

McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Uncategorized topics .
Chapters
351. |
Tensile stress is equal to |
A. | Force per unit area |
B. | Force per unit volume |
C. | Extension per unit length |
D. | Extension per unit area |
Answer» A. Force per unit area |
352. |
Dimensions of relative density are |
A. | mass × length-3 |
B. | mass × length3 |
C. | It has no dimensions, since it's a ratio of two densities |
D. | length 3 × mass -1 |
Answer» C. It has no dimensions, since it's a ratio of two densities |
353. |
Dimensions of gravitational constant ‘G’ are: {{}} |
A. | [M]-1[L]3[T]-2 |
B. | [M] [L]3[T]-2 |
C. | [M]-1[L]2[T]-1 |
D. | [M] [L]-1[T]2 |
Answer» A. [M]-1[L]3[T]-2 |
354. |
A person of mass ‘m’ kg jumps from a height of ‘h’ meters, he will land on the ground with a velocity equal to: |
A. | √(2 × g × h |
B. | 1/h × √(2 × g |
C. | 2gh |
D. | 2√(g × h |
Answer» A. √(2 × g × h |
355. |
In linear motion, the energy is given by 1⁄2mv 2. Similarly, in rotational motion, the rotational energy is given by {{}} |
A. | 1/2 × I × ω; where I: moment of inertia of the body, ω: angular velocity |
B. | 1/2 × I² × ω; where I: moment of inertia of the body, ω: angular velocity |
C. | 1/2 × I × ω²; where I: moment of inertia of the body, ω: angular velocity |
D. | 1/2 × I² × ω²; where I: moment of inertia of the body, ω: angular velocity |
Answer» C. 1/2 × I × ω²; where I: moment of inertia of the body, ω: angular velocity |
356. |
Boyle's law states that |
A. | pressure of a gas is inversely proportional to its volume i.e. P × V = constant |
B. | pressure of a gas is directly proportional to its volume i.e. P⁄V = constant |
C. | pressure of a gas is inversely proportional to the square of its volume i.e. P × V² = constant |
D. | pressure of a gas is directly proportional to the square of its volume i.e. P ⁄ V² = constant |
Answer» A. pressure of a gas is inversely proportional to its volume i.e. P × V = constant |
357. |
Isothermal bulk modulus is equal to |
A. | Υ × P; where Υ: the ratio of the specific heat capacities of the gas, P: pressure |
B. | Pressure |
C. | The ratio of the specific heat capacities of the gas |
D. | Υ ⁄ P; where Υ: the ratio of the specific heat capacities of the gas, P: pressure |
Answer» B. Pressure |
358. |
Adiabatic bulk modulus is equal to: |
A. | Υ × P; where Υ: the ratio of the specific heat capacities of the gas, P: pressure |
B. | Pressure |
C. | The ratio of the specific heat capacities of the gas |
D. | Υ ⁄ P; where Υ: the ratio of the specific heat capacities of the gas, P: pressure |
Answer» A. Υ × P; where Υ: the ratio of the specific heat capacities of the gas, P: pressure |
359. |
Bernoulli's principle shows that, at points in a moving fluid where the potential energy change is very small |
A. | the pressure is low where the velocity is low and similarly, the pressure is high where the velocity is high |
B. | the pressure is low where the velocity is high and conversely, the pressure is high where the velocity is low |
C. | pressure becomes independent of the velocity of the moving fluid |
D. | pressure remain independent of the speed of the stationary fluid |
Answer» B. the pressure is low where the velocity is high and conversely, the pressure is high where the velocity is low |
360. |
1 N (newton) is equal to {{}} |
A. | 102 dynes |
B. | 103 dynes |
C. | 104 dynes |
D. | 105 dynes |
Answer» D. 105 dynes |
361. |
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: |
A. | equal to √(2gh |
B. | greater than √(2gh |
C. | lesser than √(2gh |
D. | independent of height and gravitational field strength |
Answer» C. lesser than √(2gh |
