AIPMT 2008 Prelims

180 Questions • 180 Minutes • 2008

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Q21
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?
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Q22
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
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Q23
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
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Q24
A wire of a certain material is stretched slowly by ten per cent. Its new resistance and specific resistance become respectively
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Q25
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.
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Q26
A particle of mass m, charge Q and kinetic energy T enters a transverse uniform magnetic field of induction B⃗. After 3 seconds the kinetic energy of the particle will be
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Q27
A circular disc of radius 0.2 metre 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 B⃗. The magnetic flux linked with the disc is
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Q28
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
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Q29
Curie temperature is the temperature above which
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Q30
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
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Q31
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 i = I₀ sin(ωt − φ) The average power in the circuit over one cycle of a.c. is
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Q32
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
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Q33
A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of 3 × 10⁶ m s⁻¹. The velocity of the particle is (mass of electron = 9.1 × 10⁻³¹ kg)
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Q34
The ground state energy of hydrogen atom is −13.6 eV. When its electron is in the first excited state, its excitation energy is
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Q35
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
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Q36
Two nuclei have their mass numbers in the ratio of 1 : 3. The ratio of their nuclear densities would be
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Q37
If M(A; Z), Mp and Mn denote the masses of the nucleus ᴬ_ZX, proton and neutron respectively in units of u (1 u = 931.5 MeV/c²) and BE represents its binding energy in MeV, then
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Q38
The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be
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Q39
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
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Q40
With which one of the following elements silicon should be doped so as to give p-type of semiconductor?
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Paper Info
  • Exam: AIPMT Prelims
  • Year: 2008
  • Questions: 180
  • Duration: 180 mins
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