JEE Main DPP 20 November 2024: Daily practice problems for 2025 aspirants

JEE Main DPP 20 November 2024

JEE Main DPP 20 November 2024: JEE Main Session 1 2025 will take place from January 22 to 31. Applicants preparing for the exam must focus on practising the JEE Main sample papers. Hence, here are some daily practice questions with answers for JEE Main DPP 20 November 2024, including five questions from each subject: Mathematics, Physics, and Chemistry.

Also Read | NEET Daily Practice Questions 20 November 2024: DPP for 2025 aspirants

JEE Main DPP 20 November 2024: Physics

Candidates can check out the JEE Main DPP 20 November 2024 daily practice problems for 2025 aspirants from the Physics section:

Question 1: A microscope is focused on an object at the bottom of a bucket. If liquid with refractive index   5/3 is poured inside the bucket, then the microscope has to be raised by 30 cm to focus the object again. The height of the liquid in the bucket is

(1) 12 cm

(2) 18 cm

(3) 75 cm

(4) 50 cm

Answer (3)

Question 2: If the two metals A and B are exposed to radiation of wavelength 350 nm. The work functions of metals A and B are 4.8 eV and 2.2 eV. Then choose the correct option.

(1) Metals B will not emit photo-electrons

(2)  Both metals A and B will not emit photo- electrons

(3)  Both metals A and B will emit photo-electrons

(4)  Metals A will not emit photo-electrons

Answer (4)

Question 3: A body of mass 10 kg is moving with an initial speed of 20 m/s. The body stops after 5 s due to friction between body and the floor. The value of the coefficient of friction is (Take acceleration due to gravity g = ms–2)

(1) 0.2

(2) 0.4

(3) 0.3

(4) 0.5

Answer (2)

Question 4: Under the same load, wire A having length 5.0 m and cross-section 2.5 × 10–5 m2 stretches uniformly by the same amount as another wire B of length 6.0 m and a cross-section of 3.0 × 10–5 m2 stretches. The ratio of the Young’s modulus of wire A to that of wire B will be

(1) 1 : 4

(2) 1 : 2

(3) 1 : 10

(4) 1 : 1

Answer (4)

Question 5: A hypothetical gas expands adiabatically such that its volume changes from 08 litres to 27 litres. If the ratio of final pressure of the gas to initial pressure of the gas is 16/81. Then the ratio of Cp/Cv

(1) 4/3

(2)  1/2

(3)   3/2

(4)   1/3

Answer (1)

JEE Main DPP 20 November 2024: Chemistry

Candidates can check out the JEE Main DPP 20 November 2024 daily practice problems for 2025 aspirants from the Chemistry section:

Question 1: Given below are two statements:

Statement I : Upon heating a borax bead dipped in cupric sulphate in a luminous flame, the colour of the bead becomes green.

Statement II: The green colour observed is due to the formation of copper(I) metaborate.

In the light of the above statements, choose the most appropriate answer from the options given below.

(1)  Statement I is false but Statement II is true

(2)  Statement I is true but Statement II is false

(3)  Both Statement I and Statement II are false

(4)  Both Statement I and Statement II are true

Answer (3)

Question 2: The element playing significant role in neuromuscular function and interneuronal transmission is

(1)  Li

(2) Mg

(3) Ca

(4) Be

Answer (3)

Question 3: Arrange the following orbitals in decreasing order of energy.

A. n = 3, l = 0, m = 0

B. n = 4, l = 0, m = 0

C. n = 3, l = 1, m = 0

D. n = 3, l = 2, m = 1

The correct option for the order is

(1) A > C > B > D

(2) B > D > C > A

(3) D > B > A > C

(4) D > B > C > A

Answer (4)

Question 4: Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): The first ionization enthalpy of 3d series elements is more than that of group 2 metals.

Reason (R): In 3d series of elements successive filling of d-orbitals takes place.

In the light of the above statements, choose the correct answer from the options given below.

(1) (A) is true but (R) is false

(2)  Both (A) and (R) are true and (R) is the correct explanation of (A)

(3)  (A) is false but (R) is true

(4)  Both (A) and (R) are true but (R) is not the correct explanation of (A)

Answer (2)

Question 5 : Evaluate the following statements for their correctness.

A.  The elevation in boiling point temperature of water will be the same for 0.1 M NaCI and 0.1 M urea.

B.   Azeotropic mixture boils without change in their composition.

C.   Osmosis always takes place from hypertonic to hypotonic solution.

D.   The density of 32%  H2SO4    solution having molarity 4.09 M is approximately 1.26 g mL–1.

E.   A negatively charged sol is obtained when KI solution is added to silver nitrate solution.

Choose the correct answer from the options given below.

(1) A and C only

(2) B, D and E only

(3) A, B and D only

(4) B and D only

Answer (4)

JEE Main DPP 20 November 2024: Mathematics

Candidates can check out the JEE Main DPP 20 November 2024 daily practice problems for 2025 aspirants from Maths section:

Problem 1: Let the mean and standard deviation of marks of class A of 100 students be respectively 40 and k (>0), and the mean and standard deviation of marks of class B of n students are respectively 55 and 30 – k. If the mean and variance of the marks of the combined class of 100 + n students are respectively 50 and 350, then the sum of variances of classes A and B is :

(1) 450

(2) 650

(3) 900

(4) 500

Solution (4)

Problem 2: Let P be the plane, passing through the point (1, -1, -5) and perpendicular to the line joining the points (4,1, -3) and (2, 4, 3). Then the distance of P from the point (3, -2, 2) is

(1)   4

(2)  7

(3)  5

(4)  6

Solution (3)

Problem 3: Let A be the event that the absolute difference between two randomly chosen real numbers in the sample space [0, 60] is less than or equal to a. If P (A) = 11/36 , then a is equal to

(1) 10

(2) 15

(3) 20

(4) 25

Solution (1)

Problem 4: If 2n+1Pn-1 : 2n-1Pn = 11: 21, then n2 + n + 15 is equal to

(1) 35

(2) 40

(3) 45

(4) 50

Solution (3)

Problem 5: Two dice are thrown. What is the probability that the sum of the numbers on the dice is 8?

(1) 5/36

(2) 1/36

(3) 1/9

(4) 7/36

Solution (1)