BHU PMT Physics Question Papers 2015 - All students who have applied for admission to MBBS/BDS through Banaras Hindu University (BHU) Pre Medical Test (PMT) can find here previous year solved Physics question papers for examination to be held in 2015.
The candidates seeking admission to MBBS/BDS Course 2015 in the Institute of Medical Sciences, BHU must register themselves online in the prescribed application form available on the BHU website (www.bhu.ac.in/ims) alongwith the processing fee. However, the admission will be done on the basis of their merit in the AIPMT – 2015 examination.
Institute of Medical Sciences, Banaras Hindu University which is in its 53rd year of existence is the premier medical institution of this country. Over the last decade, it has been consistently ranked amongst the top 20 Medical Colleges of the country and in 2012 was rated as the 6th best Medical Colleges.
1. N molecules each of mass m and v velocity collides with a wall of a container and then absorbed, the pressure applied on the wall is :
(1) mNV2 (2)
mNV2
(3) 2 mNV2 (4)
mNV2
3 2
2. The law of far a day is obtained by conservation of : (1) Charge
(2) Energy
(3) Energy and magnetic field (4) Magnetic field
3. There is a q charge placed in the centre of a cube, then the emergent flux is : (1) q
(2) q
(3) q
(4) q_
6∈0 8 ∈0 2 ∈0 ∈0
4. Two thin lenses are put close to each other, focal length of the combination is : (1) less than the small focal length
(2) more than the bigger focal length
(3) equal to the arithmetical average of the focal length
(4) equal to the geometrical average of the focal length
5. A car is moving on a horizontal circular path with 10 m/s constant speed. A rigid body is suspended from ceiling of car with a 1 m. long light rod, the angle between rod and path is :
(1) 600
(2) 450
(3) 300
(4) zero
6. Two sources of E1 and E2 emf r1 and r2 internal, resistances, are connected in the parallel combination, the emf of the combination is :
(1) E1E2 (2)
E2r1 + E1r2 (3) E1r1 + E2r2 (4) E1 + E2
E1+E2 r1 + r2 r1 + r2 2
7. In a AC circuit R = 0 ΩΩ
, X
Ω
Ω
L = 8ΩΩ
and XC = 6 Ω
phase difference between voltage
and current is :
(1) 110
(2) 450
(3) 370(4) 120
8. Relative permeability of a medium is µµ
r and relative permittivity is ∈∈
r then the
velocity of an electro magnetic wave is :
(1) c
(2) √∈rµr
(3)
õ0t0
(4) 1
∈0µ0 µr∈r µr∈r www.JbigDeaL
√ µ
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r∈r
9. Ration of radius of two soap bubbles is 2 : 1 then the ratio of their excess pressure is :
(1) 2 : 1
(2) 4 : 1
(3) 1 : 4
(4) 1: 2
10. Ratio of sound velocities is H2 and O2 will be :
(1) 32 : 1
(2) 1 : 4
(3) 16 : 1
(4) 4 : 1
11. In which of the waves the energy is not propagated : (1) em waves
(2) longitudional waves
(3) stationary waves
(4) transverse waves
12. A body of 2 kg. mass is moving under a force, relation between time and displacement is x = t3 where x in meter and t in time work done in first two seconds is : 3
(1) 1.6 J
(2) 16 J
(3) 160 J
(4) 1600 J
13. A uniform chain of L length and M mass, two third part of chain is on a frictionless table and one third part is vertically suspended, work done to pull the whole chain on table, is :
(1) MgL (2)
MgL (3)
MgL (4)
MgL
18 9 6 3
14. If the intensity and frequency of incident light is doubled then : (1) photo electric current will become is times
(2) kinetic energy of the emitted electron will be increased and current will be 2 times (3) kinetic energy of electrons will be 4 times
(4) the kinetic energy of electrons will be 2 times
15. A car travels half distance with 40 kmph and rest half distance with 60 kmph then the average speed of car is :
(1) 60 kmph
(2) 52 kmph (3) 48 kmph (4) 40 kmph
16. Two particle are moving with same velocities in the circular paths of r1 and r2
radius then the ratio of their centripetal forces is :
(1) r2
(2) r2
(3) r1 2
(4) r2 2
r1 √ r1 r2 r1
17. No. of electrons in the 92 U 235 nucleus is :
(1) 143
(2) 235
(3) 92
(4) zero
18. The wavelength of photon and electron is
λph and λe and energy (E) of the two is
same then :
(1) the difference can be obtain if E is given
(2) λe>λph
(3) λph . λe
(4) λph=λe
19. A lift is moving with acceleration a in upward direction then the force applied by mass m on the floor of lift will be :
(1) ma
(2) m(g-a)
(3) m(g+a)
(4) mg
20. Two cars of m1 and m2 mass are moving in the circular paths of r1 and r2 radius, their speed is such that they travels one cycle in the same time, the ratio of their angular velocities is :
(1) m1r1 : m2r2 (2) 1 : 1
(3) r1 : r2 (4)
m1 : m2
21. A ring of mass M, radius r is moving with angular velocity w, if another two bodies each of mass m is placed on its diameter, the resultant angular velocity will be :
(1) w(M + 2m)
(2) w(M – 2m) (3)
wM (4)
wM
M (M + 2m) (m+m) (M+2m) 22. The wavelength of 1 ke V photon 1.25 x 10-9 m the frequency of Me V photon will be:
(1) 1.24 x 1023 (2) 2.4 x 1023
(3) 2.4 x 1023
(4) 1.24 x 1015
23. Size of nucleusis of the order of :
(1) 10-13 cm
(2) 10-10 cm. (3)
10-8 cm. (4)
10-15 cm.
24. If MI, angular acceleration and torque of body is I, ∝ and τ, it is revolving with ω angular velocity then :
(1) τ = α
(2) M= 1 (3)
τ= Iα (4)
τ=Iω
I α
25. In a uniform circular motion :
(1) both acceleration and speed changes
(2) both acceleration and speed are constant
(3) both acceleration and velocity are constant
(4) both acceleration and velocity changes
26. Ratio of average kinetic evergies of H2 and O2 at a given temp. is : (1) 1 : 1
(2) 1 : 4
(3) 1 : 8
(4) 1 : 16
27. To make the working of a machine, free of magnetism, the cover of this machine must be of :
(1) non magnetic substance
(2) diamagnetic substance
(3) paramagnetic substance
(4) ferro magnetic substance
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28. λα, λβ and λr are the wavelengths of k α , kβ and kr lines of X-ray spectrum then : (1) λβ >λa>λr (2) λα < λB<λr (3)
λα > λβ > λr (4) λα = λβ = λr
29. Angular momentum of electron of H atom is proportional to : (1) 1
(2) 1
(3)
√r
(4) r2
r √ r
30. MI, rotational kinetic energy and angular momentum of a body is I, E and L
then :
(1) E= L2 (2)
E2= 2I
(3) E = 2IL
(4) L = E2
2I L 2I 31. In a diode value, the state of saturation can be obtained easily by : (1) high plate voltage and high filament
(2) low filament current and high plate voltage
(3) low plate voltage and high plate tem
(4) high filament current and high plate voltage
32. A magnet is dropped in a long coppertube vertically, the acceleration of magnet : (1) equal to g
(2) less than g
(3) zero
(4) greater than g
33. Joule-second is unit of :
(1) rotational power
(2) angular momentum
(3) rotational energy
(4) torgue
34. A 3 coulomb charge enerts 3000 N force in a uniform electrical field, the distance between two points is 1 cm. potential difference will be : (1) 9000 V
(2) 1000 V
(3) 90 V
(4) 10 V
35. 1000 drops, each v volt, are combined to form a big drop, then the potential of the drop will be how many times :
(1) 1 (2) 10 (3) 100
(4) 1000
36. A plane is revoloving around the earth with 100 km./hr. speed at a earth, the changes in the velocity as it travels half circle is :
(1) 100 √2 kmph
(2) 150 kmph (3) 200 kmph (4) zero
37. 3 x 107 kg. water is initially constant and it is displaced 3 m. by applying 5 x 104
N force. Velocity of water will be (if resistance of water is zero) : (1) 50 m/sec. (2) 0 1 m/sec. (3) 60 m/sec. (4) 1.5 m/sec.
