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  #2  
16th October 2014, 08:27 AM
Super Moderator
 
Join Date: Apr 2013
Re: IIT Entrance Exam Previous Papers

As per your request here I am sharing the last year question paper of IIT Entrance Exam

Which one of the following properties is not shown by NO?
(1) It combines with oxygen to form nitrogen dioxide
(2) It’s bond order is 2.5
(3) It is diamagnetic in gaseous state
(4) It is a neutral oxide
Sol. 3

Consider separate solutions of 0.500 M C2H5OH(aq), 0.100 M Mg3(PO4)2(aq), 0.250 M KBr(aq) and 0.125 M Na3PO4(aq) at 25oC. Which statement is true about these solutions, assuming all salts to be strong electrolytes?
(1) 0.125 M Na3PO4(aq) has the highest osmotic pressure.
(2) 0.500 M C2H5OH(aq) has the highest osmotic pressure.
(3) They all have the same osmotic pressure.
(4) 0.100 M Mg3(PO4)2(aq) has the highest osmotic pressure.
Sol. 3







Rest of the Questions are attached in below file which is free of cost
Attached Files
File Type: pdf IIT Entrance Exam Question Paper.pdf (481.7 KB, 96 views)
  #3  
29th May 2015, 12:33 PM
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Re: IIT Entrance Exam Previous Papers

Hi I want the question paper of IIT JEE entrance exam so will you please provide me?
  #4  
29th May 2015, 12:36 PM
Super Moderator
 
Join Date: Apr 2013
Re: IIT Entrance Exam Previous Papers

Ok, as you want the question paper of IIT JEE entrance exam so here I am providing you.

