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MHTCET TEST3

Time: 45 Minutes Sub: PHYSICS Max. Marks: 50

1. 1, 2 and 3 are three transparent media. If 13 1.2and 23 0.8, then 21 is equal to a 3/2 b 2/3 c24/25 d 25/242. The dimensions of mutual induction are a ML 2T2A2 b MLT2A2 c M2L1T2A1 dM LT33. Zener diode is used as a voltage regulator in a areverse bias b forward bias c reverse or forwardbias d neither reverse nor forward bias4. The SI unit of self inductance is Ccoulomb a

AC

sN

bAC

joule

sec cC

mvolt dampere

mN/ 5. All condensers in the adjacent circuit are identical andeach is of capacity C. The equivalent capacity betweenpoints B and D is a C b 5C c 2 c d 3 C

6. A ball is suspended from the ceiling of a car with thehelp of a string. If the car turns toward left, then theball will move a towards left b towards right cwill not move d depending upon its mass 7. A singly ionized helium ion revolves in circular orbit ofradius r with orbital velocity V. The magnitude anddirection of the magnetic moment of the orbit is aevr b 1/2 evr c 1/4 evr d 2 evr 8. The extraction of cream from milk when it is churneddepends upon a centrifugal force b centripetalforce c cohesive force d gravitational force9. The plane of a coil is vertical and is inclined at an angleof 30 with the plane of magnetic meridian. n isnumber of turns, A is area of cross section and H ishorizontal component of earth's magnetic field. If thecoil is rotated to a position where its plane is inclinedat 120 with the magnetic meridian, in 0.5 s, inducedemf across the coil is a 13nAH b 13nAHc 31nAH d d 3 1nAH10. For a rigid body the quantity J2/2I is equivalent toJ angular momentum and I moment of inertia aRotational kinetic energy b torque c Linearmomentum d acceleration11. A graph between an output voltage of an induction coiland time t is obtained; Following are the characteristicsof the graph. I the output is alternating II the outputis not sinusoidal III positive and negative peaks arenot equal IV time durations of make and break areequal. Which of the above characteristics is/are NOTtrue? a all the four b II, III and IV c I d IV12. If the radius of a rotating disc is suddenly reduced tohalf its initial value mass remaining constant then itsnew angular velocity will become a four times btwo times c one third d half13. A mill voltmeter has a range of 800 millvolt and aresistance of 80 ohm. A shunt resistance which willconvert it into a milliammeter of range 410 mA is a2 ohm b 20 ohm c 200 ohm d 0.2 ohm14. A wheel of moment of inertia of 10 kgm2 is rotating at10 rotations per minute. The work done in increasing

its speed to 5 times its initial value, will be a 100Joule b 131.4 Joule c 1.314 Joule d 0.131 Joule15. Davisson and Germer's experiment shows that, likewaves electron beam also can a produceinterference b be polarized c be diffracted dproduce photoelectric effect.16. The correct graph between the square of time periodand cube of the distance of the planet from the sun is

a b c d17. When transistor amplifies a voltage a onlyamplitude of the voltage is increased b onlyfrequency of the voltage is increased c amplitude andfrequency both are increased d amplitude isincreased but frequency is decreased.18. At what height from the surface of earth thegravitational force will be reduced by 10% if the radiusof earth is 6370 km. a 750 km b 650km c 450km d 344 km19. Average output voltage in half wave rectifier is agreater than that for a full wave rectifier b smallerthan that for a full wave rectifier c equal to that for afull wave rectifier d incomparable with that for fullwave rectifier.

20. The correct relation between a, and k is a

26

23

+

=

K

K b

23

26

+=

K

K c

26

23

+=

K

K d

26

23

+

+=

K

K 21. Two tangent galvanometers have coils of radii rl andr2 and number of turns nl and n2. They areconnected in series in a circuit carrying current.Deflection in the first TG is . That of second TG is ar1/r2n1/n2 b tan1 r1/r2n2/n1tan c tan1r2/r1n1/n2tan d 22. A steel wire of uniform crosssection of 2mm2 isheated upto 50c and clamped rigidly at two ends. Ifthe temperature of wire falls to 30c tension in the wirewill be coefficient of linear expansion of steel is 1.1 x105 C and Youngs modulus of elasticity of steel is 21011 N/m2..... a 44 newton b 88 newton c 132newton d 22 newton23. In a biprism experiment intensity at a point ofconstructive interference is I. The upper half part of thebiprism is blackened Intensity at the same point willbe a I/4 b I/2 c I d 4I24. The ratio of excess pressures in two soap bubbles is 3:1. The ratio of their volumes will be a 3 : 1 b 1 : 3c 1:27 d 1 : 925. Magnetic properties of a specimen are found to beinversely proportional to absolute temperature. Thespecimen is a ferromagnetic b diamagnetic c

