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Physics Questions and Answers For Competitive Exams
Q1. Light year is a measurement of
Q2. An instrument used to measure humidity is
Q3. Why is sound heard with more intensity through CO2 than through the air?
Q4. This strain of rice was one of the first High Yielding Varieties of seeds developed in the world. Name it
Q5. Ice is packed in saw dust because
Q6. Sound travel fastest in
Q7. Mirage is observed in a desert due to the phenomenon of
Q8. If the earth were to spin faster, acceleration due to gravity at the polesÂ
Q9. The process of combining strings is known as
Q10. When a charged particle entres a uniform magnetic field its kinetic energy
Q11. For an astronaut in a space ship, the sky appears
Q12. Earth Summit was held in
Q13. What is the principle by which a cooling system (Radiator) in a motor car works?
Q14. If the pressure in closed vessel is reduced by drawing out some gas, the mean free path of the gas molecules will
Q15. The natural disaster in which carbon-di-oxide suddenly erupts from a deep lake water is known as
Q16. A carbon microphone is best used in
Q17. Perspiration cools the body because
Q18. The swift movement of the falling water droplets along with the rising air create lightning and sound. It is this event that we call a ___________.
Q19. If an object travels in a straight line and its velocity increases or decreases by equal amounts in equal intervals of time, then the acceleration of the object is said to be ___________.
Q20. HEPA filters are used to remove microbes from
Q21. Cold air is __________.
Q22. The attenuation in optical fibre is mainly due to
Q23. Sound is a form of __________ which produces a sensation of hearing in our ears.
Q24. The rate of change of linear momentum of a body is proportional to the ___________ acting on it.
Q25. The SI unit of G, the universal gravitation constant is ___________.
Q26. Sunspots appear dark because they are
Q27. The resistance of an ideal ammeter is
Q28. The mass number of an atom is determined by
Q29. The depletion of Ozone layer is mainly due to
Q30. A symbiotic relationship in which both species benefit is best described as ________.
Q31. In optical instrument, the lenses are used to form image by the phenomenon of
Q32. If there were no atmosphere, the length of the day on the earth will
Q33. A glass container cracks when very hot tea is poured into it. A probable reason for this is the
Q34. The temperature of water at the bottom of a waterfall is higher than that at the top because
Q35. In a pressure cooker the cooking is fast because
Q36. Laser light is considered to be coherent because it consists of
Q37. Heat is transmitted from higher to lower temperature through actual mass motion of the molecules in
Q38. The rapidly growing mass of phytoplankton covering the surface water of lake or pond is known as:
Q39. Light from the sun reaches upon in nearly
Q40. Sound waves do not exhibit the phenomenon of
Q41. Sensitivity of potentiometer can be increased by
Q42. The power of an earthquake is expressed in terms of a magnitude on a scale called ________ scale.
Q43. A solar eclipse occurs when
Q44. Diamond does not conduct electricity, because
Q45. _____________ states that the ratio of the potential difference across a conductor to the current flowing through it, is a constant, provided that its physical conditions, such as temperature, remain constant.
Q46. Nautical miles is a unit of distance used in
Q47. When the vibrating object moves forward, it creates a region of high pressure in the medium called _________.
Q48. Humidity is a measure of the ____________.
Q49. The instrument used for measuring air pressure is called __________
Q50. What is the unit of the physical quantity “Magnetic field strength”?
Q51. According to the Second Law of Motion, for a given force, acceleration is inversely proportional to the _________ of an object.
Q52. If the force applied on the object is in the direction of its motion, the speed of the object __________.
Q53. Device used for the detection and measurement of all types of radiation (alpha, beta and gamma)
Q54. __________ is defined as the force acting per unit current per unit length on a wire placed at right angles to the magnetic field.
Q55. For what is Radiocarbon dating technique used?
Q56. The area under a Velocity-Time graph represents ___________.
Q57. Terminal velocity __________.
Q58. During the night, the direction of the wind would be from the _____________.
Q59. ____________is a measure of the actual amount of water vapour in a particular sample of air: measured as a partial pressure.
Q60. Rate of work done is __________.
Q61. Which type of electromagnetic radiation has the shortest wavelength?
Q62. In the context of nonÂ-conventional energy, what is the meaning of ‘OTE’ ?
Q63. Convex and concave mirrors are examples of?
Q64. The volume of air delivered by the compressor is called
Q65. ______________states that the induced e.m.f. is directly proportional to the rate of change of magnetic flux linkage or rate of cutting of magnetic flux linkage.
Q66. Acceleration is
Q67. Instrument used for measuring specific gravity is called
Q68. The phenomenon of change in direction of light when it passes from one medium to another is called
Q69. What is the unit of calorific value?
Q70. Which rays cause skin damage?
Q71. If ice floating on water in a vessel melts, the water level in the vessel ___________.
Q72. Rectifiers convert __________.
Q73. _________ is a measure of the moisture in air.
Q74. If the force applied on the object is in the direction opposite to the direction of motion, the speed of the object ____________.
Q75. AV= constant, where A= area of cross-section and V= velocity of fluid. This equation is called
Q76. Air expands when it ___________.
Q77. Newton’s first law is also known as ___________.
Q78. Friction is caused by the ___________ on the two surfaces in contact.
Q79. If the radius of the earth decreases and its mass remains the same, then the value of “acceleration due to gravity” will _________.
Q80. Blood pressure is measured by __________.
Q81. Who proposed Continental drift theory?
Q82. Creating realistic sounds in animation is called
Q83. ____________ states that the total current entering a junction is equal to the total current leaving the junction.
Q84. Why is weightlessness experienced while orbiting the earth in space ships ?
Q85. Addition of suitable impurities into semiconductor, is called
Q86. Instrument for measuring time is called
Q87. The SI unit of intensity of sound is
Q88. A transformer can do all of the following except
Q89. _________ mirror is used in the headlights of cars.
Q90. For what is Mohs scale used?
Q91. In hydel power station, the motion produced in turbines is due to
Q92. Two vectors are said to be equal if
Q93. Instrument for measuring low temperatures is called
Q94. Which device is used to measure the depth of ocean?
Q95. Acceleration due to gravity on a planet decreases with ___________.
Q96. The reflection formed by the plane mirror is ____________.
Q97. The complete form of ‘IC’ in electronics is
Q98. Who first determined the value of G (gravitational constant)?
Q99. Instrument for measuring work performed is called _________.
Q100. In a qualitative way, the tendency of undisturbed objects to stay at rest or to keep moving with the same velocity is called __________.
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