1
JEE Main 2019 (Online) 12th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A proton and an $$\alpha $$-particle (with their masses in the ratio of 1 : 4 and charges in the ratio of 1 : 2) are accelerated from rest through a potential difference V. If a uniform magnetic field (B) is set up perpendicular to their velocities, the ratio of the radii rp : r$$\alpha $$ of the circular paths described by them will be ;
A
$$1:\sqrt 3 $$
B
1 : 3
C
$$1:\sqrt 2 $$
D
1 : 2
2
JEE Main 2019 (Online) 12th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A passenger train of length 60 m travels at a speed of 80 km/hr. Another freight train of length 120 m travels at a speed of 30 km/hr. The ratio of times taken by the passenger train to completely cross the freight train when : (i) they are moving in the same direction , and (ii) in the opposite direction is :
A
$${{25} \over {11}}$$
B
$${3 \over 2}$$
C
$${{11} \over 5}$$
D
$${5 \over 2}$$
3
JEE Main 2019 (Online) 12th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The output of the given logic circuit is :

JEE Main 2019 (Online) 12th January Morning Slot Physics - Semiconductor Question 167 English
A
$$\overline A B$$
B
$$AB + \overline {AB} $$
C
$$A\overline B + \overline A B$$
D
$$A\overline B $$
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