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.
| 651. |
For normal adjustment, length of astronomical telescope is______________? |
| A. | fo + fe |
| B. | fo – fe |
| C. | fo / fe |
| D. | fe / fo |
| Answer» B. fo – fe | |
| 652. |
Two convex lenses of equal focal length f are placed in contact the resultant focal length of the combination is______________? |
| A. | zero |
| B. | focus |
| C. | 2 f |
| D. | f/2 |
| Answer» E. | |
| 653. |
Image of an object 5 mm high is only 1 cm high. Magnification produced by lens is__________________? |
| A. | 0.5 |
| B. | 0.2 |
| C. | 1 |
| D. | 2 |
| Answer» E. | |
| 654. |
Least distance of distinct vision_____________? |
| A. | increases with increase in age |
| B. | decreases with increase in age |
| C. | neither increases nor decreases |
| D. | becomes infinite after 60 years |
| Answer» B. decreases with increase in age | |
| 655. |
An inductive coil has a resistance of 100Ω. When an AC signal of frequency 1000Hz is fed to the coil the applied voltage leads the current by 45Ω. What is the inductance of the coil ? |
| A. | 10mH |
| B. | 12mH |
| C. | 16mH |
| D. | 20mH |
| Answer» D. 20mH | |
| 656. |
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 | |
| 657. |
In optic fiber transmission the repeater are separated through a distance of __________ km in newer system? |
| A. | 300km |
| B. | 200km |
| C. | 100km |
| D. | 20km |
| Answer» D. 20km | |
| 658. |
The function of collimeter in spectrometer is________________? |
| A. | to produce parallel beams of light |
| B. | to filter the light rays |
| C. | to make them |
| D. | no function |
| Answer» B. to filter the light rays | |
| 659. |
Hydrogen atom does not emit X-rays because _________________? |
| A. | its energy levels are too close to each other |
| B. | its energy levels are too far apart |
| C. | it is too small in size |
| D. | it has a single electron |
| Answer» E. | |
| 660. |
Total number of series in hydrogen spectrum is_____________? |
| A. | three |
| B. | four |
| C. | five |
| D. | six |
| Answer» D. six | |
| 661. |
X-ray are________________? |
| A. | of unknown nature |
| B. | high energy electrons |
| C. | high energy photons |
| D. | radio isotopes |
| Answer» D. radio isotopes | |
| 662. |
The relation between the escape velocity V esc and orbital speed Vo is given by________________? |
| A. | V esc = 1/2Vo |
| B. | V esc = -2 Vo |
| C. | V esc = Vo |
| D. | V esc = 2Vo |
| Answer» C. V esc = Vo | |
| 663. |
The direction of propagation of an electromagnetic waves is________________? |
| A. | Perpendicular to electric field |
| B. | Perpendicular to both electric and magnetic field |
| C. | Perpendicular to magnetic field |
| D. | Parallel to electric and magnetic field |
| Answer» C. Perpendicular to magnetic field | |
| 664. |
Electromagnetic waves transport___________________? |
| A. | Energy |
| B. | Momentum |
| C. | Mass |
| D. | Heat |
| Answer» B. Momentum | |
| 665. |
The penetrating power of X-rays depends on their______________? |
| A. | applied voltage |
| B. | frequency |
| C. | source |
| D. | all of the above |
| Answer» C. source | |
| 666. |
Reverse process of photoelectric effect is_______________? |
| A. | pair production |
| B. | Compton effect |
| C. | annihilation of matter |
| D. | X-rays production |
| Answer» E. | |
| 667. |
Heating a magnet will ____________________? |
| A. | weaken it |
| B. | strengthen it |
| C. | reverse its polarity |
| D. | demagnetize it completely |
| Answer» B. strengthen it | |
| 668. |
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 | |
| 669. |
The characteristic X-rays spectrum is due to_____________? |
| A. | The illumination of the target metal by ultra-violet radiation |
| B. | The bombardment of the target by protons |
| C. | The bombardment of target by electrons |
| D. | The absorption of radiation by the target metal |
| Answer» D. The absorption of radiation by the target metal | |
| 670. |
Value of permeability of free space in SI units is___________________? |
| A. | 4πx10-9 WbA-1m-1 |
| B. | 4πx10-7 WbA-1m-1 |
| C. | 4πx10-10 WbA-1m-1 |
| D. | 4πx10-8 WbA-1m-1 |
| Answer» C. 4πx10-10 WbA-1m-1 | |
| 671. |
The magnetic field strength of solenoid is__________________? |
| A. | B = μNI |
| B. | B = μN/I |
| C. | B = μnI |
| D. | Both B and C |
| Answer» E. | |
| 672. |
The charged particle enters the uniform magnetic field in such a way that its initial velocity is not perpendicular to the field the orbit will be__________________? |
| A. | a circle |
| B. | a spiral |
| C. | an ellipse |
| D. | helix |
| Answer» E. | |
| 673. |
