JEE Main Daily Practice Questions 7 January 2025

JEE Main Daily Practice Questions 7 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 7 January  2025, including five questions from each subject: Mathematics, Physics, and Chemistry.

Also Read | NEET Daily Practice Questions 7 January 2025

JEE Main Daily Practice Questions 7 January 2025: Physics

Candidates can check out the JEE Main daily practice questions 7 January 2025 from the Physics section: 

Question 1: Read the following statements:

A. When the small temperature difference between a liquid and its surrounding is doubled, the rate of loss of heat of the liquid becomes twice.

B.Two bodies P and Q having equal surface areas are maintained at temperature 10°C and 20°C. The thermal radiation emitted in a given time by P and Q are in the ratio 1 : 1.15.

C. A carnot Engine working between 100 K and 400 K has an efficiency of 75%.

D. When the small temperature difference between a liquid and its surrounding is quadrupled, the rate of loss of heat of the liquid becomes twice.

Choose the correct answer from the options given below

(A) A, B, C only         

(B) A, B only

(C) A, C only             

(D) B, C, D only

Answer (A)

Question 2: Same gas is filled in two vessels of the same volume at the same temperature. If the ratio of the number of molecules is 1 : 4, then

A.  The r.m.s. The velocity of gas molecules in two vessels will be the same.

B.  The ratio of pressure in these vessels will be 1 : 4.

C. The ratio of pressure will be 1 : 1.

D.  The r.m.s.velocity of gas molecules in two vessels will be in the ratio of 1 : 4.

Choose the correct answer from the options given below

(A) A and C only         

(B) B and D only

(C) A and B only             

(D) C and D only

Answer (C)

Question 3: A direct current of 4 A and an alternating current of peak value 4 A flow through resistance of 3 ohms and 2 ohms respectively. The ratio of heat produced in the two resistances in same interval of time will be :

(A) 3 : 2

(B) 3 : 1

(C) 3 : 4

(D) 4 : 3

Answer (B)

Question 4: Two bar magnets oscillate in a horizontal plane in earth’s magnetic field with time periods of 3 s and 4 s respectively. If their moments of inertia are in the ratio of 3 : 2, then the ratio of their magnetic moments will be :

(A) 2 : 1                    

(B) 8 : 3

(C) 1 : 3                    

(D) 27 : 16

Answer (B)

Question 5: A beam of light travelling along X-axis is described by the electric field Ey = 900sin w(t – x/c). The ratio of electric force to magnetic force on a charge q moving along Y-axis with a speed of 3 × 107 ms–1 will be :

(Given speed of light = 3 × 10^8 ms–1)

(A) 1 : 1 

(B) 1 : 10 

(C) 10 : 1

(D) 1 : 2

Answer (C)

JEE Main Daily Practice Questions 7 January 2025: Chemistry

Candidates can check out the JEE Main daily practice questions 7 January 2025 from the Chemistry section: 

Question 1: The incorrect statement is

(A)  The first ionization enthalpy of K is less than that of Na and Li.

(B)   Xe does not have the lowest first ionization enthalpy in its group.

(C)The first ionization enthalpy of an element with atomic number 37 is lower than that of the element with atomic number 38.

(D)The first ionization enthalpy of Ga is higher than that of the d-block element with atomic number 30.

Answer (D)

Question 2: Which of the following methods are not used to refine any metal?

A.  Liquation

B.  Calcination

C.  Electrolysis

D.  Leaching

E.  Distillation

Choose the correct answer from the options given below :

(A) B and D only

(B) A, B, D and E only

(C) B, D and E only

(D) A, C and E only

Answer (A)

Question 3: Given below are two statements.

Statement I : Hydrogen peroxide can act as an oxidizing agent in both acidic and basic conditions.

Statement II : Density of hydrogen peroxide at 298 K is lower than that of D2O.

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 (C)

Question 4: Which oxoacid of phosphorus has the highest number of oxygen atoms present in its chemical formula?

(A) Pyrophosphorus acid

(B) Hypophosphoric acid

(C) Phosphoric acid

(D) Pyrophosphoric acid

Answer (D)

Question 5: Given below are two statements.

Statement I : The chlorides of Be and Al have Cl-bridged structure. Both are soluble in organic solvents and act as Lewis bases.

Statement II : Hydroxides of Be and Al dissolve in excess alkali to give beryllate and aluminate ions.

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 (D)

JEE Main Daily Practice Questions 7 January 2025: Mathematics

Candidates can check out the JEE Main daily practice questions 7 January 2025 from the Maths section: 

Problem 1: Let x denote the total number of one-one functions from a set A with 3 elements to a set B with 5 elements and y denote the total number of one-one functions from the set A to the set A × B. Then :

(1) 2y = 273x           

(2) 2y = 91x     

(3) y = 273x 

(4) y = 91x     

Solution (2)

Problem 2: A plane passes through the points A(1,2,3), B(2, 3, 1) and C(2, 4, 2). If O is the origin and P is (2,-1,1), then the projection of OP on this plane is of length  (1)  (⅖)^½

(2) (2/7)^½

(3) (2/3)^½

(4) (2/11)^½

Solution (4)

Problem 3:  Let A be a set of all 4-digit natural numbers whose exactly one digit is 7. Then the probability that a randomly chosen element of A leaves remainder 2 when divided by 5 is :

(1) 2/9                 

(2) 97/297

(3) 122/397                   

(4) 1/5

Solution (2)

Problem 4: The contrapositive of the statement “If you will work, you will earn money” is :

(1)  If you will earn money, you will work

(2)  You will earn money, if you will not work

(3) If you will not earn money, you will not work

(4) To earn money, you need to work

Solution (3)

Problem 5: In a group of 400 people, 160 are smokers and non-vegetarian; 100 are smokers and vegetarians and the remaining 140 are non- smokers and vegetarians. Their chances of getting a particular chest disorder are 35%, 20% and 10% respectively. A person is chosen from the group at random and is found to be suffering from the chest disorder. The probability that the selected person is a smoker and non-vegetarian is :

(1) 7/45    

(2) 28/45

(3) 14/45         

(4) 8/45

Solution (2)

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