SSC CGL Physics Questions and Answers – Page 3

tion, law, relation, or working principle involved. — the scientifically appropriate response is Finding direction of induced current. Option-wise review: Finding direction of induced current is correct under the condition given in the stem. Finding magnitude of EMF is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Calculating resistance is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Measuring capacitance 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. 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, Finding direction of induced current, is factually and logically consistent with the question. Lenz's law states that the direction of induced current is such as to oppose the change causing it.

In concise terms, What is the term for the maximum displacement in a wave? — the scientifically appropriate response is Amplitude. Option-wise review: Amplitude is correct under the condition given in the stem. Wavelength is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Frequency is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Time period 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, Amplitude, is factually and logically consistent with the question. Amplitude is the maximum displacement of a particle from its mean (equilibrium) position in a wave.

In concise terms, What is the image formed by a plane mirror? — the scientifically appropriate response is Virtual and erect. Option-wise review: Virtual and erect is correct under the condition given in the stem. Real and inverted is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Virtual and inverted is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Real and erect 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, Virtual and erect, is factually and logically consistent with the question. A plane mirror forms a virtual erect and laterally inverted image of the same size as the object.

In concise terms, What is the acceleration of a body in uniform circular motion directed towards? — the scientifically appropriate response is Towards the center. Option-wise review: Towards the center is correct under the condition given in the stem. Tangential direction is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Away from center is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Opposite to velocity 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, Towards the center, is factually and logically consistent with the question. In uniform circular motion the centripetal acceleration is always directed towards the center of the circle.

lation, or working principle involved. In concise terms, What is the Bernoulli's principle related to? — the scientifically appropriate response is Fluid flow and pressure. Option-wise review: Fluid flow and pressure is correct under the condition given in the stem. Magnetism is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Wave propagation is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Nuclear reactions 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, Fluid flow and pressure, is factually and logically consistent with the question. Bernoulli's principle states that in a fluid flow increase in velocity causes decrease in pressure.

In concise terms, What is the phenomenon by which certain materials emit light when exposed to radiation? — the scientifically appropriate response is Fluorescence. Option-wise review: Fluorescence 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. Diffraction is incorrect because it fails the governing relation or characteristic relevant to this case. Therefore, option C, Fluorescence, is factually and logically consistent with the question. Fluorescence is the emission of light by a substance that has absorbed radiation of a different wavelength.

— the scientifically appropriate response is Voltage/Potential difference. Option-wise review: Voltage/Potential difference is correct under the condition given in the stem. Current is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Resistance is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Power is incorrect because it fails the governing relation or characteristic relevant to this case. Therefore, option C, Voltage/Potential difference, is factually and logically consistent with the question. A voltmeter measures electric potential difference (voltage) between two points and is connected in parallel.

In concise terms, Which instrument is used to measure the humidity of air? — the scientifically appropriate response is Hygrometer. Option-wise review: Hygrometer is correct under the condition given in the stem. Barometer is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Thermometer is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Anemometer is incorrect because it fails the governing relation or characteristic relevant to this case. Therefore, option C, Hygrometer, is factually and logically consistent with the question. A hygrometer is used to measure the humidity (moisture content) of the atmosphere.

In concise terms, What is the wavelength range of visible light? — the scientifically appropriate response is 400-700 nm. Option-wise review: 400-700 nm is correct under the condition given in the stem. 100-400 nm is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. 700-1000 nm is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. 200-400 nm is incorrect because it fails the governing relation or characteristic relevant to this case. Therefore, option B, 400-700 nm, is factually and logically consistent with the question. Visible light has wavelengths between approximately 400 nm (violet) to 700 nm (red).

— the scientifically appropriate response is Becquerel. Option-wise review: Becquerel is correct under the condition given in the stem. Roentgen is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Curie is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Gray 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, Becquerel, is factually and logically consistent with the question. Radioactivity is measured in Becquerel (Bq) in SI system.