AIPMT 2008 · Physics

AIPMT 2008 Physics Questions with Solutions

The AIPMT 2008 paper had 53 Physics questions from 23 chapters.

Semiconductor Electronics had the most questions (5), followed by Current Electricity, Dual Nature of Radiation and Matter and 2 other chapters with 4 each.

1 question below has the answer and explanation free; the other 52 are in Premium.

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Physics questions: 53
Chapters covered: 23
Solved free here: 1 of 53
Easy / Medium / Hard: 17 / 31 / 5

Difficulty is NEET MIND's own tag for each question.

Chapter-wise: AIPMT 2008 Physics

How many questions each chapter had in AIPMT 2008. Open a chapter for its questions from every year.

All 53 AIPMT 2008 Physics questions

In paper order. Try each one, then open the answer where it is shown.

Question 1 (AIPMT 2008, Q1)
Units and MeasurementsEasy
Which two of the following five physical parameters have the same dimensions? (a) energy density (b) refractive index (c) dielectric constant (d) Young's modulus (e) magnetic field
1. Option A: (a) and (e)
2. Option B: (b) and (d)
3. Option C: (c) and (e)
4. Option D: (a) and (d)
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Question 2 (AIPMT 2008, Q2)
Units and MeasurementsEasy
If the error in the measurement of radius of a sphere is 2%, then the error in the determination of volume of the sphere will be
1. Option A: 2%
2. Option B: 4%
3. Option C: 6%
4. Option D: 8%
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Question 3 (AIPMT 2008, Q3)
Motion in a Straight LineMedium
The distance travelled by a particle starting from rest and moving with an acceleration 4/3 ms⁻² in the third second is
1. Option A: 19/3 m
2. Option B: 6 m
3. Option C: 4 m
4. Option D: 10/3 m
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Question 4 (AIPMT 2008, Q4)
Motion in a Straight LineMedium
A particle moves in a straight line with a constant acceleration. It changes its velocity from 10 ms⁻¹ to 20 ms⁻¹ while passing through a distance 135 m in t second. The value of t is
1. Option A: 9
2. Option B: 10
3. Option C: 1.8
4. Option D: 12
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Question 5 (AIPMT 2008, Q5)
Motion in a Straight LineEasy
A particle shows distance-time curve as given in the figure. The maximum instantaneous velocity of the particle is around the point
1. Option A: A
2. Option B: B
3. Option C: C
4. Option D: D
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Question 6 (AIPMT 2008, Q6)
Motion in a PlaneMedium
A particle of mass m is projected with velocity v making an angle of 45° with the horizontal. When the particle lands on the level ground the magnitude of the change in its momentum will be
1. Option A: zero
2. Option B: 2mv
3. Option C: mv/√2
4. Option D: mv√2
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Question 7 (AIPMT 2008, Q7)
Laws of MotionMedium
Sand is being dropped on a conveyor belt at the rate of M kg/s. The force necessary to keep the belt moving with a constant velocity of v m/s will be
1. Option A: Zero
2. Option B: Mv newton
3. Option C: 2Mv newton
4. Option D: Mv/2 newton
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Question 8 (AIPMT 2008, Q8)
Laws of MotionMedium
Three forces acting on a body are shown in the figure. To have the resultant force only along the y-direction, the magnitude of the minimum additional force needed is
1. Option A: √3 N
2. Option B: 0.5 N
3. Option C: 1.5 N
4. Option D: √3/4 N
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Question 9 (AIPMT 2008, Q9)
Work, Energy and PowerEasy
Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional forces are 10% of energy. How much power is generated by the turbine? (g = 10 m/s²)
1. Option A: 7.0 kW
2. Option B: 8.1 kW
3. Option C: 10.2 kW
4. Option D: 12.3 kW
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Question 10 (AIPMT 2008, Q10)
Laws of MotionMedium
A shell of mass 200 g is ejected from a gun of mass 4 kg by an explosion that generates 1.05 kJ of energy. The initial velocity of the shell is
1. Option A: 120 ms⁻¹
2. Option B: 100 ms⁻¹
3. Option C: 80 ms⁻¹
4. Option D: 40 ms⁻¹
