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.
| 651. |
An immersion heater of 400 watts kept on for 5 hours will consume electrical power of __________________? |
| A. | 2KWh |
| B. | 20KWh |
| C. | 6KWh |
| D. | 12KWh |
| Answer» B. 20KWh | |
| 652. |
An ideal standard of measurement of a base quantity has characteristics_______________? |
| A. | Accessible |
| B. | Invariable |
| C. | Transportable |
| D. | Only a and b are correct |
| Answer» E. | |
| 653. |
An elevator weighing 3.5 x 10-6 N is raised to a height of 1000 m in the absence of friction, the work done is_________________? |
| A. | 3.5 x 103 J |
| B. | 3.5 x 104 J |
| C. | 3.5 x 106 J |
| D. | 3.5 x 109 J |
| Answer» E. | |
| 654. |
An electron enters a region where the electric field E is perpendicular to the magnetic field B. It will suffer no deflection if_________________? |
| A. | E = BeV |
| B. | B = eE/V |
| C. | E = BV |
| D. | E = BeV/2 |
| Answer» D. E = BeV/2 | |
| 655. |
An electromagnetic wave consists of _____________________? |
| A. | Electric and magnetic fields moving parallel to each other |
| B. | Magnetic field moving with velocity of light in space |
| C. | Electric field moving with velocity of light |
| D. | Electric and magnetic fields moving perpendicular to each other |
| Answer» E. | |
| 656. |
An electric iron is marked 20 volts 500W. The units consumed by it in using if for 24 hours will be______________? |
| A. | 12 |
| B. | 24 |
| C. | 5 |
| D. | 1100 |
| Answer» B. 24 | |
| 657. |
An angle between two vectors A and B can be determined by_____________? |
| A. | Their dot product |
| B. | Their cross product |
| C. | Head to tail rule |
| D. | Right-hand rule |
| Answer» B. Their cross product | |
| 658. |
An ammeter measures the total current flowing through a circuit when it is connected__________________? |
| A. | in series with the circuit |
| B. | in parallel with circuit |
| C. | in series with any of the parallel resistances in the circuit |
| D. | in parallel with any of the series resistances in the circuit |
| Answer» B. in parallel with circuit | |
| 659. |
An alternating current or voltage_____________________? |
| A. | fluctuates off and on |
| B. | varies in magnitude alone |
| C. | changes its direction again and again |
| D. | changes its magnitude harmonically and reverses its direction of flow after regularly recurring intervals |
| Answer» D. changes its magnitude harmonically and reverses its direction of flow after regularly recurring intervals | |
| 660. |
An alternating current of the r.m.s value of 4.0 A and frequency 50Hz flows in a circuit containing a 10Ω resistor. The peak current is then ? |
| A. | 20A |
| B. | 20.66A |
| C. | 6.66A |
| D. | 5.66A |
| Answer» E. | |
| 661. |
An alternating current is represented by the equation I = I∫sinπt which of the following equation represents an alternating current of frequency and amplitude twice that of the above current ? |
| A. | I = 2I∫Sin(πt/2) |
| B. | I = 2I∫Sin(2πt) |
| C. | I = 2ISinπt |
| D. | I = I∫sin(2πt) |
| Answer» C. I = 2ISinπt | |
| 662. |
An alpha particle is emitted from 88Ra226. What is the mass and atomic number of the daughter nucleus ? |
| A. | 224 – 84 |
| B. | 220 – 80 |
| C. | 222 – 86 |
| D. | 226 – 87 |
| Answer» D. 226 – 87 | |
| 663. |
An alpha particle in a single encounter__________________? |
| A. | Loses a small fraction of its energy |
| B. | Losses most of its energy |
| C. | Loses no energy at all |
| D. | Loses all of its energy |
| Answer» C. Loses no energy at all | |
| 664. |
An alpha particle can produce fluorescence in__________________? |
| A. | ZnS |
| B. | Barium platinocyanide |
| C. | Calcium tungstate |
| D. | All of above |
| Answer» E. | |
| 665. |
An A.C series circuit containing 4Ω resistance and 3Ω inductive reactance. The impedance of the circuit is______________? |
| A. | 1Ω |
| B. | 5Ω |
| C. | 7Ω |
| D. | 7Ω |
| Answer» C. 7Ω | |
| 666. |
Ammeter connected in an AC circuit measures______________? |
| A. | The exact value of the current |
| B. | RMS value of the current |
| C. | The net value of the current |
| D. | The peak value of the current |
| Answer» C. The net value of the current | |
| 667. |
Alpha particles possess greater penetration power than that of beta particles due to its_____________? |
| A. | Smaller ionization power |
| B. | Greater ionization power |
| C. | Neither greater nor smaller ionization power |
