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ADHYAPAK CHANNELS
Entrance Examinations
ANDHRA - EAMCET
Other City Education
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| Questions | Answers | |
| 1. | The frequencies of two tuning forks are 480 cps and 480.05 cps respectively. When sounded together, after how much interval the maximum sound will become half if the minimum intensity is zero ? |
5 s 10 s 20 s 0.025 s |
| 2. | A traveling wave passes a point of observation where in the time interval between two successive crests in found to be 0.2 s. Then |
the wave length of the wave is 5 m the frequency of the wave is 5 cps the velocity of the wave is 5 m/s all the above |
| 3. | Ultrasonic waves are those waves |
to which human ear in sensitive are of high velocity are of high amplitude none of these |
| 4. | The Laplace's correction for the expression for the velocity of sound given by Newton was needed because the sound waves |
are Longitudinal propagate adiabatically propagate isothermally have long wave lengths |
| 5. | When two waves having constant phase difference produce interference, then there is |
loss of energy gain in energy redistribution of energy which does not depend on time redistribution of energy which depends on time |
| 6. | The
equation of a wave traveling on a string is given by y = 10 sin  /2 (8t
- x/8); where x and y are in cms. The velocity of the wave is |
32 cms in the negative x-direction 32 cms in the positive x-direction 64 cms in the negative x-direction 64 cms in the positive x-direction |
| 7. | Equation
of a progressive wave is given by y = 0.2 cos (0.04t
+ 0.02x -/6);where the distances are expressed in centimeter and time in second. The minimum distance between two particles having a phase difference of /2
is |
4 cm 8 cm 25 cm 1.25 cm |
| 8. | By the principle of superposition, the resultant displacement in equal to the |
sum of the two displacements produced by two
waves vector sum of the two displacements produced by two waves the difference between the two displacements produced by two waves none of these |
| 9. | The work done by the string of a simple pendulum during one complete oscillation is equal to the |
Total energy of the pendulum KE of the pendulum Pe of the pendulum Zero |
| 10. | Which of the following is a necessary and sufficient condition for simple harmonic motion? |
Proportionality between restoring force and the
displacement from the equilibrium position. Constant period Constant acceleration All of the above |
| 11. | Two charges 4q and q are kept "x" m apart. At what distance must be another charge "e" must be placed from the charge q, so that it is in equilibrium ? |
x/3 x/2 x/4 2x/3 |
| 12. | A meatalic sphere has charge of 10 nC. A unit negative charge is moved from a point A to a point B, both I m away from the centre of the sphere, A being on the east side B being on the west side. The total work done is |
-2/10J -1/10J zero cannot be calculated |
| 13. | The distance between two point charges 25 µC and 36 µC is 0.11m. At what point on the line joining the two charges in the intensity be zero ? |
At a distance of 0.05 m from 36 µC charge At a distance of 0.05 m from 25 µC charge At a distance of 0.11 m from 36 µC charge At a distance of 0.11 m from 25 µC charge |
| 14. | If a glass rod is rubbed with silk, it acquires positive charge. This is because |
protons are added to it electrons are added to it electrons are removed from it either (a) or (c) |
| 15 | The pressure-temperature relationship for an ideal gas undergoing adiabatic change is |
P1- T =constantP/T =constant P T1- =constant PT1- =
constant |
| 16. | The horizontal range of a particle thrown along a direction making an angle of 45degrees with the horizontal is equal to |
the vertical light twice the vertical light four times the vertical light half the vertical light |
| 17. | A body is thrown vertically upwards. If air resistance is not taken into account, then the time of ascent is |
equal to the time of descent greater than the time of descent less than the time of descent twice the time of descent |
| 18. | A stationary observer feels greater pitch of a sound while moving towards the source. The reason for this is |
increase in the pitch of the source decrease in the wave length of the sound waves increse in the velocity of sound increase in the wave length of the sound waves |
| 19. | A blowing whistle is turned rapidly on a horizontal circle. A man standing outside the circle will be |
not hear it listens uniform sound listens one maxima and one minima listens two maxima two one minima |
| 20. | When a light source is approaching an observer |
wavelength of light decreases wavelength of light increases wavelength of light remains unaltered velocity of light increases |
| 21. | An ammeter gives a full scale definition for a current of 1A. To convert it into a 10A range ammeter, the ratio of its resistance and shunt resistance will be |
1 : 9 10 : 1 9 : 1 1 : 10 |
| 22. | Two unequal resistances are connected in parallel. Which of the following statement is correct ? |
The current through both in the same The voltage drop across each is the same The current through the higher resistance is high None of these |
| 23. | A cell of emf E is connected across an external resistance R. If the terminal p.d., across the cell is V volts, the internal resistance of the cell is given by |
(E - V) R / V (E - V) R / E (V - E) R / V (V - E) R / E |
| 24. | There are n similar conductors each of resistance R. When connected in parallel, the equivalent resistance is "x". When connected in series, the equivalent resistance will be |
x/n nx n2x x/n2 |
| 25. | Given three equal resistors, how many different combinations of all the three can be made ? |
4 6 8 3 |
| 26. | An
infinite number of resistors are connected as shown in the figure.
