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Sa, , , Preeti reached the metro s, 1 that the escalator was not aoe potion, walked up the stationary escalator in ti, {;.On other days, if she remains stati me, on the moving escalator, then the eaclane, takes her up in time t,. The time taken, her to walk up on the moving escalator will, , t (NEET 2017}, ttte (py fite tt, , @+5 mer an (d}t, -t,, , 2. If the velocity of a particle is v = At + Bt?, , where A and B are constants, then the, distance travelled by it between 1s and 2s, , = INEET 2016], (a) 3A+7B wSa+le, , A,8 3, sts )5Aeae, , 3. Two cars P and Q start from a point at the, same time in a straight line and their, positions are represented by, Xp (t) = at +bt* and Xp (t)= ft -t?, At, , what time do the cars have the same, , velocity? INEET 2076], a-f arf at+f f-a_, @i>o 20-0 x aeb) 20+), , 4, A particle of unit mass undergoes, one-dimensional motion such that its, , velocity varies according to v(x} =B x?", where, [} and n are constants x is the, position of the particle. The acceleration of, the particle as a function of x, is given by, CBSE AIPMT 20, ee I 2015], , i (b) -2np? xt", {e) -28? xr" (a) -2np? e*"**, , 5. If vectors A =cos wt i+ sin wt jand, , oj are functions of time,, then the value of f at which they are, orthogonal to each other, is(CBSE AIPMT 2015), , = weit my.) =, (t=Z wt=s5 (jt== (@t=0, , , , B=cos S-i-+sin, , 6. Astone falls freely under gravity. It covers, distances h,, h, and A, in the first 5s, the, , next 5s and the next 3s respectively, The, relation between hy, h, and h, is [NEET 2013], , (a), =2h, = Shy oy n= z=, (0) hy = 3h, and hy = 3h, (a) hy = hy = Ny, 7. The motion of a particle along a straight, line is described by equation, x=8+12t-0, , where, x is in metre and t in sec. The, , retardation of the particle when its velocity, becomes zero, is [CBSE AIPMT 2012], (a) 24ms~ (b) zero (c} ms (G12 ms?

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& A boy Standing at the top of a tower of 20 m,, hoight drops a stone. Assuming, g = 10 ms”., tho velocity with which It hits the ground is, , (8) 20 mvs {CBSE AIPMT 2011], (b) 40 rvs, , (©) 5 nvs, (d) 10 ms, , + A body is moving with velocity 30 nvs, towards Kast. After 10s, its velocity becomes, AO Ws towards North. The avorage, Acceleration of the body is [CBSE AIPMT 2011), (a) 7m/s* () V7 mis? (¢) Sms? (@) 1s", , 10. A ball is dropped from a high rise platform, alt =0 starting from rost. After 6 s, another, ball is thrown downwards from the same, platform with a speed v. The two balls, Meet att = 18s, What is the value of v?, , (Take g = 10 ms™*) [CBSE AIPMT 2070}, , (a) 74ms"* (b) 55ms-" (c) 40ms™" (d) GOms, , 11. A particle moves a distance x in timet, according to the equation x = (t +5)", The, , acceleration of particle is proportional to, , [CBSE AIPMT 2010], (a) (velocity)"’? (b) (distance)*, (©) (distancey-* (d) (velocity?!, , 12. A particle starts its motion from rest under, the action of a constant force. If the distance, covered in first 10 s is s, and that covered in, the first 20s is s,, then {CBSE AIPMT 2009}, {a)s, =2s, (b) s, =3s,, , (c)s, = 4s, (d)s, =s,, , 13. A bus is moving with a speed of 10 ms~ on, 4 straight road. A scooterist wishes to, overtake the bus in 100 s. If the bus is ata, , distance of 1 km from the scooterist, with, what speed should the scooterist chase the, bus? (CBSE AIPMT 2009}, (a) 20ms"! (b) 40ms~, (c) 25ms"' (d) 10ms~*, , 14. A particle moves in a g, constant acceleration, Ppa A _, , velocity from 10 ms™ to 29 ms” while, , ssing through a distance 13, Feaedletoft's Sm int sec., , (1018 (te gg 2008), , cle shows distance-time curve a., - — in this figure. The maximum, frstantaneous velocity of the particle js, around the point [CBSE AIPM 2, , i a, A B, Time, (a8 (o)C ()D (A, , travelled by a particle starting, * pea amis with