1
JEE Main 2018 (Online) 15th April Evening Slot
+4
-1
When an air bubble of radius r rises from the bottom to the surface of a lake its radius becomes $${{5r} \over 4}.$$ Taking the atmospheric pressure to be equal to 10 m height of water column, the depth of the lake would approximately be (ignore the surface tension and the effect of temperature) :
A
11.2 m
B
8.7 m
C
9.5 m
D
10.5 m
2
JEE Main 2018 (Online) 15th April Evening Slot
+4
-1
The value closest to the thermal velocity of a Helium atom at room temperature (300 K) in ms-1 is :
[kB =1.4 $$\times$$ 10-23 J/K; mHe = 7 $$\times$$ 10 -27 kg ]
A
1.3 $$\times$$ 104
B
1.3 $$\times$$ 103
C
1.3 $$\times$$ 105
D
1.3 $$\times$$ 102
3
JEE Main 2018 (Online) 15th April Evening Slot
+4
-1
As shown in the figure, forces of 105 N each are applied in opposite directions, on the upper and lower faces of a cube of side 10 cm, shifting the upper face parallel to itself by 0.5 cm. If the side of another cube of the same material is 20 cm, then under similar conditions as above, the displacement will be :
A
0.25 cm
B
0.37 cm
C
0.75 cm
D
1.00 cm
4
JEE Main 2018 (Online) 15th April Evening Slot
+4
-1
A body takes 10 minutes to cool from 60oC to 50oC. The tempertature of surroundings is constant at 25oC. Then, the temperature of the body after next 10 minutes will be approximately :
A
47oC
B
41oC
C
45oC
D
43oC
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