MCQOPTIONS
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MCQOPTIONS
This section includes 778 Mcqs, each offering curated multiple-choice questions to sharpen your Physics Mcqs knowledge and support exam preparation. Choose a topic below to get started.
| 351. |
n an LCR series circuit, if V is the effective value of the applied voltage VR is the voltage across R VL is the effective voltage across L & Vc is the effective voltage across C |
| A. | V = VR+VL+VC |
| B. | V2 = VR2+VL2+VC2 |
| C. | V2 = VR2+(VL-VC)2 |
| D. | V2 = VL2+(VR-VC)2 |
| Answer» D. V2 = VL2+(VR-VC)2 | |
| 352. |
Two identical coaxial circular loops carry equal currents in the same direction. If the loops approach each other the current in______________? |
| A. | Each increase |
| B. | Each decrease |
| C. | Each remains the same |
| D. | One increases whereas that in the other decreases |
| Answer» C. Each remains the same | |
| 353. |
A voltage V = V0 cos ωt is applied across a resistor of resistance R the average power dissipated per cycle in the resistor is given by___________? |
| A. | V√/√2R |
| B. | V/√2√R |
| C. | V02/√2R |
| D. | 2/√2√R |
| Answer» D. 2/√2√R | |
| 354. |
The uncertainty in momentum & position is due to its_____________? |
| A. | Property of matter and radiation |
| B. | Two-dimensional motion |
| C. | Emission of the certain wavelength |
| D. | Very high velocity |
| Answer» B. Two-dimensional motion | |
| 355. |
An inductor may store energy in ________________? |
| A. | Its electric field |
| B. | Its coils |
| C. | Its magnetic field |
| D. | Both electric and magnetic fields |
| Answer» D. Both electric and magnetic fields | |
| 356. |
Addition of vector obeys_____________? |
| A. | Commutative law |
| B. | Distributive law |
| C. | Associative law |
| D. | All given laws in A, B and C |
| Answer» E. | |
| 357. |
Maximum number of components of a vector may be________________? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | Infinite |
| Answer» E. | |
| 358. |
The direction of a vector in space is specified by_______________? |
| A. | One angle |
| B. | Two angle |
| C. | Three angle |
| D. | No angle |
| Answer» D. No angle | |
| 359. |
Cosθi^ + Sinθj^ is a_________________? |
| A. | Vector |
| B. | Position Vector |
| C. | Vector in the direction at angle θ with an x-axis |
| D. | The unit vector in the direction at angle θ with an x-axis |
| Answer» E. | |
| 360. |
The unit vector in the direction of vector A = 2 i^ -2j^ + k^ is_______________? |
| A. | 2i^ – 2j^ + k^ |
| B. | (2i^ – 2j^ +k^)/9 |
| C. | (2i^ – 2j^ +k^)/3 |
| D. | (2i^ – 2j^ +k^)/5 |
| Answer» D. (2i^ – 2j^ +k^)/5 | |
| 361. |
Which one is not correct for a vector A= 2i+2j+3k ? |
| A. | Has direction 45° with an x-axis |
| B. | Has magnitude 2 |
| C. | Has magnitude 2 and direction °=45° with a y-axis |
| D. | Has magnitude -2 |
| Answer» E. | |
| 362. |
The cross product i^ x j^ is equal to_______________? |
| A. | Zero |
| B. | One |
| C. | i^ |
| D. | k^ |
| Answer» E. | |
| 363. |
It is easier to turn a steering wheel with both hands than with a single hand because______________? |
| A. | Accelerating force increases on the wheel |
| B. | Two forces act on the wheel |
| C. | Two hands provide a firm grip |
| D. | The couple acts on the wheel |
| Answer» E. | |
| 364. |
The resultant of two forces of equal magnitudes is also equal to the magnitude of the forces. The angle between the two forces is________________? |
| A. | 30° |
| B. | 60° |
| C. | 90° |
| D. | 120° |
| Answer» E. | |
| 365. |
Prefix deca represents_______________? |
| A. | 10 Raised to power 1 |
| B. | 10 Raised to power 2 |
| C. | 10 Raised to power 3 |
| D. | 10 Raised to power -1 |
| Answer» B. 10 Raised to power 2 | |
| 366. |
Three coplanar forces acting on a body keep it in equilibrium. They should therefore be_______________? |
| A. | Concurrent |
| B. | Non-concurrent |
| C. | Parallel |
| D. | Non-parallel |
| Answer» B. Non-concurrent | |
| 367. |
If the wavelength of incident radiation is increased in photoemission then_________________? |
| A. | The maximum kinetic energy of the photoelectrons increases |
| B. | The minimum kinetic energy of the photoelectrons decreases |
| C. | The minimum kinetic energy of the photoelectrons increases |
| D. | The average kinetic energy of the photoelectrons decreases |
| Answer» E. | |
| 368. |
Which of the following pairs does not have identical dimensions ? |
| A. | Torque and energy |
| B. | Momentum and impulse |
| C. | Energy and work |
| D. | Mass and moment of inertia |
| Answer» E. | |
| 369. |
If a photon is reflected from the mirror then the change in momentum of each photon is_______________? |
| A. | Zero |
| B. | Double |
| C. | Half |
| D. | 1 |
| Answer» C. Half | |
| 370. |
For confinement of electron in a box of radius 10-14m the electron, speed should be_____________? |
| A. | 107m/sec |
| B. | Should be greater than the speed of light. |
| C. | Be zero |
| D. | Not be wave-like |
| Answer» C. Be zero | |
| 371. |
A central force is that which__________________? |
| A. | Can produce torque |
| B. | Cannot produce torque |
| C. | Some time can produce torque some time cannot |
| D. | Has no relation with torque |
| Answer» C. Some time can produce torque some time cannot | |
| 372. |
The energy radiated is directly proportional to the fourth power of Kelvins temperature is________________? |
| A. | Karl-Weins law |
| B. | Rayleigh-Jeans law |
| C. | Stephens law |
| D. | Plancks |
| Answer» D. Plancks | |
| 373. |
In Davisson-Germer experiment the diffracted proton from crystal shows______________? |
| A. | Particle property |
| B. | Wave property |
| C. | Light property |
| D. | Quantum property |
| Answer» C. Light property | |
| 374. |
The cross product of two vectors is a negative vector when______________? |
| A. | They are parallel vectors |
| B. | They are anti parallel vectors |
| C. | They are a perpendicular vector |
| D. | They are rotated through 270° |
| Answer» E. | |
| 375. |
The velocity of a particle of mass m of de-Broglie wavelength λ is______________? |
| A. | v = 3 ×× 106 ms-1 |
| B. | v = 2 ×× 10 ms-1 |
| C. | v = 2 ×× 6 ms-1 |
| D. | v = 2 ×× 106 ms-1 |
| Answer» E. | |
| 376. |
If n number of the photon is striking on a metal surface then total momentum exerted is_______________? |
| A. | p |
| B. | n |
| C. | 0 |
| D. | None |
| Answer» B. n | |
| 377. |
A photon of wavelength 900nm behaves like a particle of mass______________? |
| A. | 5.53 x 10-36kg |
| B. | 0 kg. |
| C. | 2.46 x 10-36kg |
| D. | 1.84 x 10-44kg |
| Answer» D. 1.84 x 10-44kg | |
| 378. |
If a diffraction grating is placed in the path of a light beam it reveals______________? |
| A. | Wave property |
| B. | Particle property |
| C. | Energy particle |
| D. | Electromagnetic wave property |
| Answer» B. Particle property | |
| 379. |
Torque acting on a body determines_______________? |
| A. | Acceleration |
| B. | Linear acceleration |
| C. | Angular acceleration |
| D. | Direction of motion of the body |
| Answer» D. Direction of motion of the body | |
| 380. |
I ^. (j^ x k^) is equal to______________? |
| A. | 1 |
| B. | i^ |
| C. | j^ |
| D. | k^ |
| Answer» B. i^ | |
| 381. |
In an electron microscope, we use energetic particles because of______________? |
| A. | Penetrating power is high |
| B. | Kinetic energy is large |
| C. | Wavelength is very short |
| D. | All the above reasons |
| Answer» D. All the above reasons | |
| 382. |
In which quadrant, the only value of tan will be positive ? |
| A. | First |
| B. | Second |
| C. | Third |
| D. | Both 1st and 3rd |
| Answer» E. | |
| 383. |
As the temperature of black body is raised the wavelength corresponding to maximum intensity________________? |
| A. | shifts towards longer wavelength |
| B. | shifts towards shorter wavelength |
| C. | remain the same |
