PHYSICS- PAGE 2
1. In P-type semiconductor, the minority carriers of charge are
(a). holes
(b). electrons
(c). electrons and holes
(d). neutrons
Answer: electrons
2. Regarding the atom of a chemical element, the magnetic quantum number refers to
(a). orientation
(b). shape
(c). size
(d). spin
Answer: orientation
3. A solar water heater can not be used to get hot water on
(a). A sunny day
(b). A hot day
(c). A cloudy day
(d). A windy day
Answer: Option-C
4. The least distance of distinct vision for a young adult with a normal vision is about
(a). 25 m
(b). 2.5 cm
(c). 2.5 m
(d). 25 cm
Answer: Option-D
30. During amplification of sound signal which of the following quantity change
(a). Amplitude
(b). Frequency
(c). Velocity
(d). Wave length
Answer: Option-A
5. Four bulbs have the following specifications, 60w at 220 v, 100w at 220v, 240w at 220v, 200w at 220v The filament of which bulb has higher resistance
(a). 60w at 220v
(b). 100w at 220v
(c). 240w at 220v
(d). 200w at 220v
Answer: Option-A
6. Energy generation in stars is mainly due to
(a). Fusion of light nuclei
(b). Chemical reaction
(c). Fission of heavy nucleus
(d). Burning of coal
Answer: Option-A
7. Which of the following device not working based on principle of electromagnetic induction
(a). Dynamo
(b). Microphone
(c). Transformer
(d). Loud speaker
Answer: Option-D
8. Which electronic component not included in Integrated circuit
(a). Capacitor
(b). Inductor
(c). Resistor
(d). Transistor
Answer: Option-B
9. V/T is a constant. This is the mathematical expression of
(a). Charle's law
(b). Boyle's law
(c). Avogadro's law
(d). Gay Lussac's law
Answer: Option-A
10. What is the purpose of the spring in the galvanometer?
(A) To ensure a uniform force on the coil
(B) To complete the circuit through the coil
(C) To counteract the motor effect on the coil
(D) To increase the magnetic flux through the coil
Answer: Option- C
11. Pressure cookers are based on the principle that
a. The boiling point of liquid increases with increase in pressure
b. The boiling point of liquid decreases with increase in pressure
c. The boiling point of liquid remains constant
d. None of the above
Answer: A
(a). holes
(b). electrons
(c). electrons and holes
(d). neutrons
Answer: electrons
2. Regarding the atom of a chemical element, the magnetic quantum number refers to
(a). orientation
(b). shape
(c). size
(d). spin
Answer: orientation
3. A solar water heater can not be used to get hot water on
(a). A sunny day
(b). A hot day
(c). A cloudy day
(d). A windy day
Answer: Option-C
4. The least distance of distinct vision for a young adult with a normal vision is about
(a). 25 m
(b). 2.5 cm
(c). 2.5 m
(d). 25 cm
Answer: Option-D
30. During amplification of sound signal which of the following quantity change
(a). Amplitude
(b). Frequency
(c). Velocity
(d). Wave length
Answer: Option-A
5. Four bulbs have the following specifications, 60w at 220 v, 100w at 220v, 240w at 220v, 200w at 220v The filament of which bulb has higher resistance
(a). 60w at 220v
(b). 100w at 220v
(c). 240w at 220v
(d). 200w at 220v
Answer: Option-A
6. Energy generation in stars is mainly due to
(a). Fusion of light nuclei
(b). Chemical reaction
(c). Fission of heavy nucleus
(d). Burning of coal
Answer: Option-A
7. Which of the following device not working based on principle of electromagnetic induction
(a). Dynamo
(b). Microphone
(c). Transformer
(d). Loud speaker
Answer: Option-D
8. Which electronic component not included in Integrated circuit
(a). Capacitor
(b). Inductor
(c). Resistor
(d). Transistor
Answer: Option-B
9. V/T is a constant. This is the mathematical expression of
(a). Charle's law
(b). Boyle's law
(c). Avogadro's law
(d). Gay Lussac's law
Answer: Option-A
10. What is the purpose of the spring in the galvanometer?
(A) To ensure a uniform force on the coil
(B) To complete the circuit through the coil
(C) To counteract the motor effect on the coil
(D) To increase the magnetic flux through the coil
Answer: Option- C
11. Pressure cookers are based on the principle that
a. The boiling point of liquid increases with increase in pressure
b. The boiling point of liquid decreases with increase in pressure
c. The boiling point of liquid remains constant
d. None of the above
Answer: A
12. A conducting polymer acting as an LED is being used in_____________ of mobile phones.
a. battery
b. speakers
c. mics
d. display
Answer: display
13. In the following rays which is not involved in Radio activity?
a. X-rays
b. a - rays
c. ß -yays
d. Gamma rays
Answer: X-rays
14. The time taken by the light to reach the earth from the sun is
a. 500 seconds
b. 5000 seconds
c. 3000 seconds
d. 300 seconds
Answer: 500 seconds
15. Which of the following has maximum value of surface tension?
(A) water
(B) alcohol
(C) ether
(D) mercury
Answer: Mercury
16. A wave is incident normally on a good conductor. If the frequency of a plane electromagnetic wave increases four times, the skin depth, will :
1) increase by a factor of 2
2) decrease by a factor of 4
3) remains the same
4) decrease by a factor of 2
Ans: decrease by a factor of 2
17. Poynting vector gives:
1) Rate of energy flow
2) direction of polarization
3) Intensity of electric field
4) Intensity of magnetic field
Ans: Rate of energy flow
18. Interference of light gives evidence that :
1) The speed of light is very large
2) Light is a transverse wave
3) Light is electromagnetic in character
4) Light is a wave phenomenon
Ans: Light is a wave phenomenon
19. How many slits would a diffraction grating need to be able to resolve two wavelengths: 500.0 nm and 500.1 nm in second order ?
