AIPMT 2011 · Physics

AIPMT 2011 Physics Questions with Solutions

The AIPMT 2011 paper had 31 Physics questions from 19 chapters.

Current Electricity, Moving Charges and Magnetism and Semiconductor Electronics had the most questions (3 each).

1 question below has the answer and explanation free; the other 30 are in Premium.

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Physics questions: 31
Chapters covered: 19
Solved free here: 1 of 31
Easy / Medium / Hard: 6 / 22 / 3

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All 31 AIPMT 2011 Physics questions

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Question 1 (AIPMT 2011, Q88)
Electromagnetic WavesEasy
"Good ozone" is found in the:
1. Option A: Mesosphere
2. Option B: Troposphere
3. Option C: Stratosphere
4. Option D: Ionosphere
The answer and explanation for this question are in NEET MIND Premium.
Question 2 (AIPMT 2011, Q91)
WavesMedium
Two identical piano wires kept under the same tension T have a fundamental frequency of 600 Hz. The fractional increase in the tension of one of the wires which would lead to occurrence of 6 beats/second when both the wires oscillate together would be:
1. Option A: 0.02
2. Option B: 0.03
3. Option C: 0.04
4. Option D: 0.01
The answer and explanation for this question are in NEET MIND Premium.
Question 3 (AIPMT 2011, Q92)
Semiconductor ElectronicsMedium
In the following figure, the diodes which are forward biased, are:
1. Option A: (c) only
2. Option B: (c) and (a)
3. Option C: (b) and (d)
4. Option D: (a), (b) and (d)
The answer and explanation for this question are in NEET MIND Premium.
Question 4 (AIPMT 2011, Q93)
Dual Nature of Radiation and MatterMedium
The threshold frequency for a photosensitive metal is 3.3 × 10¹⁴ Hz. If light of frequency 8.2 × 10¹⁴ Hz is incident on this metal, the cut-off voltage for the photoelectric emission is nearly:
1. Option A: 2 V
2. Option B: 3 V
3. Option C: 5 V
4. Option D: 1 V
The answer and explanation for this question are in NEET MIND Premium.
Question 5 (AIPMT 2011, Q94)
Current ElectricityMedium
A galvanometer of resistance G is shunted by a resistance S ohm. To keep the main current in the circuit unchanged, the resistance to be put in series with the galvanometer is:
1. Option A: S²/(S + G)
2. Option B: SG/(S + G)
3. Option C: G²/(S + G)
4. Option D: G/(S + G)
The answer and explanation for this question are in NEET MIND Premium.
Question 6 (AIPMT 2011, Q95)
Moving Charges and MagnetismMedium
A square loop, carrying a steady current I, is placed in a horizontal plane near a long straight conductor carrying a steady current I₁ at a distance d from the conductor as shown in figure. The loop will experience:
1. Option A: a net repulsive force away from the conductor
2. Option B: a net torque acting upward perpendicular to the horizontal plane
3. Option C: a net torque acting downward normal to the horizontal plane
4. Option D: a net attractive force towards the conductor
The answer and explanation for this question are in NEET MIND Premium.
Question 7 (AIPMT 2011, Q96)
Current ElectricityEasy
A thermocouple of negligible resistance produces an e.m.f. of 40 μV/°C in the linear range of temperature. A galvanometer of resistance 10 ohm whose sensitivity is 1 μA/division, is employed with the thermocouple. The smallest value of temperature difference that can be detected by the system will be:
1. Option A: 0.5°C
2. Option B: 1°C
3. Option C: 0.1°C
4. Option D: 0.25°C
The answer and explanation for this question are in NEET MIND Premium.
Question 8 (AIPMT 2011, Q97)
Alternating CurrentMedium
The r.m.s. value of potential difference V shown in the figure is:
1. Option A: V₀
2. Option B: V₀/√2
3. Option C: V₀/2
4. Option D: V₀/√3
The answer and explanation for this question are in NEET MIND Premium.
Question 9 (AIPMT 2011, Q98)
Alternating CurrentMedium
A coil has resistance 30 ohm and inductive reactance 20 ohm at 50 Hz frequency. If an ac source of 200 volt, 100 Hz, is connected across the coil, the current in the circuit will be:
1. Option A: 4.0 A
2. Option B: 8.0 A
3. Option C: 20/√13 A
4. Option D: 2.0 A
The answer and explanation for this question are in NEET MIND Premium.
Question 10 (AIPMT 2011, Q99)
GravitationMedium
A particle of mass m is thrown upwards from the surface of the earth, with a velocity u. The mass and the radius of the earth are respectively M and R. G is gravitational constant and g is acceleration due to gravity on the surface of the earth. The minimum value of u so that the particle does not return back to earth, is:
1. Option A: √(2GM/R)
2. Option B: √(2GM/R²)
3. Option C: √(2gR²)
4. Option D: √(2GM/R²)
