JEE Main 2019 (Online) 11th January Morning Slot | Properties of Matter Question 135 | Physics

JEE Main 2019 (Online) 11th January Morning Slot

MCQ (Single Correct Answer)

-1

A liquid of density $$\rho $$ is coming out of a hose pipe of radius a with horizontal speed $$\upsilon $$ and hits a mesh. 50% of the liquid passes through the mesh unaffected. 25% looses all of its momentum and 25% comes back with the same speed. The resultant pressure on the mesh will be :

$${3 \over 4}\rho {v^2}$$

$${1 \over 4}\rho {v^2}$$

$${1 \over 2}\rho {v^2}$$

$$\rho {v^2}$$

JEE Main 2019 (Online) 10th January Morning Slot

MCQ (Single Correct Answer)

-1

Water flows into a large tank with flat bottom at the rate of 10^–4m³s^–1. Water is also leaking out of a hole ofarea 1 cm² at its bottom. If the height of the water in the tank remains steady, then this height is -

2.9 cm

5.1 cm

4 cm

1.7 cm

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 :

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

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

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

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

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