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MCQOPTIONS
This section includes 6820 Mcqs, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.
| 2351. |
The voice of women is thinner than that of men, because the voice of women. . . . . |
| A. | the frequency is higher |
| B. | has a longer wavelength |
| C. | has more dimensions |
| D. | velocity is greater |
| Answer» B. has a longer wavelength | |
| 2352. |
When two loudspeakers are played simultaneously at a place, the listener sitting at a particular place does not hear their sound, because of this? |
| A. | reflection |
| B. | interference |
| C. | refraction |
| D. | resonance |
| Answer» C. refraction | |
| 2353. |
Infrared waves are mechanical waves whose frequency is . . . . . |
| A. | exceeds 20, 000 Hz |
| B. | is greater than 10, 000 Hz |
| C. | is greater than 1,000 Hz |
| D. | less than 20 Hz |
| Answer» E. | |
| 2354. |
Acoustic is science? |
| A. | Relating to light |
| B. | Related to sound |
| C. | Related to climate |
| D. | Related to metal |
| Answer» C. Related to climate | |
| 2355. |
speed of sound in air |
| A. | decreases with increase in temperature |
| B. | increases with decrease in temperature |
| C. | does not depend on temperature |
| D. | decreases with a decrease in temperature |
| Answer» E. | |
| 2356. |
Which of the following type of wave is used in night vision device? |
| A. | Radio wave |
| B. | micro wave |
| C. | infrared wave |
| D. | none of these |
| Answer» D. none of these | |
| 2357. |
When sound waves travel, what do they take with them? |
| A. | mass |
| B. | sound |
| C. | energy |
| D. | Potential difference |
| Answer» D. Potential difference | |
| 2358. |
In which medium will the speed of sound be maximum at a temperature of about 20°C? |
| A. | air |
| B. | granite |
| C. | Water |
| D. | Iron |
| Answer» E. | |
| 2359. |
What is echo sounding used for? |
| A. | to vibrate sound |
| B. | to increase the frequency of sound |
| C. | to measure the depth of the ocean |
| D. | none of the above |
| Answer» D. none of the above | |
| 2360. |
The reason for the resonance? |
| A. | reflection of sound |
| B. | refraction of sound |
| C. | sound absorption |
| D. | speed of sound |
| Answer» B. refraction of sound | |
| 2361. |
The difference between the velocity of an object and the velocity of sound in the same medium and under the same conditions is called? |
| A. | durability number |
| B. | Laplace number |
| C. | octane number |
| D. | mac number |
| Answer» E. | |
| 2362. |
Which of the following causes maximum noise pollution? |
| A. | Car |
| B. | railway engine |
| C. | pop music |
| D. | fly a plane |
| Answer» E. | |
| 2363. |
What are Ultra Sonic Waves? |
| A. | Longitudinal waves of frequency 1000 to 10, 000 Hz |
| B. | Transverse waves of frequency 1000 to 10, 000 Hz |
| C. | Transverse waves of frequency greater than 20, 000 Hz |
| D. | Longitudinal waves of frequency greater than 20, 000 Hz |
| Answer» E. | |
| 2364. |
It is said that when Tansen sang, the glass of the window or the glass glass used to break into pieces. If this is possible, then what quality of sound would it be due to? |
| A. | reflection |
| B. | refraction |
| C. | resonance |
| D. | interference |
| Answer» D. interference | |
| 2365. |
Two people cannot listen to each other on the surface of the moon, because . . . . . . . . . . . |
| A. | their ears stop working on the moon |
| B. | there is no atmosphere on the moon |
| C. | They wear a special type of space suit on the moon. |
| D. | sound travels very slowly on the moon |
| Answer» C. They wear a special type of space suit on the moon. | |
| 2366. |
The Dead Hall has a survival period |
| A. | Zero seconds |
| B. | 0 . 8 seconds |
| C. | 8 seconds |
| D. | 8 seconds |
| Answer» B. 0 . 8 seconds | |
| 2367. |
When we keep the jug under water to fill, we hear a special kind of sound as the jug is filled. this is due to - |
| A. | diffraction |
| B. | Translation |
| C. | interference |
| D. | reflection |
