Q. Which of the following slow down the reaction rate? (69th BPSC Prelims 2023) (A) Catalytic promoter (B) Homogenous catalyst (C) Heterogeneous catalyst (D) None of the above Answer: C Homogeneous catalysis because a catalyst is a substance that boosts the rate of a reaction but does not change chemically during the process The reactants […]
27. Current density is? (A) a scalar quantity (B) a vector quantity (C) dimensionless (D) None of the above Answer: B Read more: Must Read Books for Competitive Exams Current density is a vector quantity having both a direction and a scalar magnitude. Current density is referred to as the total amount of current which is
Q. An AC current can be produced by? (A) Choke coil (B) Dynamo (C) Transformer (D) None of the above Answer: B An alternating current can be produced by a dynamo. Read more: Must Read Books for Competitive Exams
Q. What is the expanded form of the term ‘mRNA’ that has been widely discussed since the beginning of the pandemic? (69th BPSC Prelims 2023) (A) Messenger Ribonucleic Acid (B) Mutant Ribonucleic Acid (C) Modified Ribonucleic Acid (D) Mnemonic Ribonucleic Acid Answer: A Messenger RNA (abbreviated mRNA) is a type of single-stranded RNA involved in
Q. The theory that states “pieces of the Earth’s crust are in constant, slow motion driven by movement in the mantle is called? (A) The theory of continental drift (B) The theory of Pangaea (C) The theory of plate tectonics (D) The theory boundaries of plate Answer: C The geological theory that states that pieces
Q. The process that continually adds new crust is? (A) Subduction (B) Earthquake (C) Seafloor spreading (D) Convection Answer: C Seafloor spreading creates new crust. Subduction destroys old crust. Read more: Must Read Books for Competitive Exams
Q. How do vector vaccines work to provide immunity? (A) By introducing a weakened or inactivated virus into the body (B) By directly attacking and destroying pathogens in the body (C) By placing the virus in a modified version of a different virus (D) By entering directly into the cells and enabling them to create
Q. How do COVID vaccines stimulate an immune response? (A) By introducing live attenuated SARS-CoV-2 virus (B) By introducing a real SARS-CoV-2 virus (C) By introducing a harmless piece of SARS-CoV-2 virus (D) By introducing antibodies against SARS-CoV-2 virus Answer: A To trigger an immune response, many vaccines put a weakened or inactivated germ into
Q. The amount of solute present per unit volume or per unit mass of the solution/solvent is known as in Chemistry? (A) Composition of solute (B) Concentration of solvent (C) Concentration of solute (D) Concentration of solution Answer: D The amount of solute present per unit volume or unit mass of the solution/solvent is known
Q. A photoelectric cell is a device which? (A) Converts light energy into electric energy (B) Converts electric energy into light energy (C) Stores light energy (D) None of the above Answer: A Photoelectric cell is a device that converts light energy into electric energy. Read more: Must Read Books for Competitive Exams