WBJEE Questions from Previous Year Papers: West Bengal Joint Entrance Examination (WBJEE 2021) will be held on 11 July 2021. As per the schedule, WBJEE will be release the admit card 7 July 2021. More than 1 lakh students appearing in this exam. By clear the entrance exam, you get admission in engineering and technology, pharmacy and architecture courses in the state’s universities, colleges and self-financed institutions.

There will be two papers in WBJEE 2021 – Paper 1 and Paper 2. In Paper 1, candidates have ask Maths question and in Paper 2  Physics and Chemistry questions ask to candidates. Both papers will be of 100-100 numbers. Here we prepared the quiz of most important questions from Paper 2 – Physics and Chemistry. These questions are elected from the previous question papers of WBJEE.  At the end of this quiz you can also download the PDF of all Previous Papers.

### WBJEE Important Questions from Previous Year Papers

Question: When 100 g of boiling water at 100 °C is added into a calorimeter containing 300 g of cold water at 10 °C. temperature of the mixture becomes 20 °C. Then a metallic block of mass ! kg at 10 °C is dipped into the mixture in the calorimeter. After reaching thermal equilibrium, the final temperature becomes 19 °C, What is the specific heat of the metal in C.G.8. untt ?

(A) 0.01

(B) 0.09

(C) 0.1

(D) 0.3

Question: When a DC voltage is applied at the two ends of a circuit kept in a closed box, it 18 observed that the current gradually increases from zero to a certain value and then remains constant. What do you think that the circuit contains?

(A) A capacitor alone

(B) Aresistor alone

(C) A resister and an inductor in series

(D) A resistor and a capacitor in series

Answer- A resister and an inductor in series

Question: Consider the circuit shown. If all the cells have negligible internal resistance, what will be the current through the 2Ω resistor when steady state is reached?

(A) 0.66A

(B) 0.29

(C) 0A

(D) 014A

Question: A thin convex lens is placed just above an empty vessel of depth 80 cm. The image of a coin kept at the bottom of the vessel is thus formed 20 cm above the lens. If now water is poured in the vessel up to a height of 64 cm, what will be the approximate new position of the image. Assume that refractive index of water is 4/3.

(A) 21.33 em above the lens

(B) 6.67 cm below the lens

(C) 33.67 cm above the lens

(D) 24 cm above the lens

Answer- 21.33 em above the lens

Question: For nuclei with mass number close to 119 and 238, the binding energies per nucleon are approximately 7.6 MeV and 8.6 MeV respectively. If a nucleus of mass number 238 breaks into two nuclei of nearly equal masses, what will be the approximate amount of energy released in the process of fission?

(A) 214 Mev

(B) 119Mev

(C) 2047 MeV

(D) 1142 MeV

Question: Consider an engine that absorbs 130 cal of heat from a hot reservoir and delivers 39 cal heat to a cold reservoir in cach cycle. The engine also consumes 2 J energy in each cycle io overcome friction, If the engine works at 90 cycles per minute, what will be the maximum power delivered to the load?

(A) 816 W

(B) 819W

(C) 627 W

(D) 630 W

Question: Equal masses of ethane and hydrogen are mixed in an empty container at 298 K. The

fraction of total pressure exerted by hydrogen is

(A) 15:16

(B) 1:1

(C) 1:4

(D) 1:6

Question: Which of the following statements is not true for the reaction: 2 , + 2 O → 4HF + ?

(A)  is more strongly oxidising than

(B)F – F bond is weaker than O = O bond

(C) H—F bond is stronger than H – O bond

(D) F is less electronegative than O

Answer- F is less electronegative than O

Question: The number of unpaired electrons in the uranium ( ) atom is:

(A) 4

(B) 6

(C) 3

(D) 1

Question: Which of the following has the largest number of atoms?

(A) 1 g of Ag

(B) 1 g of Fe

(C) 1 g of C

(D) 1 g of Mg