PHYSICS- PAGE 10
1. The inverse of wavelength is referred as
(a) wave number
(b) wavelength itself
(c) frequency
(d) momentum
Ans: A
2. Which of the following scientific instrument has the greatest resolving power ?
(a) Electron microscope
(b) Light microscope
(c) Telescope
(d) Phase-contrast microscope
Ans: A
3. The de-Broglie wavelength of an electron having 80 eV energy is
(a) 140 ÅU
(b) 0.14 ÅU
(c) 1.4 ÅU
(d) 14 ÅU
Ans: C
4. The probability of finding one dimensional quantum simple harmonic oscillator within the classical limits, when the oscillator is in ground state is –
(a) 50% (b) 67% (c) 84% (d) 100%
Ans: C
5. The ratio of minimum wavelength of Lyman and Balmer series will be
(a) 1.25 (b) 0.25 (c) 5 (d) 10
Ans: B
6. In which region of electromagnetic spectrum does the Lyman series of hydrogen atom lies ?
(a) X-ray (b) Infrared (c) Visible (d) Ultraviolet
Ans: D
7. The Milikan experiment showed that the electric charge was
(a) negative (b) positive (c) quantized (d) unmeasurable
Ans: C
8. An X-ray photon collides with a free electron and the photon is scattered. During this collision there is conservation of
(a) momentum but not energy (b) neither momentum nor energy
(c) energy but not momentum (d) both momentum and energy
Ans: D
9. The half life of an isotope of an element is 5 days. The mass of a 10 gm sample of this isotope remaining after 20 days is
(a) 0.312 gms (b) 0.625 gms (c) 1.25 gms (d) 2.50 gms
Ans: B
10. Alpha particle are nuclei of
(a) hydrogen (b) helium (c) oxygen (d) nitrogen
Ans: B
11. The intrinsic semi-conductor has
(a) a finite resistance which does not change with temperature.
(b) infinite resistance which decreases with temperature.
(c) finite resistance which decreases with temperature.
(d) infinite resistance which does not change with temperature.
Ans: C
12. Reverse bias applied on a junction diode
(a) raises the potential barrier (b) increases majority charge carrier current
(c) lowers the potential barrier (d) increases the temperature of junction
Ans: A
13. Which of the following is universal gate ?
(a) NOT (b) AND (c) NAND (d) OR
Ans: C
14. Light emitting diode
(a) is always forward biased. (b) is always reverse biased.
(c) may be forward or reverse biased. (d) requires no biasing.
Ans: A
15. In n–p–n transistor
(a) holes move from emitter to base (b) electrons move from emitter to base
(c) holes move from base to collector (d) electrons move from collector to base
Ans: B
16. Which of the following is not a component of communication system ?
(a) Transistor (b) Transmission channel (c) Noise (d) Receiver
Ans: C
17. Refractive index of ionosphere is
(a) one (b) more than one (c) less than one (d) zero
Ans: C
18. What is the working principle of an optical fibre ?
(a) Refraction (b) Total internal reflection (c) Dispersion (d) Scattering
Ans: B
19. Atomic spectra is an example of
(a) Line spectra (b) Continuous spectra (c) Band spectra (d) Both (a) and (b)
Ans: A
20. The fine structure constant has a value near about
(a) 1/11 (b) 1/111 (c) 1/137 (d) 1/127
Ans: C
21. Allowed transitions obey the
(a) Hund’s rule (b) Selection rule ∆l = ± 1
(c) Spin resonance rule, ∆l = + 1 (d) None of these
Ans: B
22. The decimal number for octal 74 is
(a) 22 (b) 32 (c) 60 (d) 74
Ans: C
23. When a metal becomes a super-conductor, there is tremendous decrease in
(a) total volume (b) electrical resistance (c) length (d) density
Ans: B
24. In the Sun, the helium is produced from hydrogen by
(a) radioactive decay (b) disintegration (c) fission (d) fusion
Ans: D
25. One of the following is a device that detects charged particles but does not show their tracks. Which is that device ?
(a) Spark chamber (b) Photographic plate (c) Scintillation counter (d) Bubble chamber
Ans: C
26. The neutron in an atom
(a) are part of nuclear charge.
(b) rotate about the nucleus in circular orbits.
(c) vary in number with different isotopes.
