General Science

1. A current of 2 A flows through a 5 ohm resistor for 10 seconds. The heat produced is BPSC TRE 4 General Science practice set 1 2. During normal respiration in a mammal, the diaphragm is BPSC TRE 4 General Science practice set 3 3. The most important cell type associated with the immunity of the body is BPSC TRE 4 General Science practice set 3 4. A piece of wire of resistance R is cut into 5 equal parts. These parts are then connected in parallel. If the equivalent resistance of the combination is R, then the ratio R/R is BPSC TRE 4 General Science practice set 1 5. An electric heater of resistance 8 ohm draws 15 A current from the mains. What is the rate at which heat is developed in the heater? BPSC TRE 4 General Science practice set 1 6. Which of the following lenses would you prefer to use while reading small letters found in a dictionary? BPSC TRE 4 General Science practice set 1 7. The human eye forms the image of an object at its ________ BPSC TRE 4 General Science practice set 1 8. Which of the following is not a part of the female reproductive system in human beings? BPSC TRE 4 General Science practice set 1 9. The anther contains _________ BPSC TRE 4 General Science practice set 1 10. Asexual reproduction takes place through budding in ______ BPSC TRE 4 General Science practice set 1 11. Which one of the following types of medicines is used for treating indigestion? BPSC TRE 4 General Science practice set 1 12. Ginger is an underground stem and not a root because BPSC TRE 4 General Science practice set 2 13. The focal length of a convex lens is fL = 10 cm. On immersing in water, it will act as a BPSC TRE 4 General Science practice set 2 14. Though water is transparent to visible light, it is not possible to see distant objects in fog which consists of fine drops of water. This is so because BPSC TRE 4 General Science practice set 2 15. Monochromatic light enters from one medium to the other. Which one of the following properties does not change? BPSC TRE 4 General Science practice set 2 16. The speed of an electron in the orbit of the hydrogen atom in the ground state is BPSC TRE 4 General Science practice set 2 17. Which of the following is an example of a chemical reaction? BPSC TRE 4 General Science practice set 4 18. A blackbody radiates energy at the rate of E watt per metre 2 at a high temperature T K. When the temperature is reduced to T/3 K, the radiant energy will be BPSC TRE 4 General Science practice set 2 19. The acid which can destroy the colour of acidic KMnO4 is BPSC TRE 4 General Science practice set 2 20. An isotropic source of 2 candela produces light flux equal to BPSC TRE 4 General Science practice set 3 21. The spray bottles used as window or household cleaner or perfume sprayer work on BPSC TRE 4 General Science practice set 3 22. The trade name of basic lead carbonate is BPSC TRE 4 General Science practice set 3 23. The trade name of basic lead carbonate is BPSC TRE 4 General Science practice set 3 24. Which of the following elements has the largest atomic radius? BPSC TRE 4 General Science practice set 3 25. The phenomenon of photoperiodism in plants was discovered by BPSC TRE 4 General Science practice set 3 26. During normal inspiration, the diaphragm BPSC TRE 4 General Science practice set 3 27. Which type of lymphocyte produces antibodies? BPSC TRE 4 General Science practice set 3 28. A wire of resistance 20 ohm is cut into 4 equal parts. The resistance of each part is BPSC TRE 4 General Science practice set 1 29. A current of 5 A flows through a resistor of resistance 4 ohm. The power dissipated in the resistor is BPSC TRE 4 General Science practice set 1 30. Which type of lens is commonly used as a magnifying glass? BPSC TRE 4 General Science practice set 1 31. Which part of the human eye controls the amount of light entering the eye? BPSC TRE 4 General Science practice set 1 32. Which organ produces ova in the female reproductive system? BPSC TRE 4 General Science practice set 1 33. Which of the following is the male reproductive part of a flower? BPSC TRE 4 General Science practice set 1 34. Which type of asexual reproduction occurs in Amoeba? BPSC TRE 4 General Science practice set 1 35. Which type of medicine is commonly used to treat bacterial infections? BPSC TRE 4 General Science practice set 1 36. Which type of modified stem is found in ginger? BPSC TRE 4 General Science