JEE Main 2020 (Online) 9th January Evening Slot | Properties of Matter Question 106 | Physics

JEE Main 2020 (Online) 9th January Evening Slot

MCQ (Single Correct Answer)

-1

A small spherical droplet of density d is floating exactly half immersed in a liquid of density $$\rho $$ and surface tension T. The radius of the droplet is (take note that the surface tension applies an upward force on the droplet) :

$$r = \sqrt {{T \over {\left( {d - \rho } \right)g}}} $$

$$r = \sqrt {{{2T} \over {3\left( {d + \rho } \right)g}}} $$

$$r = \sqrt {{T \over {\left( {d + \rho } \right)g}}} $$

$$r = \sqrt {{{3T} \over {\left( {2d - \rho } \right)g}}} $$

JEE Main 2020 (Online) 9th January Evening Slot

MCQ (Single Correct Answer)

-1

Two steel wires having same length are suspended from a ceiling under the same load. If the ratio of their energy stored per unit volume is 1 : 4, the ratio of their diameters is:

1 : 2

2 : 1

$$1:\sqrt 2 $$

$$\sqrt 2 :1$$

JEE Main 2020 (Online) 9th January Morning Slot

MCQ (Single Correct Answer)

-1

Water flows in a horizontal tube (see figure).
The pressure of water changes by 700 Nm^–2
between A and B where the area of cross section
are 40 cm² and 20 cm², respectively. Find the
rate of flow of water through the tube.
(density of water = 1000 kgm^–3) JEE Main 2020 (Online) 9th January Morning Slot Physics - Properties of Matter Question 108 English

JEE Main 2020 (Online) 9th January Morning Slot Physics - Properties of Matter Question 108 English

1810 cm³/s

2420 cm³/s

3020 cm³/s

2720 cm³/s

JEE Main 2020 (Online) 8th January Evening Slot

MCQ (Single Correct Answer)

-1

Two liquids of densities $${\rho _1}$$ an $${\rho _2}$$ ($${\rho _2}$$ = 2$${\rho _1}$$) are filled up behind a square wall of side 10 m as shown in figure. Each liquid has a height of 5 m. The ratio of the forces due to these liquids exerted on upper part MN to that at the lower part NO is (Assume that the liquids are not mixing) JEE Main 2020 (Online) 8th January Evening Slot Physics - Properties of Matter Question 109 English