. |
Ablock of mass 2kg fall freely from rest through adistance of 3m. Find the kinetic energy of the block? |
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Answer» The kinetic energy of the block is 58.8 JExplanation:m = 2 kgS = 3 MU = 0 m/s (the BODY is INITIALLY at rest)a = 9.8 m/ (acceleration due to gravity)From the third law of motion : = 2 X 9.8 x 3 = 58.8 K.E. = 1/2 m = 1/2 x 2 x 58.8 = 58.8 J |
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| 6. |
In pond a flame at 2m and depth 4m and refractive index is 4/3. Then apparent height is |
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Answer» Given : H1 = 2 m h2 = 4 m nw = 4/3 N1 = 1 Apparent HEIGHT of flame as seen by ... The refractive index of water is 4/3 |
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| 7. |
Density, volume, area, shape which one is odd with reason for the answer |
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Answer» hey MATE here is U r answer the correct answer is shape Explanation:Bcz DENSITY, volume, AREA has own formula and shape has doesn't having any formula Plz mark me as a Brainlist |
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| 8. |
a person needs a lens of power -4.5 diopter a) he is suffering from which sightedness b) what is the focal length of the lens used to overcome the problem c) what are the properties of the lens used |
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Answer» a . Myopiab. 2 / 9 c . diverging , forms VIRTUAL & ERECT .Explanation:f = 1 / P f = 1 / 4.5 f = 2 / 9 . |
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| 9. |
What is meant by statement iron is denser than wood |
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| 10. |
9. Water is allowed to flow through a capillary tube of length 10cm and diameter 2 mm undera constant pressure difference of 6.5 cm ofwater level. If 0.16 litres of water flows in1 minute, its coefficient of viscosity is,1) 0.00937 poise2) 0.0937 poise3) 0.000937 poise 4) 0.937 poise |
| Answer» WATER is allowed to flow through a capillarytube of length 10cm and DIAMETER 2 mm undera constant pressure difference of 6.5 cm ofwater level. If 0.16 litres of water flows in1 minute, its COEFFICIENT of viscosity is,1) 0.00937 poise2) 0.0937 poiseExplanation:220 N/m(2) 110 N/m(3) 45 N/m(4) 440 N/mone limb is 3.0 mm and that of the other is 6.00 mm. The tubeis inverted vertically with the open ends below the surface ofwater in a BEAKER. What is the difference between the heightsto which water rises in the two limbs ? Surface tension ofwater is 0.07 Nm. Assume that the ANGLE of contact | |
| 11. |
Two spherical bobs, one metallic and the other of glass, of the same size are allowed to fall freely from the same height above the ground. Which of the two would reach earlier and why? [Delhi 2014] |
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Answer» Explanation:MARK MY ANSWER AS BRANLIEST A glass bob is non-conducting, while a metallic bob is conducting. Due to the non-conducting nature of the glass bob it will only experience the Earth's gravitational pull. So, the glass bob will reach the GROUND earlier. Because of its conducting nature. Eddy CURRENT is induced in the metallic bob as it falls through the magnetic field of the Earth. By LENZ's law, the current induced is such that it opposes the motion of the metallic bob. So, the metallic bob will experience a force in the upward direction. This will slow down the metallic bob by some extent. Hence, it will reach the Earth after the glass bob. |
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| 12. |
A closed loop is held stationary in the magnetic field between the north and south poles of two permanent magnets held fixed. Can we hope to generate current in the loop by using very strong magnets? |
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Answer» The electricity get generated due to the phenomenon of electromagnetic induction. This happen due to changing of magnetic FORCE by changing the position of MAGNET but in this CASE magnet is held STATIONARY. So no electricity is generated.NO. |
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| 13. |
Give the direction in which the induced current flows in the coil mounted on an insulating stand when a bar magnet is quickly moved along the axis of the coil from one side to the other as show in the figure. |
| Answer» TION:(i) If SEEN from the RIGHT hand side, current flows clockwise when South-pole moves towards the COIL. (ii) If seen from the left hand side, current flows clockwise when N-pole of the BAR magnet moves away from the coil. | |
| 14. |
The electric current flowing in a wire in the direction from B to A is decreasing. Find out the direction of the induced current in the metallic loop kept above the wire as shown. [AI 2014] |
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Answer» The direction of current induced is such that it OPPOSES the DECREASE of MAGNETIC field. So, the magnetic field induced due to current carrying wire is downward and the direction of current in the LOOP is clockwise according to the Lenz's law.please mark as brainlest answer |