practice set 2 37. When a convex lens is immersed in a liquid having the same refractive index as the lens material, it will BPSC TRE 4 General Science practice set 2 38. The blue colour of the sky is mainly due to BPSC TRE 4 General Science practice set 2 39. When light passes from air into glass, which quantity remains unchanged? BPSC TRE 4 General Science practice set 2 40. According to the Bohr model, the speed of an electron in the nth orbit of a hydrogen atom is proportional to BPSC TRE 4 General Science practice set 2 41. Which of the following is a chemical change? BPSC TRE 4 General Science practice set 4 42. According to Stefan-Boltzmann law, the radiant energy emitted per unit area per unit time by a blackbody is proportional to BPSC TRE 4 General Science practice set 2 43. Which acid is commonly used as a reducing agent in the reaction with acidified KMnO4? BPSC TRE 4 General Science practice set 2 44. An isotropic source has luminous intensity of 5 candela. Its total luminous flux is BPSC TRE 4 General Science practice set 3 45. According to Bernoulli's principle, when the speed of a flowing fluid increases, its pressure generally BPSC TRE 4 General Science practice set 3 46. The chemical formula of white lead is BPSC TRE 4 General Science practice set 3 47. The chemical formula of white lead is BPSC TRE 4 General Science practice set 3 48. Which of the following elements has the smallest atomic radius among Li, Be and B? BPSC TRE 4 General Science practice set 3 49. Garner and Allard studied photoperiodism particularly through experiments on which tobacco variety? BPSC TRE 4 General Science practice set 3 50. During normal expiration, the diaphragm generally BPSC TRE 4 General Science practice set 3 51. Which cells are primarily responsible for cell-mediated immunity? BPSC TRE 4 General Science practice set 3 52. Four identical resistors, each of resistance R, are connected in parallel. Their equivalent resistance is BPSC TRE 4 General Science practice set 1 53. A resistor of resistance 10 ohm is connected across a 20 V supply. The power consumed by the resistor is BPSC TRE 4 General Science practice set 1 54. A convex lens has a focal length of 20 cm. Its power is BPSC TRE 4 General Science practice set 1 55. Which part of the human eye acts as a screen on which the image is formed? BPSC TRE 4 General Science practice set 1 56. Which organ is the usual site of implantation of the embryo in human females? BPSC TRE 4 General Science practice set 1 57. Which of the following is the female reproductive part of a flower? BPSC TRE 4 General Science practice set 1 58. Which type of asexual reproduction occurs in Plasmodium? BPSC TRE 4 General Science practice set 1 59. Which type of medicine is used to relieve pain? BPSC TRE 4 General Science practice set 1 60. Which of the following is an example of a stem tuber? BPSC TRE 4 General Science practice set 2 61. The power of a convex lens of focal length 50 cm is BPSC TRE 4 General Science practice set 2 62. The reddish appearance of the Sun near the horizon is mainly due to BPSC TRE 4 General Science practice set 2 63. When light enters a denser medium from a rarer medium, its speed generally BPSC TRE 4 General Science practice set 2 64. If the speed of an electron in the first orbit of hydrogen is c/137, its speed in the second orbit is BPSC TRE 4 General Science practice set 2 65. Which gas is released when an acid reacts with a metal carbonate? BPSC TRE 4 General Science practice set 4 66. If the absolute temperature of a blackbody is doubled, its radiant energy emitted per unit area becomes BPSC TRE 4 General Science practice set 2 67. The purple colour of acidified KMnO4 disappears during its reaction with oxalic acid because BPSC TRE 4 General Science practice set 2 68. One candela is equivalent to luminous flux of how much per steradian? BPSC TRE 4 General Science practice set 3 69. The working of an atomizer or perfume sprayer is primarily based on BPSC TRE 4 General Science practice set 3 70. The trade name of lead tetroxide (Pb3O4) is BPSC TRE 4 General Science practice set 3 71. The trade name of lead tetroxide (Pb3O4) is BPSC TRE 4 General Science practice set 3 72. The atomic radius generally decreases from left to right across a period because BPSC TRE 4 General Science practice set 3 73. Photoperiodism refers to the response of plants mainly to BPSC TRE 4 General Science