1
JEE Main 2021 (Online) 31st August Morning Shift
Numerical
+4
-1
Change Language
An electric instrument consists of two units. Each unit must function independently for the instrument to operate. The probability that the first unit functions is 0.9 and that of the second unit is 0.8. The instrument is switched on and it fails to operate. If the probability that only the first unit failed and second unit is functioning is p, then 98 p is equal to _____________.
Your input ____
2
JEE Main 2021 (Online) 31st August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
A helicopter is flying horizontally with a speed 'v' at an altitude 'h' has to drop a food packet for a man on the ground. What is the distance of helicopter from the man when the food packet is dropped?
A
$$\sqrt {{{2gh{v^2} + 1} \over {{h^2}}}} $$
B
$$\sqrt {2gh{v^2} + {h^2}} $$
C
$$\sqrt {{{2{v^2}h} \over g} + {h^2}} $$
D
$$\sqrt {{{2gh} \over {{v^2}}} + {h^2}} $$
3
JEE Main 2021 (Online) 31st August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
In the following logic circuit the sequence of the inputs A, B are (0, 0), (0, 1), (1, 0) and (1, 1). The output Y for this sequence will be :

JEE Main 2021 (Online) 31st August Morning Shift Physics - Semiconductor Question 71 English
A
1, 0, 1, 0
B
0, 1, 0, 1
C
1, 1, 1, 0
D
0, 0, 1, 1
4
JEE Main 2021 (Online) 31st August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Two particles A and B having charges 20$$\mu$$C and $$-$$5$$\mu$$C respectively are held fixed with a separation of 5 cm. At what position a third charged particle should be placed so that it does not experience a net electric force?

JEE Main 2021 (Online) 31st August Morning Shift Physics - Electrostatics Question 83 English
A
At 5 cm from 20 $$\mu$$C on the left side of system
B
At 5 cm from $$-$$5 $$\mu$$C on the right side
C
At 1.25 cm from $$-$$5 $$\mu$$C between two charges
D
At midpoint between two charges
JEE Main Papers
2023
2021
EXAM MAP
Medical
NEET
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
CBSE
Class 12