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 Page 1


 
 
 
PHYSICS 
 
1. An infinitely long straight conductor carries a current of 5?? as shown. An electron is moving with a speed of 10
5
m/s 
parallel to the conductor. The perpendicular distance between the electron and the conductor is 20cm at an instant. 
Calculate the magnitude of the force experienced by the electron at that instant. 
 
(1) 4× 10
-20
N 
(2) 8?? × 10
-20
N 
(3) 4?? × 10
-20
N 
(4) 8× 10
-20
N 
Correct Answer: (4) 
Q.1. Solution: 
M.F due to long current carrying wire at 20 cm , 
?? =
?? 0
?? 2????
 
?? =
2× 10
-7
× 5
20× 10
-2
 
?? = 0.5 × 10
-5
 T 
Now, 
Force experienced by electron = ?? V?? 
?? ?? = ?????? 
Page 2


 
 
 
PHYSICS 
 
1. An infinitely long straight conductor carries a current of 5?? as shown. An electron is moving with a speed of 10
5
m/s 
parallel to the conductor. The perpendicular distance between the electron and the conductor is 20cm at an instant. 
Calculate the magnitude of the force experienced by the electron at that instant. 
 
(1) 4× 10
-20
N 
(2) 8?? × 10
-20
N 
(3) 4?? × 10
-20
N 
(4) 8× 10
-20
N 
Correct Answer: (4) 
Q.1. Solution: 
M.F due to long current carrying wire at 20 cm , 
?? =
?? 0
?? 2????
 
?? =
2× 10
-7
× 5
20× 10
-2
 
?? = 0.5 × 10
-5
 T 
Now, 
Force experienced by electron = ?? V?? 
?? ?? = ?????? 
 
 
?? ?? = 1.6× 10
-19
× 10
5
× 0.5 × 10
-5
 
= 8 × 10
-20
 N 
 
2. A body is executing simple harmonic motion with frequency 'n', the frequency of its potential energy is: 
(1) n 
(2) 2?? 
(3) 3n 
(4) 4n 
Correct Answer: (2) 
Q.2. Solution: 
Given, 
frequency of SIHM = ?? 
as we know, 
? In one time period ???? become maximum & minimum two time  
So, 
It means frequency of ????  is 2?? . 
 
3. A radioactive nucleus 
?? A
X undergoes spontaneous decay in the sequence 
Z
A
X ?
Z-1
B ?
Z-3
C ?
Z-2
D where 
 Z  is the atomic number of element X. The possible decay particles in the sequence are: 
(1) ?? ,?? -
,?? +
 
(2) ?? ,?? +
,?? -
 
(3) ?? +
,?? ,?? -
 
(4) ?? -
,?? ,?? +
 
Correct Answer: (3) 
Q.3. Solution: 
As we know due to ?? -decay atomic number decreases by 2 and mass number decreases by 4. Due to ?? -
decay 
mass number remains unchange and atomic number increases by 1. 
Due to  ?? +
 decay mass number remains unchange but atomic number decreares by 1.  
Page 3


 
 
 
PHYSICS 
 
1. An infinitely long straight conductor carries a current of 5?? as shown. An electron is moving with a speed of 10
5
m/s 
parallel to the conductor. The perpendicular distance between the electron and the conductor is 20cm at an instant. 
Calculate the magnitude of the force experienced by the electron at that instant. 
 
(1) 4× 10
-20
N 
(2) 8?? × 10
-20
N 
(3) 4?? × 10
-20
N 
(4) 8× 10
-20
N 
Correct Answer: (4) 
Q.1. Solution: 
M.F due to long current carrying wire at 20 cm , 
?? =
?? 0
?? 2????
 
?? =
2× 10
-7
× 5
20× 10
-2
 
?? = 0.5 × 10
-5
 T 
Now, 
Force experienced by electron = ?? V?? 
?? ?? = ?????? 
 
 
?? ?? = 1.6× 10
-19
× 10
5
× 0.5 × 10
-5
 
= 8 × 10
-20
 N 
 
2. A body is executing simple harmonic motion with frequency 'n', the frequency of its potential energy is: 
(1) n 
(2) 2?? 
(3) 3n 
(4) 4n 
Correct Answer: (2) 
Q.2. Solution: 
Given, 
frequency of SIHM = ?? 
as we know, 
? In one time period ???? become maximum & minimum two time  
So, 
It means frequency of ????  is 2?? . 
 