| Answer» D. reflection | |
| 2368. |
What is the decibel unit used for? |
| A. | to the speed of light |
| B. | for heat intensity |
| C. | for sound intensity |
| D. | for the frequency of the radio wave |
| Answer» D. for the frequency of the radio wave | |
| 2369. |
The voice of women is louder than that of men , because of the voice of women . . . . . . . . . |
| A. | Dimensions decrease |
| B. | dimension is greater |
| C. | low voltage |
| D. | the pitch is higher |
| Answer» E. | |
| 2370. |
The fluctuation in the frequency of a sound source is called? |
| A. | of Raman effect |
| B. | of doppler effect |
| C. | of crompton effect |
| D. | photoelectric effect |
| Answer» C. of crompton effect | |
| 2371. |
While shouting, the person always keeps the palm close to the mouth, because . . . . . . . . |
| A. | In that case the sound energy will point in only one direction. |
| B. | sonic fullness of sound increases |
| C. | fluctuating sound tone increases |
| D. | This action has no effect on the sound |
| Answer» B. sonic fullness of sound increases | |
| 2372. |
The reason why a woman's voice is sharper than a man's voice is? |
| A. | higher frequency |
| B. | lower frequency |
| C. | higher dimension |
| D. | Weak speech - fiber |
| Answer» B. lower frequency | |
| 2373. |
The whistling sound of an approaching train increases, while it decreases for a train going farther away. Is this an example? |
| A. | of Raman effect |
| B. | water-thomson effect |
| C. | of crompton effect |
| D. | of doppler effect |
| Answer» E. | |
| 2374. |
Which of the following statements is true for sound waves? |
| A. | they can be polarized |
| B. | Can it work in vacuum? |
| C. | Their speed is 332 m per second at 0 °C. |
| D. | all the above statements are true |
| Answer» D. all the above statements are true | |
| 2375. |
What is the frequency of infrared waves? |
| A. | less than 20 Hz |
| B. | over 20 Hz |
| C. | over 20 , 000 Hz |
| D. | 20 Hz 20,000 Hz |
| Answer» B. over 20 Hz | |
| 2376. |
Velocity of sound in different mediums |
| A. | varies and is highest in solids |
| B. | varies and is lowest in liquids |
| C. | varies and is highest in gas |
| D. | varies and is highest in vacuum |
| Answer» B. varies and is lowest in liquids | |
| 2377. |
Which characteristic of sound makes a sound thick or thin? |
| A. | intensity |
| B. | Equilibrium |
| C. | quality |
| D. | none of these |
| Answer» C. quality | |
| 2378. |
Explosion is not heard on the moon far from the surface - |
| A. | Due to absence of atmosphere |
| B. | due to the decrease in the gravity of the moon |
| C. | Because of the low intensity of sound waves |
| D. | none of the above |
| Answer» B. due to the decrease in the gravity of the moon | |
| 2379. |
Do supersonic planes fly? |
| A. | at the speed of sound |
| B. | less than the speed of sound |
| C. | at the speed of light |
| D. | faster than the speed of sound |
| Answer» E. | |
| 2380. |
Why is the voice of a young child more beloved than the voice of a young man? |
| A. | The pitch of a child's voice is lower than that of a man's voice |
| B. | The pitch of a child's voice is higher than that of a man's voice. |
| C. | child has more power |
| D. | none of the above |
| Answer» C. child has more power | |
| 2381. |
Bats can fly in the dark because . . . . |
| A. | it can be seen clearly in the dark |
| B. | the pupil of his eye is very large |
| C. | she produces very strong waves that control her |
| D. | any bird can do this |
| Answer» D. any bird can do this | |
| 2382. |
If the same note is played on sitar and flute, then the sound produced by it can be distinguished due to the difference in the following? |
| A. | 224 feet |
| B. | 56 feet |
| C. | 28 feet |
| D. | 100 feet |
| Answer» C. 28 feet | |
| 2383. |
When the army crosses the bridge , the soldiers are instructed not to walk step by step , because . . . . . . . |
| A. | There is a risk of bridge breaking due to increased pressure |