| D. | Same ionization power |
| Answer» B. Greater ionization power | |
| 668. |
Alpha particle ionizes an atom_________________? |
| A. | Through direct collision |
| B. | Through electrostatic attraction |
| C. | Through electrostatic repulsion |
| D. | All of above |
| Answer» D. All of above | |
| 669. |
All electrical appliances are connected in parallel to each other between the main line and neutral wire to get ______________________? |
| A. | same current |
| B. | same current and potential difference |
| C. | different current but same potential difference |
| D. | different current and potential differences |
| Answer» D. different current and potential differences | |
| 670. |
After traveling through a vacuum a photon of light entering into some transparent denser medium. Thus the energy of light______________? |
| A. | Increases because wavelength decreases |
| B. | Decreases because speed decreases |
| C. | Remains same |
| D. | Increases then decrease |
| Answer» D. Increases then decrease | |
| 671. |
Adiabatic process is also called______________? |
| A. | Heat exchange process |
| B. | Heating process |
| C. | Isentropic process |
| D. | All of the above |
| Answer» D. All of the above | |
| 672. |
Addition of vector obeys_____________? |
| A. | Commutative law |
| B. | Distributive law |
| C. | Associative law |
| D. | All given laws in A, B and C |
| Answer» E. | |
| 673. |
According to which one of following law the density of atom is uniform ? |
| A. | J.J.Thomson model |
| B. | Rutherfords model |
| C. | Bohrs model |
| D. | All of the above laws contradict the statement |
| Answer» B. Rutherfords model | |
| 674. |
According to Pascals law the pressure of gas in a vessel is_____________? |
| A. | Different in different direction |
| B. | Same in all direction |
| C. | Same only along opposite directions |
| D. | Same only along normal directions |
| Answer» C. Same only along opposite directions | |
| 675. |
According to Newton sound travel in air under the conditions of_____________________? |
| A. | adiabatic |
| B. | isothermal |
| C. | isobaric |
| D. | isochoric |
| Answer» D. isochoric | |
| 676. |
According to equation of continuity A1V1 = A2V2 = constant. The constant is equal to_______________? |
| A. | Flow rate |
| B. | Volume of fluid |
| C. | Mass of fluid |
| D. | The density of the fluid |
| Answer» B. Volume of fluid | |
| 677. |
According to Einstein light travels form one place to another in the form of ________________? |
| A. | waves |
| B. | particles |
| C. | photons |
| D. | it was not his discovery |
| Answer» D. it was not his discovery | |
| 678. |
According to Einstein, the gravitational interaction is possible between_______________? |
| A. | material objects only |
| B. | material objects and electromagnetic radiation only |
| C. | electromagnetic radiations |
| D. | none of the above |
| Answer» C. electromagnetic radiations | |
| 679. |
Acceptor and donor impurities donate______________? |
| A. | n-carriers only |
| B. | p-carriers only |
| C. | p-carriers and n-carriers respectively |
| D. | n-carriers and p-carriers respectively |
| Answer» D. n-carriers and p-carriers respectively | |
| 680. |
Absolute uncertainty in a measurement depends upon______________? |
| A. | The magnitude of the measurement |
| B. | Least count of the instrument |
| C. | Percentage error in the measurement |
| D. | All of a, b and C |
| Answer» C. Percentage error in the measurement | |
| 681. |
A wire suspended vertically from one end is stretched by attaching a weight of 20N to the lower end. The weight stretches the wire by 1mm. How much energy is gained by the wire ? |
| A. | 0.01J |
| B. | 0.02J |
| C. | 0.04J |
| D. | 1.0J |
| Answer» B. 0.02J | |
| 682. |
A wire of uniform area of cross-section A length L and resistance R is cut into two parts. Resistivity of each part _________________? |
| A. | remains the same |
| B. | is doubled |
| C. | is halved |
| D. | becomes zero |
| Answer» B. is doubled | |
| 683. |
A wire of resistance R is coiled inductively so that its inductance is L. The impedance of the coil at a frequency of f is_______________? |
| A. | (R+2πfL) |
| B. | R+1/2πfL |
| C. | (R2+f2L2) |
| D. | (R2+4π2f2L2) |
| Answer» E. | |
| 684. |
A wire of length L is stretched by a length E when a force F is applied at one end. If the elastic limit is not exceeded the amount of energy stored in the wire is_________________? |
