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.
| 101. |
Consider the following statements with reference to X - rays |
| A. | 1, 2 and 3 |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 1 and 3 |
| Answer» B. 1 and 2 | |
| 102. |
Velocity of sound in air |
| 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. | |
| 103. |
With the increase in temperature, the frequency of the sound from an organ pipe |
| A. | Decreases |
| B. | Increases |
| C. | Remain unchanged |
| D. | Changes erractically |
| Answer» C. Remain unchanged | |
| 104. |
A string 1 m long is drawn by a vibrator attached to its end. The string vibrates in three segments. If the frequency of vibration of the vibrator is 480 Hz, then what is the speed of waves through the string ? |
| A. | 160 Hz |
| B. | 320 Hz |
| C. | 480 Hz |
| D. | 640 Hz |
| Answer» D. 640 Hz | |
| 105. |
Sound waves of wavelength greater than that of audible sound are called |
| A. | Infrasonic waves |
| B. | Ultrasonic waves |
| C. | Sonic waves |
| D. | Seismic waves |
| Answer» B. Ultrasonic waves | |
| 106. |
What is the frequency of a wave whose time-period is 0.05 second ? |
| A. | 5 Hz |
| B. | 10 Hz |
| C. | 20 Hz |
| D. | 40 Hz |
| Answer» D. 40 Hz | |
| 107. |
If the ratio of the amplitudes of two waves is 4 : 3, then the ratio of maximum and minimum intensity is |
| A. | 16 : 9 |
| B. | 1 : 16 |
| C. | 1 : 49 |
| D. | 49 : 1 |
| Answer» E. | |
| 108. |
The polarization of electromagnetic wave is in |
| A. | The direction of electric and magnetic field |
| B. | The direction of electric field |
| C. | The direction of magnetic field |
| D. | None of the above |
| Answer» C. The direction of magnetic field | |
| 109. |
If a pendulum is allowed to oscillate into jar containing water, its time period will |
| A. | Increase |
| B. | Decrease |
| C. | Remains same |
| D. | None of these |
| Answer» B. Decrease | |
| 110. |
If the mass of the pendulum is doubled, the time period |
| A. | Becomes double |
| B. | Becomes half |
| C. | Becomes four times |
| D. | Remains same |
| Answer» E. | |
| 111. |
Quality is that sensation of sound which is felt by our ears by virtue of |
| A. | Waveform of sound wave |
| B. | Frequency of sound wave |
| C. | Amplitude of sound wave |
| D. | None of the above |
| Answer» B. Frequency of sound wave | |
| 112. |
The elecromagnetic radiation most prevalent in the atmosphere is |
| A. | Visible light |
| B. | Infrared |
| C. | Ultraviolet |
| D. | Radio waves |
| Answer» C. Ultraviolet | |
| 113. |
An acoustically good hall should have |
| A. | Adequate loudness only |
| B. | Optimum reverberation only |
| C. | Uniform distribution of sound only |
| D. | All the above three |
| Answer» E. | |
| 114. |
The raise the pitch of stringed musical instrument the player can |
| A. | Loosen the string |
| B. | Tighten the string |
| C. | Shorten the string |
| D. | Both (b) and (c) |
| Answer» E. | |
| 115. |
Which radiation emitted from the sun has highest wavelength ? |
| A. | -rays |
| B. | Ultraviolet |
| C. | Red rays |
| D. | Micro waves |
| Answer» E. | |
| 116. |
The ratio of the speed of X - rays to that of gamma rays |
| A. | is < 1 |
| B. | is > 1 |
| C. | is 1 |
| D. | depends upon the ratio of their frequencies |
| Answer» D. depends upon the ratio of their frequencies | |
| 117. |
If the amplitude of a wave at a distance r form a point source is A, the amplitude at a distance 2r will be |
| A. | 2A |
| B. | A |
| C. | A / 2 |
| D. | A / 4 |
| Answer» D. A / 4 | |
| 118. |
The wavelength of microwaves is |