1) 5000
2) 50,000
3) 25,000
4) 2500
Ans: 2500
20. When a light wave enters into a medium of different optical density :
1) its speed and frequency changes
2) its speed and wavelength changes
3) its frequency and wavelength changes
4) its speed, frequency and wavelength changes
Ans: 2- its speed and wavelength changes
21 Two light sources are said to be coherent if they :
1) are of the same frequency
2) are of the same frequency and maintain a constant phase difference
3) are of the same amplitude, and maintain a constant phase difference
4) are of the same frequency and amplitude
Ans: 2
22 The speed of electron in the first orbit of Hydrogen atom is , (c = velocity of light )
1) c
2) c/50
3) c/100
4) c/137
Ans: 4
23 AC (Alternating current) can be measured with the help of :
1) Moving coil galvanometer
2) Hot wire ammeter
3) Tangent galvanometer
4) Hot wire volmeter
Ans: 2
24 With increase in frequency of an AC supply, the impedence of an LCR series circuit :
1) Remains same
2) Increases
3) Decreases
4) Decreases at first, becomes minimum and then increases
Ans: 4
25 In an AC circuit , the electrical energy is consumed in :
1) L
2) C
3) R
4) L and C
Ans: 3
a. battery
b. speakers
c. mics
d. display
Answer: display
13. In the following rays which is not involved in Radio activity?
a. X-rays
b. a - rays
c. ß -yays
d. Gamma rays
Answer: X-rays
14. The time taken by the light to reach the earth from the sun is
a. 500 seconds
b. 5000 seconds
c. 3000 seconds
d. 300 seconds
Answer: 500 seconds
15. Which of the following has maximum value of surface tension?
(A) water
(B) alcohol
(C) ether
(D) mercury
Answer: Mercury
16. A wave is incident normally on a good conductor. If the frequency of a plane electromagnetic wave increases four times, the skin depth, will :
1) increase by a factor of 2
2) decrease by a factor of 4
3) remains the same
4) decrease by a factor of 2
Ans: decrease by a factor of 2
17. Poynting vector gives:
1) Rate of energy flow
2) direction of polarization
3) Intensity of electric field
4) Intensity of magnetic field
Ans: Rate of energy flow
18. Interference of light gives evidence that :
1) The speed of light is very large
2) Light is a transverse wave
3) Light is electromagnetic in character
4) Light is a wave phenomenon
Ans: Light is a wave phenomenon
19. How many slits would a diffraction grating need to be able to resolve two wavelengths: 500.0 nm and 500.1 nm in second order ?
1) 5000
2) 50,000
3) 25,000
4) 2500
Ans: 2500
20. When a light wave enters into a medium of different optical density :
1) its speed and frequency changes
2) its speed and wavelength changes
3) its frequency and wavelength changes
4) its speed, frequency and wavelength changes
Ans: 2- its speed and wavelength changes
21 Two light sources are said to be coherent if they :
1) are of the same frequency
2) are of the same frequency and maintain a constant phase difference
3) are of the same amplitude, and maintain a constant phase difference
4) are of the same frequency and amplitude
Ans: 2
22 The speed of electron in the first orbit of Hydrogen atom is , (c = velocity of light )
1) c
2) c/50
3) c/100
4) c/137
Ans: 4
23 AC (Alternating current) can be measured with the help of :
1) Moving coil galvanometer
2) Hot wire ammeter
3) Tangent galvanometer
4) Hot wire volmeter
Ans: 2
24 With increase in frequency of an AC supply, the impedence of an LCR series circuit :
1) Remains same
2) Increases
3) Decreases
4) Decreases at first, becomes minimum and then increases
Ans: 4
25 In an AC circuit , the electrical energy is consumed in :
1) L
2) C
3) R
4) L and C
Ans: 3
26. A particle of mass m is bound by a linear potential U=kr. For what energy will the orbit be a circle of radius r about the origin
A:-`(3kr)/(2)`
B:-3kr
C:-kr
D:-`(kr)/(2)`
Correct Answer:- Option-A
27. Two circular discs have the same mass m and same thickness t. Disc one has uniform density less than that of disc two. Which of the following is correct.
A:-Disc two has larger moment of inertia
B:-Disc one has larger moment of inertia
C:-Both have same moment of inertia
D:-Can not be predicted from given data.
Correct Answer:- Option-B
28. Consider motion of a particle of mass m under the influence of a force F=-kr, where k is a positive constant and r is the position vector of the particle. Now the orbit will be
A:-Ellipse
B:-Along a line
C:-Circle
D:-Parabola
Correct Answer:- Option-A
29. A violin string 0.5m long has a fundamental frequency 200Hz. At what speed does a transverse pulse travel on this string?
A:-100m/s
B:-400m/s
C:-200m/s
D:-300m/s
Correct Answer:- Option-C
30. Consider the longitudinal vibration of a linear triatomic molecule with two atoms of mass m each symmetrically situated on either sides of an atom of mass M. Now which of the following is a normal mode frequency of the system,if we use a spring model
A:-`sqrt(kM)`
B:-`sqrt(km)`
C:-0
D:-`sqrt(kMm)`
Correct Answer:- Option-C
31. Number of generalized coordinates required to describe the motion of a particle of mass m constrained to move on the surface of a sphere of radius R are
A:-3
B:-1
C:-0
D:-2
Correct Answer:- Option-D
32. The Hamiltonian of a particle in a central potential V(r) is
A:-`(p^(2))/(2m)`
B:-`(p^(2))/(2m)` +V(r)
C:-`(p^(2))/(2m)` -V(r)
D:-`(p^(2))/(2m)` +`gradV(r)`
Correct Answer:- Option-B
33. Two particles of same mass m are emitted in the same direction with momenta 5mc and 10mc respectively(c is the speed of light). As seen from the slower one, what is the speed of the faster particle?
