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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.
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33. Assuming the diodes to be silicon with forward resistance zero, the current / in the following circuitis1 koWWWE = 10 V(1) 10.4 mA(2) 9.7 mA(3) 10 mA(4) Zero |
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| 3. |
31. There are two radioactive substance A and B. Decay constant of B is two times that of A, initially bothhave equal number of nuclei. After n half lives of A,rate of disintegration of both are equal. The value ofn is3.3(1) 5(2) 2(3) 4(4) 1 |
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Answer» tion:31. There are TWO radioactive substance A and B. Decayconstant of B is two times that of A, initially bothhave equal number of NUCLEI. After n half lives of A,rate of DISINTEGRATION of both are equal. The value OFN is3.3(1) 5(2) 2(3) 4(4) 1 |
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27. Light described at a place by equation E = 200ex 10155-')t + sin(10 x 1016 s=")]falls on metal surface having work function 2 eV, themaximum kinetic energy of photoelectrons?(1) 8 eV(2) 10 eV(3) 4.59 eV(4) 3.27 eV |
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Answer» 4.56Explanation:WORK DONE = max k.E to process required electron GAIN by metal SURFACES |
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28. Find the de Broglie wavelength of photoelectrons ejected with maximum kinetic energy, when light ofwavelength 100 nm is incident on a cesium surface.(Work function of cesium = 3.4 eV)(1) 2(2) 4(3) 1.2 Å(4) 2 |
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Answer» ..................................................... |
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44. Two trees are 2 m apart. A person sees them from a distance of 2 km. Will he see the trees resolved?(1) Yes(2) NoMay be resolved(4) None of these |
| Answer» TION:Given Two trees are 2 m apart. A person sees them from a DISTANCE of 2 km. Will he see the trees resolved? We need to find whether trees are resolved. The POWER of an optical device to identify near by or adjacent images is RESOLVING power. So d/D > = resolution power of eye So d/D = 2/2 x 10^3 = 2 / 2 x 10^-3 = 0.001 Now resolving power = 1 / 60 degree = 1/60 x π/ 180 rad = 3.14 / 10,800 = 0.0002907 Now 0.001 > 0.00029 So d/D > resolution power of eye Therefore the trees appear resolved. Reference link will bebrainly.in/question/14991776 | |
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43. In Young's double slit experiment value of e, for which the phase difference at a point P, is 1.57 rad.is0.1D>>(1) sin" À2) sin(Q)sin" @CHỮHI 10/11 |
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Answer» I have been TRY but I don't UNDERSTAND this QUESTION |
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| 8. |
State differences between AC and DC ?name one sources each of AC and DC |
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Answer» The difference between AC and DC lies in the DIRECTION in which the electrons flow. In DC, the electrons flow steadily in a SINGLE direction, or "FORWARD." In AC, electrons keep switching directions, SOMETIMES going "forward" and then going "BACKWARD." |
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| 9. |
How can the strength of magnetic field produced current carrying circular coil increased? |
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Answer» When we increase the distance from the COIL, the magnetic field PRODUCED by a current carrying circular coil DECREASES. ... So if weincrease the number of TURNS of the coil, more current will pass through the wire which indicates that the magnetic fieldassociated with it also increases.Explanation:hope this helps you plz MARK as brainliest answer |
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| 10. |
In terms of rydberg constant R, the wave number of 2nd lyman line is 1)3R 2)R 3)5R/36 4)8/9R |
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Answer» 4 (8/9R)Explanation:2nd Lyman LINE comes from pashchan series that is n=3So1/Wavelength = R (1/1^2 - 1/3^2)1/Wavelength = R (1/1-1/9)WAVENUMBER = 8R/9 |
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| 11. |
NEET & AllMS NEET & 27. A homogeneous bar of length L and mass M is at a distance h from a point mass ma shown. The force on m is F, then find F |
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Answer» tion:Consider a small element DX of the rod at a distance X from the left END of the rod.Mass of this small element is DM = M/LdxDistance of this small element from mass m is x + h.Force on m due to this small element is dF = GmdM/(x +h)^2To get the TOTAL force F on the mass m we integrate dF from x= 0 to x = LF = ∫^x=L and x = 0 GmM/L dx/ (x + h)^2 = - GMm/L (1/L + h - 1/L) = GmMh/L(L +h)Thus the force on m due to homogeneous bar is GMmh/L(L +h).Read more on Brainly.in - brainly.in/question/12976243#readmore |
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| 12. |
