Staff Selection Commission (SSC) General Science (Physics) Question Paper 2015
Sunday, July 26, 2015
General Science (Physics) Practice Questions for all Exams
1. Which mirror is to be used to obtain a parallel beam of light from a small lamp ? – Concave mirror
2. The focal length of the lens in a photographic camera is 5 cm. What is the power of the lens? – + 20 D
3. When viewed in white light, why do soap bubbles show colours? – Because of interference
4. Angular separation between two colours of the spectrum depends upon which thing? – Angle of deviation
5. Total internal reflection of light is possible when light enters from which thing? – Water to air
6. Which is used to remove astigmatism for a human eye? – Cylindrical lens
7. Why does diffusion of light in the atmosphere take place? – Due to dust particles
8. Which phenomena can not be attributed to the refraction of light? – Redshift
9. Total internal reflection can take place when light travels from which thing? – Diamond to glass
10. The refractive index of a given piece of transparent quartz is greatest for which light? – Violet light
36. Why is In a hydel station the motion produced in turbines? – Due to the flow of water
37. What is most suitable for the core of an electromagnet? – Soft iron
38. At a grid sub stations the voltage is stepped up to reduce loss of which thing? – Power
39. Equal charges are given to two spheres of different radii. What will the potential be? – More on smaller
sphere
40. Two electron beams are travelling parallel to each other. What will be their reactions? – Repel each other
41. Instrument used to store the electric charge is known by which name? – Capacitor
42. When an ebonite rod is rubbed with fur, which charge acquired by the fur? – Positive
43. Conversion of chemical energy into electrical energy occurs in which thing? – Battery
44. What is the temperature at which a ferromagnetic material becomes paramagnetic? – Curie temperature
45. A magnetic needle is kept in non uniform magnetic field. What does itexperiences? – A force and a torque
46. Where will be the Time period in a vibration magnetometer infinite? – At magnetic pole
47. The north pole of the earth’s magnet is near the geographical which direction? – South
48. If the current in the core decreases, what will the strength of the magnetic field be? – Decreases
49. The intensity of a magnetic field is defined as the force experienced by which pole? – Unit north pole
50. If a material, placed in a magnetic field is thrown out of it, then how is the material? – Diamagnetic
51. The capacity of a pure capacitor is 1 farad. In D.C. circuit, what will its effective resistance be? –
Infinite
52. If a bar magnet is cut length wise into 3 parts, what will the total number of poles be? – 6
53. For electroplating a spoon, it is placed in the voltameter at which postion? – The position of cathode
54. A substance, when inserted between the poles of a magnet, is pushed out, what is it? – Diamagnetic
55. By inserting a soft iron piece into solenoid, what does the strength of the magnetic field? – Increase
56. The magnetic induction associated with currents flowing in a hollow copper tube, how will be? – only out
side
57. How is the electric potential at the centre of a charged conductor? – Same as on the surface
58. What is not the cause of low conductivity of electrolyte? – Ionisation of salt
59. What is Electric field intensity at a point a hollow charged spherical conductor? – Is zero
60. Which property is processed by the ferromagnetic substance? – Hysterasis
61. Which type of cell can be used if a device requires 75 A of current for 15 seconds? – Lead-acid cell
62. A hydrogen atom is paramagnetic. What is a hydrogen molecule? – Diamagnetic
63. In nuclear fission, how many percentage of mass is converted into energy? – 0.1%
64. X210 has half life of 5 day. What is the time taken for seven-eights of sample of X210 to decay? – 15 days
65. If a U-238 nucleus splits into two identical parts, how will the two nuclei be so produced? – Stable
66. What is the half-life of a radioactive element which has only 1/32 of its original mass left after a lapse
of 60 days? – 12 days
67. If a proton of mass m is moving with the velocity of light, what will its mass be? – Infinite
68. What was the fissionable material used in the bomb dropped at Nagasaki (Japan) in the year 1945? –
Plutonium
69. Energy transferred to a person through gamma rays is measured in by which unit? – Roentgens
70. Which field is used to produce deflection in a television picture tube? – A magnetic fields
71. The electron emitted in beta radiation originates from where? – Inner orbits of atoms
72. From which the cathode ray particles originate in a discharge tube? – Cathode
73. Einstein’s mass energy relation is given by which expression? – E = mc2
74. Which rays will deflect in electric field? – Cathode rays
75. What percentage of the original quantity of a radioactive material is left after five half lives
approximately? – 3%
76. What is the important conclusion given by Millikan’s experiment about the charge? – Charge is quantized
77. What are Alpha rays emitted from a radioactive substance? – Helium nuclear
78. Which are the Particles that can be added to the nucleus of an atom without changing its chemical
properties? – Neutrons
79. Which particle has similar mass to that of the electron? – Positron
80. When the speed of electrons increases, then what happens in the value of the specific charge on an
electron? – Decreases
81. The colour of the +ve column in a gas discharge tube depends on which thing? – The gas in the tube
82. The first explosion of an atomic device in India was carried out in which state? – Rajasthan
83. Direct conversion of solar energy with the use of photovoltaic cell results in the production of which
energy? – Electrical energy
84. Why is energy is continuously generated in the sun? – Due to nuclear fusion
85. What is the ratio of specific charges of an á-particle to that of a proton? – 1/2
85. Long distance short-wave radio broad casting uses which waves? – Ionospheric wave
86. Which satellite is used in ship-to-shore and shore-to-shore and shore-to-ship communication? – Marisat
87. Which is electrical circuits used to get smooth de output from a rectified circuit called? – Filter
88. When the temperature of semiconductor is increased, what will happen in its electrical conductivity? –
Increases
89. With the rise of temperature, what will happen in the specific resistance of semiconductor? – Decreases
90. The absorption of radio waves by the atmosphere depends on which thing? – Their frequency
91. Which are the space waves are affected seriously by atmospheric conditions? – UHF
92. With which can Radio wave of constant amplitude be generated? – Oscillator
93. What is the electrical circuit used to get smooth DC output from a rectifier circuit called? – Filter
94. If germanium has to be doped with a donor impurity, how should the foreign atom be? – Pentavalent
95. In a p-type semiconductor, Which are the majority charge carriers? – Holes
96. The unidirectional property of a pn-junction is useful for its use as which thing? – Rectifier
97. Which energy of the electron at absolute zero is called? – Fermi energy
98. For television broadcasting, what frequency is employed normally? – 30-300 MHz
99. A zener diode is also a p – n junction diode. It can be used as which regular? – DC voltage regulator 100.