A:-0.595c
B:-0.425c
C:-0.795c
D:-0.85c
Correct Answer:- Option-A
34. Which of the following has positive intrinsic curvature?
A:-Saddle
B:-Plane
C:-Sphere
D:-Cylinder
Correct Answer:- Option-C
35. A particle is constrained to move on a plane, where it is attracted towards a fixed point with force is inversely proportional to square of the distance from the point. What is the Lagrangian of the particle in polar coordinates?
A:-`(mdotr^(2)+mr^(2)dottheta^(2))/(2)` +`(k)/(r)`
B:-`(mdotr^(2))/(2)` +`(k)/(r)`
C:-`(mdotr^(2))/(2)` -`(k)/(r)`
D:-`(mdotr^(2))/(2)` +`(mr^(2)dottheta^(2))/(2)`
Correct Answer:- Option-A
36. The de-Broglie wavelength of an electron accelerated to a potential difference of V volts is
A:-`sqrt((150)/(V))` `dotA`````
B:-`(h)/(sqrt(2mE)` `dotA`
C:-`(h)/(sqrt(2mkT)` `dotA`
D:-`hsqrt((150)/(meV))``` `dotA`
Correct Answer:- Option-A
37. The electron orbit in a ground state hydrogen atom is in circumference equals to
A:-one de-Broglie wave length
B:-Two de-Broglie wave length
C:-Ten de-Broglie wave length
D:-Twelve and half de-Broglie wave length
Correct Answer:- Option-A
38. In case more than one linearly independent wave functions belong to the same energy E, the level is said to be
A:-orthogonal
B:-orthonormal
C:-degenerate
D:-non-degenerate
Correct Answer:- Option-C
39. The particle confined within the potential well displays
A:-discrete series of energy
B:-continuous series of energy
C:-both continuous and discrete series at time
D:-none of the above
Correct Answer:- Option-A
40. If the uncertainty in momentum Δ`p_(x)` is known, then Δ`p_(y)` will be
A:-equal to Δ`p_(x)`
B:-3.33x`10^(-10)` Δ`p_(x)`
C:-0.5x`10^(-10)` Δ`p_(x)`
D:-impossible to say
Correct Answer:- Option-D
41. A golf ball of 46 gm travels at 30 m/s. The wave length associated with it is
A:-4.8x`10^(-34)` m
B:-0.48x`10^(-34)` m
C:-4.8x`10^(-36)` m
D:-0.048x`10^(-34)` m
Correct Answer:- Option-A
42. Since electrons has an intrinsic magnetic dipole moment due to its spin, the electron interacts with the external magnetic field and the operator for this moment is `hatmu` is
A:-`(eh)/(4Pi m)` `hatsigma`
B:-`(eh)/(8Pi m)` `hatSigma`` `
C:-`(em)/(4(h/(2Pi))` `hatsigma`
D:-`(em)/(2(h/(2Pi))` `hatsigma`
Correct Answer:- Option-A
43. A wave function is said to be symmetric if the interchange of any pair of particles
A:-changes the sign of ψ
B:-does not change the sign of ψ
C:-change or does not change ψ
D:-none of the above is true
Correct Answer:- Option-B
44. The value of [`L_(x)` , `L_(y)` ] is
A:-i(h/2π) L
B:-i(h/2π)`L_(z)`
C:-zero
D:-i`L_(z)`
Correct Answer:- Option-B
45. Find the correct relation
A:-Hψ = i(h/2π) `(dPsi)/dx`
B:-HΨ = i(h/2π) `(dPsi)/dt`
C:-Hψ =(` `` ` `(h^2)/(8m)` `d^2/dx^2` +V )ψ
D:-Hψ =( `p^(2)` + `V^(2)` )ψ
Correct Answer:- Option-B
46. If a material has a conductivity of 25 S/m and relative permittivity of 80, then at a frequency of 3 GHz the material will acts as
A:-insulator
B:-conductor
C:-perfect dielectric
D:-none of the above
Correct Answer:- Option-B
47. For normal incidence at an air glass interface with refractive index of 1.5 the fraction of energy reflected is given by
A:-0.40
B:-0.2
C:-0.16
D:-0.04
Correct Answer:- Option-D
48. Which of the following current densities J can generate the magnetic vector potential A=y²i+x²j
A:-2(xi+ yj)/μ0
B:--2(i+ j)/μ0
C:--2(i-j)/μ0
D:-2(xi-yj)/μ0
Correct Answer:- Option-B
49. Find out the correct relation between magnetic field B and electric field E, if n is the unit vector along the direction of propagation
A:-B = (n×E)/c
B:-B = c(n×E)
C:-B = c/(n×E)
D:-B = (E×n)/c
Correct Answer:- Option-A
50. Neper/meter is the SI unit of
A:-phase constant
B:-attenuation constant
C:-planck’s constant
D:-skin depth
Correct Answer:- Option-B
51. A system of N non-interacting classical point particles are constrained to move on the two-dimensional surface of a sphere. The internal energy of the system is
A:-`(3)/(2)`N`k_(B)`T
B:-`(1)/(2)`N`k_(B)`T
C:-`(5)/(2)`N`k_(B)`T
D:-N`k_(B)`T
Correct Answer:- Option-D
52. The isothermal compressibility of an ideal gas at temperature T and volume V is given by
A:-K=-V`((delP)/(delV))_(T)`
B:-K=V`((delP)/(delV))_(T)`
C:-K=`(1)/(V)``((delV)/(delP))_(T)`
D:-K=-`(1)/(V)` `((delV)/(delP))_(T)`
Correct Answer:- Option-D
53. What is the temperature of an ideal gas of He atoms, if there are 6`xx` `10^(22)` atoms occupying 2 litres at atmospheric pressure?