(d) are always equal in number to the total number of protons.
Ans: C
27. When an atom undergoes beta decay, the atomic number of nucleus
(a) is increased. (b) increases by one.
(c) decreases by one. (d) None of these
Ans: B
28. Rest mass energy of an electron is
(a) 1.02 MeV (b) 0.511 MeV (c) 0.511 KeV (d) 0.511 GeV
Ans: B
29. A superconducting material when placed in a magnetic field will
(a) attract the magnetic field towards its centre.
(b) repel all the magnetic lines of forces passing through it.
(c) attract the magnetic field but transfer it into concentrated zone.
(d) not influenced by the magnetic field.
Ans: B
30. X-rays are used to detect the internal structure of crystal because
(a) X-rays are not harmful.
(b) Wavelength of X-rays matches with inter-planner distance of crystal.
(c) Bragg condition is satisfied with X-rays only.
(d) None of these
Ans: B
31. An anti-proton is an atomic particle that has
(a) the mass of proton and charge of an electron.
(b) the mass of an electron and charge of a proton.
(c) the mass of a neutron and charge of a proton.
(d) the mass of a proton and charge of a neutron.
Ans: A
32. Which of the following conservation laws have broken symmetry ?
(a) Lepton number (b) Baryon number (c) Charge number (d) Strangeners
Ans: D
33. The charge of a particle which is made up of three quarks dds is
(a) +e (b) +2/3 e (c) –e (d) +1/3 e
Ans: C
34. Stokes’ theorem relates
(a) Surface integral of curl of a vector field with the divergence of that field.
(b) Surface integral of curl of a vector field with the line integral of that field.
(c) Line integral of curl of a vector field to divergence of a vector field.
(d) Divergence of a vector field to the curl of that field.
Ans: B
35. The Eigen values of Hermitian matrix are always
(a) positive (b) negative (c) real (d) complex
Ans: C
36. Diadic tensor has rank
(a) 0 (b) 1 (c) 2 (d) 3
Ans: C
37. The first law of thermodynamics is a statement of
(a) Conservation of heat (b) Conservation of angular momentum
(c) Conservation of linear momentum (d) Conservation of energy
Ans: D
38. Root mean square (r.m.s.) velocity of a gas molecules of mass ‘m’ at given temperature is proportional to
(a) m2 (b) m (c) √m (d) 1/ √m
Ans: D
39. The specific heat of a gas in isothermal process is
(a) zero (b) negative (c) remain constant (d) infinite
Ans: D
40. Which of the following are not made up of quarks ?
(a) Mesons (b) Baryons (c) Laptons (d) Hadrons
Ans: C
41. Interference occurs due to _______ of light.
(a) Particle nature (b) Both particle and wave nature (c) Wave nature (d) None of these
Ans: C
42:-In full wave rectification, if the input frequency is 50 Hz, then the output frequency will be
A:-50 Hz B:-75 Hz C:-100 Hz D:-200 Hz
Ans: C
43:-A fully charged 12 V, 100 Ah battery is connected to a 1.2 Ω load. The expected time for which the battery can supply power to load is
A:-10 hours B:-12 hours C:-1.2 hours D:-144 hours
Ans: A
44:-A microcontroller normally has which of the following devices on chip?
A:-RAM B:-ROM C:-I/O ports D:-All of the above
Ans: D
45. Lorentz force law is :
(A) F = q(VxB + E)
(B) F = qE + VxB
(C) F = q(VxB) + E
(D) F = q(VxE + B)
Ans: A
46. Current per unit area in a direction perpendicular to the flow is :
(A) Surface current density (B) Volume current density (C) Electric current (D) Surface charge density
Ans: B
47. Two coherent monochromatic light beams of intensities I and 4I are superimposed. The maximum and minimum intensities in the resulting beam are :
(A) 5I and I (B) 5I and 3I (C) 9Iand I (D) 9I and 3I
Ans: C
48. Orbital motion of electrons accounts for the phenomenon of :
(A) Paramagnetism (B) Ferromagnetism (C) Diamagnetism (D) All of the above
Ans: C
49. A rigid container with thermally insulated walls contains a coil of resistance 100 ohm carrying current 1 ampere. Change in internal energy after 5 minutes will be :
(A) Zero (B) 10 kilojoule (C) 20 kilojoule (D) 30 kilojoule
Ans: D
50. A hollow metal sphere of radius 5 cm is charged such that the potential on its surface is 10 V. The potential at the centre is :
