Previous Question Paper of VOCLET

Hello, I want to give the exam of the VOCLET and I want the previous years’ question papers. Please provide me.

[Rajkumar Agarwal]

Hello, here I am providing you the paper of VOCLET exam as under:

1. The speed of light in a medium of refractive index 1.5 is:
a) 3x108 m/s
b) 2x108 m/s
c) 4.5x108 m/s
d) 1.5x108 m/s
Ans: b) 2x108 m/s

2. A vessel contains oil (density=0.8g/cm3) over mercury (density=13.6g/cm3). 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/cm3:
a) 3.3 gm/cm8
b) 6.4 gm/cm8
c) 7.2 gm/cm8
d) 12.8 gm/cm8
Ans: c) 7.2 gm/cm8

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-1μ
b) sin-1μ
c) cos-1μ
d) 2sin-1(μ/2)
Ans: a) tan-1μ

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 s2 in 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

16. Energy per unit volume of a stretched wire is :
a) 1/2 x load x strain
b) load x strain
c) stress and strain
d) 1/2 x stress x strain
Ans: d) 1/2 x stress x strain

17. Two rods of lengths l1 and l2 are made of materials whose co-efficient of linear expansion are α1 and α2. If the difference between the two lengths be independent of temperature :
a) l1/l2 = α1/α2
b) l1/l2 = α2/α1
c) l1^2 α1 = l2^2 α2
d) α1^2 /l1 = α2^2 / l2
Ans: b) l1/l2 = α2/α1

18. Which one of the following has highest persentage increase when a copper sphere is heated ?
a) length
b) area
c) volume
d) diameter
Ans: c) volume

19. A metallic wire of resistance 12 Ω is bent to form a square. The resistance between the two diagonal points will be :
a) 12 Ω
b) 24 Ω
c) 6 Ω
d) 3 Ω
Ans: d) 3 Ω

20. The co-efficient cubical expansion of a substance is 27x10-6 ° C-1. The increase in length of a rod of length 1 m of that substance for 1°C rise in temperature
a) 27x10-6 m
b) 27x10-6 cm
c) 9x10-6 m
d) 9x10-6 cm
Ans: a) 27x10-6 m

21. What must be the work done to produce 1K Cal heat ? :
a) 4.2 J
b) 4.2 x 103 J
c) 4.2 x 107 J
d) none of the above
Ans: b) 4.2 x 103 J

22. What is the minimum resistance that can be made by using ten 0.1 Ω resistors?
a) 1 Ω
b) 0.1 Ω
c) 0.0001 Ω
d) 0.01 Ω
Ans: d) 0.01 Ω

23. State which one of the following is correct ?
a) joule= coulomb x volt
b) joule= coulomb / volt
c) joule= volt / ampere
d) joule= volt x ampere
Ans: a) joule= coulomb x volt

24. The magnetic flux Φ (in weber) linked with a coil varies with time t (in second) according to the equation Φ=6t2-5t+1. The magnitude of the induced emf in coil at t=0.25 s is :
a) 12 V
b) 8 V
c) 6 V
d) 2 V
Ans: d) 2 V

25. A conducting circular loop of redius r carries a constant current I. It is placed in an uniform magnetic field B such that B is perpendicular to the plane of the loop. The magnetic force acting on the loop is ?
a) BIr
b) 2ΠIrB
c) Zero
d) ΠIrB
Ans: c) Zero

Here I am providing you the paper as under: