McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Uncategorized topics .
Chapters
| 601. |
Resistivity of lead is {{}} |
| A. | 22.5 × 10 -8 Ω m |
| B. | 20.8 × 10 -8 Ω m |
| C. | 10 Ω m |
| D. | 5 Ω m |
| Answer» B. 20.8 × 10 -8 Ω m | |
| 602. |
A filament lamp is |
| A. | Ohmic |
| B. | non-Ohmic |
| C. | low resistive |
| D. | non glowing |
| Answer» B. non-Ohmic | |
| 603. |
In case of filament lamp at higher voltages, the resistance of lamp |
| A. | decreases |
| B. | increases |
| C. | remains constant |
| D. | varies depending on the filament |
| Answer» B. increases | |
| 604. |
If the connections across the resistor are reversed, then graph between current and potential difference is |
| A. | variable |
| B. | straight lined |
| C. | constant |
| D. | inverted |
| Answer» B. straight lined | |
| 605. |
In semiconductors upon increasing temperature, conductivity |
| A. | decreases |
| B. | increases |
| C. | remains constant |
| D. | haphazard |
| Answer» B. increases | |
| 606. |
In NTC thermistor on increasing temperature, the resistance |
| A. | increases |
| B. | remains constant |
| C. | decreases |
| D. | behaves abruptly |
| Answer» C. decreases | |
| 607. |
A component that allows unidirectional current to pass through it is |
| A. | resistor |
| B. | inductor |
| C. | transformer |
| D. | diode |
| Answer» D. diode | |
| 608. |
A rectifier converts |
| A. | DC to AC |
| B. | AC to DC |
| C. | voltage in to current |
| D. | current in to voltage |
| Answer» B. AC to DC | |
| 609. |
Threshold voltage at which LED emits light is |
| A. | less than 0.6 |
| B. | equal to 0.6 |
| C. | more than 0.6 |
| D. | more than 3 |
| Answer» C. more than 0.6 | |
| 610. |
Resistivity is measured in |
| A. | ohms |
| B. | ohm per meter |
| C. | ohm meter |
| D. | ohm sq. meter |
| Answer» C. ohm meter | |
| 611. |
Component which obeys ohm's law is called |
| A. | resistive component |
| B. | efficient component |
| C. | Ohmic component |
| D. | non-Ohmic component |
| Answer» C. Ohmic component | |
| 612. |
At constant temperature, resistance and cross-sectional area are |
| A. | directly related |
| B. | not related |
| C. | remains constant |
| D. | inversely related |
| Answer» D. inversely related | |
| 613. |
Current and voltage are |
| A. | directly related |
| B. | inversely related |
| C. | not related |
| D. | gives abnormal behavior on graph |
| Answer» A. directly related | |
| 614. |
At threshold voltage, resistance of diode |
| A. | decreases |
| B. | increases |
| C. | remains constant |
| D. | varies depending on the direction of voltage |
| Answer» A. decreases | |
| 615. |
Resistance of a particular wire depends upon |
| A. | size and shape |
| B. | shape and length only |
| C. | size only |
| D. | shape only |
| Answer» A. size and shape | |
| 616. |
Resistance of metal is affected by |
| A. | presence of impurities |
| B. | temperature |
| C. | both A and B |
| D. | pressure |
| Answer» C. both A and B | |
| 617. |
If current and potential difference are directly related then object follows |
| A. | Ohm's law |
| B. | Faraday's law |
| C. | Ampere's law |
| D. | Kirchhoff's law |
| Answer» A. Ohm's law | |
| 618. |
Effect of diffraction is greatest if waves pass through a gap with width equal to |
| A. | frequency |
| B. | wavelength |
| C. | amplitude |
| D. | wavefront |
| Answer» B. wavelength | |
| 619. |
Visible light has wavelength of |
| A. | 5 × 10-7 m |
| B. | 3 × 108 m |
| C. | 6 × 103 m |
| D. | 4 × 104 m |
| Answer» A. 5 × 10-7 m | |
| 620. |
From double-slit experiment, the quantities to be measured are |
| A. | slit separation |
| B. | fringe separation |
| C. | slit-to-screen distance |
| D. | all of above |
| Answer» D. all of above | |
| 621. |
For destructive interference, the path difference is |
| A. | odd number of half wavelengths |
| B. | even number of half wavelengths |
| C. | whole number of wavelengths |
| D. | even whole number of wavelengths |
| Answer» A. odd number of half wavelengths | |
| 622. |
Constructive interference happens when two waves are |
| A. | out of phase |
| B. | zero amplitude |
| C. | in phase |
| D. | in front |
| Answer» C. in phase | |
| 623. |
Two waves with phase difference 180° have resultant of amplitude |
| A. | one |
| B. | zero |
| C. | same as the single wave |
| D. | doubles the single wave |
| Answer» B. zero | |
| 624. |
If two waves are in phase and have same amplitude then resultant wave has |
| A. | half of amplitude of single wave |
| B. | same amplitude as single wave |
| C. | twice of amplitude of single wave |
| D. | thrice of amplitude of single wave |
| Answer» C. twice of amplitude of single wave | |
| 625. |
For listening radio in cars, external radio aerials are used because |
| A. | radio waves have shorter wavelength |
| B. | radio waves have longer wavelength |
