JEE Main 2019 (Online) 9th January Evening Slot | Properties of Matter Question 137 | Physics

JEE Main 2019 (Online) 9th January Evening Slot

MCQ (Single Correct Answer)

-1

The top of a water tank is open to air and its water level is mainted. It is giving out 0.74 m³ water per minute through a circular opening of 2 cm radius in its wall. The depth of the center of the opening from the level of water in the tank is close to :

6.0 m

4.8 m

9.6 m

2.9 m

JEE Main 2019 (Online) 9th January Morning Slot

MCQ (Single Correct Answer)

-1

A rod, of length L at room temperature and uniform area of cross section A, is made of a metal having coefficient of linear expansion $$\alpha $$/^oC. It is observed that an external compressive force F, is applied on each of its ends, prevents any change in the length of the rod, when its temperature rises by $$\Delta $$TK. Young's modulus, Y, for this metal is :

$${F \over {A\alpha \Delta T}}$$

$${F \over {A\alpha (\Delta T - 273)}}$$

$${F \over {2A\alpha \Delta T}}$$

$${{2F} \over {A\alpha \Delta T}}$$

JEE Main 2018 (Online) 16th April Morning Slot

MCQ (Single Correct Answer)

-1

A small soap bubble of radius 4 cm is trapped inside another bubble of radius 6 cm without any contact. Let P₂ be the pressure inside the inner bubble and P₀, the pressure outside the outer bubble. Radius of another bubble with pressure difference P₂ $$-$$ P₀ between its inside and outside would be :

12 cm

2.4 cm

6 cm

4.8 cm

JEE Main 2018 (Offline)

MCQ (Single Correct Answer)

-1

A solid sphere of radius r made of a soft material of bulk modulus K is surrounded by a liquid in a cylindrical container. A massless piston of area a floats on the surface of the liquid, covering entire cross section of cylindrical container. When a mass m is placed on the surface of the piston to compress the liquid, the fractional decrement in the radius of the sphere, $$\left( {{dr \over r}} \right)$$ is:

$${{mg} \over {Ka}}$$

$${{Ka} \over {mg}}$$

$${{Ka} \over {3mg}}$$

$${{mg} \over {3Ka}}$$

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