3. A radioactive nucleus 
?? A
X undergoes spontaneous decay in the sequence 
Z
A
X ?
Z-1
B ?
Z-3
C ?
Z-2
D where 
 Z  is the atomic number of element X. The possible decay particles in the sequence are: 
(1) ?? ,?? -
,?? +
 
(2) ?? ,?? +
,?? -
 
(3) ?? +
,?? ,?? -
 
(4) ?? -
,?? ,?? +
 
Correct Answer: (3) 
Q.3. Solution: 
As we know due to ?? -decay atomic number decreases by 2 and mass number decreases by 4. Due to ?? -
decay 
mass number remains unchange and atomic number increases by 1. 
Due to  ?? +
 decay mass number remains unchange but atomic number decreares by 1.  
 
 
So, option (3) is correct option. 
 
4. The escape velocity from the Earth's surface is ?? . The escape velocity from the surface of another planet having a 
radius, four times that of Earth and same mass density is : 
(1) ?? 
(2) 2?? 
(3) 3?? 
(4) 4?? 
Correct Answer: (4) 
Q.4. Solution: 
As we know escape velocity is given by, 
?? ?? = v2???? =
v
2???? 4
3
?? ?? 3
4
3
?? ?? 2
=
v
2???? ?? 4
3
?? ?? 2
 
?? ?? ?
v
?? 2
? ?? 
Escape velocity from Earth’s surface = ?? 
Escape velocity from surface of another planet =? 
?? ???????????? = 4?? ???????? h
 
?? ???????????? = ?? ???????? h
 
So we can write , 
(?? ?? )
earth 
(?? ?? ) planet 
=
 ?? ???????? h
 
?? ???????????? =
?? 4?? =
1
4
 
It means, 
(?? ?? )
earth 
= (?? ?? )
Planet
 
 
(?? ?? )
Planet
 
= 4?? 
 
Page 4


 
 
 
PHYSICS 
 
1. An infinitely long straight conductor carries a current of 5?? as shown. An electron is moving with a speed of 10
5
m/s 
parallel to the conductor. The perpendicular distance between the electron and the conductor is 20cm at an instant. 
Calculate the magnitude of the force experienced by the electron at that instant. 
 
(1) 4× 10
-20
N 
(2) 8?? × 10
-20
N 
(3) 4?? × 10
-20
N 
(4) 8× 10
-20
N 
Correct Answer: (4) 
Q.1. Solution: 
M.F due to long current carrying wire at 20 cm , 
?? =
?? 0
?? 2????
 
?? =
2× 10
-7
× 5
20× 10
-2
 
?? = 0.5 × 10
-5
 T 
Now, 
Force experienced by electron = ?? V?? 
?? ?? = ?????? 
 
 
?? ?? = 1.6× 10
-19
× 10
5
× 0.5 × 10
-5
 
= 8 × 10
-20
 N 
 
2. A body is executing simple harmonic motion with frequency 'n', the frequency of its potential energy is: 
(1) n 
(2) 2?? 
(3) 3n 
(4) 4n 
Correct Answer: (2) 
Q.2. Solution: 
Given, 
frequency of SIHM = ?? 
as we know, 
? In one time period ???? become maximum & minimum two time  
So, 
It means frequency of ????  is 2?? . 
 
3. A radioactive nucleus 
?? A
X undergoes spontaneous decay in the sequence 
Z
A
X ?
Z-1
B ?
Z-3
C ?
Z-2
D where 
 Z  is the atomic number of element X. The possible decay particles in the sequence are: 
(1) ?? ,?? -
,?? +
 
(2) ?? ,?? +
,?? -
 
(3) ?? +
,?? ,?? -
 
(4) ?? -
,?? ,?? +
 
Correct Answer: (3) 
Q.3. Solution: 
As we know due to ?? -decay atomic number decreases by 2 and mass number decreases by 4. Due to ?? -
decay 
mass number remains unchange and atomic number increases by 1. 
Due to  ?? +
 decay mass number remains unchange but atomic number decreares by 1.  
 
 
So, option (3) is correct option. 
 
