SSC CGL Physics Questions and Answers – Page 6

In concise terms, What is the SI unit of temperature? — the scientifically appropriate response is Kelvin. Option-wise review: Kelvin is correct under the condition given in the stem. Celsius is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Fahrenheit is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Rankine 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, Kelvin, is factually and logically consistent with the question. Temperature is measured in Kelvin (K) in the SI system.

In concise terms, What does the term 'resonance' refer to in physics? — the scientifically appropriate response is Natural frequency matching driven frequency. Option-wise review: Natural frequency matching driven frequency is correct under the condition given in the stem. Maximum damping is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Minimum energy transfer is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Wave reflection is incorrect because it fails the governing relation or characteristic relevant to this case. Therefore, option B, Natural frequency matching driven frequency, is factually and logically consistent with the question. Resonance occurs when the driving frequency matches the natural frequency of an oscillating system.

In concise terms, What type of electromagnetic radiation has the shortest wavelength? — the scientifically appropriate response is Gamma rays. Option-wise review: Gamma rays is correct under the condition given in the stem. Radio waves is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Infrared is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Ultraviolet is incorrect because it fails the governing relation or characteristic relevant to this case. Therefore, option D, Gamma rays, is factually and logically consistent with the question. Gamma rays have the shortest wavelength and highest energy in the electromagnetic spectrum.

definition, law, relation, or working principle involved. In concise terms, Which law describes the relationship between pressure and temperature of gas at constant volume? — the scientifically appropriate response is Gay-Lussac's Law. Option-wise review: Gay-Lussac's Law is correct under the condition given in the stem. Boyle's Law is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Charles' Law is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Avogadro's Law 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, Gay-Lussac's Law, is factually and logically consistent with the question. Gay-Lussac's Law states P/T = constant at constant volume meaning P ∝ T.

In concise terms, What is the phenomenon when light falls on a metal surface and electrons are emitted? — the scientifically appropriate response is Photoelectric effect. Option-wise review: Photoelectric effect is correct under the condition given in the stem. Thermionic emission is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Compton effect is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Zeeman effect 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, Photoelectric effect, is factually and logically consistent with the question. The photoelectric effect occurs when light of sufficient frequency falls on a metal releasing electrons.

In concise terms, In nuclear fission the nucleus splits into — the scientifically appropriate response is Two smaller nuclei. Option-wise review: Two smaller nuclei is correct under the condition given in the stem. Protons and neutrons is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Electrons and positrons is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Photons 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, Two smaller nuclei, is factually and logically consistent with the question. In nuclear fission a heavy nucleus splits into two smaller nuclei releasing enormous energy.

In concise terms, What is the unit of luminous intensity? — the scientifically appropriate response is Candela. Option-wise review: Candela is correct under the condition given in the stem. Lux is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Lumen 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 C, Candela, is factually and logically consistent with the question. Luminous intensity is measured in Candela (cd) which is an SI base unit.

In concise terms, Which mirror produces a virtual erect and magnified image? — the scientifically appropriate response is Concave mirror. Option-wise review: Concave mirror is correct under the condition given in the stem. Convex 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. All mirrors 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, Concave mirror, is factually and logically consistent with the question. A concave mirror produces a virtual erect and magnified image when object is placed between F and P.

In concise terms, What is the refractive index of a medium? — the scientifically appropriate response is Speed of light in vacuum/Speed of light in medium. Option-wise review: Speed of light in vacuum/Speed of light in medium is correct under the condition given in the stem. Speed of light in medium/Speed of light in vacuum is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Wavelength in medium/Wavelength in vacuum is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Frequency in vacuum/Frequency in medium is incorrect because it fails the governing relation or characteristic relevant to this case. Therefore, option B, Speed of light in vacuum/Speed of light in medium, is factually and logically consistent with the question. Refractive index n = c/v where c is speed in vacuum and v is speed in medium.

accepted physical definition, law, relation, or working principle involved. In concise terms, What is the formula for Coulomb's Law? — the scientifically appropriate response is F = kq1q2/r². Option-wise review: F = kq1q2/r² is correct under the condition given in the stem. F = q1q2/r is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. F = kq1q2r 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 B, F = kq1q2/r², is factually and logically consistent with the question. Coulomb's Law: F = kq1q2/r² where k = 9×10⁹ Nm²/C².