# KCET PHYSICS 2014 Version Code: C-2

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1 KCET PHYSICS 04 Version Code: C-. A solenoid has length 0.4 cm, radius cm and 400 turns of wire. If a current of 5 A is passed through this solenoid, what is the magnetic field inside the solenoid? () T () T (3).8 0 T (4) T Wrong question. A gyromagnetic ratio of the electron revolving in a circular orbit of hydrogen atom is C kg. What is the mass of the electron? Given charge of the electron =. 0 9 C (). 0 9 kg () kg (3) 0 kg (4) kg 3. What is the value of shunt resistance required to convert a galvanometer of resistance 00 into an ammeter of range A? Given : Full scale deflection of the galvanometer is 5 ma () 0.5 () (3) 0.05 (4) A circular coil of radius 0 cm and 00 turns carries a current A. What is the magnetic moment of the coil? () 3.4 A m () A m (3) 3 A m (4) 0 4 A m 5. A susceptibility of a certain magnetic material is 400.What is the class of the magnetic material? () Ferromagnetic () Diamagnetic (3) Ferroelectric (4) Paramagnetic. A solenoid of inductance H carries a current of A. What is the magnetic energy stored in a solenod? () 4 J () J (3) 5 J (4) J 7. A multimeter reads a voltage of a certain A.C. source as 00 V. What is the peak value of voltage of A.C. source? () 4.4 V () 00 V (3) 400 V (4) 00 V 8. A series LCR circuit contains inductance 5 mh, capacitance F and resistance 0. If a frequency A.C. source is varied, what is the frequency at which maximum power is dissipated? () 0 Hz () Hz 3 0 (3) 0 Hz (4) Hz 9. A step down transformer has 50 turns on secondary and 000 turns on primary winding. If a transformer is connected to 0 V A A.C. source, what is output current of the transformer? () 00 A () A 0 (3) A (4) 0 A KCET04-Physics 73

2 0. The average power dissipated in A.C. circuit is watt. If a current flowing through a circuit is A and impedance is, what is the power factor of the AC circuit? () 0 () 0.5 (3) Ans (). A plane electromagnetic wave of frequency 0 MHz travels through a space along x direction. If the electric field vector at a certain point in space is V m, what is the magnetic field vector at that point? () T () 0 8 T (3) 8 T (4) 0 T Ans (). Two capacitors of 0 PF and 0 PF are connected to 00 V and 00 V sources respectively. If they are (4) connected by the wire, what is the common potential of the capacitors? () 300 volt () 33.3 volt (3) 400 volt (4) 50 volt Ans () 3 x y 3. A physical quantity Q is found to depend On observables x, y and z, obeying relation Q. The z percentage error in the measurements of x, y and z are %, % and 4% respectively. What is percentage error in the quantity Q? () % () 4% (3) % (4) 3% 4. Which of the following is not a vector quantity? () Momentum () Weight (3) Potential energy (4) Nuclear spin 5. A car moves from A to B with a speed of 30 kmph and from B to A with a speed of 0 kmph. What is the average speed of the car? () 50 kmph () 5 kmph (3) l0 kmph (4) 4 kmph. A body starts from rest and moves with constant acceleration for t s. It travels a distance x in first half of time and x in next half of time, then () x = 3x () x = x (3) x = 4x (4) x = x 7. A person is driving a vehicle at uniform speed of 5 ms on a level curved track of radius 5 m. The coefficient of static friction between tyres and road is 0.. Will the person slip while taking the turn with the same speed? Take g = 0 ms. Choose the correct statement. () A person will slip if < 5 ms () A person will slip if = 5 ms (3) A person will not slip if > 0 ms (4) A person will slip if > 5 ms 8. A stone is thrown vertically at a speed of 30 ms making an angle of 45 with the horizontal. What is the maximum height reached by the stone? Take g = 0 ms. () 5 m () 30 m (3) l0 m (4).5 m KCET04-Physics 74

