NEET PHYSICS PAPER CODE : PP NEET-2018 ( ) PHYSICS

Size: px

Start display at page:

Download "NEET PHYSICS PAPER CODE : PP NEET-2018 ( ) PHYSICS"

Quentin Morgan
6 years ago
Views:

1 NEET PHYSICS PAPER CODE : PP NEET-8 (6-5-8) PHYSICS Q. An e wave is propagating in a ediu with a Ans. () velocity v v î. The instantaneous oscillating electric field of this e wave is along +y axis. Then the direction of oscillating agnetic field of the e wave will be along. () z direction () +z direction (3) y direction (4) x direction Direction v is decided by EB u LI 3 u 5 L I H (6 ) Q.4 An object is placed at a distance of 4 c fro a concave irror of focal length 5 c. If the object is displaced through a distance of c towards the irror, the displaceent of the iage will be : () 3 c away the irror () 36 c away fro the irror (3) 3 c towards the irror (4) 36 c towards the irror Ans. () V EB B kˆ Q. The refractive index of the aterial of a pris is and the angle of the pris is 3º. One of the two refracting surfaces of the pris is ade a irror inwards, by silver coating. A bea of onochroatic light entering the pris fro the other face will retrace its path (after reflection fro the silvered surface) if its angle of incidence on the pris is : () 6º () 45º (3) 3º (4) Zero Ans. () r (for retracing) A r + r r 3º Applying snell's law sin i sin 3º Applying v u f u 4 V 4 c Now u v (i) v v 6...(ii) 5 Fro () & () Iage oves 36 c away fro irror Q.5 In the cobination of the following gates the output Y can be written in ters of inputs A and B as sin i i 45º Q.3 The agnetic potential energy stored in a certain inductor is 5 J, when the current in the inductor is 6 A. This inductor is of inductance : ().38 H () H (3).389 H (4) 3.89 H Ans. () () A.B () A.B A.B (3) A.B A.B (4) A B y AB AB (XOR gate) (A B) Add. : 638, CAD Circle, Kota, Raj., India

2 NEET PHYSICS PAPER CODE : PP NEET-8 (6-5-8) Q.6 In the circuit shown in the figure, the input voltage V i is V, V BE and V CE. The values of I B, I C and are given by I F (A) T T T T V (volt) R V (volt) F T T I R (A) () I B 4 A, I C A, 5 () I B 5 A, I C 5A, (3) I B A, I C 5A, 5 (4) I B 4 A, I C 5A, 5 Fro KVL at input side. V R B I B V BE (5 K) I B & I B 5k 4A fro KVL at output side - (4k) I C I C 4k 5A I C IB 5A 5 4A Q.7 In a p-n juction diode, change in teperature due to heating () affects only reverse resistance () affects only forward resistance (3) does not affect resistance of p-n junction (4) affects the overall V I characteristics of p-n junction It affects all the P N diode characteristics. Because, teperature increase, increases reverse saturation current ; Decreases Barrier, & Reverse Breakdown voltage also increases as we increase teperature Affects overall. V-I characteristics of P N junction. Q.8 A sall sphere of radius 'r' falls fro rest in a viscous liquid. As a result, heat is produced due to viscous force. The rate of production of heat when the sphere attains its terinal velocity, is proportional to :- () r 3 () r (3) r 5 (4) r 4 Ans. (3) Rate of heat produced F v v terinal F 6 r v v vt r t Rate of heat produced r 5. Q.9 A saple of. g of water at C and noral pressure (.3 5 N ) requires 54 cal of heat energy to convert to stea at C. If the volue of the stea produced is 67. cc, the change in internal energy of the saple, is :- () 4.3 J () 8.7 J (3) 4. J (4) 84.5 J Ans. () Q W + U U Q W W P(v f v ) 67 W T U U 8.7J Add. : 638, CAD Circle, Kota, Raj., India