| D. | shifts towards longer as well as shorter wavelengths |
| Answer» C. remain the same | |
| 384. |
The magnitude of i^. (j^ x k^) is________________? |
| A. | 0 |
| B. | 1 |
| C. | -1 |
| D. | i^ |
| Answer» C. -1 | |
| 385. |
What is the angle that the given vector makes with y-axis and A=2i+3j ? |
| A. | 30° |
| B. | 60° |
| C. | 90° |
| D. | 120° |
| Answer» C. 90° | |
| 386. |
If A=Ax i^ + Ay j^ + Az K^ B = Bx i^ + By j^ + Bz K^ then______________? |
| A. | A. B = Ax Bx + Ay By + Az Bz |
| B. | A. B = Ax By + Ay Bz + Az By |
| C. | A. B = Ay Bz + Az By + Az Bx |
| D. | A. B = Ax Bz + Ay By + Az Bx |
| Answer» B. A. B = Ax By + Ay Bz + Az By | |
| 387. |
Two vectors A and B are making angle θ with each other. The scalar projection of vector B on vector A is written as____________? |
| A. | A.B/A |
| B. | A.B/B |
| C. | A.cosθ |
| D. | Both a and b are correct |
| Answer» B. A.B/B | |
| 388. |
In which quadrant the two rectangular components of a vector have same sign ? |
| A. | 1st |
| B. | 2nd |
| C. | Both 1st and 3rd |
| D. | 4th |
| Answer» D. 4th | |
| 389. |
Einstein’s photoelectric equation is given by_______________? |
| A. | 1/2 mvmax2=hf+Φ |
| B. | 1/2 mvmax2-hf = Φ |
| C. | 1/2 mvmax2=hf-Φ |
| D. | All of above are correct |
| Answer» D. All of above are correct | |
| 390. |
The name of the photon for quantum of light was proposed by________________? |
| A. | Ampere |
| B. | Plank |
| C. | Thomson |
| D. | Einstein |
| Answer» E. | |
| 391. |
Davison Germer experiment indicates__________________? |
| A. | Interference |
| B. | Polarization |
| C. | Electron diffraction |
| D. | Refraction |
| Answer» D. Refraction | |
| 392. |
In Compton scattering, the change in wavelength is maxed if_______________? |
| A. | The angle of scattering is 90° |
| B. | The angle of scattering is 60° |
| C. | The angle of scattering is 180° |
| D. | The angle of scattering is 0 |
| Answer» D. The angle of scattering is 0 | |
| 393. |
A photon is________________? |
| A. | A unit of energy |
| B. | A positively charged particle |
| C. | A quantum of electromagnetic radiation |
| D. | A unit of wavelength |
| Answer» D. A unit of wavelength | |
| 394. |
Which one of the following has the largest energy content ? |
| A. | 103 photons of wavelength 2 pm (γ-rays) |
| B. | 102 photons of wavelength 1nm (x-rays) |
| C. | 106 photons of wavelength 50?m (infrared) |
| D. | 106 photons of wavelength 200nm (UV) |
| Answer» B. 102 photons of wavelength 1nm (x-rays) | |
| 395. |
Beta particles ionize an atom_________________? |
| A. | Due to the electrostatic force of attraction |
| B. | Due to the electrostatic force of repulsion |
| C. | Due to a direct collision |
| D. | Due to the gravitational force |
| Answer» C. Due to a direct collision | |
| 396. |
The direction of the vector product is given by______________? |
| A. | Head to tail rule |
| B. | Right-hand rule |
| C. | Left-hand rule |
| D. | Triangular rule |
| Answer» C. Left-hand rule | |
| 397. |
Which one is not a type of dynamic equilibrium ? |
| A. | Rotational equilibrium |
| B. | Translational equilibrium |
| C. | Static equilibrium |
| D. | Both A and C are corret answer |
| Answer» D. Both A and C are corret answer | |
| 398. |
A body in equilibrium__________________? |
| A. | Always at rest |
| B. | Always in uniform motion |
| C. | May be at rest or in uniform motion |
| D. | May be at rest or in motion |
| Answer» D. May be at rest or in motion | |
| 399. |
Which one of the following radiation possesses maximum penetrating power ? |
| A. | X-rays |
| B. | B-rays |
| C. | γ-rays |
| D. | All have the equal penetrating power |
| Answer» D. All have the equal penetrating power | |
| 400. |
A body will be in complete equilibrium when it is satisfying______________? |
| A. | 1st condition of equilibrium |
| B. | 2nd condition of equilibrium |
| C. | Both Ist and 2nd condition of equilibrium |
| D. | Impossible |
| Answer» D. Impossible | |