1
JEE Advanced 2019 Paper 1 Offline
MCQ (More than One Correct Answer)
+4
-1
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Let us consider a system of units in which mass and angular momentum are dimensionless. If length has dimension of L, which of the following statement(s) is/are correct?
A
The dimension of force is [L]-3
B
The dimension of power is [L]-5
C
The dimension of energy is [L]-2
D
The dimension of linear momentum is [L]-1
2
JEE Advanced 2019 Paper 1 Offline
Numerical
+3
-0
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A parallel plate capacitor of capacitance C has spacing d between two plates having area A. The region between the plates is filled with N dielectric layers, parallel to its plates, each with thickness, $$\delta = {d \over N}$$. The dielectric constant of the mth layer is $${K_m} = K\left( {1 + {m \over N}} \right)$$. For a very large N(>103), the capacitance C is $$\alpha \left( {{{K{\varepsilon _0}A} \over {d\ln 2}}} \right)$$

The value of $$\alpha $$ will be ..................

[$$ \in $$0 is the permittivity of free space.]
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3
JEE Advanced 2019 Paper 1 Offline
Numerical
+3
-0
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A planar structure of length L and width W is made of two different optical media of refractive indices n1 = 1.5 and n2 = 1.44 as shown in figure. If L >> W, a ray entering from end AB will emerge from end CD. CD only if the total internal reflection condition is met inside the structure. For L = 9.6 m, if the incident angle $$\theta $$ is varied, the maximum time taken by a ray to exit the plane CD is t $$ \times $$ 10-9 s, where, t is ................

[Speed of light, c = 3 $$ \times $$ 108 m/s]

JEE Advanced 2019 Paper 1 Offline Physics - Geometrical Optics Question 49 English
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4
JEE Advanced 2019 Paper 1 Offline
Numerical
+3
-0
Change Language
A block of weight 100 N is suspended by copper and steel wires of same cross-sectional area 0.5 cm2 and length $$\sqrt 3 $$ m and 1 m, respectively. Their other ends are fixed on a ceiling as shown in figure. The angles subtended by copper and steel wires with ceiling are 30$$^\circ $$ and 60$$^\circ $$, respectively. If elongation in copper wire is ($$\Delta {l_c}$$) and elongation in steel wire is ($$\Delta {l_s}$$), then the ratio $${{\Delta {l_c}} \over {\Delta {l_s}}}$$ is .............. .

[Young's modulus for copper and steel are 1 $$ \times $$ 1011 N/m2 and 2 $$ \times $$ 1011 N/m2 respectively.]

JEE Advanced 2019 Paper 1 Offline Physics - Properties of Matter Question 29 English
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