MCQOPTIONS
Saved Bookmarks
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.
| 51. |
In a stationary wave all the particles of the medium |
| A. | Cross the mean position with different velocities at different instants |
| B. | Cross the mean position with different velocities at the same instant |
| C. | Cross the mean position with same velocity |
| D. | Cross the mean position with same speed |
| Answer» C. Cross the mean position with same velocity | |
| 52. |
Consider the following statements :Assertion (A) : The velocity of sound in air increases due to the presence of moisture in itReason (R) : The presence of moisture in air lowers the density of air of these statements Codes |
| A. | Both A and R are true and R is the correct explanation of A |
| B. | Both A and R are 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» B. Both A and R are true but R is not the correct explanation of A | |
| 53. |
To |
| A. | 165 feet |
| B. | 165 meter |
| C. | 16.5 feet |
| D. | 16.5 meter |
| Answer» E. | |
| 54. |
Finger prints |
| A. | mercury light |
| B. | sunlight |
| C. | infrared light |
| D. | ultraviolet light |
| Answer» E. | |
| 55. |
Ultrasonics |
| 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 | |
| 56. |
Sound travels |
| A. | transverse waves |
| B. | longitudinal waves |
| C. | stationary waves |
| D. | none of above |
| Answer» C. stationary waves | |
| 57. |
Sound |
| A. | 30 dB |
| B. | 40 dB |
| C. | 60 dB |
| D. | 80 dB |
| Answer» E. | |
| 58. |
Richter scale |
| A. | velocity of sound |
| B. | intensity of light |
| C. | amplitude of seismic waves |
| D. | intensity of sound |
| Answer» D. intensity of sound | |
| 59. |
We |
| 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 | |
| 60. |
Microwave oven |
| 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 | |
| 61. |
Bats |
| 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 | |
| 62. |
If you are at |
| 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 | |
| 63. |
Noise |
| A. | quality |
| B. | tone |
| C. | note |
| D. | pitch |
| Answer» D. pitch | |
| 64. |
Sound |
| A. | solids |
| B. | liquids |
| C. | gases |
| D. | vacuum |
| Answer» E. | |
| 65. |
When a CD (compact disc used in audio and video systems) is seen in |
| A. | reflection and diuffraction |
| B. | reflection and transmission |
| C. | diffraction and transmission |
| D. | refraction, diffraction and transmission |
| Answer» E. | |
| 66. |
Transverse waves can propagate |
| A. | Both in a gas and in a metal |
| B. | In a gas but not in a metal |
| C. | Not in a gas but in a metal |
| D. | Neither in a gas nor in a metal |
| Answer» D. Neither in a gas nor in a metal | |
| 67. |
For harder X -rays |
| A. | The wavelength is higher |
| B. | The intensity is higher |
| C. | The frequency is higher |
| D. | None of the above |
| Answer» D. None of the above | |
| 68. |
Which one of the following explains that all the galaxies are receding from us |
| A. | White dwarfs |
| B. | Neutrons stars |
| C. | Black holes |
| D. | Red shift |
| Answer» E. | |
| 69. |
The loudness of sound depends upon |
| A. | Velocity |
| B. | Pitch |
| C. | Amplitude |
| D. | Wavelength |
| Answer» D. Wavelength | |
| 70. |
Which of the following electromagnetic radiations has the smallestwavelength ? |
| A. | Microwaves |
| B. | Ultraviolet |
| C. | X - rays |
| D. | Gamma rays |
| Answer» E. | |
| 71. |
Maximum value of the wavelength of ultrasonic waves is |
| A. | 33 cm |
| B. | 1.65 cm |
| C. | 1.65 m |
| D. | 20 cm |
| Answer» C. 1.65 m | |
| 72. |
An empty vessel is partially filled with water. The frequency of vibration of air column in the vessel |
| A. | Increases |
| B. | Decreases |
| C. | Remains the same |
| D. | None of these |
| Answer» B. Decreases | |
| 73. |
The velocity of light in vacuum can be changed by changing |
| A. | Frequency |
| B. | Amplitude |
| C. | Wavelength |
| D. | None of these |
| Answer» E. | |
| 74. |
Which of the following type of waves is different from others ? |
| A. | Light waves |
| B. | X - rays |
| C. | Radio waves |
| D. | Sound waves |
| Answer» E. | |
| 75. |
Which one of the following does TV remote control unit use to operate a TV set? |
| A. | Light waves |
| B. | Sound waves |
| C. | Micro Waves |
| D. | Radio waves |
| Answer» E. | |
| 76. |
Ultra violet light of sun's radiation is prevented from reaching the earth's atmosphere by the layer of |
| A. | Oxygen |
| B. | Hydrogen |
| C. | Ozone |
| D. | Helium |
| Answer» D. Helium | |
| 77. |
The velocity of light is maximum in |
| A. | Diamond |
| B. | Water |
| C. | Vacuum |