(A) 2 V (B) 10 V
(C) Zero (D) None of the above
Ans: B
(a) wave number
(b) wavelength itself
(c) frequency
(d) momentum
Ans: A
2. Which of the following scientific instrument has the greatest resolving power ?
(a) Electron microscope
(b) Light microscope
(c) Telescope
(d) Phase-contrast microscope
Ans: A
3. The de-Broglie wavelength of an electron having 80 eV energy is
(a) 140 ÅU
(b) 0.14 ÅU
(c) 1.4 ÅU
(d) 14 ÅU
Ans: C
4. The probability of finding one dimensional quantum simple harmonic oscillator within the classical limits, when the oscillator is in ground state is –
(a) 50% (b) 67% (c) 84% (d) 100%
Ans: C
5. The ratio of minimum wavelength of Lyman and Balmer series will be
(a) 1.25 (b) 0.25 (c) 5 (d) 10
Ans: B
6. In which region of electromagnetic spectrum does the Lyman series of hydrogen atom lies ?
(a) X-ray (b) Infrared (c) Visible (d) Ultraviolet
Ans: D
7. The Milikan experiment showed that the electric charge was
(a) negative (b) positive (c) quantized (d) unmeasurable
Ans: C
8. An X-ray photon collides with a free electron and the photon is scattered. During this collision there is conservation of
(a) momentum but not energy (b) neither momentum nor energy
(c) energy but not momentum (d) both momentum and energy
Ans: D
9. The half life of an isotope of an element is 5 days. The mass of a 10 gm sample of this isotope remaining after 20 days is
(a) 0.312 gms (b) 0.625 gms (c) 1.25 gms (d) 2.50 gms
Ans: B
10. Alpha particle are nuclei of
(a) hydrogen (b) helium (c) oxygen (d) nitrogen
Ans: B
11. The intrinsic semi-conductor has
(a) a finite resistance which does not change with temperature.
(b) infinite resistance which decreases with temperature.
(c) finite resistance which decreases with temperature.
(d) infinite resistance which does not change with temperature.
Ans: C
12. Reverse bias applied on a junction diode
(a) raises the potential barrier (b) increases majority charge carrier current
(c) lowers the potential barrier (d) increases the temperature of junction
Ans: A
13. Which of the following is universal gate ?
(a) NOT (b) AND (c) NAND (d) OR
Ans: C
14. Light emitting diode
(a) is always forward biased. (b) is always reverse biased.
(c) may be forward or reverse biased. (d) requires no biasing.
Ans: A
15. In n–p–n transistor
(a) holes move from emitter to base (b) electrons move from emitter to base
(c) holes move from base to collector (d) electrons move from collector to base
Ans: B
16. Which of the following is not a component of communication system ?
(a) Transistor (b) Transmission channel (c) Noise (d) Receiver
Ans: C
17. Refractive index of ionosphere is
(a) one (b) more than one (c) less than one (d) zero
Ans: C
18. What is the working principle of an optical fibre ?
(a) Refraction (b) Total internal reflection (c) Dispersion (d) Scattering
Ans: B
19. Atomic spectra is an example of
(a) Line spectra (b) Continuous spectra (c) Band spectra (d) Both (a) and (b)
Ans: A
20. The fine structure constant has a value near about
(a) 1/11 (b) 1/111 (c) 1/137 (d) 1/127
Ans: C
21. Allowed transitions obey the
(a) Hund’s rule (b) Selection rule ∆l = ± 1
(c) Spin resonance rule, ∆l = + 1 (d) None of these
Ans: B
22. The decimal number for octal 74 is
(a) 22 (b) 32 (c) 60 (d) 74
Ans: C
23. When a metal becomes a super-conductor, there is tremendous decrease in
(a) total volume (b) electrical resistance (c) length (d) density
Ans: B
24. In the Sun, the helium is produced from hydrogen by
(a) radioactive decay (b) disintegration (c) fission (d) fusion
Ans: D
25. One of the following is a device that detects charged particles but does not show their tracks. Which is that device ?
(a) Spark chamber (b) Photographic plate (c) Scintillation counter (d) Bubble chamber
Ans: C
26. The neutron in an atom
(a) are part of nuclear charge.
