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Physics MCQs for NEET — Practice Questions with Answers

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Assertion and Reason : Read the assertion and reason carefully to mark the correct option out of the option given below Assertion : Two identical solid balls, one of ivory and the other of wet clay are dropped from the same height on the floor. Both the balls will rise to same height after. Reason : Ivory and wet-clay have same elasticity.

A. If both assertion and reason are true and reason is the correct explanation of the assertion. B. If both assertion and reason are true but reason is not the correct explanation of the assertion. C. If assertion is true but reason is false. D. If assertion and reason both are false.

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Explanation

Young's modulus of a material Y = stress /strain Here, stress force = $ {Restrating \over area }$ force As restoring force is zero. Y = 0

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Assertion and Reason : Read the assertion and reason carefully to mark the correct option out of the option given below Assertion : Identical spring of steel and copper are equally stretched more will be done on the steel spring. Reason : Steel is more elastic than copper.

A. If both assertion and reason are true and reason is the correct explanation of the assertion. B. If both assertion and reason are true but reason is not the correct explanation of the assertion. C. If assertion is true but reason is false. D. If assertion and reason both are false.

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Explanation

$ = { { Ft \over A} \over { x \over y } } $

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A wire is stretched to double the length which of the following is false in this context ?

A. Its volume increased B. Its longitudinal strain is I C. Stress = Young's modulus D. Stress = 2x Young's modulus

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Which is the dimensional formula for modulus of rigidity ?

A. $ M^1 L^1 T^{-2} $ B. $ M^1 L^{-1 } T^{-2} $ C. $ M^1 L^{-2} T^{-1} $ D. $ M^1 L ^ {-2} T^{-2} $

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Explanation

The modulus of rigidity, also known as shear modulus, is the measure of an object's ability to resist deformation under shear stress. Its formula is given by the ratio of shear stress to shear strain. The dimensional formula for shear stress is the same as pressure, which is $M^1 L^{-1} T^{-2}$. Thus, the correct dimensional formula for modulus of rigidity is $M^1 L^{-1} T^{-2}$. Hence, the correct answer is o2.

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When more than 20 kg mass is tied to the end of wire it breaks what is maximum mass that can be tied to the end of a wire of same material with half the radius ?

A. 20 kg B. 5 kg C. 80 kg D. 160 kg

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Explanation

$ Y = { { W \over A} \over { Al \over l} } $

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When 100 N tensile force is applied to a rod of $ 10^{-6} m^2 $ cross-sectional area, its length increases by 1% so young's modulus of material is..........

A. $ 10 ^ {12} Pa $ B. $ 10 ^ {11} Pa $ C. $ 10 ^ {10} Pa $ D. $ 10 ^ {2} Pa $

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A rubber ball when taken to the bottom of a 100 mdeep take decrease in volume by 1% Hence, the bulk modulus of rubber is............$ ( g = 10 m/s^2 ) $

A. $ 10 ^ 6 Pa $ B. $ 10 ^ 8 Pa $ C. $ 10 ^ 7 Pa $ D. $ 10 ^ 9 Pa $

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Explanation

Bulk modulus (K) is given by the formula: $$ K = rac{Pressure}{rac{ ext{Î”}V}{V}} $$ Pressure (P) at a depth h is given by: $$ P = ho g h $$ Assuming the density of water ( ext{Ï}) to be $1000 ext{ kg/m}^3$: $$ P = 1000 ext{ kg/m}^3 imes 10 ext{ m/s}^2 imes 100 ext{ m} = 10^6 ext{ Pa} $$ The fractional change in volume is 1%, or 0.01. Hence, $$ K = rac{10^6 ext{ Pa}}{0.01} = 10^8 ext{ Pa} $$ Therefore, the correct answer is $10^8 ext{ Pa}$, which corresponds to o2.

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Young's modulus of a rigid body is

A. 0 B. 1 C. $ \infty $ D. 0.5

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Explanation

Young's modulus (Y) is a measure of the stiffness of a material. For a perfectly rigid body, there is no deformation regardless of the applied force, meaning the strain is zero. Since Young's modulus is calculated as: $$ Y = rac{Stress}{Strain} $$ If strain is zero, the modulus tends to infinity. Therefore, the correct answer is $$ ext{âˆž} $$ which corresponds to o3.

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Pressure on an object increases from $ 1.01 \times 10^ 5 Pa to 1.165 \times 10^ 5 Pa $. He volume decrease by 10% at constant temperature. Bulk modulus of material is........

A. $ 1.55 \times 10 ^ 5 Pa $ B. $ 51.2 \times 10 ^ 5 Pa $ C. $ 102.4 \times 10 ^ 5 Pa $ D. $ 204.8 \times 10 ^ 5 Pa $

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Cross-sectional area if wire of length Lis A. Young's modulus of material is Y. If this wire acts as a spring what is the value of force constant ?

A. YA/L B. YA/2L C. 2YA/L D. YL/A

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Explanation

$ Y = { F \over A} { L \over \triangle L } $

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