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JEE Mains Exam 2021 : PCM : Electrostatics + Capacitance + Current electricity + Periodicity, Chemical Bonding, Coordination, Electrochemistry, Gaseous State and GOC (all effects) + AOD + PnC + BINOMIAL

45 pages, 120 questions, 2 questions with responses, 2 total responses,

Nisarg Bhavsar
Seventh-Day Adventist Higher Secondary School (SDA), Maninagar, Ahmedabad
Junior Kindergarten to 10th

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Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 Test Name : 12th AITS JEE Main [22.11.2020] Difficulty Level : Medium Test Type : Paid Q.1 In the circuit P Then A. B. C. D. Total Questions : 75 Total Marks : 300.00 Duration : 180.00 mins R, the reading of the galvanometer is same with switch S open or closed. A, B, C, D, Answer : A, Solution : NA Q.2 A galvanometer can be converted into a voltmeter by connecting a A. high resistance in parallel B. low resistance in series C. high resistance in series D. low resistance in parallel Answer : C, Page - 1/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 Solution : NA Q.3 Shown in the figure below is a meter-bridge set up with null deflection in the galvanometer. The value of the unknown resistor R is A. 220 B. 110 C. 55 D. 13.75 Answer : A, Solution : Q.4 The reading of ideal ammeter in the circuit is Page - 2/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 A. B. C. D. A, B, C, D, Answer : D, Solution : Since ideal ammeter has zero resistor hence the current will flow through ammeter and not through the 3 resistor. I= Q.5 = 5A Three charges are placed at the vertices of an equilateral triangle of sides 'a'. The force experienced by the charge placed at the vertex A in a direction normal to BC is - A. B. C. zero D. Answer : C, Page - 3/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 Solution : FR = 2F cos /2 = 2F cos 120/2 = 2F cos 60 =F= = However this force is the resultant force parallel to BC. Force perpendicular to BC is zero. Q.6 Figures below show regular hexagons, with charges at the vertices. In which of the following cases the electric field at the centre is not zero. A. B. C. D. 1, 2, 3, 4, Answer : B, Solution : NA Q.7 The variation of potential with distance r from a fixed point is shown in diagram. The electric Page - 4/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 field at r = 5 cm is - A. B. C. D. 2.5 V/cm ( 2.5) V/cm ( 2/5) V/cm (2/5) V/cm Answer : A, Solution : E= Q.8 = 2.5 V/m Two points are at distances a and b (a < b) from a long string of charge per unit length potential difference between the points is proportional to - A. B. C. D. . The A, B, C, D, Answer : D, Solution : E= Q.9 , dV = Edr, V= dr Vab log A long string with a charge of per unit length passes through an imaginary cube of edge a. The maximum flux of the electric field through the cube will be - Page - 5/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 A. B. C. D. A, B, C, D, Answer : D, Solution : max string through the cube= f. = a = Q.10 The total current supplied to the circuit by the battery is A. B. C. D. A, B, C, D, Answer : C, Solution : NA Page - 6/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 Q.11 If energy consumption of this circuit is 150 watt then find the value of resistance A. B. C. D. A, B, C, D, Answer : C, Solution : NA Q.12 The length of a given cylindrical wire is increased by 100%. Due to the consequent decrease in diameter the change in the resistance of the wire will be A. 100% B. 50% C. 300% D. 200% Answer : C, Solution : NA Q.13 The equivalent resistance between points A and B of the circuit given below Page - 7/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 A. B. C. D. 5R R/2 2R R Answer : B, Solution : NA Q.14 Find out Current in 2 A. B. C. D. Resistance? A, B, C, D, Answer : A, Solution : NA Q.15 In the figure shown length of each wire is l/2 and their radii are 2r and r. Then A. current density in both wires is same B. power dissipated in QR is 4 times that in the PQ Page - 8/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 C. ratio of potential drops on PQ & QR is 4 D. resistance of PQ is 4 times that of QR Answer : B, Solution : NA Q.16 The charge flowing in a conductor varies with time as Q = at bt2. Which of the following is correct ? A. The current decreases linearly with time B. The current reaches a maximum and then decreases C. The current falls to zero at t = a/2b D. The current changes at a rate 4b Answer : C, Solution : Q = at bt2 ; I = a 2bt; 0 = a 2bt; t = a/2b Q.17 The capacity of an isolated conducting sphere of radius R is proportional to A. R2 B. (1/R2) C. (1/R) D. R Answer : D, Solution : C = 4p R Q.18 The equivalent capacitance between points A, & B, Page - 9/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 A. B. C. D. A, B, C, D, Answer : B, Solution : All the 3C capacitors are in series + + = \ Ceq = C C and C are in parallel \ Ceq = 2C Q.19 Ceq between A, and B, - A. [ + x (K 1)] B. Zero C. Infinite D. Kx Page - 10/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 Answer : A, Solution : Ceq = C1 + C2 Now C1 = K C2 = Ceq = = (Kx + l x) [l + x (K 1)] Q.20 In the given circuit if point C is connected to the earth and a potential of 12000 V is given to point A. The potential at B is - A. B. C. D. 1500 V 1000 V 400 V 500 V Answer : D, Solution : Page - 11/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 V1 = = 500 VB VC = 500 ; VB = 500 (Q VC = 0) Q.21 A battery of 6 volt is connected to terminals of 3m long wire of uniform thickness. The potential difference between two points separated by 