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Question 11 (AIPMT 2008, Q11)
System of Particles and Rotational MotionMedium
The ratio of the radii of gyration of a circular disc to that of a circular ring, each of same mass and radius, around their respective axis is
1. Option A: √2 : √3
2. Option B: √3 : √2
3. Option C: 1 : √2
4. Option D: √2 : 1
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Question 12 (AIPMT 2008, Q12)
System of Particles and Rotational MotionHard
A thin rod of length L and mass M is bent at its midpoint into two halves so that the angle between them is 90°. The moment of inertia of the bent rod about an axis passing through the bending point and perpendicular to the plane defined by the two halves of the rod is
1. Option A: √2ML²/24
2. Option B: ML²/24
3. Option C: ML²/12
4. Option D: ML²/6
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Question 13 (AIPMT 2008, Q13)
Laws of MotionMedium
A roller coaster is designed such that riders experience 'weightlessness' as they go round the top of a hill whose radius of curvature is 20 m. The speed of the car at the top of the hill is between
1. Option A: 13 m/s and 14 m/s
2. Option B: 14 m/s and 15 m/s
3. Option C: 15 m/s and 16 m/s
4. Option D: 16 m/s and 17 m/s
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Question 14 (AIPMT 2008, Q14)
ThermodynamicsEasy
If Q, E and W denote respectively the heat added, change in internal energy and the work done in a closed cyclic process, then
1. Option A: Q = 0
2. Option B: W = 0
3. Option C: Q = W = 0
4. Option D: E = 0
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Question 15 (AIPMT 2008, Q15)
ThermodynamicsEasy
On a new scale of temperature (which is linear) and called the W scale, the freezing and boiling points of water are 39°W and 239°W respectively. What will be the temperature on the new scale, corresponding to a temperature of 39°C on the Celsius scale?
1. Option A: 139°W
2. Option B: 78°W
3. Option C: 117°W
4. Option D: 200°W
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Question 16 (AIPMT 2008, Q16)
Kinetic TheoryMedium
At 10°C the value of the density of a fixed mass of an ideal gas divided by its pressure is x. At 110°C this ratio is
1. Option A: (283/383)x
2. Option B: x
3. Option C: (383/283)x
4. Option D: (10/110)x
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Question 17 (AIPMT 2008, Q17)
OscillationsEasy
Two Simple Harmonic Motions of angular frequency 100 and 1000 rad s⁻¹ have the same displacement amplitude. The ratio of their maximum accelerations is
1. Option A: 1 : 10 $^4$
2. Option B: 1 : 10
3. Option C: 1 : 10 $^2$
4. Option D: 1 : 10 $^3$
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Question 18 (AIPMT 2008, Q18)
WavesMedium
The wave described by y = 0.25 sin(10πx − 2πt) where x and y are in meters and t in seconds, is a wave travelling along the
1. Option A: −ve x direction with amplitude 0.25 m and wavelength λ = 0.2 m
2. Option B: −ve x direction with frequency 1 Hz
3. Option C: +ve x direction with frequency πHz and wavelength λ = 0.2 m
4. Option D: +ve x direction with frequency 1 Hz and wavelength λ = 0.2 m
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Question 19 (AIPMT 2008, Q19)
OscillationsMedium
A point performs simple harmonic oscillation of period T and the equation of motion is given by x = a sin(ωt + π/6). After the elapse of what fraction of the time period will the velocity of the point be equal to half of its maximum velocity?
1. Option A: T/12
2. Option B: T/8
3. Option C: T/6
4. Option D: T/3
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Question 20 (AIPMT 2008, Q20)
WavesMedium
Two points are located at a distance of 10 m and 15 m from the source of oscillation. The period of oscillation is 0.05 s and the velocity of the wave is 300 m/s. What is the phase difference between the oscillations of the two points?
1. Option A: π/6
2. Option B: π/3
3. Option C: 2π/3
4. Option D: π
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Question 21 (AIPMT 2008, Q21)
Electromagnetic WavesEasy
The velocity of electromagnetic radiation in a medium of permittivity ε₀ and permeability μ₀ is given by
