BPSC TRE 4 General Science practice set 3 05th September 2026 Share On Que: (1). An isotropic source of 2 candela produces light flux equal to Asked in BPSC TRE 1.0 2π lumen A. 8π lumen C. 4π lumen B. 16π lumen D. None of the above E. Check Answer Open question page Que: (2). An isotropic source has luminous intensity of 5 candela. Its total luminous flux is 5π lumen A. 20π lumen C. 10π lumen B. 25π lumen D. None of the above E. Check Answer Open question page Que: (3). One candela is equivalent to luminous flux of how much per steradian? 4π lumen per steradian C. 1 lumen per steradian A. 1 steradian per lumen B. 2π lumen per steradian D. None of the above E. Check Answer Open question page Que: (4). The total solid angle around a point is 2π steradian A. 4π steradian C. 3π steradian B. 6π steradian D. None of the above E. Check Answer Open question page Que: (5). A point source of luminous intensity 10 candela illuminates a surface normally at a distance of 2 m. The illuminance is 5 lux C. 2.5 lux B. 1.5 lux A. 10 lux D. 20 lux E. Check Answer Open question page Que: (6). If the distance from an isotropic point source is doubled, the illuminance becomes Twice the original C. One-half of the original A. One-fourth of the original B. Four times the original D. Unchanged E. Check Answer Open question page Que: (7). The SI unit of luminous flux is Lux B. Lumen C. Candela A. Steradian D. Watt E. Check Answer Open question page Que: (8). The SI unit of illuminance is Lux C. Candela B. Lumen A. Steradian D. Watt E. Check Answer Open question page Que: (9). A 4 candela isotropic source produces total luminous flux equal to 8π lumen B. 4π lumen A. 12π lumen C. 16π lumen D. 20π lumen E. Check Answer Open question page Que: (10). A source has luminous intensity 20 candela. The luminous flux emitted into a solid angle of π steradian is 20π lumen C. 10π lumen B. 5π lumen A. 40π lumen D. 80π lumen E. Check Answer Open question page Que: (11). A surface is illuminated normally by a 12 candela point source placed 3 m away. The illuminance on the surface is 4/3 lux B. 1 lux A. 3 lux C. 4 lux D. 12 lux E. Check Answer Open question page Que: (12). The spray bottles used as window or household cleaner or perfume sprayer work on Asked in BPSC TRE 1.0 Bernoulli's principle B. Pascal's law C. Capillary action A. More than one of the above D. None of the above E. Check Answer Open question page Que: (13). According to Bernoulli's principle, when the speed of a flowing fluid increases, its pressure generally Decreases B. Increases A. Remains exactly constant C. Becomes zero D. Becomes infinite E. Check Answer Open question page Que: (14). The working of an atomizer or perfume sprayer is primarily based on Pascal's law A. Bernoulli's principle B. Archimedes' principle C. Newton's law of cooling D. Hooke's law E. Check Answer Open question page Que: (15). In a horizontal pipe, water flows through a narrow section. Compared with the wider section, the speed of water in the narrow section is The same in all cases C. Lower A. Higher B. Zero D. Unpredictable from the given conditions E. Check Answer Open question page Que: (16). The equation P + 1/2ρv² + ρgh = constant represents Archimedes' principle C. Bernoulli's equation B. Pascal's law A. Newton's second law D. Hooke's law E. Check Answer Open question page Que: (17). The lifting of an airplane wing is commonly explained using Pascal's law alone B. Bernoulli's principle and fluid dynamics A. Archimedes' principle alone C. Boyle's law alone D. Ohm's law E. Check Answer Open question page Que: (18). 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 1.5 m/s A. 3 m/s B. 6 m/s C. 12 m/s D. 24 m/s E. Check Answer Open question page Que: (19). Pascal's law is the basic principle behind Venturimeters C. Hydraulic brakes and hydraulic lifts A. Perfume sprayers B. Atomizers D. Pitot tubes E. Check Answer Open question page Que: (20). The instrument used to measure pressure difference in a flowing fluid using the pressure change in a constricted passage is Barometer A. Venturimeter B. Hydrometer C. Calorimeter D. Galvanometer E. Check Answer Open question page Que: (21). 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 It becomes half A. It becomes four times C. It becomes twice B. It becomes eight times D. It remains unchanged E. Check Answer Open question page Que: (22). 