WBJEE Exam Previous Question Paper

Will you please provide me question paper for West Bengal Joint Entrance Examination soon ?

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Here I am giving you question paper for West Bengal Joint Entrance Examination in a file attached with it so you can get it easily.

A train approaching a railway platform with a speed of 20 ms–1 starts blowing the whistle. Speed of sound
in air is 340 ms–1. If the frequency of the emitted sound from the whistle is 640 Hz, the frequency of sound
to a person standing on the platform will appear to be
A. 600 Hz B. 640 Hz C. 680 Hz D. 720 Hz

2. A straight wire of length 2 m carries a current of 10A If this wire is placed in a uniform magnetic field of
0.15 T making an angle of 45° with the magnetic field, the applied force on the wire will be
A. 1.5 N B. 3 N C. 3 2 N D.

4. Heat is produced at a rate given by H in a resistor when it is connected across a supply of voltage V. If
now the resistance of the resistor is doubled and the supply voltage is made
V
3
then the rate of production
of heat in the resistor will be
A.
H
18
B.
H
9
C. 6H D. 18H
5. Two elements A and B with atomic numbers ZA and ZB are used to produce characteristic x-rays with
frequencies vA and vB respectively. If ZA : ZB = 1:2, then vA : vB will be
A. 1 2 : B. 1 : 8 C. 4 : 1 D. 1 : 4
6. The de Broglie wavelength of an electron moving with a velocity
C
2
(C = velocity of light in vacuum) is
equal to the wavelength of a photon. The ratio of the kinetic energies of electron and photon is
A. 1 : 4 B. 1 : 2 C. 1 : 1 D. 2 : 1

8. A box of mass 2 kg is placed on the roof of a car. The box would remain stationary until the car attains
a maximum acceleration. Coefficient of static friction between the box and the roof of the car is 0.2 and
g = 10 ms–2.
This maximum acceleration of the car, for the box to remain stationary, is
A. 8 ms–2 B. 6 ms–2 C. 4 ms–2 D. 2 ms–2

9. The decimal number equivalent to a binary number 1011001 is
A. 13 B. 17 C. 89 D. 178

10. The frequency of the first overtone of a closed pipe of length l1 is equal to that of the first overtone of an
open pipe of length l2. The ratio of their lengths (l1 : l2) is
A. 2 : 3 B. 4 : 5 C. 3 : 5 D. 3 : 4

West Bengal Joint Entrance Examination paper