Description: The NEET Previous
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1. The density of a material in CGS system of units is 6. A particle of mass m is thrown upwards from the
4 g/cm3. In a system of units in which unit of length surface of the earth, with a velocity u. The mass and
is 10 cm and unit of mass is 100 g, the value of the radius of the earth are, respectively, M and R.
density of material will be :- G is gravitational constant and g is acceleration due
(1) 0.04 (2) 0.4 to gravity on the surface of the earth. The minimum
(3) 40 (4) 400 value of u so that the particle does not return back
2. A particle covers half of its total distance with speed to earth, is :-
v1 and the rest half distance with speed v2. Its
average speed during the complete journey is :- 2GM 2GM
(1) (2)
R2 R
v1 + v 2 v1 v 2
(1) (2) v + v
2 1 2 2gM
(3) (4) 2gR 2
R2
2v1 v 2 v 12 v 22
(3) v + v (4) 7. A particle of mass M is situated at the centre of a
1 2 v12 + v 22 spherical shell of same mass and radius a. The
3 A mass m moving horizontally (along the x-axis) with magnitude of the gravitational potential at a point
velocity v collides and sticks to a mass of 3m moving
a
vertically upward (along the y-axis) with velocity 2v. situated at distance from the centre, will be :-
2
The final velocity of the combination is :-
GM 2GM
3 1 1 3 (1) (2)
(1) viˆ + vjˆ (2) viˆ + vjˆ a a
2 4 4 2
3GM 4GM
1 ˆ 2 ˆ 2 ˆ 1 ˆ (3) (4)
(3) vi + vj (4) vi + vj a a
3 3 3 3
8. A projectile is fired at an angle of 45° with the
4 A conveyor belt is moving at a constant speed of
horizontal. Elevation angle of the projectile at its
2 m/s. A box is gently dropped on it. The coefficient
highest point as seen from the point of projection,
of friction between them is µ = 0.5. The distance
is :-
that the box will move relative to belt before coming
(1) 45° (2) 60°
to rest on it, taking g = 10 ms–2 is :-
(1) 0.4 m (2) 1.2 m æ 3ö
1
(3) 0.6 m (4) Zero (3) tan–1 (4) tan–1 çç 2 ÷÷
5. A small mass attached to a string rotates on a 2 è ø
frictionless table top as shown. If the tension in the 9. A mass of diatomic gas (g = 1.4) at a pressure of
string is increased by pulling the string cauusing the 2 atmospheres is compressed adiabatically so that
radius of the circular motion to decrease by a factor its temperature rises from 27°C to 927°C. The
of 2, the kinetic energy of the mass will :- pressure of the gas in the final state is :-
(1) 8 atm (2) 28 atm
Z:\NODE02\B0B0-BA\NEET-UG_11 YRS(2010-2020)\ENG\2011\MAINS\01-PHY.P65
(3) 68.7 atm (4) 256 atm
r
10. 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
(1) Decrease by a factor of 2 opposite directions when their displacement is half
(2) Remain constant of the amplitude. The mean position of the two
(3) Increase by a factor of 2 particles lie on a straight line perpendicular to the
(4) Increase by a factor of 4 paths of the two particles. The phase difference is:-
p 2p
(1) (2) 0 (3) (4) p
6 3
E
,328 AIPMT Mains-2011 ALLEN
11. Two identical piano wires, kept under the same 17. A galvanometer of resistance, G, is shunted by a
tension T have a fundamental frequency of 600 Hz. resistance S ohm. To keep the main current in the
The fractional increase in the tension of one of the circuit unchanged, the resistance to be put in series
wires which will lead to occurrence of 6 beats/s when with the galvanometer is :-
both the wires oscillate together would be :-
(1) 0.01 (2) 0.02 (3) 0.03 (4) 0.04 G S2
(1) (2)
12. A thin prism of angle 15° made of glass of refractive (S + G) (S + G)
index µ 1 = 1.5 is combined with another prism of
glass of refractive index µ 2 = 1.75. The combination SG G2
(3) (4)
of the prisms produces dispersion without deviation. (S + G) (S + G)
The angle of the second prism should be :- 18. A thermocouple of negligible resistance produces
(1) 5° (2) 7° (3) 10° (4) 12° an e.m.f. of 40 µV/°C in the linear range of
13. A converging beam of rays is incident on a diverging temperature. A galvanometer of resistance 10 ohm
lens. Having passed through the lens the rays whose sensitivity is 1 µV/div, is employed with the
intersect at a point 15 cm from the lens on the thermocouple. The smallest value of temperature
opposite side. If the lens is removed the point where difference that can be detected by the system will