4. The escape velocity from the Earth's surface is ?? . The escape velocity from the surface of another planet having a 
radius, four times that of Earth and same mass density is : 
(1) ?? 
(2) 2?? 
(3) 3?? 
(4) 4?? 
Correct Answer: (4) 
Q.4. Solution: 
As we know escape velocity is given by, 
?? ?? = v2???? =
v
2???? 4
3
?? ?? 3
4
3
?? ?? 2
=
v
2???? ?? 4
3
?? ?? 2
 
?? ?? ?
v
?? 2
? ?? 
Escape velocity from Earth’s surface = ?? 
Escape velocity from surface of another planet =? 
?? ???????????? = 4?? ???????? h
 
?? ???????????? = ?? ???????? h
 
So we can write , 
(?? ?? )
earth 
(?? ?? ) planet 
=
 ?? ???????? h
 
?? ???????????? =
?? 4?? =
1
4
 
It means, 
(?? ?? )
earth 
= (?? ?? )
Planet
 
 
(?? ?? )
Planet
 
= 4?? 
 
 
 
5. The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours 
would be : 
(1) 1/2 
(2) 
1
2v2
 
(3) 
2
3
 
(4) 
2
3v2
 
Correct Answer: (2) 
Q.5. Solution: 
Given, 
?? 1
2
= 100 hours 
?? = 150 hours 
? no. of nuclide remain after ?? half life, ?? =
?? 0
2
?? 
? 100 hours = 1 half life 
 150 hours =
1
100
× 150 
=
3
2
 half life 
So, Fraction Remain after 
3
2
 half life 
?? ?? 0
= (
1
2
)
3/2
=
1
2v2
  
 
6. A convex lens 'A' of focal length 20cm and a concave lens ' ?? ' of focal length 5cm are kept along the same axis with a 
distance 'd' between them. If a parallel beam of light falling on 'A' leaves 'B' as a parallel beam, then the distance 'd' in cm 
will be : 
(1) 25 
(2) 15 
(3) 50 
(4) 30 
Page 5


 
 
 
PHYSICS 
 
1. An infinitely long straight conductor carries a current of 5?? as shown. An electron is moving with a speed of 10
5
m/s 
parallel to the conductor. The perpendicular distance between the electron and the conductor is 20cm at an instant. 
Calculate the magnitude of the force experienced by the electron at that instant. 
 
(1) 4× 10
-20
N 
(2) 8?? × 10
-20
N 
(3) 4?? × 10
-20
N 
(4) 8× 10
-20
N 
Correct Answer: (4) 
Q.1. Solution: 
M.F due to long current carrying wire at 20 cm , 
?? =
?? 0
?? 2????
 
?? =
2× 10
-7
× 5
20× 10
-2
 
?? = 0.5 × 10
-5
 T 
Now, 
Force experienced by electron = ?? V?? 
?? ?? = ?????? 
 
 
?? ?? = 1.6× 10
-19
× 10
5
× 0.5 × 10
-5
 
= 8 × 10
-20
 N 
 
2. A body is executing simple harmonic motion with frequency 'n', the frequency of its potential energy is: 
(1) n 
(2) 2?? 
(3) 3n 
(4) 4n 
Correct Answer: (2) 
Q.2. Solution: 
Given, 
frequency of SIHM = ?? 
as we know, 
? In one time period ???? become maximum & minimum two time  
So, 
It means frequency of ????  is 2?? . 
 
3. A radioactive nucleus 
?? A
X undergoes spontaneous decay in the sequence 
Z
A
X ?
Z-1
B ?
Z-3
C ?
Z-2
D where 
 Z  is the atomic number of element X. The possible decay particles in the sequence are: 
(1) ?? ,?? -
,?? +
 
(2) ?? ,?? +
,?? -
 
(3) ?? +
,?? ,?? -
 
(4) ?? -
,?? ,?? +
 
Correct Answer: (3) 
Q.3. Solution: 
As we know due to ?? -decay atomic number decreases by 2 and mass number decreases by 4. Due to ?? -
decay 
mass number remains unchange and atomic number increases by 1. 
Due to  ?? +
 decay mass number remains unchange but atomic number decreares by 1.  
 
 
So, option (3) is correct option. 
 
