BPSC TRE 4 General Science practice set 4 23rd September 2026 Share On Que: (1). Which of the following is an example of a chemical reaction? Rusting of iron C. Boiling of water B. Melting of ice A. More than one of the above D. None of the above E. Check Answer Open question page Que: (2). Which of the following is a chemical change? Cutting paper A. Burning of paper B. Melting wax C. More than one of the above D. None of the above E. Check Answer Open question page Que: (3). Which gas is released when an acid reacts with a metal carbonate? Carbon dioxide C. Oxygen A. Hydrogen B. More than one of the above D. None of the above E. Check Answer Open question page Que: (4). Which type of reaction occurs when two or more substances combine to form a single product? Displacement reaction C. Combination reaction B. Decomposition reaction A. More than one of the above D. None of the above E. Check Answer Open question page Que: (5). What is the audible frequency range of the human ear? 200 Hz to 2,000 Hz C. 2 Hz to 200 Hz A. 20 Hz to 20,000 Hz B. More than one of the above D. None of the above E. Check Answer Open question page Que: (6). Sound having a frequency greater than 20,000 Hz is called Infrasonic sound A. Ultrasonic sound C. Audible sound B. More than one of the above D. None of the above E. Check Answer Open question page Que: (7). Sound having a frequency below 20 Hz is known as Supersonic sound C. Ultrasonic sound A. Infrasonic sound B. More than one of the above D. None of the above E. Check Answer Open question page Que: (8). Which characteristic of sound determines its pitch? Frequency B. Amplitude A. Speed C. More than one of the above D. None of the above E. Check Answer Open question page Que: (9). Which chemical compound in onion causes tears in the eyes? Formic acid A. Syn-propanethial-S-oxide B. Acetic acid C. More than one of the above D. None of the above E. Check Answer Open question page Que: (10). Why do our eyes produce tears while cutting onions? Onion increases blood pressure A. Onion produces oxygen C. An irritating volatile compound reaches the eyes B. More than one of the above D. None of the above E. Check Answer Open question page Que: (11). The tear-producing glands in humans are called Salivary glands A. Sweat glands C. Lacrimal glands B. More than one of the above D. None of the above E. Check Answer Open question page Que: (12). Which element is particularly associated with the characteristic smell of many sulfur-containing onion compounds? Sulfur A. Calcium B. Iron C. More than one of the above D. None of the above E. Check Answer Open question page Que: (13). Which chemical compound is commonly known as CS gas and is used as a tear agent? Methanol C. o-Chlorobenzalmalononitrile B. Chloroform A. More than one of the above D. None of the above E. Check Answer Open question page Que: (14). Tear gas primarily affects which parts of the human body? Eyes and respiratory tract A. Bones only B. Hair only C. More than one of the above D. None of the above E. Check Answer Open question page Que: (15). The term lachrymatory refers to a substance that Causes digestion C. Causes tears B. Causes sweating A. More than one of the above D. None of the above E. Check Answer Open question page Que: (16). Which chemical is commonly known as CS gas? Capsaicin C. 2-Chlorobenzylidene malononitrile A. Chloroacetophenone B. More than one of the above D. None of the above E. Check Answer Open question page Que: (17). What causes stomata to open and close? Movement of bones B. Contraction of muscles C. Change in turgor pressure of guard cells A. More than one of the above D. None of the above E. Check Answer Open question page Que: (18). Which cells surround the stomatal pore? Guard cells A. Nerve cells C. Red blood cells B. More than one of the above D. None of the above E. Check Answer Open question page Que: (19). The main function of stomata is Transport of blood B. Digestion of food C. Gas exchange and regulation of transpiration A. More than one of the above D. None of the above E. Check Answer Open question page Que: (20). Which hormone is strongly associated with stomatal closure during water stress? Gibberellin C. Auxin A. Abscisic acid B. More than one of the above D. None of the above E. Check Answer Open question page Que: (21). What is another name for quicksilver? Mercury A. Copper C. Iron B. More than one of the above D. None of the above E. Check Answer Open question page Que: (22). What is the chemical symbol of mercury? Me A. Mr C. Hg B. More than one of the above D. None of the above E. Check Answer Open question page Que: (23). What is the atomic number of mercury? 