the rays meet will move 5 cm closer to the lens. The be :-
focal length of the lens is :- (1) 0.25°C (2) 0.5°C
(1) 5 cm (2) –10 cm (3) 1°C (4) 0.1°C
(3) 20 cm (4) –30 cm 19. Charge q is uniformly spread on a thin ring of radius
14. Three charges each +q are placed at the corners R. The ring rotates about its axis with a uniform
of an isosceles triangle ABC of sides BC and AC, frequency ƒ Hz. The magnitude of magnetic
2a. D and E are the mid points of BC and CA. The induction of the center of the ring is :-
work done in taking a charge Q from D to E is :-
µ 0 qƒ µ 0 qƒ µ 0q µ0 q
3qQ A (1) (2) (3) (4)
2pR 2R 2ƒR 2p ƒR
(1) 4p Î a
0
20. A short bar magnet of magnetic moment 0.4 J T–1 is
E
3qQ
placed in a uniform magnetic field of 0.16 T. The
(2) 8p Î a magnet is in stable equilibrium when the potential
0
B C energy is :-
D
(1) 0.064 J (2) –0.064 J
qQ
(3) 4p Î a (4) Zero (3) Zero (4) 0.082 J
0
21. A square loop, carrying a steady current I, is placed
15. The electric potential V at any point (x, y, z), all in in a horizontal plane near a long straight conductor
meters in space is given by V = 4x2 volt. The electric carrying a steady current I1 at a distance d from the
field at the point (1, 0, 2) in volt/meter, is :- conductor as shown in figure. The loop will
(1) 8 along negative X-axis experience :-
(2) 8 along positive X-axis
(3) 16 along negative X-axis I1
(4) 16 along positive X-axis d I
16. In the circuit shown in the figure, if the potential at
Z:\NODE02\B0B0-BA\NEET-UG_11 YRS(2010-2020)\ENG\2011\MAINS\01-PHY.P65
point A is taken to be zero, the potential at point
B is :-
R1
I
2V
D
B
1A (1) A net attractive force towards the conductor
R2 2W 2A (2) A net repulsive force away from the conductor
(3) A net torque acting upward perpendicular to
A the horizontal plane
1V 1A C 2A
(4) A net torque acting downward normal to the
(1) +1V (2) –1V (3) +2V (4) –2V horizontal plane
E
, ALLEN AIPMT Mains-2011 329
22. The r.m.s. value of potential difference V shown in 27. Out on the following which one is not a possible
the figure is :- energy for a photon to be emitted by hydrogen atom
V according to Bohr's atomic model ?
V0 (1) 0.65 eV (2) 1.9 eV
(3) 11.1 eV (4) 13.6 eV
O t
T/2 T 28. A zener diode, having breakdown voltage equal to
15 V, is used in a voltage regulator circuit shown
V0
(1) (2) V0 in figure. The current through the diode is :-
3
+ 250W
V0 V
(3) (4) 0
2 2
23. A coil has resistance 30 ohm and inductive 20V 15V 1kW
reactance 20 Ohm at 50 Hz frequency. If an ac –
source , of 200 volt, 100 Hz, is connected across
(1) 5 mA (2) 10 mA
the coil, the current in the coil will be :-
(3) 15 mA (4) 20 mA
(1) 2.0 A (2) 4.0 A
29. In the following figure, the diodes which are forward
20 biased, are :-
(3) 8.0 A (4) A
13
24. The threshold frequency for a photosensitive metal +10V R
is 3.3 × 1014 Hz. If light of frequency 8.2 ×1014 Hz (a) +5V R (b) –10V
is incident on this metal, the cut-off voltage for the
photoelectric emission is nearly :-
(1) 1 V (2) 2 V
(3) 3 V (4) 5 V (c) (d)
–12V R
25. An electron in the hydrogen atom jumps from R
excited state n to the ground state. The wavelength
–5V +5V
so emitted illuminates a photosensitive material
having work function 2.75 eV. If the stopping (1) (a), (b) and (d) (2) (c) only
potential of the photoelectron is 10 V, then the value
(3) (c) and (a) (4) (b) and (d)
of n is :-
30. Pure Si at 500 K has equal number of electron (ne)
(1) 2 (2) 3 and hole (nh) concentrations to 1.5 × 1016 m–3.
(3) 4 (4) 5 Doping by indium increases nh to 4.5 × 1022 m–3.
26. Two radioactive nuclei P and Q in a given sample The doped semiconductor is of :-
decay into a stable nucleus R. At time t = 0, number
(1) p- type having elecron concentratio ns
of P species are 4 N0 and that of Q are N0.
ne = 5 × 109 m–3
Half-life of P (for conversion to R) is 1 minute where
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as that of Q is 2 minutes. Initially there are no nuclei (2) n-type with electro n concen tration
of R present in the sample. When number of nuclei ne = 5 × 1022 m–3
of P and Q are equal, the number of nuclei of R
present in the sample would be :- (3) P-t ype with electro n co ncen trat ion
ne = 2.5 × 1010 m–3
(1) 2N0 (2) 3N0
(4) n-type with electro n concen tration
9N0 5N0
(3) (4) ne=2.5 × 1023 m–3
2 2
E
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