MCQOPTIONS
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MCQOPTIONS
This section includes 754 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 701. |
A sensitive galvanometer gives full-scale deflection with 100 mV. If the resistance of the galvanometer is 50? the maximum current that can flow through safely is__________________? |
| A. | 2.0 mA |
| B. | 20 mA |
| C. | 200 mA |
| D. | 0.2 mA |
| Answer» B. 20 mA | |
| 702. |
A satellite moving around the earth constitutes______________? |
| A. | An inertial frame of reference |
| B. | Non-inertial frame |
| C. | Neither inertial nor non-inertial |
| D. | Both inertial and non-inertial |
| Answer» C. Neither inertial nor non-inertial | |
| 703. |
A rubber cord of cross-sectional area 2cm2 has a length of 1m. When a tensile force of 10N is applied the length of the cord increases by 1cm. What is the youngs modulus of rubber ? |
| A. | 2×108 Nm-2 |
| B. | 5×106 Nm-2 |
| C. | 0.5×10-6 Nm-2 |
| D. | 0.2×10-6Nm-2 |
| Answer» C. 0.5×10-6 Nm-2 | |
| 704. |
A point where the incident parallel rays of light converge or appear to diverge after passing through a lens is called______________? |
| A. | center of curvature |
| B. | focus |
| C. | optical center |
| D. | aperture |
| Answer» C. optical center | |
| 705. |
A point source of light placed in a homogeneous medium gives rise to ___________________? |
| A. | a cylindrical wave front |
| B. | an elliptical wave front |
| C. | a spherical wave front |
| D. | a plane wave front |
| Answer» D. a plane wave front | |
| 706. |
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 | |
| 707. |
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 | |
| 708. |
A particle of mass m charge q and speed V enters a uniform magnetic radius r. The radius r of the circle is_________________? |
| A. | independent mass m |
| B. | directly proportional to m |
| C. | directly proportional to q |
| D. | directly proportional to B |
| Answer» E. | |
| 709. |
A particle having the mass of an electron and the charge of a proton is called a______________? |
| A. | Antiproton |
| B. | Positron |
| C. | Gamma rays |
| D. | Photon |
| Answer» C. Gamma rays | |
| 710. |
A moving coil galvanometer of resistance 100? gives half scale deflection for a current of 20mA. What will be the potential difference across it ? |
| A. | 4 volt |
| B. | 5 volt |
| C. | 2 volt |
| D. | 0.4 volt |
| Answer» D. 0.4 volt | |
| 711. |
A mass spectrograph (spectrometer) sorts out____________? |
| A. | Molecules |
| B. | Ions |
| C. | Elements |
| D. | Isotopes |
| Answer» D. Isotopes | |
| 712. |
A man standing near a fast moving train may fall___________? |
| A. | On the train |
| B. | Away from the train |
| C. | Towards the train |
| D. | On himself |
| Answer» D. On himself | |
| 713. |
A man of weight W is standing on an elevator which is ascending with an acceleration a. The apparent weight of the man is_______________? |
| A. | mg |
| B. | mg – ma |
| C. | mg + ma |
| D. | mg – ma |
| Answer» D. mg – ma | |
| 714. |
A man lifts vertically a weight of 40kg through 1m in 10s; while a chile lifts vertically a weight of 10kg through a distance of 1m in 1s. What will be correct inference ? |
| A. | man does more work than child |
| B. | child does more work than man |
| C. | both do the same amount of work |
| D. | it is a foolish question |
| Answer» C. both do the same amount of work | |
| 715. |
A man is in a car is moving with velocity of 36km/hr. His speed with repect to the car is ____________________? |
| A. | 10m/s |
| B. | 36m/s |
| C. | zero |
| D. | infinite |
| Answer» D. infinite | |
| 716. |
A magnetic field___________________? |
| A. | always exerts a force on a charged particle |
| B. | never exerts a force on a charged particles |
| C. | exerts a force if the charged particle is moving in the direction of the magnetic field lines |
| D. | exerts a force if the charged particle is moving perpendicular to the magnetic field lines |