practice set 3 74. The main muscle responsible for quiet inspiration is the BPSC TRE 4 General Science practice set 3 75. Which blood cells are primarily responsible for carrying oxygen? BPSC TRE 4 General Science practice set 3 76. Three identical resistors, each of resistance 6 ohm, are connected in parallel. The equivalent resistance is BPSC TRE 4 General Science practice set 1 77. A concave lens has a focal length of 50 cm. Its power is BPSC TRE 4 General Science practice set 1 78. Which part of the eye changes its curvature to help focus objects at different distances? BPSC TRE 4 General Science practice set 1 79. Which structure carries the ovum from the ovary toward the uterus? BPSC TRE 4 General Science practice set 1 80. The ovules in a flower are present inside the BPSC TRE 4 General Science practice set 1 81. In budding, a new organism develops as an outgrowth from the BPSC TRE 4 General Science practice set 1 82. Which substance is commonly used as an antacid? BPSC TRE 4 General Science practice set 1 83. The eyes of a potato represent BPSC TRE 4 General Science practice set 2 84. A lens has a focal length of 25 cm. Its power is BPSC TRE 4 General Science practice set 2 85. Why are danger signals generally red in colour? BPSC TRE 4 General Science practice set 2 86. When light enters glass from air, its wavelength generally BPSC TRE 4 General Science practice set 2 87. The approximate value of the fine-structure constant is BPSC TRE 4 General Science practice set 2 88. Which type of reaction occurs when two or more substances combine to form a single product? BPSC TRE 4 General Science practice set 4 89. If the absolute temperature of a blackbody is tripled, its radiant energy emitted per unit area becomes BPSC TRE 4 General Science practice set 2 90. In acidic medium, the reduction product of permanganate ion MnO4− is BPSC TRE 4 General Science practice set 2 91. The total solid angle around a point is BPSC TRE 4 General Science practice set 3 92. In a horizontal pipe, water flows through a narrow section. Compared with the wider section, the speed of water in the narrow section is BPSC TRE 4 General Science practice set 3 93. The compound PbO is commonly known by the trade name BPSC TRE 4 General Science practice set 3 94. The compound PbO is commonly known by the trade name BPSC TRE 4 General Science practice set 3 95. The atomic radius generally increases down a group because BPSC TRE 4 General Science practice set 3 96. A plant that flowers when the day length is shorter than a critical value is generally called a BPSC TRE 4 General Science practice set 3 97. Contraction of the diaphragm during inspiration causes the volume of the thoracic cavity to BPSC TRE 4 General Science practice set 3 98. Which blood component is mainly involved in blood clotting? BPSC TRE 4 General Science practice set 3 99. Two resistors of 6 ohm and 3 ohm are connected in parallel. Their equivalent resistance is BPSC TRE 4 General Science practice set 1 100. An electric bulb is rated 100 W, 200 V. The current drawn by the bulb at its rated voltage is BPSC TRE 4 General Science practice set 1 101. When an object is placed between the optical centre and focus of a convex lens, the image formed is BPSC TRE 4 General Science practice set 1 102. The ability of the eye lens to change its focal length according to the distance of the object is called BPSC TRE 4 General Science practice set 1 103. In human beings, fertilization normally takes place in the BPSC TRE 4 General Science practice set 1 104. Which part of the flower receives pollen grains during pollination? BPSC TRE 4 General Science practice set 1 105. Which organism commonly reproduces by budding? BPSC TRE 4 General Science practice set 1 106. Which acid is mainly present in the gastric juice of the human stomach? BPSC TRE 4 General Science practice set 1 107. Which of the following is a modified underground stem? BPSC TRE 4 General Science practice set 2 108. Which type of lens is used to correct myopia? BPSC TRE 4 General Science practice set 2 109. The phenomenon responsible for the blue colour of the sky is BPSC TRE 4 General Science practice set 2 110. The frequency of light is determined by the BPSC TRE 4 General Science practice set 2 111. The speed of light in vacuum is approximately how many times the speed of an electron in the first Bohr orbit of hydrogen? BPSC TRE 4 General