1
JEE Main 2019 (Online) 9th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The area of a square is 5.29 cm2. The area of 7 such squares taking into account the significant figures is :-
A
37.0 cm2
B
37 cm2
C
37.030 cm2
D
37.03 cm2
2
JEE Main 2019 (Online) 9th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
50 W/m2 energy density of sunlight is normally incident on the surface of a solar panel. Some part of incident energy (25%) is reflected from the surface and the rest is absorbed. The force exerted on 1m2 surface area will be close to (c = 3 × 108 m/s) :-
A
20 × 10–8 N
B
35 × 10–8 N
C
10 × 10–8 N
D
15 × 10–8 N
3
JEE Main 2019 (Online) 9th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The physical sizes of the transmitter and receiver antenna in a communication system are :-
A
proportional to carrier frequency
B
inversely proportional to carrier frequency
C
inversely proportional to modulation frequency
D
independent of both carrier and modulation frequency
4
JEE Main 2019 (Online) 9th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Four point charges –q, +q, +q and –q are placed on y-axis at y = –2d, y = –d, y = +d and y = +2d, respectively. The magnitude of the electric field E at a point on the x-axis at x = D, with D >> d, will behave as :-
A
$$E \propto {1 \over D^3}$$
B
$$E \propto {1 \over D}$$
C
$$E \propto {1 \over D^4}$$
D
$$E \propto {1 \over D^2}$$
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