MCQOPTIONS
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MCQOPTIONS
This section includes 467 Mcqs, each offering curated multiple-choice questions to sharpen your Railways knowledge and support exam preparation. Choose a topic below to get started.
| 351. |
In a circuit containing two unequal resistors connected in parallel, then |
| A. | the current is same in both the resistors |
| B. | the current is larger in larger resistance |
| C. | the voltage drop is same across both the resistances |
| D. | the voltage drop is larger across larger resistances |
| Answer» D. the voltage drop is larger across larger resistances | |
| 352. |
For which of the following dependence of drift velocity \[{{v}_{d}}\]on electric field E, is Ohm's law obeyed? |
| A. | \[{{v}_{d}}\propto {{E}^{2}}\] |
| B. | \[{{v}_{d}}={{E}^{1/2}}\] |
| C. | \[{{v}_{d}}\]= constant |
| D. | \[{{v}_{d}}=E\] |
| Answer» E. | |
| 353. |
When a potential difference V is applied across a conductor at a temperature T, the drift velocity of electrons is proportional to |
| A. | \[\sqrt{V}\] |
| B. | V |
| C. | \[\sqrt{T}\] |
| D. | T |
| Answer» C. \[\sqrt{T}\] | |
| 354. |
The speed at which the current travels, in conductor, is nearly equal to |
| A. | \[3\times {{10}^{4}}m/s\] |
| B. | \[3\times {{10}^{5}}m/s\] |
| C. | \[4\times {{10}^{6}}m/s\] |
| D. | \[3\times {{10}^{8}}m/s\] |
| Answer» E. | |
| 355. |
Which of the following is used for the formation of thermistor? |
| A. | Copper oxide |
| B. | Nickel oxide |
| C. | Iron oxide |
| D. | All of the above |
| Answer» E. | |
| 356. |
At temperature \[0{}^\circ K\], the germanium behaves as a/an |
| A. | conductor |
| B. | insulator |
| C. | super?conductor |
| D. | ferromagnetic |
| Answer» C. super?conductor | |
| 357. |
If a bulb uses energy of 100 J and remains on for 25 s, power consumed by bulb will be |
| A. | 125 W |
| B. | 4 W |
| C. | 2500 W |
| D. | 75 W |
| Answer» C. 2500 W | |
| 358. |
For two objects A and B, if mass of A is same as mass of B and speed of A is twice as much as that of B, statement that is correct is |
| A. | Kinetic energy of A= kinetic energy of B; because, kinetic energy is independent of speed of object. |
| B. | Since kinetic energy is inversely proportional to speed of object, kinetic energy of A<kinetic energy of B |
| C. | Kinetic energy of A = 1 D 4 \[\times \] Kinetic energy of B |
| D. | Kinetic energy of \[A=4\times \]Kinetic energy of B |
| Answer» E. | |
| 359. |
When spring or rubber band is released it converts potential energy into |
| A. | Mechanical Energy |
| B. | Electrical Energy |
| C. | Thermal energy |
| D. | Kinetic energy |
| Answer» E. | |
| 360. |
In case of negative work, the angle between the force & displacement is: |
| A. | \[0{}^\circ \] |
| B. | \[45{}^\circ \] |
| C. | \[90{}^\circ \] |
| D. | \[180{}^\circ \] |
| Answer» E. | |
| 361. |
If air resistance is negligible, the sum total of potential and kinetic energies of a freely falling body____ |
| A. | increases |
| B. | decreases |
| C. | becomes zero |
| D. | remains the same |
| Answer» E. | |
| 362. |
The work done on an object does not depend on the: |