Science practice set 2 112. What is the audible frequency range of the human ear? BPSC TRE 4 General Science practice set 4 113. If the temperature of a blackbody is reduced to half its original absolute temperature, its radiant energy becomes BPSC TRE 4 General Science practice set 2 114. The oxidation state of manganese in KMnO4 is BPSC TRE 4 General Science practice set 2 115. A point source of luminous intensity 10 candela illuminates a surface normally at a distance of 2 m. The illuminance is BPSC TRE 4 General Science practice set 3 116. The equation P + 1/2ρv² + ρgh = constant represents BPSC TRE 4 General Science practice set 3 117. The mineral name of lead(II) sulfide, PbS, is BPSC TRE 4 General Science practice set 3 118. The mineral name of lead(II) sulfide, PbS, is BPSC TRE 4 General Science practice set 3 119. Which of the following has the largest atomic radius? BPSC TRE 4 General Science practice set 3 120. Which of the following is a commonly cited short-day plant? BPSC TRE 4 General Science practice set 3 121. According to Boyle's law, if the volume of a gas-filled cavity increases at constant temperature, its pressure BPSC TRE 4 General Science practice set 3 122. Which immunoglobulin is generally the most abundant antibody in human blood serum? BPSC TRE 4 General Science practice set 3 123. Two resistors of 4 ohm and 6 ohm are connected in series. Their equivalent resistance is BPSC TRE 4 General Science practice set 1 124. An electrical appliance operates at 220 V and draws a current of 5 A. Its power consumption is BPSC TRE 4 General Science practice set 1 125. Which type of image is always formed by a concave lens for a real object? BPSC TRE 4 General Science practice set 1 126. Which type of lens is used to correct myopia? BPSC TRE 4 General Science practice set 1 127. Which of the following is a male reproductive organ? BPSC TRE 4 General Science practice set 1 128. Which structure connects the stigma with the ovary in a flower? BPSC TRE 4 General Science practice set 1 129. Which of the following is an example of asexual reproduction by fragmentation? BPSC TRE 4 General Science practice set 1 130. Which organ produces hydrochloric acid as part of gastric juice? BPSC TRE 4 General Science practice set 1 131. Which plant has a bulb as a modified underground stem? BPSC TRE 4 General Science practice set 2 132. Which type of lens is used to correct hypermetropia? BPSC TRE 4 General Science practice set 2 133. Which phenomenon makes the path of a light beam visible when it passes through smoke? BPSC TRE 4 General Science practice set 2 134. A light wave has a frequency of 6 × 10^14 Hz in air. Its frequency in glass will be BPSC TRE 4 General Science practice set 2 135. In the Bohr model of hydrogen, the angular momentum of the electron in the nth orbit is BPSC TRE 4 General Science practice set 2 136. Sound having a frequency greater than 20,000 Hz is called BPSC TRE 4 General Science practice set 4 137. A blackbody emits radiant energy at the rate E per unit area at temperature T. At temperature 2T, the rate will be BPSC TRE 4 General Science practice set 2 138. In the reaction between acidified KMnO4 and oxalic acid, oxalic acid is BPSC TRE 4 General Science practice set 2 139. If the distance from an isotropic point source is doubled, the illuminance becomes BPSC TRE 4 General Science practice set 3 140. The lifting of an airplane wing is commonly explained using BPSC TRE 4 General Science practice set 3 141. The mineral name of lead(II) carbonate, PbCO3, is BPSC TRE 4 General Science practice set 3 142. The mineral name of lead(II) carbonate, PbCO3, is BPSC TRE 4 General Science practice set 3 143. Which of the following has the smallest atomic radius? BPSC TRE 4 General Science practice set 3 144. Which of the following is a commonly cited long-day plant? BPSC TRE 4 General Science practice set 3 145. Air enters the lungs during inspiration mainly because the pressure inside the lungs becomes BPSC TRE 4 General Science practice set 3 146. Which immunoglobulin is mainly associated with allergic reactions? BPSC TRE 4 General Science practice set 3 147. A wire has resistance R. If its length is doubled while its cross-sectional area remains unchanged, its new resistance will be BPSC TRE 4 General Science practice set 1 148. A heater of resistance 10 ohm is connected to a 100 V supply. The current through the heater is