3 NEET PHYSICS PAPER CODE : PP NEET-8 (6-5-8) Q. Two wires are ade of the sae aterial and have the sae volue. The first wire has crosssectional area A and the second wire has crosssectional are 3A. If the length of the first wire is increased by l on applying a force F, how uch force is needed to stretch the second wire by the sae aount? () 9 F () 6 F (3) 4 F (4) F fro Hook's Laws F YA or F A F A F (3A) YA YA V f f 9 f 9f Q. The power radiated by a black body is P and it radiates axiu energy at wavelength,. If the teperature of the black bodyis now changed so that it radiates axiu energy at Q. A set of 'n' equal reistors, of value 'R' each, are connected in series to a battery of ef 'E' and internal resistance 'R'. The current drawn is I. Now, the 'n' resistors are connected in parallel to the sae battery. Then the current drawn fro battery becoes I. The value of 'n' is () () (3) (4) 9 E nr R E R R n For () & () n E (n )R nr (n )R...()...() Q.3 A battery consists of a variable nuber 'n' of identical cells (having internal resistance 'r' each) which are connected in series. The terinals of the battery are short-circuited and the current I is easured. Which of the graphs shows the correct relationship between I and n? 3 wavelength, the power radiated by it 4 becoes np. The value of n is :- () () () 3 4 () 4 3 (3) 56 8 Ans. (3) As lt const. (4) 8 56 (3) (4) T C 4C, T 3 Power Radiated (P) T 4 P Coparing C P P 8 56 ; P 56 8 P ne nr E r Currrent I is independent of nuber of cells 'n' hence n 56 8 Add. : 638, CAD Circle, Kota, Raj., India 3

4 NEET PHYSICS PAPER CODE : PP NEET-8 (6-5-8) Q.4 A carbon resistor of (47 ± 4 7) k is to be arked with rings of different colours for its identification. The colour code sequence will be () Violet Yellow Orange Silver () Yellow Violet Orange Silver (3) Yellow Green Violet Gold (4) Green Orange Violet Gold Ans. () R (47 ± 4.7) k (47 ± 47) (47 3 ± %) Q.7 A body initially at rest and sliding along a frictionless track fro a height h (as shown in the figure) just copletes a vertical circle of diaeter AB D. The height h is equal to () 3 D () D (3) 7 5 D (4) 5 4 Q.5 W hich one of the following stateents is incorrect? () Rolling friction is saller than sliding friction. () Liiting value of static friction is directly proportional to noral reaction. (3) Frictionless force opposes the relative otion. (4) Coefficient of sliding friction has diensions of length. Coefficient of sliding friction is diensionless Q.6 A oving block having ass, collides with another stationary block having ass 4. The lighter block coes to rest after collision. When the initial velocity of the lighter block is v, then the value of coefficient of restitution(e) will be () 5 () 5 (3) 8 (4) 4 Ans. () v Fro COLM 4 v v 4v' v' 4 v' v / 4 e.5 v v 4 To coplete verticle circle iniu velocity required at fro of circle is So by conservation of energy gh v r D gh 5g D h 5D 4 5gr Q.8 Three objects, A : (a solid sphere), B : (a thin circular disk) and C : (a circular ring), each have the sae ass M and radius R. They all spin with the sae angular speed about their own syetry axes. The aounts of work (W) required to bring the to rest, would satisfy the relation () W C > W B > W A () W A > W B > W C (3) W B > W A > W C (4) W A > W C > W B Fro work energy theore, to stop the syste w ext wext I I I I C B A w w w C B A Add. : 638, CAD Circle, Kota, Raj., India 4

5 NEET PHYSICS PAPER CODE : PP NEET-8 (6-5-8) Q.9 A tuning fork is used to produce resonance in a glass tube. The length of the air colun in this tube can be adjusted by a variable piston. At roo teperature of 7 C two successive resonances are produced at c and 73 c of colun length. If the frequency of the tuning fork is 3 Hz, the velocity of sound in air at 7 C is : () 33 /s () 339 /s (3) 35 /s (4) 3 /s Ans. () c V f 3 (53 ) 339. Q. An electron falls fro rest through a vertical distance h in a unifor and vertically upward directed electric field E. The direction of electric field is now reversed, keeping its agnitude the sae. A proton is allowed to fall fro rest in it through the sae vertical distance h. The tie of fall of the electron, in coparison to the tie of fall of the proton is () saller () 5 ties greater (3) ties greater (4) equal For electron a e E e + g Q. A pendulu is hung fro the roof of a sufficiently Ans. () high building and is oving freely to and fro like a siple haronic oscillator. The acceleration of the bob of the pendulu is /s at a distance of 5 fro the ean position. The tie period of oscillation is () s () s (3) s (4) s a w x w 5 w T sec w Q. The electrostatic force between the etal plates of an isolated parallel plate capacitor C having a charge Q and area A, is () independent of the distance between the plates. Force () linearly proportional to the distance between the plates. (3) proportional to the square root of the distance between the plates. (4) inversely proportional to the distance between the plates. Q A Force is independent of seperation d. for proton ee a p + g p t h a because a e > a p So t e < t p Q.3 An electron of ass with an initial velocity V Vˆ i (V > ) enters an electric field E Eˆ i (E constant > ) at t. If is its de-broglie wavelength initially, then its de-broglie wavelength at tie t is ee () () ee t V t V (3) t (4) Add. : 638, CAD Circle, Kota, Raj., India 5

