MDCAT Physics MCQ's Test With Answers

MDCAT Physics MCQ's Test

Sr. # Questions Answers Choice
1 The ratio of stress/strain is called as Modulus of elasticity Bulk modulus Shear modulus Young's modulus
2 The ratio of linear stress/linear strain is called as Young's modulus Bulk modulus Shear modulus Modulus
3 The strain is the ratio of Stress/strain Strain/stress Force area change in length/original length
4 The deformation measured in terms of some twisting angle due to action of stress is known as Stress Linear stress Compressive stress Shear stress
5 The stress which increase the length in one dimension only is called length stress only have compressive stress Have both tensile and compression stress None of them
6 A solid subjected to deformation along one dimension Only have tensile stress Only have compressive stress Have both tensile and compressive stress None of them
7 The measure of deformation in a certain solid due to the action of stress is called Hooke's law Mechanical advantage Stress Strain
8 The ability of anybody to return, to its original shape is called Elasticity Elastic force Stress Strain
9 A wire of 100 mm length and 1 mm2surface area stretches 10 mm under a load of 60 N. A second wire of same material, with half the diameter of the first wire is stretched by the same load. What is the extension in the second wire? 20 mm 30 mm 40 mm 50 mm
10 The young modulus of steel is greater than that of aluminium.
Keeping the statement above in mind state which of the following is true
 Steel requires a larger stress on it for a given strain than does aluminium Aluminium requires more force than steel does to get a similar extension as steel Steel requires less force than aluminium does to get a similar extension as aluminium Steel requires a larger strain on it for a given stress than does aluminium
11 The high-tensile steel used to support the roadway of a suspension bridge breaks under a stress of 2 x 109Pa. Find the minimum cross-sectional area for a cable if it is to support a load of mass 2 x 105kg.
(g = 10 N kg-1)
 10<sup>-2</sup>m<sup>2</sup> 10<sup>-1</sup>m<sup>2</sup> 10<sup>-4</sup>m<sup>2</sup> 10<sup>-3</sup>m<sup>2</sup>
12 Which of the following pair of quantities do not have the same units? Stress, Young's modulus Strain, bulk modulus Stress, bulk modulus None of them
13 A rubber cord 100 cm long is elongated 1 cm by a stretching force of 0.2 N. The cross-sectional area of the cord is 0.04 cm2. Find the Young's modulus for that rubber. 0.5 N cm<sup>-2</sup> 0.05 N cm<sup>-2</sup> 50 N cm<sup>-2</sup> 500 N cm<sup>-2</sup>
14 Which of the following pair of quantities have the same units? stress, Young's modulus Young's modulus, bulk modulus Stress, bulk modulus All of them
15 220 cm3of water, when subjected to a stress of 100 atmosphere, becomes 219 cm3. Find the bulk modulus of water 100 N m<sup>-3</sup> 100 N m<sup>-2</sup> 22000 N m<sup>-3</sup> 22000 N m<sup>-2</sup>
16 What is the bulk modulus of a material? strain/volumetric strain volumetric stress/strain stress/volumetric strain volumetric stress/volumetric strain
17 What is the Young modulus of a meta? Extension/force Force/extension Strain/stress Stress/strain
18 What is the unit of the Young's modulus? N m<sup>-2</sup> N m<sup>-1</sup> N m N m<sup>2</sup>
19 The cores of electromagnets used for alternating currents where the specimen repeatedly undergoes magnetization and demagnetization should have broad hysteresis curves narrow hysteresis curves any one of the them none of them
20 To make a permanent magnet, a material should have hihg retentivety and small coercive force low retentivety and high coercive force low retentivety and small coercive force high retentivety and high coercive force
21 The energy dissipated per cycle for iron in hysteresis loop is less than for steel equal to the steel more than the steel any one of them
22 The coercivity of the steel is less than the iron equal to the iron more than the iron any one of them
23 In the hysteresis loop, when the current is reduced to zero, the material does not retain magnetism retains not retain magnetism retains strong magnetism none of them
24 In the phenomenon of hysteresis. magnetism leads the magnetising current magnetism lags behind the magnetising current magnetism goes along the magnetising current none of them
25 The curie temperature of iron is called 250<span style="font-weight: bold; color: rgb(106, 106, 106); font-family: arial, sans-serif; font-size: small;">°C</span> 500<span style="font-weight: bold; color: rgb(106, 106, 106); font-family: arial, sans-serif; font-size: small;">°</span><span style="color: rgb(106, 106, 106); font-family: arial, sans-serif; font-size: small;">C</span> 750<span style="font-weight: bold; color: rgb(106, 106, 106); font-family: arial, sans-serif; font-size: small;">°C</span> 1000<span style="font-weight: bold; color: rgb(106, 106, 106); font-family: arial, sans-serif; font-size: small;">°C</span>
26 Above the curie temperature, iron becomes ferromagnetic paramagnetic diamagnetic any one of them
27 Ferromagnetic substances lose their magnetism when heated above a certain temperature, known as critical temperature curie temperature high temperature fixed temperature
28 Which of the following can become a good temporarily magnet? iron steel both of them none of them
29 Which of the following can become a good permanent magnet? iron steel both of them none of them
30 In a soft iron, domains are easily oriented along external field and do not return to original random positions easily oriented along external field and readily returns to originally random positions do not oriented along external field and also do not returns to original random position none of them
31 Within each domain, the magnetic fields of all the spinning electrons are parallel antiparallel perpendicular all of them
32 The size of the domains in such that they can contain 10<sup>2</sup>to 10<sup>4</sup>atoms 10<sup>4</sup>to 10<sup>8</sup>atoms 10<sup>8</sup>to 10<sup>12</sup>atoms 10<sup>12</sup>to 10<sup>16</sup>atoms
33 The domains are of macroscopic size of the order of centimetres metres millimetres nanometres
34 Recent studies of ferromagnetism have shown that there exists in ferromagnetic substances small regions called tiny regions domains vectors none of them
35 Iron, cobalt and nickle are examples of diamagnetic substances ferromagnetic substances paramagnetic substances all of them
36 The substances in which atoms cooperate with each other in such a way so as to exhibit a strong magnetic effect, are called diamagnetic substances ferromagnetic substances paramagnetic substances all of them
37 The substances in which atoms are so oriented that the field produced by spin and orbital motion of the electrons might add up to zero, are called diamagnetic substances ferromagnetic substances paramagnetic substances all of them
38 The substances in which, atom are so oriented that their field support each other and the atoms behave like tiny magnets, are called diamagnetic substances ferromagnetic substances paramagnetic substances all of them
39 The charged nucleus of an atom itself spins, it's magnetic field equals the field produced by orbital electrons greater than the field produced by orbital electrons much weaker than the field produced by orbital electrons none of them
40 An atom in which there is a resultant magnetic field, behaves like a tiny magnet and is called as magnetic magnetic dipole magnetic monopole none of them
Download This Set

Is this page helpful?