MCQOPTIONS
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MCQOPTIONS
This section includes 213 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Sound travels in the form of |
| A. | transverse waves |
| B. | longitudinal waves |
| C. | stationary waves |
| D. | none of above |
| Answer» C. stationary waves | |
| 2. |
Ultrasonics are sound waves of frequency |
| A. | greater than 20,000 Hz |
| B. | less than 10,000 Hz |
| C. | equal to 1000 Hz |
| D. | None of these |
| Answer» B. less than 10,000 Hz | |
| 3. |
Sound above what level (in decibel) is considered hazardous noise pollution? |
| A. | 30 dB |
| B. | 40 dB |
| C. | 60 dB |
| D. | 80 dB |
| Answer» E. | |
| 4. |
Richter scale is used for measuring |
| A. | velocity of sound |
| B. | intensity of light |
| C. | amplitude of seismic waves |
| D. | intensity of sound |
| Answer» D. intensity of sound | |
| 5. |
We cannot hear on the surface of the moon because |
| A. | its surface absorbs sound |
| B. | it has no atmosphere |
| C. | it has very low gravitational force |
| D. | None of these |
| Answer» C. it has very low gravitational force | |
| 6. |
Noise and music differ in their |
| A. | quality |
| B. | tone |
| C. | note |
| D. | pitch |
| Answer» D. pitch | |
| 7. |
Sound cannot travel though |
| A. | solids |
| B. | liquids |
| C. | gases |
| D. | vacuum |
| Answer» E. | |
| 8. |
When a CD (compact disc used in audio and video systems) is seen in sunlight, rainbow like colours are seen. This can be explained on the basis of the phenomenon of |
| A. | reflection and diuffraction |
| B. | reflection and transmission |
| C. | diffraction and transmission |
| D. | refraction, diffraction and transmission |
| Answer» E. | |
| 9. |
Sound travels fastest in |
| A. | vacuum |
| B. | liquid |
| C. | air |
| D. | metal |
| Answer» E. | |
| 10. |
To hear a clear echo, the minimum distance should be |
| A. | 165 feet |
| B. | 165 meter |
| C. | 16.5 feet |
| D. | 16.5 meter |
| Answer» E. | |
| 11. |
A cut diamond sparkles because of its |
| A. | hardness |
| B. | high refractive index |
| C. | emission of light by the diamond |
| D. | absorption of light by the diamond |
| Answer» C. emission of light by the diamond | |
| 12. |
Finger prints on a piece of paper may be detected by sprinkling fluorescent powder on the paper and then looking it into |
| A. | mercury light |
| B. | sunlight |
| C. | infrared light |
| D. | ultraviolet light |
| Answer» E. | |
| 13. |
Kerosene oil rises up in a wick of a lantern because of |
| A. | diffusion of the oil through the wick |
| B. | capillary action |
| C. | buoyant force of air |
| D. | the gravitational pull of the wick |
| Answer» C. buoyant force of air | |
| 14. |
A vibrating body |
| A. | will always produce sound |
| B. | may or may not produce sound if the amplitude of vibration is low |
| C. | will produce sound which depends upon frequency |
| D. | None of these |
| Answer» D. None of these | |
| 15. |
The audible frequency range of a human ear is |
| A. | 20 Hz to 200 Hz |
| B. | 2 Hz to 20 Hz |
| C. | 200 Hz to 2000 Hz |
| D. | 20 Hz to 20000 Hz |
| Answer» E. | |
| 16. |
Microwave oven consumes less power due to |
| A. | small frequency of radiation |
| B. | short wavelength of radiation |
| C. | large frequency as well as wavelength of radiation |
| D. | small frequency as well as wavelength of radiation |
| Answer» C. large frequency as well as wavelength of radiation | |
| 17. |
If you are at open- air concert and someone's head gets between you and the orchestra, you can still hear the orchestra because |
