Answer sheet of WBJEE

My sister is preparing for the exam of the West Bengal joint entrance exam so for this she is looking for the last year question paper with the Answer sheet of it so will you please help me by giving the last year question paper with the answer key of the exam of the West Bengal joint entrance exam? Give me the link for the syllabus of it?

Can you provide me the WBJEE (West Bengal Joint Entrance Examination) 2019 Physics Question Paper with Answer Key conducted by West Bengal Joint Entrance Examination Board?

[Arun Vats]

The WBJEE (West Bengal Joint Entrance Examination) 2019 Physics Question Paper with Answer Key conducted by West Bengal Joint Entrance Examination Board is as follows:


In Young’s experiment for the interference of light, the separation between the slits is d and the distance of the screen from the slits is D. If D is increased by 0.5% and d is decreased by 0.3%, then for the light of a given wavelength, which one of the following is true?
“The fringe width.......”
(A) increases by 0.8% (B) decreases by 0.8%
(C) increases by 0.2% (D) decreases by 0.2%
Ans: (A)


When the frequency of the light used is changed form 4 × 1014 s–1 to 5 × 1014 s–1, the angular width of the principal (central) maximum in a single slit Fraunhoffer diffraction pattern changes by 0.6 radian. What is the width of the slit (assume that the experiment is performed in vacuum)?
(A) 1.5 ×10–7 m (B) 3 × 10–7 m (C) 5 × 10–7 m (D) 6 ×10–7m
Ans: (C)


A parent uncleus X undergoes
-decay with a half-life of 75000 years. The daughter nucleus Y undergoes
-decay with a half-life of 9 months. In a particular sample, it is found that the rate of emission of
-particles is nearly constant (over several months) at 107/hour. What will be the number of
-particles emitted in an hour?
(A) 102 (B) 107 (C) 1012 (D) 1014
Ans: (B)


The density of the material of a cube can be estimated by measuring its mass and the length of one of its sides. If the maximum error in the measurement of mass and length 0.3% and 0.2% respectively, the maximum error in the estimation of the density of the cube is approximately
(A) 1.1% (B) 0.5% (C) 0.9% (D) 0.7%
Ans: (C)


The density of the material of a cube can be estimated by measuring its mass and the length of one of its sides. If the maximum error in the measurement of mass and length 0.3% and 0.2% respectively, the maximum error in the estimation of the density of the cube is approximately
(A) 1.1% (B) 0.5% (C) 0.9% (D) 0.7%
Ans: (C)


WBJEE 2019 Physics Question Paper with Answer Key