A:-341K
B:-241K
C:-300K
D:-273K
Correct Answer:- Option-B
54. Consider a photon gas enclosed in a volume V and in equilibrium at temperature T. What is the chemical potential of this gas?
A:-`(3)/(2)` kT
B:-`(3)/(2)` `(kT)/(V)`
C:-0
D:-`(1)/(2)` kT
Correct Answer:- Option-C
55. A white dwarf star is supported against gravity by
A:-Electron degeneracy pressure
B:-Radiation pressure
C:-Thermal pressure
D:-Neutron degeneracy pressure
Correct Answer:- Option-A
56. Anomalous Zeeman effect is exhibited by atoms having
A:-zero spin angular momentum
B:-non-zero spin angular momentum
C:-non -zero orbital angular momentum
D:-none of these
Correct Answer:- Option-B
57. The lande g factor for the 3D1 level of an atom is
A:-1/2
B:-3/2
C:-5/2
D:-7/2
Correct Answer:- Option-A
58. The ratio of intensity of D1 and D2 line of sodium atom is
A:-1:2
B:-2:1
C:-3:2
D:-2:3
Correct Answer:- Option-B
59. Identify the molecule whose vibrations are both Raman and IR active
A:-`CO_(2)`
B:-`CS_(2)`
C:-`H_(2)O`
D:-`O_(2)`
Correct Answer:- Option-C
60. Metallic sodium has a BCC structure. Which of the following lines will be absent in the diffraction pattern
A:-(100)
B:-(200)
C:-(110)
D:-(222)
Correct Answer:- Option-A
61. The reciprocal lattice to a BCC lattice is a lattice of type
A:-Simple cubic
B:-BCC
C:-FCC
D:-none of the above
Correct Answer:- Option-C
62. Hall co-efficient gives an indication of
A:-thermal conductivity
B:-specific heat capacity
C:-carrier concentration
D:-None of the above
Correct Answer:- Option-C
63. If the fermi energy of copper is 7.0 eV, what is the corresponding fermi temperature ?
A:-81.2 K
B:-812 K
C:-8120 K
D:-81200 K
Correct Answer:- Option-D
64. Which of the following is not true for type I super conductor
A:-Exhibit complete Meissner Effect
B:-Perfect diamagnetism below Tc
C:-Also known as soft superconductors
D:-Exhibits a vortex state
Correct Answer:- Option-D
65. Average Binding Energy of a nucleon in the nucleus of an atom is
A:-7.8eV
B:-7.8KeV
C:-7.8MeV
D:-7.8BeV
Correct Answer:- Option-C
66. Weak nuclear forces act on
A:-both hadrons and leptons
B:-hadrons only
C:-all particles
D:-all charged particles
Correct Answer:- Option-A
67. An admissible potential between the proton and neutron in a deutron is
A:-coulomb
B:-harmonic oscillator
C:-finite square well
D:-infinite square well
Correct Answer:- Option-C
68. Half life of a radio active material is 4 days. After 20 days the fraction remaining undecayed will be
A:-1/32
B:-1/20
C:-1/16
D:-1/8
Correct Answer:- Option-A
69. Nuclear fusion requires high temperature because
A:-all nuclear reactions absorb heat
B:-the particles can not come closer unless they are moving rapidly
C:-the B.E. must be supplied from an external source
D:-mass defect must be supplied
Correct Answer:- Option-B
70. The ripple factor in a rectifier circuit indicates
A:-amount of a.c. voltage present in output
B:-amount of d.c. voltage present in output
C:-change in d.c. voltage when input a.c. changes
D:-change in d.c. voltage when load. changes
Correct Answer:- Option-A
71. The cathod of a zener diod in a voltage regulator is normally
A:-more positive than the anode
B:-more negative than the anode
C:-at +0.7 V
D:-grounded
Correct Answer:- Option-A
72. An oscillator differs from an amplifier because
A:-it has more gain
B:-it requres no input signals
C:-it requres no d.c. supply
D:-it always has the same output
Correct Answer:- Option-B
73. If maximum and minimum amplitudes of an amplitude modulated waves are 10V and 5V respectively, the modulation index is
A:-2
B:-0.5
C:-3.3
D:-0.33
Correct Answer:- Option-D
74. Thermal runaway is not possible in FET because as the temperature of FET increases
A:-the mobility decreases
B:-the transconductance increases
C:-the drain current increases
D:-none of the above
Correct Answer:- Option-A
75. The dimension of Cantor set is
A:-0
B:-0.631
C:-1.683
D:-1
Correct Answer:- Option-B
76. The fixed points of the Logistic map `x_(n+1)` = a`x_(n)` (1-`x_(n)`) are
A:-x=0 and x=1-`(1)/(a)`
B:-x=0 and x=1/a
C:-x=1 and x=1/a
D:-x=1 and x=1- `(1)/(a)`
Correct Answer:- Option-A
77. A stable and unstable fixed point collide each other and vanish as the control parameter is decreased in
A:-Hopf bifurcation
B:-Pitchfork bifurcation
C:-Transcritical bifurcation
D:-Saddle node bifurcation
Correct Answer:- Option-D
78. If l0> and l1> are eigen states of number operator which of these represent a state orthogonal to
`(1)/(sqrt(2))` (l0> + l1>)
A:-`(1)/(sqrt(2))` (l0> - l1>)
B:-`(1)/(sqrt(2))` (l0> + l1>)