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| 15. |
A long straight current carrying wire passes normally through the centre of circular loop. If the current through the wire increases, will there be an induced emf in the loop? Justify. [Delhi 2017] |
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Answer» tion:hope this will HELP you... if you will satisfy with my ANSWER then please mark my answer as brainlist and THANKED my answers |
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| 16. |
A circular loop is moved through the region of uniform magnetic field. Find the direction of induced current (clock wise or antic lock wise) when the loop moves (i) into the e field, and (ii) out of the field. [Foreign 2010] |
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Answer» e... here is your answer :-====================(I) anticlockwise (ii) clockwise HOPE this will help you... if you will satisfy with my answer then PLEASE MARK my answer as brainlist and THANKED my ANSWERS |
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| 17. |
A closed loop moves normal to the constant electric field between the plates of a large capacitor. Is a current induced in the loop (i) when it is wholly inside the region between the capacitor plates, and (ii) when it is partially outside the plates of the capacitor? The electric field is normal to the plane of the loop. |
| Answer» ANSWER is in the imagehope it's HELPFUL to YOUPLEASE MARK as BRAINLEST answer | |
| 18. |
A washing machine of power 2000W works for 1 hour daily. If the cost of per unit is Rs.4, calculate the cost of energy for a week? |
| Answer» TION:hpoe it HELPTHIS is your ANSWER | |
| 19. |
Find effective resistance |
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Answer» R1+R2 = 1+1 =2 ohm is effective resistancehope it will be helpful for youPlz PLZ MARK as brainliest!!! |
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| 20. |
time period of a pendulum is 2 second and length is 100 cm find the acceleration due to gravity by using formula of its time period |
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Answer» n surface of MOON, acceleration due to GRAVITY is g/6. Time period of seconds pendulum on earth is 2 seconds. On Earth, 2=2π gl On moon,T moon =2π 6g l DIVIDING the above two equations, we get, T moon =2 6 |
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| 21. |
Which planet spins like a spinning top?? |
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| 22. |
In series-shunt feedback amplifier,the sampling elements is |
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Answer» Series-Shunt Configuration – Voltage in and Voltage out or Voltage CONTROLLED Voltage Source (VCVS).Shunt-Shunt Configuration – Current in and Voltage out or Current Controlled Voltage Source (CCVS).Series-Series Configuration – Voltage in and Current out or Voltage Controlled Current Source (VCCS).Shunt-Series Configuration – Current in and Current out or Current Controlled Current Source (CCCS).These names come from the way that the feedback NETWORK connects between the input and OUTPUT stages as shown.Shunt-Series Feedback, also known as shunt current feedback, operates as a current-current controlled feedback system. The feedback signal is proportional to the output current, Io flowing in the load. The feedback signal is fed BACK in parallel or shunt with the input as shown. |
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| 23. |
How many inputs are there in feedback amplifier? |
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Answer» TO MY KNOWLEDGEElectronic amplifiers USE CURRENT or VOLTAGE as input and output, so four types of AMPLIFIER are POSSIBLE of WHICH two possible inputs with any of two possible outputsExplanation: |
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| 25. |
A piece of iron of mass 500 gram has a volume of 64 cmº. Calculate the density of iron. |
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Answer» 500gVolume = 64cm³Density = Mass/Volume = 500/64 = 7.8125g/cm³Hope this is helpful to YOUPLS MARK as BRAINLIESTFOLLOW me and I'll FOLLOW you back |
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| 26. |
ise returns 2400 times per minute how many times does it earn in one second please answer this question step by step |
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Answer» 400 rpsExplanation:24000 REVS/minute -> change minute to seconds, as 1 min = 60 seconds24000 revs/ 60 seconds -> DIVIDE 24000 by 60 = 400400 revs/secondSo 24000 rpm=400 RPS |
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| 27. |
If y = (3x + 2) (2x + 3) then dy/dx |
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Answer» tion: y = 6x² + 9X + 4x + 6 y = 6x² + 13X + 6 D . w . r . to . x dy/dx = 6(2x) + 13 + 0 = 12x + 13 |
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| 28. |
How is the resistance of a wire affected if a) Its length is doubled b) Its area is doubled c) Its radius is doubled |
