# (d) None 11. The unit for moment of inertia is (a) kg m 2 (b) kg m (c) kg m 2 (d) kg m The unit for pressure is

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1 1. A man is standing between two parallel cliffs and fires a gun. If he hears first and second echos after 1.5s and 3.5s respectively, the distance between the cliffs is (velocity of sound in air = 340ms 1 ) (a) 1190m (b) 850m (c) 595m (d) 510m 2. The fundamental frequency of a closed pipe is 220Hz. If three-fourth of the pipe is filled with water, the frequency of the first overtone of the pipe now is (a) 220Hz (b) 440Hz (c) 880Hz (d) 1760Hz 3. The temperature of the top of a frozen lake is 15 C. What is the temperature of the water in the lake in contact with the ice layer? (a) 0 C (b) 4 C (c) 15 C (d) 7.5 C 4. The terminal colours of the rainbow are (a) violet and red (b) violet and green (c) red and green (d) red and blue 5. The three primary colours are (a) violet, green and red (b) indigo, blue and orange (c) blue, green and red (d) blue, yellow and red 6. The velocity of sound at same temperature is maximum in (a) H 2 (b) N 2 (c) O 2 (d) NH 3 7. The unit for energy is (a) watt (b) joule (c) joule per second (d) Newton 8. If a spring of spring constant k is halved then the new constant is (a) 2k (b) k/2 (c) 4k (d) k/4 9. Beats are produced at the regions of (a) constructive interference (b) destructive interference (c) both constructive and destructive interference (d) none of the above 10. The intense factor of a 40dB sound compared to a 80dB sound is (a) 10 (b) 10 4 (c) 10 3 (d) None 11. The unit for moment of inertia is (a) kg m 2 (b) kg m (c) kg m 2 (d) kg m The unit for pressure is

2 (a) watt (c) pascal (b) newton (d) ampere 13. A tube closed at one end and containing air produces, when excited the fundamental note of frequency, 512Hz. If the tube is open at both ends the fundamental frequency that can be excited (in Hz) is (a) 1024 (b) 812 (c) 256 (d) The fundamental frequency of a string stretched with a weight of 4kg is 256Hz. The weight required to produce its octave is (a) 4kgwt (b) 8kgwt (c) 12kgwt (d) 16kgwt 15. The unit of pressure is (a) watt (b) Newton (c) pascal (d) ampere 16. A simple pendulum suspended from the ceiling of a train has a period T when the train is at rest. When the train is accelerating with a uniform acceleration the time period of simple pendulum will (a) decrease (b) increase (c) remain unchanged (d) become infinite 17. A wave is represented by the equation y = 7 sin[π(2x 2t)] where x is in metres and t in seconds.the speed of the wave is (a) 7ms 1 (b) 2ms 1 (c) 1ms 1 (d) 4ms A mass suspended from a spring executes simple harmonic motion. When the body is at half the amplitude far from the mean position, the ratio of the kinetic energy and the potential energy of the body will be (a) 1 : 3 (b) 3 : 1 (c) 1 : 4 (d) 1 : The waves moving from a sitar to a listener in air are (a) longitudinal and progressive (b) longitudinal and stationary (c) transverse and progressive (d) transverse and stationary 20. Which one of the following equations represents a wave? (a) y = a(wt kx) (b) y = asinwt (c) y = acoskx (d) y = asin(at bx + c) 21. Sound travelling at 340ms 1 enters water where the speed of sound becomes 1480ms 1. Critical angle for total reflection is (a) 10.3 (b) 13.3 (c) 86.7 (d) 89.7

