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# AFMC Physics 1994

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• ### AFMC Physics 1994

1. 1. AFMC–Past papers<br />PHYSICS- UNSOLVED PAPER - 1994<br />
2. 2. SECTION – A<br />Single Correct Answer Type<br />There are five parts in this question. Four choices are given for each part and one of them is correct. Indicate you choice of the correct answer for each part in your answer-book by writing the letter (a), (b), (c) or (d) whichever is appropriate<br />
3. 3. Problem<br />01<br />Heat is transmitted from a higher temperature to a lower temperature through an actual motion of the molecules in<br />Radiation<br />Conduction<br />Convection <br />All of these<br />
4. 4. Problem<br />02<br />The decay constant of radium is 4.28 x 10-4 per year. Its half-life is approximately<br />620 Years<br />60 years<br />2000 years<br />1250 years<br />
5. 5. Problem<br />03<br />An observer looks at a tree of height 15 metres with a telescope of magnifying power 10. To him, the appears<br />10 times nearer<br />10 times taller<br />15 times nearer<br />15 times taller<br />
6. 6. Problem<br />04<br />The pitch of note depends upon its<br />Amplitude frequency <br />Frequency<br />Speed <br />Wavelength<br />
7. 7. Problem<br />05<br />The number of particles in one mole of a substance is known as<br />Reynolds number<br />Boltzmann constant <br />Avogadro constant<br />Planck’s consent<br />
8. 8. Problem<br />06<br />If the values of force (F) and length (L) increases 3 times, the value of work done (W) will increase <br />9 times<br />3 times <br />27 times<br />6 times<br />
9. 9. Problem<br />07<br />Absolute temperature can be calculated by<br />Mass of the molecules<br />Root mean square velocity of molecules <br />Direction of motion of the molecules <br />Motion of the molecules<br />
10. 10. Problem<br />08<br />Critical angle will be minimum, when a ray passes from<br />Glass to water <br />Air to glass<br />Water to glass<br />Glass to air<br />
11. 11. Problem<br />09<br />Bubbles are formed in a viscous liquid due to<br />Vapour pressure <br />Surface tension<br />Elasticity <br />Viscocity<br />
12. 12. Problem<br />10<br />If earth stands still. Then weight of a man will<br />Remain the same<br />Increase <br />Become zero <br />Decrease<br />
13. 13. Problem<br />11<br />The frequency of ultrasonic waves is<br />Equal to audible range <br />Above audible range <br />Below audible range<br />Either (a) or (c)<br />
14. 14. Problem<br />12<br />Hydrogen ballon will carry which of the following body most easily,<br />10 kg feather<br />10 kg cotton<br />10 kg iron<br />All of these<br />
15. 15. Problem<br />13<br />The flow of heat from a hot end to a cold end of a rod is<br />Directly proportional to the length of the rod<br />Directly proportional to difference of temperatures<br />Inversely proportional to the radius of the rod<br />Inversely proportional to the difference of temperatures<br />
16. 16. Problem<br />14<br />If focal length of one lens is -40 cm and of other +20 cm, what will be the focal length of the combination?<br />35 cm<br />80 cm<br />30 cm<br />40 cm<br />
17. 17. Problem<br />15<br />A cylinder of 5 litres capacity, filled with air at N.T.P is connected with another evacuated cylinder of 30 litres of capacity. The resultant air pressure in both the cylinders will be <br />21.8 cm of Hg<br />10.8 cm of Hg<br />38.8 cm of Hg<br />14.9 cm of Hg<br />
18. 18. Problem<br />16<br />If a torch is used in place of monochromatic light in Young’s experiment, what will happen?<br />No fringe will appear<br />Fringe will occur as from monochromatic source <br />Only bright fringe will appear<br />Fringe will appear for a moment and then it will disappear.<br />
19. 19. Problem<br />17<br />The focal length of convex lens depends upon<br />Amplitude of the light rays <br />Frequency of the light rays <br />Intensity of the light rays <br />Wavelength of the light rays<br />
20. 20. Problem<br />18<br />Which of the following shows negative coefficient of temperature?<br />Iron <br />Carbon <br />Manganese<br />Silver<br />
21. 21. Problem<br />19<br />Capacity of the parallel plate capacitor can be increased by<br />Increasing the thickness of the plate<br />Increasing the distance between the plates<br />Decreasing the thickness of the plate<br />Decreasing the distance between the plates<br />
22. 22. Problem<br />20<br />If the reference angle of a prism is 600 and minimum deciation 300, what is its angle of incidence?<br />450<br />300<br />900<br />600<br />
23. 23. Problem<br />21<br />If an open organ pipe is sounded with a tuning fork having frequency 256 Hz, the resonance occurred at 35 cm and 105 cm, then the velocity of sound is<br />524 m/s<br />360 m/s<br />720 m/s<br />512 m/s<br />
24. 24. Problem<br />22<br />In an ideal gas, the energy is<br />Totally potential <br />Totally kinetic<br />Difference of (a) and (b)<br />Sum of (a) and (b).<br />
25. 25. Problem<br />23<br />If the density of oxygen is 16 times that of hydrogen, what will be the ratio of velocity of sound in oxygen and hydrogen?<br />2:1<br />1:4<br />1:16<br />4:1<br />