362. |
Dimensions of Young's modulus are {{}} |
A. | [M]-1[L]-1[T]-2 |
B. | [M]-1[L]-2[T]-2 |
C. | [M] [L]-2[T]-2 |
D. | [M] [L]-1[T]-2 |
Answer» D. [M] [L]-1[T]-2 |
363. |
Kepler's 3rd law states that... |
A. | the periods of revolution of the planets are proportional to the cube of their mean distances from sun |
B. | the periods of revolution of the planets are inversely proportional to the cube of their mean distances from sun |
C. | the squares of the periods of revolution of the planets are proportional to the cube of their mean distance from sun |
D. | the squares of the periods of revolution of the planets are inversely proportional to the cube of their mean distance from sun |
Answer» C. the squares of the periods of revolution of the planets are proportional to the cube of their mean distance from sun |
364. |
Gradual decrease in x-ray beam intensity as it passes through material is called |
A. | attenuation |
B. | decay |
C. | radioactivity |
D. | imaging |
Answer» A. attenuation |
365. |
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 {{}} |
A. | 3 Wm-2 |
B. | 2.5 Wm-2 |
C. | 2.0 Wm-2 |
D. | 1.8 Wm-2 |
Answer» D. 1.8 Wm-2 |
366. |
For protons, the gyromagnetic ratio has the value {{}} |
A. | 3 × 108rads-1 T-1 |
B. | 2.68 × 108rads-1 T-1 |
C. | 4 × 108rads-1 T-1 |
D. | 5 × 108rads-1 T-1 |
Answer» B. 2.68 × 108rads-1 T-1 |
367. |
Energy passing through unit area is |
A. | intensity of x-ray |
B. | frequency of x-ray |
C. | wavelength of x-ray |
D. | amplitude of x-ray |
Answer» A. intensity of x-ray |
368. |
speed of ultrasound depends upon |
A. | medium |
B. | amplitude |
C. | material |
D. | wavelength |
Answer» C. material |
369. |
Bones look white in x-ray photograph because |
A. | they are bad absorbers of x-rays |
B. | they reflect x-rays |
C. | they are good absorbers of x-rays |
D. | they are bad absorbers of ultraviolet rays |
Answer» C. they are good absorbers of x-rays |
370. |
Larmor frequency depends upon the |
A. | individual nucleus |
B. | magnetic flux density |
C. | both A and B |
D. | energetic flux unit |
Answer» C. both A and B |
371. |
Acoustic impedance of human skin is {{}} |
A. | 1.65 × 106 kg m2 s-1 |
B. | 1.71 × 106 kg m-2 s-1 |
C. | 2 × 10 6 kg m-2 s-1 |
D. | 2 × 107 kg m-3 s-2 |
Answer» B. 1.71 × 106 kg m-2 s-1 |
372. |
In the best piezo-electric substances, the maximum value of strain is about |
A. | 0.5 % |
B. | 0.4 % |
C. | 0.3 % |
D. | 0.1 % |
Answer» D. 0.1 % |
373. |
With gel between skin and transducer percentage of reflected intensity of ultrasonic is |
A. | 0.03% |
B. | 0.05% |
C. | 0.06% |
D. | 0.08% |
Answer» A. 0.03% |
374. |
Attenuation coefficient depends on |
A. | frequency of x-ray photons |
B. | wavelength of x-ray photons |
C. | energy of x-ray photons |
D. | amplitude of x-ray photons |
Answer» C. energy of x-ray photons |
375. |
x-rays are filtered out of human body by using |
A. | cadmium absorbers |
B. | carbon absorbers |
C. | copper absorbers |
D. | aluminum absorbers |
Answer» D. aluminum absorbers |
376. |
Wavelength of x-rays is in range |
A. | 10 -8 to 10 -13 m |
B. | 10 -7 to 10 -14 m |
C. | 10 -10 to 10 -15 m |
D. | 10 2 to 10 9 m |
Answer» A. 10 -8 to 10 -13 m |
377. |
If fast moving electrons rapidly decelerate, then rays produced are |
A. | alpha rays |
B. | beta rays |
C. | gamma rays |
D. | x-rays |
Answer» D. x-rays |
378. |
As the x-rays pass through matter, it's intensity |
A. | increases |
B. | decreases |
C. | remains constant |
D. | may increase or decrease depending on the object |
Answer» B. decreases |
379. |
X-rays have |
A. | short wavelength |
B. | high frequency |