C:-l1>
D:-l0>
Correct Answer:- Option-A
79. Among the following, the fullerene also known as "bucky ball" is
A:-`C_(70)`
B:-`C_(60)`
C:-`C_(76)`
D:-`C_(78)`
Correct Answer:- Option-B
80. Which among the following is a quantum dot?
A:-`CdSe`
B:-Ti`O_(2)`
C:-Sn`O_(2)`
D:-Y`Co_(2)`
Correct Answer:- Option-A
81. The temperature of cosmic background radiation is
A:-6K
B:-9.7K
C:-7.3K
D:-2.7K
Correct Answer:- Option-D
82. Name the person who won Nobel prize in physics in 2011 for predicting the accelerating expansion of universe?
A:-R Feynmann
B:-Eric Drexler
C:-Paul Steinhardt
D:-S Perlmutter
Correct Answer:- Option-D
83. The interaction which changes the flavor of a quark is?
A:-Strong interaction
B:-Electromagnetic interaction
C:-Weak interaction
D:-Gravitational interaction
Correct Answer:- Option-C
84:-The lighting methods in increasing order of power consumption are
A:-LED, Incandescent, CFL
B:-CFL, LED, Incandescent
C:-LED, CFL, Incandescent
D:-CFL, Incandescent, LED
Ans: C
85:-The rms value of a full wave rectified wave is ________ that of a sine wave with the same peak value.
A:-Same as
B:-Greater than
C:-Less than
D:-Greater or less than
Ans: A
86:-A battery with a 100 Ah rating can deliver
A:-10A for 1 hour
B:-5A for 20 hours
C:-10A for 20 hours
D:-1A for 10 hours
Ans: B
87:-Mobile data indicators in increasing order of speed are
A:-E, G, H, 3G
B:-H, G, E, 3G
C:-G, E, H, 3G
D:-G, E, 3G, H
Ans: D
88:-An 8 bit microcontroller has
A:-8-bit data bus
B:-8-bit address bus
C:-8-bit data and address buses
D:-8 interrupt lines
Ans: A
89:-The range of compression ratio that can be used in a spark ignition IC engine is ________.
A:-6:1 - 10:1
B:-16:1 - 20:1
C:-26:1 - 30:1
D:-36:1 - 40:1
Ans: A
90:-The size of fly wheel in a two stroke cycle engine when compared to that in a four stroke cycle engine having same capacity is _________.
A:-Same as that of four stroke cycle engine
B:-Heavier than that of four stroke cycle engine
C:-Lighter than that of four stroke cycle engine
D:-Can be of any size
Ans: C
91:-A gear box is provided in an automobile to vary the _________ on the road wheels.
A:-Speed
B:-Torque
C:-Horse power
D:-Efficiency
Ans: B
92:-If the head available in a proposed hydro-electric power project is 7-15 m of water, then the type of hydraulic turbine suitable for this project is __________.
A:-Pelton turbine
B:-Francis turbine
C:-Deriaz turbine
D:-Kaplan turbine
Ans: D
93:-The _________ is the thermodynamic vapour power cycle based on which a steam turbine in a steam power plant works.
A:-Joule cycle
B:-Brayton cycle
C:-Rankine cycle
D:-Otto cycle
Ans: C
A:-`(3kr)/(2)`
B:-3kr
C:-kr
D:-`(kr)/(2)`
Correct Answer:- Option-A
27. Two circular discs have the same mass m and same thickness t. Disc one has uniform density less than that of disc two. Which of the following is correct.
A:-Disc two has larger moment of inertia
B:-Disc one has larger moment of inertia
C:-Both have same moment of inertia
D:-Can not be predicted from given data.
Correct Answer:- Option-B
28. Consider motion of a particle of mass m under the influence of a force F=-kr, where k is a positive constant and r is the position vector of the particle. Now the orbit will be
A:-Ellipse
B:-Along a line
C:-Circle
D:-Parabola
Correct Answer:- Option-A
29. A violin string 0.5m long has a fundamental frequency 200Hz. At what speed does a transverse pulse travel on this string?
A:-100m/s
B:-400m/s
C:-200m/s
D:-300m/s
Correct Answer:- Option-C
30. Consider the longitudinal vibration of a linear triatomic molecule with two atoms of mass m each symmetrically situated on either sides of an atom of mass M. Now which of the following is a normal mode frequency of the system,if we use a spring model
A:-`sqrt(kM)`
B:-`sqrt(km)`
C:-0
D:-`sqrt(kMm)`
Correct Answer:- Option-C
31. Number of generalized coordinates required to describe the motion of a particle of mass m constrained to move on the surface of a sphere of radius R are
A:-3
B:-1
C:-0
D:-2
Correct Answer:- Option-D
32. The Hamiltonian of a particle in a central potential V(r) is
A:-`(p^(2))/(2m)`
B:-`(p^(2))/(2m)` +V(r)
C:-`(p^(2))/(2m)` -V(r)
D:-`(p^(2))/(2m)` +`gradV(r)`
Correct Answer:- Option-B
33. Two particles of same mass m are emitted in the same direction with momenta 5mc and 10mc respectively(c is the speed of light). As seen from the slower one, what is the speed of the faster particle?
A:-0.595c
B:-0.425c
C:-0.795c
D:-0.85c
Correct Answer:- Option-A
34. Which of the following has positive intrinsic curvature?
A:-Saddle
B:-Plane
C:-Sphere
D:-Cylinder
Correct Answer:- Option-C
35. A particle is constrained to move on a plane, where it is attracted towards a fixed point with force is inversely proportional to square of the distance from the point. What is the Lagrangian of the particle in polar coordinates?
