1
JEE Main 2020 (Online) 4th September Morning Slot
+4
-1
A air bubble of radius 1 cm in water has an upward acceleration 9.8 cm s–2. The density of water is 1 gm cm–3 and water offers negligible drag force on the bubble. The mass of the bubble is (g = 980 cm/s2).
A
1.52 gm
B
4.51 gm
C
3.15 gm
D
4.15 gm
2
JEE Main 2020 (Online) 3rd September Morning Slot
+4
-1
Pressure inside two soap bubbles are 1.01 and 1.02 atmosphere, respectively. The ratio of their volumes is :
A
4 : 1
B
8 : 1
C
2 : 1
D
0.8 : 1
3
JEE Main 2020 (Online) 2nd September Evening Slot
+4
-1
A capillary tube made of glass of radius 0.15 mm is dipped vertically in a beaker filled with methylene iodide (surface tension = 0.05 Nm–1, density = 667 kg m–3) which rises to height h in the tube. It is observed that the two tangents drawn from liquid-glass interfaces (from opp. sides of the capillary) make an angle of 60o with one another. Then h is close to (g = 10 ms–2)
A
0.049 m
B
0.087 m
C
0.137 m
D
0.172 m
4
JEE Main 2020 (Online) 2nd September Morning Slot
+4
-1
A cylindrical vessel containing a liquid is rotated about its axis so that the liquid rises at its sides as shown in the figure. The radius of vessel is 5 cm and the angular speed of rotation is $$\omega$$ rad s–1. The difference in the height, h (in cm) of liquid at the centre of vessel and at the side will be :
A
$${{2{\omega ^2}} \over {25g}}$$
B
$${{5{\omega ^2}} \over {2g}}$$
C
$${{25{\omega ^2}} \over {2g}}$$
D
$${{2{\omega ^2}} \over {5g}}$$
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