6 NEET PHYSICS PAPER CODE : PP NEET-8 (6-5-8) v ˆ i Eˆ i v v v ee t h ee t h (v eet) ee t v Q.4 For a radioactive aterial, half-life is inutes. If initially there are 6 nuber of nuclei, the tie taken (in inutes) for the distintegration of 45 nuclei is () () (3) 3 (4) 5 Half life inutes, so t/ t/ Total tie half life in. Q.5 When the light of frequency (where is threshold frequency), is incident on a etal plate, the axiu velocity of electrons eitted is v. When the frequency of the incident radiation is increased to 5v, the axiu velocity of electrons eitted fro the sae plate is v. The ratio of v to v is : () : () : 4 (3) 4 : (4) : Fro Einstein equation h h + v h v...() If frequency is increased to 5 then 5h h + v Q.6 The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen ato, is () : () : (3) : (4) : Ans. () In Hydrogen ato fro Bohr's postulates T E KE K E : T E Q.7 The oent of the force, F 4i ˆ 5j ˆ 6kˆ at (,, 3), about the point (,, ) is given by () 8i ˆ 4j ˆ 7kˆ () 4i ˆ ˆj 8kˆ (3) 7i ˆ 8j ˆ 4kˆ (4) 7i ˆ 4j ˆ 8kˆ r F (i ˆ j ˆ k) ˆ (4i ˆ 5j ˆ 6k) ˆ 7i ˆ 4j ˆ 8kˆ Q.8 A block of ass is placed on a sooth inclined wedge ABC of inclination as shown in the figure. The wedge is given an acceleration 'a' towards the right. The relation between a and for the block to reain stationary on the wedge is () a g cosec () a g sin (3) a g cos (4) a g tan 4h 8h...() fro () & () h v v 8h v v Fro wedge reference frae For block to be at rest a cos g sin a g tan Add. : 638, CAD Circle, Kota, Raj., India 6

7 NEET PHYSICS PAPER CODE : PP NEET-8 (6-5-8) Q.9 A toy car with charge q oves on a frictionless Ans. () horizontal plane surface under the influence of a unifor electric field E. Due to the force qe, its velocity increases fro to 6 /s in one second duration. At that instant the direction of the field is reversed. The car continues to ove for two ore seconds under the influence of this field. The average velocity and the average speed of the toy car between to 3 second are respectively () /s, 4 /s () /s, 3 /s (3) /s, 3 5 /s (4) 5 /s, 3 /s Q.3 A student easured the diaeter of a sall steel ball using a screw gauge of least count c. The ain scale reading is 5 and zero of circular scale division coincides with 5 divisions above the reference level. If screw gauge has a zero error of 4 c, the correct diaeter of the ball is () 5 c () 55 c (3) 53 c (4) 59 c Reading MSR + (n LC) + zero error.5 + (5.) c Q.3 Unpolarised light is incident fro air on a plane surface of a aterial of refractive index ''. At a particular angle of incidence 'i', it is found that the reflected and refracted rays are perpendicular to each other. Which of the following options is correct for this situation? () Reflected light is polarised with its electric vector parallel to the plane incidence () Reflected light is polarised with its electric vector perpendicular to the plane of incidence between t to t s v u + at 6 + a a 6 /s average speed total distance total tie 3X 3 X /s where X + 6 () 3 average speed 3 /s average velocity total displaceent total tie X /s (3) i sin (4) i tan Ans. () By theory Q.3 In Young's double slit experient the separation d between the slits is, the wavelength of the light used is 5896Å and distance D between the screen and slits is c. It is found that the angular width of the fringes is. To increase the fringe angular width to (with sae and D ) the separation between the slits needs to be changed to () 8 () 9 (3) (4) 7 Ans. () Angular fringe width d. d... d d.9 Add. : 638, CAD Circle, Kota, Raj., India 7

8 NEET PHYSICS PAPER CODE : PP NEET-8 (6-5-8) Q.33 An astronoical refracting telescope will have large angular agnification and high angular resolution, when it has an objective lens of () sall focal length and large diaeter () large focal length and sall diaeter (3) large focal length and large diaeter (4) sall focal length and sall diaeter Ans. (3) Q.35 The fundaental frequency in an open organ pipe is equal to the third haronic of a closed organ pipe. If the length of the closed organ pipe is c, the length of the open organ pipe is : () 3c () 8c (3) 5 c (4) 6 c f fe. d Q.34 The volue (V) of a onoatoic gas varies with its teperature (T), as shown in the graph. The ratio of the work done by the gas, to the heat absorbed by it, when it undergoes a change fro state A to State B, is V A B Open O.P. f v closed O.P. f 3 f f 3 v v v 4 T c () 5 () 3 (3) 3 (4) 7 Q.36 The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is () 68% () % (3) 65% (4) 5% v v B T L % n carnet T H v A T T In their process P constant Work done P(v v ) nr(t T ) nr T Q nc p T Ratio w Q 5 T 5 Q n R T % 373 Q.37 At what teperature will the rs speed of oxygen olecules becoe just sufficient for escaping fro the Earth's atosphere? (Given : Mass of oxygen olecule ().76 6 kg, Boltzann's constant k B.38 3 JK ) () 4 K () K (3) 56 4 K (4) 54 4 K Ans. () V rs 3KT V rs should be equal to escape speed. 3 T K 3KT Add. : 638, CAD Circle, Kota, Raj., India 8