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38. In a wheat stone circuit P = Q = 10
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Ω and R = S = 15 Ω and G = 20 Ω. If a cell of 1.5
volt emf is used, the current drawn from the cell is :
(1) 0.021 amp
(2) 0.025 amp (3) 0.060 amp
(4) 0.125 amp
39. Two waves of same frequency and different amplitude, if the phase difference is π/2
then the Lissajou’s figure will be :
(1) 8 shape (2) an ellipse (3) a circle
(4) a straight line
40. A monoatomic gas (r = 5/3) and a diatomic gas (r= 7/5) are mixed in equal ratio then the r of mixture will be :
(1) 3.07
(2) 1.53
(3) 1.5
(4) 1.4
41. Velocity of e.m. waves in paraffine is 2.07 x 108 m/sec. then the dielectric constant is: (1) 2.10
(2) 1.87
(3) 1.45
(4) 1.22
42. After emission of a β-particle, the nucleus :
(1) A – 4, Z – 2
(2) A,Z-1
(3) A, Z-2
(4) A + 2, Z
43. Charge on a proton is 9.6 x 107 c/kg. A proton is moving in a 1T magnetic field in 0.5
m radius circular path, the energy of proton in Mev.
(1) 16.34
(2) 12.02
(3) 8.25
(4) 4.84
44. If d2ω + αx = 0 then the angular frequency will be : dx2
(1) √α (2)
α2
(3) α
(4)
zero
45. Noble prize presented to Einstein for :
(1) therories of LASER
(2) photo electric effect
(3) theory of relativity
(4) theory of specific heat in solids
46. Before saturation current the ratio of plate currents at 400 v and 200 v plate voltage is:
(1) 1 (2)
2
(3)
2√2 (4)
√2
2 4
47. If I = I0 sin (ω t - π/2) and E = E0 sin ωt then the power loss is : (1) EI (2)
E0I0 (3)
E0I0 (4)
zero
√2 2 √2
48. If the temp. of an ideal gas filled in a container is increased 10C, the increase in pressure is 0.4%, the initial temp. of the gas is :
(1) 1200C (2)
2000K (3)
2500K (4)
2500C
49. Plate resistances of two triode values is 2KΩ and 4KΩ, amplification factor of each of the value is 400. The ratio of voltage amplifications, when used with 4kΩ load resistance, will be :
(1) 10
(2) 4/4
(3) 4/3
(4) 16/3
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50. Relation between displacement x
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and time t is x = 2 – 5t + 6t2, the initial velocity will
be:
(1)-3 m/sec. (2) 12 m/sec. (3) 2 m/sec. (4) – 5 m/sec.
51. Focal length of a convex lens is 16 cm. it is dipped in water. The refractive indices of the substance of lens and water are 1.5 and 1.33 resp., now the focal length will be : (1) 64 cm.
(2) 18 cm.
(3) 24.24 cm. (4) 16 cm.
52. In a half wave rectifier circuit, the input signal frequency is 50 Hz, the the output frequency will be :
(1) 25 Hz
(2) 50 Hz
(3) 200 Hz
(4) 100 Hz
53. In the following circuit :
B A P
C D Q
(1) the loop will be displaced along the length of wire
(2) PQ unchanged
(3) the loop will repell the wire
(4) wire will attract the loop
54. In a triode the ratio of small change in plate voltage and small changes in grid voltage is, if plate current is constant :
(1) DC plate resistance
(2) mutual conductance
(3) AC plate resistance
(4) amplification factor
55. Two particles accelerated with same voltage eneters in a uniform magnetic field perpendicularly, the radii of the circular paths is R1 and R2, the charge on particles is same the ratio of m1 is :
2 m2 2
(1) R2
(2) R2
(3) R1
(4) R1
R1 R1 R2 R2
56. Light Velocity in diamond is ( µ = 2.0)
(1) 60 x 1010 cm/sec.
(2) 2 x 1010 cm/sec.
(3) 3 x 1010 cm/sec.
(4) 1.5 x 1010 cm/sec.
57. If Arsenic is dopped to silicon then its conductivity : (1) becomes zero
(2) unchanged
(3) increases
(4) decreases
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58. Two condensers of c and 2c capacity are connected in parallel and these are charged upto v volt. If the battery is removed and dielectric medium of k constant is put between the plates, then the potential at each condenser is :
(1) v
(2) 2+ k
(3) 2v
(4) 3v
k + 2 3v k + 2 k+2
59. Equation of wave is y = 15 x 10-2 sin (300t – 100x) where x in meter and t in sec. the wave velocity is :
(1) 1.5 m/sec. (2) 3 m/sec. (3) 0.5 m/sec. (4) 1 m/sec.