3 22. Ultrasonic signals sent from SONAR returns to it after reflection from a rock after a lapse of 1s. If the velocity of ultrasound in water is 1600ms 1, the depth of the rock in water is (a) 300m (b) 400m (c) 500m (d) 800m 23. In Doppler effect, if the source moves towards the observer, the spectral line is shifted towards the (a) blue end of the spectrum (b) red end of the spectrum (c) either end of the spectrum (d) none of these 24. The value of the universal gravitational constant, G is (a) Nm 2 /kg 2 (b) Nm 2 /kg 2 (c) Nm 2 /kg 2 (d) Nm 2 /kg A particle of mass 40g executes a simple harmonic motion of amplitude 2.0cm. If the time period is 0.20s, the total mechanical energy of the system is (a) J (b) J (c) 7.9J (d) 79J 26. A bottle weighing 200g and of area of cross-section 50cm 2, and height 4cm oscillates on the surface of water in vertical position. Its frequency of oscillation is (a) 1.5s 1 (b) 2.5s 1 (c) 3.5s 1 (d) 4.5s A transverse wave passes through a string with the equation y = 10 sinπ(0.02x 2.00t), where x is in metres and t in seconds. The maximum velocity of the particles in wave motion is (a) 63ms 1 (b) 100ms 1 (c) 78ms 1 (d) 121ms The velocity of neutron in nuclear reactor is retarded by (a) Ordinary water (b) Heavy water (c) Mercury (d) Alcohol 29. The mode of vibrations produced in a pipe, closed at one end, is (a) odd harmonics only (b) even harmonics only (c) both odd and even harmonics (d) alternate odd harmonics only 30. The velocity of sound in gas is dependent of (a) pressure (b) temperature (c) density (d) humidity 31. Sound waves in air is always (a) longitudinal (b) transverse (c) stationary (d) electromagnetic

4 32. A stationary sound wave has frequency 165Hz (speed of sound in air = 330ms 1 ) then distance between two consecutive nodes is (a) 2m (b) 1m (c) 0.5m (d) 4m 33. A tube of length 1.05m is closed at one end. If the velocity of sound in air is 336ms 1, then the fundamental and the next higher overtone is (a) 80, 160 (b) 80, 240 (c) 160, 320 (d) 160, A spring is compressed by 10cm when a mass of 1kg hanged from it. Now, with the same mass if the spring is pulled and then released, its time period is [g = 10ms 2 ] (a) π/5 (b) 2π/5 (c) π/10 (d) π 35. The velocity of sound is. the density of the medium (a) directly proportional to (b) inversely proportional to (c) directly proportional to the square root of (d) inversely proportional to the square root of 36. In which radioactive disintegration, neutron dissociates intoproton and electron? (a) He ++ emission (b) β emission (c) γ emission (d) positron emission 37. The splitting of line into groups under the effect of electric or magnetic field is called (a) Zeeman s effect (b) Bohr s effect (c) Heisenberg s effect (d) magnetic effect 38. When Ge crystals are doped with phosphorus atom, then it becomes (a) an insulator (b) π type (c) v type (d) a superconductor 39. Which one of the following statements regarding shooting stars is incorrect? (a) they are meteors (b) they are the debris which got separated from a comet (c) They emit light due to extremely high temperature caused by friction while they are passing through earth s atmosphere (d) they are a kind of a star 40. A particle A has charge + q and a particle B has charge + 4q with each of them having the same mass m. When allowed to fall from rest through the same electric potential difference, the ratio of their speeds v A /v B will become (a) 2 : 1 (b) 1 : 2 (c) 1 : 4 (d) 4 : Black hole is a

5 (a) hole in the ozone layer of atmophere (b) hole in the earth s centre (c) highly dense matter available in the atmosphere (d) hole in troposphere 42. A radioactive substance has a half-life of 60 minutes. During 3 hours the percentage of the material that have decayed would be (a) 12.5% (b) 87.5% (c) 8.5% (d) 25.1% 43. A radioactive reaction is 92 U Pb 206. How many α and β particles are emitted? (a) 10α, 6β (b) 4 proton, 8 neutron (c) 6 electron, 8 proton (d) 6β, 8αα 44. In a common-base amplifier circuit, calculate the change in base current if that in the emitter current is 2 ma and α = (a) 0.04 ma (b) 1.96 ma (c) 9.8 ma (d) 2 ma 45. The element used for radioactive carbon dating for more than 5600 years is (a) C-14 (b) U-234 (c) U-238 (d) Po When a beam of accelerated electrons hits a target, a continuous X-ray spectrum is emitted from the target. Which one of the following wavelengths is absent in the X-ray spectrum if the X-ray tube is operating at 40,000 volts? (a) 1.5 Å (b) 0.5 Å (c) 0.25 Å (d) 1.0 Å 47. In a full-wave rectifier with input frequency 50 Hz the ripple in the output is mainly of the frequency (in Hz) (a) 25 (b) 50 (c) 100 (d) None 48. An image of the sun is formed by a lens of focal length of 30 cm on the metal surface of a photoelectric cell and a photoelectric current (I) is produced. The lens forming the image is then replaced by another of the same diameter but of focal length 15 cm. The photoelectric current in this case is (a) I/2 (b) I (c) 2I (d) 4I 49. In the Bohr s model of the hydrogen atom the lowest orbit corresponds to (a) infinite energy (b) the maximum energy (c) the minimum energy (d) zero energy 50. After two hours, one-sixteenth of the starting amount of a certain radioactive isotope remained undecayed. The half-life of the isotope is (a) 15 min. (b) 30 min.

6 (c) 45 min. (d) 1 hour 51. If we consider electrons and photons of the same wavelength, then they will have the same (a) velocity (b) angular momentum (c) energy (d) momentum 52. The velocity of sound is maximum in (a) a gas (b) a liquid (c) a solid (d) none of the above 53. In good conductors of electricity the type of bonding that exists is (a) ionic (b) vander waals (c) covalent (d) metallic 54. When a hydrogen atom is raised from the ground state to an excited state (a) PE increases and KE decreases (b) PE decreases and KE increases (c) both KE and PE increases (d) both KE and PE decreases. 55. The distance between the body centered atom and a corner atom in sodium (a = Å) is (a) 3.66 Å (b) 3.17 Å (c) 2.99 Å (d) 2.54 Å. 56. The wavelength of the most strongly emitted radiation in the continuous spectrum of a back is (a) directly proportional to its absolute temperature (b) not dependent on its temperature (c) inversely proportional to its absolute temperature (d) directly proportional to its temperature in Celcius scale 57. The wavelength used in radar is (a) 10 metre (b) less than 5 cm (c) 100 metre (d) 1000 km 58. A nucleus ruptures into two nuclear parts which have their velocity ratio equal to 2 : 1. What will be the ratio of their nuclear size (nuclear radius)? (a) 2 1/3 : 1 (b) 1 : 2 1/3 (c) 3 1/2 : 1 (d) 1 : 3 1/2 59. A truth table is given below. Which of the following gates have this type of truth table? A B Y

7 1 1 0 (a) XOR gate (b) NOR gate (c) AND gate (d) OR gate 60. The zero of Kelvin scale is (a) O C (b) 100 C (c) 273 C (d) 200 C Answer Keys 1. (b) 2. (c) 3. (a) 4. (a) 5. (c) 6. (a) 7. (b) 8. (a) 9. (c) 10. (b) 11. (c) 12. (c) 13. (a) 14. (d) 15. (c) 16. (a) 17. (c) 18. (b) 19. (a) 20. (d) 21. (a) 22. (d) 23. (a) 24. (d) 25. (b) 26. (b) 27. (a) 28. (b) 29. (a) 30. (a) 31. (a) 32. (b) 33. (b) 34. (a) 35. (d) 36. (b) 37. (a) 38. (c) 39. (d) 40. (b) 41. (c) 42. (b) 43. (d) 44. (a) 45. (a) 46. (c) 47. (c) 48. (d) 49. (c) 50. (b) 51. (d) 52. (c) 53. (d) 54. (a) 55. (a) 56. (c) 57. (b) 58. (b) 59. (b) 60. (c)

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