9 NEET PHYSICS PAPER CODE : PP NEET-8 (6-5-8) Q.38 A etallic rod of ass per unit length 5kg is lying horizontally on a sooth inclined plane which akes an angle of 3 with the horizontal. The rod is not allowed to slide down by flowing a current through it when a agnetic field of induction 5 T is acting on it in the vertical direction. The current flowing in the rod to keep it stationary is () 74A () 598A (3) 476A (4) 3A To reain at rest l lg sin 9 ilb cos 3 i gsin3 Bcos3 Q.4 A thin diaagnetic rod is placed vertically between the poles of an electroagnet. When the current in the electroagnet is switched on, then the diaagnetic rod is pushed up, out of the horizontal agnetic field. Hence the rod gains gravitational potential energy. The work required to do this coes fro () the current source () the agnetic field (3) the lattice structure of the aterial of the rod (4) the induced electric field due to the changing agnetic field Due to the agnetic field generated by current in electroagnet rod experience force and gain potential energy and source of this energy is current source. i (4).3 A Q.39 An inductor H, a capacitor F and a resistor 5 are connected in series across a source of ef, V sin 34 t. The power loss in the circuit is () 79 W () 43 W (3) 74 W (4) 3 W Z R (X X ) L C R 5 X L L X C Z C (5) (5.56) 56.5 P V r I r cos V 5 r Z R.79 W (56.5) Q.4 Current sensitivity of a oving coil galvanoeter Ans. (3) is 5 div/a and its voltage sensitivity (angular deflection per unit voltage applied) is div/v. The resistance of the galvanoeter is : () 4 () 5 (3) 5 (4) 5 Voltage per division V Current per division R I V A Q.4 If the ass of the Sun were ten ties saller and the universal gravitational constant were ten ties larger in agnitude, which of the following is not correct? () Raindrops will fall faster. () Walking on the ground would becoe ore difficult (3) Tie period of a siple pendulu on the Earth would decrease (4) 'g' on the Earth will not change. Add. : 638, CAD Circle, Kota, Raj., India 9

10 NEET PHYSICS PAPER CODE : PP NEET-8 (6-5-8) If universal constant becoes ties, then on earth surace GM g R GM g' R So g on earth surface will charge G' G g' g Q.43 A solid sphere is in rolling otion. In rolling Ans. () otion a body possesses translational kinetic energy (K t ) as well as rotational kinetic energy (K r ) siultaneously. The ratio K t : (K t + K r ) for the sphere is : () 7 : () 5 : 7 (3) : 7 (4) : 5 Q.45 A solid sphere is rotating freely about its syetry axis in free space. The radius of the sphere is increased keeping its ass sae. Which of the following physical quantities would reain constant for the sphere? () Angular velocity () Moent of inertia (3) Rotational kinetic energy (4) Angular oentu As t ext Angular oentu will reain conserve. K T KT K R v v v 5 v 7 v MR 5 R Q.44 The kinetic energies of a planet in an elliptical orbit about the Sun, at positions A, B and C are K A, K B and K C, respectively. AC is the ajor axis and SB is perpendicular to AC at the position of the Sun S as shown in the figure. Then B A S C () K A < K B < K C () K A > K B > K C (3) K B < K A < K C (4) K B > K A > K C Ans. () As angular oentu is conserved vr constant so v A > v B > v C hence K A > K B > K C Add. : 638, CAD Circle, Kota, Raj., India

AIPMT / NEET (Physics, Chemistry and Biology) Code A/P/W. Time: 3 hrs Total Marks: 720

AIPMT / NEET (Physics, Chemistry and Biology) Code A/P/W. Time: 3 hrs Total Marks: 720 AIPMT / NEET - 06 (Physics, Cheistry and Biology) Code A/P/W Tie: hrs Total Marks: 70 General Instructions:. The Answer sheet is inside this Text booklet. When you are directed to open the text booklet,