A:-`(mdotr^(2)+mr^(2)dottheta^(2))/(2)` +`(k)/(r)`
B:-`(mdotr^(2))/(2)` +`(k)/(r)`
C:-`(mdotr^(2))/(2)` -`(k)/(r)`
D:-`(mdotr^(2))/(2)` +`(mr^(2)dottheta^(2))/(2)`
Correct Answer:- Option-A
36. The de-Broglie wavelength of an electron accelerated to a potential difference of V volts is
A:-`sqrt((150)/(V))` `dotA`````
B:-`(h)/(sqrt(2mE)` `dotA`
C:-`(h)/(sqrt(2mkT)` `dotA`
D:-`hsqrt((150)/(meV))``` `dotA`
Correct Answer:- Option-A
37. The electron orbit in a ground state hydrogen atom is in circumference equals to
A:-one de-Broglie wave length
B:-Two de-Broglie wave length
C:-Ten de-Broglie wave length
D:-Twelve and half de-Broglie wave length
Correct Answer:- Option-A
38. In case more than one linearly independent wave functions belong to the same energy E, the level is said to be
A:-orthogonal
B:-orthonormal
C:-degenerate
D:-non-degenerate
Correct Answer:- Option-C
39. The particle confined within the potential well displays
A:-discrete series of energy
B:-continuous series of energy
C:-both continuous and discrete series at time
D:-none of the above
Correct Answer:- Option-A
40. If the uncertainty in momentum Δ`p_(x)` is known, then Δ`p_(y)` will be
A:-equal to Δ`p_(x)`
B:-3.33x`10^(-10)` Δ`p_(x)`
C:-0.5x`10^(-10)` Δ`p_(x)`
D:-impossible to say
Correct Answer:- Option-D
41. A golf ball of 46 gm travels at 30 m/s. The wave length associated with it is
A:-4.8x`10^(-34)` m
B:-0.48x`10^(-34)` m
C:-4.8x`10^(-36)` m
D:-0.048x`10^(-34)` m
Correct Answer:- Option-A
42. Since electrons has an intrinsic magnetic dipole moment due to its spin, the electron interacts with the external magnetic field and the operator for this moment is `hatmu` is
A:-`(eh)/(4Pi m)` `hatsigma`
B:-`(eh)/(8Pi m)` `hatSigma`` `
C:-`(em)/(4(h/(2Pi))` `hatsigma`
D:-`(em)/(2(h/(2Pi))` `hatsigma`
Correct Answer:- Option-A
43. A wave function is said to be symmetric if the interchange of any pair of particles
A:-changes the sign of ψ
B:-does not change the sign of ψ
C:-change or does not change ψ
D:-none of the above is true
Correct Answer:- Option-B
44. The value of [`L_(x)` , `L_(y)` ] is
A:-i(h/2π) L
B:-i(h/2π)`L_(z)`
C:-zero
D:-i`L_(z)`
Correct Answer:- Option-B
45. Find the correct relation
A:-Hψ = i(h/2π) `(dPsi)/dx`
B:-HΨ = i(h/2π) `(dPsi)/dt`
C:-Hψ =(` `` ` `(h^2)/(8m)` `d^2/dx^2` +V )ψ
D:-Hψ =( `p^(2)` + `V^(2)` )ψ
Correct Answer:- Option-B
46. If a material has a conductivity of 25 S/m and relative permittivity of 80, then at a frequency of 3 GHz the material will acts as
A:-insulator
B:-conductor
C:-perfect dielectric
D:-none of the above
Correct Answer:- Option-B
47. For normal incidence at an air glass interface with refractive index of 1.5 the fraction of energy reflected is given by
A:-0.40
B:-0.2
C:-0.16
D:-0.04
Correct Answer:- Option-D
48. Which of the following current densities J can generate the magnetic vector potential A=y²i+x²j
A:-2(xi+ yj)/μ0
B:--2(i+ j)/μ0
C:--2(i-j)/μ0
D:-2(xi-yj)/μ0
Correct Answer:- Option-B
49. Find out the correct relation between magnetic field B and electric field E, if n is the unit vector along the direction of propagation
A:-B = (n×E)/c
B:-B = c(n×E)
C:-B = c/(n×E)
D:-B = (E×n)/c
Correct Answer:- Option-A
50. Neper/meter is the SI unit of
A:-phase constant
B:-attenuation constant
C:-planck’s constant
D:-skin depth
Correct Answer:- Option-B
51. A system of N non-interacting classical point particles are constrained to move on the two-dimensional surface of a sphere. The internal energy of the system is
A:-`(3)/(2)`N`k_(B)`T
B:-`(1)/(2)`N`k_(B)`T
C:-`(5)/(2)`N`k_(B)`T
D:-N`k_(B)`T
Correct Answer:- Option-D
52. The isothermal compressibility of an ideal gas at temperature T and volume V is given by
A:-K=-V`((delP)/(delV))_(T)`
B:-K=V`((delP)/(delV))_(T)`
C:-K=`(1)/(V)``((delV)/(delP))_(T)`
D:-K=-`(1)/(V)` `((delV)/(delP))_(T)`
Correct Answer:- Option-D
53. What is the temperature of an ideal gas of He atoms, if there are 6`xx` `10^(22)` atoms occupying 2 litres at atmospheric pressure?
A:-341K
B:-241K
C:-300K
D:-273K
Correct Answer:- Option-B
54. Consider a photon gas enclosed in a volume V and in equilibrium at temperature T. What is the chemical potential of this gas?
