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WBJEE Subjective Phy & Chem Sample Paper | WBJEE Sample Papers, Section Wise & Full Mock Tests 2025 PDF Download

Question: 1. The displacement x of a particle at time t moving under a constant force is WBJEE Subjective Phy & Chem Sample Paper | WBJEE Sample Papers, Section Wise & Full Mock Tests 2025 in meters, t in seconds. Find the work done by the force in the interval from t = 0 to t = 6 second.
Ans:  WBJEE Subjective Phy & Chem Sample Paper | WBJEE Sample Papers, Section Wise & Full Mock Tests 2025
v at t = 0, – 6 m/s
v at t = 6 sec., 6 m/s
change in KE is zero ⇒ work done = 0

Question: 2. Calculate the distance above and below the surface of the earth at which the acceleration due to gravity is the same
Ans:  WBJEE Subjective Phy & Chem Sample Paper | WBJEE Sample Papers, Section Wise & Full Mock Tests 2025
on solving we get
– Rh + R2 – h2 = 0
WBJEE Subjective Phy & Chem Sample Paper | WBJEE Sample Papers, Section Wise & Full Mock Tests 2025

Question: 3. A ray of light travelling inside a rectangular glass block of refractive index √2 is incident on the glass-air surface at an angle of incidence of 45°. Show that the ray will emerge into the air at an angle of refraction equal to 90°
Ans:  Given C = 45°
WBJEE Subjective Phy & Chem Sample Paper | WBJEE Sample Papers, Section Wise & Full Mock Tests 2025
So the ray will graze the interface after refraction at an angle of 90°

Question: 4. Two cells each of same e.m.f ‘e’ but of internal resistances r1 and r2 are connected in series through an external resistance R. If the potential difference between the ends of the first cell is zero, what will be the value of R in terms r1 and r2 ?
Ans: 
WBJEE Subjective Phy & Chem Sample Paper | WBJEE Sample Papers, Section Wise & Full Mock Tests 2025

Question: 5. At time t = 0, a radioactive sample has a mass of 10 gm. Calculate the expected mass of radioactive sample after two successive mean lives.
Ans:  
Two successive mean lives = WBJEE Subjective Phy & Chem Sample Paper | WBJEE Sample Papers, Section Wise & Full Mock Tests 2025
No. of nuclei after two mean lives =  WBJEE Subjective Phy & Chem Sample Paper | WBJEE Sample Papers, Section Wise & Full Mock Tests 2025
Therefore mass =  WBJEE Subjective Phy & Chem Sample Paper | WBJEE Sample Papers, Section Wise & Full Mock Tests 2025

Question: 6. Calculate the number of H+ ion present in 1 ml of a solution whose pH is 10.
Ans: pH = 10
[H+] = 10–10 M
In 1000 ml solution there are 6.023 × 1013 H+ ions
In 1 ml solution there are 6.023 × 1010 H+ ions 

Question: 7. 
Give the structure of pyro-sulfuric acid. How would you prepare it? What would you observe when colourless HI is added to pyro-sulfuric acid?
Ans:  
WBJEE Subjective Phy & Chem Sample Paper | WBJEE Sample Papers, Section Wise & Full Mock Tests 2025
WBJEE Subjective Phy & Chem Sample Paper | WBJEE Sample Papers, Section Wise & Full Mock Tests 2025

Question: 8. Write with a balanced chemical equation how gypsum is used for the conversion of ammonia into ammonium sulfate without using H2 SO4 .
Ans:  Balanced reaction is
2NH3 + CaSO4 + CO2 + H2O = (NH4 )2 SO4 + CaCO3

Question: 9.  Convert phenol to p-hydroxy acetophenone in not more than 2 steps.
Ans: 
WBJEE Subjective Phy & Chem Sample Paper | WBJEE Sample Papers, Section Wise & Full Mock Tests 2025
Question: 10. An organic compound ‘A’ on treatment with ammoniacal silver nitrate gives metallic silver and produces a yellow crystalline precipitate of molecular formula C9H10N4O4 , on treatment with Brady’s reagent. Give the structure of the organic compound ‘A’.
Ans:  Compound (A) is an aldehyde. It should be propanal CH3CH2CHO
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WBJEE Subjective Phy & Chem Sample Paper | WBJEE Sample Papers, Section Wise & Full Mock Tests 2025
WBJEE Subjective Phy & Chem Sample Paper | WBJEE Sample Papers, Section Wise & Full Mock Tests 2025
 

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FAQs on WBJEE Subjective Phy & Chem Sample Paper - WBJEE Sample Papers, Section Wise & Full Mock Tests 2025

1. What is the format of the WBJEE subjective physics and chemistry paper?
Ans. The WBJEE subjective physics and chemistry paper consists of subjective type questions where candidates have to provide detailed written answers.
2. How can I prepare for the WBJEE physics and chemistry paper?
Ans. To prepare for the WBJEE physics and chemistry paper, it is important to thoroughly study the concepts and theories of physics and chemistry. Practice solving previous years' question papers and sample papers to familiarize yourself with the exam pattern and improve your problem-solving skills.
3. Are there any specific topics that are frequently asked in the WBJEE physics and chemistry paper?
Ans. While there are no specific topics that are guaranteed to be asked in the WBJEE physics and chemistry paper, it is recommended to give more attention to important topics like mechanics, electrostatics, thermodynamics, organic chemistry, inorganic chemistry, and physical chemistry. These topics usually carry a significant weightage in the exam.
4. Can I use a calculator during the WBJEE physics and chemistry paper?
Ans. No, the use of calculators or any other electronic devices is strictly prohibited during the WBJEE physics and chemistry paper. Candidates are expected to solve the problems manually without any external aids.
5. Is there negative marking in the WBJEE physics and chemistry paper?
Ans. Yes, there is negative marking in the WBJEE physics and chemistry paper. For every incorrect answer, 1/4th of the total marks allotted to that question will be deducted. However, there is no negative marking for unattempted questions.
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