IIT JEE entrance exam question paper
1. Sun releases energy by the process of
A. nuclear fusion B. nuclear
disintegration C. nuclear fission D. spontaneous
combustion
2. The number of atoms per unit cell in a sc, bcc, and fcc are
A. 1, 2 and 4 respectively B. 8, 6 and 10 respectively
C. 1, 4 and 2 respectively D. 2, 4 and 1 respectively
3. In a diode, at saturation current, the plate resistance is
A. zero B. constant and finite C. infinite D. variable but finite
4. An n-type and a p-type silicon semi-conductor can be obtained by doping pure silicon with
A. sodium and magnesium respectively B. phosphorous and boron respectively
C. indium and sodium respectively D. boron and arsenic respectively
5. When the plate voltage of a triode is 150 V, its cut off voltage is -5 V. On increasing the plate
voltage to 200 V, the cut off voltage can be
A. -4.5V B. -5.0V C. + 2.3 V D. -6.06 V
6. In a diode vacuum tube, the plate current is 5 mA when the plate voltage is 160 V. A grid is
introduced between the plate and cathode and a voltage of -2 V is applied to it. The plate current
then become
A. 20 mA B. 10 mA C. 4mA D. 7.5mA
7. A long spring is stretched by 2cm. Its
potential energy is V. If the spring is stretched
by 10cm, its potential energy would be
A. V/25 B. V/5 C. 5V D. 25V
8. The length of a rod as measured by an observer moving with respect to it is half of its proper
length. The speed of the observer with respect to rod is
A. 3/2 c ms-1 B. c/2 ms-1 C. (√3)/2 c ms-1 D. 1/√2 c ms-1
9. A + µ -meson with a proper half-life of 1.8 x 10-6 s is moving with a speed of 0.9 c with
respect to an earth observer. The half-life of this µ -meson according to an observer sitting on it
is
A. 1.8 x 10-6 s B. 1.8 x √0.19 x 10-6 s C. 1.8/√0.19 x 10-6 s D. 1.8 x 0.19 x 106 s
10. The mass per nucleon in an ordinary hydrogen atom is
A. l/l6th mass per nucleon in an oxygen atom
B. slightly greater than the mass per nucleon in an oxygen atom
C. the same as mass per nucleon in an oxygen atom
D. slightly smaller than the mass per nucleon in an oxygen atom
11. Consider the following nuclear reaction
2He4 + ZXA = Z+2YA+3 + W
What particle does W denote ?
A. electron B. positron C. proton D. neutron
12. The function of graphite and the control rods in a nuclear reactor are
A. to produce neutrons and to shield the reactor
B. to slow down the neutrons and to absorb the excess neutrons respectively
C. to absorb the excess neutrons and to shield the reactor respectively
D. to absorb neutrons and to reduce the energy of the neutrons respectively
13. In the first observed nuclear reaction, 7N14 was bombarded with α -particles. The reaction
could be represented as
7N14 + 2He4 = X + 1H1
The element in this reaction is
A. 8O17 B. 8F17 C. 8N17 D. 8Ne17
14. In a Bucherer's experiment, the specific charge of some β particles is found to be 1/4th of the
value determined by J.J. Thomson. The speed of these β particles is
A. √ 5/4 c B. √ 15/4 c C. 1/4 c D. c
15. When the mass is rotating in a plane about a
fixed point, its angular momentum is directed
along
A. the radius B. the tangent to orbit
C. line at an angle of
45° to the plane of
rotation
D. the axis of rotation
16. A photo-cell with a constant p.d. of V volts across it, is illuminated by a point source from a
distance 25 cm. When the source is moved to a distance of 1 m, the electrons emitted by the
photo-cell
A. carry 1/4th their previous energy B. are 1/16th as numerous as before
C. are 1/4th as numerous as before D. carry 1/4th their previous momentum
17. A convex lens of focal length 40 cm is in contact with a concave lens of focal length 25 cm.
The power of combination is
A. -1.5D B. -6.5D C. 1.5 D D. 6.5 D
18. A prism splits a beam of white light into its seven constituent colours. This is so because
A. phase of different colour is different B. amplitude of different colours is different
C. energy of different colours is different D. velocity of different colours is different
19. A prism has a refracting angle of 60° when a ray of light is incident on its face at 45°, it
suffers minimum deviation. The angle of minimum deviation is
A. 30° B. 60° C. 45° D. 90°
20. A car driver sees an image of a bus in his
driving mirror, which has a radius of curvature
of 4 m. The bus which is 10 m long, is parallel
to and following the car in front of the bus 18 m
from the mirror. The apparent length of the bus
as seen in the mirror is
A. 700 mm B. 670 mm C. 800 cm D. 800 mm
21. A single slit of width d is placed in the path of a beam of wavelength λ . The angular width
of principal maximum obtained is
A. d/λ B. λ /d C. 2λ /d D. 2d/λ
22. A closed tube, partly filled with a liquid & set horizontal, is rotated about a vertical axis
passing through its centre. In the process, the moment of inertia of the system about its axis
would
A. increase always B. decrease always
C. remain constant D. increase if tube is less than half filled,
decrease otherwise
23. In an A.C. circuit the instantaneous current through and voltage across a capacitor are
represented as I = I0 sin (ω t+ π /4) and v= V0 sin (ω t+ π /8) respectively. The current leads the
voltage by
A. π /4 B. 3π /8 C. π /2 D. π /8
24. A transformer having 2100 turns in the primary and 4200 turns in the secondary has an a.c.
source of 120 V, 10 A connected to its primary. Then the secondary voltage and current are
A. 240 V and 5 A B. 120 V and 10 A C. 240 V and 10 A D. 120 V and 20 A
25. When a magnet falls through a metal ring, acceleration
through the metal ring during the free falls is
A. less than g throughout its fall
B. less than g when it is above the ring and more than g
