1
JEE Main 2021 (Online) 17th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
The vernier scale used for measurement has a positive zero error of 0.2 mm. If while taking a measurement it was noted that '0' on the vernier scale lies between 8.5 cm and 8.6 cm, vernier coincidence is 6, then the correct value of measurement is ___________ cm. (least count = 0.01 cm)
A
8.58 cm
B
8.54 cm
C
8.56 cm
D
8.36 cm
2
JEE Main 2021 (Online) 17th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
A current of 10A exists in a wire of cross-sectional area of 5 mm2 with a drift velocity of 2 $$\times$$ 10$$-$$3 ms$$-$$1. The number of free electrons in each cubic meter of the wire is ___________.
A
625 $$\times$$ 1025
B
1 $$\times$$ 1023
C
2 $$\times$$ 1025
D
2 $$\times$$ 106
3
JEE Main 2021 (Online) 17th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
The output of the given combination gates represents :

JEE Main 2021 (Online) 17th March Morning Shift Physics - Semiconductor Question 93 English
A
AND Gate
B
NOR Gate
C
NAND Gate
D
XOR Gate
4
JEE Main 2021 (Online) 17th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Which level of the single ionized carbon has the same energy as the ground state energy of hydrogen atom?
A
8
B
6
C
1
D
4
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