| A. | Displacement |
| B. | Angle between force and displacement |
| C. | Force applied |
| D. | Initial velocity of the object |
| Answer» E. | |
| 363. |
Water stored in a dam possesses: |
| A. | No energy |
| B. | Electrical energy |
| C. | Kinetic energy |
| D. | Potential energy |
| Answer» E. | |
| 364. |
A 1 kg block is lifted veritically 1 m by a boy. The work done by the boy is |
| A. | 1J |
| B. | 0J |
| C. | 9.8 J |
| D. | 0.IJ |
| Answer» D. 0.IJ | |
| 365. |
During inter-con version of energy from one form to other forms, total energy at any time remains |
| A. | constant |
| B. | zero |
| C. | increasing |
| D. | decreasing |
| Answer» B. zero | |
| 366. |
By burning large amount of fuel, we get |
| A. | petrol |
| B. | heat |
| C. | sound |
| D. | chemicals |
| Answer» C. sound | |
| 367. |
A nuclear power plant uses energy released in nuclear reactor to generate electric power is called |
| A. | fission |
| B. | friction |
| C. | hydrogen |
| D. | mercury |
| Answer» B. friction | |
| 368. |
If a body works at rate of 1 joule per second, then power of that body will be |
| A. | one watt |
| B. | zero watt |
| C. | half watt |
| D. | two watts |
| Answer» B. zero watt | |
| 369. |
If a box is pulled by a rope making an angle with surface then horizontal component of force is equal to |
| A. | F sine |
| B. | F cose |
| C. | F tane |
| D. | None of above |
| Answer» B. F cose | |
| 370. |
Energy can be converted into some other forms but cannot be |
| A. | destroyed |
| B. | decrease |
| C. | increase |
| D. | none of above |
| Answer» B. decrease | |
| 371. |
Power is defined as |
| A. | p = W/'t, where W is work and t is time |
| B. | p = t/W, where t is time and W is work |
| C. | p = W/'d, where W is work and d is distance |
| D. | p = d/W, where d is distance and W is work |
| Answer» B. p = t/W, where t is time and W is work | |
| 372. |
Energy that causes water to evaporate from surface to form water vapors is known as |
| A. | electrical energy |
| B. | thermal energy |
| C. | chemical energy |
| D. | heat energy |
| Answer» C. chemical energy | |
| 373. |
Formula for efficiency is |
| A. | (energy input / energy output)\[\times \]100 |
| B. | (energy input / energy output)\[\times \]100 |
| C. | (useful energy input / energy output)\[\times \]100 |
| D. | (useful energy output / total energy input)\[\times \]100 |
| Answer» E. | |
| 374. |
Food we eat contains |
| A. | Chemical Potential Energy |
| B. | Elastic Potential Energy |
| C. | Gravitational Potential Energy |
| D. | Kinetic energy |
| Answer» B. Elastic Potential Energy | |
| 375. |
One second is defined to be equal to |
| A. | 1650763.73 periods of the Krypton clock |
| B. | 652189.63 periods of the Krypton clock |
| C. | 1650763.73 periods of the Cesium clock |
| D. | 9192631770 periods of the Cesium clock |
| Answer» E. | |
| 376. |
Number of fundamental units in SI system is |
| A. | 4 |
| B. | 7 |
| C. | 3 |
| D. | 5 |
| Answer» C. 3 | |
| 377. |
Unit of surface tension is |
| A. | \[N{{m}^{-1}}\] |
| B. | \[N{{m}^{-2}}\] |
| C. | \[{{N}^{2}}{{m}^{-1}}\] |
| D. | \[N{{m}^{-3}}\] |
| Answer» B. \[N{{m}^{-2}}\] | |
| 378. |
On the basis of dimensional equation, the maximum number of unknown that can be found, is |
| A. | one |
| B. | two |
| C. | three |
| D. | four |
| Answer» D. four | |
| 379. |
The dimensional formula of couple |
| A. | \[M{{L}^{-2}}{{T}^{-2}}\] |
| B. | \[ML{{T}^{-1}}\] |
| C. | \[M{{L}^{-1}}{{T}^{-1}}\] |
| D. | \[M1L1{{T}^{-2}}\] |
| Answer» B. \[ML{{T}^{-1}}\] | |
| 380. |
Which of the following is a possible dimensionless quantity? |
| A. | Velocity gradient |
| B. | Pressure gradient |
| C. | Displacement gradient |
| D. | Force gradient |
| Answer» D. Force gradient | |
| 381. |
If L, C and R represent inductance, capacitance and resistance respectively, then which of the following does not represent dimensions of frequency? |
| A. | \[\frac{1}{RC}\] |
| B. | \[\frac{R}{L}\] |
| C. | \[\frac{1}{\sqrt{LC}}\] |
| D. | \[\frac{C}{L}\] |
| Answer» E. | |
| 382. |
The dimensions of magnetic field in M, L, T and C (coulomb) is given as |
| A. | \[[ML{{T}^{-1}}{{C}^{-1}}]\] |
| B. | \[[M{{T}^{2}}{{C}^{-2}}]\] |
| C. | \[[M{{T}^{-1}}{{C}^{-1}}]\] |
| D. | \[[M{{T}^{-2}}{{C}^{-1}}]\] |
| Answer» D. \[[M{{T}^{-2}}{{C}^{-1}}]\] | |
| 383. |
Out of the following pair, which one does not have identical dimensions? |
| A. | Impulse and momentum |
| B. | Angular momentum and planck's constant |
| C. | Work and torque |
| D. | Moment of inertia and moment of a force (towards north-west) |
| Answer» E. | |
| 384. |
Which one of the following represents the correct dimensions of the coefficient of viscosity? |
| A. | \[[M{{L}^{-1}}{{T}^{-1}}]\] |
| B. | \[[ML{{T}^{-1}}]\] |
| C. | \[[M{{L}^{-1}}{{T}^{-2}}]\] |
| D. | \[[M{{L}^{-2}}{{T}^{-2}}]\] |
| Answer» B. \[[ML{{T}^{-1}}]\] | |
| 385. |
The dimensions of coefficient of self inductance are |
| A. | \[[M{{L}^{2}}{{T}^{-2}}{{A}^{-2}}]\] |
| B. | \[[M{{L}^{2}}{{T}^{-2}}{{A}^{-1}}]\] |
| C. | \[[ML{{T}^{-2}}{{A}^{-2}}]\] |
| D. | \[[ML{{T}^{-2}}{{A}^{-1}}]\] |
| Answer» B. \[[M{{L}^{2}}{{T}^{-2}}{{A}^{-1}}]\] | |
| 386. |
In the relation \[x=\cos (\omega t+kx)\], the dimension(s) of\[\omega \]is/are |
| A. | \[[{{M}^{0}}LT]\] |
| B. | \[[{{M}^{0}}{{L}^{-1}}{{T}^{0}}]\] |
| C. | \[[{{M}^{0}}{{L}^{0}}{{T}^{-1}}]\] |
| D. | \[[{{M}^{0}}L{{T}^{-1}}]\] |
| Answer» D. \[[{{M}^{0}}L{{T}^{-1}}]\] | |
| 387. |
The dimensions of k in the equation W\[=\frac{1}{2}\,\,k{{x}^{2}}\] is |
| A. | \[[M{{L}^{0}}{{T}^{-2}}]\] |
| B. | \[[{{M}^{0}}L{{T}^{-1}}]\] |
| C. | \[[ML{{T}^{-2}}]\] |
| D. | \[[M{{L}^{0}}{{T}^{-1}}]\] |
| Answer» B. \[[{{M}^{0}}L{{T}^{-1}}]\] | |
| 388. |
Dimensions of resistance in an electrical circuit, in terms of dimension of mass M, length L, time T and current I, would be |
| A. | \[[M{{L}^{2}}{{T}^{-2}}]\] |
| B. | \[[M{{L}^{2}}{{T}^{-1}}{{I}^{-1}}]\] |
| C. | \[[M{{L}^{2}}{{T}^{-3}}{{I}^{-2}}]\] |
| D. | \[[M{{L}^{2}}{{T}^{-3}}{{I}^{-1}}]\] |
| Answer» D. \[[M{{L}^{2}}{{T}^{-3}}{{I}^{-1}}]\] | |
| 389. |
The dimensional formula for magnetic flux is |
| A. | \[[M{{L}^{2}}{{T}^{-2}}{{A}^{-1}}]\] |
| B. | \[[M{{L}^{3}}{{T}^{-2}}{{A}^{-2}}]\] |
| C. | \[[{{M}^{0}}{{L}^{-2}}{{T}^{2}}{{A}^{-2}}]\] |