| A. | Smaller than the wavelength of violet light |
| B. | Smaller than the wavelength of yellow light |
| C. | Larger than the wavelength of red light |
| D. | Larger than the wavelength of radio waves |
| Answer» D. Larger than the wavelength of radio waves | |
| 119. |
X - rays absorption will be maximum for the sheets of |
| A. | Silver |
| B. | Lead |
| C. | Copper |
| D. | Iron |
| Answer» C. Copper | |
| 120. |
Red shift is an illustration of |
| A. | Low temperature emission |
| B. | High frequency absorption |
| C. | Doppler effect |
| D. | Unknown phenomenon |
| Answer» D. Unknown phenomenon | |
| 121. |
When a wave goes from one level to another, there is a change in the |
| A. | Only (i) |
| B. | (i) and (ii) |
| C. | (i), (ii) and (iv) |
| D. | All of them |
| Answer» D. All of them | |
| 122. |
The types of waves produced in a sonometer wire are |
| A. | Transverse progressive |
| B. | Transverse stationary |
| C. | Longitudinal progressive |
| D. | Longitudinal stationary |
| Answer» C. Longitudinal progressive | |
| 123. |
The velocity of sound is generally greater in solids than in gases because |
| A. | The density of solids is high and the elasticity is low |
| B. | Both the density and elasticity of solids are very low |
| C. | Th density of solids is low and the elasticity is high |
| D. | The elasticity of solids is very high |
| Answer» E. | |
| 124. |
Which of the following natural source of gamma-rays? |
| A. | Radio cobalt |
| B. | Radio phosphorus |
| C. | Radon gas |
| D. | Radio carbon |
| Answer» D. Radio carbon | |
| 125. |
Consider the following electromagnetic waves |
| 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 | |
| 126. |
When the bob is central position the forces are |
| A. | Balanced |
| B. | Unbalanced |
| C. | Sometimes balanced and sometimes unbalanced |
| D. | None of the above |
| Answer» B. Unbalanced | |
| 127. |
Which one of the following pairs of rays is electromagnetic in nature ? |
| A. | - rays and - rays |
| B. | Cathode rays and X -rays |
| C. | - rays and - rays |
| D. | X -rays and - rays |
| Answer» E. | |
| 128. |
Velocity of electomagnetic waves in a medium depends upon |
| A. | Thermal properties of medium |
| B. | Mechanical and electrical properties of medium |
| C. | Electrical and magnetic properties of medium |
| D. | None of the above |
| Answer» D. None of the above | |
| 129. |
Who firstly predicated the existence of electromagnetic waves ? |
| A. | Hertz |
| B. | Maxwell |
| C. | Marconi |
| D. | Romar |
| Answer» C. Marconi | |
| 130. |
Who discovered wireless communication ? |
| A. | Hertz |
| B. | Maxwell |
| C. | Marconi |
| D. | Newton |
| Answer» D. Newton | |
| 131. |
The same notes being played on sitar and veena differ in |
| A. | Quality |
| B. | Pitch |
| C. | Both quality and pitch |
| D. | none of these |
| Answer» B. Pitch | |
| 132. |
Out of the following, which frequency is not clearly audible to the human ear? |
| A. | 30 Hz |
| B. | 30,000 Hz |
| C. | 300 Hz |
| D. | 3000 Hz |
| Answer» C. 300 Hz | |
| 133. |
X - rays are steams of |
| A. | Electrons |
| B. | Photons |
| C. | Protons |
| D. | None of these |
| Answer» C. Protons | |
| 134. |
The rest mass of a photon is |
| A. | Very small |
| B. | Very large |
| C. | Zero |
| D. | Dependent on velocity |
| Answer» D. Dependent on velocity | |
| 135. |
X - rays are heavily absorbed by lead atoms, but to obtain X - rays photograph of stomach barium sulphate is usually given to the patient instead of lead salt, because |
| A. | Barium salts reflect less |