The answer and explanation for this question are in NEET MIND Premium.
Question 11 (AIPMT 2011, Q100)
Semiconductor ElectronicsMedium
Pure Si at 500 K has equal number of electron (nₑ) and hole (nₕ) concentrations of 1.5 × 10¹⁶ m⁻³. Doping by indium increases nₕ to 4.5 × 10²² m⁻³. The doped semiconductor is of:
1. Option A: n-type with electron concentration nₑ = 5 × 10²² m⁻³
2. Option B: p-type with electron concentration nₑ = 2.5 × 10¹⁰ m⁻³
3. Option C: n-type with electron concentration nₑ = 2.5 × 10²³ m⁻³
4. Option D: p-type having electron concentration nₑ = 5 × 10⁹ m⁻³
The answer and explanation for this question are in NEET MIND Premium.
Question 12 (AIPMT 2011, Q101)
Moving Charges and MagnetismMedium
Charge q is uniformly spread on a thin ring of radius R. The ring rotates about its axis with a uniform frequency f Hz. The magnitude of magnetic induction at the centre of the ring is:
1. Option A: μ₀qf / 2R
2. Option B: μ₀q / 2fR
3. Option C: μ₀q / 2πfR
4. Option D: μ₀qf / 2πR
The answer and explanation for this question are in NEET MIND Premium.
Question 13 (AIPMT 2011, Q102)
Semiconductor ElectronicsMedium
A zener diode, having breakdown voltage equal to 15 V, is used in a voltage regulator circuit shown in figure. The current through the diode is:
1. Option A: 10 mA
2. Option B: 15 mA
3. Option C: 20 mA
4. Option D: 5 mA
The answer and explanation for this question are in NEET MIND Premium.
Question 14 (AIPMT 2011, Q103)
Motion in a Straight LineEasy
A particle covers half of its total distance with speed v₁ and the rest half distance with speed v₂. Its average speed during the complete journey is:
1. Option A: Option (1)
2. Option B: Option (2)
3. Option C: Option (3)
4. Option D: Option (4)
Show answer & explanationHide answer & explanation
Correct answer: (B) Option (2)
Explanation
Let total distance be 2S. Time taken: $t = \frac{S}{v_1} + \frac{S}{v_2}$ Average speed: $v_{avg} = \frac{2S}{\frac{S}{v_1} + \frac{S}{v_2}}$ $v_{avg} = \frac{2v_1v_2}{v_1 + v_2}$
Question 15 (AIPMT 2011, Q104)
Electrostatic Potential and CapacitanceMedium
The electric potential V at any point (x, y, z), all in meters in space is given by V = 4x² volt. The electric field at the point (1, 0, 2) in volt/meter is:
1. Option A: 8 along positive X-axis
2. Option B: 16 along negative X-axis
3. Option C: 16 along positive X-axis
4. Option D: 8 along negative X-axis
The answer and explanation for this question are in NEET MIND Premium.
Question 16 (AIPMT 2011, Q105)
Moving Charges and MagnetismEasy
A short bar magnet of magnetic moment 0.4 J T⁻¹ is placed in a uniform magnetic field of 0.16 T. The magnet is in stable equilibrium when the potential energy is:
1. Option A: -0.064 J
2. Option B: zero
3. Option C: -0.082 J
4. Option D: 0.064 J
The answer and explanation for this question are in NEET MIND Premium.
Question 17 (AIPMT 2011, Q106)
Ray Optics and Optical InstrumentsMedium
A thin prism of angle 15° made of glass of refractive index μ₁ = 1.5 is combined with another prism of glass of refractive index μ₂ = 1.75. The combination of the prism produces dispersion without deviation. The angle of the second prism should be:
1. Option A: 7°
2. Option B: 10°
3. Option C: 12°
4. Option D: 5°
The answer and explanation for this question are in NEET MIND Premium.
Question 18 (AIPMT 2011, Q107)
Laws of MotionMedium
A conveyor belt is moving at a constant speed of 2 m/s. A box is gently dropped on it. The coefficient of friction between them is μ = 0.5. The distance that the box will move relative to belt before coming to rest on it taking g = 10 ms⁻², is:
1. Option A: 1.2 m
2. Option B: 0.6 m
3. Option C: zero
4. Option D: 0.4 m
The answer and explanation for this question are in NEET MIND Premium.
Question 19 (AIPMT 2011, Q108)
ThermodynamicsHard
A mass of diatomic gas (γ = 1.4) at a pressure of 2 atmospheres is compressed adiabatically so that its temperature rises from 27°C to 927°C. The pressure of the gas in its final state is:
1. Option A: 28 atm
2. Option B: 68.7 atm
3. Option C: 256 atm
4. Option D: 8 atm
The answer and explanation for this question are in NEET MIND Premium.
Question 20 (AIPMT 2011, Q109)
Laws of MotionMedium
A mass m moving horizontally along the x-axis with velocity v collides and sticks to a mass 3m moving vertically upward along the y-axis with velocity 2v. The final velocity of the combination is:
1. Option A: Option (1)
2. Option B: Option (2)
3. Option C: Option (3)
4. Option D: Option (4)
The answer and explanation for this question are in NEET MIND Premium.
Question 21 (AIPMT 2011, Q110)
OscillationsHard