(b) rotate about the nucleus in circular orbits.
(c) vary in number with different isotopes.
(d) are always equal in number to the total number of protons.
Ans: C
27. When an atom undergoes beta decay, the atomic number of nucleus
(a) is increased. (b) increases by one.
(c) decreases by one. (d) None of these
Ans: B
28. Rest mass energy of an electron is
(a) 1.02 MeV (b) 0.511 MeV (c) 0.511 KeV (d) 0.511 GeV
Ans: B
29. A superconducting material when placed in a magnetic field will
(a) attract the magnetic field towards its centre.
(b) repel all the magnetic lines of forces passing through it.
(c) attract the magnetic field but transfer it into concentrated zone.
(d) not influenced by the magnetic field.
Ans: B
30. X-rays are used to detect the internal structure of crystal because
(a) X-rays are not harmful.
(b) Wavelength of X-rays matches with inter-planner distance of crystal.
(c) Bragg condition is satisfied with X-rays only.
(d) None of these
Ans: B
31. An anti-proton is an atomic particle that has
(a) the mass of proton and charge of an electron.
(b) the mass of an electron and charge of a proton.
(c) the mass of a neutron and charge of a proton.
(d) the mass of a proton and charge of a neutron.
Ans: A
32. Which of the following conservation laws have broken symmetry ?
(a) Lepton number (b) Baryon number (c) Charge number (d) Strangeners
Ans: D
33. The charge of a particle which is made up of three quarks dds is
(a) +e (b) +2/3 e (c) –e (d) +1/3 e
Ans: C
34. Stokes’ theorem relates
(a) Surface integral of curl of a vector field with the divergence of that field.
(b) Surface integral of curl of a vector field with the line integral of that field.
(c) Line integral of curl of a vector field to divergence of a vector field.
(d) Divergence of a vector field to the curl of that field.
Ans: B
35. The Eigen values of Hermitian matrix are always
(a) positive (b) negative (c) real (d) complex
Ans: C
36. Diadic tensor has rank
(a) 0 (b) 1 (c) 2 (d) 3
Ans: C
37. The first law of thermodynamics is a statement of
(a) Conservation of heat (b) Conservation of angular momentum
(c) Conservation of linear momentum (d) Conservation of energy
Ans: D
38. Root mean square (r.m.s.) velocity of a gas molecules of mass ‘m’ at given temperature is proportional to
(a) m2 (b) m (c) √m (d) 1/ √m
Ans: D
39. The specific heat of a gas in isothermal process is
(a) zero (b) negative (c) remain constant (d) infinite
Ans: D
40. Which of the following are not made up of quarks ?
(a) Mesons (b) Baryons (c) Laptons (d) Hadrons
Ans: C
41. Interference occurs due to _______ of light.
(a) Particle nature (b) Both particle and wave nature (c) Wave nature (d) None of these
Ans: C
42:-In full wave rectification, if the input frequency is 50 Hz, then the output frequency will be
A:-50 Hz B:-75 Hz C:-100 Hz D:-200 Hz
Ans: C
43:-A fully charged 12 V, 100 Ah battery is connected to a 1.2 Ω load. The expected time for which the battery can supply power to load is
A:-10 hours B:-12 hours C:-1.2 hours D:-144 hours
Ans: A
44:-A microcontroller normally has which of the following devices on chip?
