4. Normal force acting per unit cross sectional area is called
Correct : B. pressure
5. Ratio of tensile to strain is
Correct : A. Young's modulus
6. Gradient of force-extension graph is
Correct : D. force constant
7. Energy in deformed solid is called
Correct : D. strain energy
8. Units of stress are
Correct : C. Pascal
9. Concentration of matter in a material is
Correct : C. density
10. Units of strain are
Correct : D. no units
11. Stress is force applied on
Correct : B. cross sectional area
12. The larger the spring constant, the spring would be more
Correct : B. stiffer
13. Height of atmosphere, if atmospheric density is 1.29 kg m-3 and atmospheric pressure is 101 kPa, is {{}}
Correct : B. 7829.4 m
14. Pressure in fluid depends upon
Correct : D. all of above
15. As depth increases, pressure in a fluid
Correct : A. increases
16. If extension in spring is proportional to load applied, then material
obeys
Correct : D. Hooke's law
17. If a spring is squashed, then forces are
Correct : B. compressive
18. Fractional increase in original length is called
Correct : B. strain
19. If a force of 50 N is applied across the cross-sectional area of 5 × 10 - 7m2 then stress applied on it is {{}}
Correct : A. 1 × 10 8 Pa
20. Mass of steel sphere having density 7850 kg m-3 and radius 0.15 m is
Correct : C. 110.9 kg
21. In a force-extension graph, force is taken along horizontal axis
because
Correct : A. force is independent variable
22. Extension and applied force are
Correct : A. directly proportional
23. 1 Pa is equal to
Correct : D. 1 N m-2
24. Spring constant of spring is also called
Correct : C. stiffness
25. Tensile strain is equal to
Correct : C. Extension per unit length
26. In elastic collisions,
Correct : C. both of the momentum and total kinetic energy are conserved.
27. Total angular momentum of a body is given by
Correct : A. I × ω; where I: moment of inertia of the body, ω: angular velocity
28. Force that acts on a mass of 1 g and gives it an acceleration of 1 cm s -2 is defined as {{}}
Correct : B. 1 dyne
29. An object moving in a circle of radius ‘r’ with a constant speed ‘v’ has a constant acceleration towards the center equal to
Correct : A. v²⁄r
30. Einstein's mass-energy relationship states that if the mass decreases by Δm, the energy released ΔE is given by {{}}
Correct : B. ΔE = Δm × c², where "c" denotes the speed of light.
31. Bernoulli's principle states that, for streamline motion of an incompressible non-viscous fluid:
Correct : D. the pressure at any part + the kinetic energy per unit volume + the potential energy per unit volume = constant
32. While Young's modulus ‘E’ relates to change in length and bulk modulus ‘K’ relates to change in volume, modulus of rigidity ‘G’ relates to change in:
Correct : C. shape
33. Young's modulus is defined as
Correct : B. tensile stress/tensile strain
34. Velocity of escape is equal to
Correct : D. √(2gr); where r: radius of Earth or any other planet for that matter, g: gravitational field strength
35. Speed ‘v’ with which wave travels through a medium is given by
Correct : C. √(modulus of elasticity/density of the medium
36. Hooke's law states that
Correct : A. the extension is proportional to the load when the elastic limit is not exceeded
37. Dimensions of strain are {{}}
Correct : D. It's a dimensionless quantity
38. Due to energy dissipation by viscous forces in air, if simple harmonic variations of a pendulum die away after some time, then oscillation is said to be:
Correct : C. damped
39. At ‘yield point’ of a copper wire
Correct : B. the load has already exceeded the elastic limit and the material has become plastic
40. Stationary waves are also called
Correct : B. standing waves
41. When the work done in moving a particle round a closed loop in a field is zero, the forces in the field are called
Correct : C. Conservative forces
42. Substances that elongate considerably and undergo plastic
deformation before they break are known as
Correct : C. ductile substances
43. 1 torr is equal to
Correct : B. 1 mm Hg
44. Velocity of sound waves through any material depends on
Correct : B. the material's density ‘d’ as well as its modulus of elasticity ‘E’
45. Period of simple harmonic motion of a spiral spring or elastic thread is given by
Correct : D. T = 2π × √(extension produced/gravitational field strength
46. In order to slip one surface over another, maximum frictional force has to be overcome, this maximum frictional force between the two surfaces is also known as
Correct : C. limiting frictional force
47. Van der Waals derived an expression for the ‘pressure defect’, if the observed pressure is denoted as ‘p’ and volume is denoted as ‘V’, the gas pressure in the bulk of the gas is equal to:
Correct : B. p + a/(V²); where a: constant for the particular gas
48. "Upthrust = Weight of the liquid displaced" is known as
Correct : B. Archimedes' Principle
49. Assuming uniform density of the core, the acceleration due to gravity below the Earth's surface is
Correct : D. directly proportional to the distance from the center of the Earth
50. When a gas or a liquid is subjected to an increased pressure, the substance contracts, the bulk strain is defined as
Correct : C. change in volume ⁄ original volume
51. Tensile stress is equal to
Correct : A. Force per unit area
52. Dimensions of relative density are
Correct : C. It has no dimensions, since it's a ratio of two densities
53. Dimensions of gravitational constant ‘G’ are: {{}}
Correct : A. [M]-1[L]3[T]-2
54. A person of mass ‘m’ kg jumps from a height of ‘h’ meters, he will
land on the ground with a velocity equal to:
Correct : A. √(2 × g × h
55. In linear motion, the energy is given by 1⁄2mv 2. Similarly, in rotational motion, the rotational energy is given by {{}}
Correct : C. 1/2 × I × ω²; where I: moment of inertia of the body, ω: angular velocity
56. Boyle's law states that
Correct : A. pressure of a gas is inversely proportional to its volume i.e. P × V = constant
57. Isothermal bulk modulus is equal to
Correct : B. Pressure
58. Adiabatic bulk modulus is equal to:
Correct : A. Υ × P; where Υ: the ratio of the specific heat capacities of the gas, P: pressure
59. Bernoulli's principle shows that, at points in a moving fluid where the potential energy change is very small
Correct : B. the pressure is low where the velocity is high and conversely, the pressure is high where the velocity is low
60. 1 N (newton) is equal to {{}}
Correct : D. 105 dynes
61. Torricelli's theorem states that the velocity ‘v’ of the liquid emerging from the bottom of the wide tank is given by √(2gh). In practice, this velocity is:
Correct : C. lesser than √(2gh
62. Dimensions of Young's modulus are {{}}
Correct : D. [M] [L]-1[T]-2
63. Kepler's 3rd law states that...
Correct : C. the squares of the periods of revolution of the planets are proportional to the cube of their mean distance from sun
64. Gradual decrease in x-ray beam intensity as it passes through material
is called
Correct : A. attenuation
65. Attenuation coefficient of bone is 600 m-1 for x-rays of energy 20 keV and intensity of beam of x-rays is 20 Wm-2, then intensity of beam after passingthrough a bone of 4mm is {{}}
Correct : D. 1.8 Wm-2
66. For protons, the gyromagnetic ratio has the value {{}}
Correct : B. 2.68 × 108rads-1 T-1
67. Energy passing through unit area is
Correct : A. intensity of x-ray
68. speed of ultrasound depends upon
Correct : C. material
69. Bones look white in x-ray photograph because
Correct : C. they are good absorbers of x-rays
70. Larmor frequency depends upon the
Correct : C. both A and B
71. Acoustic impedance of human skin is {{}}
Correct : B. 1.71 × 106 kg m-2 s-1
72. In the best piezo-electric substances, the maximum value of strain is
about
Correct : D. 0.1 %
73. With gel between skin and transducer percentage of reflected intensity
of ultrasonic is
Correct : A. 0.03%
74. Attenuation coefficient depends on
Correct : C. energy of x-ray photons
75. x-rays are filtered out of human body by using
Correct : D. aluminum absorbers
76. Wavelength of x-rays is in range
Correct : A. 10 -8 to 10 -13 m
77. If fast moving electrons rapidly decelerate, then rays produced are
Correct : D. x-rays
78. As the x-rays pass through matter, it's intensity
Correct : B. decreases
79. X-rays have
Correct : C. both A and B
80. Acoustic impedance is defined as
Correct : B. ρc
81. A sound wave which has frequency higher than the upper limit of human hearing is
Correct : B. ultrasonic
82. Fatty tissues have
Correct : D. relaxation times of several hundred milliseconds
83. Angular frequency of precision is called
Correct : C. Larmor frequency
84. Scattered x-ray beams approach the detector screen
Correct : D. at an angle
85. Maximum energy an x-ray photon can have is {{}}
Correct : C. eV
86. Soft x-rays have
Correct : B. low energies
87. Intensity of x-rays can be increased by increasing
Correct : B. current
88. Bone thickness is equal to {{}}
Correct : A. cΔt/2
89. Hardness of x-ray beam can be increased by increasing
Correct : A. voltage
90. In x-ray production, the kinetic energy of an electron arriving at anode is
Correct : B. 200 keV
91. Change in speed of ultrasound causes
Correct : C. refraction
92. Type of x-rays used to detect break in bone is
Correct : A. hard
93. Wavelength of 2.0 MHz ultrasound waves in tissue is
Correct : A. 7.5 × 10-4 m
94. Intensifier screens reduces the patient's exposure to x-rays by a factor of
Correct : C. 100-500
95. Contrast media consist of elements with
Correct : B. higher atomic number
96. Thickness of material which decreases intensity of x-ray material to
half of original value is
Correct : B. half thickness
97. A good x-ray source should produce x-rays of narrow beam and
Correct : A. parallel x-rays
98. Speed of Earth when a rock of mass 60 kg falling towards Earth with speed of 20 m s-1 is {{}}
Correct : C. −2.0 × 10-22 m s-1
99. Force exerted by bat on ball if it strikes a ball of mass 0.16 kg initially hits bat with speed of 25 m s-1 with time impact of 0.003 s is {{}}
Correct : B. 1333.33 N
100. Momentum of electron having mass 9.1 × 10 -31 kg and velocity 2.0 ×107 is {{}}