26. 26. Problem<br />24<br />The expansion during heating <br />Increases the weight of material <br />Occurs only in a solids<br />Decreases the density of material <br />Occurs at the same rate for all liquids and solids<br />
27. 27. Problem<br />25<br />Under elastic limit, stress is<br />Independent of strain<br />Directly proportional to strain<br />Indirectly proportional to strain<br />All of these<br />
28. 28. Problem<br />26<br />A current loop, placed in magnetic field, behaves like a<br />Magnetic pole<br />Magnetic dipole<br />Magnetic substance<br />All of these<br />
29. 29. Problem<br />27<br />Boyle’s law is applicable in<br />Isobaric process<br />Isochoric process<br />Isotonic process<br />Isothermal process<br />
30. 30. Problem<br />28<br />A block of steel heated up to 10000c is left in a room to coll. Which of the curves shown in figure represents the correct behavior?<br />A<br />B<br />C<br />All of these<br />
31. 31. Problem<br />29<br />Radio telescope is used to see<br />Stars and to measure diameters<br />Distant stars and planets<br />High frequency waves<br />Sun and to measure its temperature<br />
32. 32. Problem<br />30<br />According to kinetic theory of gases, the temperature depends upon<br />Root mean square velocity<br />Motion of the molecules<br />Attraction of the molecules<br />Collision of the molecules<br />
33. 33. Problem<br />31<br />If tube length of astronomical telescope is 105 cm and magnifying power is 20 for normal setting , what is the focal length of objective<br />20 cm<br />100 cm<br />10 cm<br />25 cm<br />
34. 34. Problem<br />32<br />Magnetic permeability is maximum for<br />Ferromagnetic substance <br />Diamagnetic substance <br />Paramagnetic substance<br />All of these<br />
35. 35. Problem<br />33<br />Amplitude depends upon<br />Pitch <br />Frequency<br />Wavelength <br />None of these<br />
36. 36. Problem<br />34<br />Which of the following is different from others?<br />Frequency<br />Wavelength<br />Amplitude<br />Velocity<br />
37. 37. Problem<br />35<br />A body is in equilibrium under the action of three coplanar forces P, Q and R as shown in the figure. Select the correct statement<br />a.<br />b.<br />c.<br />d.<br /> <br />
38. 38. Problem<br />36<br />A body goes 10 km north and 20 km east. What will be displacement of the body from its initial point?<br />15.16 km <br />22.36 km<br />12.21 km<br />20.21 km<br />
39. 39. Problem<br />37<br />The phenomenon of electrolysis was first given by<br />Faraday<br />Arrhenius<br />Joule<br />Kirchhoff<br />
40. 40. Problem<br />38<br />The refractive index of water and glass with respect to air is 1.3 and 1.5 respectively. What will be the refractive index of glass with respect to water?<br />a. 1.5/2.6<br />b. 1.5/1.3<br />c. 2.6/1.5<br />d. 1.3/1.5<br />
41. 41. Problem<br />39<br />The reciprocal of specific resistance is<br />Conductive reactance <br />Plate resistance<br />Conductive resistance<br />Specific conductance<br />
42. 42. Problem<br />40<br />How many images will be formed if two mirrors are fitted on adjacent wall and one mirror on ceiling?<br />7<br />2<br />11<br />5<br />
43. 43. Problem<br />41<br />Ina compound microscope for large magnification size, the length of the eye piece should be<br />Less than objective <br />Equal to objective<br />Of any value <br />Greater than objective<br />
44. 44. Problem<br />42<br />A body is dropped from the top of a tower with zero velocity and reaches ground in 4 seconds. The height of the tower is about ( g=10 m/s2)<br />80 m<br />20 m<br />160 m<br />40 m<br />
45. 45. Problem<br />43<br />The amplification of triode is controlled by<br />Anode <br />Grid<br />Cathode<br />All of these<br />
46. 46. Problem<br />44<br />The gas present around radioactive material is<br />Ne<br />H<br />Cl2<br />He<br />
47. 47. Problem<br />45<br />The magnetic effect of current was first of all given by<br />Kirchhoff<br />Joule<br />Michael Faraday<br />Forested<br />
48. 48. Problem<br />46<br />The frictional force is<br />Vector quantity<br />Self – adjustable<br />Scalar quantity<br />Not self – adjustable<br />
49. 49. Problem<br />47<br />Self – induction of a coil is numerically equal to the total magnetic flux linked with it, when a unit<br />Charge passes through it <br />Current passes through it <br />Magnetic field passes through it <br />Voltage passes through it<br />
50. 50. Problem<br />48<br />Which of the following is an example of scalar quantity?<br />Angular momentum<br />Velocity<br />Electrostatic potential<br />Force<br />
51. 51. Problem<br />49<br />In insulators electricity does not pass because<br />Molecules are not mobile<br />Electrons are not mobile in insulators <br />Electrons are very compact in insulators<br />It shows pressure difference like solids.<br />
52. 52. Problem<br />50<br />Which of the following pairs has same dimensions?<br />Stress and strain<br />Pressure and density<br />Momentum and inertia<br />Impulse and momentum<br />
53. 53. For solution visit www.vasista.net<br />