1. Option A: √(μ₀/ε₀)
2. Option B: √(ε₀/μ₀)
3. Option C: √(μ₀ε₀)
4. Option D: 1/√(μ₀ε₀)
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Question 22 (AIPMT 2008, Q22)
WavesMedium
Two periodic waves of intensities I₁ and I₂ pass through a region at the same time in the same direction. The sum of the maximum and minimum intensities is
1. Option A: 2(I₁ + I₂)
2. Option B: I₁ + I₂
3. Option C: (√I₁ + √I₂)²
4. Option D: (√I₁ − √I₂)²
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Question 23 (AIPMT 2008, Q23)
Ray Optics and Optical InstrumentsEasy
Two thin lenses of focal lengths f₁ and f₂ are in contact and coaxial. The power of the combination is
1. Option A: f₁ + f₂/f₁f₂
2. Option B: √f₁/f₂
3. Option C: √f₂/f₁
4. Option D: f₁ + f₂/2
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Question 24 (AIPMT 2008, Q24)
Ray Optics and Optical InstrumentsMedium
A boy is trying to start a fire by focusing Sunlight on a piece of paper using an equiconvex lens of focal length 10 cm. The diameter of the Sun is 1.39 × 10⁹ m and its mean distance from the earth is 1.5 × 10¹¹ m. What is the diameter of the Sun's image on the paper?
1. Option A: 12.4 × 10⁻⁴ m
2. Option B: 9.2 × 10⁻⁴ m
3. Option C: 6.5 × 10⁻⁴ m
4. Option D: 6.5 × 10⁻⁵ m
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Question 25 (AIPMT 2008, Q25)
Electrostatic Potential and CapacitanceMedium
The energy required to charge a parallel plate condenser of plate separation d and plate area of cross-section A such that the uniform electric field between the plates is E, is
1. Option A: 1/2 ε₀E²Ad
2. Option B: 1/2 ε₀E²/Ad
3. Option C: ε₀E²/Ad
4. Option D: ε₀E²Ad
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Question 26 (AIPMT 2008, Q26)
Electric Charges and FieldsHard
A thin conducting ring of radius R is given a charge +Q. The electric field at the centre O of the ring due to the charge on the part AKB of the ring is E. The electric field at the centre due to the charge on the part ACDB of the ring is
1. Option A: 3 E along OK
2. Option B: 3 E along KO
3. Option C: E along OK
4. Option D: E along KO
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Question 27 (AIPMT 2008, Q27)
Electrostatic Potential and CapacitanceMedium
The electric potential at a point in free space due to a charge Q coulomb is Q × 10¹¹ volts. The electric field at that point is
1. Option A: 12πϵ₀ Q × 10²² volt/m
2. Option B: 4πϵ₀ Q × 10²² volt/m
3. Option C: 12πϵ₀ Q × 10²⁰ volt/m
4. Option D: 4πϵ₀ Q × 10²⁰ volt/m
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Question 28 (AIPMT 2008, Q28)
Current ElectricityMedium
A cell can be balanced against 110 cm and 100 cm of potentiometer wire, respectively with and without being short-circuited through a resistance of 10 Ω. Its internal resistance is
1. Option A: Zero
2. Option B: 1.0 Ω
3. Option C: 0.5 Ω
4. Option D: 2.0 Ω
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Question 29 (AIPMT 2008, Q29)
Current ElectricityMedium
A wire of a certain material is stretched slowly by ten per cent. Its new resistance and specific resistance become respectively
1. Option A: 1.1 times, 1.1 times
2. Option B: 1.2 times, 1.1 times
3. Option C: 1.21 times, same
4. Option D: Both remain the same
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Question 30 (AIPMT 2008, Q30)
Current ElectricityMedium
In the circuit shown, the current through the 4 Ω resistor is 1 A when the points P and M are connected to a d.c. voltage source. The potential difference between the points M and N is
1. Option A: 3.2 volt
2. Option B: 1.5 volt
3. Option C: 1.0 volt
4. Option D: 0.5 volt
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Question 31 (AIPMT 2008, Q31)
ThermodynamicsMedium
An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from temperature 20°C? The temperature of boiling water is 100°C.
1. Option A: 4.2 min
2. Option B: 6.3 min
3. Option C: 8.4 min
4. Option D: 12.6 min
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Question 32 (AIPMT 2008, Q32)
Current ElectricityMedium
A current of 3 amp. flows through the 2 Ω resistor shown in the circuit. The power dissipated in the 5 Ω resistor is
1. Option A: 5 watt
2. Option B: 4 watt
