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4. For a p-type semiconductor, which of the, following statements is true ?, , (a) Holes are the majority cartiers and trivalent, atams are the dopants,, , {b) Holes are the majority Carriers and pentavalent, atoms are the dopants, m, , {c) Electrons are the Majority carriers and, pentavalent atoms are the dopants,, , (d) Blectrons are the, , Majority carriers and trivalent, atoms are the dopants., , 2, Abody weighs 200 N on the surface of the, earth. How much will it w., , cigh half way, down to the centre of the earth ?, (a) 200 N, , (b} 250N — (c) 100'N (@) 150 N, , In which of the following processes, heat is, neither absorbed nor released by a system?, (a) Adiabatic (b) Isobaric, , {c} lsachoric (9) lsothermat, , . Six similar bulbs are connected as shown in, the figure with a DC source of emf E and zero, internal resistance., , The ratio of power consumption by the bulbs, when (i) all are glowing and (ii} in the, situation when two from section A and one, from section B are glowing, will be, , <, , A 8, , aL, , Uy, , git, fy, , E, (1:2 2:1, , , , (a)o:4 (4:9, , 5., , 8. When an obj, , Tita ole of arca of cross-section 2 mm? is, <a oon the bottom of a fully filled open, right 2m., bra sy 10 m/s’, the rate of flow of water, through the open hole would be nearly, (a) 89 x 10m 4/s, (b)2.23x 10% m/s, {c) G4 x 10° m/s, (d) 12.6 x 10° m/s, , A force F = 20 +10¥ acts on a particle in, , y-direction, where F is in newton and y in, meter., , Work done by this force to move the particle, from y=0 10 y=I mis, fa) 5d, , (b) 25 J, {c) 20d, , {d) 30.5, , Two point charges A and B, having charges, +Qand —Q respectively, are placed at certain, distance apart and force acting between them, is F,, , If 25% charge of A is transferred to B, then’, force between the charges becomes, , oF 1GF, (a) i 6 {b) i, {e) a (d) F, , ject is shot from the bottom of a, long smooth inclined plane kept at an angle, 60" with horizantal, it can travel a distance x,, along the plane, But when the inclination is, decreased to 30° and the same object is shot, with the, , same velocity, it can travel X, distance., Then x, 3x, will be, , (a) V2.1 b) 1: V3, {c) 1:2. V3 i, , (A) 1:2

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10., , 11., , 12., , 13., , 14., , Pick the wrong answer in the context with, , rainbow., , {a) The order of colours is reversed in the secondary, rainbow, , (b) An observer can see a rainbow when his front is, towards the sun, , (c) Rainbow is a combined effect of dispersion, refraction and reflection of sunlight, , (d) When the light rays undergo two internal, reflections in a water Grop, a secondary tainbow, is formed, , Average velocity of a particle executing SHM, in one complete vibration is, , {ajAw (b) a. {c) zero Aw, , a, , The total energy of an electron in an atom in, an orbit is -3.4 eV., , Its kinetic and potential energies are,, respectively:, , (a) -3.4 eV, -6.8 eV, (c) 3.4 eV, 3.4 eV, , (b) 3.4 eV, -6.8 eV, (d) -3.4 eV, -3.4 eV, , Ata point A on the earth’s surface the angle, , of dip, 5 = +25°., , Ata point B on the carth’s surface the angle, , of dip, 5 = -25°., , We can interpret that, , (a) Ais located in the southern hemisphere and Bis, located in the northern hemisphere., , (b) Ais located in the northern hemisphere and Bis, located in the sauthem hemisphere., , (c) A and 8 are both located in the southern, hemisphere., , (d) A and B are both located in the northern, hemisphere., , In which of the following devices, the eddy, current effect is not used?, , {a) Magnetic braking in train, , (b) Electromagnet, , (c) Electric heater, , (d) Induction furnace, , Two particles A and Bare moving in uniform, circular motion in concentric circles of radii r,, and f, with speed v, and v, respectively,, ‘Their time period of rotation is the same. The, , atio of angular speed of A to that of B will be, rae (0) yf, (a) Ya 78 O) 4%, , (co) 1:4, , 15., , 17., , 18., , 19., , Two similar thin equieconves lenses, of foes, length f each, are kept co axially