BPSC TRE 4 General Science practice set 1 149. If the focal length of a convex lens is decreased, its power BPSC TRE 4 General Science practice set 1 150. Which type of lens is used to correct hypermetropia? BPSC TRE 4 General Science practice set 1 151. Which duct carries sperm from the epididymis toward the urethra in the male reproductive system? BPSC TRE 4 General Science practice set 1 152. The transfer of pollen grains from anther to stigma is called BPSC TRE 4 General Science practice set 1 153. Which organism reproduces asexually by spore formation? BPSC TRE 4 General Science practice set 1 154. Which type of medicine is used to reduce fever and relieve mild pain? BPSC TRE 4 General Science practice set 1 155. Which of the following is a modified root used for food storage? BPSC TRE 4 General Science practice set 2 156. If the focal length of a convex lens is decreased, its power will BPSC TRE 4 General Science practice set 2 157. The Tyndall effect is related to BPSC TRE 4 General Science practice set 2 158. The speed of light in vacuum is approximately BPSC TRE 4 General Science practice set 2 159. The radius of the nth Bohr orbit of a hydrogen atom is proportional to BPSC TRE 4 General Science practice set 2 160. Sound having a frequency below 20 Hz is known as BPSC TRE 4 General Science practice set 4 161. The Stefan-Boltzmann constant is represented by BPSC TRE 4 General Science practice set 2 162. Which of the following is a strong oxidising agent in acidic medium? BPSC TRE 4 General Science practice set 2 163. The SI unit of luminous flux is BPSC TRE 4 General Science practice set 3 164. Water flows through a pipe of cross-sectional area 4 cm² with speed 3 m/s. If the area becomes 2 cm², the speed becomes BPSC TRE 4 General Science practice set 3 165. The mineral name of lead(II) sulfate, PbSO4, is BPSC TRE 4 General Science practice set 3 166. The mineral name of lead(II) sulfate, PbSO4, is BPSC TRE 4 General Science practice set 3 167. Which element has the largest atomic radius among Na, Mg, Si and Cl? BPSC TRE 4 General Science practice set 3 168. Which of the following is generally classified as a day-neutral plant? BPSC TRE 4 General Science practice set 3 169. The exchange of oxygen and carbon dioxide between alveolar air and blood occurs mainly by BPSC TRE 4 General Science practice set 3 170. Which type of white blood cell can differentiate into antibody-secreting plasma cells? BPSC TRE 4 General Science practice set 3 171. A wire has resistance R. If its cross-sectional area is doubled while its length remains unchanged, its new resistance will be BPSC TRE 4 General Science practice set 1 172. An electric heater consumes 2 kW of power for 3 hours. The electrical energy consumed is BPSC TRE 4 General Science practice set 1 173. The SI unit of power of a lens is BPSC TRE 4 General Science practice set 1 174. In a normal human eye, the image formed on the retina is BPSC TRE 4 General Science practice set 1 175. Which hormone is mainly produced by the ovaries and helps regulate the female reproductive cycle? BPSC TRE 4 General Science practice set 1 176. What is the usual result of fertilization in flowering plants? BPSC TRE 4 General Science practice set 1 177. Which of the following is NOT an example of asexual reproduction? BPSC TRE 4 General Science practice set 1 178. Which of the following is a common symptom of indigestion? BPSC TRE 4 General Science practice set 1 179. Which feature is characteristic of a stem rather than a typical root? BPSC TRE 4 General Science practice set 2 180. The SI-related practical unit of power of a lens is BPSC TRE 4 General Science practice set 2 181. Stars appear to twinkle mainly because of BPSC TRE 4 General Science practice set 2 182. The refractive index of a medium is defined as the ratio of BPSC TRE 4 General Science practice set 2 183. The energy of an electron in the nth orbit of a hydrogen atom is proportional to BPSC TRE 4 General Science practice set 2 184. Which characteristic of sound determines its pitch? BPSC TRE 4 General Science practice set 4 185. For a perfect blackbody, the emissive power is given by BPSC TRE 4 General Science practice set 2 186. The colour of aqueous potassium permanganate is mainly due to BPSC TRE 4 General Science practice set 2 187. The SI unit of illuminance is BPSC TRE 4 General Science practice set 3 188. Pascal's law is the basic principle