JEE Main 2021 (Online) 16th March Evening Shift | Properties of Matter Question 86 | Physics

JEE Main 2021 (Online) 16th March Evening Shift

MCQ (Single Correct Answer)

-1

What will be the nature of flow of water from a circular tap, when its flow rate increased from 0.18 L/min to 0.48 L/min? The radius of the tap and viscosity of water are 0.5 cm and 10^$$-$$3 Pa s, respectively. (Density of water : 10³ kg/m³)

Steady flow to unsteady flow

Unsteady to steady flow

Remains turbulent flow

Remains steady flow

JEE Main 2021 (Online) 16th March Morning Shift

MCQ (Single Correct Answer)

-1

The pressure acting on a submarine is 3 $$\times$$ 10⁵ Pa at a certain depth. If the depth is doubled, the percentage increase in the pressure acting on the submarine would be :

(Assume that atmospheric pressure is 1 $$\times$$ 10⁵ Pa density of water is 10³ kg m^$$-$$3, g = 10 ms^$$-$$2)

$${{200} \over 5}$$%

$${{200} \over 3}$$%

$${{3} \over 200}$$%

$${{5} \over 200}$$%

JEE Main 2021 (Online) 26th February Evening Shift

MCQ (Single Correct Answer)

-1

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)

-1

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 :

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

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

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

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

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