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Practice Test: General Science- 6 | Science & Technology for UPSC CSE PDF Download

Question 51. The layer of the atmosphere which reflec ts the radiowaves back to the earth is called________ 

Answer:  ionosphere

Question 52. Why does radio reception improve slightly during the night? 

Answer:  Sunlight affects radio broadcasts to some extent during the day

Question 53. Television signals cannot be received ordinarily beyond a particular distance due to________ 

Answer:  curvature of the earth

Question 54. Planets are________ 

Answer: non-luminous bodies that do not twinkle

Question 55. A small hole in the window of a closed room forms an inverted image of outside building on the opposite wall of the room. This happens because________ 

Answer: of the rectilinear propagation of light

Question 56. ________part of the sun is visible during total solar eclipse. 

Answer: corona

Question 57. The minimum length of a plane mirror in which a person can see himself full-length should be________

Answer: nearly half his height

Question 58. If you walk towards a plane mirror at a speed of 10 cm/ s, at what speed does your image approach you? 

Answer: 20 cm/s

Question 59. If you stand in a room, where two adjacent walls are covered with plane mirrors, the total number of your images formed will be________ 

Answer:  infinite

Question 60. ________type of mirror can be used to obtain the real image of an object.

Answer: concave mirror

Question 61. A dentist’s mirror is a________ 

Answer: concave mirror

Question 62. The type of mirror used in the head-lamps of cars is the________

Answer: parabolic concave mirror

Question 63. When a pencil is partly immersed in water in a slanting position, the immersed portion appears________ 

Answer: bent towards the water surface

Question 64. The sun remains visible for some time after it actually sets below the horizon. This happens due to________ 

Answer: atmospheric refraction

Question 65. If there were no atmosphere, the length of the day would________ 

Answer: decrease

Question 66. The sun and moon appear elliptical near the horizon due to________

Answer: refraction

Question 67. The twinkling of stars can be partly attributed to________ 

Answer: atmospheric refraction

Question 68. Planets do not twinkle because________ 

Answer: they are nearer to us and therefore minor variations in their intensity are not noticeable.

Question 69. A rainbow is formed by the________of light by water droplets. 

Answer: dispersion and total internal reflection

Question 70. When white light passes through a glass prism, it gets dispersed into colours because________ 

Answer: different colours have different speeds in glass

Question 71. The three primary colours are________ 

Answer: blue, green and red

Question 72. When a person enters a dark room from bright light, he is not able to see clearly for a little while because the________ 

Answer:  iris is unable to dilate the pupil immediately

Question 73. In old age, people have to wear spectacles for reading and writing because________ 

Answer: they lose the power of accommodation

Question 74. The sky appears blue because________ 

Answer: the atmosphere scatters blue colours more than the others

Question 75. In upper space, astronauts________see stars during the day. 

Answer: can

Question 76. The sun appears deep orange-red before it sets because________

Answer: its light has to traverse, a thicker atmosphere, therefore, other colours get scattered and do not reach us

Question 77. Soap bubbles show multiple colours when viewed in white light because of________ 

Answer: the interference of the reflected light

Question 78. The technique of recording and reproducing three-dimensional images of objects is known as________ 

Answer: holography

Question 79. When a wave goes from one place to another, it transports________ 

Answer: energy

Question 80. The pitch (or shrillness) of a sound is determined by its________ 

Answer:  frequency

Question 81. A woman’s voice is shriller than a man’s due to________ 

Answer: higher frequency

Question 82. The loudness of a sou nd wave is determi ned by its________ 

Answer: amplitude

Question 83. Sounds cannot travel through________ 

Answer: vacuum

Question 84. Thunder is heard much after a flash of lightning is seen because________ 

Answer: light travels much faster than sound

Question 85. Mach number is used in connection with the speed of________ 

Answer: aircraft

Question 86. A clearly separate echo of a sound is heard when the minimum distance of the reflecting surface from the source of sound is________ 

Answer: 17 m

Question 87. The walls and ceiling of an auditorium are covered with fibrous material, such as glass fibre, to________

Answer: absorb sound and prevent echoes

Question 88. A police van sounding its siren is moving away from an observer. The pitch (shrillness) of the sound from the siren relative to its normal pitch is________

Answer: lower

Question 89. A device used for measuring the depth of the sea is called________ 

Answer: fathometer

Question 90. If a bar magnet, tied in the middle with a thread, were suspended at the north pole of the earth, it would take________ 

Answer: a nearly vertical position with its north pole pointing downward

Question 91. The crackling sound, heard when dry hair is combed with a hard rubber comb, is due to________ 

Answer: small electric sparks

Question 92. A capacitor (condenser) is used in an electrical circuit to________ 

Answer: store electric charge

Question 93. ‘IC chips’ for computers are usually made of________

Answer: silicon

Question 94. Nichrome wire is used as a heating element in many appliances because________ 

Answer:  it has high resistivity and it resists oxidation in air when red hot

Question 95. The starting current of an electric motor is________the current flowing after the motor reaches its normal running speed. 

Answer:  much greater than

Question 96. Energy conversions in a loudspeaker are________ 

Answer: electrical to mechanical to sound

Question 97. Ener gy conversion s takin g plac e in a microphone are________ 

Answer: sound to mechanical to electrical

Question 98. A transformer is a device for________ 

Answer: stepping up (or down) ac voltage

Question 99. In our houses we get 220 V ac . The value 220 represents________voltage. 

Answer: effective

Question 100. The advantage of ac over dc is that________it can be transmitted over long distances with________loss.

Answer: minimum power

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FAQs on Practice Test: General Science- 6 - Science & Technology for UPSC CSE

1. What is the study of general science?
Ans. General science is a broad field of study that encompasses various branches of science, including physics, chemistry, biology, and earth science. It involves the exploration and understanding of the natural world through observation, experimentation, and analysis.
2. Why is general science important?
Ans. General science is important because it helps us understand the world around us and provides a foundation for further scientific advancements. It allows us to make informed decisions, solve problems, and develop critical thinking skills. Additionally, general science plays a crucial role in technological advancements and the development of new discoveries.
3. How is general science different from specialized sciences?
Ans. General science covers a wide range of scientific disciplines, providing a broad overview of various fields. It focuses on the fundamental principles and concepts that apply across multiple branches of science. On the other hand, specialized sciences concentrate on specific areas of study, delving deeper into a particular branch of science.
4. What are the main branches of general science?
Ans. The main branches of general science include physics, chemistry, biology, and earth science. Physics deals with the study of matter, energy, and the interactions between them. Chemistry focuses on the composition, properties, and reactions of substances. Biology explores living organisms and their processes. Earth science examines the Earth's structure, geological processes, and phenomena.
5. How can one pursue a career in general science?
Ans. To pursue a career in general science, one can start by obtaining a bachelor's degree in a related field, such as physics, chemistry, biology, or earth science. Further specialization can be achieved through pursuing a master's or doctoral degree in a specific area of interest. Additionally, gaining practical experience through internships, research projects, and scientific work can enhance career prospects in general science.
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