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.
| 2. |
What is refractive index of water? |
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Answer» ractive index or index of REFRACTION of a material is a dimensionless NUMBER that describes how fast light travels through the material. It is defined as{\displaystyle N={\frac {c}{V}},}where c is the speed of light in vacuum and vis the phase velocity of light in the medium. For example, the refractive index of water is 1.333, meaning that light travels 1.333 times as fast in vacuum as in water. Increasing refractive index corresponds to decreasing speed of light in the material.HOPE IT HELPS UH!!☺️ |
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| 4. |
2 conducting wire of same material and equal lengths and equal diameters are first conected in series and then in parallel in a circuit across the same potential difference . The ratio of heat produced in series and parellel would be ? plz quick |
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Answer» Two conducting wires of the same MATERIAL and of EQUAL LENGTHS and equal diameters are first connected in series and then in PARALLEL in a circuit ACROSS the same potential difference.I hope it will help you plz make me brainliest |
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| 5. |
When the plane is parallel to h.p and perpendicular to v.p and p.p is always first |
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Answer» e plane is parallel to h.p and perpendicular to v.p then p.p is always b.v firstIf a plane is parallel (pp) to one of the reference planes, the parallel projection to the plane GIVES the true shape and scale as the plane here is parallel to the HORIZONTAL AXIS, the real shape is viewed from a top view.Whereas if a plane is parallel to h.p and perpendicular to v.p, then pp is always back view (BV) FIRST. |
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| 6. |
Express 0.00000538 in powers of 10 |
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Answer» 0.00000538=538×10^-8 |
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| 7. |
If Rs and Rp equivalent resistance of two resistors of 4ohm in 6ohm when connected in series and parallel respectively ,find the ratio of Rs and Rp |
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Answer» hat, RS and RP equivalent RESISTANCE of two resistors of 4 ohm in 6 ohm when CONNECTED in series and parallel respectively.We have to find the ratio of Rs and Rp.Rs = R1 + R2 = 4→ R1 + R2 = 4Similarly, 1/Rp = 1/R1 + 1/R2 = 6→ 1/R1 + 1/R2 = 6→ (R2 + R1)/(R1R2) = 6→ 4/(R1R2) = 6→ R1R2 = 4/6→ R1R2 = 2/3Now, Rs/Rp = 4/(2/3)Rs/Rp = 12/2Rs/Rp = 6/1Therefore, the ratio of Rs and Rp is 6:1. |
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| 8. |
X+6/y=6 3x-8/y=5. solve by substitution method |
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Answer» Explanation:x=6y=2by Substitution method.above SOLUTION PHOTO HELPS U!thank you. |
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| 9. |
Velocity is the chance of position it is measured in |
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Answer» metre/second(m/s) is used for MEASURING VELOCITY.Hence, the SI unit of velocity m/s.Please follow me & MARKED this ANSWER as brainlyest. |
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| 10. |
The capacitance of a parallel plate capacitor is 50 pF and the distance between the plates is 4mm. It is charged to 200 V and then the charging battery is removed. Now a dielectric slab (kappa=4) of thickness 2mm is placed. Determine (i) final charge on each plate (ii) finial potential difference between the plates (iii) final energy is the capacitor. |
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Answer» The capacitance of a PARALLEL plate CAPACITOR is 50 pF and the distance between the plates is 4mm. It is charged to 200 V and then the charging battery is removed. Now a dielectric SLAB (kappa=4) of thickness 2mm is placed. Determine (i) FINAL charge on each plate (ii) finial potential difference between the plates (iii) final energy is the capacitor. |
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| 11. |
Activitys to observe that electrostatic force |
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Answer» Electrostatic FORCES are non-contact forces; they pull or push on objects without TOUCHING them. Rubbing some materials together can result in something called 'charge' being moved from one surface to the other. Charged objects pull on other uncharged objects and MAY either push or pull on other charged objectsmark me as BRAINLIEST PLS pls.Explanation: |
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| 12. |
Sics MCQ Questions for Class 12 Pdf Question 14. A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 A, the efficiency of the transformer is approximately (a) 30% (b) 50% (c) 90% (d) 10% |