| A. | FE |
| B. | (FE) |
| C. | FE2/L |
| D. | FE2 |
| Answer» C. FE2/L | |
| 685. |
A wire obeys Hooks law is of length 11 when it is in equilibrium under a tension F1. Its length becomes 12 when the tension is increased to F2. The energy stored in the wire during this process is____________________? |
| A. | (F1+F2) (121+122) |
| B. | (F1+F2) (122-112) |
| C. | (F1+F2) (12-11) |
| D. | (F1+F2) (12-11) |
| Answer» D. (F1+F2) (12-11) | |
| 686. |
A wire is stretched by a force F which causes an extension 1. The energy stored in the wire is____________________? |
| A. | The extension of the wire is proportional to the force applied |
| B. | The weight of the wire is negligible |
| C. | The wire is not stretched beyond its elastic limit |
| D. | The cross sectional area of the wire remains constant |
| Answer» B. The weight of the wire is negligible | |
| 687. |
A wire having very high value of conductance is said to be____________________? |
| A. | very good conductor |
| B. | moderately good conductor |
| C. | an insulator |
| D. | no specific criterion available |
| Answer» B. moderately good conductor | |
| 688. |
A wheat stone bridge is said to be balanced when____________________? |
| A. | maximum current flows through the galvanometer branch |
| B. | minimum current flows through the galvanometer branch |
| C. | potential difference across galvanometer branch is maximum |
| D. | potential difference across galvanometer branch is zero |
| Answer» E. | |
| 689. |
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 | |
| 690. |
A vector can be multiplied by a number. The number may be_______________? |
| A. | Dimensionless |
| B. | Dimensional scalar |
| C. | Negative |
| D. | All A, B and C are correct |
| Answer» E. | |
| 691. |
A vacant or partially filled band is called _____________________? |
| A. | Conduction band |
| B. | Valence band |
| C. | Forbidden band |
| D. | Empty band |
| Answer» B. Valence band | |
| 692. |
A uniform steel wire of length 4m and area of cross-section 3×10-6m2 is extended by 1mm by the application of a force. If the youngs modulus of steel is 2×1011 Nm-2 the energy stored in the wire is___________________? |
| A. | 0.025J |
| B. | 0.50J |
| C. | 0.75J |
| D. | 0.100J |
| Answer» D. 0.100J | |
| 693. |
A transmitting station emits radio waves of wavelength λ at power P. If h is Planck’s constant & c the speed of light what is the rate of emission of photons ? |
| A. | λ |
| B. | Speed of sound |
| C. | Speed of lightB. |
| D. | h |
| Answer» D. h | |
| 694. |
A three-dimensional image is obtained by________________? |
| A. | Electron microscope |
| B. | Scanning electron microscope |
| C. | Magnetic imaging |
| D. | None of the above |
| Answer» C. Magnetic imaging | |
| 695. |
A thing that emits its own light is___________________? |
| A. | luminous |
| B. | non-luminous |
| C. | incandescent |
| D. | bright |
| Answer» B. non-luminous | |
| 696. |
A stone is whirled in a vertical circle at the end of a string. When the stone is at the highest position the tension in the string is______________? |
| A. | Maximum |
| B. | Zero |
| C. | Equal to the weight of the stone |
| D. | Less than the weight of the stone |
| Answer» D. Less than the weight of the stone | |
| 697. |
A stone is thrown upward from the top of a 59.4m high cliff with an upward velocity component of 19.6m/s how long is the stone in the air? |
| A. | 4.00 s |
| B. | 5.00 s |
| C. | 6.00 s |
| D. | 7.00 s |
| Answer» D. 7.00 s | |
| 698. |
A stationary wave is set up in the air column of a closed pipe. At the closes end of the pipe _____________________? |
| A. | always an node in formed |
| B. | always an antinode is formed |
| C. | neither node nor antinode is formed |
| D. | sometimes a node and sometimes an antinode is formed |
| Answer» B. always an antinode is formed | |
| 699. |
A simple pendulum suspended from the ceiling of a lift has time period T when the lift is at rest. When the lift falls freely, the time period is_________________? |
| A. | Infinite |
| B. | T/g |
| C. | Zero |
| D. | g/T |
| Answer» B. T/g | |
| 700. |
A simple pendulum has a bob of mass m and its frequency is f. If we replaced the bob with a heavier one say of 2m then that will be its new frequency ? |
| A. | 1/4f |
| B. | 1/2f |
| C. | frequency lower than 20 Hz |
| D. | 2f |
| Answer» D. 2f | |