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Neet 2011 question answer

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1. Exam (elaborations) - Neet mock test
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ALLEN AIPMT Pre-2011 343

1. Photoelectric emission occurs only when the 8. The potential energy of a system increases if work
incident light has more than a certain minimum :- is done :-
(1) Power (2) Wavelength (1) Upon the system by a nonconservative force
(3) Intensity (4) Frequency (2) By the system against a conservative force
2. A current carrying closed loop in the form of a right (3) By the system against a nonconservative force
angle isosceles triangle ABC is placed in a uniform (4) Upon the system by a conservative force
magnetic field acting along AB. If the magnetic force 9. A charge Q is enclosed by a Gaussian spherical
r
on the arm BC is F , the force on the arm AC is :- surface of radius R. If the radius is doubled, then
the outward electric flux will :-
A (1) Increase four times (2) Be reduced to half
(3) Remain the same (4) Be doubled
10. The power obtained in a reactor using U235
disintegration is 1000 kW. The mass decay of U235
per hour is :-
B C
(1) 10 microgram (2) 20 microgram
r r r r (3) 40 microgram (4) 1 microgram
(1) - 2 F (2) - F (3) F (4) 2F
11. A radioactive nucleus of mass M emits a photon
3. A particle moves in a circle of radius 5cm with of frequency n and the nucleus recoils. The recoil
constant speed and time period 0.2 p s. The energy will be :-
acceleration of the particle is :- (1) Mc2 – hn (2) h2nMc2
(1) 15 m/s2 (2) 25 m/s2 (3) Zero (4) hn
2
(3) 36 m/s (4) 5 m/s2
12. The electric and the magnetic field, associated with
4. Which of the following is not due to total internal
an e.m. wave, propagating along the +z-axis, can
reflection ?
be represented by :-
(1) Working of optical fibre
r r
(2) Difference between apparent and real depth of (1) éë E = E0ˆi,B = B 0ˆj ùû
a pond
r r
(3) Mirage on hot summer days ˆ = B ˆi ù
(2) éë E = E 0k,B 0 û
(4) Brilliance of diamond
5. A missile is fired for maximum range with an initial r r
(3) éë E = E0ˆj,B = B 0ˆi ùû
velocity of 20 m/s. If g = 10 m/s2, the range of
the missile is :- r r
(4) éë E = E 0ˆj,B = B0kˆ ùû
(1) 40 m (2) 50 m
(3) 60 m (4) 20 m 13. During an isothermal expansion, a confined ideal
6. The wavelength of the first line of Lyman series gas does 150 J of work against its surroundings.
This implies that :-
for hydrogen atom is equal to that of the second
line of Balmer series for a hydrogen like ion. The (1) 150 J of heat has been removed from the gas
Z:\NODE02\B0B0-BA\NEET-UG_11 YRS(2010-2020)\ENG\2011\PRE\01-PHY.P65

atomic number Z of hydrogen like ion is :- (2) 300 J of heat has been added to the gas
(1) 3 (2) 4 (3) No heat is transferred because the process is
(3) 1 (4) 2 isothermal
7. The half life of a radioactive isotope 'X' is 50 years. (4) 150 J of heat has been added to the gas
It decays to another element 'Y' which is stable. The 14. Two waves are represen ted by t he
two elements 'X' and 'Y' were found to be in the equations y1 = asin (wt + kx + 0.57) m and
ratio of 1 : 15 in a sample of a given rock. The y2 = a cos (wt + kx) m where x is in meter and
age of the rock was estimated to be :- t in sec. The phase difference between them is :-
(1) 150 years (2) 200 years (1) 1.0 radian (2) 1.25 radian
(3) 250 years (4) 100 years (3) 1.57 radian (4) 0.57 radian
E

,344 AIPMT Pre-2011 ALLEN
15. The instantaneous angular position of a point on 21. A body is moving with velocity 30 m/s towards east.
a rotating wheel is given by the equation After 10 seconds its velocity becomes 40 m/s
q (t) = 2t3 – 6t2 . The torque on the wheel becomes towards north. The average acceleration of the
zero at :- body is :-
(1) t = 1s (2) t = 0.5 s (1) 1 m/s2 (2) 7 m/s2
(3) t = 0.25 s (4) t = 2s
(3) 7 m / s2 (4) 5 m/s2
16. A boy standing at the top of a tower of 20 m height
drops a stone. Assuming g = 10 ms –2, the velocity 22. Fusion reaction takes place at high temperature
with which it hits the ground is :- because :-

(1) 10.0 m/s (2) 20.0 m/s (1) Nuclei break up at high temperature

(3) 40.0 m/s (4) 5.0 m/s (2) Atoms get ionised at high temperature

17. The moment of inertia of a thin uniform rod of mass (3) Kinetic energy is high enough to overcome the
M and length L about an axis passing through its coulomb repulsion between nuclei
midpoint and perpendicular to its length is I0. Its (4) Molecules break up at high temperature
moment of inertia about an axis passing through
one of its ends and perpendicular to its length is:- 23. A body projected vertically from the earth reaches
a height equal to earth's radius before returning to
(1) I0 + ML2/2 (2) I0 + ML2/4 the earth. The power exerted by the gravitational
(3) I0 + 2ML2 (4) I0 + ML2 force is greatest :-