A:-`(3)/(2)` kT
B:-`(3)/(2)` `(kT)/(V)`
C:-0
D:-`(1)/(2)` kT
Correct Answer:- Option-C
55. A white dwarf star is supported against gravity by
A:-Electron degeneracy pressure
B:-Radiation pressure
C:-Thermal pressure
D:-Neutron degeneracy pressure
Correct Answer:- Option-A
56. Anomalous Zeeman effect is exhibited by atoms having
A:-zero spin angular momentum
B:-non-zero spin angular momentum
C:-non -zero orbital angular momentum
D:-none of these
Correct Answer:- Option-B
57. The lande g factor for the 3D1 level of an atom is
A:-1/2
B:-3/2
C:-5/2
D:-7/2
Correct Answer:- Option-A
58. The ratio of intensity of D1 and D2 line of sodium atom is
A:-1:2
B:-2:1
C:-3:2
D:-2:3
Correct Answer:- Option-B
59. Identify the molecule whose vibrations are both Raman and IR active
A:-`CO_(2)`
B:-`CS_(2)`
C:-`H_(2)O`
D:-`O_(2)`
Correct Answer:- Option-C
60. Metallic sodium has a BCC structure. Which of the following lines will be absent in the diffraction pattern
A:-(100)
B:-(200)
C:-(110)
D:-(222)
Correct Answer:- Option-A
61. The reciprocal lattice to a BCC lattice is a lattice of type
A:-Simple cubic
B:-BCC
C:-FCC
D:-none of the above
Correct Answer:- Option-C
62. Hall co-efficient gives an indication of
A:-thermal conductivity
B:-specific heat capacity
C:-carrier concentration
D:-None of the above
Correct Answer:- Option-C
63. If the fermi energy of copper is 7.0 eV, what is the corresponding fermi temperature ?
A:-81.2 K
B:-812 K
C:-8120 K
D:-81200 K
Correct Answer:- Option-D
64. Which of the following is not true for type I super conductor
A:-Exhibit complete Meissner Effect
B:-Perfect diamagnetism below Tc
C:-Also known as soft superconductors
D:-Exhibits a vortex state
Correct Answer:- Option-D
65. Average Binding Energy of a nucleon in the nucleus of an atom is
A:-7.8eV
B:-7.8KeV
C:-7.8MeV
D:-7.8BeV
Correct Answer:- Option-C
66. Weak nuclear forces act on
A:-both hadrons and leptons
B:-hadrons only
C:-all particles
D:-all charged particles
Correct Answer:- Option-A
67. An admissible potential between the proton and neutron in a deutron is
A:-coulomb
B:-harmonic oscillator
C:-finite square well
D:-infinite square well
Correct Answer:- Option-C
68. Half life of a radio active material is 4 days. After 20 days the fraction remaining undecayed will be
A:-1/32
B:-1/20
C:-1/16
D:-1/8
Correct Answer:- Option-A
69. Nuclear fusion requires high temperature because
A:-all nuclear reactions absorb heat
B:-the particles can not come closer unless they are moving rapidly
C:-the B.E. must be supplied from an external source
D:-mass defect must be supplied
Correct Answer:- Option-B
70. The ripple factor in a rectifier circuit indicates
A:-amount of a.c. voltage present in output
B:-amount of d.c. voltage present in output
C:-change in d.c. voltage when input a.c. changes
D:-change in d.c. voltage when load. changes
Correct Answer:- Option-A
71. The cathod of a zener diod in a voltage regulator is normally
A:-more positive than the anode
B:-more negative than the anode
C:-at +0.7 V
D:-grounded
Correct Answer:- Option-A
72. An oscillator differs from an amplifier because
A:-it has more gain
B:-it requres no input signals
C:-it requres no d.c. supply
D:-it always has the same output
Correct Answer:- Option-B
73. If maximum and minimum amplitudes of an amplitude modulated waves are 10V and 5V respectively, the modulation index is
A:-2
B:-0.5
C:-3.3
D:-0.33
Correct Answer:- Option-D
74. Thermal runaway is not possible in FET because as the temperature of FET increases
A:-the mobility decreases
B:-the transconductance increases
C:-the drain current increases
D:-none of the above
Correct Answer:- Option-A
75. The dimension of Cantor set is
A:-0
B:-0.631
C:-1.683
D:-1
Correct Answer:- Option-B
76. The fixed points of the Logistic map `x_(n+1)` = a`x_(n)` (1-`x_(n)`) are
A:-x=0 and x=1-`(1)/(a)`
B:-x=0 and x=1/a
C:-x=1 and x=1/a
D:-x=1 and x=1- `(1)/(a)`
Correct Answer:- Option-A
77. A stable and unstable fixed point collide each other and vanish as the control parameter is decreased in
A:-Hopf bifurcation
B:-Pitchfork bifurcation
C:-Transcritical bifurcation
D:-Saddle node bifurcation
Correct Answer:- Option-D
78. If l0> and l1> are eigen states of number operator which of these represent a state orthogonal to
`(1)/(sqrt(2))` (l0> + l1>)
A:-`(1)/(sqrt(2))` (l0> - l1>)
B:-`(1)/(sqrt(2))` (l0> + l1>)
C:-l1>
D:-l0>
Correct Answer:- Option-A
79. Among the following, the fullerene also known as "bucky ball" is
A:-`C_(70)`
B:-`C_(60)`
C:-`C_(76)`
D:-`C_(78)`
Correct Answer:- Option-B
80. Which among the following is a quantum dot?
A:-`CdSe`
B:-Ti`O_(2)`
C:-Sn`O_(2)`
D:-Y`Co_(2)`
Correct Answer:- Option-A
81. The temperature of cosmic background radiation is
A:-6K
B:-9.7K
C:-7.3K
D:-2.7K
Correct Answer:- Option-D
82. Name the person who won Nobel prize in physics in 2011 for predicting the accelerating expansion of universe?
A:-R Feynmann
B:-Eric Drexler
C:-Paul Steinhardt
D:-S Perlmutter
Correct Answer:- Option-D
83. The interaction which changes the flavor of a quark is?
A:-Strong interaction
B:-Electromagnetic interaction
C:-Weak interaction
D:-Gravitational interaction
Correct Answer:- Option-C
84:-The lighting methods in increasing order of power consumption are
A:-LED, Incandescent, CFL
B:-CFL, LED, Incandescent
C:-LED, CFL, Incandescent
D:-CFL, Incandescent, LED
Ans: C
85:-The rms value of a full wave rectified wave is ________ that of a sine wave with the same peak value.