If R1 = 1  and R2 = 2 the equivalent resistance across the terminals AB is |
Infinity 2 1 1.5 |
| 27. | If the length of a potentiometer wire is increased, then the balancing length previously obtained will |
increase decrease remain unchanged becomes two times |
| 28. | A current I flows through an infinitely long straight conductor. If "r" is the perpendicular distance of a point from the wire, then the magnetic induction B varies with "r" as |
B r0 B r -1 B r -2 B r -3 |
| 29. | The field due to a long straight wire carrying a current I is proportional to |
I I 3  1 / I |
| 30. | For a paramagnetic material the dependence of the magnetic susceptibility x on the absolute temperature T is given by |
x T x 1/Tx eTx is constant |
| 31. | Which of the following statement is true in the case of electric lines of force ? |
They are always parallel to one another In a non-uniform electric field, the lines of force interest each other They are always perpendicular to each another They are always terminate at negative charges. |
| 32. | A variable capacitor and an electroscope are connected in parallel to a battery. The reading of the electroscope would be decreased by |
increasing the area of the overlap plates of the
capacitor placing a pile of paraffin wax between the plates of capacitor decreasing the distance between the plates decreasing the battery potential |
| 33. | A parallel plate capacitor has a capacitance of 50 µF with air as dielectric and 110 µF with an oil as a dielectric. The dielectric constant of the oil is |
2.2 1.1 0.5 1 |
| 34. | A parallel plate capacitor has a capacitance of 10 µF with air as dielectric. The area of the capacitor is divided into two equal halves and filled with two media having dielectric constants 2 and 4. The capacitance of the system will now be |
10 µF 30 µF 5 µF 20 µF |
| 35. | The capacity of a spherical conductor of radius R is given by |
R / 4  4 /
R4 R1 / 4 R |
| 36. | . An infinite number of capacitors each of capacitance 1µF are connected to parallel branch contains 2n capacitors connected in series where n=0, 1, 2, 3, 4,.. The equivalent capacitance of the combination is equal to |
1µF 2µF 0.5µF infinity |
| 37. | The value of a resistance with a colour code yellow, violet and gold is |
47± 5 % 4.7 ± 5 %4.7 ± 20 %0.47 ± 5 |
| 38. | A current of 4.8 A is flowing through a conductor. The number of electrons passing per second across a point is |
3 X 10 19 7.68 X 10 20 3 X 10 20 7.68 X 10 19 |
| 39. | The
specific resistance of a material is 0.5 µ -m.
The resistance of a cube of length0.5 m of the material will be |
.05 10 -3 10 -5 10 -6 |
| 40. | Four resistance 10 ,
2,
5 and 25 are connected in cyclic order in the form of a Wheatstone's bridge.
