JNU Last 10 Years 2011-2021 Previous Question Papers with Answers
Question Paper Name: Paper I EHG 12th April 2019 Shift 1 S2
Subject Name: Paper I EHG
Creation Date: 2019-04-12 14:09:35
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Duration: 180
Total Marks: 360
Display Marks: Yes
Paper I
Group Number : 1
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Group Id : 416529177
Group Maximum Duration : 0
Group Minimum Duration : 180
Revisit allowed for view?: No
Revisit allowed for edit?: No
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Break time: 0
Group Marks: 360
Physics
Section Id : 416529325
Section Number : 1
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Section type : Online
Mandatory or Optional: Mandatory
Number of Questions: 30
Number of Questions to be attempted: 30
Section Marks: 120
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Display Number Panel: Yes
Group All Questions: No
Sub-Section Number: 1
Sub-Section Id: 416529465
Question Shuffling Allowed : Yes
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Question Number : 1 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
Which of the following combinations has the dimension of electrical resistance (e0 is the permittivity of vacuum and µ0 is the permeability of vacuum)?
Options:
1. µ0/e0
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2. v(µ0/e0)
3. v(e0/µ0)
4. e0/µ0
Question Number : 2 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
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The trajectory of a projectile near the surface of the earth is given as y=2x-9x². If it were launched at an angle ?0 with speed v0 then (g = 10 ms?²):
Options:
1. ?0 = sin?¹(1/v5) and v0 = 5/3 ms?¹
2. ?0 = cos?¹(1/v5) and v0 = 5/3 ms?¹
3. ?0 = sin?¹(2/v5) and v0 = 3/5 ms?¹
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4. ?0 = cos?¹(2/v5) and v0 = 3/5 ms?¹
Question Number : 3 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
A man (mass=50 kg) and his son (mass = 20 kg) are standing on a frictionless surface facing each other. The man pushes his son so that he starts moving at a speed of 0.70 ms?¹ with respect to the man. The speed of the man with respect to the surface is:
Options:
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1. 0.20 ms?¹
2. 0.28 ms?¹
3. 0.47 ms?¹
4. 0.14 ms?¹
Question Number : 4 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
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Correct Marks : 4 Wrong Marks : 1
A person of mass M is, sitting on a swing of length L and swinging with an angular amplitude ?0. If the person stands up when the swing passes through its lowest point, the work done by him, assuming that his centre of mass moves by a distance l (l<<L), is close to :
Options:
1. Mgl
2. Mgl (1-?0²/2)
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3. Mgl (1+?0²/2)
4. Mgl (1+?0²)
Question Number : 5 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
A circular disc of radius b has a hole of radius a at its centre (see figure). If the mass per unit area of the disc varies as s0/r then the radius of gyration of the disc about its axis passing through the centre is :
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Options:
1. (a+b)/2
2. v(a²+b²+ab)/2
3. (a+b)/3
4. v(a²+b²+ab)/3
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Question Number : 6 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
A uniform rod of length l is being rotated in a horizontal plane with a constant angular speed about an axis passing through one of its ends. If the tension generated in the rod due to rotation is T(x) at a distance x from the axis, then which of the following graphs depicts it most closely ?
Options:
1. T(x)
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2. T(x)
3. T(x)
4. T(x)
Question Number : 7 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
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A shell is fired from a fixed artillery gun with an initial speed u such that it hits the target on the ground at a distance R from it. If t1 and t2 are the values of the time taken by it to hit the target in two possible ways, the product t1t2 is:
Options:
1. R/2g
2. R/g
3. 2R/g
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4. R/4g
Question Number : 8 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
A brass wire of 1 mm radius is hung from the ceiling. A small mass, M is hung from the free end of the wire. When the wire is cooled down from 40°C to 20°C it regains its original length of 0.2 m. The value of M is close to :
(Coefficient of linear expansion and Young's modulus of brass are 10?5/°C and 10¹¹ N/m², respectively; g=10ms?²)
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Options:
1. 9 kg
2. 1.5 kg
3. 0.9 kg
4. 0.5 kg
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Question Number : 9 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
When M1 gram of ice at -10°C (specific heat = 0.5 cal g?¹°C?¹) is added to M2 gram of water at 50°C, finally no ice is left and the water is at 0°C. The value of latent heat of ice, in cal g?¹ is:
Options:
1. (5M1/M2) - 50
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2. (50M2/M1) - 5
3. (5M2/M1) - 5
4. (50M2/M1) - 5
Question Number : 10 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
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An ideal gas is taken through the cyclic process abca as shown in figure. The change in the internal energy of the gas along the path ca is -180 J. The gas absorbs 250 J of heat along the path ab and 60 J along the path bc. The work done by the gas along the path abc is:
Options:
1. 100 J
2. 120 J
3. 130 J
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4. 140 J
Question Number : 11 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
Two moles of helium gas is mixed with three moles of hydrogen molecules (taken to be rigid). What is the molar specific heat of mixture at constant volume? (R=8.3 J/mol K)
Options:
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1. 15.7 J/mol K