3 9. A force F 5i ˆ j ˆ 5kˆ acts on a particle whose position vector is r iˆ j ˆ kˆ. What is the torque about the origin? () 8iˆ 0j ˆ 8kˆ () 8iˆ 0ˆj kˆ (3) 0i ˆ 0ˆj kˆ (4) 8iˆ 0ˆj kˆ Ans () 0. What is a period of revolution of earth satellite? Ignore the height of satellite above the surface of earth. Given: () The value of gravitational acceleration g = 0 ms () Radius of earth R E = 400 km. Take = 3.4. () minutes () 85 minutes (3) 90 minutes (4) 5 minutes. A period of geostationary satellite is () 30h () 4h (3) 48h (4) h Ans (). What is the source temperature of the Carnot engine required to get 70% efficiency? Given sink temperature = 7 C () 70 C () 000 C (3) 77 C (4) 90 C 3. A 0 kg metal block is attached to a spring of spring constant 000 Nm. A block is displaced from equilibrium position by 0 cm and released. The maximum acceleration of the block is () 00 ms () 0 ms (3) 0. ms (4) 00 ms Ans () 4. A metallic wire of m length has a mass of kg. If a tension of 00 N is applied to a wire, what is the speed of transverse wave? () 00 ms () 00 ms (3) 0. ms (4) 0 ms Ans () 5. A train is approaching towards a platform with a speed of 0 ms while blowing a whistle of frequency 340 Hz. What is the frequency of whistle heard by a stationary observer on the platform? Given speed of sound = 340 ms () 340 Hz () 330 Hz (3) 30 Hz (4) 350 Hz. A rotating wheel changes angular speed from 800 rpm to 3000 rpm in 0 s. What is the angular acceleration assuming to be uniform? () rad s () 0 rad s (3) 40 rad s (4) 90 rad s 7. A flow of liquid is streamline if the Reynold number is () between 000 to 3000 () less than 000 (3) between 4000 to 5000 (4) greater than 000 Ans () 8. A pipe of 30 cm long and open at both the ends produces harmonics. Which harmonic mode of pipe resonates a. khz source? Given speed of sound in air = 330 ms () Third harmonic () Fifth harmonic (3) Second harmonic (4) Fourth harmonic KCET04-Physics 75

4 9. In anomalous expansion of water, at what temperature, the density of water is maximum? () > 4 C () 4 C (3) 0 C (4) <4 C Ans () 30. An aeroplane executes a horizontal loop at a speed of 70 kmph with its wings banked at 45. What is the radius of the loop? Take g = 0 ms. () 7. km () 4 km (3) km (4) 4.5 km Ans () 3. A body having a moment of inertia about its axis of rotation equal to 3 kg-m is rotating with angular velocity of 3 rad s. Kinetic energy of this rotating body is same as that of a body of mass 7 kg moving with velocity v. The value of V is () ms () ms (3).5 ms (4) 0.5 ms Ans () 3. A cycle tyre bursts suddenly. What is the type of this process? () Isochoric (3) Isobaric () Isothermal (4) Adiabatic 33. An object is placed at 0 cm in front of a concave mirror produces three times magnified real image. What is focal length of the concave mirror? () 0 cm () 5cm (3) 7.5 cm (4). cm Ans () 34. A focal length of a lens is 0 cm. What is power of a lens in dioptre? () 5 D () 0. D (3) 0 D (4) 0 D 35. A microscope is having objective of focal length cm and eyepiece of focal length cm. If tube length is 30 cm and image is formed at the least distance of distinct vision, what is the magnification produced by the microscope? Take D =5 cm. () 5 () (3) 5 (4) A fringe width of a certain interference pattern is = 0.00 cm. What is the distance of 5 th dark fringe from centre? (). 0 cm () 0 cm (3) cm (4) l 0 cm None of the option correct 37. Diameter of the objective of a telescope is 00 cm. What is the resolving power of a telescope? Take wavelength of light = 5000 Å. () 0 ().5 0 (3) (4) A polarized light of intensity I O is passed through another polarizer whose pass axis makes an angle of 0 with the pass axis of the former. What is the intensity of emergent polarized light from second polarizer? () I = I O /5 () I = I O (3) I O /4 (4) I = I O / KCET04-Physics 7