80 C. 78 A. 79 B. More than one of the above D. None of the above E. Check Answer Open question page Que: (24). Which metal is liquid at ordinary room temperature? Aluminium C. Iron A. Mercury B. More than one of the above D. None of the above E. Check Answer Open question page Que: (25). Which of the following organisms is prokaryotic? Yeast C. Amoeba B. Bacterium A. More than one of the above D. None of the above E. Check Answer Open question page Que: (26). Which group contains only prokaryotic organisms? Plants and fungi B. Bacteria and Archaea A. Animals and protozoa C. More than one of the above D. None of the above E. Check Answer Open question page Que: (27). Which structure is absent in a typical prokaryotic cell? Cell membrane B. Ribosome A. Membrane-bound nucleus C. More than one of the above D. None of the above E. Check Answer Open question page Que: (28). Which of the following is a characteristic of prokaryotic cells? Presence of mitochondria B. Presence of chloroplasts C. Absence of a true nucleus A. More than one of the above D. None of the above E. Check Answer Open question page Que: (29). Which of the following is a unicellular eukaryotic organism? Amoeba A. Mango plant C. Human B. More than one of the above D. None of the above E. Check Answer Open question page Que: (30). Which of the following is a unicellular eukaryote? Virus C. Paramecium A. Bacterium B. More than one of the above D. None of the above E. Check Answer Open question page Que: (31). Which unicellular organism moves using pseudopodia? Paramecium B. Bacteria C. Amoeba A. More than one of the above D. None of the above E. Check Answer Open question page Que: (32). Which unicellular eukaryote is commonly used in bread and alcohol fermentation? Yeast A. Paramecium C. Amoeba B. More than one of the above D. None of the above E. Check Answer Open question page Que: (33). Who is credited with the first observation of bacteria using a microscope? Charles Darwin C. Robert Hooke A. Antonie van Leeuwenhoek B. More than one of the above D. None of the above E. Check Answer Open question page Que: (34). Who first used the term cell after observing cork? Leeuwenhoek B. Robert Hooke A. Louis Pasteur C. More than one of the above D. None of the above E. Check Answer Open question page Que: (35). Who is known as the father of microbiology? Antonie van Leeuwenhoek A. Gregor Mendel C. Isaac Newton B. More than one of the above D. None of the above E. Check Answer Open question page Que: (36). Who proposed the cell theory along with Matthias Schleiden? Theodor Schwann A. Robert Hooke B. Louis Pasteur C. More than one of the above D. None of the above E. Check Answer Open question page Que: (37). Which metal alloy is commonly used to manufacture heating elements of electric appliances? Silver C. Copper B. Nichrome A. More than one of the above D. None of the above E. Check Answer Open question page Que: (38). Why is nichrome used in electric heating devices? It has relatively high resistance and high melting point A. It is a perfect insulator B. It has very low resistance C. More than one of the above D. None of the above E. Check Answer Open question page Que: (39). Which law explains the heating effect of electric current? Joule’s law A. Archimedes principle B. Pascal’s law C. More than one of the above D. None of the above E. Check Answer Open question page Que: (40). Which property is desirable for a material used as an electric heating element? Very low resistance C. Very low melting point B. High electrical resistance A. More than one of the above D. None of the above E. Check Answer Open question page Que: (41). Angstrom is a unit of Length A. Time C. Mass B. More than one of the above D. None of the above E. Check Answer Open question page Que: (42). One angstrom is equal to 10⁻¹⁰ metre B. 10⁻¹² metre C. 10⁻⁸ metre A. More than one of the above D. None of the above E. Check Answer Open question page Que: (43). Which scientist is associated with the angstrom unit? Michael Faraday B. Anders Jonas Ångström A. James Watt C. More than one of the above D. None of the above E. Check Answer Open question page Que: (44). Which of the following is the smallest unit of length among the given options? Metre A. Angstrom C. Centimetre B. More than one of the above D. None of the above E. Check Answer Open question page
