1
WB JEE 2018
MCQ (Single Correct Answer)
+1
-0.25
Change Language
What will be the approximate terminal velocity of a rain drop of diameter $${1.8 \times {{10}^{ - 3}}}$$ m, when density of rain water $$ \approx $$ $${1.8 \times {{10}^{ - 5}}}$$ N-sm$$-$$2 (Neglect buoyancy of air)
A
49 ms$$-$$1
B
98ms$$-$$1
C
392 ms$$-$$1
D
980 ms$$-$$1
2
WB JEE 2017
MCQ (Single Correct Answer)
+1
-0.25
Change Language
A uniform capillary tube of length l and inner radius r with its upper end sealed is submerged vertically into water. The outside pressure is p0 and surface tension of water is $$\gamma$$. When a length x of the capillary is submerged into water, it is found that water levels inside and outside the capillary coincide. The value of x is
A
$${l \over {\left( {1 + {{{p_0}r} \over {4\gamma }}} \right)}}$$
B
$$\left( {1 - {{{p_0}r} \over {4\gamma }}} \right)$$
C
$$\left( {1 - {{{p_0}r} \over {2\gamma }}} \right)$$
D
$${l \over {\left( {1 + {{{p_0}r} \over {2\gamma }}} \right)}}$$
3
WB JEE 2017
MCQ (Single Correct Answer)
+1
-0.25
Change Language
A liquid of bulk modulus k is compressed by applying an external pressure such that its density increases by 0.01%. The pressure applied on the liquid is
A
$${k \over {10000}}$$
B
$${k \over {1000}}$$
C
1000 k
D
0.01 k
4
WB JEE 2017
MCQ (Single Correct Answer)
+1
-0.25
Change Language
A solid rectangular sheet has two different coefficients of linear expansion $$\alpha$$1 and $$\alpha$$2 along its length and breadth respectively. The coefficient of surface expansion is (for $$\alpha$$1 t << 1, $$\alpha$$2t < <1)
A
$${{{\alpha _1} + {\alpha _2}} \over 2}$$
B
$$2({\alpha _1} + {\alpha _2})$$
C
$${{4{\alpha _1}{\alpha _2}} \over {{\alpha _1} + {\alpha _2}}}$$
D
$${\alpha _1} + {\alpha _2}$$
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