2. 17.4 J/mol K
3. 19.7 J/mol K
4. 21.6 J/mol K
Question Number : 12 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
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Correct Marks : 4 Wrong Marks : 1
An electromagnetic wave is represented by y(x,t) = Asin(kx-?t+F). Its snapshot at t=0 is given in the figure. For this wave, the phase F is:
Options:
1. 0
2. p/2
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3. -p/2
4. p
Question Number : 13 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
A submarine (A) travelling at 18 km/hr is being chased along the line of its velocity by another submarine (B) travelling at 27 km/hr. B sends a sonar signal of 500 Hz to detect A and receives a reflected sound of frequency ?. The value of ? is close to : (Speed of sound in water = 1500 ms?¹)
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Options:
1. 502 Hz
2. 499 Hz
3. 504 Hz
4. 507 Hz
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Question Number : 14 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
A point dipole p = p0x^ is kept at the origin. The potential and electric field due to this dipole on the y-axis at a distance d are, respectively: (Take V=0 at infinity)
Options:
1. 0, p/(4pe0d³)
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2. -p/(4pe0d²), -p/(4pe0d³)
3. 0, -p/(4pe0d³)
4. p/(4pe0d²), p/(4pe0d³)
Question Number : 15 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
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In the figure is a shell made of a conductor. It has inner radius a and outer radius b, and carries charge Q. At its centre is a dipole P as shown. In this case :
Options:
1. surface charge density on the inner surface of the shell is zero everywhere
2. surface charge density on the outer surface depends on |P|
3. surface charge density on the inner surface is uniform and equal to (Q/2)/(4pa²)
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4. electric field outside the shell is the same as that of a point charge at the centre of the shell
Question Number : 16 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
Two identical parallel plate capacitors, of capacitance C each, have plates of area A, separated by a distance d. The space between the plates of the two capacitors, is filled with three dielectrics, of equal thickness and dielectric constants K1, K2 and K3. The first capacitor is filled as shown in fig. I, and the second one is filled as shown in fig II. If these two modified capacitors are charged by the same potential V, the ratio of the energy stored in the two, would be (E1 refers to capacitor (I) and E2 to capacitor (II)) :
Options:
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1. E1/E2 = (9K1K2K3)/((K1+K2+K3)(K2K3+K3K1+K1K2))
2. E1/E2 = ((K1+K2+K3)(K2K3+K3K1+K1K2))/(9K1K2K3)
3. E1/E2 = (K1K2K3)/((K1+K2+K3)(K2K3+K3K1+K1K2))
4. E1/E2 = ((K1+K2+K3)(K2K3+K3K1+K1K2))/(K1K2K3)
Question Number : 17 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
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Correct Marks : 4 Wrong Marks : 1
Chnt's law, a student connects voltmeter across the battery as, shown in the figure. The measured voltage is plotted as a function of the current, and the following graph is obtained : If V0 is almost zero, identify the correct statement:
Options:
1. The value of the resistance R is 1.5 O
2. The emf of the battery is 1.5 V and its internal resistance is 1.5 O
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3. The potential difference across the battery is 1.5 V when it sends a current of 1000 mA
4. The emf of the battery is 1.5 V and the value of R is 1.5 O
Question Number : 18 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
The resistive network shown below is connected to a D.C. source of 16 V. The power consumed by the network is 4 Watt. The value of R is:
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Options:
1. 6O
2. 8O
3. 1O
4. 16 O
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Question Number : 19 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
A thin ring of 10 cm radius carries a uniformly distributed charge. The ring rotates at a constant angular speed of 40 rad s?¹ about its axis, perpendicular to its plane. If the magnetic field at its centre is 3.8 x 10? T, then the charge carried by the ring is close to (µ0= 4p×10?7N/A²).
Options:
1. 4×10?5C
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2. 2×10?6C
3. 7×10?6C
4. 3×10?5C
Question Number : 20 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
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A galvanometer of resistance 100 O has 50 divisions on its scale and has sensitivity of 20 µ.?/division. It is to be converted to a voltmeter with three ranges, of 0-2V, 0-10 V and 0-20 V. The appropriate circuit to do so is:
Options:
1. R1 = 1900 O, R2 = 9900 O, R3 = 19900 O
2. R1 = 19900 O, R2 = 9900 O, R3 = 1900 O
3. R1 = 1900 O, R2 = 8000 O, R3 = 10000 O
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4. R1 = 2000 O, R2 = 8000 O, R3 = 10000 O
Question Number : 21 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
A magnetic compass needle oscillates 30 times per minute at a place where the dip is 45°, and 40 times per minute where the dip is 30°. If B1 and B2 are respectively the total magnetic field due to the earth at the two places, then the ratio B1/B2 is best given by :
Options:
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1. 0.7
2. 1.8
3. 2.2
4. 3.6
Question Number : 22 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
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Correct Marks : 4 Wrong Marks : 1
The figure shows a square loop L of side 5 cm which is connected to a network of resistances. The whole setup is moving towards right with a constant speed of 1 cms?¹. At some instant, a part of L is in a uniform magnetic field of 1 T, perpendicular to the plane of the loop. If the resistance of L is 1.7 O, the current in the loop at that instant will be close to :
Options:
1. 60 µ.?