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Answer» tion:resistance= rho X length/area of cross-sectionso, resistance is directly proportional to length and if the length is DOUBLED the resistance gets doubled as wellb) resistance is inversely proportional to the area of cross-section so if area is doubled, the resistance is HALVEDC) R1=¶ l/2πr1 R2=¶ X l/2π2r1or, R2=¶X l/4πr1or, R2=(1/2)X R1 |
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| 29. |
A bulb is marked 60w and 12v . Find its resistance |
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Answer» Resistance of the BULB = 2.4 OhmExplanation:EQUATION for power: P = /RP = 60 WV = 12 VR = / P = 144 /60 = 2.4 Ohm |
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| 30. |
On a certain day the air temperature is 17.7°C and the dew point is 5.3°C. Find the relative humidity. (SVP al5°C, 6°C, 17°C, and 18°C are 0.654 cm, 0.705 cm1.442 cm and 1.546 cm respectively) |
| Answer» TION:what we do in these QUESTION PLEASE TELL me | |
| 31. |
Phenomenon of production of induced emf due to change of magnetic flux linked with a closed circuit is known as _________ . |
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Answer» Electromagnetic induction Explanation:The phenomenon of producing an emf in a CIRCUIT whenever the magnetic flux linked with a coil changes is electromagnetic induction. Electromagnetic induction is the production of an electromotive force (i.e., voltage) ACROSS an electrical conductor due to its dynamic interaction with a magnetic field. It has found MANY applications in technology, including electrical components such as inductors and TRANSFORMERS, and devices such as electric motors and generators.Hope it helps you dude. If so please tag me as brainliest.Have a GREAT day . |
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| 32. |
An e.m.f is produced in a coil, which is not connected to an external voltage source. This is not due to (a) the coil being in a time varying magnetic field. (b) the coil moving in a time varying magnetic field. (c) the coil moving in a constant magnetic field. (d) the coil is stationary in external spatially varying magnetic field, which does not change with time. |
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Answer» An EMF is produced in a coil, which is not CONNECTED to an external voltage source. This can be due to (a) the coil being in a time VARYING magnetic field Explanation:May this ANSWER will HELP you plz MARK has brainliest |
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| 33. |
A cylindrical bar magnet is rotated about its axis (Figure). A wire is connected from the axis and is made to touch the cylindrical surface through a contact. Then [NCERT Exemplar] (a) a direct current flows in the ammeter A. (b) no current flows through the ammeter A. (c) an alternating sinusoidal current flows through the ammeter A with a time period T = \frac{2 \pi}{\omega} (d) a time varying non-sinosoidal current flows through the ammeter. |
| Answer» LOW me and VOTE here. | |
| 34. |
Relation between S.I. unit and C.G.S. unit of magnetic flux is _________ . |
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Answer» ll = WEBER ✨✨ |
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| 35. |
Same as question 4 except the coil A is made to rotate about a vertical axis (Figure). No current flows in B if A is at rest. The current in coil A, when the current in B (at t = 0) is counterclockwise and the coil A is as shown at this instant, t = 0, is [NCERT Exemplar] (a) constant current clockwise. (b) varying current clockwise. (c) varying current counterclockwise. (d) constant current counterclockwise. |
| Answer» TION:the ANSWER of U R QUESTION is option.A | |
| 36. |
A loop, made of straight edges has six comers at A(0, 0, 0), B(L, 0, 0) C(L, L, 0), D(0, L, 0), E(0, L, L) and F(0,0, L). A magnetic field B = Bo (\hat{i}+\hat{k})T is present in the region. The flux passing through the loop ABCDEFA (in that order) is [NCERT Exemplar] (a) BoL² Wb. (b) 2BoL² Wb. (c) √2BoL² Wb. (d) 4BoL² Wb. |
| Answer» SORRY I didn't KNOW that the ANSWER of this QUESTION | |
| 37. |
When the rate of change oic current is unity, the induced emf is equal to (a) thickness of coil (b) number of turns in coil (c) coefficient of self inductance (d) total flux linked with coil |
| Answer» HOPE this HELPS you out | |
| 38. |
Total number of magnetic lines of force crossing a surface normally is called _________ . |
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Answer» helloExplanation: The measurement of the total MAGNETIC field that passes through a given AREA is known as magnetic flux. It is helpful in DESCRIBING the effects of the magnetic force on SOMETHING occupying a given area. |
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| 39. |
distance between two object is 24 cm find where to place convex lens so that image of both objects are formed at the same position which is 18 cm from lens |
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Answer» )448orruprreorlpExplanation:lhryxcf osyysstsssldyid jjgg jjgg ZHC |
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| 40. |
