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                                           7
th
 January 2020 (Shift 1), Mathematics                                                        Page | 1  
 
Date: 7
th
 January 2020 (Shift 1) 
Time: 9:30 A.M. to 12:30 P.M. 
Subject: Mathematics 
 
1. The area of the region enclosed by the circle ?? 2
+ ?? 2
= 2 which is not common to the region 
bounded by the parabola ?? 2
= ?? and the straight line ?? = ?? , is 
a. 
1
12
( 24?? - 1) b. 
1
6
( 12?? - 1)
c. 
1
12
( 6?? - 1) d. 
1
12
( 12?? - 1) 
Answer: ( b) 
Solution: 
Required area = area of the circle – area bounded by given line and parabola 
    
Required area = ?? ?? 2
- ? ( ?? - ?? 2
) ????
1
0
 
Area = 2?? - (
?? 2
2
-
?? 3
3
)
0
1
= 2?? -
1
6
  sq. units 
 
2. If ?? ( ?? ) = ?? 2
+ ?? - 1 and ( ?????? ) ( ?? ) = 4?? 2
- 10?? + 5, then ?? (
5
4
) is 
a. 
1
2
 b. -
1
2
c. -
1
3
 d. 
1
3
 
Answer: ( b) 
Solution: 
?? ( ?? ) = ?? 2
+ ?? - 1  
Page 2


                                           7
th
 January 2020 (Shift 1), Mathematics                                                        Page | 1  
 
Date: 7
th
 January 2020 (Shift 1) 
Time: 9:30 A.M. to 12:30 P.M. 
Subject: Mathematics 
 
1. The area of the region enclosed by the circle ?? 2
+ ?? 2
= 2 which is not common to the region 
bounded by the parabola ?? 2
= ?? and the straight line ?? = ?? , is 
a. 
1
12
( 24?? - 1) b. 
1
6
( 12?? - 1)
c. 
1
12
( 6?? - 1) d. 
1
12
( 12?? - 1) 
Answer: ( b) 
Solution: 
Required area = area of the circle – area bounded by given line and parabola 
    
Required area = ?? ?? 2
- ? ( ?? - ?? 2
) ????
1
0
 
Area = 2?? - (
?? 2
2
-
?? 3
3
)
0
1
= 2?? -
1
6
  sq. units 
 
2. If ?? ( ?? ) = ?? 2
+ ?? - 1 and ( ?????? ) ( ?? ) = 4?? 2
- 10?? + 5, then ?? (
5
4
) is 
a. 
1
2
 b. -
1
2
c. -
1
3
 d. 
1
3
 
Answer: ( b) 
Solution: 
?? ( ?? ) = ?? 2
+ ?? - 1  
                                           7
th
 January 2020 (Shift 1), Mathematics                                                        Page | 2  
 
?????? ( ?? ) = 4?? 2
- 10?? + 5 
?? ( ?? ( ?? ) ) = 4?? 2
- 10?? + 5 
?? 2
( ?? )+ ?? ( ?? )- 1 = 4?? 2
- 10?? + 5  
Putting ?? =
5
4
 & ?? (
5
4
) = ?? 
?? 2
+ ?? +
1
4
= 0 
?? = -
1
2
 
?? (
5
4
) = -
1
2
  
 
3. If ?? = ?? ( ?? ) is the solution of the differential equation ?? ?? (
????
????
- 1) = ?? ?? such that ?? ( 0) = 0, then 
?? ( 1) is equal to 
a. ln2 b. 2 + ln2
c. 1 + ln2 d. 3 + ln2
Answer: ( c) 
Solution: 
?? ?? ( ?? '
- 1) = ?? ?? 
?
????
????
= ?? ?? -?? + 1 
Let ?? - ?? = ?? 
      1 -
????
????
=
????
????
 