A:-RAM B:-ROM C:-I/O ports D:-All of the above
Ans: D
45. Lorentz force law is :
(A) F = q(VxB + E)
(B) F = qE + VxB
(C) F = q(VxB) + E
(D) F = q(VxE + B)
Ans: A
46. Current per unit area in a direction perpendicular to the flow is :
(A) Surface current density (B) Volume current density (C) Electric current (D) Surface charge density
Ans: B
47. Two coherent monochromatic light beams of intensities I and 4I are superimposed. The maximum and minimum intensities in the resulting beam are :
(A) 5I and I (B) 5I and 3I (C) 9Iand I (D) 9I and 3I
Ans: C
48. Orbital motion of electrons accounts for the phenomenon of :
(A) Paramagnetism (B) Ferromagnetism (C) Diamagnetism (D) All of the above
Ans: C
49. A rigid container with thermally insulated walls contains a coil of resistance 100 ohm carrying current 1 ampere. Change in internal energy after 5 minutes will be :
(A) Zero (B) 10 kilojoule (C) 20 kilojoule (D) 30 kilojoule
Ans: D
50. A hollow metal sphere of radius 5 cm is charged such that the potential on its surface is 10 V. The potential at the centre is :
(A) 2 V (B) 10 V
(C) Zero (D) None of the above
Ans: B
51. A magnetic needle is kept in a non-uniform magnetic field. It experiences :
(A) A force and a torque (B) A force but not a torque
(C) A torque but not a force (D) Neither a force nor a torque
Ans: A
52. An inductor L is allowed to discharge through a capacitor C. The emf induced across the inductor, when the capacitor is fully charged is :
(A) Maximum (B) Minimum
(C) Infinite (D) Zero
Ans: A
53. A capacitor start and capacitor run motors are examples of
54. The electric motors runs on a principle of
55. In a kerosene lamp the oil rise up along the wick due to capillary action. This capillary rise occurs when :
(A) The adhesive force is greater than cohesive force (B) The adhesive force is less than cohesive force
(C) The adhesive force is equal to cohesive force (D) All of the above
Ans: A
56. When small to moderate earthquakes occur certain sound waves are produced. Even though certain animals respond to it, we can’t hear this. This is because, in this case :
(A) Sound waves of greater than 20000 Hz are produced (B) Sound waves of 20 Hz to 20000 Hz are produced
(C) Sound waves of less than 20 Hz are produced (D) None of the above
Ans: C
57. Viscosity is a property of
58. In P- type semi-conductor the majority carrier is:
59. ________ is an example of electromagnetic radiation and has the shortest wave length
60. A leaf which contains only a green pigment is illuminated with monochromatic red light. The leaf will appear to be
61. The frequency of ultrasound wave is typically
(A) Above 20,000 kHz (B) Below 20 kHz (C) Above 20 kHz (D) Below 2 kHz
Ans: C
62. If three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two. This statement is called :
(A) Converse of the Law of Triangle of forces
(B) Lamie’s Theorem
(C) Law of Triangle of forces
(D) None of these
Ans: B
63. When a body is about to slide down, the inclination of the plane to the horizontal is :
(A) Equal to the angle of friction (B) More than the angle of friction
(C) Less than the angle of friction (D) None of these
Ans: A
64. The ratio of shear stress to shear strain is called :
(A) Young’s modulus (B) Bulk Modulus
(C) Modulus of rigidity (D) Modulus of elasticity
Ans: C
65. In the case of stress strain curve for mild steel bar when conducted a tensile test, strain goes on increasing without an appreciable load, the stress corresponding to this is :
(A) Ultimate stress (B) Fracture stress
(C) Nominal stress (D) Yield stress
Ans: D
66. The maximum strain energy stored per unit volume at elastic limit is :
(A) Stiffness (B) Modulus of resilience (C) Resilience (D) Proof resilience
Ans: D
67. For a solid rectangular column the slenderness ratio is :
(A) Height of column/Maximum width of the column
(B) Length of the column/Height of the column
(C) Height of column/Least side of column
(D) None of these
Ans: C
68. Under torsion, every section of the shaft is subjected to :
(A) Tensile stress (B) Shear stress
(C) Compressive stress (D) Normal stress
Ans: B
69. The internal resistance of a body to external forces/loads that the body is subjected to is called:
(A) Load (B) Pressure
(C) Strain (D) Stress
Ans: D
70. When mercury is spilled over a smooth horizontal surface, it tends to gather in to droplets why?
(A) Cohesive force is more than adhesive force (B) Adhesive force is more than cohesive force