| Answer» E. | |
| 717. |
A magnetic compass will be deflected if it is kept near a____________________? |
| A. | charge in motion |
| B. | charge at rest |
| C. | both |
| D. | none |
| Answer» B. charge at rest | |
| 718. |
A light ray traveling form rarer to denser medium suffers a phase change of__________________? |
| A. | 60° |
| B. | 90° |
| C. | 180° |
| D. | 45° |
| Answer» D. 45° | |
| 719. |
A lens which converges a beam of parallel rays to a point is called______________? |
| A. | diverging (or concave) lens |
| B. | converging (or convex) lens |
| C. | plano concave lens |
| D. | plano convex lens |
| Answer» C. plano concave lens | |
| 720. |
A hoop and disc have same mass and radius. Their rotational K.E are related by an equation______________? |
| A. | K.E hoop = K.E disc |
| B. | K.E hoop = 2K.E disc |
| C. | K.E hoop = 1/2K.E disc |
| D. | K.E hoop = 4K.E disc |
| Answer» C. K.E hoop = 1/2K.E disc | |
| 721. |
A galvanometer basically is an instrument used to ____________________? |
| A. | detect current in a circuit |
| B. | measure current flowing through a circuit |
| C. | measure voltage across a circuit |
| D. | measure potential difference between two points in a circuit |
| Answer» B. measure current flowing through a circuit | |
| 722. |
A fuse is placed in series with the circuit to protect against__________________? |
| A. | high power |
| B. | high voltage |
| C. | high current |
| D. | over heating |
| Answer» E. | |
| 723. |
A field in which the work done in a moving a body along closed path is zero is called________________? |
| A. | electric field |
| B. | conservative field |
| C. | electromagnetic field |
| D. | gravitational field |
| Answer» C. electromagnetic field | |
| 724. |
A ferromagnet will become fully magnetized at_________________? |
| A. | High voltage A.C |
| B. | Low voltage A.C |
| C. | Alternating current at its peak value |
| D. | D.C current at peak value |
| Answer» D. D.C current at peak value | |
| 725. |
A digit zero in a measurement__________________? |
| A. | May be significant may not significant |
| B. | Always significant |
| C. | Always insignificant sign |
| D. | Significant only if left to a significant figure |
| Answer» B. Always significant | |
| 726. |
A diffraction grating has 500 lines per mm. Its slit spacing or grating element will be equal to ____________________? |
| A. | 500 mm |
| B. | 5 x 10-3 mm |
| C. | 2 x 10-5 mm |
| D. | 2 x 10-3 mm |
| Answer» E. | |
| 727. |
A device for producing high-velocity nuclei is ________________? |
| A. | Cloud chamber |
| B. | Linear accelerator |
| C. | A mass spectrograph |
| D. | Wilson cloud chamber |
| Answer» C. A mass spectrograph | |
| 728. |
A cyclist cycling around a circular racing track skids because_____________? |
| A. | the centripetal force upon him is less than limiting friction |
| B. | the centripetal force upon him is greater than limiting friction |
| C. | the centripetal force upon him is equal to the limiting friction |
| D. | the friction between the tyres of the cycle and road vanishes |
| Answer» C. the centripetal force upon him is equal to the limiting friction | |
| 729. |
A current carrying conductor is placed in a uniform magnetic field parallel to it. The magnetic force experienced by the conductor is _____________________? |
| A. | F=1/B |
| B. | F=1/Bsinθ |
| C. | F/0 |
| D. | F=1/Bcosθ |
| Answer» D. F=1/Bcosθ | |
| 730. |
A cup of milk is placed in a microwave oven. Tell which statements is false. (1) Milk will be heated up only. (2) Cup will remain cool. (3) Both cup and mild will get hot ? |
| A. | None |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» E. | |
| 731. |
A convex lens of focal length f1 and a concave lens of focal length f2 are placed in contact. The focal length of the combination is_____________? |
| A. | f2 + f1 |
| B. | f2 – f1 |
| C. | f1f2/f2+f1 |
| D. | f1f2/f1-f2 |
| Answer» E. | |
| 732. |