5 39. What is the de Broglie wavelength of the electron accelerated through a potential difference of 00 Volt? () 0.7 Å ().7 Å (3) Å (4).7 Å 40. The maximum kinetic energy of the photoelectrons depends only on () incident angle () potential (3) pressure (4) frequency 4. Which of the following spectral series of hydrogen atom is lying in visible range of electromagnetic wave? () Lyman series () Paschen series (3) Balmer series (4) Pfund series 4. What is the energy of the electron revolving in third orbit expressed in ev? () 4.53 ev ().5 ev (3) 4eV (4) 3.4eV Ans () 43. The relation between half life (T) and decay constant () is () T = log e () T = (3) = log T (4) T 44. A force between two protons is same as the force between proton and neutron. The nature of the force is () Electrical force () Weak nuclear force (3) Gravitational force (4) Strong nuclear force 45. In n type semiconductor, electrons are majority charge carriers but it does not show any negative charge. The reason is () mobility of electrons is extremely small () electrons are stationary (3) atom is electrically neutral (4) electrons neutralize with holes 4. For the given digital circuit, write the truth table and identify the logic gate it represents: A B Y () NAND-Gate () OR-Gate (3) AND-Gate (4) NOR-Gate 47. If -current gain of a transistor is What is the value of -current gain of the transistor? () 4.9 () 0.49 (3) 5 (4) 49 KCET04-Physics 77

6 48. A tuned amplifier circuit is used to generate a carrier frequency of MHz for the amplitude modulation. The value of is LC is () () (3) (4) If a charge on the body is nc, then how many electrons are present on the body? () (). 0 9 (3) (4) Two equal and opposite charges of masses m and m are accelerated in an uniform electric field through m the same distance. What is the ratio of their accelerations if their ratio of masses is 0.5? m a () a () a 0.5 a (3) a 3 a (4) a a 5. What is the nature of Gaussian surface involved in Gauss law of electrostatic? () Magnetic () Scalar (3) Vector (4) Electrical 5. What is the electric potential at a distance of 9 cm from 3 nc? () 300V () 70V (3) 30V (4) 3V 53. A voltmeter reads 4 V when connected to a parallel plate capacitor with air as a dielectric. When a dielectric slab is introduced between plates for the same configuration, voltmeter reads V. What is the dielectric constant of the material? () 8 () 0.5 (3) 0 (4) 54. A spherical conductor of radius cm is uniformly charged with 3 nc. What is the electric field at a distance of 3 cm from the centre of the sphere? () 3 l0 4 Vm () 3 0 Vm (3) Vm (4) 3 V m 55. A carbon film resistor has colour code Green Black Violet Gold. The value of the resistor is () 500 ± 5% M () 50 M (3) 500 ± 0% M (4) 500 M 5. Two resistors of resistances and are connected in parallel. This combination is then connected to a battery of emf V and internal resistance 0.5. What is the current flowing through the battery? 4 () A () 4 A (3) l A (4) 4 A The equivalent resistance of two resistors connected in series is and their parallel equivalent resistance is 4 A. What are the values of resistances? 7 () 4, () 4, (3), (4) 8, KCET04-Physics 78

7 58. In a potentiometer experiment of a cell of emf.5 V gives balancing length of 30 cm. If the cell is replaced by another cell, balancing length is found to be 40 cm. What is the emf of second cell? () 47V ().57V (3).37V (4).7V 59. A charged particle experiences magnetic force in the presence of magnetic field. Which of the following statement is correct? () The particle is stationary and magnetic field is perpendicular. () The particle is moving and magnetic field is perpendicular to the velocity. (3) The particle is stationary and magnetic field is parallel. (4) The particle is moving and magnetic field is parallel to velocity. Ans () 0. If a velocity has both perpendicular and parallel components while moving through a magnetic field, what is the path followed by a charged particle? () Linear () Circular (3) Helical (4) Elliptical * * * KCET04-Physics 79

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