1
JEE Main 2019 (Online) 12th January Morning Slot
+4
-1
What is the position and nature of image formed by lens combination shown in figure ? (f1, f2 are focal lengths)

A
$${{20} \over 3}$$ cm from point B at right, real
B
70 cm from point B at right ; real
C
40 cm from point B at right; real
D
70 cm from point B at left ; virtual
2
JEE Main 2019 (Online) 12th January Morning Slot
+4
-1
A straight rod of length L extends from x = a to x = L + a. The gravitational force it exerts on a point mass 'm' at x = 0, if the mass per unit length of the rod is A + Bx2 , is given by :
A
$$Gm\left[ {A\left( {{1 \over a} - {1 \over {a + L}}} \right) - BL} \right]$$
B
$$Gm\left[ {A\left( {{1 \over a} - {1 \over {a + L}}} \right) + BL} \right]$$
C
$$Gm\left[ {A\left( {{1 \over {a + L}} - {1 \over a}} \right) + BL} \right]$$
D
$$Gm\left[ {A\left( {{1 \over {a + L}} - {1 \over a}} \right) - BL} \right]$$
3
JEE Main 2019 (Online) 12th January Morning Slot
+4
-1
An ideal battery of 4 V and resistance R are connected in series in the primary circuit of a potentiometer of length 1 m and esistance 5 $$\Omega$$. The value of R, to give a potential difference of 5 mV across 10 cm of potentiometer wire, is :
A
480 $$\Omega$$
B
495 $$\Omega$$
C
490 $$\Omega$$
D
395 $$\Omega$$
4
JEE Main 2019 (Online) 12th January Morning Slot
+4
-1
A satellite of mass M is in a circular orbit of radius R about the centre of the earth. A meteorite of the same mass, falling towards the earth, collides with the satellite completely inelastically. The speeds of the satellite and the meteorite are the same, just before the collision. The subsequent motion of the combined body will be :
A
in the same circular orbit of radius R
B
such that it escapes to infinity
C
in a circular orbit of a different radius
D
in an elliptical orbit
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