CODE C-4. KCET 2016 TEST PAPER WITH ANSWER KEY (HELD ON THURSDAY 5 th MAY, 2016) PHYSICS (1) (3) mr. Ans: (1) (1) (3) Ans: (2) (1) eq ax

Transcription

1 . galvanometer coil has a resistance of 5 W and the meter shows full scale deflection for a current of 5 m. This galvanometer is converted into voltmeter of rance - V by connecting 5 W in parallel with galvanometer () 95 W in parallel with galvanometer () 5 W in series with galvanometer () 95 W in series with galvanometer. For what distance is ray optics is good approximation when the aperture is mm and the wavelength of light is h m? m () 8 m () m () m. In the cyclotron, as radius of the circular path of the charged particle increases ( w = angular velocity, v = linear velocity) v increases, w decreases () v increases, w remains constant () w only increases, v remains constant () both w and v increases ns: (). Focal length of a convex lens is cm and its RI is.5. it produces and erect, enlarged image if the distnace of the object from the lens is cm () 5 cm () cm () cm ns: () KCET 6 TEST PPER WITH NSWER KEY (HELD ON THURSDY 5 th MY, 6) 5. Variation of resistnace of the conductor with temperature is as shown PHYSICS The temperature co - efficient ( a ) of the conductor is m R () mr () () mr R m 6. The rms value of current in a 5 Hz C circuit is 6. The average value of C current over a cycle is () p p 6 ns: () () Zero () 6 7. The componenet of a vector r along x - axis will have a maximum value if r makes an angle of 5 with the x - axis () r is along - ve y - axis () r is along +ve y - axis () r is along +ve x - axis 8. If E and E ax eq represents electric field at a point on the axial and equatorial line of a dipole. If points are at a distance r from the centre of the dipole, for r>>a E = E E =-E eq ax E =-E () ax eq ns: () () ax eq E = E () ax eq 9. spring is stretched by applying a load to its free end. The strain produced in the spring is Longitudinal () Longitudinal & Shear () Shear () Volumetric ns: ()

2 . Effective resistnace between and B in the following circuit. Potential difference between and B in the following circuit W () 5W () W () W. t certain place, the horizontal component of earth s magnetic field is. G and the angle dip at that place is. The magnetic field of earth at that location 6. G ().5 G () 5. G ().5 G ns: (). Maximum acceleration of the train in which a 5 kg box lying on its floor will remain stationary (Given : Co - efficient of static friction between the box and the train s floor is. and g = ms - ) 5ms - ().5ms - ().ms - () 5.ms -. capacitor of capacitance m F is connected to an C Source and an C mmeter. If the source voltage varies as V= 5 sin t, the reading of the ammeter is 7.7 m () 5. m () 7.7 m () 5 m 6V ().8 V () 5.6 V () V 5. plane galss plate is placed over a various coloured letters (violet, green, yellow, red). The letter which appears to raised more Violet () Green () Yellow () Red 6. In a series L.C.R cirucit, the potential drop across L, C and R respectively are V, V and 6 V. Then the source voltage is V () 8 V () 6 V () V 7. n ideal fluid flows through a pipe of circular cross section with diameters 5 cm and cm as shown. The ratio of velocities of fluid at and B is : () : () : () : 8. body falls freely for sec. Its average velocity during this journey (take g = ms - ) 5 ms - () 5 ms - () ms - () ms - ns: ()

3 9. Identify the logic operation carried out by the following circuit OR () NOR () NND () ND. Total energy of electron in an excited state of hydrogen atom is -. ev. The kinetic and potential energy of electron in this state K = +. ev U = -.6 ev () K = -6.8 ev U = +. ev () K =. ev U = ev () K = -. ev U = -6.8 ev. ray of light suffers a minimum deviation when incident on an equilateral prism of refractive index. The angle of incidence is 5 () 6 () 5 (). particle of mass gm and cahrge m Cis held at rest on a frictionless horizontal surface at distance m from the fixed charge mc. If the particle is released, it will be repelled. The speed of the particle when it is at a distance of m from the fixed charge 8 ms - () 9 ms - () ms - () 6 ms -. Two heating coils of resistnaces W and W are connected in parallel and connected to a battery of emf V and internal resistance W. The power consumed by them are in the ratio : () : () : () : ns: (). radio - active sample of half - life days contains x nuclei. Number of original nuclei present after 5 days is 5 x () 5 x () 75 x () 77 x 5. In young s double slit experiment the source is white light. One slit is covered with red filter and the other with blue filter. There shall be No interference () lternate dark & yellow fringes () lternate dark & pink fringes () lternate red & blue fringes 6. In a transistor, the collector current varies by.9 m and emitter current varies by.5 m. Current gain b measured is () 99 () 5 () 9 7. wheel with spokes each of length L m is rotated with a uniform angular velocity ' w ' in a plane normal to the magnetic field B. The emf induced between the axle and the rim of the wheel Nw BL () wbl () BL w () N BL w 8. Four rods with different radii r and length l are used to connect two heat reservoirs at different temperature. Which one will conduct most heat? r = cm, l = m () r = cm, l = m () r = cm, l = m () r = cm, l = m 9. Mobiity of free electrons in a conductor is Inversely proportional to relaxation time. () Inversely proportional to electron density () Directly proportional to relaxation time () Directly proportional to electron density

4 . conducting write carrying current is arranged as shown. The magnetic field at O. In the following network potential at O; () È + 6 ÍR R mi Í mi È + ÍR R () () È - 6 ÍR R mi Í mi È - ÍR R. proton is porjected with a uniform velocity v along the axis of a current carrying solenoid, The proton will continue to move with velocity v along the axis. () The proton move along helical path () The proton path will be circular about the axis () The proton will be accelerated along the axis. In a series L.C.R circuit an alternating emf (v) and current (i)) are given by the equation v = v Ê ˆ sinw t,i = i sin Áw+ t p ÁË The average power discipated in the circuit over a cycle of C is Zero () vi.8 V () 6 V () V () V. Electromagnetic radiation used to sterilise milk is Radiowaves () UV rays () g - ray () X - ray ns: () 5. x and x are susceptibility of a paramagnetic material at temperatures TK and TKrespectively, x T = x T () xt = xt () xt xt = () x= x 6. nucleus of mass u emits a g photon of energy 6 MeV. If the emission assume to occur when nucleus is free and rest, the nucleus will have kinetic energy nearest to (take u =.6-7 kg) KeV (). KeV () KeV () KeV 7. Which of the points is likely position of the centre of mass of the system shown in the figure () vi () vi C ()D ()B ()

5 8. The de Broglie wavelength of an electron accelerated to a potential of V is approximately.6 nm (). nm (). nm (). nm 9. Four metal plates are arranged as shown. Capacitance between X and Y ( Æ rea of each plate, d Æ distance between the plates) () ns: () Œ d Œ d () () Œ d Œ d. kg bomb at rest explodes into two pieces of kg and 8 kg. If the momentum of kg piece is Ns, the kinetic energy of the 8 kg piece is J () 5 J () J () 5 J. If there are only one type of charge in the universe, ( E Æ Electric field, ds Æ rea vecotr) Ú E.ds= if cahrge is outside = inside () Ú E.ds = if charge is inside () E.ds could not be defined Ú () Ú E.ds on any surface q Œ if charge is. When electron jumps from n = level to n = level, the angular momentum of electron changes by () h p h p ns: () () () h p h p. Constant DC voltage is required from a variable C voltage. Which of the following is correct order of operation? ns: () Filter, regulator, rectifier () Rectifier, filter, regulator () Rectifier, regulator, filter () Regulator, filter, rectifier. Variation of acceleration due to gravity (g) with distance x from the centre of the earth is best represented by (R Radius of the earth) () () () 5. particle executing SHM has a maximum speed of.5 ms - and maximum acceleration of. ms -. The angular frequency of oscillation is.5" rads! () " rads! ().5rads! () rads!

6 6. source of sound is moving with a velocity of ns: () 5 ms - towards a stationary observer. The observer measures the frequency of sound as 5 Hz. The apparent frequency of sound as heard by the observer when source is moving away from him with the same speed is (Speed of sound at room temperature 5 ms - ) 77.5 Hz () 75 Hz () 666 Hz () Hz 7. n electron of mass m, charge e falls through a distance h meter in a uniform electric field E. Then time of fall () ee t = () t = hm hm t = () t = ee ee hm hm ee 8. capacitor of 8 F is connected as shown. Charge on the plates of the capacitor n n + n + n = () n = n () n = n () n = n 5. Three bodies a ring (R), a solid cylinder (C) and a solid sphere (S) having same mass and same radius roll down the inclined plane without slipping. They start from rest, if V R, V C and V S are velocities of respective bodies on reaching the bottom of the plane, ns: () vr = vc > vs () vr < vc < vs () vr > vc > vs () vr = vc = vs 5. Carnot engine working between K and K has 8 J of useful work. The amount of heat energy supplied to the engine from the source is 6 J () J () J () J 5. The variation of photo-current with collector potential for different frequencies of incident radiation v, v and v is as shown in the graph, 8 C () C () C () C 9. ray of light passes through four transparent media with refractive index n, n, n and n as shown. The surfaces of all media are parallel ns: () # $# # = () # %# %# () # &# &# () # # # If the emergent ray DE is parallel to incident ray B,

7 5. The process of super imposing message signal on high frequency carrier wave is called Modulation () Transmission () Demodulation () mplification 5. Nature of equipotential surface for a point charge is Plane with charge on the surface. () Sphere with charge on the surface of the sphere. () Sphere with charge at the centre of the sphere. () Ellipsoid with charge at foci. 55. n element X decays into element Z by two-step process. X Y + He Y Z+ e X & Z are isotopes. () X & Z are isotones. () X & Y are isotopes. () X & Z are isobars. 56. Light of wavelength 6 ( m is incident normally on a slit of width. mm. The angular width of central maxima in the diffraction pattern is (measured from minimum to minimum)!!.5 ) rad (). ) rad!! () ) rad () 6 ) rad 57. long solenoid with turns per cm carries a current of. The magnetic energy stored per unit volume is J/m. 6." ().6" () " ()." 58. pan filled with hot food cools from 9 C to 86 C in minutes. When the room temperature is C. How long will it cool from 7 C to 66 C?.8 minutes ().5 minutes ().8 minutes () minutes 59. Three projectiles, B and C are projected at an angle of, 5, 6 respectively. If R, R B and R C are ranges of, B and C respectively, (velocity of projection is same for, B & C) R = R C < R B ()R = R C > R B ()R < R B < R C ()R = R B = R C 6. The quantity of a charge that will be transferred by a current flow of over hour minutes period is.8) C () 5. ) C ().8 ) C ().8 ) C