60. Escape velocity at the surface of earth is 11 km/sec., if radius of earth is doubled then the escape velocity will be :
(1) 15.5 km/sec.
(2) 5.5 km/sec. (3) 11 km/sec. (4) 22 km/sec.
61. Kinetic energies of two bodies of 1 kg. and 4 kg. are same, the ratio of their momentum is :
(1) 1 : 16
(2) 1 : 2
(3) √2 : 1
(4) 4 : 1
62. A body takes 5 minute to cool from 300C to 500 C. How much time it will take to cool from 600 C to 300 C, if room temp. is 200 C :
(1) 40 minute
(2) 10 minute (3) 30 minute (4) 20 minute
63. AC voltage is v = 200 sin 300t and if R = 10Ω and L = 800 mH, peak value of current is :
(1) 1.83
(2) 1.5
(3) 2.0
(4) .83
64. Two charges + q and – q are placed at r distance from each other. If one of the charge is stationary and other is rotated around, work done is one circle is : (1) kq2 (2)
kq
(3)
kq2 (4)
zero
r2 r r
65. Peak value of AC current is 4√2, RMS current is :
(1) 2√2
(2) 8
(3) 4 √2 (4)
4
66. A monoatomic gas is compressed to its 1/8th volume adiabatically (r = 5/3), the pressure will be :
(1) 32 times
(2) 40 times
(3) 8 times
(4) 24 times
3 5
67. A condenser is charged and then battery is removed, a dielectric plate is put between the plates of condenser, then correct statement is :
(1) Q constant V and U decreases
(2) Q constant V increases U decreases
(3) Q increases V decreases U increases
(4) None
68. The MI of a disc wrt its diameter is I, MI wrt. And axis passing through its circumference and parallel to diameter is :
www.JbigDeaL
(1) 41
(2) 61
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(3) 31
(4) 51
69. Length of two wires is 0.5 m and distance between the wires is 1 m. If 1 amp.
current is passed in the wires, force per unit length between the wires is : (1) 4 x 10-7
(2) 2 x 10-7 (3)
10-7 (4) None
70. Relation between internal energy U and absolute temp. T of an ideal gas as kinetic theory of gases, is :
(1) U does not depends upon T
(2) U ∝ T2
(3) U ∝ T
(4) U ∝ √T
71. Light wavelength in a glass is 6000Ǻ and refractive index is 1.5, the wavelength of light is :
(1) 12000 Ǻ (2)
4000
Ǻ (3)
9000
Ǻ (4)
6000
Ǻ
72. Two sources of sound A & B placed near to each other produces 4 beats per second.
If A is loaded with wax then 2 beats/sec. are produced. If the frequency of A is 256 Hz, The frequency of B will be :
(1) 262
(2) 260
(3) 252
(4) 250
73.Work done to rotate a dipole by a 900 angle, is :
(1) – PE
(2) – 2 PE
(3) 2PE
(4) PE
74. Zener diode may be used as a :
(1) rectifier
(2) oscillator (3) amplifier (4) voltage regulator
75. Wavelength of first line of Balamer series is 6561 Ǻ then the wavelength of second line of Balmer series will be :
(1) 3500 Ǻ (2)
4860
Ǻ (3)
6561
Ǻ (4)
2430
Ǻ
1. A body of mass 20 gm moving at 200 m/sec passes through a plank and its velocity reduces to 100 m/ sec. In passing through the plank, what part of its K.E. is lost:
a. 1/4
b. 1/2
c. 3/4
d. 2/3
2. The tension in the string revolving in a vertical circle with a mass m at the end which is at the lowest position
a. mv2/r
b. (mv2/r)- mg
c. (mv2/r)+ mg
d. mg
3. A bomb of mass 12 kg explodes into two pieces of mases 4 kg and 8 kg. The velocity of mass 8 kg is 6 m/sec. The kinetic energy of mass 4 kg will be :
a. 48 joule
b. 32 joule
c. 24 joule
d. 288 joule