4. The escape velocity from the Earth's surface is ?? . The escape velocity from the surface of another planet having a 
radius, four times that of Earth and same mass density is : 
(1) ?? 
(2) 2?? 
(3) 3?? 
(4) 4?? 
Correct Answer: (4) 
Q.4. Solution: 
As we know escape velocity is given by, 
?? ?? = v2???? =
v
2???? 4
3
?? ?? 3
4
3
?? ?? 2
=
v
2???? ?? 4
3
?? ?? 2
 
?? ?? ?
v
?? 2
? ?? 
Escape velocity from Earth’s surface = ?? 
Escape velocity from surface of another planet =? 
?? ???????????? = 4?? ???????? h
 
?? ???????????? = ?? ???????? h
 
So we can write , 
(?? ?? )
earth 
(?? ?? ) planet 
=
 ?? ???????? h
 
?? ???????????? =
?? 4?? =
1
4
 
It means, 
(?? ?? )
earth 
= (?? ?? )
Planet
 
 
(?? ?? )
Planet
 
= 4?? 
 
 
 
5. The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours 
would be : 
(1) 1/2 
(2) 
1
2v2
 
(3) 
2
3
 
(4) 
2
3v2
 
Correct Answer: (2) 
Q.5. Solution: 
Given, 
?? 1
2
= 100 hours 
?? = 150 hours 
? no. of nuclide remain after ?? half life, ?? =
?? 0
2
?? 
? 100 hours = 1 half life 
 150 hours =
1
100
× 150 
=
3
2
 half life 
So, Fraction Remain after 
3
2
 half life 
?? ?? 0
= (
1
2
)
3/2
=
1
2v2
  
 
6. A convex lens 'A' of focal length 20cm and a concave lens ' ?? ' of focal length 5cm are kept along the same axis with a 
distance 'd' between them. If a parallel beam of light falling on 'A' leaves 'B' as a parallel beam, then the distance 'd' in cm 
will be : 
(1) 25 
(2) 15 
(3) 50 
(4) 30 
 
 
Correct Answer: (1) 
Q.6. Solution: 
 
Total distance = ?? 1
+ ?? 2
 
= 25 ????  
 
7. A capacitor of capacitance '?? ', is connected across an ac source of voltage ?? , given by V = V
0
sin ?? t The displacement 
current between the plates of the capacitor, would then be given by: 
(1) I
d
= V
0
?? Ccos?? t 
(2) I
d
=
V
0
?? C
cos ?? t 
(3) ?? ?? =
?? 0
????
sin ???? 
 (4) I
d
= V
0
?? Csin ?? t 
Correct Answer: (1) 
Q.7. Solution: 
?  ?? = ????  
And ?? = ?? 0
sin???? 
?? ?? =?  
As we know, 
?  ?? ?? = ?? 0
?? Ø
????
  
= ?? 0
??????
????
    (?  ?? =
?? ?? ) 
=
?? 0
?? ????
?? ????
  
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FAQs on NEET 2021 Past Year Paper with Detailed Solutions - NEET Past Year Papers

1. What is NEET and why is it important for aspiring medical students?
Ans.NEET, or the National Eligibility cum Entrance Test, is a standardized entrance exam in India for students aspiring to pursue undergraduate medical courses. It is crucial because it serves as a common gateway for admission into medical and dental colleges, ensuring that students are assessed on a uniform basis, which enhances the selection process for quality education in the medical field.
2. What subjects are included in the NEET examination?
Ans.The NEET examination comprises three main subjects: Physics, Chemistry, and Biology (which includes both Botany and Zoology). These subjects are essential as they form the foundation of medical education, and the exam tests students' knowledge and understanding in these areas.
3. How is the NEET exam structured in terms of question format and scoring?
Ans.NEET consists of multiple-choice questions (MCQs) where each question has four options. The total number of questions is typically 180, with 45 questions from Physics, 45 from Chemistry, and 90 from Biology. Each correct answer awards a specific number of points, while incorrect answers may result in a negative marking, making it important for students to answer carefully.
4. What is the significance of solving past year papers for NEET preparation?
Ans.Solving past year papers is significant for NEET preparation as it helps students understand the exam pattern, the types of questions asked, and the level of difficulty. It also aids in time management skills, boosts confidence, and allows students to identify their strengths and weaknesses in various subjects.
5. What are some effective study strategies for succeeding in the NEET exam?
Ans.Effective study strategies for succeeding in NEET include creating a structured study schedule, focusing on understanding concepts rather than rote memorization, practicing with mock tests and previous year papers, and revising regularly. Additionally, seeking guidance from teachers or mentors and joining coaching classes can provide valuable insights and support in the preparation process.
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