behind BPSC TRE 4 General Science practice set 3 189. Which compound is commonly called minium? BPSC TRE 4 General Science practice set 3 190. Which compound is commonly called minium? BPSC TRE 4 General Science practice set 3 191. Which of the following correctly represents the atomic radius order from largest to smallest? BPSC TRE 4 General Science practice set 3 192. In photoperiodism, the organ that primarily perceives the photoperiodic signal is the BPSC TRE 4 General Science practice set 3 193. The tiny air sacs in the lungs where most gaseous exchange occurs are called BPSC TRE 4 General Science practice set 3 194. Which organ is considered a primary lymphoid organ where T lymphocytes mature? BPSC TRE 4 General Science practice set 3 195. If a wire is stretched to twice its original length without changing its volume, its new resistance becomes BPSC TRE 4 General Science practice set 1 196. If the current through a resistor is doubled while its resistance remains constant, the heat produced per second becomes BPSC TRE 4 General Science practice set 1 197. A lens has a power of +4 D. Its focal length is BPSC TRE 4 General Science practice set 1 198. The least distance of distinct vision for a normal human eye is approximately BPSC TRE 4 General Science practice set 1 199. Which hormone is mainly associated with the development of male secondary sexual characteristics? BPSC TRE 4 General Science practice set 1 200. After fertilization in a flowering plant, the ovule generally develops into a BPSC TRE 4 General Science practice set 1 201. How many parent organisms are generally involved in asexual reproduction? BPSC TRE 4 General Science practice set 1 202. Antacids primarily work by BPSC TRE 4 General Science practice set 1 203. Which underground stem is characterized by a horizontal growth habit and distinct nodes and internodes? BPSC TRE 4 General Science practice set 2 204. A convex lens has a focal length of 20 cm. Its power is BPSC TRE 4 General Science practice set 2 205. The Sun appears flattened near the horizon mainly because of BPSC TRE 4 General Science practice set 2 206. If the refractive index of glass is 1.5, the speed of light in glass is approximately BPSC TRE 4 General Science practice set 2 207. The energy of an electron in the ground state of hydrogen atom is BPSC TRE 4 General Science practice set 2 208. Which chemical compound in onion causes tears in the eyes? BPSC TRE 4 General Science practice set 4 209. A blackbody has radiant power per unit area E at temperature T. If its temperature becomes T/2, what fraction of the original radiant power per unit area remains? BPSC TRE 4 General Science practice set 2 210. When acidified KMnO4 acts as an oxidising agent, the purple colour disappears when MnO4− is reduced to BPSC TRE 4 General Science practice set 2 211. A 4 candela isotropic source produces total luminous flux equal to BPSC TRE 4 General Science practice set 3 212. The instrument used to measure pressure difference in a flowing fluid using the pressure change in a constricted passage is BPSC TRE 4 General Science practice set 3 213. Which of the following is a traditional white pigment containing basic lead carbonate? BPSC TRE 4 General Science practice set 3 214. Which of the following is a traditional white pigment containing basic lead carbonate? BPSC TRE 4 General Science practice set 3 215. Which pair represents elements belonging to the same group and shows increasing atomic radius from top to bottom? BPSC TRE 4 General Science practice set 3 216. Which pigment plays an important role in sensing red and far-red light in photoperiodic responses? BPSC TRE 4 General Science practice set 3 217. Which structure prevents food from entering the trachea during swallowing? BPSC TRE 4 General Science practice set 3 218. Which of the following is an example of innate immunity? BPSC TRE 4 General Science practice set 3 219. Five identical resistors, each of resistance 10 ohm, are connected in series. Their equivalent resistance is BPSC TRE 4 General Science practice set 1 220. Two resistors of 6 ohm and 3 ohm are connected in parallel across a 12 V battery. The total current drawn from the battery is BPSC TRE 4 General Science practice set 1 221. A lens has a power of -2 D. Which type of lens is it and what is its focal length? BPSC TRE 4 General Science practice set 1 222. The far point of a normal human