JEE Main DPP 21 November 2024: Daily practice problems for 2025 aspirants

JEE Main DPP 21 November 2024

JEE Main DPP 21 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 21 November 2024, including five questions from each subject: Mathematics, Physics, and Chemistry.

Also Read | NEET Daily Practice Questions 21 November 2024: DPP for 2025 aspirants

JEE Main DPP 21 November 2024: Physics

Candidates can check out the JEE Main DPP 21 November 2024 daily practice problems for 2025 aspirants from the Physics section:

Question 1: ‘n’ polarizing sheets are arranged such that each makes an angle 45° with the preceding sheet. An unpolarized light of intensity I is incident into this arrangement. The output intensity is found to be I/64 . The value of n will be

(1) 3

(2) 4

(3) 6

(4) 5

Answer (3)

Question 2: A block of mass 5 kg is placed at rest on a table of rough surface. Now, if a force of 30 N is applied in the direction parallel to the surface of the table, the block slides through a distance of 50 m in an interval of time 10 s. Coefficient of kinetic friction is (given, g = 10 ms–2)

(1) 0.50

(2) 0.60

(3) 0.75

(4) 0.25

Answer (1)

Question 3: Given below are two statements:

Statement I: Acceleration due to gravity is different at different places on the surface of earth.

Statement II: Acceleration due to gravity increases as we go down below the earth’s surface.

In the light of the above statements, choose the correct 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 (2)

Question 4: A steel wire with mass per unit length 7.0 × 10–3 kg m–1 is under tension of 70 N. The speed of transverse waves in the wire will be

(1) 200p m/s

(2) 100 m/s

(3) 50 m/s

(4) 10 m/s

Answer (2)

Question 5: The average kinetic energy of a molecule of the gas is

(1)  dependent on the nature of the gas

(2)  proportional to volume

(3)  proportional to absolute temperature

(4)  proportional to pressure

Answer (3)

JEE Main DPP 21 November 2024: Chemistry

Candidates can check out the JEE Main DPP  21 November 2024 daily practice problems for 2025 aspirants from the Chemistry section:

Question 1: Given below are two statements:

Statement I: Chlorine can easily combine with oxygen to form oxides; and the product has a tendency to explode.

Statement II: Chemical reactivity of an element can be determined by its reaction with oxygen and halogens.

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

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

(2) Both the Statements I and II are true

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

(4) Both the Statements I and II are false

Answer (2)

Question 2: Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R

Assertion A: Hydrogen is an environment friendly fuel.

Reason R: Atomic number of hydrogen is 1 and it is a very light element.

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

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

(2)  A is true but R is false

(3)  Both A and R are true but R is NOT the correct explanation of A

(4)  A is false but R is true

Answer (3)

Question 3: A solution of FeCI3 when treated with K4[Fe(CN)6] gives a prussiun blue precipitate due to the formation of

(1)  Fe3[Fe(CN)6]2

(2) Fe4[Fe(CN)6]3

(3) Fe[Fe(CN)6]

(4) K[Fe2(CN)6]

Answer (2)

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

Assertion A: In an Ellingham diagram, the oxidation of carbon to carbon monoxide shows a negative slope with respect to temperature.

Reason R: CO tends to get decomposed at higher temperature.

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

(1)  A is not correct but R is correct

(2)  A is correct but R is not correct

(3)  Both A and R are correct but R is NOT the correct explanation of A

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

Answer (2)

Question 5: Which of the following are the examples of double salt?

(A)  FeSO4.(NH4)2SO4.6H2O

(B)  CuSO4.4NH3.H2O

(C)  K2SO4.Al2(SO4)3.24H2O

(D)  Fe(CN)2.4KCN

Choose the correct answer

(1) B and D only

(2) A and C only

(3) A, B and D only

(4) A and B only

Answer (2)

JEE Main DPP 21 November 2024: Mathematics

Candidates can check out the JEE Main DPP 21 November 2024 daily practice problems for 2025 aspirants from Maths section:

Problem 1: The mean and variance of 5 observations are 5 and 8 respectively. If 3 observations are 1, 3, 5, then the sum of cubes of the remaining two observations is

(1) 1456

(2) 1216

(3) 1792

(4) 1072

Solution (4)

Problem 2: In a binomial distribution B(n, p), the sum and the product of the mean and the variance are 5 and 6 respectively, then 6(n + p – q) is equal to

(1) 52

(2) 50

(3) 53

(4) 51

Solution (1)

Problem 3: 80. Let a1 = 8, a2, a3, …, an be an A.P. If the sum of its first four terms is 50 and the sum of its last four terms is 170, then the product of its middle two terms is        .

(1) 454

(2) 554

(3) 654

(4) 754

Solution (4)

Problem 4: Number of 3-digit numbers that are divisible by either 2 or 3 but not divisible by 7, is:

(1) 414

(2) 514

(3) 314

(4) 214

Solution (2)

Problem 5: The number of words, with or without meaning, that can be formed using all the letters of word ASSASSINATION so that vowels occur together, is

(1) 50400

(2) 50450

(3) 50430

(4) 50420

Solution (1)