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 2.16 × 10^5 Pa C. 1.84 × 10^5 Pa A. 1.76 × 10^5 Pa B. 2.08 × 10^5 Pa D. 1.20 × 10^5 Pa E. Check Answer Open question page Que: (23). The trade name of basic lead carbonate is Red lead B. White lead A. Litharge C. More than one of the above D. None of the above E. Check Answer Open question page Que: (24). The chemical formula of white lead is PbO A. Pb3O4 B. 2PbCO3·Pb(OH)2 C. PbCO3 D. Pb(OH)2 E. Check Answer Open question page Que: (25). The trade name of lead tetroxide (Pb3O4) is Red lead B. White lead A. Litharge C. Galena D. Cerussite E. Check Answer Open question page Que: (26). The compound PbO is commonly known by the trade name White lead A. Red lead B. Litharge C. Minium D. Cerussite E. Check Answer Open question page Que: (27). The mineral name of lead(II) sulfide, PbS, is Cerussite C. Anglesite B. Galena A. Minium D. Litharge E. Check Answer Open question page Que: (28). The mineral name of lead(II) carbonate, PbCO3, is Cerussite C. Anglesite B. Galena A. Litharge D. Minium E. Check Answer Open question page Que: (29). The mineral name of lead(II) sulfate, PbSO4, is Anglesite C. Cerussite A. Galena B. Minium D. Litharge E. Check Answer Open question page Que: (30). Which compound is commonly called minium? Pb3O4 B. PbO A. PbS C. PbCO3 D. PbSO4 E. Check Answer Open question page Que: (31). Which of the following is a traditional white pigment containing basic lead carbonate? Red lead B. Litharge C. White lead A. Minium D. Galena E. Check Answer Open question page Que: (32). The oxidation state of lead in PbO is +2 B. +3 C. +1 A. +4 D. Check Answer Open question page Que: (33). The oxidation states of the two lead atoms in Pb3O4 can be represented as All three are +2 A. Two are +2 and one is +4 C. All three are +4 B. One is +1 and two are +3 D. Two are +1 and one is +4 E. Check Answer Open question page Que: (34). The trade name of basic lead carbonate is Asked in BPSC TRE 1.0 Litharge C. Red lead B. White lead A. More than one of the above D. None of the above E. Check Answer Open question page Que: (35). The chemical formula of white lead is Pb3O4 B. 2PbCO3·Pb(OH)2 C. PbO A. PbCO3 D. Pb(OH)2 E. Check Answer Open question page Que: (36). The trade name of lead tetroxide (Pb3O4) is Red lead B. Litharge C. White lead A. Galena D. Cerussite E. Check Answer Open question page Que: (37). The compound PbO is commonly known by the trade name White lead A. Red lead B. Litharge C. Minium D. Cerussite E. Check Answer Open question page Que: (38). The mineral name of lead(II) sulfide, PbS, is Anglesite B. Galena A. Cerussite C. Minium D. Litharge E. Check Answer Open question page Que: (39). The mineral name of lead(II) carbonate, PbCO3, is Cerussite C. Anglesite B. Galena A. Litharge D. Minium E. Check Answer Open question page Que: (40). The mineral name of lead(II) sulfate, PbSO4, is Galena B. Anglesite C. Cerussite A. Minium D. Litharge E. Check Answer Open question page Que: (41). Which compound is commonly called minium? Pb3O4 B. PbS C. PbO A. PbCO3 D. PbSO4 E. Check Answer Open question page Que: (42). Which of the following is a traditional white pigment containing basic lead carbonate? Litharge C. Red lead B. White lead A. Minium D. Galena E. Check Answer Open question page Que: (43). The oxidation state of lead in PbO is +3 C. +2 B. +1 A. +4 D. Check Answer Open question page Que: (44). The oxidation states of the two lead atoms in Pb3O4 can be represented as Two are +2 and one is +4 C. All three are +4 B. All three are +2 A. One is +1 and two are +3 D. Two are +1 and one is +4 E. Check Answer Open question page Que: (45). Which of the following elements has the largest atomic radius? Asked in BPSC TRE 1.0 Boron C. Lithium A. Beryllium B. More than one of the above D. None of the above E. Check Answer Open question page Que: (46). Which of the following elements has the smallest atomic radius among Li, Be and B? Boron C. Beryllium B. Lithium A. More than one of the above D. None of the above E. Check Answer Open question page Que: (47). The atomic radius generally decreases from left to right across a period because Number of neutrons becomes zero C. Number of shells decreases A. Effective nuclear charge increases B. Atomic mass always decreases D. None of the above E. Check Answer Open question page Que: (48). The atomic radius generally increases down a group because The number of valence electrons always decreases C. The nuclear charge becomes zero B. The number of electron