AIPMT 2011 Mains | NEET Year Wise Previous Years Questions

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1. The density of a material in CGS system of units is 4 g cm$$-$$3. In a system of units in which unit of length is 10 cm 2. A particle covers half of its total distance with speed v1 and the rest half distance with speed v2. Its average speed d 3. A projectile is fired at an angle of 45o with the horizontal. Elevation angle of the projectile at its highest point as 4. A conveyor belt is moving at a constant speed of 2 ms$$-$$1. A box is gently dropped on it. The coefficient of friction 5. A mass m moving horizontally (along the x-axis) with velocity $$v$$ collides and sticks to a mass of 3m moving verticall 6. A small mass attached to a string rotates on a frictionless table top as shown. If the tension in the string is increase 7. 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 8. A particle of mass M is situated at the centre of a spherical shell of same mass and radius a. The magnitude of the grav 9. A mass of diatomic gas $$(\gamma = 1.4)$$ at a pressure of 2 atmospheres is compressed adiabatically so that its temper 10. Two particles are oscillating along two close parallel straight lines side by side, with the same frequency and amplitud 11. Two identical piano wires, kept under the same tension T have a fundamental frequency of 600 Hz. The fractional increase 12. The electric potential V at any point (x, y, z), all in metres in space is given by V = 4x2 volt. The electric field at 13. Three charges, each +q, are placed at the corners of an isosceles triangle ABC of sides BC and AC, 2$$a$$. D and E are t 14. In the circuit shown in the figure, if the potential at point A is taken to be zero, the potential at point B is 15. A galvanometer of resistance, G, is shunted by a resistance S ohm. To keep the main current in the circuit unchanged, th 16. Charge q is uniformly spread on a thin ring of radius R. The ring rotates about its axis with a uniform frequency $$f$$ 17. A square loop, carrying a teady current $$I$$, is placed in a horizontal plane near a long straight conductor carrying a 18. 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 st 19. 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 20. The r.m.s. value of potential difference V shown in the figure is 21. A converging beam of rays is incident on a diverging lens. Having passed through the lens the rays intersect at a point 22. A thin prism of angle 15o made of glass of refractive index $$\mu $$1 = 1.5 is combined with another prism of glass of r 23. The threshold frequency for a photosensitive metal is 3.3 $$ \times $$ 1014 Hz. If light of frequency 8.2 $$ \times $$ 1 24. Out of the following which one is not a possible energy for a photon to be emitted by hydrogen atom according to Bohr's 25. 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 26. An electron in the hydrogen atom jumps from excited state n to the ground state. The wavelength so emitted illuminates a 27. A Zener diode, having breakdown voltage equal to 15 V, is used in a voltage regulator circuit shown in figure. The curre 28. In the following figure, the diodes which are forward biased, are 29. Pure Si at 500 K has equal number of electron (ne) and hole (nh) concentrations of 1.5 $$ \times $$ 1016 m$$-$$3. Doping 30. A thermocouple of negligible resistance produces an e.m.f. of 40 µV/ºC in the linear range of temperature. A galvanomete

AIPMT 2011 Mains

MCQ (Single Correct Answer)

-1

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, then the value of n is

AIPMT 2011 Mains

MCQ (Single Correct Answer)

-1

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

AIPMT 2011 Mains Physics - Semiconductor Electronics Question 72 English

5 mA

10 mA

15 mA

20 mA

AIPMT 2011 Mains

MCQ (Single Correct Answer)

-1

In the following figure, the diodes which are forward biased, are

AIPMT 2011 Mains Physics - Semiconductor Electronics Question 71 English

(A), (B) and (D)

(B) and (D)

AIPMT 2011 Mains

MCQ (Single Correct Answer)

-1

Pure Si at 500 K has equal number of electron (n_e) and hole (n_h) concentrations of 1.5 $$ \times $$ 10¹⁶ m^$$-$$3. Doping by indium increases n_h to 4.5 $$ \times $$ 10²² m^$$-$$3. The doped semiconductor is of

p-type having electron concentration n_e = 5 $$ \times $$ 10⁹ m^$$-$$3

n-type with electron concentration n_e = 5 $$ \times $$ 10²² m^$$-$$3

p-type with electron concentration n_e = 2.5 $$ \times $$ 10¹⁰ m^$$-$$3

n-type with electron concentration n_e = 2.5 $$ \times $$ 10²³ m^$$-$$3

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