| Answer» ELABORATE the QUESTION | |
| 13. |
In a circular motion________ changes continuously . |
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Answer» directionplz PUT me on the brainliestExplanation: |
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| 14. |
What is the ratio of equivalent capacitance when the capacitors are in series to that when they are joined in parallel |
| Answer» DONT KNOW the answersorry YAT | |
| 15. |
If coil is open, then L and R becomes (a) infinity, zero (b) zero, infinity (c) infinity, infinity. (d) zero, zero |
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| 16. |
Sics MCQs for Class 12 Chapter wise with Answers Pdf Question 5. In an LCR circuit, capacitance is charged from C to 2C. For resonant frequency to remain unchanged, the inductance should be changed from L to (a) 4 L (b) 2 L (c) L/2 (d) L/4 |
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| 17. |
Series ac circuit has inductance L, resistance R and angular frequency to, the quality factor Q is |
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Answer» your ANSWERI HOPE you have UNDERSTOOD FAM |
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| 18. |
If an AC voltage is applied to an ICi? circuit, which of the following is true? (a) I and V are out of phase with each other inR. (b) I and V are in phase in L while in C, they are out of phase. (c) I and V are out of phase in both C and L. (d) I and V are out of phase in L and in phase in C. |
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Answer» If an AC VOLTAGE is applied to an ICi? CIRCUIT, which of the ... (a) I and V are out of PHASE with each other INR. (b) I and V are in phase in L while in C, they are out of .. |
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| 19. |
Which quantity is increased in a step-down transformer? (a) Current (b) Voltage (c) Power (d) Frequency |
| Answer» HELLO dearExplanation:it is VOLTAGEHOPE IT HELP YOUPLEASE MARK ME AS BRAINLIEST | |
| 20. |
Choose the correct statement. (a) A capacitor can conduct a dc circuit but not an inductor. (b) In a dc circuit the inductor can conduct but not a capacitor. (c) In dc circuit both the inductor and capacitor cannot conduct. (d) The inductor has infinite resistance in a dc circuit. |
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Answer» (d) is the CORRECT ANSWEREXPLANATION:PLEASE MARK me as BRAINLIST |
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| 21. |
Questions for Class 12 Physics with Answers Pdf Question 7. In an a.c. generator, a coil with N turns, all of the same area A and total resistance R, rotates with frequency ω in a magnetic field B the maximum value of emf generated in the coil is (a) NABR (b) NABω (c) NABRω (d) NAB |
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Answer» "NABω" (and any subsequent WORDS) was ignored because we limit QUERIES to 32 wordsExplanation:The maximum value of emf generated in the coils is. check- CIRCLE. Text SOLUTION. N. |
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| 22. |
Sics MCQs with Answers for Class 12 Question 3. An ac circuit has a resistance of 12 ohm and an impedance of 15 ohm. The power factor of the circuit will be (a) 0.8 (b) 0.4 (c) 0.125 (d) 1.25 |
| Answer» B is the CORRECT ANSWER of this QUESTION | |
| 23. |
The peak value of ac voltage on a 220 V mains is (a) 200√2 V (b) 230√2 V (c) 220√2 V (d) 240√2 V |
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Answer» Peak Value = √2*RMS Value of a sinusoidal WAVEFORM. ... HENCE, for 220v AC, peak value will be 220×√2 which is 311.1v APPROX |
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| 24. |
sics Multiple Choice Questions with Answers for Class 12 Pdf Question 9. In a series, LCR-circuit, resonant frequency depends on |
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Answer» How the RLC series circuit behaves for the frequencies above and below the RESONANT frequencies. For frequencies below resonant FREQUENCY, the capacitive reactance is more than the INDUCTIVE reactance. ... For frequencies above resonant frequency, the inductive reactance is more than the capacitive reactance. |
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| 25. |
The core of any transformer is laminated so as to (a) reduce the energy loss due to eddy currents. (b) make it light weight. (c) make it robust and strong. (d) increase the secondary voltage. |
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Answer» The core of any transformer is laminated so as to reduce the ENERGY loss due to EDDY currents.✧ParadiseLost✧ |
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| 26. |
In circular motion direction at any instant is given by drawing _______ |
| Answer» TION:HOPE it HELPS you ✌️PLZZ MARK me as BRAINLIEST ☺️☺️ | |
| 27. |
Definition of speed and density |
