1
JEE Main 2021 (Online) 25th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
The truth table for the following logic circuit is :

JEE Main 2021 (Online) 25th February Evening Shift Physics - Semiconductor Question 101 English
A
JEE Main 2021 (Online) 25th February Evening Shift Physics - Semiconductor Question 101 English Option 1
B
JEE Main 2021 (Online) 25th February Evening Shift Physics - Semiconductor Question 101 English Option 2
C
JEE Main 2021 (Online) 25th February Evening Shift Physics - Semiconductor Question 101 English Option 3
D
JEE Main 2021 (Online) 25th February Evening Shift Physics - Semiconductor Question 101 English Option 4
2
JEE Main 2021 (Online) 25th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
A stone is dropped from the top of a building. When it crosses a point 5 m below the top, another stone starts to fall from a point 25 m below the top. Both stones reach the bottom of building simultaneously. The height of the building is :
A
50 m
B
25 m
C
45 m
D
35 m
3
JEE Main 2021 (Online) 25th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
The stopping potential for electrons emitted from a photosensitive surface illuminated by light of wavelength 491 nm is 0.710 V. When the incident wavelength is changed to a new value, the stopping potential is 1.43 V. The new wavelength is :
A
400 nm
B
329 nm
C
309 nm
D
382 nm
4
JEE Main 2021 (Online) 25th February Evening Shift
Numerical
+4
-1
Out of Syllabus
Change Language
A reversible heat engine converts one-fourth of the heat input into work. When the temperature of the sink is reduced by 52K, its efficiency is doubled. The temperature in Kelvin of the source will be __________.
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