Sign up now
to enroll in courses, follow best educators, interact with the community and track your progress.
Download
181-195: MCQs for General Science for Govt. Exams (UPSC and SSC)
11,677 plays

More
In this lesson, Dr. Roman Saini will discuss the MCQs related to various topics in General Science from Class 6 to Class 8 (Science) NCERT.

Roman Saini is teaching live on Unacademy Plus

Roman Saini
Part of a great founding team at Unacademy with Gaurav, Hemesh. Movies, Guitar, Books, Teaching.

U
Unacademy user
193 k nA BOTH IN KEROSENE GIVEN IN NCERT
plasmodium falciparum
Ay
superb lecture sir...
SM
sir i heard that bromine too found in liquid form at room temperature..
Prashant Mohan
3 years ago
Bromine is the non metal which is liquid in room temperature..Q 192 is about metal..
SM
Sagar M M
3 years ago
thank u
  1. Q181. Consider the following statements regarding Rayon: 1. It is also called as artificial silk 2. It is made by chemical treatment of wood pulp. Choose the correct statement/ statements. a. 1 only b. 2 only c. Both 1 and 2 d. None of the above


  2. Answer: c Explanation: Self-explanatory


  3. Q182. Consider the following statements regarding Nylon: 1. It is the first fully synthetic fibre. 2. It is made from water and air. Choose the correct statement/ statements. a. 1 only b. 2 only c. Both 1 and 2 d. None of the above


  4. Answer: a Explanation: It is made from coal, water and air.


  5. 183. Consider the following statements regarding plastics: 1. They are prepared synthetically. 2. All plastics have the same type of arrangement of units. Choose the correct statement/ statements. a. 1 only b. 2 only c. Both 1 and 2 d. None of the above


  6. Answer: a Explanation: All plastics do not have the same type of arrangement of units. In some it is linear, whereas in others it is cross-linked


  7. 0184. Plastics which get deformed easily on heating and can be bent easily are known as; a. Thermoplastics. b. Thermosetting plastics c. Soft plastics d. Very soft plastics


  8. Answer: a Explanation: Self-explanatory Polythene and PVC are some of the examples of thermoplastics.


  9. Q185. Plastics which when moulded once, cannot be softened by heating are known as; a. Thermoplastics. b. Thermosetting plastics c. Soft plastics d. Electric plastics


  10. Answer:b Explanation: Self-explanatory Examples are bakelite and melamine. Bakelite is a poor conductor of heat and electricity. It is used for making electrical switches, handles of various utensils, etc. Melamine resists fire and can tolerate heat better than other plastics. It is used for making floor tiles, kitchenware and fabrics which resist fire.


  11. Q186. Which of the following plastics is used to make non-stick cook-wares? a. PET b. Teflon c. Polyester d. Black plastic


  12. Answer:b Explanation: Teflon is a special plastic on which oil and water do not stick. It is used for non-stick coating on cook-wares.


  13. Answer: c Explanation: Self-explanatory


  14. Q189. Most of the synthetic fibres are obtained from? a. Nature b. c. gneous rocks Petrochemicals Wood pulp


  15. Answer:b Explanation: The property of metals by which they can be beaten into thin sheets is called malleability. This is a characteristic property of metals. The property of metal by which it can be drawn into wires is called ductility.


  16. 0191. Which of the following is a non-metal? a. Sodium b. Magnesium c. Potassium d. Oxygen


  17. Answer:d Explanation: self-explanatory


  18. 0193. House of the following materials is stored in kerosene? a. Sodium b. Potassium c. Iron d. Uranium


  19. 0194. Which of the following materials is stored in water? a. Sodium b. Potassium c. Iron d. Phosphorus


  20. 0195. What do you understand by metalloids? a. These are synthetic substances which have properties of both metals and non-metals. These are synthetic substances which react with metals as well as non-metals. c. These are elements having the properties of metals as well as non-metals. d. properties of non-metals These are substances formed from matters but having the


  21. Answer: c Explanation: Metalloids are chemical elements with properties intermediate between those of typical metals and non-metals e.g. boron, silicon, germanium, arsenic, antimony, and tellurium.