So, we can write  
? 1 -
????
????
= ?? ?? + 1 
? -?? -?? ???? = ???? 
? ?? -?? = ?? + ?? 
? ?? ?? -?? = ?? + ??  
1 = 0 + ?? 
? ?? ?? -?? = ?? + 1 
at ?? = 1 
? ?? ?? -1
= 2  
? ?? = 1 + ln2  
4. If ?? = ???? + 4 is a tangent to both the parabolas, ?? 2
= 4?? and ?? 2
= 2???? , then ?? is equal to
a. -64 b. -32
c. -128 d. 16
 
Answer: ( c) 
Page 3


                                           7
th
 January 2020 (Shift 1), Mathematics                                                        Page | 1  
 
Date: 7
th
 January 2020 (Shift 1) 
Time: 9:30 A.M. to 12:30 P.M. 
Subject: Mathematics 
 
1. The area of the region enclosed by the circle ?? 2
+ ?? 2
= 2 which is not common to the region 
bounded by the parabola ?? 2
= ?? and the straight line ?? = ?? , is 
a. 
1
12
( 24?? - 1) b. 
1
6
( 12?? - 1)
c. 
1
12
( 6?? - 1) d. 
1
12
( 12?? - 1) 
Answer: ( b) 
Solution: 
Required area = area of the circle – area bounded by given line and parabola 
    
Required area = ?? ?? 2
- ? ( ?? - ?? 2
) ????
1
0
 
Area = 2?? - (
?? 2
2
-
?? 3
3
)
0
1
= 2?? -
1
6
  sq. units 
 
2. If ?? ( ?? ) = ?? 2
+ ?? - 1 and ( ?????? ) ( ?? ) = 4?? 2
- 10?? + 5, then ?? (
5
4
) is 
a. 
1
2
 b. -
1
2
c. -
1
3
 d. 
1
3
 
Answer: ( b) 
Solution: 
?? ( ?? ) = ?? 2
+ ?? - 1  
                                           7
th
 January 2020 (Shift 1), Mathematics                                                        Page | 2  
 
?????? ( ?? ) = 4?? 2
- 10?? + 5 
?? ( ?? ( ?? ) ) = 4?? 2
- 10?? + 5 
?? 2
( ?? )+ ?? ( ?? )- 1 = 4?? 2
- 10?? + 5  
Putting ?? =
5
4
 & ?? (
5
4
) = ?? 
?? 2
+ ?? +
1
4
= 0 
?? = -
1
2
 
?? (
5
4
) = -
1
2
  
 
3. If ?? = ?? ( ?? ) is the solution of the differential equation ?? ?? (
????
????
- 1) = ?? ?? such that ?? ( 0) = 0, then 
?? ( 1) is equal to 
a. ln2 b. 2 + ln2
c. 1 + ln2 d. 3 + ln2
Answer: ( c) 
Solution: 
?? ?? ( ?? '
- 1) = ?? ?? 
?
????
????
= ?? ?? -?? + 1 
Let ?? - ?? = ?? 
      1 -
????
????
=
????
????
 
So, we can write  
? 1 -
????
????
= ?? ?? + 1 
? -?? -?? ???? = ???? 
? ?? -?? = ?? + ?? 
? ?? ?? -?? = ?? + ??  
1 = 0 + ?? 
? ?? ?? -?? = ?? + 1 
at ?? = 1 
? ?? ?? -1
= 2  
? ?? = 1 + ln2  
4. If ?? = ???? + 4 is a tangent to both the parabolas, ?? 2
= 4?? and ?? 2
= 2???? , then ?? is equal to
a. -64 b. -32
c. -128 d. 16
 
Answer: ( c) 
                                           7
th
 January 2020 (Shift 1), Mathematics                                                        Page | 3  
 
Solution: 
Any tangent to the parabola ?? 2
= 4?? is ?? = ???? +
?? ?? 
Comparing it with ?? = ???? + 4, we get 
1
?? = 4 ? ?? =
1
4
 
