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? Boiling of water B. Melting of ice A. Rusting of iron C. 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. Melting wax C. Burning of paper B. 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? Oxygen A. Hydrogen B. Carbon dioxide C. 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? Combination reaction B. Displacement reaction C. 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? 20 Hz to 20,000 Hz B. 200 Hz to 2,000 Hz C. 2 Hz to 200 Hz A. 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 Audible sound B. Ultrasonic sound C. Infrasonic sound A. 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. Infrasonic sound B. Ultrasonic sound A. 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? Speed C. Frequency B. Amplitude A. 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? Syn-propanethial-S-oxide B. Acetic acid C. Formic acid A. 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 Lacrimal glands B. Sweat glands C. Salivary glands A. 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? Calcium B. Sulfur A. 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? Bones only B. Eyes and respiratory tract A. 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 sweating A. Causes tears B. 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? 2-Chlorobenzylidene malononitrile A. Capsaicin C. 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. Gas exchange and regulation of transpiration A. Digestion of food C. 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. Iron B. Copper C. 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? Hg B. Me A. Mr C. 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? 79 B. 78 A. 80 C. 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? Iron A. Aluminium C. 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? Amoeba B. Yeast C. 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? Animals and protozoa C. Bacteria and Archaea A. Plants and fungi B. 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? Ribosome A. Cell membrane B. 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 chloroplasts C. Absence of a true nucleus A. Presence of mitochondria B. 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? Human B. Amoeba A. Mango plant C. 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. Amoeba A. Bacteria C. 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? Paramecium C. Yeast A. 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? Antonie van Leeuwenhoek B. Robert Hooke A. Charles Darwin C. 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? Louis Pasteur C. Leeuwenhoek B. Robert Hooke A. 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? Isaac Newton B. Antonie van Leeuwenhoek A. Gregor Mendel C. 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? Nichrome A. Copper B. Silver C. 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 is a perfect insulator B. It has relatively high resistance and high melting point A. 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. Pascal’s law C. Archimedes principle B. 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? High electrical resistance A. Very low resistance C. Very low melting point B. More than one of the above D. None of the above E. Check Answer Open question page Que: (41). Angstrom is a unit of Time C. Mass B. Length A. 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. 10⁻⁸ metre A. 10⁻¹² metre C. 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? Anders Jonas Ångström A. James Watt C. Michael Faraday B. 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? Centimetre B. Metre A. Angstrom C. More than one of the above D. None of the above E. Check Answer Open question page
