JEE Main Daily Practice Questions 8 January 2025

JEE Main Daily Practice Questions 8 January 2025: 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 8 January  2025, including five questions from each subject: Mathematics, Physics, and Chemistry.

Also Read | JEE Main Daily Practice Questions 8 January 2025

JEE Main Daily Practice Questions 8 January 2025: Physics

Candidates can check out the JEE Main daily practice questions 8 January 2025 from the Physics section: 

Question 1: A microscope was initially placed in air (refractive index 1). It is then immersed in oil (refractive index 2). For a light whose wavelength in air is l, calculate the change of microscope’s resolving power due to oil and choose the correct option.

(A) Resolving power will be 1/4 in the oil than it was in the air.

(B) Resolving power will be twice in the oil than it was in the air.

(C) Resolving power will be four times more in the oil than it was in the air.

(D) Resolving power will be 1/2 in the oil than it was in the air.

Answer (C)

Question 2: What is the half-life period of a radioactive material if its activity drops to 1/16 th of its initial value in 30 years?

(A) 9.5 years             

(B) 8.5 years

(C) 7.5 years             

(D) 10.5 years

Answer (C)

Question 3: At a particular station, the TV transmission tower has a height of 100 m. To triple its coverage range, height of the tower should be increased to

(A) 200 m                  

(B) 300 m

(C) 600 m                  

(D) 900 m

Answer (D)

Question 4: The one division of the main scale of Vernier callipers reads 1mm and 10 divisions of Vernier scale is equal to the 9 divisions on the main scale. When the two jaws of the instrument touch each other, the zero of the Vernier lies to the right of zero of the main scale and its fourth division coincides with a main scale division. When a spherical bob is tightly placed between the two jaws, the zero of the Vernier scale lies in between 4.1 cm and 4.2 cm and 6th Vernier division coincides with a main scale division. The diameter of the bob will be × 10–2 cm.

(A) 402             

(B) 412

(C) 422  

(D) 432

Answer (B)

Question 5: Two beams of light having intensities I and 4I interfere to produce a fringe pattern on a screen. The phase difference between the two beams are p/2 and p/3 at points A and B respectively. The difference between the resultant intensities at the two points is xI. The value of x will be .

(A) 0

(B) 1 

(C) 2

(D) 3

Answer (C)

JEE Main Daily Practice Questions 8 January 2025: Chemistry

Candidates can check out the JEE Main daily practice questions 8 January 2025 from the Chemistry section: 

Question 1: The total number of Mn=O bonds in Mn2O7 is    _.

(A) 4

(B) 5

(C) 6

(D) 3

Answer (C)

Question 2: A sugar ‘X’ dehydrates very slowly under acidic conditions to give furfural which on further reaction with resorcinol gives the coloured product after some time. Sugar ‘X’ is

(A)  Aldopentose

(B)  Aldotetrose

(C) Oxalic acid

(D) Ketotetrose

Answer (A)

Question 3: Given below are two statements.

Statement I : Iron (III) catalyst, acidified K2Cr2O7 and neutral KMnO4 have the ability to oxidise I– to I2 independently.

Statement II : Manganate ion is paramagnetic in nature and involves p – p bonding.

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

(A) Both Statement I and Statement II are true

(B) Both Statement I and Statement II are false

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

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

Answer (B)

Question 4: In the Carius method of estimation of halogen, 0.45 g of an organic compound gave 0.36 g of AgBr. Find out the percentage of bromine in the compound.

(Molar masses: AgBr = 188 g mol–1; Br = 80 g mol–1)

(A) 34.04%

(B) 40.04%

(C) 36.03%

(D) 38.04%

Answer (A)

Question 5: 20 mL of 0.02 M K2Cr2O7 solution is used for the titration of 10 mL of Fe2+ solution in the acidic medium. The molarity of Fe2+ solution is             ×10–2 M. (Nearest integer)

(A) 20

(B) 22

(C) 24

(D) 26

Answer (C)

JEE Main Daily Practice Questions 8 January 2025: Mathematics

Candidates can check out the JEE Main daily practice questions 8 January 2025 from the Maths section: 

Problem 1: In an increasing geometric series, the sum of the second and the sixth term is 25/2 and the product of the third and fifth term is 25. Then, the 4th,6th and 8th is equal to 

(1) 26               

(2) 35

(3) 30

(4) 32

Solution (2)

Problem 2: The number of seven digit integers with sum of the digits equal to 10 and formed by using the digits 1, 2 and 3 only is :                                                           (1) 77

(2) 42

(3) 82

(4) 32

Solution (1)

Problem 3: Let A be a symmetric matrix of order 2 with integer entries. If the sum of the diagonal elements of A2 is 1, then the possible number of such matrices is :

(1) 6  

(2) 1

(3) 4

(4) 12

Solution (3)

Problem 4:  A fair coin is tossed a fixed number of times. If the probability of getting 7 heads is equal to probability of getting 9 heads, then the probability of getting 2 heads is :

(1) 15/2^13

(2)  15/2^12

(3) 15/2^5

(4)  15/2^8

Solution (1)

Problem 5: The intersection of three lines x – y = 0, x + 2y = 3 and 2x + y = 6 is a :

(1) None of the above

(2) Isosceles triangle

(3)   Right angled triangle

(4) Equilateral triangle

Solution (2)

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