| Answer» TION:Speed= Distance travelled/Time takenDensity= AMOUNT of MATTER(MOLECULES) contained in a unit of VOL | |
| 28. |
which of the following best describes the image formed by a convex mirror when the object distance from the mirror is less than the absolute value of the focal length 1) virtual upward and enlarged 2) real inverted and reduced 3)virtual upright and reduced 4) real inverted and enlarged |
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| 29. |
Mathematical derivetios of physics |
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Answer» ives: A derivative is a RATE of change, which, geometrically, is the slope of a graph. In physics, velocity is the rate of change of POSITION, so mathematically velocity is the derivative of position. ACCELERATION is the rate of change of velocity, so acceleration is the derivative of velocity. |
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| 30. |
A box winning 202.5 and is placed on the surface of the earth what will be its weight at a distance which is 1 by 8 times what that of the radius of the earth |
| Answer» HELLO if you PLAY FREE fireExplanation:my I'd GANGSTER~$ | |
| 31. |
What is gravity ? what will happen when there is no gravity in your room????? |
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Answer» if there is no gravity present in our room then we can't stable to LIVE on ground BCZ WITHOUT gravity we flout in the AIR |
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| 32. |
The process of adding controlled impurities in semiconductor is known as |
| Answer» DOPING is the ANSWERAND i HOPE it BRINGS a smile on YOUPLEASE put me on the brainliestExplanation: | |
| 33. |
The phase difference between the alternating current and emf is TE/2. Which ofthe following cannot be the constituent of the circuit? (a) C alone (b) L alone (c) L and C (d) R and L |
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Answer» If the PHASE difference between V and I is pi/2Hence,Power=V×I=VI COS pi/2=0Since power is 0 it could only consists of REACTIVE ELEMENTS(L&C),Resistance R canonot be present.THANKS!!☺ |
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| 34. |
Two point charges of +2microcoulomb and +6microcoulomb repel each other with a force of 12n. if each is given as additional charge of -4microcoulomb . what will be the new force |
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Answer» -4NExplanation: You can use the formula, F=Kq1q2/r^2=> 12=9×10^9×2×10^-6×6×10-6/r^2From here we get the value of r^2=9×10^-3Now, after ADDING a charge of 4 micro COULOMB each, new CHARGES becomes -2uC and 2uC, so again using the formula, we get the value of F' = -4N |
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| 35. |
Q.31 For a body moving along x-axis, the distance travelled by body from a reference point is given as function of timetas x = até + b, where a and b are constants, then thedimension of Vab is same as -(A) Speed(B) Distance travelled(C)Acceleration(D) None of these |
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Answer» Question:-For a body moving ALONG x-axis, the DISTANCE travelled by the body from a reference POINT is given as function of time as where and are constants. Then the dimension of is same as,(A) Speed(B) Distance travelled(C) Acceleration(D) None of theseSolution:-Given,According to Principle of Homogeneity, Then,And,Then,This implies dimension of is the same as that of speed. Hence (A) is the ANSWER. |
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| 36. |
A rod PQ of length 1 is moved in uniform magnetic field \vec{B} as shown. What will be the emf induced in it? |
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Answer» The maximum emf induced in the coil will beExplanation:32 Tπ 2 NB 0 (a 2 +ab+b 2 ) The number of turms in he spiral coil per unit radial width n= b−aN The emf induced in an 'almost circular' part of spiral at radial DISTANCE r is dV= dtdϕ = dtd(nB.πr 2 ) =nB 0 T2π cos( T2π t)πr 2 Since these are almost circular, but actually end to end connected, each of these rings at radial distances varying from a to b would add up to given total emf ACROSS the loop.Hence V=∫ ab nB 0 T2π cos( T2π t)πr 2 dr= 32 Tπ 2 NB 0 (a 2 +ab+b 2 ) cos( T2π t) [Since (b 3 −a 3 )=(b−a)(a 2 +ab+b 2 )]Thus the maximum VALUE of the emf is= 32 Tπ 2 NB 0 (a 2 +ab+b 2 ) |
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| 37. |
How does the mutual inductance of a pair of coils change when (i) distance between the coils is increased and (ii) number of turns in the coils is increased? [AI 2013] |
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Answer» Explanation: MARK my answer as braliest(i) Mutual inductance decreases. (ii) Mutual inductance increases.It CAUSES DECREASE in magnetic flux linked with the coil C2. Hence induced emf in coil C2 decreases by relation ε2 = – dφ2/dt. Hence mutual inductance decreases. (ii) From relation M21 = μ0n1n2Al, if number of turns in one of the coils or both increases, means mutual inductance will increase. |