3. Option C: 2 watt
4. Option D: 1 watt
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Question 33 (AIPMT 2008, Q33)
Moving Charges and MagnetismEasy
A particle of mass m, charge Q and kinetic energy T enters a transverse uniform magnetic field of induction $\vec{B}$ . After 3 seconds the kinetic energy of the particle will be
1. Option A: 4T
2. Option B: 3T
3. Option C: 2T
4. Option D: T
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Question 34 (AIPMT 2008, Q34)
Moving Charges and MagnetismHard
A closed loop PQRS carrying a current is placed in a uniform magnetic field. If the magnetic forces on segments PS, SR and RQ are F₁, F₂ and F₃ respectively and are in the plane of the paper and along the directions shown, the force on the segment QP is
1. Option A: F₃ − F₁ + F₂
2. Option B: F₃ − F₁ − F₂
3. Option C: √[(F₃ − F₁)² + F₂²]
4. Option D: √[(F₃ − F₁)² − F₂²]
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Question 35 (AIPMT 2008, Q35)
Moving Charges and MagnetismMedium
A circular disc of radius 0.2 meter is placed in a uniform magnetic field of induction 1/π (Wb/m²) in such a way that its axis makes an angle of 60° with B. The magnetic flux linked with the disc is
1. Option A: 0.01 Wb
2. Option B: 0.02 Wb
3. Option C: 0.06 Wb
4. Option D: 0.08 Wb
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Question 36 (AIPMT 2008, Q36)
Moving Charges and MagnetismMedium
A galvanometer of resistance 50 Ω is connected to a battery of 3 V along with a resistance of 2950 Ω in series. A full scale deflection of 30 divisions is obtained in the galvanometer. In order to reduce this deflection to 20 divisions, the resistance in series should be
1. Option A: 4450 Ω
2. Option B: 5050 Ω
3. Option C: 5550 Ω
4. Option D: 6050 Ω
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Question 37 (AIPMT 2008, Q37)
Magnetism and MatterEasy
Curie temperature is the temperature above which
1. Option A: Ferromagnetic material becomes diamagnetic material
2. Option B: Ferromagnetic material becomes paramagnetic material
3. Option C: Paramagnetic material becomes diamagnetic material
4. Option D: Paramagnetic material becomes ferromagnetic material
Show answer & explanationHide answer & explanation
Correct answer: (B) Ferromagnetic material becomes paramagnetic material
Explanation
Above the Curie temperature, thermal agitation destroys the alignment of magnetic domains in a ferromagnetic substance. As a result, the ferromagnetic material loses its spontaneous magnetization and behaves as a paramagnetic material. Hence, the correct answer is ferromagnetic material becomes paramagnetic material.
Question 38 (AIPMT 2008, Q38)
Electromagnetic InductionMedium
A long solenoid has 500 turns. When a current of 2 ampere is passed through it, the resulting magnetic flux linked with each turn of the solenoid is 4 × 10⁻³ Wb. The self-inductance of the solenoid is
1. Option A: 4.0 henry
2. Option B: 2.5 henry
3. Option C: 2.0 henry
4. Option D: 1.0 henry
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Question 39 (AIPMT 2008, Q39)
Alternating CurrentMedium
In an a.c. circuit the e.m.f. (e) and the current (i) at any instant are given respectively by e = E₀ sin ωt and i = I₀ sin(ωt − φ). The average power in the circuit over one cycle of a.c. is
1. Option A: E₀I₀
2. Option B: E₀I₀/2
3. Option C: E₀I₀/2 sinφ
4. Option D: E₀I₀/2 cosφ
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Question 40 (AIPMT 2008, Q40)
Semiconductor ElectronicsEasy
In the phenomenon of electric discharge through gases at low pressure, the coloured glow in the tube appears as a result of
1. Option A: Collision between different electrons of the atoms of the gas
2. Option B: Excitation of electrons in the atoms
3. Option C: Collision between the atoms of the gas
4. Option D: Collisions between the charged particles emitted from the cathode and the atoms of the gas
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Question 41 (AIPMT 2008, Q41)
Dual Nature of Radiation and MatterMedium
The work function of a surface of a photosensitive material is 6.2 eV. The wavelength of the incident radiation for which the stopping potential is 5 V lies in the
