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Practice Test: General Science- 10 | Science & Technology for UPSC CSE PDF Download

Question 51. ‘Gobar gas’ contains mainly________ 

Answer: methane

Question 52. In an atom no two electrons have all the four quantum numbers identica. This is known as________ 

Answer: Pauli’s Exclusion Principle

Question 53. Acid precipitation is now regarded as a serious problem in some European and Asian countries. Its major cause or source is________ 

Answer: emissions of sulphur oxides and nitrogen oxides from thermal power plants and burning of fossil fuels; these oxides dissolve in atmospheric water vapour and fall back on earth as acid rain.

Question 54. Vinegar is an aqueous solution of________ 

Answer: acetic acid

Question 55. The acid that can be used as a hypnotic is________ 

Answer: barbituric acid

Question 56. The most malleable metal is________

Answer: gold 

Question 57. The hottest part of the gas flame is known as the_____ 

Answer: nonluminous zone

Question 58. Camphor can easily be purified by the process of_____ 

Answer: sublimation

Question 59. The gas us ed for artificial ripening of green fruit is_____ 

Answer: ethylene

Question 60. A balanced fertiliser for plants is________ 

Answer: compost

Question 61. In order to lower the temperature below 0°C, the substance mixed with ice is________ 

Answer: sodium chloride

Question 62. The method that can not be used for removing permanent hardness of water is________ 

Answer: boiling

Question 63. The National Chemical Laboratory is situated in_____ 

Answer: Pune

Question 64. Petroleum is found in________rock. 

Answer: igneous

Question 65. The main active constituent of tea and coffee is_____ 

Answer: caffeine

Question 66. Containers for carrying strong acids are made of____

Answer: lead

Question 67. The branch of chemistry dealing with the accurate determination of the amounts of various substances is called________ 

Answer:  analytical chemistry

Question 68. The main use of salt in the diet is to________ 

Answer: produce in s mall amounts the hydrochloric acid required for the digestion of food

Question 69. The gas used in the manufacture of vanaspati from vegetable oil is________ 

Answer: Hydrogen

Question 70. A flaming splinter is thrust into a bottle of oxygen, a bottle of nitrogen, and a bottle of carbon dioxide. The flame will go out in________ 

Answer: Nitrogen and Carbon dioxide but not in Oxygen

Question 71. ________is the measure of performance of petrol in internal combustion engines. 

Answer: Octane number

Question 72. Of the Beer, Vodka, Wine and Gin drinks, tell which one has the lowest alcohol content_____ 

Answer: Beer

Question 73. Soda water contains________ 

Answer: Carbonic acid

Question 74. Cooking gas supplied in cylinders by gas agencies is_ 

Answer: liquid

Question 75. For the production of iron, the raw material used is___ 

Answer: coke

Question 76. Paracetamol relieves________ 

Answer: body pain

Question 77. Chloromycetin is________ 

Answer: antibacterial

Question 78. In the industrial production of vegetable ghee, the process involved is________

Answer: reduction

Question 79. Chemically, cane sugar is________

Answer: sucrose

Question 80. For respiration, deep-sea divers use a mixture of_____

Answer: oxygen and nitrogen

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FAQs on Practice Test: General Science- 10 - Science & Technology for UPSC CSE

1. What is the scientific method?
Ans. The scientific method is a systematic approach used by scientists to investigate and understand phenomena in the natural world. It involves a series of steps, including making observations, formulating a hypothesis, conducting experiments, collecting data, analyzing the results, and drawing conclusions.
2. How does photosynthesis work?
Ans. Photosynthesis is the process by which plants and some other organisms convert light energy into chemical energy, which is stored in the form of glucose. It involves the absorption of light by chlorophyll in the plant's leaves, which then triggers a series of chemical reactions that convert carbon dioxide and water into glucose and oxygen.
3. What is the difference between an element and a compound?
Ans. An element is a pure substance that cannot be broken down into simpler substances by chemical means. It is made up of only one type of atom. In contrast, a compound is a substance composed of two or more different elements that are chemically combined in a fixed ratio. Compounds can be broken down into their constituent elements through chemical reactions.
4. What are the three states of matter?
Ans. The three states of matter are solid, liquid, and gas. In the solid state, particles are tightly packed together and have a fixed shape and volume. In the liquid state, particles are close together but can move past each other, resulting in a definite volume but no fixed shape. In the gas state, particles are far apart and move freely, resulting in no fixed shape or volume.
5. What is the difference between a physical change and a chemical change?
Ans. A physical change is a change in the physical properties of a substance, such as its shape, size, or state of matter, without altering its chemical composition. Examples include melting ice or boiling water. In contrast, a chemical change is a change that results in the formation of new substances with different chemical properties. Examples include burning wood or rusting iron.
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