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| 38. |
When a coil is rotated in a uniform magnetic field at constant angular velocity, will the magnitude of induced emf set up in the coil be constant? Why? [HOTS] |
| Answer» YES. The magnitude of the EMF generated in this way is given by: E = BLv Where E is the GENERATOR EMF (or back EMF in a motor) and V is the VELOCITY of the conductor through the fieldplz put me on the brainliestExplanation: | |
| 39. |
In an LCR-series ac circuit, the voltage across each of the component L, C and R is 50 V. The voltage across the LC-combination will be (a) 50 V (b) 50√2 V (c) 100 V (d) zero |
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Answer» In an LCR series a.c. circuit, the voltage across each of the components, L,C and R is 50V. The voltage across the LC combination will be (a) |
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| 40. |
Predict the direction of induced current in a metal ring when the ring is moved towards a straight conductor with constant speed v. The conductor is carrying current I in the direction shown in the figure. [Delhi 2012] |
| Answer» HEY MATE where is the FIGURE | |
| 41. |
A wire and a rod AB are in the same plane. The rod moves parallel to the wire with the velocity v, then which end of the rod is at higher potential? [DoE] |
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Answer» The ROD moves parallel to the wire with a velocity V . Which one of the following STATEMENTS is true about ... rod. POTENTIAL at A will be higher than that at B. |
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| 42. |
The closed loop (PQRS) of wire is moved into a uniform magnetic field at right angles to the plane of the paper as shown in the figure. Predict the direction of the induced current in the loop. [Foreign 2012] |
| Answer» HEY MATE where is the FIGURE | |
| 43. |
A light metal disc on the top of an electromagnet is thrown up as the current is switched on. Why? Give reason. [AI2013] |
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Answer» sjs snsis sjxndi DJ dJjd dNjd jd KS kd jd you have to go to sleep in the WORLD name is on the phone with my MOM is going to be a good NIGHT and I don't know I don't know |
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| 44. |
A current carrying wire (straight) passes inside a triangular coil as shown in figure. The current in the wire is perpendicular to paper inwards. Find the direction of induced current in the loop if current in the wire is increasing with time. [DoE] |
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Answer» I am don't KNOW EXPLANATION:PLEASE FOLLOW me please |
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| 45. |
A rectangular loop of wire is p right, away from the long straight wire through which a steady current I flows upwards. What is the direction of induced current in the loop? |
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| 46. |
how many types of defects in vision you know in human beings? enlist them all with its cause and method of its rectification? |
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Answer» There are 3 types of defects in vision:_MyopiaHypermetropiaCataractExplanation:Myopia- Myopia is that defect of EYE due to which a PERSON can't see the distance object clearly (thought he can see the NEARBY object clearly).Hypermetropia- Hypermetropia is that defect of eye due to which a person can't see nearby object clearly(thought he can see the distance object clearly)CATARACT- The medical condition in which the lens of eye of a person becomes progressively cloudy resulting in blurred vision is CALLED Cataract. |
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| 47. |
A Ray of light parallel to principal axis is incident on the reflecting surface on convex mirror draw a ray diagram to show image formation in this case also state nature and size of the image |
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Answer» case the RAYS are PARALLEL to each other and so IMAGE PLACED at infinity distance. Please mark me. |
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| 48. |
Distance is dash displacement |
| Answer» DISTANCE is EQUAL DISPLACEMENT | |
| 49. |
How can be relax ourself give 5things to do relex? |
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Answer» meditationsleepsilencepeaceconcentrationExplanation:FOLLOW memark as BRAINIEST |
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| 50. |
Derive an expression for the time period and height of artificial satellite from the surface of the earth. |
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