| A. | sound waves pass easily through a head |
| B. | a head is not very large compared with the wavelength of the sound |
| C. | the sound is reflected from the head |
| D. | the wavelength of the sound is much smaller than the head |
| Answer» C. the sound is reflected from the head | |
| 18. |
Bats can ascertain distance, directions, nature and size of the obstacles at night. This is possible by reflection of the emitted |
| A. | ultrasonic waves from the bat |
| B. | ultrasonic waves from the distant objects |
| C. | supersonic waves from the bat |
| D. | supersonic waves from the distant objects |
| Answer» B. ultrasonic waves from the distant objects | |
| 19. |
Consider the following statements with reference to X - rays 1. They produce heat when absorbed by matter2. They are generated when fast moving electrons 3. They can penetrate through a thin sheet of aluminium.Which of the statements given above are correct ? |
| A. | 1, 2 and 3 |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 1 and 3 |
| Answer» B. 1 and 2 | |
| 20. |
A pendulum having period of oscillation of 2s is taken on a planet where g is four times that on earth. The period of the pendulum would be |
| A. | 2 s |
| B. | 1 s |
| C. | 4 s |
| D. | 2 |
| E. | s |
| Answer» C. 4 s | |
| 21. |
The patient is asked to drink barium sulphate (BaSO4) for examining the stomach by X - rays because X - rays are |
| A. | Reflected by heavy atoms |
| B. | Refracted by heavy atoms |
| C. | Less absorbed by heavy atoms |
| D. | More absorbed by heavy atoms |
| Answer» E. | |
| 22. |
Consider the following parts of spectra1. Visible2. Infrared 3. Ultraviolet4. MicrowaveWhich one of the following is the correct sequence in which their wavelengths increase? |
| A. | 4-3-1-2 |
| B. | 4-1-2-3 |
| C. | 3-2-1-4 |
| D. | 3-1-2-4 |
| Answer» E. | |
| 23. |
Velocity of sound in air1. Increases with temperature2. Decreases with temperature3. Increases with pressure 4. Is independent of pressure5. Is independent of temperature |
| A. | only 1 and 2 are true |
| B. | only 2 and 4 are true |
| C. | only 1 and 3 are true |
| D. | only 1 and 4 are true |
| Answer» E. | |
| 24. |
How does the speed V of sound in air depend on atmospheric pressure P ? |
| A. | V P |
| B. | V P |
| C. | V P |
| D. | V P |
| Answer» D. V P | |
| 25. |
The length of the pendulum is doubled and the mass of its bob is halved. Its time period would |
| A. | Become double |
| B. | Become half |
| C. | Become |
| D. | times |
| E. | Remain the same |
| Answer» D. times | |
| 26. |
When a wave goes from one level to another, there is a change in the(i) Velocity(ii) Amplitude(iii) Frequency (iv) Wavelength Choose the correct answer |
| A. | Only (i) |
| B. | (i) and (ii) |
| C. | (i), (ii) and (iv) |
| D. | All of them |
| Answer» D. All of them | |
| 27. |
Consider the following electromagnetic waves1. X - rays2. y - rays3. Microwaves4. radio wavesWhat is the correct sequence in the order of their increasing energy ? |
| A. | 4,3, 1 and 2 |
| B. | 1, 3, 2 and 4 |
| C. | 4, 2, 1 and 3 |
| D. | 1, 4, 3 and 2 |
| Answer» B. 1, 3, 2 and 4 | |
| 28. |
Consider the following statement1. Microwaves are used in radar system for air craft navigation2. Microwave ovens are used for cooking purposes3. A radar using microwave can help in detecting the speed of tennis ball, cricket ball, automobile while in motion.Which of these statements are correct? |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 1 and 3 |
| D. | 1, 2 and 3 |
| Answer» E. | |
| 29. |
If T is the reverberation time of an auditorium of volume V then |
| A. | T V |
| B. | T 1 / V |
