SSC CGL Physics Questions and Answers

In concise terms, Which phenomenon is responsible for the formation of mirages? — the scientifically appropriate response is Total internal reflection in air. Option-wise review: Total internal reflection in air 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. Diffraction 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 B, Total internal reflection in air, is factually and logically consistent with the question. Mirages are formed due to total internal reflection of light in hot layers of air near the ground.

In concise terms, What is the formula for gravitational force between two masses? For examination purposes, do not choose an option only because it sounds familiar.

In concise terms, What is the effect of increasing temperature on the speed of sound in air? — the scientifically appropriate response is Increases. Option-wise review: Increases is correct under the condition given in the stem. Decreases is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Remains same is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. First increases then decreases 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, Increases, is factually and logically consistent with the question. Speed of sound in air increases with temperature as v ∝ √T.

law, relation, or working principle involved. In concise terms, What is the working principle of MRI (Magnetic Resonance Imaging)? — the scientifically appropriate response is Nuclear magnetic resonance. Option-wise review: Nuclear magnetic resonance is correct under the condition given in the stem. X-ray absorption is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Ultrasound reflection is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Infrared emission is incorrect because it fails the governing relation or characteristic relevant to this case. Therefore, option B, Nuclear magnetic resonance, is factually and logically consistent with the question. MRI works on the principle of nuclear magnetic resonance (NMR) of hydrogen nuclei in the body.

In concise terms, What is the coefficient of restitution for a perfectly elastic collision? Greater than 1 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. For a perfectly elastic collision the coefficient of restitution e = 1 (no kinetic energy lost).

In concise terms, What is the nature of the image formed by a concave lens for all real objects? — the scientifically appropriate response is Virtual erect diminished. Option-wise review: Virtual erect diminished is correct under the condition given in the stem. Real inverted magnified is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Real inverted diminished is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Virtual erect magnified 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, Virtual erect diminished, is factually and logically consistent with the question. A concave lens always forms a virtual erect and diminished image for all positions of real objects.

In concise terms, What is the relationship between electric power P voltage V and current I? P = V/I is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. 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, P = VI, is factually and logically consistent with the question. Electric power P = VI = I²R = V²/R where V is voltage and I is current.

In concise terms, Which type of wave does not require a medium for propagation? — the scientifically appropriate response is Electromagnetic waves. Option-wise review: Electromagnetic waves is correct under the condition given in the stem. Mechanical waves is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Sound waves is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Seismic waves 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 D, Electromagnetic waves, is factually and logically consistent with the question. Electromagnetic waves (light radio waves etc.) do not require any medium for propagation.

In concise terms, What is the value of universal gravitational constant G? Universal gravitational constant G = 6.67×10⁻¹¹ N·m²/kg² as measured by Cavendish.

cal definition, law, relation, or working principle involved. — the scientifically appropriate response is Pressure applied to enclosed fluid is transmitted equally. Option-wise review: Pressure applied to enclosed fluid is transmitted equally is correct under the condition given in the stem. Pressure decreases with depth is incorrect because it describes a different quantity or phenomenon and does not meet the stated condition. Fluid pressure depends on shape is also incorrect; although it may be a valid physics term, its definition or application is not the one asked here. Pressure and volume are inversely proportional 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, Pressure applied to enclosed fluid is transmitted equally, is factually and logically consistent with the question. Pascal's principle states that pressure applied to an enclosed fluid is transmitted undiminished to all parts.