it contac, with each other such that the foval length of, the combination is fF., , When the space between the two lenses js, filled with glycerine (which has the same, refractive index (pts L9) as that of glass) they, the equivalent foval length is F,, , The ratio BF, will be, , (a) 1:2 {b) 2.3 {cy 3.4, , (dj?, , An electron is accelerated through a potentiat, difference of 10,000 V,, , Its de-Broglic wavelength is, (nearly):, , gn, =9 x10" ke), , (a) 122 x10"%m (b) 122 x 10""m, , , , , , (c) 122 nm (d) 122 x 10%"m, t 46, b =A, At —" hoe, 0 #, Bi ¥, , The correct Boolean operation represented by, the circuit diagram drawn is, , (a) OR (b) NAND = (c) NOR (d) AND, , A soap bubble, having radius of 1 mm, is, blown from a detergent solution having a, surface tension of 25 x 107 N/m., , The pressure inside the bubble equals at a, point Z,below the free surface of water ina, container., , Taking g =10 m/s’, density of water, =10’kp/m’, the value of Z, is, , {a) 10cm {b) tem, (c) 0.5em - (a) 100 cm, , The displacement of a particle executing, simple harmonic motion is given by, y= At Asinol+ Beosa@ +, , 4 , op 1 4 ven, Then the amplitude of its oscillation is gl, , ty =. _——(a) VAP + 8 (by (A + (A+ BF, (c)A+8 (a Ae VA HB

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The work done to raise a mass yy from the, surface of the carth toa height 4, which is, equal to the radius of the earth, is is, , (o) mgr, , ayomgR 3, mene (co) Sgr (d) mgR, , 21. The speed of a swimmer in still water is, , 20 ns. The speed of river water a0 os, , js flowing due east. If he is standin uy py, , south bank and wishes to cross the river 2, along the shortest path the angle at vik ‘, should make his strokes w.r.t Ti vhic he, given by . “, (a), (c) 45° west, , (b) 60" west, (d) 30° west, , 22. Two parallel infinite line charges with linear, charge densities +4 C/m and -A C/m are, .placed at a distance of 22 in free space., What is the electric field mid-way between, the two line charges?, 2)., , — NIC, o it, , a, (c) ine A N/C, , 4, i) ioe, OA NIC, , (d) Zero, , 23. Which of the following acts as a circuit, protection device?, , (a) Inductor, (c) Fuse, , (b) Switch, (d) Conductor, , 24. A parallel plate capacitor of capacitance 20pF, di by a voltage source whose, potential is changing at the rate of 3 Wis., , The conduction current through the, connecting wires and the displacement, , current through the plates of the capacitor,, would be, respectively., , is being charge, , zero, , (a) GOA, GOWA (b) 60H,, (c) zero, zero (d) zero, 60, , Mis suspended bya, , 25. When a block of mass, long wire of length L, t, , becomes (L + /)- di, The clastic potential encreY stare, extended wire is, , (a) Mal, 1, (c) 5 Mol, , he length of the wire, , in the, 1, , 5 Mg!, , (d) Ma!, , 26., , 27., , 28, , 29., , 30., , 31., , A hollow metal sphere of radius R is, , uniformly charged., , The electric field due to the sphere at a, , distance r from the centre, , (a) zero as + increases for r<A, decreases as 1, increases forr > R, , (b) zero as ¢ increases for r< A, increases as s, increases forr > R, , (c) decreases as r increases for r < Rand forr>R, , (d) increases as r increases forr < R and forr > R, , A mass mis attached to a thin wire and, whirled in a vertical circle., , The wire is most likely to break when:, (a) the wire is horizontal, , (b) the mass is at the lowest point, , {c) inclined at an angle of 60° from vertical, {d) the mass is at the highest point, , Which colour of the light has the longest, wavelength?, {a) Blue, {c) Violet, , {b) Green, (d) Red, , A particle moving with velocity v is acted by, three forces shown by the vector triangle POR., The velocity of the particle will, , P, , R Q, (a) decrease, (b) remain constant, {c) change according to the smallest force QR, (d) increase, , lonised hydrogen atoms and « -particles with, same momenta enters perpendicular to a, constant magnetic field, B., , The ratio of their radii of their paths , : 1%, will be, , (a) 1:2 (b) 4:4, , (oc) 1:4 (d)2:1, , The unit of thermal conductivity is :, (a) Jr" K* (bo) WmK*, (c) Wm" Kk” (d) JmK"