1. Option A: X-ray region
2. Option B: Ultraviolet region
3. Option C: Visible region
4. Option D: Infrared region
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Question 42 (AIPMT 2008, Q42)
Dual Nature of Radiation and MatterMedium
A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of 3 × 10⁶ ms⁻¹. The velocity of the particle is (mass of electron = 9.1 × 10⁻³¹ kg)
1. Option A: 2.7 × 10⁻²¹ ms⁻¹
2. Option B: 2.7 × 10⁻¹⁸ ms⁻¹
3. Option C: 9 × 10⁻² ms⁻¹
4. Option D: 3 × 10⁻³ ms⁻¹
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Question 43 (AIPMT 2008, Q43)
AtomsEasy
The ground state energy of hydrogen atom is -13.6 eV. When its electron is in the first excited state, its excitation energy is
1. Option A: 0
2. Option B: 3.4 eV
3. Option C: 6.8 eV
4. Option D: 10.2 eV
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Question 44 (AIPMT 2008, Q44)
NucleiMedium
Two radioactive materials X₁ and X₂ have decay constants 5λ and λ respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of X₁ to that of X₂ will be 1/e after a time
1. Option A: e/λ
2. Option B: λ
3. Option C: 1/2λ
4. Option D: 1/4λ
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Question 45 (AIPMT 2008, Q45)
NucleiEasy
Two nuclei have their mass numbers in the ratio 1 : 3. The ratio of their nuclear densities would be
1. Option A: 1 : 1
2. Option B: 1 : 3
3. Option C: 3 : 1
4. Option D: (3)¹ᐟ³ : 1
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Question 46 (AIPMT 2008, Q46)
NucleiMedium
If M(A; Z), Mₚ and Mₙ denote the masses of the nucleus A/Z X, proton and neutron respectively in units of u (1 u = 931.5 MeV/C²) and BE represents its binding energy in MeV, then
1. Option A: M(A, Z) = ZMₚ + (A − Z) Mₙ + BE/C²
2. Option B: M(A, Z) = ZMₚ + (A − Z) Mₙ − BE/C²
3. Option C: M(A, Z) = ZMₚ + (A − Z) Mₙ + BE
4. Option D: M(A, Z) = ZMₚ + (A − Z) Mₙ − BE
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Question 47 (AIPMT 2008, Q47)
Semiconductor ElectronicsHard
The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be
1. Option A: 100
2. Option B: 90
3. Option C: 10
4. Option D: 1.25
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Question 48 (AIPMT 2008, Q49)
Semiconductor ElectronicsMedium
The circuit shown is equivalent to
1. Option A: OR gate
2. Option B: AND gate
3. Option C: NAND gate
4. Option D: NOR gate
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Question 49 (AIPMT 2008, Q50)
Semiconductor ElectronicsMedium
A p-n photodiode is made of a material with a band gap of 2.0 eV. The minimum frequency of the radiation that can be absorbed by the material is nearly
1. Option A: 20 × 10¹⁴ Hz
2. Option B: 10 × 10¹⁴ Hz
3. Option C: 5 × 10¹⁴ Hz
4. Option D: 1 × 10¹⁴ Hz
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Question 50 (AIPMT 2008, Q51)
Dual Nature of Radiation and MatterHard
If uncertainty in position and momentum are equal, then uncertainty in velocity is
1. Option A: √h/π
2. Option B: 1/2m√h/π
3. Option C: √h/2π
4. Option D: 1/m√h/π
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Question 51 (AIPMT 2008, Q52)
Kinetic TheoryEasy
If a gas expands at constant temperature, it indicates that
1. Option A: Number of the molecules of gas increases
2. Option B: Kinetic energy of molecules decreases
3. Option C: Pressure of the gas increases
4. Option D: Kinetic energy of molecules remains the same
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Question 52 (AIPMT 2008, Q56)
Dual Nature of Radiation and MatterEasy
The measurement of the electron position is associated with an uncertainty in momentum, which is equal to 1 × 10⁻¹⁸ g cm s⁻¹. The uncertainty in electron velocity is, (mass of an electron is 9 × 10⁻²⁸ g)
1. Option A: 1 × 10¹¹ cm s⁻¹
2. Option B: 1 × 10⁹ cm s⁻¹
3. Option C: 1 × 10⁶ cm s⁻¹
4. Option D: 1 × 10⁵ cm s⁻¹
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Question 53 (AIPMT 2008, Q79)
Semiconductor ElectronicsEasy
With which one of the following elements silicon should be doped so as to give p-type semiconductor?
1. Option A: Boron
2. Option B: Germanium
3. Option C: Arsenic
4. Option D: Selenium
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