4. A block of mass M slides along the sides of a flat bottomed bowl. The slides of the bowl are frictionless and the base has a coefficient of friction 0.2. If the block is released from the top of the side which is 1.5 m high, where will the block come to rest. Given, the length of the base is 15 m:
a. 1 m from P
b. Mid point of flat part PQ
c. 2 m from P
d. at Q
5. The power of a pump, which can pump 200 kg of water to a height of 200 m in 10 sec is (g=10 m/s2):
a. 40 kW
b. 80 kW
c. 400 kW
d. 960 kW
6. A long spiral sprig is stretched by 2 cm, its P.E. is U. If the srping is stretched by 10 cm, then the P.E. of the spring is :
a. U/ 25
b. U / 5
c. 5 U
d. 25U
7. Two springs have their force constant as k1 and k2 (k1 > k2). When they are stretched by the same force:
a. No work is done in case of both the springs
b. Equal work is doen in case of both the springs
c. More work is done in case of second spring
d. More work is done in case of first spring
8. A monkey sits on the pan of spring scale kept in an elevator. The reading of the spring scale will be maximum when :
a. The elevator is stationary
b. The elevator cable breaks and it falls freely towards earth
c. The elevator accelerates downwards
d. The elevator accelerates upwards
9. Friction force is
a. self adjustable
b. not self adjustable
c. both (a) and (b)
d. none of these
10. A body of mass 2 kg is hung on a spring balance mounted vertically in a lift. If the lift moves up with a constant velocity of 2 m/sec, the reading on the balance wil be
a. 2 kg
b. 4 kg
c. Zero
d. 1 kg
11. A boy of 50 kg is standing in a lift moving down with an acceleration 9.8 m/s2. The apparanet weight of the boy is
a. zero
b. 50N
c. 50×9.8N
d. 50/9.8 N
13. Maximum value of force of friction is called
a. limiting friction
b. rolling friction
c. normal friction
d. kinetic friction
14. The linear momentum p of a body moving in one dimension varies with time according to the equation p = a+bt2 where a and b are positive constants. The net force acting on the body is:
a. proportional to t2
b. a constant
c. proportional to t
d. inversely proportional to t
15. Three blocks of masses m1, m2 and m3 are connected by massless strings as shown on a frinctionless table. They are pulled with a force T3 = 40 N. If m1 = 10 kg, m2 = 6 kg, and m3 = 4 kg, the tension T2 will be:
a. 20N
b. 40 N
c. 10 N
d. 32 N
16. A box is lying on an inclined plane. If the box starts sliding when the angle of inclination is 60°, then the coefficient of static friction of the box and plane is
a. 2.732
b. 1.732
c. 0.267
d. 0.176
17. A machine gun shoots a 40 g bullet at a speed of 1200 m/s. The man operating the gun can exert and average force of 144 N at the most. How many bullets (maximum number) can be shot per sec?
a. 3
b. 4
c. 2
d. 6
18. A body of mass 50 kg is pulled by a rope of length 6 m on a frictionless surface by a fore of 106 N applied to the other end. The linear density of the rope is 0.5 kg/m. The force acting on 50 kg mass is
a. 50 N
b. 100 N
c. 150 N
d. 200 N
19. A constant force acting on a body of mass 3.0 kg changes its speed from 2.0 ms–1 to 3.5 ms–1 in 25 seconds. The direction of motion of the body remains unchanged. What is the magnitude of force?