| D. | \[[M{{L}^{2}}{{T}^{-1}}{{A}^{2}}]\] |
| Answer» B. \[[M{{L}^{3}}{{T}^{-2}}{{A}^{-2}}]\] | |
| 390. |
The nuclear cross-section is measured in barn, it is equal to |
| A. | \[{{10}^{-20}}{{m}^{2}}\] |
| B. | \[{{10}^{-30}}{{m}^{2}}\] |
| C. | \[{{10}^{-28}}{{m}^{2}}\] |
| D. | \[{{10}^{-14}}{{m}^{2}}\] |
| Answer» D. \[{{10}^{-14}}{{m}^{2}}\] | |
| 391. |
Unit of moment of inertia in MKS system is |
| A. | \[kg\times c{{m}^{2}}\] |
| B. | \[kg/c{{m}^{2}}\] |
| C. | \[kg\times {{m}^{2}}\] |
| D. | \[joule\times m\] |
| Answer» D. \[joule\times m\] | |
| 392. |
The dimensions of potential energy are |
| A. | \[[ML{{T}^{-1}}]\] |
| B. | \[[M{{L}^{2}}{{T}^{-2}}]\] |
| C. | \[[M{{L}^{-1}}{{T}^{-2}}]\] |
| D. | \[[M{{L}^{-1}}{{T}^{-2}}]\] |
| Answer» C. \[[M{{L}^{-1}}{{T}^{-2}}]\] | |
| 393. |
If L denotes the inductance of an inductor through which a current i is flowing, the dimensions of \[L\,\,{{i}^{2}}\] are |
| A. | \[[M{{L}^{2}}{{T}^{-2}}]\] |
| B. | \[[ML{{T}^{-2}}]\] |
| C. | \[[{{M}^{2}}{{L}^{2}}{{T}^{-2}}]\] |
| D. | Not expressible in M, L, T |
| Answer» B. \[[ML{{T}^{-2}}]\] | |
| 394. |
The dimensional formula for angular momentum is |
| A. | \[[{{M}^{0}}{{L}^{2}}{{T}^{-2}}]\] |
| B. | \[[M{{L}^{2}}{{T}^{-1}}]\] |
| C. | \[[ML{{T}^{-1}}]\] |
| D. | \[[M{{L}^{2}}{{T}^{-2}}]\] |
| Answer» C. \[[ML{{T}^{-1}}]\] | |
| 395. |
The dimensions of Planck's constant are same as |
| A. | energy |
| B. | power |
| C. | momentum |
| D. | angular momentum |
| Answer» E. | |
| 396. |
The dimensional formula of torque is |
| A. | \[[M{{L}^{2}}{{T}^{-2}}]\] |
| B. | \[[ML{{T}^{-2}}]\] |
| C. | \[[M{{L}^{-1}}{{T}^{-2}}]\] |
| D. | \[[M{{L}^{-2}}{{T}^{-2}}]\] |
| Answer» B. \[[ML{{T}^{-2}}]\] | |
| 397. |
The dimensions of Reynold's constant are |
| A. | \[[{{M}^{0}}{{L}^{0}}{{T}^{0}}]\] |
| B. | \[[M{{L}^{-1}}{{T}^{-1}}]\] |
| C. | \[[M{{L}^{-1}}{{T}^{-2}}]\] |
| D. | \[[M{{L}^{-2}}{{T}^{-2}}]\] |
| Answer» B. \[[M{{L}^{-1}}{{T}^{-1}}]\] | |
| 398. |
What is the numerical ratio of velocity to speed of an object? |
| A. | Always equal to one |
| B. | Always less than one |
| C. | Always greater than one |
| D. | Either less than or equal to one. |
| Answer» E. | |
| 399. |
Which of the following is the correct definition for Average speed? |
| A. | Average speed \[=\frac{\text{total}\,\,\text{displacement}}{\text{total}\,\,\text{time}}\] |
| B. | Average speed \[=\frac{\text{total}\,\,\text{path}\,\,\text{length}}{\text{total}\,\,\text{time}}\] |
| C. | Average speed \[=\frac{\text{change}\,\,\text{in}\,\,\text{speed}}{\text{total}\,\,\text{time}}\] |
| D. | Average speed \[=\frac{\text{sum}\,\,\text{of}\,\,\text{all}\,\,\text{the}\,\,\text{speed}}{\text{total}\,\,\text{time}}\] |
| Answer» C. Average speed \[=\frac{\text{change}\,\,\text{in}\,\,\text{speed}}{\text{total}\,\,\text{time}}\] | |
| 400. |
Suppose you are in a car going due east on a straight highway at a constant speed of 30 mph. Which of the following is NOT true? |
| A. | You and the car's distance is constantly changing |
| B. | Your speed is constant |
| C. | Your velocity is constant |
| D. | Your direction is constantly changing |
| Answer» E. | |