1
JEE Main 2019 (Online) 9th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The parallel combination of two air filled parallel plate capacitors of capacitance C and nC is connected to a battery of voltage, V. When the capacitors are fully charged, the battery is removed and after that a dielectric material of dielectric constant K is placed between the two plates of the first capacitor. The new potential difference of the combined system is :-
A
V
B
$${V \over {K + n}}$$
C
$${{(n+1)V} \over {K + n}}$$
D
$${{nV} \over {K + n}}$$
2
JEE Main 2019 (Online) 9th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A He+ ion is in its first excited state. Its ionization energy is :-
A
13.60 eV
B
6.04 eV
C
48.36 eV
D
54.40 eV
3
JEE Main 2019 (Online) 9th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Two materials having coefficients of thermal conductivity '3K' and 'K' and thickness 'd' and '3d', respectively, are joined to form a slab as shown in the figure. The temperatures of the outer surfaces are '$$\theta $$2' and '$$\theta $$1' respectively, ($$\theta $$2 > $$\theta $$1). The temperature at the interface is :-

JEE Main 2019 (Online) 9th April Evening Slot Physics - Heat and Thermodynamics Question 283 English
A
$${{{\theta _1}} \over {10}} + {{9{\theta _2}} \over {10}}$$
B
$${{{\theta _2} + {\theta _1}} \over 2}$$
C
$${{{\theta _1}} \over {6}} + {{5{\theta _2}} \over {6}}$$
D
$${{{\theta _1}} \over {3}} + {{2{\theta _2}} \over {3}}$$
4
JEE Main 2019 (Online) 9th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A wedge of mass M = 4m lies on a frictionless plane. A particle of mass m approaches the wedge with speed v. There is no friction between the particle and the plane or between the particle and the wedge. The maximum height climbed by the particle on the wedge is given by :-
A
$${{{v^2}} \over {g}}$$
B
$${{2{v^2}} \over {7g}}$$
C
$${{{v^2}} \over {2g}}$$
D
$${{2{v^2}} \over {5g}}$$
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