1
JEE Main 2017 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The mass density of a spherical body is given by
$$\rho $$ (r) = $${k \over r}$$ for r $$ \le $$ R and $$\rho $$ (r) = 0 for r > R,

where r is the distance from the centre.

The correct graph that describes qualitatively the acceleration, a, of a test particle as a function of r is :
A
JEE Main 2017 (Online) 9th April Morning Slot Physics - Gravitation Question 144 English Option 1
B
JEE Main 2017 (Online) 9th April Morning Slot Physics - Gravitation Question 144 English Option 2
C
JEE Main 2017 (Online) 9th April Morning Slot Physics - Gravitation Question 144 English Option 3
D
JEE Main 2017 (Online) 9th April Morning Slot Physics - Gravitation Question 144 English Option 4
2
JEE Main 2017 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Four closed surfaces and corresponding charge distributions are shown below.

JEE Main 2017 (Online) 9th April Morning Slot Physics - Electrostatics Question 159 English

Let the respective electric fluxes through the surfaces be $${\Phi _1},$$ $${\Phi _2},$$ $${\Phi _3}$$ and $${\Phi _4}$$. Then :
A
$${\Phi _1}$$ < $${\Phi _2}$$ = $${\Phi _3}$$ > $${\Phi _4}$$
B
$${\Phi _1}$$ > $${\Phi _2}$$ > $${\Phi _3}$$ > $${\Phi _4}$$
C
$${\Phi _1}$$ = $${\Phi _2}$$ = $${\Phi _3}$$ = $${\Phi _4}$$
D
$${\Phi _1}$$ > $${\Phi _3}$$ ; $${\Phi _2}$$ < $${\Phi _4}$$
3
JEE Main 2017 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A combination of parallel plate capacitors is maintained at a certain potential difference.

JEE Main 2017 (Online) 9th April Morning Slot Physics - Capacitor Question 112 English

When a 3 mm thick slab is introduced between all the plates, in order to maintain the same potential difference, the distance between the plates is increased by 2.4 mm. Find the dielectric constant of the slab.
A
3
B
4
C
5
D
6
4
JEE Main 2017 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
In a meter bridge experiment resistances are connected as shown in the figure. Initially resistance P = 4 $$\Omega $$ and the neutral point N is at 60 cm from A. Now an unknown resistance R is connected in series to P and the new position of the neutral point is at 80 cm from A. The value of unknown resistance R is :

JEE Main 2017 (Online) 9th April Morning Slot Physics - Current Electricity Question 244 English
A
$${{33} \over 5}\,\Omega $$
B
6 $$\,\Omega $$
C
7 $$\,\Omega $$
D
$${{20} \over 3}\,\Omega $$
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