| B. | Barium salts give brighter image |
| C. | Lead salts are more poisonous |
| D. | Lead salts give fainter image |
| Answer» D. Lead salts give fainter image | |
| 136. |
Microwaves are electromagnetic waves with frequency, in the range of |
| A. | Micro hertz |
| B. | Mega hertz |
| C. | Giga hertz |
| D. | Hertz |
| Answer» D. Hertz | |
| 137. |
Sound waves do not exhibit the phenomenon of |
| A. | Interference |
| B. | Diffraction |
| C. | Refraction |
| D. | Polarisation |
| Answer» E. | |
| 138. |
Ultrasonic waves are used for stirring liquid solutions because they |
| A. | Do not produce noise during the operation |
| B. | Are easy to produce |
| C. | Can produce perfectly homogeneous solution |
| D. | Do not produce chemical reactions in the solution |
| Answer» D. Do not produce chemical reactions in the solution | |
| 139. |
Which does not show polarisation ? |
| A. | Electromagnetic wave |
| B. | Transverse wave in gas |
| C. | Longitudinal wave in gas |
| D. | None of these |
| Answer» D. None of these | |
| 140. |
Pitch is sensation which depends upon |
| A. | Frequency |
| B. | Amplitude |
| C. | Wavelength |
| D. | Velocity |
| Answer» B. Amplitude | |
| 141. |
Laplace's correction in the formula for the speed of sound given by Newton was needed because sound waves |
| A. | Are longitudinal |
| B. | Propagate isothermally |
| C. | Propagate adiabatically |
| D. | Have long wavelengths |
| Answer» D. Have long wavelengths | |
| 142. |
Speed of sound in a gas is proportional to |
| A. | Square root of isothermal elasticity |
| B. | Square root of adiabatic elasticity |
| C. | Isothermal elasticity |
| D. | Adiabatic elasticity |
| Answer» C. Isothermal elasticity | |
| 143. |
Electromagnetic waves are produced by |
| A. | An accelerating charge |
| B. | A static charge |
| C. | Chargeless particle |
| D. | A moving charge |
| Answer» B. A static charge | |
| 144. |
The wavelength of X - rays is of the order of |
| A. | 1 mm |
| B. | 1 cm |
| C. | 1 micron |
| D. | 1 angstrom |
| Answer» E. | |
| 145. |
Sound wave cannot pass through |
| A. | A solid - liquid mixture |
| B. | An ideal gas |
| C. | A liquid gas mixture |
| D. | A perfect vacuum |
| Answer» E. | |
| 146. |
A wave under goes reflection from a rigid boundary. One of its characteristic parameters that changes is |
| A. | Frequency |
| B. | Phase |
| C. | Velocity |
| D. | Wavelength |
| Answer» C. Velocity | |
| 147. |
X - rays are used for the study of crystal structure because |
| A. | X - rays are completely absorbed by the crystal |
| B. | The wavelength of X - rays is of the same order of magnitude as the interatomic spacing in crystals |
| C. | The wavelength of X - rays is very small in comparison with the interatomic spacing in crystals |
| D. | The crystals are completely transparent to X - rays |
| Answer» C. The wavelength of X - rays is very small in comparison with the interatomic spacing in crystals | |
| 148. |
When we hear a sound, we can identify its source from |
| A. | Wave length of sound |
| B. | The overtones present in the sound |
| C. | The intensity of sound |
| D. | The amplitude of sound |
| Answer» C. The intensity of sound | |
| 149. |
The waves moving from a sitar to a listener in air are |
| A. | Longitudinal progressive |
| B. | Longitudinal stationary |
| C. | Transverse progressive |
| D. | Transverse stationary |
| Answer» B. Longitudinal stationary | |
| 150. |
Beats occur because of |
| A. | Interference |
| B. | Reflection |
| C. | Refraction |
| D. | Doppler effect |
| Answer» B. Reflection | |