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32, , 35., , A coil of 800 turns effective area 0.05 m* is, kept Perpendicular to a magnetic field, , 5 *10° T. When the plane of the coil is, rotated by 90° around any of its co-planar axis, in 0.1 s, the emf induced in the coil will be, {ajO2V fb)2 410° V, , {c) 0.02 ¥ (jj2Vv, , A disc of radius 2 m and mass 100 kg rolls on, , a horizontal floor, Its centre of mass has, speed of 20 cm/s. How much work is needed, to stop it?, (a) 30 Kd, (c) 1J, , (b) 25, (d) 3J, , In an experiment, the percentage of error, , occurred in the measurement of physical, , quantities A, B,C and D are 1%, 2%, 3% and, , 4% respectively. Then the maximum, , percentage of error in the measurement X,, 2p?, , where, X = elite will be, , cp, , (a) 16% (b)-10% (c) 10%, , a}, |= &, Body A of mass 4m moving with speed u, collides with another body B of mass 2m, at, rest. The collision is head on and elastic in, nature. After the collision the fraction of, energy lost by the colliding body A is, , 8 4 5 1, = = = id) —, (a) 5 (b) 3 (c) 5 (a) 5, , 36. The radius of circle, the period of revolution,, , initial position and sense of revolution are, indicated in the below fig., , , , y-projection of the radius vector of rotating, part icle P is, , ca) yt) = 48) where yin’, , wyn= og) omen, , (a, , ost t where yin im, , , , {c) yt) =, , 12, (0) y@) = ~Scos2rt, where yinm, , 37. In total internal reflection when the angi. of, , incidence is equal to the critical angle fo, the, pair of media in contact, what will be angle, of refraction?, , (a) 0°, , (b) Equal to angie of incidence, , (c) 90°, , (d) 180°, , 38. A solid cylinder of mass 2 kg and radius 4 er,, , is rotating about its axis at the rate of 3 rpm,, The torque required to stop after 27, , revolutions is, (a)2 x 10° N-m, (c)2 « 10° N-m, , (b) 12 x 10% N-m, (d)2x 10% N-m, , 39. A block of mass 10 kg is in contact against the, , inner wall of a hollow cylindrical drum of, radius 1 m. The coefficient of friction between *, the block and the inner wall of the cylinder is, 0.1. The minimum angular velocity needed for, the cylinder to keep the block stationary when, the cylinder is vertical and rotating about its, axis, will be (g =10 m/s* ), , (a) 10 rad/s (b) 10 rad/s, 2n, (c) 10n rad/s (¢) V0 rad/s, , 40. A cylindrical conductor of radius R is carrying, , a constant current. The plot of the magnitude, of the magnetic field B with the distance d, from the centre of the conductor, is correctly, represented by the figure, , B 8, , (a) (b), , (c)

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41. Two masses M, =5 kg, M, = 10 kg are, connected at the ends of an inextensible, string passing over a frictionless pulley as, shown. When masses are released, then, acceleration of masses will be, , [CBSE AIPMY 2000], , My, Mp, , dia, g g g, (alg (b) r (c) : (d) :, , 42. A ball of mass 3 kg moving with a ,,, speed of 100 m/s, strikes a wall at, an angle 60° (as shown in figure)., The ball rebounds at the same, speed and remains in contact O°, with the wall for 0.2 s, the force, exerted by the ball on the wall is, , 60", , [CBSE AIPMT 2000], (a) 1500 V3 N (b) 1500 N, (c) 300 3 N (d) 300 N, , 43. The force on a rocket moving with a, velocity 300 m/s is 210 N. The rate of, consumption of fuel of rocket is, , [CBSE AIPMT 1999}, (a) 0.7 kgis (b) 1.4 kg/s, (c) 0.07 kgls (d) 10.7 kg/s, , 44, A 5000 kg rocket is set for vertical firing., The exhaust speed is 800 ms“'. To give an, initial upward acceleration of 20 m/s*, the, amount of gas ejected per second to supply, the needed thrust will be (g =10 ms™), , [CBSE AIPMT 1998}, (a) 127.5 kg (b) 187.5 kg s™', (c) 185.5 kg s! (d) 137.5 kgs, , 45. A bullet is fired from a gun. The force on, the bullet is g%en by, , F =600-2x10°¢, , i ‘ nd. The, where, F is in newton and f in seco son as, , force on the bullet becomes zero 46 <a, , it leaves the barrel. What ate ave ;, impulse imparted to the bulle™’ 1998:, " , ycese A Nes, , fa)8N-s (bo) Zero | 09N®