Equation of tangent becomes ?? =
?? 4
+ 4  
?? =
?? 4
+ 4 is a tangent to ?? 2
= 2????  
? ?? 2
= 2?? (
?? 4
+ 4)  
Or 2?? 2
- ???? - 16?? = 0, 
?? = 0  
?? 2
+ 128?? = 0, 
? ?? = 0 (not possible), 
     ?? = -128 
5. If ?? and ?? are two real roots of the equation ( ?? + 1)tan
2
?? - v 2 ?? tan?? = 1 - ?? , where ( ?? ? 1) 
and ?? are real numbers. If tan
2
( ?? + ?? ) = 50, then value of ?? is              
a. 10 b. 5
c. 7 d. 12 
Answer: ( a) 
Solution: 
( ?? + 1)tan
2
?? - v 2?? tan?? = 1 - ?? 
tan
2
( ?? + ?? )= 50 
Now,  
tan?? + tan?? =
v 2?? ?? + 1
, tan?? tan?? =
?? - 1
?? + 1
 
? (
v 2?? ?? + 1
1 -
?? - 1
?? + 1
)
2
= 50 
?
2?? 2
4
= 50 
? ?? 2
= 100 
? ?? = 10 
 
6. If the distance between the foci of an ellipse is 6 and the distance between its directrices is 12, then 
the length of its latus rectum is 
a. 4 
b. 3v 2
c. 9 
d. 2v 2
Page 4


                                           7
th
 January 2020 (Shift 1), Mathematics                                                        Page | 1  
 
Date: 7
th
 January 2020 (Shift 1) 
Time: 9:30 A.M. to 12:30 P.M. 
Subject: Mathematics 
 
1. The area of the region enclosed by the circle ?? 2
+ ?? 2
= 2 which is not common to the region 
bounded by the parabola ?? 2
= ?? and the straight line ?? = ?? , is 
a. 
1
12
( 24?? - 1) b. 
1
6
( 12?? - 1)
c. 
1
12
( 6?? - 1) d. 
1
12
( 12?? - 1) 
Answer: ( b) 
Solution: 
Required area = area of the circle – area bounded by given line and parabola 
    
Required area = ?? ?? 2
- ? ( ?? - ?? 2
) ????
1
0
 
Area = 2?? - (
?? 2
2
-
?? 3
3
)
0
1
= 2?? -
1
6
  sq. units 
 
2. If ?? ( ?? ) = ?? 2
+ ?? - 1 and ( ?????? ) ( ?? ) = 4?? 2
- 10?? + 5, then ?? (
5
4
) is 
a. 
1
2
 b. -
1
2
c. -
1
3
 d. 
1
3
 
Answer: ( b) 
Solution: 
?? ( ?? ) = ?? 2
+ ?? - 1  
                                           7
th
 January 2020 (Shift 1), Mathematics                                                        Page | 2  
 
?????? ( ?? ) = 4?? 2
- 10?? + 5 
?? ( ?? ( ?? ) ) = 4?? 2
- 10?? + 5 
?? 2
( ?? )+ ?? ( ?? )- 1 = 4?? 2
- 10?? + 5  
Putting ?? =
5
4
 & ?? (
5
4
) = ?? 
?? 2
+ ?? +
1
4
= 0 
?? = -
1
2
 
?? (
5
4
) = -
1
2
  
 
3. If ?? = ?? ( ?? ) is the solution of the differential equation ?? ?? (
????
????
- 1) = ?? ?? such that ?? ( 0) = 0, then 
?? ( 1) is equal to 
a. ln2 b. 2 + ln2
c. 1 + ln2 d. 3 + ln2
Answer: ( c) 
Solution: 
?? ?? ( ?? '
- 1) = ?? ?? 
?
????
????
= ?? ?? -?? + 1 
Let ?? - ?? = ?? 
      1 -
????
????
=
????
????
 
So, we can write  
? 1 -
????
????
= ?? ?? + 1 
? -?? -?? ???? = ???? 
? ?? -?? = ?? + ?? 
? ?? ?? -?? = ?? + ??  
1 = 0 + ?? 
? ?? ?? -?? = ?? + 1 
at ?? = 1 
? ?? ?? -1
= 2  
? ?? = 1 + ln2  
4. If ?? = ???? + 4 is a tangent to both the parabolas, ?? 2
= 4?? and ?? 2
= 2???? , then ?? is equal to
a. -64 b. -32
c. -128 d. 16
 
Answer: ( c) 
                                           7
th
 January 2020 (Shift 1), Mathematics                                                        Page | 3  
 