| D. | Glass |
| Answer» D. Glass | |
| 78. |
Which are the relevant waves in telecommunication ? |
| A. | X - rays |
| B. | Violet - rays |
| C. | Microwaves |
| D. | All of them |
| Answer» D. All of them | |
| 79. |
The Doppler's effect is applicable for |
| A. | Light wave |
| B. | Sound wave |
| C. | Space wave |
| D. | Both (a) and (b) |
| Answer» E. | |
| 80. |
X- rays were discovered by |
| A. | Roentgen |
| B. | Becquerel |
| C. | Curie |
| D. | Van lane |
| Answer» B. Becquerel | |
| 81. |
Pitch of sound depends on |
| A. | Frequency |
| B. | Wavelength |
| C. | Amplitude |
| D. | Speed |
| Answer» B. Wavelength | |
| 82. |
When light waves pass from air to glass, the variables affected are |
| A. | Wavelength, frequency and velocity |
| B. | Velocity and frequency |
| C. | Wavelength and frequency |
| D. | Wavelength and velocity |
| Answer» E. | |
| 83. |
The velocity of sound in a gas depends on |
| A. | Wavelength only |
| B. | Density and elasticity of gas |
| C. | Intensity only |
| D. | Amplitude and frequency |
| Answer» C. Intensity only | |
| 84. |
Ultrasonic waves are those waves which |
| A. | Human beings cannot hear |
| B. | Human beings can hear |
| C. | Have high velocity |
| D. | Have large amplitude |
| Answer» B. Human beings can hear | |
| 85. |
The period of pendulum depends upon |
| A. | Mass |
| B. | Length |
| C. | Amplitude |
| D. | Energy |
| Answer» C. Amplitude | |
| 86. |
The product of the time period of a wave and its frequency is |
| A. | Infinite |
| B. | Zero |
| C. | Unity |
| D. | None of these |
| Answer» D. None of these | |
| 87. |
With the rise of temperature, the speed of sound in a gas |
| A. | Increases |
| B. | Decreases |
| C. | Remains the same |
| D. | None of these |
| Answer» B. Decreases | |
| 88. |
Sound waves in air are ........... waves |
| A. | Longitudinal |
| B. | Radio |
| C. | Transverse |
| D. | Electromagnetic |
| Answer» B. Radio | |
| 89. |
Resonance is a special case of |
| A. | Forced vibration |
| B. | Natural vibration |
| C. | Damped vibration |
| D. | None of these |
| Answer» B. Natural vibration | |
| 90. |
Mechanical waves |
| A. | Are longitudinal only |
| B. | Transverse only |
| C. | Can be both longitudinal and transverse |
| D. | None of the above |
| Answer» D. None of the above | |
| 91. |
Ultrasonic waves can be detected by |
| A. | Telephone |
| B. | Hebb's method |
| C. | Kundt's tube |
| D. | Quincke's tube |
| Answer» D. Quincke's tube | |
| 92. |
A sound wave having wavelength forms stationary waves after reflection from a surface. The distance between two consecutive nodes is |
| A. | |
| B. | / 2 |
| C. | / 4 |
| D. | / 8 |
| Answer» C. / 4 | |
| 93. |
The patient is asked to drink barium sulphate (BaSO |
| A. | Reflected by heavy atoms |
| B. | Refracted by heavy atoms |
| C. | Less absorbed by heavy atoms |
| D. | More absorbed by heavy atoms |
| Answer» E. | |
| 94. |
Penetrating power of X-rays does not depend on |
| A. | Wavelength |
| B. | Energy |
| C. | Potential difference |
| D. | Current in the filament |
| Answer» E. | |
| 95. |
When X -rays are produced, then |
| A. | Heat is produced on the target |
| B. | Heat is observed by the target |
| C. | Temperature of the target is being constant |
| D. | A luminous light is to be seen on the target |
| Answer» D. A luminous light is to be seen on the target | |
| 96. |
Structure of solids is investigated by using |
| A. | cosmic rays |
| B. | X - rays |
| C. | y - rays |
| D. | Infrared radiation |
| Answer» C. y - rays | |
| 97. |
Which among the following is the necessary condition for simple harmonic motion? |
| A. | Constant period |
| B. | Constant acceleration |
| C. | Acceleration is proportional to the displacement form mean position and is always directed towards it |
| D. | Displacement and torque are proportional |
| Answer» E. | |
| 98. |
In which of the following sequences are the electromagnetic radiations in decreasing order of wave lengths |
| A. | Infrared, radio, X - rays, visible |
| B. | Radio, infrared, visible, X- rays |
| C. | Radio, visible, infrared, X -rays |
| D. | X- rays, visible, infrared, radio |
| Answer» B. Radio, infrared, visible, X- rays | |
| 99. |
X -rays are not used for radar purpose because |
| A. | They are not reflected by the target |
| B. | They are completely absorbed by air |
| C. | They are not electromagnetic wave |
| D. | None of the above |
| Answer» D. None of the above | |
| 100. |
Decibel is a |
| A. | Musical note |
| B. | Musical instrument |
| C. | Unit of intensity |
| D. | Unit of energy |
| Answer» D. Unit of energy | |