Two particles are oscillating along two close parallel straight lines side by side, with the same frequency and amplitudes. They pass each other, moving in opposite directions when their displacement is half of the amplitude. The mean positions of the two particles lie on a straight line perpendicular to the paths of the two particles. The phase difference is:
1. Option A: 0
2. Option B: 2π/3
3. Option C: π
4. Option D: π/6
The answer and explanation for this question are in NEET MIND Premium.
Question 22 (AIPMT 2011, Q111)
System of Particles and Rotational MotionMedium
A small mass attached to a string rotates on a frictionless table top as shown. If the tension in the string is increased by pulling the string causing the radius of the circular motion to decrease by a factor of 2, the kinetic energy of the mass will:
1. Option A: remain constant
2. Option B: increase by a factor of 2
3. Option C: increase by a factor of 4
4. Option D: decrease by a factor of 2
The answer and explanation for this question are in NEET MIND Premium.
Question 23 (AIPMT 2011, Q112)
Units and MeasurementsEasy
The density of material in CGS system of units is 4 g/cm³. In a system of units in which unit of length is 10 cm and unit of mass is 100 g, the value of density of material will be:
1. Option A: 0.4
2. Option B: 40
3. Option C: 400
4. Option D: 0.04
The answer and explanation for this question are in NEET MIND Premium.
Question 24 (AIPMT 2011, Q113)
Dual Nature of Radiation and MatterMedium
An electron in the hydrogen atom jumps from excited state n to the ground state. The wavelength so emitted illuminates a photosensitive material having work function 2.75 eV. If the stopping potential of the photoelectron is 10 V, the value of n is:
1. Option A: 3
2. Option B: 4
3. Option C: 5
4. Option D: 2
The answer and explanation for this question are in NEET MIND Premium.
Question 25 (AIPMT 2011, Q114)
GravitationMedium
A particle of mass M is situated at the centre of a spherical shell of mass M and radius a. The magnitude of the gravitational potential at a point situated at a/2 distance from the centre will be:
1. Option A: 2GM/a
2. Option B: 3GM/a
3. Option C: 4GM/a
4. Option D: GM/a
The answer and explanation for this question are in NEET MIND Premium.
Question 26 (AIPMT 2011, Q115)
NucleiHard
Two radioactive nuclei P and Q, in a given sample decay into a stable nucleus R. At time t = 0, number of P species are 4N₀ and that of Q are N₀. Half-life of P (for conversion to R) is 1 minute whereas that of Q is 2 minutes. Initially there are no nuclei of R present in the sample. When number of nuclei of P and Q are equal, the number of nuclei of R present in the sample will be:
1. Option A: 3N₀
2. Option B: 9N₀/2
3. Option C: 5N₀/2
4. Option D: 2N₀
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Question 27 (AIPMT 2011, Q116)
Motion in a PlaneMedium
A projectile is fired at an angle of 45° with the horizontal. Elevation angle of the projectile at its highest point as seen from the point of projection is:
1. Option A: Option (1)
2. Option B: Option (2)
3. Option C: Option (3)
4. Option D: Option (4)
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Question 28 (AIPMT 2011, Q117)
AtomsEasy
Out of the following which one is not a possible energy for a photon to be emitted by hydrogen atom according to Bohr's atomic model?
1. Option A: 1.9 eV
2. Option B: 11.1 eV
3. Option C: 13.6 eV
4. Option D: 0.65 eV
The answer and explanation for this question are in NEET MIND Premium.
Question 29 (AIPMT 2011, Q118)
Current ElectricityMedium
In the circuit shown in the figure, if potential at point A is taken to be zero, the potential at point B is:
1. Option A: -1 V
2. Option B: +2 V
3. Option C: -2 V
4. Option D: +1 V
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Question 30 (AIPMT 2011, Q119)
Ray Optics and Optical InstrumentsMedium
A converging beam of rays is incident on a diverging lens. Having passed through the lens the rays intersect at a point 15 cm from the lens on the opposite side. If the lens is removed the point where the rays would meet moves 5 cm closer to the lens. The focal length of the lens is:
1. Option A: -10 cm
2. Option B: 20 cm
3. Option C: -30 cm
4. Option D: 5 cm
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Question 31 (AIPMT 2011, Q120)
Electrostatic Potential and CapacitanceMedium
Three charges, each +q, are placed at the corners of an isosceles triangle ABC of sides BC and AC equal to 2a. D and E are the mid points of BC and CA. The work done in taking a charge Q from D to E is:
1. Option A: Option (1)
2. Option B: Option (2)
3. Option C: Option (3)
4. Option D: Option (4)
The answer and explanation for this question are in NEET MIND Premium.

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