A current of 1.4 A enters at the junction of 10 and 25 resistors. The current through the 2 resistor is |
1 A 1.2 A 1.4 A none of these |
| 41. | For a telescope to have a large resolving power, the |
focal length of its objective should be large focal length of its eye-piece should be large focal length of its objective should be small aperture of its objective should be large |
| 42 | A light wave has a frequency of 4x10 14 Hz and a wavelength of 5x10-7 metres in a medium. The refractive index of the medium is |
1.5 1.33 1.6 2.4 |
| 43. | A person sees his virtual image by holding a mirror very close to his face. When he moves the mirror away from his face, the image becomes inverted. What type of mirror is he using ? |
Plane mirror Convex mirror Concave mirror None of these |
| 44. | In electromagnetic radiations |
magnetic field remains unchanged while electric
field changes with time electric field remains unchanged while electric field changes with time both electric and magnetic fields are time dependant neither electric nor magnetic fields are time dependant |
| 45. | An
inductance of 1 mH, a capacitor of 10µF and a resistance of
50 are
connected in series. The reactances of inductor and capacitor are
same. The reactance of either of them will be |
100 50 30 10 |
| 46. | The power factor in a circuit connected to an ac power supply has a value which is |
unity when the circuit contains an ideal capacitor
only unity when the circuit contains an ideal resistance only unity when the circuit contains an ideal inductance only zero when the circuit contains an ideal resistance only |
| 47. | In a transformer the core is made up of soft iron to reduce |
hysteresis loss eddy current loss magnetic flux linkage all the above |
| 48. | A coil and bulb are connected in series with a de source. When a soft core is inserted into the coil, |
intensity of the bulb decreases intensity of the bulb increases intensity of the bulb remains unchanged the bulb ceases to glow |
| 49. | In a transformer, the coefficient of mutual induction between the primary and secondary coil is 0.2 H. When a current changes by 5 amperes/second, the emf induced in the secondary is |
1V 5V 20 V 15V |
| 50. |
A rod
of length 0.4 m moves in a direction perpendicular to a magnetic field
of strength 1.2 T. The emf induced in the moving rod is 2.4 V. What is the speed of the rod ? |
0.5 m/s 2.5 m/s 7.5 m/s 5 m/s |
| 51. | The objective of a telescope has a focal length of 1.2 m and diameter 0.05 m. The focal length of the eye-piece is 0.05m. The magnifying power of the telescope for distant object is |
10 24 60 100 |
| 52. | The momentum of a photon is 3.3 *10 -29 kg-m/s. Its frequency will be |
3 x10 13 Hz 6 x10 13 Hz 1x 10 13 Hz 1.5 x10 13 Hz |
| 53. | The de Broglie wavelength of a mass 1 kg moving with a speed of 1 m/s is |
6.6 x10 -34 m 6 x10-34 m 6.6x10 -10 m 6x 10 -10 m |
| 54. | Which experiment indicates that the whole positive charge of an atom is concentrated in the nucleus of size10 -14 m ? |
Madam Curie's experiment with
radioactivity Rutherford's experiment on µ-ray scattering Faraday's experiment on electrolysis Thomson's experiment to determine the specific charge of electron |
| 55. | The half life period of radium is 1600 years. Its average life time is |
1600 years 1/1600 years 2319 years 1/2319 years |
| 56. | In
the reaction 92 U 235 + 0 n1-->51 Xe 140 + z SrA + 2 0 n1 + photon the values of Z and A are |
38, 94 39, 94 38, 95 41, 94 |
| 57. | The energy required to knock out the electron in the third orbit of a hydrogen atom is equal to |
13.6 eV + 13.6/9 eV + 13.6/3 eV none of these. |
| 58. | When the electrical conductivity of a semiconductor is due to the breaking up of its covalent bonds only, then the semiconductor ids said to be |
a p-type semiconductor a n-type semiconductor an intrinsic semiconductor a extrinsic semiconductor |
| 59. | Electron,
proton, neutron and -particle
are moving with equal velocity. Which one of them will have the smallest
wave length ? |
Electron Proton Neutron a-particle |
| 60. | Fusion reaction takes place at very high temperatures because |
atoms are ionized at high temperatures KE is high enough to overcome the electrostatic force of repulsion Molecules break up at high temperatures All the above |