| C. | radio waves cannot pass through window |
| D. | radio waves require a medium to propagate |
| Answer» B. radio waves have longer wavelength | |
| 626. |
When two waves meet, their displacements |
| A. | add up |
| B. | cancel out |
| C. | destruct each other |
| D. | subtract down |
| Answer» A. add up | |
| 627. |
Splitting of white light in to constituent colors is called |
| A. | diffraction |
| B. | refraction |
| C. | reflection |
| D. | dispersion |
| Answer» D. dispersion | |
| 628. |
Grating element is equal to |
| A. | nλ/sinθ |
| B. | nλ |
| C. | sinθ |
| D. | cosθ |
| Answer» A. nλ/sinθ | |
| 629. |
With diffraction grating, the angles are |
| A. | small |
| B. | greater |
| C. | zero |
| D. | close to zero |
| Answer» B. greater | |
| 630. |
Extra distance travelled by one of waves compared with other is called |
| A. | path |
| B. | displacement |
| C. | phase difference |
| D. | path difference |
| Answer» D. path difference | |
| 631. |
Spreading of wave as it passes through a gap or around an edge is called |
| A. | reflection |
| B. | refraction |
| C. | diffraction |
| D. | superposition |
| Answer» C. diffraction | |
| 632. |
Fringes are referred to as |
| A. | minima |
| B. | maxima |
| C. | nodes |
| D. | normal points |
| Answer» B. maxima | |
| 633. |
Principle of superposition can be applied to |
| A. | EM waves |
| B. | sound waves |
| C. | radio waves |
| D. | all of above |
| Answer» D. all of above | |
| 634. |
Coherent sources emit waves that have |
| A. | increasing phase difference |
| B. | decreasing phase difference |
| C. | constant phase difference |
| D. | varying phase difference |
| Answer» C. constant phase difference | |
| 635. |
Interference pattern of light and dark bands on screen is called |
| A. | graphical pattern |
| B. | line spectrum |
| C. | light spectrum |
| D. | fringes |
| Answer» D. fringes | |
| 636. |
Microwaves have wavelength of about |
| A. | 10 cm |
| B. | 20 cm |
| C. | 30 cm |
| D. | 40 cm |
| Answer» A. 10 cm | |
| 637. |
In young double slit experiment, the wavelength of incident beams should be |
| A. | same |
| B. | different |
| C. | zero |
| D. | opposite |
| Answer» A. same | |
| 638. |
Wavelength of an incident light when it is incident normally on a diffraction grating having 3000 lines per centimeter angular separation is 10° is |
| A. | 500 nm |
| B. | 650 nm |
| C. | 580 nm |
| D. | 600 nm |
| Answer» C. 580 nm | |
| 639. |
Supply of energy depends upon |
| A. | mass of material |
| B. | the change in temperature |
| C. | the material itself |
| D. | all of above |
| Answer» D. all of above | |
| 640. |
All substances have minimum internal energy at |
| A. | absolute zero |
| B. | 0°C |
| C. | 0°F |
| D. | 100K |
| Answer» A. absolute zero | |
| 641. |
Specific heat of aluminum when 26400 J of energy is supplied to 2 kg block and it's temperature rises from 20 °C to 35 °C is {{}} |
| A. | 1000 J kg-1 K-1 |
| B. | 70 J kg-1 K-1 |
| C. | 400 J kg1 K-1 |
| D. | 880 J kg -1 K-1 |
| Answer» D. 880 J kg -1 K-1 | |
| 642. |
On compression, the gat gets hotter due to |
| A. | increase in kinetic energy |
| B. | decrease in kinetic energy |
| C. | increase in potential energy |
| D. | increase in atomic collisions |
| Answer» A. increase in kinetic energy | |
| 643. |
If there is no transfer of energy between two objects then their temperature is |
| A. | same |
| B. | different |
| C. | zero |
| D. | infinite |
| Answer» A. same | |
| 644. |
Average kinetic energy of gas molecules is proportional to |
| A. | internal energy |
| B. | thermodynamic temperature |
| C. | enthalpy |
| D. | condensation point |
| Answer» B. thermodynamic temperature | |
| 645. |
Celsius scale is based on properties of |
| A. | Mercury |
| B. | Aluminum |
| C. | Cesium |
| D. | Water |
| Answer» D. Water | |
| 646. |
Energy required per unit mass of substance to raise temperature of that substance by 1 K is called |
| A. | enthalpy |
| B. | internal energy |
| C. | specific heat capacity |
| D. | temperature |
| Answer» C. specific heat capacity | |
| 647. |
Measure of average kinetic energy of molecules is |
| A. | temperature |
| B. | energy |
| C. | internal energy |
| D. | enthalpy |
| Answer» A. temperature | |
| 648. |
Energy of molecules of any substance is known as |
| A. | kinetic energy |
| B. | potential energy |
| C. | internal energy |
| D. | chemical energy |
| Answer» C. internal energy | |
| 649. |
Due to evaporation from certain surface, it's temperature |
| A. | falls |
| B. | increases |
| C. | doesn't change |
| D. | becomes zero |
| Answer» A. falls | |
| 650. |
Change of liquid in to gas without boiling is called |
| A. | vaporization |
| B. | sublimation |
| C. | boiling |
| D. | evaporation |
| Answer» D. evaporation | |
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