shells increases A. The atomic mass decreases D. None of the above E. Check Answer Open question page Que: (49). Which of the following has the largest atomic radius? Lithium A. Sodium B. Potassium C. More than one of the above D. None of the above E. Check Answer Open question page Que: (50). Which of the following has the smallest atomic radius? Aluminium C. Sodium A. Magnesium B. More than one of the above D. None of the above E. Check Answer Open question page Que: (51). Which element has the largest atomic radius among Na, Mg, Si and Cl? Magnesium B. Sodium A. Silicon C. Chlorine D. None of the above E. Check Answer Open question page Que: (52). Which of the following correctly represents the atomic radius order from largest to smallest? Be > Li > B C. B > Be > Li B. Li > Be > B A. Li > B > Be D. None of the above E. Check Answer Open question page Que: (53). Which pair represents elements belonging to the same group and shows increasing atomic radius from top to bottom? Li < Be < B C. Li < Na < K A. K < Na < Li B. B < C < N D. None of the above E. Check Answer Open question page Que: (54). Which of the following has the larger atomic radius? Chlorine B. Both have exactly the same atomic radius C. Sodium A. More than one of the above D. None of the above E. Check Answer Open question page Que: (55). Which statement about atomic radius is correct? It generally increases across a period from left to right A. It generally decreases down a group B. It generally decreases across a period and increases down a group C. It remains constant throughout the periodic table D. None of the above E. Check Answer Open question page Que: (56). The phenomenon of photoperiodism in plants was discovered by Asked in BPSC TRE 1.0 Garner and Allard A. Steward and Salisbury B. Thimann and Skoog C. More than one of the above D. None of the above E. Check Answer Open question page Que: (57). Garner and Allard studied photoperiodism particularly through experiments on which tobacco variety? Virginia Gold B. Indian Tobacco C. Maryland Mammoth A. Kentucky Burley D. Virginia Bright E. Check Answer Open question page Que: (58). Photoperiodism refers to the response of plants mainly to Intensity of soil nutrients B. Amount of water absorbed C. Relative duration of light and darkness A. Concentration of carbon dioxide only D. Soil temperature only E. Check Answer Open question page Que: (59). A plant that flowers when the day length is shorter than a critical value is generally called a Long-day plant A. Day-neutral plant C. Short-day plant B. Aquatic plant D. Desert plant E. Check Answer Open question page Que: (60). Which of the following is a commonly cited short-day plant? Spinach B. Chrysanthemum A. Wheat C. Radish D. Pea E. Check Answer Open question page Que: (61). Which of the following is a commonly cited long-day plant? Spinach A. Chrysanthemum B. Poinsettia C. Cocklebur D. Strawberry E. Check Answer Open question page Que: (62). Which of the following is generally classified as a day-neutral plant? Spinach C. Tomato A. Chrysanthemum B. Cocklebur D. Radish E. Check Answer Open question page Que: (63). In photoperiodism, the organ that primarily perceives the photoperiodic signal is the Root A. Leaf B. Flower petal C. Fruit D. Seed coat E. Check Answer Open question page Que: (64). Which pigment plays an important role in sensing red and far-red light in photoperiodic responses? Phytochrome C. Carotene B. Chlorophyll b A. Anthocyanin D. Xanthophyll E. Check Answer Open question page Que: (65). For most short-day plants, flowering is promoted primarily by Continuous light C. A very short night B. A long uninterrupted night A. Complete absence of darkness D. Only high daytime temperature E. Check Answer Open question page Que: (66). Which pair is correctly matched? Garner and Allard — Photoperiodism A. Darwin and Wallace — Photoperiodism C. Garner and Allard — Transpiration B. Thimann and Skoog — Discovery of photoperiodism D. Sachs and Knop — Discovery of photoperiodism E. Check Answer Open question page Que: (67). During normal respiration in a mammal, the diaphragm is Asked in BPSC TRE 1.0 Flattened B. Arched A. Permanently relaxed C. More than one of the above D. None of the above E. Check Answer Open question page Que: (68). During normal inspiration, the diaphragm Contracts and flattens A. Stops moving C. Relaxes and arches B. Moves upward and contracts D. Becomes permanently rigid