2. 115 µ?
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3. 150 µ.?
4. 170 µ.?
Question Number : 23 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
An electromagnetic wave is represented by the electric field E=E0sin[?t + (6y-8z)]. Taking unit vectors in x, y and z directions to be î,j,k^, the direction of propagation s, is:
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Options:
1. s = (3î - 4j)/5
2. s = (-3j + 4k^)/5
3. s = (-4k^ + 3j)/5
4. s = (4j - 3k^)/5
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Question Number : 24 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
A concave mirror has radius of curvature of 40 cm. It is at the bottom of a glass that has water filled up to 5 cm (see figure). If a small particle is floating on the surface of water, its image as seen, from directly above the glass, is at a distance d from the surface of water. The value of d is close to: (Refractive index of water = 1.33)
Options:
1. 11.7 cm
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2. 8.8 cm
3. 6.7 cm
4. 13.4 cm
Question Number : 25 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
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In a double slit experiment, when a thin film of thickness t having refractive index µ is introduced in front of one of the slits, the maximum at the centre of the fringe pattern shifts by one fringe width. The value of t is (? is the wavelength of the light used):
Options:
1. ?/(2(µ-1))
2. 2?/(µ-1)
3. ?/(µ-1)
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4. ?/(2µ-1)
Question Number : 26 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
The value of numerical aperature of the objective lens of a microscope is 1.25. If light of wavelength 5000 Å is used, the minimum separation between two points, to be seen as distinct, will be :
Options:
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1. 0.48 µm
2. 0.12 µm
3. 0.38 µm
4. 0.24 µm
Question Number : 27 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
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Correct Marks : 4 Wrong Marks : 1
Stopping potential V0 (in volt) as a function of frequency (?) for a sodium emitter, is shown in the figure. The work function of sodium, from the data plotted in the figure, will be : (Given: Planck's constant (h) = 6.63×10?³4 Js, electron charge e = 1.6 × 10?¹? C)
Options:
1. 1.66 eV
2. 1.82 eV
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3. 1.95 eV
4. 2.12 eV
Question Number : 28 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
An excited He? ion emits two photons in succession, with wavelengths 108.5 nm and 30.4 nm, in making a transition to ground state. The quantum number n, corresponding to its initial excited state is (for photon of wavelength ?, energy E = 1240 eV/?(in nm) ):
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Options:
1. n=7
2. n=6
3. n=5
4. n=4
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Question Number : 29 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
The truth table for the circuit given in the fig. is:
Options:
1. A B Y
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0 0 1
0 1 1
1 0 0
1 1 0
2. A B Y
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0 0 0
0 1 0
1 0 1
1 1 1
3. A B Y
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0 0 1
0 1 0
1 0 0
1 1 0
4. A B Y
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0 0 1
0 1 1
1 0 1
1 1 1
Question Number : 30 Question Type : MCQ Option Shuffling: Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
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Correct Marks : 4 Wrong Marks : 1
The transfer characteristic curve of a transistor, having input and output resistance 100 O and 100 kO respectively, is shown in the figure. The Voltage and Power gain, are respectively :
Options:
1. 5×104, 5×106
2. 5×104, 2.5 × 106
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3. 5×104, 5×105
4. 2.5×104, 2.5 × 106
Section Id : 416529326
Section Number : 2
Section type : Online
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Mandatory or Optional: Mandatory
Number of Questions: 30
Number of Questions to be attempted: 30
Section Marks: 120
Display Number Panel: Yes
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Group All Questions: No
Sub-Section Number: 1
Sub-Section Id: 416529466
Question Shuffling Allowed : Yes
Question Number : 31 Question Type : MCQ Option Shuffling : Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
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Correct Marks : 4 Wrong Marks : 1
Which of the following statements is not true about RNA :
Options:
1. It is present in the nucleus of the cell
2. It has always double stranded a-helix structure
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3. It controls the synthesis of protein
4. It usually does not replicate
Question Number : 32 Question Type : MCQ Option Shuffling : Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
The increasing order of the pK? of the following compound is:
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Options:
1. (A) < (C) < (D) < (B)
2. (B) < (D) < (C) < (A)
3. (B) < (D) < (A) < (C)
4. (C) < (A) < (D) < (B)
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Question Number : 33 Question Type : MCQ Option Shuffling : Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
The major product of the following reaction is:
Options:
1.
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2.
3.
4.
Question Number : 34 Question Type : MCQ Option Shuffling : Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
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Glucose and Galactose are having identical configuration in all the positions except position.
Options :
1. C-2
2. C-3
3. C-4
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4. C-5
Question Number : 35 Question Type : MCQ Option Shuffling : Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 4 Wrong Marks : 1
The major product of the following addition reaction is
Options :
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1.
2.
3.
4.
Question Number : 36 Question Type : MCQ Option Shuffling : Yes Display Question Number : Yes Single Line Question Option : No Option Orientation : Vertical
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Correct Marks : 4 Wrong Marks : 1
The major products of the following reaction are:
Options :
1. and Methanol
2. and Formic acid
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3. and Methanol
4
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