| C. | T V |
| D. | T 1 / V |
| Answer» B. T 1 / V | |
| 30. |
Consider the following statements1. Light of longer wavelength is scattered much more than the light of shorter wavelength.2. The speed of visible light in water is 0.95 times the speed in vacuum.3. Radio waves are produced by rapidly oscillating electrical currents.4. To detect the overspending vehicles, police use the Doppler effect of reflected short radio wavesWhich of these statements are correct? |
| A. | 1 and 2 |
| B. | 1 and 3 |
| C. | 2 and 4 |
| D. | 3 and 4 |
| Answer» E. | |
| 31. |
The speed of sound in air at S.T.P. is 300 m / s. If the air pressure becomes double, the temperature remaining the same, the speed of sound would |
| A. | 1200 m / s |
| B. | 600 m / s |
| C. | 300 m / s |
| D. | 300 |
| E. | m / s |
| Answer» D. 300 | |
| 32. |
Assertion (A) : Radio waves bend in a magnetic fieldReason (R) : Radio waves are electromagnetic in nature Codes : |
| A. | A and R are individually true and R is the correct explanation of A |
| B. | A and R are individually true, but R is not the correct explanation of A |
| C. | A is true, but R is false |
| D. | A is false, but R is true |
| Answer» E. | |
| 33. |
The velocity of sound in air is affected by change in the 1. Atmospheric pressure2. Moisture content of air3. Temperature of air4. Composition of airChoose the correct answer |
| A. | 1 and 2 |
| B. | 1, 3 and 4 |
| C. | 1, 2 and 3 |
| D. | 2, 3 and 4 |
| Answer» E. | |
| 34. |
Which of the following statements about electromagnetic wave is / are correct ?1. X - rays in vacuum travel faster than light waves in vacuum.2. The energy of X - rays photon is greater than that of a light photon.3. Light can be polarised but X - rays cannot.Codes |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 1, 2 and 3 |
| D. | Only 2 |
| Answer» E. | |
| 35. |
Consider the following statements :1. X - rays show transverse wave characteristics 2. X - rays can eject electrons from certain metal surfaces3. X - rays of 0.1 A are harder than X - rays of 0.2 A Which of the statements given above is / are correct ? |
| A. | 1 only |
| B. | 1 and 2 only |
| C. | 2 an 3 only |
| D. | 1, 2 and 3 |
| Answer» E. | |
| 36. |
There are three wavelengths 107 m, and 10-10 m, and 10-7 m. Find their respective names |
| A. | X - rays, Visible rays, Radio waves |
| B. | Radio waves, X-rays, Visible rays |
| C. | Visible rays, Radio wave, X-rays |
| D. | None of the above |
| Answer» C. Visible rays, Radio wave, X-rays | |
| 37. |
Consider the following parts of spectra1. Visible2. Infrared3. Ultraviolet4. MicrowaveWhich one of the following is the correct sequence in which their wavelength increase ? |
| A. | 4 - 3 - 1 - 2 |
| B. | 4 - 1 - 2 - 3 |
| C. | 3 - 2 - 1 - 4 |
| D. | 3 - 1 - 2 - 4 |
| Answer» E. | |
| 38. |
Match List - I (Electromagnetic wave) with List - II (Discoverer) and select the correct answer using the codes given belowList-IList-IIF Infrared waves1.W. RoentgenG Ultraviolet rays2.NewtonH X - rays 3.HerschellJ Visible rays4.RitterCodeF G H J A. 1234B. 3412C. 3421D. 4312 |
| A. | A. |
| B. | B. |
| C. | C. |
| D. | D. |
| Answer» C. C. | |
| 39. |
Match List - I (Eletromagnetic radiation) with List - II (Approximate wavelength in metres) and select the correct answer using the codes given below the listsList-IList-IIF Infrared radiation1.10-12G X - rays2.10-5H Ultraviolet radiation 3.10-10 J Gamma rays4.10-8Codes :F G H J A. 2341B. 1432C. 1342D. 2431 |
| A. | A. |
| B. | B. |
| C. | C. |
| D. | D. |
| Answer» B. B. | |
| 40. |
In vacuum, the speed of light |
| A. | Depends on its wavelength |