Solution: 
Any tangent to the parabola ?? 2
= 4?? is ?? = ???? +
?? ?? 
Comparing it with ?? = ???? + 4, we get 
1
?? = 4 ? ?? =
1
4
 
Equation of tangent becomes ?? =
?? 4
+ 4  
?? =
?? 4
+ 4 is a tangent to ?? 2
= 2????  
? ?? 2
= 2?? (
?? 4
+ 4)  
Or 2?? 2
- ???? - 16?? = 0, 
?? = 0  
?? 2
+ 128?? = 0, 
? ?? = 0 (not possible), 
     ?? = -128 
5. If ?? and ?? are two real roots of the equation ( ?? + 1)tan
2
?? - v 2 ?? tan?? = 1 - ?? , where ( ?? ? 1) 
and ?? are real numbers. If tan
2
( ?? + ?? ) = 50, then value of ?? is              
a. 10 b. 5
c. 7 d. 12 
Answer: ( a) 
Solution: 
( ?? + 1)tan
2
?? - v 2?? tan?? = 1 - ?? 
tan
2
( ?? + ?? )= 50 
Now,  
tan?? + tan?? =
v 2?? ?? + 1
, tan?? tan?? =
?? - 1
?? + 1
 
? (
v 2?? ?? + 1
1 -
?? - 1
?? + 1
)
2
= 50 
?
2?? 2
4
= 50 
? ?? 2
= 100 
? ?? = 10 
 
6. If the distance between the foci of an ellipse is 6 and the distance between its directrices is 12, then 
the length of its latus rectum is 
a. 4 
b. 3v 2
c. 9 
d. 2v 2
                                           7
th
 January 2020 (Shift 1), Mathematics                                                        Page | 4  
 
Answer: ( b) 
Solution: 
Let the equation of ellipse be 
?? 2
?? 2
+ 
?? 2
?? 2
= 1 ( ?? > ?? ) 
Now   2???? = 6  &  
2?? ?? = 12 
? ???? = 3  &   
?? ?? = 6 
? ?? 2
= 18    
? ?? 2
?? 2
= ?? 2
= ?? 2
- ?? 2
= 9  
? ?? 2
= 9 
Length of latus rectum =  
2?? 2
?? = 
2×9
v 18
 = 3v 2 
 
7. The logical statement ( ?? ? ?? )? ( ?? ?~ ?? ) is equivalent to 
a. ~ ?? b. ?? c.  ?? ? ?? d. ?? ? ??  
Answer: ( a) 
Solution: 
 
?? ?? ?? ? ?? ~ ?? ?? ?~ ?? ( ?? ? ?? )? ( ?? ?~ ?? ) 
       T        T                  T         F             F                       F 
       T        F              F         F             T                       F 
       F               T              T         T             T                       T 
       F        F              T         T             T                       T 
 
Clearly ( ?? ? ?? )? ( ?? ?~ ?? ) is equivalent to ~ ?? 
 
 
8. If the system of equations 
2?? + 2???? + ???? = 0  
2?? + 3???? + ???? = 0  
2?? + 4???? + ???? = 0,  
where ?? , ?? , ?? ? ?? are non-zero and distinct, has non zero solution then
a. ?? + ?? + ?? = 0 b. ?? , ?? , ?? are in A.P
c. 
1
?? ,
1
?? ,
1
?? are in A.P 
d. ?? , ?? , ?? are in G.P
Answer: ( c) 
Solution: 
 
Page 5


                                           7
th
 January 2020 (Shift 1), Mathematics                                                        Page | 1  
 
Date: 7
th
 January 2020 (Shift 1) 
Time: 9:30 A.M. to 12:30 P.M. 
Subject: Mathematics 
 
1. The area of the region enclosed by the circle ?? 2
+ ?? 2
= 2 which is not common to the region 
bounded by the parabola ?? 2
= ?? and the straight line ?? = ?? , is 
a. 
1
12
( 24?? - 1) b. 
1
6
( 12?? - 1)
c. 
1
12
( 6?? - 1) d. 
1
12
( 12?? - 1) 
Answer: ( b) 
Solution: 
Required area = area of the circle – area bounded by given line and parabola 
    