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paramagnetic d either a ferromagnetic or aparamagnetic.26. What will be the value of excess pressure inside a soapbubble of radius 2103 m, if the surface tension of soapsolution is 0.03 N/m? a 20 N/m2 b 60 N/m2 c 30N/m2 d zero27. A glass sphere of radius r placed in air is given a chargeQ at a point. The mechanical force per unit area atanother point diametrically opposite to the first pointis a Q/4r2/2 b Q2/20 c Q/4r2/0 d zero28. Which of the following motions of perfect gasmolecules is responsible for the temperature of perfectgas? a rotatory motion b vibratory motion ctranslatory motion d rolling motion29. A ray of light is incident normally on a right angleprism of angle 30. If RI of prism is 1.52 then angle ofdeviation is a 20. b 30. c 50. d 60.30. The possible values of specific heat of gas are between a and 0 b 0 and c and d 1 and 131. S is a monochromatic source of light of wave length .A convex lens gives out a parallel beam as shown in thefigure. If d is separation between two rays M and N. Thepath difference between them is a db d/ c

/d d zero.32. The rms velocity of ideal gas molecules at a constanttemperature is a directly proportional to thesquare of molecular weight b directly proportional tomolecular weight c inversely proportional tomolecular weight d inversely proportional to squareroot of molecular weight.33. Three condensers of capacities 3 F, 10F and 15 Fare to be combined to give equivalent capacity of 9 F.The proper combination is a all in series b l0Fand 15F in series and 3F in parallel c 15F and3F in series and 10F in parallel d l0 F and 3F inseries and 15F in parallel.34. Temperature of a gas can be changed by changinga only pressure b only volume c both pressureand volume d all the three a, b and c35. P and Q are two particles of ether on a sphericalwavefront of light. Equation of SHM of P is Y1 0.03 sint 1000. The equation of SHM of Q is Y2 a0.03 sint 1001 b 0.04 sint 1001 c 0.03sint 999 d 0.04 sint 100036. The wavelength of radiations emitted by a perfectlyblack body depends on a temperature of body bmass of body c speed of body d distance of bodyfrom sun37. When a photon of energy 3 eV strikes a metal surface,photo electrons with maximum KE of Tmax are ejected.When a photon of 5 eV strikes the same metal surface,maximum KE is doubled. The work function of themetal is a 1 eV b 1.5 eV c 2 eV d 2.5 eV38. The graph between velocity v and displacement x fora harmonic oscillator is a a parabola b circle cellipse d straight line

39. Shortest wavelength in Paschen series is R isRydgerg's constant a 16/R b 25/R c R/9 d 9/R40. The height of liquid column in a U, tube is 0.3 meter. Ifthe liquid in one of the limbs is depressed and then

released, then the time period of liquid column will be a 1.1 sec b 1.9 sec c 0.1 1 sec d 2 sec.41. There is some contact resistance only at left end of ameter bridge wire. When a resistance X is connected inthe left gap and 6 ohm resistance in right gap thebalancing length is 50 cm. When the two resistancesare interchanged the balancing length is 60 cm. Thecontact resistance is a 1.2 ohm b 2.4 ohm c 6ohm d 3 ohm42. The equation of displacement of a harmonic oscillatoris x 15 sin 20t meter. Its amplitude and angularvelocity respectively as a 15 m and 20 rad/sec.b 20 rad/sec and 15m c 15 m and 10 rad/secd 15 m. 20 rad/sec43. An electron passes through a space in which a mag.field B and electric field E are so applied that it passesin undeflected path with constant velocity V throughthe space. If the direction of mag. field is reversed inthis space the electron will pass through the spacealong a the same direction with constant velocityb the same direction with increasing velocity c the

parabolic path with accelerationmBvEe )(

+ perpendicular to direction of E d the parabolic pathwith acceleration

m

BvEe )( antiparallel to directionof E.44. The speed of sound in a perfectly rigid rod is a zerob infinite c 332 m/s d 664 m/s45. In the circuit shown B is a bulb connected with an ACsource. The bulb will a not glow at all as diodes arereversed biased b glow for complete cycle of AC. cglow for only half cycle of AC. d glow for 3/4 th of

cycle.46. The ratio of overtones in a closed pipe withfundamental freq. is a n : 3n : 5n b n : 2n : 3n c3n : 5n : 7n d n : 2n : 4n47. The power factor of a series LR circuit is 3/2. Theresistance R 50 ohm and frequency of AC is 25HzThe inductance L is equal toa 1/3 henry b 3henry c 2/3 henry d 3/2 henry48. In a wave motion the distance between twoconsecutive crests is 5cm and two cycles per secondpass any point in the medium. The wave velocity willbe a 20 cm/s b 10 cm/s c 150 cm/s d 5cm/s49. The resolving power of a telescope having objective ofdiameter of 100 cm and using light of 5000 AU is a106 b 106 c 2 106 d 2 10650. A cold junction of a thermocouple is placed at 00c bycovering it with ice and hot junction is heated. T n and Tiare neutral and inversion temperature. Then a Tn 1/2 Ti b Tn 2Ti c Tn 2Ti d Tn 1/2Ti