E. Check Answer Open question page Que: (69). During normal expiration, the diaphragm generally Flattens further C. Relaxes and becomes dome-shaped B. Contracts strongly A. Moves downward while contracting D. Becomes permanently contracted E. Check Answer Open question page Que: (70). The main muscle responsible for quiet inspiration is the Diaphragm A. Triceps C. Biceps B. Gastrocnemius D. Deltoid E. Check Answer Open question page Que: (71). Contraction of the diaphragm during inspiration causes the volume of the thoracic cavity to Increase B. Decrease A. Remain unchanged C. Become zero D. Change unpredictably E. Check Answer Open question page Que: (72). According to Boyle's law, if the volume of a gas-filled cavity increases at constant temperature, its pressure Remains unchanged C. Decreases B. Increases A. Becomes infinite D. Becomes zero in every case E. Check Answer Open question page Que: (73). Air enters the lungs during inspiration mainly because the pressure inside the lungs becomes Higher than atmospheric pressure A. Lower than atmospheric pressure B. Equal to zero C. Unrelated to atmospheric pressure D. Constantly higher than atmospheric pressure E. Check Answer Open question page Que: (74). The exchange of oxygen and carbon dioxide between alveolar air and blood occurs mainly by Osmosis C. Diffusion B. Active transport A. Filtration D. Endocytosis E. Check Answer Open question page Que: (75). The tiny air sacs in the lungs where most gaseous exchange occurs are called Tracheae B. Alveoli C. Bronchi A. Larynx D. Pleura E. Check Answer Open question page Que: (76). Which structure prevents food from entering the trachea during swallowing? Diaphragm B. Alveolus C. Epiglottis A. Bronchiole D. Pleura E. Check Answer Open question page Que: (77). Which sequence correctly describes normal inspiration? Diaphragm relaxes → thoracic volume increases → lung pressure increases → air enters B. Diaphragm contracts → thoracic volume decreases → lung pressure decreases → air enters C. Diaphragm contracts → thoracic volume increases → lung pressure decreases → air enters A. Diaphragm relaxes → thoracic volume decreases → lung pressure decreases → air enters D. Diaphragm stops moving → lung pressure decreases → air enters E. Check Answer Open question page Que: (78). The most important cell type associated with the immunity of the body is Asked in BPSC TRE 1.0 Platelets A. Lymphocytes B. RBCs C. More than one of the above D. None of the above E. Check Answer Open question page Que: (79). Which type of lymphocyte produces antibodies? B lymphocyte B. Natural killer cell C. T lymphocyte A. Neutrophil D. Monocyte E. Check Answer Open question page Que: (80). Which cells are primarily responsible for cell-mediated immunity? T lymphocytes B. B lymphocytes A. Platelets C. RBCs D. Eosinophils E. Check Answer Open question page Que: (81). Which blood cells are primarily responsible for carrying oxygen? Platelets B. Lymphocytes A. Red blood cells C. Basophils D. Monocytes E. Check Answer Open question page Que: (82). Which blood component is mainly involved in blood clotting? Red blood cells C. Platelets B. Lymphocytes A. Plasma cells D. Neutrophils E. Check Answer Open question page Que: (83). Which immunoglobulin is generally the most abundant antibody in human blood serum? IgA A. IgE B. IgG C. IgM D. IgD E. Check Answer Open question page Que: (84). Which immunoglobulin is mainly associated with allergic reactions? IgM C. IgA B. IgG A. IgE D. IgD E. Check Answer Open question page Que: (85). Which type of white blood cell can differentiate into antibody-secreting plasma cells? B lymphocyte A. Neutrophil C. T lymphocyte B. Eosinophil D. Basophil E. Check Answer Open question page Que: (86). Which organ is considered a primary lymphoid organ where T lymphocytes mature? Lymph node C. Spleen A. Thymus B. Tonsil D. Appendix E. Check Answer Open question page Que: (87). Which of the following is an example of innate immunity? Antibody production after vaccination A. Formation of immunological memory C. Skin acting as a physical barrier B. Antibody response to a specific antigen D. Clonal expansion of antigen-specific B cells E. Check Answer Open question page Que: (88). Which cells can directly kill virus-infected or abnormal cells as part of cell-mediated immunity? Platelets C. Cytotoxic T lymphocytes B. Red blood cells A. Plasma cells D. Mast cells E. Check Answer Open question page