(C) Both cohesion and adhesion are equal (D) Mercury is a metal
Ans: A
71. Kaplan turbine is an example for :
(A) Tangential flow (B) Radial flow (C) Mixed flow (D) Axial flow
Ans: D
72. For a normal runner Francis turbine, the specific speed is in the range of :
(A) 25 — 30 (B) 250 — 850
(C) 100 — 150 (D) 250 — 400
Ans: C
73. The ideal position of a surge tank in a hydro power station to avoid water hammer in penstocks :
(A) Very near to the reservoir
(B) Very near to the power station
(C) Midpoint of the penstock
(D) At the junction of the tunnel and penstock
Ans: D
74. What type of pump is preferred for pumping drainage water?
(A) Plunger pump (B) Centrifugal pump (C) Jet pump (D) Diaphragm pump
Ans: B
75. When centrifugal pumps are connected in parallel :
(A) Discharge increases (B) Total head increases
(C) Discharge decreases (D) Total head decreases
Ans: A
76. The velocity of flow in a pipe line can be measured by :
(A) Piezometer (B) Rotameter (C) Pitot tube (D) Orifice meter
Ans: C
77. A system in which there is no interaction between system and its surroundings is:
(A) Closed system (B) Open system
(C) Ideal system (D) Isolated system
Ans: D
78. The coordinates to describe the state of a system is called :
(A) Cycle (B) Property (C) Path (D) Process
Ans: B
79. In the absence of any unbalanced force within the system itself and also between the system and surroundings, the system is said to be in :
(A) Thermal equilibrium (B) Chemical equilibrium
(C) Mechanical equilibrium (D) Thermodynamic equilibrium
Ans: C
80. Latent heat of sublimation is the amount of heat transferred to convert a unit mass from :
(A) Vapour to liquid (B) Solid to vapour
(C) Liquid to vapour (D) Vapour to solid
Ans: B
81. A fluid is been throttled though a valve fitted in an insulated pipe, what remains constant?
(A) Pressure (B) Internal energy (C) Enthalpy (D) Entropy
Ans: C
82. It is impossible to construct a device which, operating in a cycle, Will produce no effect other than the transfer of heat from a cooler to a hotter body. Who proposed this statement?
(A) Clausius (B) Kelvin - Plank (C) Carnot (D) J.P.Joule
Ans: A
83. The part of the low grade energy which, according to second law must be rejected is :
(A) Available energy (B) Gibb’s free energy
(C) Exergy (D) Anergy
Ans: D
84. The region inside the inversion curve where Joule - Kelvin coefficient is positive :
(A) Cooling region (B) Heating region
(C) Unchanged region (D) Both (B) and (C)
Ans: A
85. It is impossible by any procedure, no matter how idealized, to reduce any system to the absolute zero of temperature in a finite number of operations. This statement corresponds to :
(A) Zeroth law (B) Third law
(C) First law (D) Second law
Ans: B
86. A process always occurs in such a direction to cause the entropy of the universe :
(A) Remains same (B) Decreases (C) Increases (D) Unpredictable
Ans: C
87. _______________property of a solid would change if it were transported from the earth to the moon.
88. The point where this up thrust acts obviously at the e.g. of the displaced liquid, which is called the ________.
89. Pressure in general is measured in___________ in the C.G.S. system.
90. The cohesive force between the molecules of a liquid can be seen in the phenomenon known as ___________.
91. The branch of science, which deals with the properties and behavior of liquids is called__________.
92. Local atmospheric pressure at a place is measured by an instrument called__________.
93. Three phase induction motor requires ___________ supply
94. D.O.I. starter is used to start _______ motors
A. Compound
B. Alternator
C. Induction
D. Generator
Ans: C
95:- The Phenomenon involved in the working of an optical fibre
A:- Refraction B:- Total internal reflection C:- Diffraction D:- Scattering
Ans: B
96. According to the Beer Lambert’s law, the absorbance of an analyte is directly proportional to
(A) Transmittance (B) Frequency (C) Concentration (D) Power
Ans: C
97. The region of 400 nm - 800 nm corresponds to:
(A) UV-A region (B) UV-B region (C) Visible region (D) IR region
Ans: C
98. Nernst glower is an example of source of radiation of
(A) IR light (B) UV light (C) X-rays (D) Visible light
Ans: A
99. An electron can never be found inside nucleus, this statement true according to:
(A) Heisenberg uncertainty principle (B) Bernoulli’s equation (C) Bohr’s model (D) Both (A) & (B)