| B. | Depends on its frequency |
| C. | Depends on its intensity |
| D. | Neither depends on its wavelength, frequency nor intensity |
| Answer» E. | |
| 41. |
Match List - I (type of electromagnetic radiation ) with List - II (corresponding wavelength ) and select the correct answer using the codes given belowList-IList-IIF Radio waves1.4x10-7 - 7x10-7 mG Uitraviolet waves2.10-11 - 10-9 mH Visible light3.10-6 - 10-3 mJ X - rays4.10-3 - 10-5 m5. 10-9 - 107 m CodeF G H J A. 3245B. 4512C. 3542D. 4215 |
| A. | A. |
| B. | B. |
| C. | C. |
| D. | D. |
| Answer» C. C. | |
| 42. |
Consider the following two statements regarding a linearly polarized plane electromagnetic wave1. The electric field and the magnetic field have equal average values2. The electric energy and magnetic energy have equal average values |
| A. | 1 is false but 2 is true |
| B. | both 1 and 2 are true |
| C. | 2 is false but 1 is true |
| D. | both 1 and 2 are false |
| Answer» C. 2 is false but 1 is true | |
| 43. |
Consider the following statements1. sound waves are elastic waves2. In sound waves, the vibrations are perpendicular to the direction in which the wave travels.Which of these statement is / are correct ? |
| A. | 1 only |
| B. | 2 only |
| C. | Both 1 and 2 |
| D. | Neither 1 nor 2 |
| Answer» B. 2 only | |
| 44. |
As a wave strikes against a wall |
| A. | Its phase changes by 180 |
| B. | , but velocity does not change |
| C. | Its phase does not change, but velocity change |
| D. | Its velocity changes and phase too changes by 180 |
| E. | None of the above |
| Answer» B. , but velocity does not change | |
| 45. |
Consider the following statements : X - rays1. Can pass through thin sheets of aluminium2. Can be deflected by magnetic field3. Move with a velocity less than the velocity of ultraviolet rays in vacuumWhich of the statement given above is / are correct ? |
| A. | 1, 2 and 3 |
| B. | 1 only |
| C. | 2 and 3 only |
| D. | 1 and 2 only |
| Answer» C. 2 and 3 only | |
| 46. |
Consider the following statements1. X - rays show transverse wave characteristics2. X - rays can eject electrons from certain metal surfaces3. X - rays of 0. 1 A are harder than X - rays of 0.2 A .Which of the statements given above is / are correct ? |
| A. | 1 only |
| B. | 1 and 2 only |
| C. | 2 and 3 only |
| D. | 1, 2 and 3 |
| Answer» E. | |
| 47. |
Match List - I (frequency range) with List - II (Uses) and select the correct answerList-IList-IIF 54 MHz to 890 MHz1.UHF bandG 1710 kHz to 54 MHz2.Television wavesH 88 MHz to 108 MHz 3.Short wave J 300 MHz to 30,000MHz4.FM radioCodeF G H J A. 1234B. 2341C. 4321D. 3214 |
| A. | A. |
| B. | B. |
| C. | C. |
| D. | D. |
| Answer» C. C. | |
| 48. |
Two waves are given by y1 = a sin ( t - kx ) and y2 = a cos ( t - kx). The phase difference between them is |
| A. | / 4 |
| B. | / 6 |
| C. | / 8 |
| D. | / 2 |
| Answer» E. | |
| 49. |
Consider the following statements1. A geo-stationary satellite is at an approximate height of 10,000 km2. FM transmission of music is a very good quality because the atmospheric or man made noises which are generally frequency variations can do little harm.Which of the statements give above is / are correct? |
| A. | 1 only |
| B. | 2 only |
| C. | Both 1 and 2 |
| D. | Neither 1 nor 2 |
| Answer» C. Both 1 and 2 | |
| 50. |
Some common mediums in which speed of sound of sound?1. Air2. Steel3. Copper4. WaterWhat is the correct increasing order of the speed of sound ? |
| A. | 1 < 4 < 2 < 3 |
| B. | 4 < 1 < 2 < 3 |
| C. | 1 < 4 < 3 < 2 |
| D. | 4 < 1 < 3 < 2 |
| Answer» D. 4 < 1 < 3 < 2 | |