eye is approximately BPSC TRE 4 General Science practice set 1 223. Which structure connects the uterus with the vagina? BPSC TRE 4 General Science practice set 1 224. After fertilization in a flowering plant, the ovary generally develops into a BPSC TRE 4 General Science practice set 1 225. Which method of asexual reproduction is commonly seen in Hydra? BPSC TRE 4 General Science practice set 1 226. Which type of medicine is commonly applied to the skin to prevent infection in minor cuts and wounds? BPSC TRE 4 General Science practice set 1 227. Which of the following is an example of a runner, a modified stem? BPSC TRE 4 General Science practice set 2 228. When a convex lens is placed in a medium with a refractive index closer to that of the lens than air, its focal length generally BPSC TRE 4 General Science practice set 2 229. Why does the sky appear comparatively dark to an astronaut in outer space? BPSC TRE 4 General Science practice set 2 230. If the frequency of a light wave is 5 × 10^14 Hz and its speed in a medium is 2 × 10^8 m/s, its wavelength is BPSC TRE 4 General Science practice set 2 231. The speed of an electron in the third Bohr orbit of hydrogen is approximately BPSC TRE 4 General Science practice set 2 232. Why do our eyes produce tears while cutting onions? BPSC TRE 4 General Science practice set 4 233. A blackbody emits radiation at rate E at temperature T. At what temperature will its radiation rate become 256E? BPSC TRE 4 General Science practice set 2 234. Which acid is represented by the formula CH3COOH? BPSC TRE 4 General Science practice set 2 235. A source has luminous intensity 20 candela. The luminous flux emitted into a solid angle of π steradian is BPSC TRE 4 General Science practice set 3 236. If the velocity of an ideal fluid at the same height changes from v to 2v, the change in its kinetic-pressure term 1/2ρv² is BPSC TRE 4 General Science practice set 3 237. The oxidation state of lead in PbO is BPSC TRE 4 General Science practice set 3 238. The oxidation state of lead in PbO is BPSC TRE 4 General Science practice set 3 239. Which of the following has the larger atomic radius? BPSC TRE 4 General Science practice set 3 240. For most short-day plants, flowering is promoted primarily by BPSC TRE 4 General Science practice set 3 241. Which pair is correctly matched? BPSC TRE 4 General Science practice set 3 242. Which sequence correctly describes normal inspiration? BPSC TRE 4 General Science practice set 3 243. Which cells can directly kill virus-infected or abnormal cells as part of cell-mediated immunity? BPSC TRE 4 General Science practice set 3 244. Five identical resistors, each of resistance 10 ohm, are connected in parallel. Their equivalent resistance is BPSC TRE 4 General Science practice set 1 245. A 1000 W electric heater is operated for 2 hours. The electrical energy consumed is BPSC TRE 4 General Science practice set 1 246. Which lens is used to correct myopia (short-sightedness)? BPSC TRE 4 General Science practice set 1 247. The blind spot in the human eye is the point where BPSC TRE 4 General Science practice set 1 248. Which of the following produces sperm in the human male reproductive system? BPSC TRE 4 General Science practice set 1 249. Which part of a flower mainly attracts pollinators such as insects because of its colour and appearance? BPSC TRE 4 General Science practice set 1 250. Which method of asexual reproduction occurs in Leishmania? BPSC TRE 4 General Science practice set 1 251. Which of the following is NOT a primary function of an antacid? BPSC TRE 4 General Science practice set 1 252. Which of the following pairs is correctly matched? BPSC TRE 4 General Science practice set 2 253. Which statement about a concave lens in air is correct? BPSC TRE 4 General Science practice set 2 254. Which phenomenon is primarily responsible for the apparent visibility of a light beam in a dusty room? BPSC TRE 4 General Science practice set 2 255. When monochromatic light passes from one transparent medium to another, which pair of quantities generally changes? BPSC TRE 4 General Science practice set 2 256. If the electron speed in the first Bohr orbit of hydrogen is approximately 2.19 × 10^6 m/s, its speed in the second orbit is approximately BPSC TRE 4 General Science practice set 2 257. The tear-producing glands in humans are called BPSC TRE 4 General Science practice set 4 258. A blackbody