1
WB JEE 2022
MCQ (Single Correct Answer)
+1
-0.25
Change Language

If a string, suspended from the ceiling is given a downward force F1, its length becomes L1. Its length is L2, if the downward force is F2. What is its actual length?

A
$${{{L_1} + {L_2}} \over 2}$$
B
$$\sqrt {{L_1}{L_2}} $$
C
$${{{F_2}{L_1} + {F_1}{L_2}} \over {{F_2} + {F_1}}}$$
D
$${{{F_2}{L_1} - {F_1}{L_2}} \over {{F_2} - {F_1}}}$$
2
WB JEE 2022
MCQ (Single Correct Answer)
+1
-0.25
Change Language

27 drops of mercury coalesce to form a bigger drop. What is the relative increase in surface energy?

A
$${3 \over 2}$$
B
$${2 \over 3}$$
C
$$-$$$${2 \over 3}$$
D
8
3
WB JEE 2022
MCQ (Single Correct Answer)
+1
-0.25
Change Language

Certain amount of an ideal gas is taken from its initial state 1 to final state 4 through the paths 1 $$\to$$ 2 $$\to$$ 3 $$\to$$ 4 as shown in figure. AB, CD, EF are all isotherms. If vp is the most probable speed of the molecules, then

WB JEE 2022 Physics - Heat and Thermodynamics Question 13 English

A
vp at 3 = vp at 4 > vp at 2 > vp at 1
B
vp at 3 > vp at 1 > vp at 2 > vp at 4
C
vp at 3 > vp at 2 > vp at 4 > vp at 1
D
vp at 2 = vp at 3 > vp at 1 > vp at 4
4
WB JEE 2022
MCQ (Single Correct Answer)
+1
-0.25
Change Language

Consider a thermodynamic process where integral energy $$U = A{P^2}V$$ (A = constant). If the process is performed adiabatically, then

A
AP2(V + 1) = constant
B
(AP + 1)2V = constant
C
(AP + 1)V2 = constant
D
$${V \over {{{(AP + 1)}^2}}}$$ = constant
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