1
JEE Main 2017 (Online) 8th April Morning Slot
+4
-1 In an experiment, a sphere of aluminium of mass 0.20 kg is heated upto 150oC. Immediately, it is put into water of volume 150 cc at 27oC kept in a calorimeter of water equivalent to 0.025 kg. Final temperature of the system is 40oC. The specific heat of aluminium is : (take 4.2 Joule = 1 calorie)
A
378 J/kg $$-$$oC
B
315 J/kg $$-$$oC
C
476 J/kg $$-$$oC
D
434 J/kg $$-$$oC
2
JEE Main 2017 (Online) 8th April Morning Slot
+4
-1 A compressive force, F is applied at the two ends of a long thin steel rod. It is heated, simultaneously, such that its temperature increases by $$\Delta$$T. The net change in its length is zero. Let $$\ell$$ be the length of the rod, A its area of cross-section,Y its Young’s modulus, and $$\alpha$$ its coefficient of linear expansion. Then, F is equal to :
A
$$\ell$$2 Y$$\alpha$$ $$\Delta$$T
B
$$\ell$$A Y$$\alpha$$ $$\Delta$$T
C
A Y$$\alpha$$ $$\Delta$$T
D
$${{AY} \over {\alpha \,\Delta T}}$$
3
JEE Main 2017 (Offline)
+4
-1 A man grows into a giant such that his linear dimensions increase by a factor of 9. Assuming that his density remains same, the stress in the leg will change by a factor of:
A
$${1 \over {81}}$$
B
9
C
$${1 \over {9}}$$
D
81
4
JEE Main 2017 (Offline)
+4
-1 A copper ball of mass 100 gm is at a temperature T. It is dropped in a copper calorimeter of mass 100 gm, filled with 170 gm of water at room temperature. Subsequently, the temperature of the system is found to be 75oC. T is given by: (Given : room temperature = 30oC, specific heat of copper = 0.1 cal/gmoC)
A
825oC
B
800oC
C
885oC
D
1250oC
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