emits radiant energy at rate E at temperature T. If its temperature is reduced to T/4, the new radiant energy rate will be BPSC TRE 4 General Science practice set 2 259. Which of the following is the formula of oxalic acid? BPSC TRE 4 General Science practice set 2 260. A surface is illuminated normally by a 12 candela point source placed 3 m away. The illuminance on the surface is BPSC TRE 4 General Science practice set 3 261. In a horizontal pipe, water has pressure 2.0 × 10^5 Pa and speed 2 m/s at one point. If its speed at another point is 6 m/s, taking water density as 1000 kg/m³, the pressure at the second point is BPSC TRE 4 General Science practice set 3 262. The oxidation states of the two lead atoms in Pb3O4 can be represented as BPSC TRE 4 General Science practice set 3 263. The oxidation states of the two lead atoms in Pb3O4 can be represented as BPSC TRE 4 General Science practice set 3 264. Which statement about atomic radius is correct? BPSC TRE 4 General Science practice set 3 265. Which element is particularly associated with the characteristic smell of many sulfur-containing onion compounds? BPSC TRE 4 General Science practice set 4 266. Which chemical compound is commonly known as CS gas and is used as a tear agent? BPSC TRE 4 General Science practice set 4 267. Tear gas primarily affects which parts of the human body? BPSC TRE 4 General Science practice set 4 268. The term lachrymatory refers to a substance that BPSC TRE 4 General Science practice set 4 269. Which chemical is commonly known as CS gas? BPSC TRE 4 General Science practice set 4 270. What causes stomata to open and close? BPSC TRE 4 General Science practice set 4 271. Which cells surround the stomatal pore? BPSC TRE 4 General Science practice set 4 272. The main function of stomata is BPSC TRE 4 General Science practice set 4 273. Which hormone is strongly associated with stomatal closure during water stress? BPSC TRE 4 General Science practice set 4 274. What is another name for quicksilver? BPSC TRE 4 General Science practice set 4 275. What is the chemical symbol of mercury? BPSC TRE 4 General Science practice set 4 276. What is the atomic number of mercury? BPSC TRE 4 General Science practice set 4 277. Which metal is liquid at ordinary room temperature? BPSC TRE 4 General Science practice set 4 278. Which of the following organisms is prokaryotic? BPSC TRE 4 General Science practice set 4 279. Which group contains only prokaryotic organisms? BPSC TRE 4 General Science practice set 4 280. Which structure is absent in a typical prokaryotic cell? BPSC TRE 4 General Science practice set 4 281. Which of the following is a characteristic of prokaryotic cells? BPSC TRE 4 General Science practice set 4 282. Which of the following is a unicellular eukaryotic organism? BPSC TRE 4 General Science practice set 4 283. Which of the following is a unicellular eukaryote? BPSC TRE 4 General Science practice set 4 284. Which unicellular organism moves using pseudopodia? BPSC TRE 4 General Science practice set 4 285. Which unicellular eukaryote is commonly used in bread and alcohol fermentation? BPSC TRE 4 General Science practice set 4 286. Who is credited with the first observation of bacteria using a microscope? BPSC TRE 4 General Science practice set 4 287. Who first used the term cell after observing cork? BPSC TRE 4 General Science practice set 4 288. Who is known as the father of microbiology? BPSC TRE 4 General Science practice set 4 289. Who proposed the cell theory along with Matthias Schleiden? BPSC TRE 4 General Science practice set 4 290. Which metal alloy is commonly used to manufacture heating elements of electric appliances? BPSC TRE 4 General Science practice set 4 291. Why is nichrome used in electric heating devices? BPSC TRE 4 General Science practice set 4 292. Which law explains the heating effect of electric current? BPSC TRE 4 General Science practice set 4 293. Which property is desirable for a material used as an electric heating element? BPSC TRE 4 General Science practice set 4 294. Angstrom is a unit of BPSC TRE 4 General Science practice set 4 295. One angstrom is equal to BPSC TRE 4 General Science practice set 4 296. Which scientist is associated with the angstrom unit? BPSC TRE 4 General Science practice set 4 297. Which of the following is the smallest unit of length among the given options? BPSC TRE 4 General Science practice set 4