a. 0.09 N
b. 0.045 N
c. 0.18 N
d. None of these
20. The average force necessary to stop a hammer with 25 N-s momentum is 1000 N. The time required is
a. 25 s
b. 2.5 × 104 s
c. 0.25 s
d. 0.025 s
21. A man of mass 60 kg is standing on a spring balance inside a lift. If the lift falls freely downwards, then the reading of the spring balance will be
a. 60 kgf
b. More than 60 kgf
c. Less than 60 kgf
d. Zero
22. When a wagon is pulled by a horse, the force that causes the horse to move forward is the force
a. He exerts on the wagon
b. The wagon exerts on him
c. The ground exerts on him
d. He exerts on the ground
23. A machine gun fires 10 bullet/s, each of mass 10 g, the speed of each bullet is 20 cm/s, then force of recoil is
a. 200 dyne
b. 2000 dyne
c. 20 dyne
d. none of these
24. A light spring balance hangs from the hook of the other light spring balance and a block of mass M kg hangs from the former one. Then the true statement about the scale reading is
a. Both the scales read M kg each
b. The scale of the lower one reads M kg and of the upper one zero
c. The reading of the two scales can be anything but the sum of the reading will be M kg
d. Both the scales read M/2 kg
25. A 40 N block is supported by two ropes. One rope is horizontal and the other makes an angle of 30° with the ceiling. The tension in the rope attached to the ceiling is approximately
a. 80 N
b. 40 N
d. 34.6 N
d. 46.2 N
26. Phenolphthalein of pH range [8-10] is used in which of the following type of titration as a suitable indicator :
a. NH4OH and HCI
b. NH4OH and HCOOH
c. NH4OH and C2H4O2
d. NaOH and C2O4H2
27. The oxidation number of C atom in Ch2CI2 and CCI4 are respectively :
a. -2 and – 4
b. 0 and – 4
c. 0 and 4
d. 2 and 4
28. Which of the following compound is not aromatic :
(1) 1, 3-cyclobutene
(2) pyridine
(3) furane
(4) thiophene
29. L.P.G. mainly consist of the following :
a. Methane
b. Hydrogen
c. Acetylene
d. Butane
30. A sample of petroleum contains 30% n-heptane, 10% 2-methyl hexane and 60% 2, 2, 4-trimethyl pentane, the octane no. of this sample will be :
a. 30%
b. 60%
c. 10%
d. 70%
31. The hydrogen ion concentration of a solution is 3.98 x 10-6 mole per liter. The pH value of this solution will be :
a. 6.0
b. 5.8
c. 5.4
d. 5.9
32. Which of the following acids does not contain – COOH group :
a. Carbamic acid
b. Barbituric acid
c. Lactic acid
d. succinnic acid
33. The solution of BiCl3 in dil. HCI when diluted with water white precipitate is formed which is :
a. Bismith oxychloride
b. Bismith oxide
c. Bismith hydroxide
d. none of these
34. Which of the following aromatic compound gives sulphonation reaction very easily :
a. Chlorobenzene
b. Nitrobenzene
c. Toluene
d. benzene
35. The natural rubber is the polymer of :
a. 1, 3- butadiene
b. polyamide
c. isoprene
d. none of these
36. The volume concentration of hydrogen peroxide 6.8% concentration will be :
a. 5
b. 11.2
c. 22.4
d. 20
37. Benzene reacts with CH3COCI in presence of Lewis acid AICI3 to form :
a. Acetophenone
b. Toluene
c. Benzyl Chloride
d. Chlorobenzene
38. The mole of hydrogen ion in 50 ml. of 0.1 M HCI solution will be :
a. 5 x 102
b. 5 x 10-3
c. 5 x 103
d. 5 x 10-2
39. F3 is :
a. Bronsted base
b. Lewis base
c. Lewis acid
d. Bronsted acid
40. The false statement for Griynaed reagent is :
a. It gives tertiary alcohol with acetamide
b. It gives tertiary alcohol with acetone
c. It gives secondary alcohol with acetaldehyde
d. It gives primary alcohol with formaldehyde
41. Primary halides follow the following reaction mechanism :
a. SN1
b. SN2
c. both
d. none of these
42. “The negative part of the molecule adding to the double bond goes to that unsaturated asymmetric carbon atom which is linked to the least number of hydrogen atoms.” This statement is related to :
a. Markownikoff’s law
b. Peroxide effect
c. Bayer’s law of distortion
d. none of these
43. The shape of the molecule having hybrid orbitals of 20% character will be :
a. octahedral
b. tetrahedral
c. square planer
d. triangular bipyramidal
44. Which of the following gives red precipitate with ammonical cuprous chloride :
a. Propane
b. Ethane
c. Methane
d. Acetylene
45. The pH of a solution is 5. If the dilution of this solution is increased by 100 times, the pH value will be :
a. 5
b. 7
c. 9
d. 8
46. The tetraethyl lead mixed in petrol is works as :
a. Cooling agent
b. Anti knocking agent
c. Bleaching agent
d. None of these
47. Fool’s gold is :
a. Cu2S
b. FeS2
c. Al2O5
d. CuFeS2
48. The alkaline hydrolysis of ester is known as :
a. dehydrogenation
b. dehydration
c. esterification
d. saponification
49. C-H bond length is least in :
a. Acetylene
b. Methane
c. Ethylene
d. Ethane
50. Which of the following compound forms white precipitate with bromine water :
a. Nitrobenzene
b. Phenol
c. Benzene
d. all above
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