A:-Same as
B:-Greater than
C:-Less than
D:-Greater or less than
Ans: A
86:-A battery with a 100 Ah rating can deliver
A:-10A for 1 hour
B:-5A for 20 hours
C:-10A for 20 hours
D:-1A for 10 hours
Ans: B
87:-Mobile data indicators in increasing order of speed are
A:-E, G, H, 3G
B:-H, G, E, 3G
C:-G, E, H, 3G
D:-G, E, 3G, H
Ans: D
88:-An 8 bit microcontroller has
A:-8-bit data bus
B:-8-bit address bus
C:-8-bit data and address buses
D:-8 interrupt lines
Ans: A
89:-The range of compression ratio that can be used in a spark ignition IC engine is ________.
A:-6:1 - 10:1
B:-16:1 - 20:1
C:-26:1 - 30:1
D:-36:1 - 40:1
Ans: A
90:-The size of fly wheel in a two stroke cycle engine when compared to that in a four stroke cycle engine having same capacity is _________.
A:-Same as that of four stroke cycle engine
B:-Heavier than that of four stroke cycle engine
C:-Lighter than that of four stroke cycle engine
D:-Can be of any size
Ans: C
91:-A gear box is provided in an automobile to vary the _________ on the road wheels.
A:-Speed
B:-Torque
C:-Horse power
D:-Efficiency
Ans: B
92:-If the head available in a proposed hydro-electric power project is 7-15 m of water, then the type of hydraulic turbine suitable for this project is __________.
A:-Pelton turbine
B:-Francis turbine
C:-Deriaz turbine
D:-Kaplan turbine
Ans: D
93:-The _________ is the thermodynamic vapour power cycle based on which a steam turbine in a steam power plant works.
A:-Joule cycle
B:-Brayton cycle
C:-Rankine cycle
D:-Otto cycle
Ans: C
94:-The minimum depth for all foundations below the natural ground level is
A:-500 mm
B:-1200 mm
C:-250 mm
D:-100 mm
Ans: A
95:-A projected stone in masonry wall provided to joist or truss is known as
A:-cornice
B:-corbel
C:-coping
D:-cramp
Ans: B
96:-The sag correction for chain line will be when `W` is the weight of the chain, `L` is the span and `P` is the tension or pull
A:-`W^2L^2` / `24P^2`
B:-`W^2L` / `24P`
C:-`W^2L` /`24P^2`
D:-`W^2L^2` /`24P`
Ans: C
97:-Natural error in levelling is caused due to
A:-Wind vibration
B:-Atmospheric refraction
C:-Temperature variation
D:-All the above
Ans: D
98:-Find the time taken for a sinusoidal alternating current of maximum value 20A to reach 15A for the first time, after being instantaneously zero, the supply frequency being 40 Hz
A:-2.35 ms
B:-3.37 ms
C:-4.44 ms
D:-1.23 ms
Ans: B
99:-The voltage across a 20 μF capacitor is given by `V_c=10.75-1.5e^{-1000t}+0.75e^{-2000t}` . What is the current through the capacitance.
A:-`0.03(e^{-1000 t}-e^{-2000 t})`
B:-`0.3(e^{-1000t}-e^{-2000t})`
C:-`3(e^{-1000t}-e^{-2000t})`
D:-`0.003(e^{-1000t}-e^{-2000t})`
Ans: A
100:-Two coils having equal resistance but different inductances are connected in series. The time constant of the series combination is
A:-Sum of the time constant of individual coils
B:-Average of the time constant of individual coils
C:-Geometrical mean of the time constant of individual coils
D:-Product of the time constant of individual coils
Ans: B
A:-500 mm
B:-1200 mm
C:-250 mm
D:-100 mm
Ans: A
95:-A projected stone in masonry wall provided to joist or truss is known as
A:-cornice
B:-corbel
C:-coping
D:-cramp
Ans: B
96:-The sag correction for chain line will be when `W` is the weight of the chain, `L` is the span and `P` is the tension or pull
A:-`W^2L^2` / `24P^2`
B:-`W^2L` / `24P`
C:-`W^2L` /`24P^2`
D:-`W^2L^2` /`24P`
Ans: C
97:-Natural error in levelling is caused due to
A:-Wind vibration
B:-Atmospheric refraction
C:-Temperature variation
D:-All the above
Ans: D
98:-Find the time taken for a sinusoidal alternating current of maximum value 20A to reach 15A for the first time, after being instantaneously zero, the supply frequency being 40 Hz
A:-2.35 ms
B:-3.37 ms
C:-4.44 ms
D:-1.23 ms
Ans: B
99:-The voltage across a 20 μF capacitor is given by `V_c=10.75-1.5e^{-1000t}+0.75e^{-2000t}` . What is the current through the capacitance.
A:-`0.03(e^{-1000 t}-e^{-2000 t})`
B:-`0.3(e^{-1000t}-e^{-2000t})`
C:-`3(e^{-1000t}-e^{-2000t})`
D:-`0.003(e^{-1000t}-e^{-2000t})`
Ans: A
100:-Two coils having equal resistance but different inductances are connected in series. The time constant of the series combination is
A:-Sum of the time constant of individual coils
B:-Average of the time constant of individual coils
C:-Geometrical mean of the time constant of individual coils
D:-Product of the time constant of individual coils
Ans: B