WBJEE Physics and Chemistry Practice Set 1
Original WBJEE-style practice set for physics and chemistry with balanced questions and answer explanations.
Exam Pattern & Rules
Negative Marking: Category 1: -0.25, Category 2: -0.5, Category 3: none
Note: Paper 1 is Mathematics. Paper 2 is Physics + Chemistry.
Practice Set Details
WBJEE Physics and Chemistry Practice Set 1: all 6 questions with answers
Try each question first, then open “Show answer” to check the correct option and explanation.
Q1.In a chemical reaction, which of these is a physical change?
- A.Rusting of iron
- B.Melting of ice
- C.Combustion of petrol
- D.Formation of salt
Show answer
Correct answer: B. Melting of ice
Melting of ice is a physical change because the substance remains water.
Q2.A current of 2 A passes through a conductor for 3 seconds. How much charge flows?
- A.2 C
- B.3 C
- C.5 C
- D.6 C
Show answer
Correct answer: D. 6 C
Charge = current × time = 2 × 3 = 6 coulombs.
Q3.Which molecule is polar?
- A.CO2
- B.H2
- C.H2O
- D.N2
Show answer
Correct answer: C. H2O
Water is polar because of its bent shape and unequal electron distribution.
Q4.Which of these is a vector quantity?
- A.Mass
- B.Speed
- C.Force
- D.Temperature
Show answer
Correct answer: C. Force
Force has both magnitude and direction, so it is a vector.
Q5.What is the chemical formula of water?
- A.H2
- B.O2
- C.H2O
- D.CO2
Show answer
Correct answer: C. H2O
Water is H2O.
Q6.A body weighing 10 N is held stationary. What is the net force on the body?
- A.10 N downward
- B.10 N upward
- C.0 N
- D.Cannot say
Show answer
Correct answer: C. 0 N
When the body is stationary, forces balance and net force is 0 N.