The magnitude of electric feild E such that an electron placed in it would experience an electric force equal to its weight is given by |
| Answer» WEIGHTING machinehope it is not RIGHT | |
| 13. |
Which of these is not a fibre (a) leather (b) hair (c) wool (d) cotton |
| Answer» HAIR(B) is the ANSWER PA | |
| 14. |
Non flammable substances example is lpg,alcohol, petrol, rock. Which one is correct |
| Answer» NON FLAMMABLE HOPE it HELPED you | |
| 15. |
An inductor 20 mH, a capacitor 100 uF and a resistor 50 22 are connected in series across a source of emf, V = 10 sin 314 t. The power loss in the circuit is [NEET-2018] (1) 0.79 W (2) 0.43 W (3) 1.13 W (4) 2.74 W |
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Answer» An inductor 20 MH, a CAPACITOR 100 uF and aresistor 50 22 are connected in series across asource of emf, V = 10 sin 314 t. The power lossin the circuit is:option: (A) 0.79 W |
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| 16. |
A car is moving at a speed of 72 km/hr. If the wheels of diameter 0.5 m are stopped in 20 rotations by applying the brakes, angular retardation produced by the brake is :5.5 rad/s2 (B) 33.5 rad/s2(C) 29.5 rad/s2 (D) 25.5 rad/s2 |
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Answer» Here: SPEED of car = 72 km/hr =72×518=20cm/sDiameter of each wheel=0.52mNumber of ROTATION = 20The relation for angular speed is ω=υr=200.25=80 rad/secAngular displacement Q=2π×20=40 π radThe relation for angular retardation is GIVEN byω2=ω20+2aQ 0=(80)2+2a(40π) Or a=(80)280π=−25.5rad/s2 |
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| 17. |
A double star is a composite system of two stars rotating about their centre of mass under their mutual gravitational and attraction let us consider such a double star which has two which has two of masses M each separation L if D is the time period of rotating about their centre of mass then find T |
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Answer» m).EXPLANATION:From the question we get that the masses are placed at a GIVEN aligned position. So, the two star's gravitational force and the centrifugal force of attraction will be same.For the center of the two BODY's to be symmetrical we get that the DISTACNE must be 2mx=ml. So, the distance will be x=l/2. So, the force of the centrifugal will be mω^2x or mω^2(l/2). The gravitational force will be Gmm/^2. So, on equating the two equation we will get that mω^2(l/2)=Gmm/^2. Since, ω=2π/T. So, on substituting we will get that (4π^2/T^2)*1/2=Gm/l. Or the value of the TIME period will be T^2=8π^2*l/Gm. So, the time period T will be π√(8l/Gm)_______________❤ |
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| 18. |
Derive an expression to find the work done by the spring when the block attached to the spring is pulled through a distance of xm also give the plot showing the variation of Fs versus x. |
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Answer» non variableExplanation:FORCE is DIRECTLY proportional to displacement in OPPOSITE direction |
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| 19. |
Given tha t between 2 pair of charges the forces are -9N and +9 N respectively. Comment about nature of charges. |
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Answer» one charge is +ve and another is negative but the magnitude of both charge is same .FIRST is +ve charge and second is negative charge.-9N force ACT on it is in opposite direction and repel and another is attracted.Explanation:please mark me as a brainliest ANSWER please for my HAPPINESS..... |
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| 20. |
Where is the centre of gravity of the following objects situated? l. Ring 2. Rhombus 3. Scalene triangle 4. Cylinder. |
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Answer» Ring-centre of ringRhombus-the POINT of INTERSECTION of the diagonalsScalene triangle-the point of intersection of mediansCylinder-mid point of AXIS of cylinderExplanation: |
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| 21. |
if the image is diminished then the magnification will be in the form of fraction or will the magnification be negative |
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| 22. |
the radius of the curvature of a convex mirror on a moving automobile is 2 metre a track is coming behind it at a distance of 2.5 metre calculate the position and nature of the images find the magnification produced by the mirror |
| Answer» TION:So, the IMAGE is FORMED 0.77 m BEHIND the MIRROR. | |
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25. If the half life of a material is 10 years, then in what time, it becomes th part of the initial amount?(1) 15 years(2) 20 years(3) 25 years4 30 years |
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Answer» f life of a material is 10 years, then in whattime, it becomes ¼th part of the INITIAL amount? HALF life = 10 years Time (T)✪Now ,✪ OPTION (2) 20 years |
