SSC CGL Physics Questions and Answers – Page 10

In concise terms, Which phenomenon is responsible for the blue colour of the sky? — the scientifically appropriate response is Scattering. Option-wise review: Scattering is correct under the condition given in the stem. Reflection is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Refraction is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Dispersion is incorrect because it fails the governing relation or characteristic relevant to this case. For examination purposes, do not choose an option only because it sounds familiar. Therefore, option C, Scattering, is factually and logically consistent with the question. The sky appears blue due to Rayleigh scattering of sunlight by atmospheric molecules.

— the scientifically appropriate response is Watt. Option-wise review: Watt is correct under the condition given in the stem. Joule is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Newton is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Pascal is incorrect because it fails the governing relation or characteristic relevant to this case. Identify the chapter, recall the exact definition or equation, check the unit or direction if applicable, and then eliminate choices that contradict it. Therefore, option D, Watt, is factually and logically consistent with the question. Power is measured in Watts (W).

In concise terms, Ohm's law states that V is equal to? According to Ohm's law V = IR where V is voltage I is current and R is resistance.

In concise terms, What is the SI unit of pressure? — the scientifically appropriate response is Pascal. Option-wise review: Pascal is correct under the condition given in the stem. Newton is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Joule is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Bar is incorrect because it fails the governing relation or characteristic relevant to this case. Identify the chapter, recall the exact definition or equation, check the unit or direction if applicable, and then eliminate choices that contradict it. Therefore, option C, Pascal, is factually and logically consistent with the question. Pressure is measured in Pascal (Pa).

In concise terms, Which mirror is used in vehicle rear-view mirrors? — the scientifically appropriate response is Convex mirror. Option-wise review: Convex mirror is correct under the condition given in the stem. Concave mirror is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Plane mirror is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Parabolic mirror is incorrect because it fails the governing relation or characteristic relevant to this case. Therefore, option C, Convex mirror, is factually and logically consistent with the question. Convex mirrors are used in rear-view mirrors as they give a wider field of view.

In concise terms, What is the formula for kinetic energy? KE = mgh is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. For examination purposes, do not choose an option only because it sounds familiar. Kinetic energy = ½mv² where m is mass and v is velocity.

In concise terms, What is the unit of electric current? — the scientifically appropriate response is Ampere. Option-wise review: Ampere is correct under the condition given in the stem. Volt is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Ohm is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Watt is incorrect because it fails the governing relation or characteristic relevant to this case. Identify the chapter, recall the exact definition or equation, check the unit or direction if applicable, and then eliminate choices that contradict it. Therefore, option B, Ampere, is factually and logically consistent with the question. Electric current is measured in Ampere (A).

In concise terms, Which law states that every action has an equal and opposite reaction? — the scientifically appropriate response is Newton's Third Law. Option-wise review: Newton's Third Law is correct under the condition given in the stem. Newton's First Law is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Newton's Second Law is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Law of Conservation is incorrect because it fails the governing relation or characteristic relevant to this case. Identify the chapter, recall the exact definition or equation, check the unit or direction if applicable, and then eliminate choices that contradict it. Therefore, option C, Newton's Third Law, is factually and logically consistent with the question. Newton's Third Law of Motion states that for every action there is an equal and opposite reaction.

In concise terms, What is the speed of light in vacuum? Speed of light in vacuum is approximately 3×10^8 m/s.

In concise terms, What is the SI unit of force? — the scientifically appropriate response is Newton. Option-wise review: Newton is correct under the condition given in the stem. Pascal is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Joule is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Watt is incorrect because it fails the governing relation or characteristic relevant to this case. Identify the chapter, recall the exact definition or equation, check the unit or direction if applicable, and then eliminate choices that contradict it. Therefore, option A, Newton, is factually and logically consistent with the question. Force is measured in Newtons (N) named after Isaac Newton.