1
WB JEE 2019
+2
-0.5
Two identical blocks of ice move in opposite directions with equal speed and collide with each other. What will be the minimum speed required to make both the blocks melt completely, if the initial temperatures of the blocks were $$-$$8$$^\circ$$C each? (Specific heat of ice is 2100 Jkg$$-$$1K$$-$$1 and latent heat of fusion of ice is 3.36 $$\times$$ 105 Jkg$$-$$1)
A
840 ms$$-$$1
B
420 ms$$-$$1
C
8.4 ms$$-$$1
D
84ms$$-$$1
2
WB JEE 2018
+1
-0.25
The water equivalent of a calorimeter is 10 g and it contains 50 g of water at 15$$^\circ$$C. Some amount of ice, initially at $$-$$ 10$$^\circ$$C is dropped in it and half of the ice melts till equilibrium is reached. What was the initial amount of ice that was dropped (when specific heat of ice = 0.5 cal gm$$-$$1 $$^\circ$$C$$-$$1, specific heat of water = 10 cal gm$$-$$1 $$^\circ$$C$$-$$1 and latent heat of melting of ice = 80 cal gm$$-$$1) ?
A
10 g
B
18 g
C
20 g
D
30 g
3
WB JEE 2018
+1
-0.25
One mole of a monoatomic ideal gas undergoes a quasistatic process, which is depicted by a straight line joining points $$({V_0},{T_0})$$ and $$({2V_0},{3T_0})$$ in a V-T diagram. What is the value of the heat capacity of the gas at the point $$({V_0},{T_0})$$?
A
R
B
$${3 \over 2}R$$
C
2R
D
0
4
WB JEE 2018
+1
-0.25
For an ideal gas with initial pressure and volume pi and Vi respectively, a reversible isothermal expansion happens, when its volume becomes V0. Then, it is compressed to its original volume Vi by a reversible adiabatic process. If the final pressure is pf, then which of the following statement(s) is/are true?
A
pf = pi
B
pf > pi
C
pf < pi
D
$${{{p_f}} \over {{V_0}}}\, = \,{{{p_i}} \over {{V_i}}}$$
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Medical
NEET