C. | both A and B |
D. | longest wavelength |
Answer» C. both A and B |
380. |
Acoustic impedance is defined as |
A. | ρ⁄c |
B. | ρc |
C. | c⁄ρ |
D. | ρ+c |
Answer» B. ρc |
381. |
A sound wave which has frequency higher than the upper limit of human hearing is |
A. | infra sonic |
B. | ultrasonic |
C. | supersonic |
D. | megasonic |
Answer» B. ultrasonic |
382. |
Fatty tissues have |
A. | relaxation time of several seconds |
B. | relaxation time of several hundred nanoseconds |
C. | intermediate relaxation times |
D. | relaxation times of several hundred milliseconds |
Answer» D. relaxation times of several hundred milliseconds |
383. |
Angular frequency of precision is called |
A. | Lower frequency |
B. | higher frequency |
C. | Larmor frequency |
D. | linear frequency |
Answer» C. Larmor frequency |
384. |
Scattered x-ray beams approach the detector screen |
A. | perpendicularly |
B. | parallel |
C. | anti-parallel |
D. | at an angle |
Answer» D. at an angle |
385. |
Maximum energy an x-ray photon can have is {{}} |
A. | e⁄V |
B. | e |
C. | eV |
D. | V |
Answer» C. eV |
386. |
Soft x-rays have |
A. | high energies |
B. | low energies |
C. | lowest frequency |
D. | longest wavelength |
Answer» B. low energies |
387. |
Intensity of x-rays can be increased by increasing |
A. | frequency |
B. | current |
C. | voltage |
D. | resistance |
Answer» B. current |
388. |
Bone thickness is equal to {{}} |
A. | cΔt/2 |
B. | cΔt |
C. | c/t |
D. | t/2 |
Answer» A. cΔt/2 |
389. |
Hardness of x-ray beam can be increased by increasing |
A. | voltage |
B. | current |
C. | frequency |
D. | wavelength |
Answer» A. voltage |
390. |
In x-ray production, the kinetic energy of an electron arriving at anode is |
A. | 100 keV |
B. | 200 keV |
C. | 300 keV |
D. | 400 keV |
Answer» B. 200 keV |
391. |
Change in speed of ultrasound causes |
A. | reflection |
B. | diffraction |
C. | refraction |
D. | image |
Answer» C. refraction |
392. |
Type of x-rays used to detect break in bone is |
A. | hard |
B. | soft |
C. | both A and B |
D. | moderate |
Answer» A. hard |
393. |
Wavelength of 2.0 MHz ultrasound waves in tissue is |
A. | 7.5 × 10-4 m |
B. | 8 × 10-5 m |
C. | 8.5 × 10-6 m |
D. | 9.2 × 10-3 m |
Answer» A. 7.5 × 10-4 m |
394. |
Intensifier screens reduces the patient's exposure to x-rays by a factor of |
A. | 500-600 |
B. | 1000-2000 |
C. | 100-500 |
D. | 10-100 |
Answer» C. 100-500 |
395. |
Contrast media consist of elements with |
A. | lower atomic number |
B. | higher atomic number |
C. | metalloids |
D. | inert gases |
Answer» B. higher atomic number |
396. |
Thickness of material which decreases intensity of x-ray material to half of original value is |
A. | quarter thickness |
B. | half thickness |
C. | half life |
D. | 2 times of thickness |
Answer» B. half thickness |
397. |
A good x-ray source should produce x-rays of narrow beam and |
A. | parallel x-rays |
B. | perpendicular x-rays |
C. | anti-parallel x-rays |
D. | anti-perpendicular x-rays |
Answer» A. parallel x-rays |
398. |
Speed of Earth when a rock of mass 60 kg falling towards Earth with speed of 20 m s-1 is {{}} |
A. | 2.4 × 10-22 m s-1 |
B. | 3.5 × 10-33 m s-1 |
C. | −2.0 × 10-22 m s-1 |
D. | −3 × 1034 m s-1 |
Answer» C. −2.0 × 10-22 m s-1 |
399. |
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 {{}} |
A. | 145 N |
B. | 1333.33 N |
C. | 1456.7 N |
D. | 6543 N |
Answer» B. 1333.33 N |
400. |
Momentum of electron having mass 9.1 × 10 -31 kg and velocity 2.0 ×107 is {{}} |
A. | 1.91 × 10-23 |
B. | 2.34 × 10-23 |
C. | 3.11 × 10-19 |
D. | 7.88 × 10-34 |
Answer» A. 1.91 × 10-23 |
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