JEE Main 2021 (Online) 26th February Evening Shift | Properties of Matter Question 88 | Physics

JEE Main 2021 (Online) 26th February Evening Shift

MCQ (Single Correct Answer)

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The length of metallic wire is l₁ when tension in it is T₁. It is l₂ when the tension is T₂. The original length of the wire will be :

$${{{T_1}{l_1} - {T_2}{l_2}} \over {{T_2} - {T_1}}}$$

$${{{l_1} + {l_2}} \over 2}$$

$${{{T_2}{l_1} + {T_1}{l_2}} \over {{T_1} + {T_2}}}$$

$${{{T_2}{l_1} - {T_1}{l_2}} \over {{T_2} - {T_1}}}$$

JEE Main 2021 (Online) 26th February Morning Shift

MCQ (Single Correct Answer)

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A large number of water drops, each of radius r, combine to have a drop of radius R. If the surface tension is T and mechanical equivalent of heat is J, the rise in heat energy per unit volume will be :

$${{2T} \over J}\left( {{1 \over r} - {1 \over R}} \right)$$

$${{3T} \over J}\left( {{1 \over r} - {1 \over R}} \right)$$

$${{3T} \over rJ}$$

$${{2T} \over rJ}$$

JEE Main 2021 (Online) 26th February Morning Shift

MCQ (Single Correct Answer)

-1

The normal density of a material is $$\rho$$ and its bulk modulus of elasticity is K. The magnitude of increase in density of material, when a pressure P is applied uniformly on all sides, will be :

$${{\rho K} \over P}$$

$${{PK} \over \rho }$$

$${{\rho P} \over K}$$

$${K \over {\rho P}}$$

JEE Main 2021 (Online) 24th February Morning Slot

MCQ (Single Correct Answer)

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If Y, K and $$\eta $$ are the values of Young's modulus, bulk modulus and modulus of rigidity of any material respectively. Choose the correct relation for these parameters.

$$Y = {{9K\eta } \over {3K - \eta }}N/{m^2}$$

$$Y = {{9K\eta } \over {2\eta + 3K}}N/{m^2}$$

$$\eta = {{3YK} \over {9K + Y}}N/{m^2}$$

$$K = {{Y\eta } \over {9\eta - 3Y}}N/{m^2}$$

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