| B. | There is a danger of breaking the bridge due to the resonance of the sound produced by the feet. |
| C. | There is a risk of bridge breaking due to the Doppler effect |
| D. | none of the above |
| Answer» C. There is a risk of bridge breaking due to the Doppler effect | |
| 2384. |
Sonar is mostly used in? |
| A. | by astronauts |
| B. | by doctors |
| C. | by engineers |
| D. | by navigators |
| Answer» E. | |
| 2385. |
Which of the following effect is not found in sound waves? |
| A. | Polarization |
| B. | reflection |
| C. | interference |
| D. | diffraction |
| Answer» B. reflection | |
| 2386. |
Sound travels at the maximum speed? |
| A. | in water |
| B. | in steel |
| C. | into the void |
| D. | in hydrogen |
| Answer» C. into the void | |
| 2387. |
How many decibels of sound are produced when two people talk to each other? |
| A. | about 5 decibels |
| B. | about 10 decibels |
| C. | about 30 decibels |
| D. | about 100 decibels |
| Answer» D. about 100 decibels | |
| 2388. |
What is the tolerance limit of noise for humans? |
| A. | 45 decibels |
| B. | 85 decibels |
| C. | 125 decibels |
| D. | 155 decibels |
| Answer» C. 125 decibels | |
| 2389. |
In which medium does sound travel faster? |
| A. | air |
| B. | Clean water |
| C. | Vacuum |
| D. | in iron |
| Answer» E. | |
| 2390. |
In which medium the speed of sound is maximum? |
| A. | Vacuum |
| B. | Solid |
| C. | fluid |
| D. | gas |
| Answer» C. fluid | |
| 2391. |
What is the speed of sound in air? |
| A. | 664 m / sec |
| B. | 332 m / sec |
| C. | 166 m / sec |
| D. | 100 m / sec |
| Answer» C. 166 m / sec | |
| 2392. |
The heat required to change the unit mass of a solid substance from solid to liquid at its melting point is called? |
| A. | melting point of solid |
| B. | solid boiling point |
| C. | latent heat of solid |
| D. | Evaporation |
| Answer» D. Evaporation | |
| 2393. |
Clothes keep us warm in winter because they . . . . . |
| A. | provide heat |
| B. | does not radiate heat |
| C. | prevents air from coming in contact with the body |
| D. | prevents body heat from leaving |
| Answer» E. | |
| 2394. |
What should be the minimum distance between the source of sound and the reflecting surface so that the sound can be heard clearly at |
| A. | 10 meters |
| B. | 17 meters |
| C. | 24 meters |
| D. | 30 meters |
| Answer» C. 24 meters | |
| 2395. |
What is the latent heat of vapor? |
| A. | 536 Cal / g |
| B. | 336 Cal / g |
| C. | 542 Cal / g |
| D. | 34℃ cal/g |
| Answer» B. 336 Cal / g | |
| 2396. |
The temperature of water at the bottom of a huge spring is higher than at the top because . . . . . . |
| A. | Falling water absorbs the heat of the sun |
| B. | bottom water has more potential energy |
| C. | The kinetic energy of falling water is converted into |
| D. | The heat is released from the rocks of the river bed |
| Answer» D. The heat is released from the rocks of the river bed | |
| 2397. |
What happens to the melting point of a pure substance when it is mixed with another substance? |
| A. | rises up |
| B. | happens to |
| C. | remains unchanged |
| D. | first increases then decreases |
| Answer» C. remains unchanged | |
| 2398. |
The hand burns more than the weight , because of the relatively boiling water . . . |
| A. | steam has latent heat |
| B. | steam enters the body |
| C. | steam is lighter |
| D. | Steam has more firepower |
| Answer» B. steam enters the body | |
| 2399. |
Thermocouple. . . . . . . . . . is made by? |
| A. | two non-metals |
| B. | two identical metals |
| C. | two dissimilar metals |
| D. | none of these |
| Answer» D. none of these | |
| 2400. |
If the door of the refrigerator kept in the room is left open. . . . . . . |
| A. | The room will cool down to the temperature inside the refrigerator |
| B. | The room will cool down to even temperature inside the refrigerator |
| C. | the room will gradually warm up |
| D. | The temperature of the air in the room will remain unchanged |
| Answer» D. The temperature of the air in the room will remain unchanged | |