MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Railway tracks are banked on curves so that |
| A. | ecessary centrifugal force may be obtained from the horizontal component of the weight of the train |
| B. | o frictional force may be produced between the tracks and the wheels of the train |
| C. | ecessary centripetal force may be obtained from the horizontal component of the weight of the train |
| D. | he train may not fall down inwards |
| Answer» D. he train may not fall down inwards | |
| 2. |
In severe winter, in cold countries water pipes burst because |
| A. | ater expands on freezing |
| B. | ontraction of water pipes |
| C. | igh atmospheric pressure |
| D. | ombined effect of all the above three |
| Answer» B. ontraction of water pipes | |
| 3. |
Pipelines in cold countries often burst in winter, because |
| A. | ater freezes and expands in its volume |
| B. | emperature of ice is less than that of water |
| C. | ipelines contract in their volume |
| D. | ipelines expand due to freezing |
| Answer» B. emperature of ice is less than that of water | |
| 4. |
A small gap is left at the joints of rails in a railway track to |
| A. | void the tracks being distorted due to seasonal temperature variation |
| B. | void the heating of tracks to high temperature |
| C. | ontrol the speed of train |
| D. | eep the rails equidistant |
| Answer» B. void the heating of tracks to high temperature | |
| 5. |
Among the following materials sound travels fastest in |
| A. | teel |
| B. | ir |
| C. | acuum |
| D. | ater |
| Answer» B. ir | |
| 6. |
Instrument used to study the behaviour of a vibrating string is : |
| A. | arometer |
| B. | ydrometer |
| C. | ygrometer |
| D. | onometer |
| Answer» E. | |
| 7. |
Man perceives sound vibrations in the frequency ranges of |
| A. | – 5 Hz |
| B. | – 10 Hz |
| C. | 1 – 20 Hz |
| D. | 0 – 20000 Hz |
| Answer» E. | |
| 8. |
Noise is measured in |
| A. | att |
| B. | EM |
| C. | entigrade |
| D. | ecibel |
| Answer» E. | |
| 9. |
Sound cannot pass through |
| A. | ater |
| B. | teel |
| C. | ir |
| D. | acuum |
| Answer» E. | |
| 10. |
In SONAR which kind of wave is used? |
| A. | nfrasonic |
| B. | ltrasonic |
| C. | adio |
| D. | udible sound |
| Answer» C. adio | |
| 11. |
The ordinary and maximum tolerance limit of sound by human being is |
| A. | 0 db to 70 db (decibel) |
| B. | 0 db to 80 db (decibel) |
| C. | 5 db to 75 db (decibel) |
| D. | 0 db to 85 db (decibel) |
| Answer» C. 5 db to 75 db (decibel) | |
| 12. |
Hertz is a unit for measuring |
| A. | ntensity of waves |
| B. | requency of waves |
| C. | avelength |
| D. | larity of waves |
| Answer» C. avelength | |
| 13. |
Least audible sound for most of the human ear is : |
| A. | 0.0 µ bar |
| B. | .0002 µ bar |
| C. | .005 µ bar |
| D. | .0 µ bar |
| Answer» C. .005 µ bar | |
| 14. |
The unit of noise pollution (level) is : |
| A. | ecibel |
| B. | ecimal |
| C. | pm |
| D. | one of these |
| Answer» B. ecimal | |
| 15. |
Decibel is a term connected with : |
| A. | ir |
| B. | ater |
| C. | ound |
| D. | oil |
| Answer» D. oil | |
| 16. |
A decibel is |
| A. | musical instrument |
| B. | he wavelength of noise |
| C. | musical note |
| D. | measure of sound level |
| Answer» E. | |
| 17. |
What apparatus is used to locate a submerged object? |
| A. | adar |
| B. | onar |
| C. | uasar |
| D. | ulsar |
| Answer» C. uasar | |
| 18. |
The pitch of sound depends on its |
| A. | requency |
| B. | ntensity |
| C. | elocity |
| D. | mplitude |
| Answer» B. ntensity | |
| 19. |
Speed of sound is the greatest in : |
| A. | ater |
| B. | ir |
| C. | lass |
| D. | lycerine |
| Answer» D. lycerine | |
| 20. |
The number of waves per second in a sound is called ________ of that sound. |
| A. | elocity |
| B. | requency |
| C. | isplacement |
| D. | cceleration |
| Answer» C. isplacement | |
| 21. |
Ohm's law is valid in case of |
| A. | emiconductor |
| B. | onductor |
| C. | uperconductor |
| D. | nsulator |
| Answer» C. uperconductor | |
| 22. |
If the current flowing through a circuit is 0.6 A for 6 mins, the amount of electric charge flowing through it is ________ |
| A. | 60C |
| B. | 16 C |
| C. | 0 C |
| D. | 6 C |
| Answer» C. 0 C | |
| 23. |
The fundamental scientific principle in the operation of battery is |
| A. | cid-base interaction |
| B. | ialysis |
| C. | issociation of electrolytes |
| D. | xidation-reduction |
| Answer» D. xidation-reduction | |
| 24. |
A device which is used to limit the current in an electrical circuit is called a |
| A. | rid |
| B. | use |
| C. | ub |
| D. | onductor |
| Answer» C. ub | |
| 25. |
A bimetal made copper and iron strips welded together is straight at room temperature. It is held vertically with iron strip towards left and copper strip towards right. If this bimetal is heated, it will |
| A. | emain straight |
| B. | end towards right |
| C. | end towards left |
| D. | one of these |
| Answer» D. one of these | |
| 26. |
Lakes freeze in cold countries in winter, leaving the water underneath at |
| A. | °C |
| B. | °F |
| C. | °C |
| D. | °F |
| Answer» D. °F | |
| 27. |
The density of a gas is maximum at |
| A. | ow temperature, low pressure |
| B. | ow temperature, high pressure |
| C. | igh temperature, low pressure |
| D. | igh temperature, high pressure |
| Answer» C. igh temperature, low pressure | |
