The previous year Physics question paper of JEXPO which is conducted by West Bengal State Council of Technical Education (WBSCTE) in West Bengal is as follows:

1. The speed of light in a medium of

refractive index 1.5 is:

a) 3x10 8 m/s

b) 2x10 8 m/s

c) 4.5x10 8 m/s

d) 1.5x10 8 m/s

Ans: b) 2x10 8 m/s

2. A vessel contains oil (density=0.8g/cm 3 ) over

mercury (density=13.6g/cm 3 ). A homogeneoussphere

floats with half its volume immersed in mercury and

other half in oil. The density of the material of the

sphere in g/cm 3 :

a) 3.3 gm/cm 8

b) 6.4 gm/cm 8

c) 7.2 gm/cm 8

d) 12.8 gm/cm 8

Ans: c) 7.2 gm/cm 8

3. A ray of light passes from vacuum

into a medium of refractive index μ. If

the reflected ray and the refracted ray

are perpendicular to each other, the

angel of incidence is:

a) tan -1 μ

b) sin -1 μ

c) cos -1 μ

d) 2sin -1 (μ/2)

Ans: a) tan -1 μ

4. A certain wire has resistance of 10 ohm. If it is

stretched by 1/10th of its length then the resistance is

nearly:

a) 9 ohm

b) 10 ohm

c) 11 ohm

d) 12 ohm

Ans: c) 11 ohm

5. A virtual image is formed by a

convex lens when the object lies:

a) on focus

b) between f and 2f

c) within focus and pole

d) between 2f and infinity

Ans: b) between f and 2f and d)

between 2f and infinity

6. Equivalent resistance between A and B is :
a) 9 Ω*
b) 4 Ω
c) 7 Ω*
d) 5Ω*
Ans: c) 11Ω


7. A boat takes 2 hours to travel 8km and back in still water. If the velocity of water is 4 km/hr, the time taken for going upstream 8 km and coming back is :*
a) 2 hr*
b) 2 hr 40 min*
c) 1 hr 20 min*
d) 4 hr*
Ans: b) 2 hr 40 min


8. The work done by a lifting machine in lifting a load of 100 kg to the top of building of height 20 m is (g=9.8 m/s2) :*
a) 0.196 x 103J*
b) 1.196 x 103J
c) 19.6 x 103J*
d) 196.0 x 103J*
Ans: c) 19.6 x 103J


9. The S.I unit of magnetic flux is :*
a) weber/m^2*
b) amp-m^2*
c) weber*
d) volt*
Ans: c) weber


10. A cork of specific gravity 0.8 is taken under water (sp. gr.=1) and relesed. THe upward acceleration of the cork is :*
a) g*
b) g/2
c) g/4*
d) g/6*
Ans: c) g/4

11. Two body of masses mA*and mB*(mA> mB) and momentum PA*and PB*respectively have the same kinetic energy (KE). Then :*
a) PA*= PB*
b) PA*< PB
c) PA*> PB*
d) PA*≈ PB*(≈ approximately equal to)*
Ans: c) PA*> PB
12. The power of a concave lens of focal length 20 cm is :*
a) +5.0 D*
b) -5.0 D
c) +0.5 D*
d) -0.5 D
Ans: b) -5.0 D

13. The critical angle of light ray from medium A into medium B is θ. The speed of light in medium A is v. The speed of light in medium B is :*
a) v/sinθ*
b) v sinθ
c) v/tanθ*
d) v tanθ*
Ans: a) v/sinθ

14. A body, starting from rest and moving with a constant acceleration, covers a distance s1*in 2nd second and a distance s2in the 4th second. The ratio of s1/ s2*is :*
a) 1/4*
b) 3/7
c) 1/3*
d) 5/9
Ans: b) 3/7


15. Four wires of the same material are stretched by the same load. The dimensions are given below. Which of them will elongate the most ?*
a) length-100 cm, diameter-1mm*
b) length-200 cm, diameter-2mm
c) length-300 cm, diameter-3mm*
d) length-400 cm, diameter-0.5mm*
Ans: d) length-400 cm, diameter-0.5mm

Attached Files

West Bengal JEXPO Physics Question Paper.zip (14.0 KB, 56 views)