Required area = ?? ?? 2
- ? ( ?? - ?? 2
) ????
1
0
 
Area = 2?? - (
?? 2
2
-
?? 3
3
)
0
1
= 2?? -
1
6
  sq. units 
 
2. If ?? ( ?? ) = ?? 2
+ ?? - 1 and ( ?????? ) ( ?? ) = 4?? 2
- 10?? + 5, then ?? (
5
4
) is 
a. 
1
2
 b. -
1
2
c. -
1
3
 d. 
1
3
 
Answer: ( b) 
Solution: 
?? ( ?? ) = ?? 2
+ ?? - 1  
                                           7
th
 January 2020 (Shift 1), Mathematics                                                        Page | 2  
 
?????? ( ?? ) = 4?? 2
- 10?? + 5 
?? ( ?? ( ?? ) ) = 4?? 2
- 10?? + 5 
?? 2
( ?? )+ ?? ( ?? )- 1 = 4?? 2
- 10?? + 5  
Putting ?? =
5
4
 & ?? (
5
4
) = ?? 
?? 2
+ ?? +
1
4
= 0 
?? = -
1
2
 
?? (
5
4
) = -
1
2
  
 
3. If ?? = ?? ( ?? ) is the solution of the differential equation ?? ?? (
????
????
- 1) = ?? ?? such that ?? ( 0) = 0, then 
?? ( 1) is equal to 
a. ln2 b. 2 + ln2
c. 1 + ln2 d. 3 + ln2
Answer: ( c) 
Solution: 
?? ?? ( ?? '
- 1) = ?? ?? 
?
????
????
= ?? ?? -?? + 1 
Let ?? - ?? = ?? 
      1 -
????
????
=
????
????
 
So, we can write  
? 1 -
????
????
= ?? ?? + 1 
? -?? -?? ???? = ???? 
? ?? -?? = ?? + ?? 
? ?? ?? -?? = ?? + ??  
1 = 0 + ?? 
? ?? ?? -?? = ?? + 1 
at ?? = 1 
? ?? ?? -1
= 2  
? ?? = 1 + ln2  
4. If ?? = ???? + 4 is a tangent to both the parabolas, ?? 2
= 4?? and ?? 2
= 2???? , then ?? is equal to
a. -64 b. -32
c. -128 d. 16
 
Answer: ( c) 
                                           7
th
 January 2020 (Shift 1), Mathematics                                                        Page | 3  
 
Solution: 
Any tangent to the parabola ?? 2
= 4?? is ?? = ???? +
?? ?? 
Comparing it with ?? = ???? + 4, we get 
1
?? = 4 ? ?? =
1
4
 
Equation of tangent becomes ?? =
?? 4
+ 4  
?? =
?? 4
+ 4 is a tangent to ?? 2
= 2????  
? ?? 2
= 2?? (
?? 4
+ 4)  
Or 2?? 2
- ???? - 16?? = 0, 
?? = 0  
?? 2
+ 128?? = 0, 
? ?? = 0 (not possible), 
     ?? = -128 
5. If ?? and ?? are two real roots of the equation ( ?? + 1)tan
2
?? - v 2 ?? tan?? = 1 - ?? , where ( ?? ? 1) 
and ?? are real numbers. If tan
2
( ?? + ?? ) = 50, then value of ?? is              
a. 10 b. 5
c. 7 d. 12 
Answer: ( a) 
Solution: 
( ?? + 1)tan
2
?? - v 2?? tan?? = 1 - ?? 
tan
2
( ?? + ?? )= 50 
Now,  
tan?? + tan?? =
v 2?? ?? + 1
, tan?? tan?? =
?? - 1
?? + 1
 
? (
v 2?? ?? + 1
1 -
?? - 1
?? + 1
)
2
= 50 
?
2?? 2
4
= 50 
? ?? 2
= 100 
? ?? = 10 
 
6. If the distance between the foci of an ellipse is 6 and the distance between its directrices is 12, then 
the length of its latus rectum is 
a. 4 
b. 3v 2
c. 9 
d. 2v 2
                                           7
th
 January 2020 (Shift 1), Mathematics                                                        Page | 4  
 