| 28. |
The substance which conducts current in the solid state is |
| A. | iamond |
| B. | raphite |
| C. | odine |
| D. | odium chloride |
| Answer» C. odine | |
| 29. |
The colours of stars depend on their |
| A. | emperature |
| B. | istance |
| C. | adius |
| D. | tmospheric pressure |
| Answer» B. istance | |
| 30. |
The magnitude of current flowing between two end points of a conductor is proportional to the potential difference between them and is called as: |
| A. | vogadro's law |
| B. | ault's law |
| C. | hms law |
| D. | araday's law |
| Answer» D. araday's law | |
| 31. |
Indicate the false statement about the resistance of a wire |
| A. | t depends on material of wire |
| B. | t is directly proportional to the length of wire |
| C. | t is directly proportional to the area of cross-section of wire |
| D. | esistance of metallic wire increases with increase in temperature |
| Answer» D. esistance of metallic wire increases with increase in temperature | |
| 32. |
The S.I. unit of electric charge is : |
| A. | mpere |
| B. | oulomb |
| C. | .s.u |
| D. | elvin |
| Answer» C. .s.u | |
| 33. |
For which of the following substances, the resistance decreases with increase in temperature? |
| A. | ure silicon |
| B. | opper |
| C. | ichrome |
| D. | latinum |
| Answer» D. latinum | |
| 34. |
To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor |
| A. | hould be made of a good conductor but can be of any shape |
| B. | hould be in the form of a vertical rod |
| C. | an be of any shape |
| D. | hould be made of a good conductor like copper with sharp-pointed edges |
| Answer» E. | |
| 35. |
An instrument that records earthquakes is |
| A. | rgograph |
| B. | diograph |
| C. | hermograph |
| D. | eismograph |
| Answer» E. | |
| 36. |
The instrument for measuring intensity of earthquakes is called |
| A. | diograph |
| B. | antagraph |
| C. | rgograph |
| D. | eismograph |
| Answer» E. | |
| 37. |
The locomotion of insects to the source of light is called : |
| A. | hototropic |
| B. | ydrotropic |
| C. | hototactic |
| D. | hermotactic |
| Answer» B. ydrotropic | |
| 38. |
It is dangerous to observe Solar eclipse with naked eyes because |
| A. | nfrared radiations from sun burn our retina |
| B. | ltraviolet radiations from Sun burn our retina |
| C. | ll radiations from sun initiate chemical reactions in eyes |
| D. | osmic rays reach eyes more during the eclipse |
| Answer» C. ll radiations from sun initiate chemical reactions in eyes | |
| 39. |
Light houses are places with powerful lights to : |
| A. | uide and resolve traffic jams in crowded metro-cities during nights |
| B. | uide and help large crowds at religious gathering during nights |
| C. | ndicate to the incoming warships, the location of a harbour during night |
| D. | uide and warn the ships coming from different directions in the ocean |
| Answer» E. | |
| 40. |
Who measured the velocity of light first ? |
| A. | alileo |
| B. | ewton |
| C. | omer |
| D. | instein |
| Answer» D. instein | |
| 41. |
Speed of light is maximum in ________ |
| A. | acuum |
| B. | olids |
| C. | iquids |
| D. | ases |
| Answer» B. olids | |
| 42. |
Heat flows as a result of difference of ________ |
| A. | emperature |
| B. | ensity |
| C. | ass |
| D. | olume |
| Answer» B. ensity | |
| 43. |
'Therm' is the unit of |
| A. | ower |
| B. | eat |
| C. | ight |
| D. | istance |
| Answer» C. ight | |
| 44. |
On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because : |
| A. | etals have higher thermal capacity than plastics |
| B. | lastics have a lower density than metals |
| C. | etals are good conductors of heat |
| D. | lastics have a higher thermal conductivity than metals |
| Answer» D. lastics have a higher thermal conductivity than metals | |
| 45. |
During hot weather, the fan produces a feeling of comfort. This is because |
| A. | an supplies cool air |
| B. | an cools the air |
| C. | ur perspiration eva-porates rapidly |
| D. | onductivity of air increases |
| Answer» D. onductivity of air increases | |
| 46. |
A gap is left between two rails of a railway track to accommodate...... of the metal. |
| A. | real expansion |
| B. | olume expansion |
| C. | inear expansion |
| D. | pparent expansion |
| Answer» D. pparent expansion | |
| 47. |
When hot-water is sprinkled on a hotter glass tumbler, it breaks because |
| A. | lass suddenly expands |
| B. | lass suddenly contracts |
| C. | ater evaporates |
| D. | lass reacts chemically with water |
| Answer» C. ater evaporates | |
| 48. |
We feel cool when we sit near the fan, this is because |
| A. | an gives cool air. |
| B. | an cools surrounding air. |
| C. | ir vapourises the sweat on our body. |
| D. | e feel cool when air touches the body. |
| Answer» D. e feel cool when air touches the body. | |
| 49. |
Air coolers are more suitable for |
| A. | ot and humid climate |
| B. | ot and dry climate |
| C. | ool and humid climate |
| D. | ool and dry climate |
| Answer» C. ool and humid climate | |
| 50. |
In a railway track, two rails are joined end to end with a gap in between them because |
| A. | teel can be saved |
| B. | ccidents due to contraction in winter can be avoided |
| C. | ir-gaps are necessary for bearing the weight of running train |
| D. | ccidents due to expansion in summer can be avoided |
| Answer» E. | |