Exam Paper Solutions

# JEE Main 2021 Question Paper with Solutions- 24 Feb P2

JEE Main is one of the toughest exams in whole world. Get here solutions to that exam questions for absolutely free.

10 minutes long
Posted by Mahak Jain, 17/3/2021

Hesap Oluştur

Got stuck on homework? Get your step-by-step solutions from real tutors in minutes! 24/7. Unlimited.

Attempting question papers is best way to practice. In this blog you have JEE Main 2021 question paper with solutions for 24th February shift 1.

In this blog we provide you JEE Main 2021 question paper with solutions for free. Here at Kunduz we aim to provide quality solutions from best tutors at Kunduz. These solutions for JEE Main 2021 question paper are prepared by Kunduz tutors.

## Important Material for JEE Aspirants

Must read JEE Mains chapter wise weightage

NCERT Books – Best Ways to Study

## JEE Main 2021 Question Paper with Solutions- 24 February Shift 1

### Physics

#### Question 1

Two electrons are fixed at a separation of 2d from each other. A proton is placed at the midpoint and displaced slightly in a direction perpendicular to line joining the two electrons. Find the frequency of oscillation of proton.

1. f = (1/2π)×√(2ke2/md3)

2. f = (1/2π)×√(ke2/md3)

3. f = (1/2π)×√(ke2/2md3)

4. None of these

#### Question 2

The weight of a person on pole is 48 kg then the weight on equator is?

Given [R = 6400 km]

1. 48
2. 48.83
3. 47.84
4. 47

#### Question 3

Two bodies A & B have masses 1 kg & 2 kg respectively have equal momentum. Find the ratio of kinetic energy?

1. 1: 1
2. 2: 1
3. 1: 4
4. 1: 2

#### Question 4

Which transition in hydrogen spectrum has the maxima frequency?

1. 3 ➝ 2
2. 5 ➝ 4
3. 9 ➝ 5
4. 2 ➝ 1

#### Question 5

A rod of mass M, length L is bent in the form of hexagon. Then MOI about axis passing through geometric centre & perpendicular to plane of body will be ?

1. 6ML2
2. ML2/6
3. ML2/2
4. 5ML2/216

#### Question 6

Find the time period of SHM of the block of mass M.

1. T = 2π√(M/2K)

2. T = 2π√(M/K)

3. T = 2π√(2M/2)

4. T = 2π√(M/4K)

#### Question 7

A particle is projected on x axis with velocity v. A force is acting on it in opposite direction , which is proportional to the square of its position. At what distance from origin the particle will stop. [mass is m and constant of proportionality → k]

1. ∛(mvo2/k)
2. ∛(3mvo2/k)
3. ∛(3mvo2/2k)
4. ∛(mvo2/2k)

#### Question 8

Two cars are approaching each other each moving with a speed v. Find the beat frequency as heard by driver of one car both are emitting sound of frequency of.

1. Beat frequency = 2vfo/(C-v)

2. Beat frequency = 2vfo/(C+v)

3. Beat frequency = vfo/(C-v)

4. None of these

#### Question 9

Find the flux of point charge ‘q’ through the square surface ABCD as shown

1. q/6∊o
2. q/∊o
3. q/4∊o
4. q/2∊o

#### Question 10

If a solid cavity whose diameter is removed from a solid sphere of radius R, then the com of remaining part is at?

1. x = -R/3

2. x = -R/7

3. x = -R/6

4. x = -R/14

#### Question 11

In a YDSE experiment, if Red light is replaced by violet light then the fringe width will be

1. decrease
2. increase
3. may increase or decrease
4. None of these

#### Question 12

The graph of V versus x in an SHM is (v : velocity, x : displacement)

1.

2.

3.

4.

#### Question 13

If the de Broglie wavelengths of an alpha particle and a proton are the same, then the ratio of their velocities is:

1. 1/4
2. 4
3. 1/2
4. 1

#### Question 14

Find the current through the battery just after the key is closed.

1. 9/4 A
2. 9/2 A
3. 9 A
4. None of these

## JEE Main Frequently Asked Questions (FAQs)

Question 1: When is JEE mains 2021 exams?

Answer: National Testing Agency has announced dates for all phases of JEE Mains. First phase is in February 2021 (23, 24, 25 and 26). Second phase is in March 2021 (15, 16, 17 & 18) , third in April 2021 (27, 28, 29 & 30) and fourth in May 2021 (24, 25, 26, 27 & 28). To get more details about JEE Main click here.

Question 2: Can I challenge JEE Mains 2021 answer key? How?

Answer: Yes, candidates who have objection to the answer key given by National Testing Agency can go to jeemain.nta.nic.in , from where they can challenge answer key.

Question 3: Does National Testing Agency refund JEE Mains 2021 answer key fees.

Answer: Yes, National Testing Agency refund fees if objection is found valid with proper supporting documents.

Question 4: Who will conduct JEE Mains 2021 Counseling?

Answer: Joint Seat Allocation Authority (JoSAA) is responsible for counseling of JEE Main 2021 qualified students.

## Importance of Doubt Clearing with Solving JEE Main Question Paper

The more questions you solve, the better your JEE Score! You can see best questions asked for JEE inside the app which gets updated daily with 1000+ questions. You can always take help from Kunduz which will help you when you are stuck in between and need some help from topmost tutors from IITs!  We will update you with such blog posts. So, keep checking this space.  Stay awesome, Keep Learning!?

## Why Study with Kunduz?

• Get personalized solutions & answers to all questions.
• Doubts are solved in 15 mins by our doubt solving expert teachers
• Chat with our tutors like private tutoring to get your doubts cleared.
• Doubt solving experts available 24*7.
• Do not stand in a queue at a doubt corner to get your doubts solved.
• Save hours exploring online to find solutions to your doubts.
• Do your own revision using the Kunduz Question bank that is free.
• Revise with questions and solutions asked by other students preparing for JEE / NEET from our question bank.