when it is below the ring
C. more than g throughout its fall
D. more than g when it is above the ring and less than g
when it is below the ring
26. A copper rod is suspended in a non-homogeneous magnetic field region. The rod when in
equilibrium, will then align itself
A. in the region where the magnetic field is strongest
B. in the direction in which it was originally suspended
C. in the region where the magnetic field is weakest and parallel to the direction of the magnetic
field there
D. none of these
27. The substance which shows permanent magnetism is called
A. anti-ferromagnetic B. paramagnetic C. diamagnetic D. ferromagnetic
28. A magnetic substance is heated to 800 K and then cool down slowly to 300 K, then it
A. retains its magnetism B. retains its magnetism below curie points
C. does not retain magnetism D. none of these
29. Two heater wires of equal length are first
connected in series and then in parallel. The
ratio of heat produced in the two cases is
A. 2 : 1 B. 1 : 2 C. 4 : 1 D. 1 : 4
30. A galvanometer with a coil resistance of 100Ω gives a full-scale deflection when a current of
1 mA is passed through it. The resistance of the shunt needed to convert this galvanometer into
an ammeter 5 of range 10 A is nearly
A. 0.01Ω B. 0.001Ω C. 0.1Ω D. 0.099Ω
31. The resistance of a 50 cm long wire is 10Ω . The wire is stretched to uniform wire of length
100 cm. The resistance now will be
A. 15Ω B. 30Ω C. 20Ω D. 40Ω
32. In the given circuit, the currents i, j, and k are in the ratio
A. 1:2:3 B. 3:2:1
C. 2:1:3 D. 3:1:2
33. A conducting sphere of radius R is given a charge Q. Consider three points B at the surface, A
at centre and C at a distance R/2 from the center. The electric potential at these points are such
that
A. VA = VB = VC B. VA = VB ≠ VC C. VA ≠ VB ≠ VC D. VA ≠ VB = VC
34. The mass of a proton is 1847 times that of an electron.
An electron and a proton are projected into a uniform
electric field in a direction of right angles to the direction of
the field with the same initial kinetic energy. Then
A. both the trajectories will be equally curved
B. the proton trajectory will be less curved than the electron
trajectory
C. the electron trajectory will be less curved than the proton
trajectory
D. the relative curving of the trajectories will be dependent
on the value of initial kinetic energy
35. The wavelength of maximum radiation from the moon is 14 x 10-6 m. If the value of the
constant in Wein's displacement law is 0.00293 mK, the surface temperature of moon is
A. 207 K B. 146 K C. 227 K D. 103.5 K
36. A given mass of gas is subjected to an external pressure of 0.5 x 1010 N/m2. If K = 1010Nm-2,
the ratio of the density before and after applying the pressure is
A. 1 : 1 B. 1 : 2 C. 2 : 1 D. 1 : 4
37. The heat reservoir of an ideal Carnot engine is at 800 K and its sink is at 400 K. The amount
of heat taken in it in one second to produce useful mechanical work at the rate of 750 K is
A. 2250 J B. 1125 J C.1500 J D. 750 J
38. A Carnot engine, with its cold body at 17°C
has 50% efficiency. If the temperature of its hot
body is now increased by 145°C, the efficiency
becomes
A. 55% B. 60% C. 40% D. 45%
39. A wire of length 1m increases in length by 10-4m when heated through 102 degree celsius.
The coefficient of volume expansion of the wire is
A. 2 x 10-6 B. 1 x 10-6 C. 3 x 10-6 D. 4 x 10-6
40. The pitch of a sound wave is related to its
A. frequency B. amplitude C. velocity D. beats
41. A mass m is hung to a string. After some time, it was observed that mass m moves up from
its initial position; this is due to
A. decrease in
temperature
B. increase in
temperature
C. the statement is
wrong D. change in humidity
42. A light spring of force constant 8 Nm-1 is cut into two equal halves and the two are connected
in parallel; the equivalent force constant of the system is
A. 16 Nm-1 B. 32 Nm-1 C. 8 Nm-1 D. 24 Nm- 1
43. A light spring of constant k is cut into two equal parts. The spring constant of each part is
A. k B. 2k C. k/2 D. 4k
44. A wave equation which gives the displacement along ydirection
is given by y = 10-4 sin (60t + x) where x and y are
in meters and t is time in seconds. This represents a wave
A. travelling with a velocity of 300 ms-l in the -ve xdirection
B. of wavelength π meters
C. of frequency 30/π hertz
D. of amplitude 104 meter travelling along the positive xdirection
45. The periodic times T of a simple pendulum are observed for different length l. If a graph of
log T against log l is plotted, the slope of the graph is
A. 2 B. 1/2
C. √ 2 D. 1/√ 2
46. Ordinarily, the value of coefficient of restitution varies from
A. 0 to1 B. 0 to 0.5 C. –1 to +1 D. -0.5 to +0.5
47. In a gravitational field, if a body is bound with earth, then total mechanical energy it has is
A. a +ve value B. a zero value C. a -ve value D. K.E. less than P.E.
48. The mass of a planet is twice the mass of
earth and diameter of the planet is thrice the
diameter of the earth, then the acceleration due
to gravity on the planet's surface is
A. g/2 B. 2g C. 2g/9 D. 3g/√ 2
49. A stationary bomb explodes into two parts of masses 3 kg and 1 kg. The total K.E. of the two
parts after explosion is 2400J. The K.E. of the smaller part is
A 600 J B 1800 J C 1200 J D 2160 J
50. In a perfectly elastic collision
A. both momentum and K.E. are conserved B. only momentum is conserved
C. only K.E. is conserved D. neither K.E. nor momentum is conserved
For more questions here is the attachment;
Attached Files
File Type: pdf IIT JEE entrance exam question paper.pdf (231.9 KB, 41 views)


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