1
JEE Main 2021 (Online) 26th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The presence of ozone in troposphere :
A
protects us from greenhouse effect
B
protects us from the UV radiation
C
protects us from the X-ray radiation
D
generates photochemical smog
2
JEE Main 2021 (Online) 26th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : Dipole-dipole interactions are the only non-covalent interactions, resulting in hydrogen bond formation.

Reason R : Fluorine is the most electronegative element and hydrogen bonds in HF are symmetrical.

In the light of the above statements, choose the most appropriate answer from the options given below :
A
Both A and R are true and R is the correct explanation of A
B
A is true but R is false
C
A is false but R is true
D
Both A and R are true but R is NOT the correct explanation of A
3
JEE Main 2021 (Online) 26th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Which one of the following lanthanoids does not form MO2? [M is lanthanoid metal]
A
Nd
B
Dy
C
Yb
D
Pr
4
JEE Main 2021 (Online) 26th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Match List - I with List - II.

List - I (Ore) List - II (Element Present)
(a) Kernite (i) Tin
(b) Cassiterite (ii) Boron
(c) Calamine (iii) Fluorine
(d) Cryolite (iv) Zinc


Choose the most appropriate answer from the options given below :
A
(a) $$ \to $$ (i), (b) $$ \to $$ (iii), (c) $$ \to $$ (iv), (d) $$ \to $$ (ii)
B
(a) $$ \to $$ (iii), (b) $$ \to $$ (i), (c) $$ \to $$ (ii), (d) $$ \to $$ (iv)
C
(a) $$ \to $$ (ii), (b) $$ \to $$ (i), (c) $$ \to $$ (iv), (d) $$ \to $$ (iii)
D
(a) $$ \to $$ (ii), (b) $$ \to $$ (iv), (c) $$ \to $$ (i), (d) $$ \to $$ (iii)
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