18. A nucleus nmX emits one a particle and two b – (1) At the highest position of the body
particles. The resulting nucleus is :- (2) At the instant just before the body hits the earth

(1) m -6
(2) m -6 (3) It remains constant all through
n -4 Z nZ
(4) At the instant just after the body is projected
m -4 m -4
(3) nX
(4) n -2 Y
1
24. The dimensions of ( m0 Î0 ) - 2 are :-
19. A parallel plate condenser has a uniform electric
field E(V/m) in the space between the plates. If the
1 1
distance between the plates is d(m) and area of each -
(1) [ L2 T 2 ] (2) [L–1T]
plate is A(m2) the energy (joules) stored in the
condenser is :-
1 1
-
(3) [LT–1] (4) [ L 2 T 2 ]
1
(1) E2Ad/Î0 (2) Î0 E2
2 25. An ac voltage is applied to a resistance R and an
inductor L in series. If R and the inductive reactance
1 are both equal to 3W, the phase difference between
(3) Î0EAd (4) Î0 E 2 Ad
2 the applied voltage and the current in the circuit
is :-
20. A planet moving along an elliptical orbit is closest
Z:\NODE02\B0B0-BA\NEET-UG_11 YRS(2010-2020)\ENG\2011\PRE\01-PHY.P65

to the sun at a distance r1 and farthest away at a (1) p/6 (2) p/4 (3) p/2 (4) Zero
distance of r2. If v1 and v2 are the linear velocities 26. A transistor is operated in common emitter
configuration at VC = 2V such that a change in the
v1
at these points respectively, then the ratio v is:- base current from 100 µA to 300µA produces a
2
change in the collector current from 10 mA to
(1) (r1/r2)2 (2) r2/r1 20 mA. The current gain is :-

(3) (r2/r1)2 (4) r1/r2 (1) 50 (2) 75
(3) 100 (4) 25

E

, ALLEN AIPMT Pre-2011 345
27. In forward biasing of the p–n junction :- 31. In an ac circuit an alternating voltage

(1) The positive terminal of the battery is connected e = 200 2 sin 100 t volts is connected to a
to p–side and the depletion region becomes capacitor of capacity 1µF. The r.m.s. value of the
thick current in the circuit is :-
(2) The positive terminal of the battery is connected (1) 10 mA (2) 100 mA
to n-side and the depletion region becomes thin (3) 200 mA (4) 20 mA
(3) The positive terminal of the battery is connected
32. A current of 2 A flows through a 2W resistor when
to n-side and the depletion region becomes
connected across a battery. The same battery
thick
supplies a current of 0.5A when connected across
(4) The positive terminal of the battery is connected
a 9W resistor The internal resistance of the battery
to p-side and the depletion region becomes thin
is:
28. There are four light-weight rod samples A,B,C D
separately suspended by threads. A bar magnet is (1) 0.5 W (2)1/3W
slowly brought near each sample and the following
(3) 1/4 W (4) 1W
observations are noted :-
(i) A is feebly repelled 33. A particle of mass m is released from rest and
(ii) B is feebly attracted follows a parabolic path as shown Assuming that
the displacement of the mass from the origin is
(iii) C is strongly attracted
small, which graph correctly depicts the position
(iv) D remains unaffected of the particle as a function of time ?
Which one of the following is true ?
V(x) m
(1) B is of a paramagnetic material
(2) C is of a diamagnetic material (x)
O
(3) D is of a ferromagnetic material
(4) A is of a non-magnetic material x(t) x(t)

29. A person of mass 60 kg is inside a lift of mass 940 t t
kg and presses the button on control panel. The (1) 0 (2) 0
lift starts moving upwards with an acceleration
1.0 m/s2. If g = 10 ms–2, the tension in the
supporting cable is :- x(t) x(t)
(1) 8600 N (2) 9680 N
t t
(3) 11000 N (4) 1200 N (3) 0 (4) 0
30. Symbolic representation of four logic gates are
shown as :-
34. If power dissipated in the 9-W resistor in the circuit
(i) (ii) shown is 36 Watt, the potential difference across
Z:\NODE02\B0B0-BA\NEET-UG_11 YRS(2010-2020)\ENG\2011\PRE\01-PHY.P65

the 2-W resistor is :
9W
(iii) (iv) (1) 4 Volt
6W

Pick out which ones are for AND, NAND and NOT (2) 8 Volt
gates, respectively :-
(3) 10 Volt
(1) (ii), (iii) and (iv) (2) (iii), (ii) and (i) V 2W
(3) (iii), (ii) and (iv) (4) (ii), (iv) and (iii) (4) 2 Volt

E

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