A convex lens gives a virtual image only when the objects lies_________________? |
| A. | between principal focus and center of curvature |
| B. | beyond 2 f |
| C. | at the principal focus |
| D. | between principal focus and optical center |
| Answer» E. | |
| 733. |
A convex lens acts as a diverging lens if the_________________? |
| A. | object is beyond C |
| B. | if the object is with in C |
| C. | if the object is within f |
| D. | both B and C |
| Answer» E. | |
| 734. |
A completely filled band is called__________________? |
| A. | Conduction band |
| B. | Valence band |
| C. | Forbidden band |
| D. | Core band |
| Answer» E. | |
| 735. |
A chimney works best if air exposed to the chimney is______________? |
| A. | Stationary |
| B. | Moving |
| C. | Moving slowly |
| D. | Moving fast |
| Answer» E. | |
| 736. |
A choke is used as a resistance in_________________? |
| A. | DC circuit |
| B. | AC circuits |
| C. | Both AC and DC circuit |
| D. | Full wave rectifier circuit |
| Answer» C. Both AC and DC circuit | |
| 737. |
A changing magnetic flux produces around itself an induced_______________? |
| A. | Magnetic field |
| B. | Electric field |
| C. | Electromagnetic force |
| D. | Artificial gravitational field |
| Answer» D. Artificial gravitational field | |
| 738. |
A certain stress applied to an elastic material produces a certain strain in it. If the elastic limit is not exceeded the energy gained per unit volume of the material is given by_________________? |
| A. | Stress/strain |
| B. | (stress/strain) |
| C. | Stress x strain |
| D. | (Stress / strain) |
| Answer» E. | |
| 739. |
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 | |
| 740. |
A capacitor of capacitance 30µF is charged by a constant current of 10mA. If initially, the capacitor was uncharged what is the time taken for the potential difference across the capacitor to reach 300V ? |
| A. | 0.9sec |
| B. | 15 sec |
| C. | 1.5x105sec |
| D. | 0.9x102sec |
| Answer» B. 15 sec | |
| 741. |
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 | |
| 742. |
A body of 2 kg is suspended from the ceiling of an elevator moving up with an acceleration g. Its apparent weight in the elevator will be______________? |
| A. | 9.8 N |
| B. | 19.6 N |
| C. | 129.4 N |
| D. | 39.2 N |
| Answer» E. | |
| 743. |
A body moving along the circumference of a circle completes two revolutions. If the radius of the circular path is R the ration of displacement to the covered path will be_____________? |
| A. | πR |
| B. | 2π R |
| C. | 0 |
| D. | 4πR |
| Answer» D. 4πR | |
| 744. |
A body is moving with uniform velocity. Its______________________? |
| A. | speed changes |
| B. | acceleration changes |
| C. | direction of motion changes |
| D. | displacement from origin changes |
| Answer» E. | |
| 745. |
A body is falling freely under gravity. How much distance it falls during an interval of time between 1st and 2nd seconds of its motion, taking g=10 ? |
| A. | 14 m |
| B. | 20 m |
| C. | 5 m |
| D. | 25 m |
| Answer» B. 20 m | |
| 746. |
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 | |
| 747. |
A body can have constant velocity when it follows a_____________? |
| A. | Elliptical path |
| B. | Circular path |
| C. | Parabolic path |
| D. | Rectilinear path |
| Answer» E. | |
| 748. |
A 100µF capacitor with a 12V source in series having frequency 50Hz will offer a capacitive reactance of about______________? |
| A. | 32Ω |
| B. | 62Ω |
| C. | 50Ω |
| D. | 100Ω |
| Answer» B. 62Ω | |
| 749. |
A 10Ω electric heater is connected to a 220V 50Hz mains supply. What is the peak value of the potential difference across the heater element ? |
| A. | 220V |
| B. | 220/ 2V |
| C. | 110V |
| D. | 220 √2V |
| Answer» E. | |
| 750. |
3rd law of motion explains______________________? |
| A. | effect of force |
| B. | existence of a force |
| C. | existence of two forces |
| D. | existence of pair of forces in nature |
| Answer» E. | |