Ans: A
100. Nuclear Electron in atom are held in atom due to ...............
(A) coulombs force (B) force (C) atomic force (D) Both (A) & (B)
Ans: A
(A) A force and a torque (B) A force but not a torque
(C) A torque but not a force (D) Neither a force nor a torque
Ans: A
52. An inductor L is allowed to discharge through a capacitor C. The emf induced across the inductor, when the capacitor is fully charged is :
(A) Maximum (B) Minimum
(C) Infinite (D) Zero
Ans: A
53. A capacitor start and capacitor run motors are examples of
- Single phase induction motor
- Three phase induction motors
- Commutator type
- Synchronous motor
54. The electric motors runs on a principle of
- Fleming’s right hand rule
- Fleming’s left hand rule
- Maxwell’s corkscrew rule
- Kirchoff’s current law
55. In a kerosene lamp the oil rise up along the wick due to capillary action. This capillary rise occurs when :
(A) The adhesive force is greater than cohesive force (B) The adhesive force is less than cohesive force
(C) The adhesive force is equal to cohesive force (D) All of the above
Ans: A
56. When small to moderate earthquakes occur certain sound waves are produced. Even though certain animals respond to it, we can’t hear this. This is because, in this case :
(A) Sound waves of greater than 20000 Hz are produced (B) Sound waves of 20 Hz to 20000 Hz are produced
(C) Sound waves of less than 20 Hz are produced (D) None of the above
Ans: C
57. Viscosity is a property of
- Liquid only
- Solids only
- Solids and liquids only
- Liquids and gases only
58. In P- type semi-conductor the majority carrier is:
- Electrons
- Holes
- Protons
- Neutrons
59. ________ is an example of electromagnetic radiation and has the shortest wave length
- Radio waves
- Infrared
- Visible light
- X-rays
60. A leaf which contains only a green pigment is illuminated with monochromatic red light. The leaf will appear to be
- Black
- Brown
- Green
- Yellow
61. The frequency of ultrasound wave is typically
(A) Above 20,000 kHz (B) Below 20 kHz (C) Above 20 kHz (D) Below 2 kHz
Ans: C
62. If three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two. This statement is called :
(A) Converse of the Law of Triangle of forces
(B) Lamie’s Theorem
(C) Law of Triangle of forces
(D) None of these
Ans: B
63. When a body is about to slide down, the inclination of the plane to the horizontal is :
(A) Equal to the angle of friction (B) More than the angle of friction
(C) Less than the angle of friction (D) None of these
Ans: A
64. The ratio of shear stress to shear strain is called :
(A) Young’s modulus (B) Bulk Modulus
(C) Modulus of rigidity (D) Modulus of elasticity
Ans: C
65. In the case of stress strain curve for mild steel bar when conducted a tensile test, strain goes on increasing without an appreciable load, the stress corresponding to this is :
(A) Ultimate stress (B) Fracture stress
(C) Nominal stress (D) Yield stress
Ans: D
66. The maximum strain energy stored per unit volume at elastic limit is :
(A) Stiffness (B) Modulus of resilience (C) Resilience (D) Proof resilience
Ans: D
67. For a solid rectangular column the slenderness ratio is :
(A) Height of column/Maximum width of the column
(B) Length of the column/Height of the column
(C) Height of column/Least side of column
(D) None of these
Ans: C
68. Under torsion, every section of the shaft is subjected to :
(A) Tensile stress (B) Shear stress
(C) Compressive stress (D) Normal stress
Ans: B
69. The internal resistance of a body to external forces/loads that the body is subjected to is called:
(A) Load (B) Pressure
(C) Strain (D) Stress
Ans: D
70. When mercury is spilled over a smooth horizontal surface, it tends to gather in to droplets why?
(A) Cohesive force is more than adhesive force (B) Adhesive force is more than cohesive force