50 cm on the wire will be (in Volt) Answer : 1, Solution : Potential drop across 3m = 6Volt \ Potential drop across m = 1 volt Q.22 Vertices of a regular hexagon of sides 3 cm have three positive and negative charges each of magnitude = 1.5 nC as shown in diagram. A point charge of Q = 5nC is placed at centre of hexagon. The net force on 5 nC isAnswer : Solution : FR is the resultant of two (2F) forces FR = 2(2F) cos = 2F Hence net force is 0. Q.23 Electric field at x = 10 cm is 100 V/m and at x = 10cm is 100 V/m. The magnitude of charge enclosed by the cube of side 20 cm is Y , Then the value of Y will be- Page - 12/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 Answer : 8, Solution : fTotal = 2 2 E.a + E.a = 2 2E.a = 2 100 (20 10 2)2 = \ Q.24 In the circuit, the galvanometer G shows zero deflection. If the batteries A and B have negligible internal resistance, the value of the resistor R will be Answer : 100, Solution : NA Q.25 Charge on capacitor C is (in C) ? Page - 13/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 Answer : 20, Solution : V1 = 10 V\ = 10 2 = 20 mC Q.26 A. B. C. D. 1, 2, 3, 4, Answer : B, Solution : NA Q.27 A. B. C. D. 1, 2, 3, 4, Page - 14/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 Answer : D, Solution : NA Q.28 A. B. C. D. 1, 2, 3, 4, Answer : A, Solution : NA Q.29 A. B. C. D. 1, 2, 3, 4, Answer : D, Solution : NA Q.30 Page - 15/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 A. B. C. D. 1, 2, 3, 4, Answer : A, Solution : NA Q.31 A. B. C. D. 1, 2, 3, 4, Answer : D, Solution : NA Q.32 A. B. C. D. 1, 2, 3, 4, Answer : B, Page - 16/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 Solution : NA Q.33 A. B. C. D. 1, 2, 3, 4, Answer : B, Solution : NA Q.34 A. B. C. D. 1, 2, 3, 4, Answer : A, Solution : NA Q.35 Page - 17/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 A. B. C. D. 1, 2, 3, 4, Answer : D, Solution : NA Q.36 A. B. C. D. 1, 2, 3, 4, Answer : B, Solution : NA Q.37 Page - 18/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 A. B. C. D. 1, 2, 3, 4, Answer : A, Solution : NA Q.38 A. B. C. D. 1, 2, 3, 4, Answer : A, Solution : NA Q.39 A. B. C. D. 1, 2, 3, 4, Answer : C, Solution : Page - 19/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 NA Q.40 A. B. C. D. 1, 2, 3, 4, Answer : A, Solution : NA Q.41 A. B. C. D. 1, 2, 3, 4, Answer : D, Solution : NA Q.42 A. 1, Page - 20/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 B. 2, C. 3, D. 4, Answer : B, Solution : NA Q.43 A. B. C. D. 1, 2, 3, 4, Answer : D, Solution : NA Q.44 A. B. C. D. 1, 2, 3, 4, Answer : D, Solution : NA Page - 21/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 Q.45 A. B. C. D. 1, 2, 3, 4, Answer : B, Solution : NA Q.46 Answer : 5, Solution : NA Q.47 Answer : 6, Solution : NA Q.48 Page - 22/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 Answer : 6, Solution : NA Q.49 Answer : 2, Solution : NA Q.50 Answer : 3, Solution : NA Q.51 A. a, B. b, Page - 23/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 C. c, D. d, Answer : D, Solution : Q.52 A. a, Page - 24/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 B. b, C. c, D. d, Answer : D, Solution : Q.53 A. B. C. D. a, b, c, d, Answer : C, Solution : Page - 25/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 Q.54 A. B. C. D. a, b, c, d, Page - 26/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 Answer : A, Solution : Q.55 A. B. C. D. a, b, c, d, Answer : B, Solution : Page - 27/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 Q.56 A. B. C. D. a, b, c, d, Answer : C, Solution : Page - 28/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 Q.57 A. B. C. D. a, b, c, d, Answer : D, Solution : Page - 29/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 Q.58 A. B. C. D. a, b, c, d, Answer : C, Solution : Page - 30/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 Q.59 A. B. C. D. a, b, c, d, Answer : A, Solution : Page - 31/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 Q.60 A. B. C. D. a, b, c, d, Answer : B, Page - 32/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 Solution : Q.61 A. a, B. b, Page - 33/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 C. c, D. d, Answer : C, Solution : Q.62 A. B. C. D. a, b, c, d, Answer : C, Solution : Page - 34/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 Q.63 A. B. C. D. a, b, c, d, Answer : C, Solution : Q.64 A. a, Page - 35/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 B. b, C. c, D. d, Answer : D, Solution : Q.65 A. B. C. D. a, b, c, d, Answer : B, Solution : Page - 36/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 Q.66 A. B. C. D. a, b, c, d, Answer : B, Solution : Q.67 Page - 37/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 A. B. C. D. a, b, c, d, Answer : A, Solution : Q.68 Page - 38/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 A. B. C. D. a, b, c, d, Answer : A, Solution : Q.69 Page - 39/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 A. B. C. D. a, b, c, d, Answer : D, Solution : Q.70 A. B. C. D. a, b, c, d, Answer : C, Solution : Q.71 Page - 40/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 Answer : 1, Solution : Q.72 Page - 41/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 Answer : 2, Solution : Q.73 Answer : 6, Solution : Page - 42/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 Q.74 Answer : 4, Solution : Page - 43/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 Q.75 Answer : 3, Solution : Page - 44/45 Edunova Educational Foundation https://www.edunova.ac.in, edunovadigital@edunova.ac.in 9327101002 Page - 45/45

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