a car accelerates from standing start and reaches a velocity if 18m/s after 6 seconds. calculate its acceleration |
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Answer» ar STARTS from rest. Final velocity of car = 18 m/s Time = 6 seconds.To find ACCELERATION of car after 6 seconds.SolutionAs here, the car starts from rest so the initial velocity of car will be 0.⇒ Initial velocity (u) = 0 m/s⇒ Final velocity (v) = 18 m/s⇒ Time (t) = 6 seconds.Equation of motion used :⇒ a = (v - u)/tPutting VALUES here :⇒ a = (18 - 0)/6⇒ a = 18/6⇒ a = 3 m/s²Therefore,Acceleration of car = 3 m/s²____________________Additional informations :Derivation of the equation [a = (v - u)/t] :We KNOW equation of motion :⇒ v = u + at⇒ at = v - u⇒ a = (v - u)/tMore equations of motion :⇾ v² - u² = 2as⇾ s = ut + ½ at²⇾ v - u = at |
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| 41. |
A ball is projected horizontally from top of a building with certain velocity. It’s horizontal range is 20m. Now the same ball is projected horizontally from top of a building of the same height, but on a different planet who’s acceleration due to gravity is 1/4th that of earth. Find its horizontal range. |
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Answer» I can't UNDERSTAND why U ASKED |
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| 42. |
Explain heat conductivity with diagram |
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Answer» tion:In metals, heat conductivity is PRIMARILY due to free ELECTRONS. Following the Wiedemann–Franz law, thermal conductivity of metals is approximately PROPORTIONAL to the ABSOLUTE temperature (in kelvins) times electrical conductivity |
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| 43. |
A ball dropped from the top of tower falls first half height of tower in 10 s. The total time spend by ballin air is (Take g = 10 m/s?](1) 14.14 s(2) 15.25 s(3) 12.36 s(4) 17.36 s |
| Answer» | |
| 44. |
Distance between two object is 24 cm find where to place convex lens so that image of both objects are formed at the same position which is 18 cm from lens Find the focal length also |
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Answer» ejifddffu N jcExplanation:)6£543rrpr |
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| 45. |
Find equivalent resistance of circuit |
| Answer» EXPLANATION:HERE 2 OHM AND 2 OHM ARE PARALLEL R NET 1 = 2*2/2+2R NET 1= 1 OHM...............(1) 1 OHM AND 1 OHM ARE PARALLE R NET 2= 1*1/1+1 R NET 2 = 1/2 OHM............(2)R NET = 3+3+(1)+(2) [ SINCE ALL ARE IN SERIES]. R NET = 7.5 OHMS.HOPE THIS HELPS. | |
| 46. |
Area of rectangle=length ×breadth so find the area of a rectangle having sides equal to 20.5cm and 8.5cm. Pleaseèeeeeeee follow me |
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Answer» HELPS :GIVEN :Length = 20.5 cmBreadth = 8.5 cmSolution :We know that area of rectangle = length x braedth Area = 20.5 x 8.5 Area = 174.25 STAY HOME STAY SAFEX JOKER ALWAYS x |
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| 47. |
How doyou appreciate the role ofin every day like egraphite |
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Answer» I think role of metal in every day life Explanation:graphite is used in pencil leads iron and silver and COPPER, aluminum are used in UTENSILS at home.copper is used in ELECTRICAL systems small amounts of zinc is present in water gold PLATINUM in JEWELRY metal play an important role in life without it we are not complete |
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| 48. |
Class 10th ICSE question (Physics work energy).. |
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Answer» he KINETIC ENERGY of moving body is equal to be the product of the mass(m) of the body and square of its speed(v2).Kinetic energy =21×mass×(speed)2i.e., =21mv2Let mass of man is Mkg and speed is v and speed body is V1, the21Mv2=21{212Mv12} ...........(i)when man speed up by 1m/s, thanv=v+1∴21M(v+1)2=21{2M}⋅v12 .............(ii)DIVIDING Eqs. (i) by (ii), we get(v+1)2v2=212v=v+1v=2HOPEthis helps you please make myanswer as brainlist and follow me...plzzz |
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| 49. |
A worker covers a distance of 40km from his home to his place of work and 10km towards his home back then the displacement covered by the worker in the whole trip is |
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Answer» let us imagine a PATH A(INITIAL point) c(Final Point) BTotal distance(A-B)=40 KmTotal Distance(a-b-c)=50 KmDisplacement = Initial Point-final point40-10 =30 Km This ANSWER is 30 km |
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| 50. |
21. Two charged spheres 10 cm a part attract each other with a force of 3.0 x100N. What force results from each of thefollowing changes, considered separatly?a) (Both charges are doubled & the distance remains same.6) An uncharged identical spere is touched to one of thespheres, & then taken far away.c) The separation is increased to 30cm.Solve un |
| Answer» HI guysExplanation:i don't KNOW the answersearch in GOOGLE THANK you | |