Answer: ( b) 
Solution: 
Let the equation of ellipse be 
?? 2
?? 2
+ 
?? 2
?? 2
= 1 ( ?? > ?? ) 
Now   2???? = 6  &  
2?? ?? = 12 
? ???? = 3  &   
?? ?? = 6 
? ?? 2
= 18    
? ?? 2
?? 2
= ?? 2
= ?? 2
- ?? 2
= 9  
? ?? 2
= 9 
Length of latus rectum =  
2?? 2
?? = 
2×9
v 18
 = 3v 2 
 
7. The logical statement ( ?? ? ?? )? ( ?? ?~ ?? ) is equivalent to 
a. ~ ?? b. ?? c.  ?? ? ?? d. ?? ? ??  
Answer: ( a) 
Solution: 
 
?? ?? ?? ? ?? ~ ?? ?? ?~ ?? ( ?? ? ?? )? ( ?? ?~ ?? ) 
       T        T                  T         F             F                       F 
       T        F              F         F             T                       F 
       F               T              T         T             T                       T 
       F        F              T         T             T                       T 
 
Clearly ( ?? ? ?? )? ( ?? ?~ ?? ) is equivalent to ~ ?? 
 
 
8. If the system of equations 
2?? + 2???? + ???? = 0  
2?? + 3???? + ???? = 0  
2?? + 4???? + ???? = 0,  
where ?? , ?? , ?? ? ?? are non-zero and distinct, has non zero solution then
a. ?? + ?? + ?? = 0 b. ?? , ?? , ?? are in A.P
c. 
1
?? ,
1
?? ,
1
?? are in A.P 
d. ?? , ?? , ?? are in G.P
Answer: ( c) 
Solution: 
 
                                                                                                           
                                            7
th
 January 2020 (Shift 1), Mathematics                                                          Page | 5  
 
 
 |
2 2?? ?? 2 3?? ?? 2 4?? ?? | = 0 
 ?? 2
? ?? 2
- ?? 1
, ?? 3
? ?? 3
- ?? 1
 
? |
2 2?? ?? 0 3?? - 2?? ?? - ?? 0 4?? - 2?? ?? - ?? | = 0 
      ? ( 3?? - 2?? ) ( ?? - ?? )- ( 4?? - 2?? ) ( ?? - ?? ) = 0 
  ? 3???? - 2???? - 3???? + 2?? 2
- [4???? - 4???? - 2???? + 2?? 2
] = 0 
  ? -???? + 2???? - ???? = 0 
  ? ???? + ???? = 2???? 
  ?
1
?? +
1
?? =
2
?? 
 
9. 5 numbers are in A.P whose sum is 25 and product is 2520. If one of these 5 numbers is -
1
2
, then the 
greatest number amongst them is 
a. 
21
2
 
b. 16
c. 27 d. 7
Answer: ( b) 
Solution: 
Let 5 numbers be ?? - 2?? , ?? - ?? , ?? , ?? + ?? , ?? + 2??  
5?? = 25  
?? = 5  
( ?? - 2?? ) ( ?? - ?? ) ?? ( ?? + ?? ) ( ?? + 2?? ) = 2520  
( 25 - 4?? 2
) ( 25 - ?? 2
) = 504  
4?? 4
- 125?? 2
+ 121 = 0  
4?? 4
- 4?? 2
- 121 ?? 2
+ 121 = 0  
?? 2
= 1 ???? ?? 2
=
121
4
  
?? = ±
11
2
  
For ?? =
11
2
, ?? + 2?? is the greatest term, ?? + 2?? = 5 + 11 = 16 
 
10. If ?? is a root of the equation ?? 2
+ ?? + 1 = 0 and ?? =
1
v 3
[
1 1 1
1 ?? ?? 2
1 ?? 2
?? ] then ?? 31
 equal to 
a. ?? b. ?? 2
c. ?? 3
 d. ?? 4
Answer: ( ?? ) 
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FAQs on JEE Main 2020 January 7 Question Paper Shift 1 - JEE Main & Advanced Previous Year Papers

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