an acceleration, , 4a ird-second is, mein the thi [CBSE AIPMT 2008), , 10 19, (a) 6m (bo) 4m a7 @sm, , 17. A particle moving along x-axis has, sa { at time f, given by, , f=fo(i-£ , where f, and T are, , constants. The particle att = 0 has zero, velocity. In the time interval between t =0, and the instant when f = 0, the particle's, , velocity (v,) is (CBSE AIPMT 2007], a (3 gr, , 18. A car moves from X toY with a uniform, speed v, and returns to X with a uniform, speed vy. The average speed for this round, trip is [CBSE AIPMT 2007}, , @ 24% &) fae +, eo" Wuy ee ae, , 19. The position x of a particle w.r.t. time t, along x-axis is given by x=97? -¢3| where, xis in metre andt in sec, What will be the, position of this particle when it achieves, maximum speed along the + x direction?, , ICBSE AIPMT 2007}, (a) 32m —(b) 54m (c) 81m = (dd) 24m, 20. Two bodies A (of mass 1 kg) and B (of, , mass 3 kg) are dropped from heights of 16 m, and 25 m, respectively. The ratio of the time, , them to reach the ground is, (CBSE AIPMT, (a) -5/4 (0) 12/5 (ce) 5/12 (d) e

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21. The figure shows a logic circuit with tw., inputs A and B and the output C. The “°, voltage wave forms across A, B andc are, given. The logic circuit gate is as, , _ (CBSE Alp 2073), , , , , , , , , , , , , , , , , , , , , , , , , , , , c, , 4b & & & &, , (a) OR gate (b) NOR gate, (c) AND gate (d) NAND gate, , 22, Symbolic representation of four logic gates, are shown as [CBSE AIPMT 2011), , (i) —)>— (ii) [}—, Giii) > (iv) |p, , Pick out which ones are for AND, NAND, and NOT gates, respectively., , (a) (ili), (i) and (i) (b) (ii), () and (iv), , (c) (ii), (iv) and (iii) (9) (ii), (iii) and (iv), , 23. If a small amount of antimony is added to, germanium crystal [CBSE AIPMT 2011], (a) the antimony becomes an acceptor atom, (b) there will be more free electrons than holes in, the semiconductor, (c) its resistance is increased, (d) it becomes a p-type semiconductor, , 24. In forward biasing of the p-n junction, [CBSE AIPMT 2011], (a) the positive terminal of the battery is connected, to n-side and the depletion region becomes, thin, () the positive terminal of the battery is connected, as and the depletion region becomes, ic!, (c) the positive terminal of the battery is connected, — and the deplection region become, in, (d) the positive terminal of the battery is connected, — and the depletion region becomes, c

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25. Which one of the fol, false?, {a) Pure Si doped with trival, P-lype Semiconductor, , b) Majority carriers |, (b) —_ y Cartiers in a n-type semiconductor are, , (c) Minority carriers in a p-type » conduc!, pi YPe semi tor are, , (d) The fesistance of intrinsic Semiconductor, decreases with increase of ternperature., , 26. The device that can acy, electronic circuit is, {a) Junction diode, (b) Integrated circuit, (c) Junction transistor, (d) Zener diode, , lowing statement is, ICBSE AIPMT 2010], , He impurities gives a, , (as a complete, ICBSE AIPMT 2010], , 27. A common emitter amplifier has a voltage, gain of 50, an input impedance of 100 Q, and an output impedance of 200 Q, The, power gain the amplifier is, , (CBSE AIPMT 2010, 2007}, (b) 1000 = (c) 1250 (d) 50, 28. To get an output Y = 1 from the circuit, , shown below, the input must be, [CBSE AIPMT 2010], , a, , —, , (a) 500, , op >, , , , A, {a)O, (b) 0, (c)1, (01 0, , 29. Sodium has body centred packing., Distance between two nearest atoms is 3.7, , A. The lattice parameter is, {CBSE AIPMT 2009, 1999}, , (a)68A (b)43A (ch 3.0A (4) 86A, , 30. A transistor is operated in common-emitter, configuration at V, = 2 volt such that a, change in the base current from 100 pA to, 200 1A produces a change in the collector, current from 5 mA to 10 mA. The current, , Cc, 0, 1, 1, , cooo-wa, , gain is [CBSE AIPMT 2009], (a) 75 {b) 100, (c) 150 (d} 50, , 31. The symbolic representation of four logic, gates, , ac, « ———wi) —T—, wy ——_) >—, , The logic symbols for OR, NOT and NAND, gates are respectively (CBSE AIPMT 2009], (a) (il), (iv), (i) (b) (iv), (i), (iid), (c) (rv), (). (A) (i), (il, ev), 32. A p-n photodiode is fabricated from a, , semiconductor with a band gap of 2.5 eV., It can detect a signal of wavelength, , {CBSE AIPMT 2009], (a) 6000A (bb) 4000 nm (c) 6000 nm (d) 4000 A, , 33. The circuit is equivalent to, , , , , , , , , , , , {CBSE AIPMT 2008), NOR NAND NOT, (a) AND gate (b) NAND gate, (c) NOR gate (d) OR gate, , 34. A p-n photodiode is made of a material, with a band gap of 2.0 eV. The minimum, frequency of the radiation that can be, absorbed by the material is nearly, , [CBSE AIPMT 2008}, (a) 10 x 10"* Hz (b) 5x 10" Hz, (c) 1x 10" Hz (d) 20x 10° Hz, , 35. The voltage gain of an amplifier with 99, negative feedback is 10. The voltage gain, without feedback will be [CBSE AIPMT 2008), (a) 90 (b) 10 {c) 1,25 (d) 100, , 36. If the lattice parameter for a crystalline, structure is 3.6 A, then the atomic radius, in fcc crystals is [CBSE AIPMT 2008], (a)181A (b)210A (c)292A (ap 1.27A, , 37. For a cubic crystal structure which one of, the following relations indicating the cell, characteristic is correct? [CBSE AIPMT 20071, (a)a#b ec anda +f andy 490°, (b)aebecandazB =7=90°, ()a=b=candaefzy7= 90°, ()a=b=canda =f =7=%"

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+ In th, 1 ene, own TRY band diagram of a material, , citcler below, the open cireles and filled, ®note holes and electrons, , respectively, Tho material is afan, , (CBSE AIPMT 2007}, 5, , , , , , Ey, , (a) type serniconductor (b) insulator, , (c) metal (d) n-type semiconductor, 39. In the following circuit, the output Y for all, , possible inputs A and B is expressed by the, , truth table (CBSE AIPMT 2007}, , i, , , , , , U, , (QA BY ()A BY, 000 001, 010 011, 100 1014, 14 110, (JA BY (A BY, 001 000, 010 01.4, 100 101, 110 1141, , 40. The following figure shows a logic gate, circuit with two inputs A and B and the, output C. The voltage waveforms of A, B, and C are as shown below, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , te] “eee |__o, , mal Ld |, , : sete A OL ha, >t, , iF, , pt Wateaeigh Lait »t, md ., , 41,, , 42., , 43., , ey, , ‘The logic cireult gate le (CBSE Atpagy 2g,, (a) AND gate (b) NAND gate, {c) NOR gata . (d) OR gate, , A forward biased diode is (CBSE Aipyyy 2004) |, , () + ww, (by 24——+»}- ——-wr—_, (co) 2} 2, (a) Sp} ——r_—=2, , A transistor is operated in common emit,, configuration at constant collector yo}, , V, = 15 V such that a change in the base, current from 100 pA to 150 pA produces q, change in the collector current from 5, , to 10 mA. The current gain () is, , [CBSE AIPMT 2096,, (a) 67 (b) 75 (c) 100 (d) 50, A transistor-oscillator using a resonant, , circuit with an inductor L (of negligible, resistance) and a capacitor C in series, produce oscillations of frequency f. If Lis, doubled and C is changed to 4 C, the j, frequency will be [CBSE AIPMT 2005), f, , f f, £ f it, (a) 7 (b) 6 (c) aE 8;, 44. Copper has face-centered cubic (foc) lattice, , 45., , with interatomic spacing equal to 2.54 A., The value of lattice constant for this lattice, is [CBSE AIPMT 2005), , (a) 127A (b)5.08A (cy 254A (d) 3.594, , Choose only false statement from the, following [CBSE AIPMT 2005}, (@) Substances with energy gap of the order of, 10 eV are insulators, (b) The conductivity of a semiconductor increase’, with increases in temperature, (¢) In conductors the valence and conduction, bands may overlap, (d) The resistivity of a semiconductor increases, with increase in temperature |, , , , . Carbon, silicon and germanium atoms hat, , four valence electrons each, Their valent |, and conduction bands are separated by