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V2 m (S. A wire of length / carries a current I along the Y direction and magnetic field is8 (+ 1+ k)7. The magnitude of Lorentz force acting on the wire isBl 6. ll c. VZBI a. Bil0. The vertical components of Earth's magnetic field at a place is equal to theNI |
| Answer» TION:not SURE about the ANSWER | |
| 25. |
Lead,aluminium,copper,water,irong arrange in ascending order with their specific heats |
| Answer» WATER COPPER ALUMINUM IRON LEAD | |
| 26. |
Who is the first blank president of Australia |
| Answer» NELSON MANDELA is the FIRST BLACK PRESIDENT | |
| 27. |
AIATS -7 Practice Test (Code A) 21. In an ore at the time of estimation, the ratio of U238 to.Pb206 is 1:7. Calculate the age of ore, assuming thatall the lead present in the ore is the final stable productof U238. (Half life of U238 = 4.5 * 10 years)(1) 1.87* 109 yr 2 13.5 * 109 yr(3) 8.5 x 109 yr (4) 9* 10º yr |
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Answer» Total age of the GIVEN ore isExplanation:If the ratio of U238 and Pb206 in the given ore is 1 : 7so we can say that the fraction of U PRESENT at that time isso it is three TIMES the half lifeso we will havegiven thatso we will have#LearnTopic : Half lifebrainly.in/question/15713062 |
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PLEASE ANSWER URGENTLY: what are stationary waves? draw its graphical representation. |
| Answer» OW known as standing WAVE which OSCILLATES in time | |
| 29. |
Repeat the steps to find out DC output for LC and CLC filters for half wave as well as full wave rectifiers |
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Answer» The rectifier contains A.C COMPONENTS as well as D.C components. When the output passes through the inductor, it OFFERS a HIGH RESISTANCE |
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| 30. |
Find the rank of the following matrices: |
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Answer» Ggghkgfujjbxd Vvcgnnvcxvv Czfbnbcfdfhh VCG |
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| 31. |
An electric heater supplies heat to a system at a rate of 100 J/s. If the system performs work at a rate of 75 J/s, calculate the internal energy increased. |
| Answer» 25W is the ANSWER of QUESTIONS | |
| 32. |
1. If the distance travelled by an object is directly proportional to the time taken, then it is said to travel withA) zero velocityB) Constant speedC) constant accelerationD) non-uniform velocity and explain your answer |
| Answer» B) CONSTANT SPEED is UR ANSWER | |
| 33. |
What is meant by equipotential service ? Give its important properties. |
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Answer» meant by equipotential service ? Give its important properties.→ Equipotential surface is a surface at which potential is same everywhere.» WORK done in moving a test charge from one point to another on an equipotential surface is zero.» Equipotential surfaces do not intersect each other.» Equipotential surfaces indicate regions of strong or WEAK ELECTRIC fields.» Electric field is NORMAL to the equipotential surface.Hope it helped u. |
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| 34. |
A U-tube is partially filled with water. Oil which does not mix with water is next poured into one side, until water rises by 25 cm on the other side. If the density of oil is 0.8, the oil level will stand higher than the water level by : 1-) 6.25 cm 2712.50 cm 3 ) 31.75 cm 4) 62.50 cm |
| Answer» DENSITY of OIL /density of water=0.8i) 12.5 cmExplanation:0.8*(h+25)=50h=12.5 | |
| 35. |
Earth's atmosphere is richest in |
| Answer» TH emits huge amount of infrared RADIATION and thereby makes the atmosphere richest in infrared rays. * When SUNLIGHT (solar radiation) hits the earth, some of the energy is absorbed by the earth that ULTIMATELY HEATS up the earth. | |
| 36. |
Two vessels have different base area. They are filled with water to the same height. If theamount of water in one is 4 times that in theother, then the ratio of pressure on theirbottom will be(A) 16:1(B) 8:1(C) 4:1(D) 1:1 |
| Answer» TION:Given that,P( Aˉ )P(A) = 115 We know that,P( Aˉ )=1−P(A)Now,1−P(A)P(A) = 115 ⇒11P(A)=5−5P(A)⇒16P(A)=5⇒P(A)= 165 and P( Aˉ )=1−P(A)=1− 165 = 1611 | |
| 37. |
Specific heat values in ascending order |
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Answer» List of orders of MAGNITUDE for specific HEAT capacitySI prefix Factor Value J·kg−1·K−1 ItemDeca- 101 94 RadonHecto- 102 120 Uranium129 Gold130 IridiumOsmium139 Mercury145 Iodine158 Xenon240 Caesium246 Ethanol248 Krypton363 Rubidium377.48 Brass385 Copper420 Cobalt444 Iron480 BromineChlorine502 Diamond520 Argon677 Glass720 Graphite757 Potassium824 Fluorine900 AluminiumKilo- 103 1030 Neon1230 Sodium1660 Pentane≈ 2000 Oil2060 ICE (0 °C)2100 Coconut oil3582 Lithium4186 Water4219 Heavy water4700 Ammonia (liquid)5193 Helium104 14304 Hydrogen |
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| 38. |
A cube made of material having a density of 0.9 x 100 kg/m floats between water and a liquid of density 0.7 x 10 kg/m", which is immiscible with water. What part of the cube is immersed in water? |