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 | |
| 674. |
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. | |
| 675. |
Reflecting mirrors in laser is used to______________? |
| A. | Further stimulation |
| B. | Lasing more |
| C. | For producing more energetic lasers |
| D. | All |
| Answer» B. Lasing more | |
| 676. |
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 | |
| 677. |
In the transistor schematic symbol, the arrow_______________? |
| A. | is located on the emitter |
| B. | is located on the base |
| C. | is locate on the collector |
| D. | points form north to south |
| Answer» B. is located on the base | |
| 678. |
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. | |
| 679. |
Which one of the following material is most suitable for making core of an electromagnet ? |
| A. | air |
| B. | steel |
| C. | Cu-Ni alloy |
| D. | soft iron |
| Answer» E. | |
| 680. |
The relationship between Tesla and smaller unit Gauss of magnetic induction is given by_________________? |
| A. | 1T = 103 G |
| B. | 1T = 10-4 G |
| C. | 1T = 10-2 G |
| D. | 1T = 104 G |
| Answer» E. | |
| 681. |
SI unit of flux density is____________________? |
| A. | NA-1m-1 |
| B. | NAm-1 |
| C. | NmA-1 |
| D. | NmA-2 |
| Answer» B. NAm-1 | |
| 682. |
Which one of following band is completely filled in case of conductors ? |
| A. | Conduction band |
| B. | Fermi band |
| C. | Valence band |
| D. | Forbidden band |
| Answer» B. Fermi band | |
| 683. |
To obtain an n-type semiconductor germanium crystal it must be doped with foreign atoms whose valency is_____________? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» E. | |
| 684. |
Forward current through a semi conductor diode circuit is due to____________? |
| A. | minority carriers |
| B. | majority carriers |
| C. | holes |
| D. | electron |
| Answer» C. holes | |
| 685. |
The operation of a transistor requires______________? |
| A. | That the emitter be heated |
| B. | That the base be heated |
| C. | That the collector be heated |
| D. | None of the above |
| Answer» E. | |
| 686. |
The electrons in conduction band are free to___________________? |
| A. | Transport vibrations |
| B. | Transport signals |
| C. | Transport charge |
| D. | Transport impulses |
| Answer» D. Transport impulses | |
| 687. |
The electronic circuits which implement the various logic operations are called_____________? |
| A. | Logic gates |
| B. | Boolean algebra |
| C. | Amplifier gain |
| D. | Logic functions |
| Answer» B. Boolean algebra | |
| 688. |
Materials that undergo plastic deformation before breaking are called __________________? |
| A. | Brittle |
| B. | Ductile |
| C. | Amorphous |
| D. | Polymers |
| Answer» C. Amorphous | |
| 689. |
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 | |
| 690. |
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 | |
| 691. |
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 | |
| 692. |
The rectangular voltage is an example of____________________? |
| A. | An analogue waveform |
| B. | Continuous wave form |
| C. | Electronic waveform |
| D. | A digital waveform |
| Answer» E. | |
| 693. |
Which of the following substances posses the highest elasticity ? |
| A. | Rubber |
| B. | Steel |
| C. | Glass |
| D. | Copper |
| Answer» C. Glass | |
| 694. |
An OP-AMPs can amplify_______________? |
| A. | D.C. |
| B. | A.C. |
| C. | Both A.C. & D.C. |
| D. | None of the above |
| Answer» C. Both A.C. & D.C. | |
| 695. |
The angular position of cells remains the same for a sample of a crystal. This property is called___________________? |
| A. | Isotropy |
| B. | Cleavage |
| C. | Homogeneity |
| D. | The external symmetry of form |
| Answer» E. | |
| 696. |
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 | |
| 697. |
Which one of the following physical quantities does not have the dimensions of force per unit area ? |
| A. | Stress |
| B. | Strain |
| C. | Youngs modulus |
| D. | Pressure |
| Answer» C. Youngs modulus | |
| 698. |
If the density of atoms remain same along any direction in a crystal is called__________________? |
| A. | Symmetry |
| B. | Homogeneity |
| C. | Isotropy |
| D. | Cleavage |
| Answer» C. Isotropy | |
| 699. |
What are the dimensions of stress ? |
| A. | MLT-2 |
| B. | ML-2T-1 |
| C. | ML-1T-2 |
| D. | ML-T-1 |
| Answer» D. ML-T-1 | |
| 700. |
When a force is applied at one end of an elastic wire it produces at strain ∝ in the wire. If y is the youngs modulus of the material of the wire the amount of energy stored per unit volume of the wire is given by_________________? |
| A. | Y∝ |
| B. | 2Y∝ |
| C. | Y∝/2 |
| D. | Y∝2 |
| Answer» E. | |