(C) Both cohesion and adhesion are equal (D) Mercury is a metal
Ans: A
71. Kaplan turbine is an example for :
(A) Tangential flow (B) Radial flow (C) Mixed flow (D) Axial flow
Ans: D
72. For a normal runner Francis turbine, the specific speed is in the range of :
(A) 25 — 30 (B) 250 — 850
(C) 100 — 150 (D) 250 — 400
Ans: C
73. The ideal position of a surge tank in a hydro power station to avoid water hammer in penstocks :
(A) Very near to the reservoir
(B) Very near to the power station
(C) Midpoint of the penstock
(D) At the junction of the tunnel and penstock
Ans: D
74. What type of pump is preferred for pumping drainage water?
(A) Plunger pump (B) Centrifugal pump (C) Jet pump (D) Diaphragm pump
Ans: B
75. When centrifugal pumps are connected in parallel :
(A) Discharge increases (B) Total head increases
(C) Discharge decreases (D) Total head decreases
Ans: A
76. The velocity of flow in a pipe line can be measured by :
(A) Piezometer (B) Rotameter (C) Pitot tube (D) Orifice meter
Ans: C
77. A system in which there is no interaction between system and its surroundings is:
(A) Closed system (B) Open system
(C) Ideal system (D) Isolated system
Ans: D
78. The coordinates to describe the state of a system is called :
(A) Cycle (B) Property (C) Path (D) Process
Ans: B
79. In the absence of any unbalanced force within the system itself and also between the system and surroundings, the system is said to be in :
(A) Thermal equilibrium (B) Chemical equilibrium
(C) Mechanical equilibrium (D) Thermodynamic equilibrium
Ans: C
80. Latent heat of sublimation is the amount of heat transferred to convert a unit mass from :
(A) Vapour to liquid (B) Solid to vapour
(C) Liquid to vapour (D) Vapour to solid
Ans: B
81. A fluid is been throttled though a valve fitted in an insulated pipe, what remains constant?
(A) Pressure (B) Internal energy (C) Enthalpy (D) Entropy
Ans: C
82. It is impossible to construct a device which, operating in a cycle, Will produce no effect other than the transfer of heat from a cooler to a hotter body. Who proposed this statement?
(A) Clausius (B) Kelvin - Plank (C) Carnot (D) J.P.Joule
Ans: A
83. The part of the low grade energy which, according to second law must be rejected is :
(A) Available energy (B) Gibb’s free energy
(C) Exergy (D) Anergy
Ans: D
84. The region inside the inversion curve where Joule - Kelvin coefficient is positive :
(A) Cooling region (B) Heating region
(C) Unchanged region (D) Both (B) and (C)
Ans: A
85. It is impossible by any procedure, no matter how idealized, to reduce any system to the absolute zero of temperature in a finite number of operations. This statement corresponds to :
(A) Zeroth law (B) Third law
(C) First law (D) Second law
Ans: B
86. A process always occurs in such a direction to cause the entropy of the universe :
(A) Remains same (B) Decreases (C) Increases (D) Unpredictable
Ans: C
87. _______________property of a solid would change if it were transported from the earth to the moon.
- Mass
- Volume
- Weight
- Destiny
88. The point where this up thrust acts obviously at the e.g. of the displaced liquid, which is called the ________.
- Centripetal
- Centrifugal
- Centre of buoyancy
- Equilibrium
89. Pressure in general is measured in___________ in the C.G.S. system.
- dynes/cm2
- Ib.ft2
- Newton/m2
- Kg’s
90. The cohesive force between the molecules of a liquid can be seen in the phenomenon known as ___________.
- Surface tension
- pH
- RH
- Contact angle
91. The branch of science, which deals with the properties and behavior of liquids is called__________.
- Solvent
- Hydraulics
- Fluid mechanics
- Densitometer
92. Local atmospheric pressure at a place is measured by an instrument called__________.
- pH meter
- Barometer
- Hygrometer
- Thermometer
93. Three phase induction motor requires ___________ supply
- 11 000/240V. 50Hz AC
- 440V, 50Hz AC
- 230V. 50Hz AC
- 220V, 50Hz AC
94. D.O.I. starter is used to start _______ motors
A. Compound
B. Alternator
C. Induction
D. Generator
Ans: C
95:- The Phenomenon involved in the working of an optical fibre
A:- Refraction B:- Total internal reflection C:- Diffraction D:- Scattering
Ans: B
96. According to the Beer Lambert’s law, the absorbance of an analyte is directly proportional to
(A) Transmittance (B) Frequency (C) Concentration (D) Power
Ans: C
97. The region of 400 nm - 800 nm corresponds to:
(A) UV-A region (B) UV-B region (C) Visible region (D) IR region
Ans: C
98. Nernst glower is an example of source of radiation of
(A) IR light (B) UV light (C) X-rays (D) Visible light
Ans: A
99. An electron can never be found inside nucleus, this statement true according to:
(A) Heisenberg uncertainty principle (B) Bernoulli’s equation (C) Bohr’s model (D) Both (A) & (B)
Ans: A
100. Nuclear Electron in atom are held in atom due to ...............
(A) coulombs force (B) force (C) atomic force (D) Both (A) & (B)
Ans: A