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Answer» tion:In the end, the cube floats only. So according to the law of floatation, its WEIGHT = total upthrust Total upthrust = upthrust provided by liquid + upthrust provided by WATER = weight of liquid displaced + weight of water displaced => VDG = Vd(liquid)g + volume of cube submerged x d(water)g ( V is the total volume of SOLID) ATQ;900Vg = 70Vg + 1000*volume of cube submerged*g=> 0.83Vg = volume of solid submerged*g => volume of solid submerged / V = 0.83 or 83/100=> Volume of solid submerged = 0.83 of total V Hence, 0.83 of the total volume is immersed.If we were to CALCULATE how much % of volume is submerged,= volume of solid submerged / volume of solid x 100 = 0.83 x 100 = 83% Hence |
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| 39. |
A mass 5kg starts sliding from A on a smooth surface show in figure find the velocity of the mass at B and C |
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Answer» ______________________The velocity of the ball at POINT B is 7 m/s, and at point C the velocity of the ball is 0 m/s.At point A, ball has a potential energy onlyNow ACCORDING the law of energy conservation, the total energy of a particle must be conserved.When ball moves from point A to point B,Change in potential energy= Change in KINETIC energymg(5-2.5)=0.5m((v_b)^2-0)on solvingv_b=7 m/sWhen ball moves from point A to point C,Change in potential energy= Change in kinetic energymg(5-5)=0.5m((v_c)^2-0)on solvingv_c=0 m/sTherefore, The velocity of the ball at point B is 7 m/s, and at point C the velocity of the ball is 0 m/s.=================================== |
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| 40. |
Define potental due to a system of charges ?. |
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Answer» potental due to a system of CHARGES ?.→ The potential at a point due to a group of charges around it , is the ALGEBRAIC sum of potentials due to individual charges.» LET . V¹ , V² ............Vñ be the potentials at a point due to charges q¹ ' q² ........qñ.» The total potential at that point due to all charges is, » V= V¹+ V² +..............VñHope it helped u.. |
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| 41. |
If you hold a plastic comb in your hand and rub it in your hair it will get charged . However if you do the same with a metal comb it will not get charged .Why?.... But if the metal comb has a plastic handle and you hold it from the handle it will also get charged Why????? |
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Answer» Because PLASTIC has more elecrolyti force which is LESS in metals This the following is OBSERVED |
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| 42. |
How to celebrate the christmas in f |
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Answer» rite the complete question CAREFULLY then celebrate the Christmas with PEACE, HARMONY and all the RITUALS and customs FOLLOWED by our predicessors.... |
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| 43. |
How the intencity and direction of the magnetic field of bar magnet can be determined |
| Answer» HAHA haha haha haha haha haha hrururuurrhhr | |
| 44. |
Define Electrostatic potential.? |
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Answer» -An electric potential is the amount of WORK needed to move a unit of charge from a REFERENCE point to a specific point inside the field without PRODUCING an acceleration. Typically, the reference point is the EARTH or a point at infinity, although any point can be used. |
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| 45. |
Calculate the molar specific heat at constant volume of neon gas |
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| 47. |
. Assertion : Motion of satellites around their planets is considered as accelerated motion.Reason:During their motion, the speed remains constant, while the direction of motion changescontinuously.(a) both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).(0) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).(c) Assertion (A) is true but reason (R) is false(d) Assertion (A) is false but reason (R) is true. |
| Answer» C) is the correct OPTION Explanation:plz plz MRK as brainliest I NEED it | |
| 49. |
What is different volatile and non _volatile? |
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Answer» e ,Volatile substances means substances which have high calorific value and can burn at high speed or even at SLOW rate .NON- Volatile substances means substances which have low calorific values or nill so that they can't burn with flame .HOPE you find it helpful!!Do mark it as brainliest!!! |
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| 50. |
A body is displaced by 20m,when a force of 20N acts on the body.The work done is |
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Answer» W=F*D=20*20=40JExplanation: |
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