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.
| 151. |
The phenomenon in which the amplitude of oscillation of pendulum decreases gradually is called |
| A. | Decay period of oscillation |
| B. | Damping |
| C. | Building up oscillation |
| D. | Maintained oscillation |
| Answer» C. Building up oscillation | |
| 152. |
Polarization in electro magnetic wave is caused by |
| A. | Reflection |
| B. | Refraction |
| C. | Transverse nature of electromagnetic waves |
| D. | Longitudinal nature of electromagnetic waves |
| Answer» D. Longitudinal nature of electromagnetic waves | |
| 153. |
The ozone layer in the atmosphere is at a height of about |
| A. | 25 km |
| B. | 50 km |
| C. | 100 km |
| D. | 200 km |
| Answer» C. 100 km | |
| 154. |
Sound waves cannot be polarised because they |
| A. | Require a material medium for propagation |
| B. | Are longitudinal |
| C. | Are transverse |
| D. | Have low velocity |
| Answer» C. Are transverse | |
| 155. |
Stationary waves of frequency 300 Hz are formed in a medium in which the velocity of sound is 1200 m/s. The distance between a node and the neighbouring anti node is |
| A. | 1 m |
| B. | 2 m |
| C. | 3 m |
| D. | 4 m |
| Answer» B. 2 m | |
| 156. |
The walls of the halls built for music concerts should |
| A. | Amplify sound |
| B. | Reflect sound |
| C. | Ransmit sound |
| D. | Absorb sound |
| Answer» E. | |
| 157. |
When two sound waves are superimposed, beats are produced when they have |
| A. | Different amplitudes and phases |
| B. | Different velocities |
| C. | Different phases |
| D. | Different frequencies |
| Answer» E. | |
| 158. |
Two waves of the same frequency and intensity superimpose with each other in opposite phases. Then after superposition the |
| A. | Intensity increases to four times |
| B. | Intensity increases to two times |
| C. | Frequency increases to four times |
| D. | None of the above |
| Answer» E. | |
| 159. |
Penetrating power of X - rays can be increased by |
| A. | Increasing the potential difference |
| B. | Decreasing the potential difference between anode and cathode |
| C. | Decreasing the current of cathode filament |
| D. | Increasing the current of cathode filament |
| Answer» B. Decreasing the potential difference between anode and cathode | |
| 160. |
The velocity of sound in air is affected by change in the |
| A. | 1 and 2 |
| B. | 1, 3 and 4 |
| C. | 1, 2 and 3 |
| D. | 2, 3 and 4 |
| Answer» E. | |
| 161. |
Which of the following statements about electromagnetic wave is / are correct ? |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 1, 2 and 3 |
| D. | Only 2 |
| Answer» E. | |
| 162. |
The velocities of sound in air and water are 336 m / s and 1470 m/s respectively. Two sources producing waves of wavelength 6 m and 7 m sounded togather will produce beats |
| A. | That can be heard in both the media |
| B. | That can be heard only in water and not in air |
| C. | That can be heard only in air and not in water |
| D. | That can not be heard in either media |
| Answer» D. That can not be heard in either media | |
| 163. |
A radar beam consists of |
| A. | X - rays |
| B. | Infrared rays |
| C. | Ultraviolet - rays |
| D. | Microwaves |
| Answer» E. | |
| 164. |
The echo will be heard if the original sound reflected by an obstacle in |
| A. | 10 s |
| B. | 0.50 s |
| C. | 15 s |
| D. | 0.1 s |
| Answer» E. | |
| 165. |
The waves used for a communication through artificial satellites are |
| A. | Microwaves |
| B. | Radio waves in the AM band |
| C. | Radio waves in the FM band |
| D. | None of the above |
| Answer» B. Radio waves in the AM band | |
| 166. |
Who firstly demonstrated experimentally the existance of electromagnetic wave ? |
| A. | Hertz |
| B. | Maxwell |
| C. | Marconi |
| D. | Newton |
| Answer» B. Maxwell | |
| 167. |
Radio waves of constant amplitude can be generated with |
| A. | Filter |
| B. | Rectifier |
| C. | FET |
| D. | Oscillator |
| Answer» E. | |
| 168. |
Match List - I (Electromagnetic wave) with List - II (Discoverer) and select the correct answer using the codes given below |
| A. | A. |
| B. | B. |
| C. | C. |
| D. | D. |
| Answer» C. C. | |
| 169. |
Match List - I (Eletromagnetic radiation) with List - II (Approximate wavelength in metres) and select the correct answer using the codes given below the lists |
| A. | A. |
| B. | B. |
| C. | C. |
| D. | D. |
| Answer» B. B. | |
| 170. |
Match List - I (frequency range) with List - II (Uses) and select the correct answer |
| A. | A. |
| B. | B. |
| C. | C. |
| D. | D. |
| Answer» C. C. | |
| 171. |
Which of the following is different from the others ? |
| A. | Amplitude |
| B. | Velocity |
| C. | Frequency |
| D. | Wavelength |
| Answer» B. Velocity | |
| 172. |
Match List - I (type of electromagnetic radiation ) with List - II (corresponding wavelength ) and select the correct answer using the codes given below |
| A. | A. |
| B. | B. |
| C. | C. |
| D. | D. |
| Answer» C. C. | |
| 173. |
When an aeroplane attains a speed higher than the speed of sound in air a loud bang is heared. This is because |
| A. | It explodes |
| B. | Its wings vibrate so violently that the bang is heard |
| C. | The normal engine noises undergo a Doppler shift to generate the bang |
| D. | It produces a shock wave which is received as the bang |
| Answer» E. | |
| 174. |
Consider the following two statements regarding a linearly polarized plane electromagnetic wave |
| 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 | |
| 175. |
Speed of electromagnetic wave is the same |
| A. | For all wavelengths |
| B. | For all frequencies |
| C. | In all media |
| D. | For all intensities |
| Answer» E. | |
| 176. |
For television broadcasting, the frequency employed is normally |
| A. | 30 - 300 MHx |
| B. | 30 - 300 GHz |
| C. | 30 - 300 kHz |
| D. | 30 - 300 Hz |
| Answer» B. 30 - 300 GHz | |
| 177. |
The ionosphere is mainly composed of |
| A. | Nitrogen and oxygen |
| B. | Ozone |
| C. | Electrons and positive ions |
| D. | None of the above |
| Answer» D. None of the above | |
| 178. |
Consider the following statements : X - rays |
| A. | 1, 2 and 3 |
| B. | 1 only |
| C. | 2 and 3 only |
| D. | 1 and 2 only |
| Answer» C. 2 and 3 only | |
| 179. |
When the frequency distribution is normal. |
| A. | Median, mode and mean are all different from one another |
| B. | Mean, mode and median are identical |
| C. | Mean is greater than mode |
| D. | Mean is greater than median |
| Answer» C. Mean is greater than mode | |
| 180. |
The ozone layer absorbs |
| A. | Infrared radiation |
| B. | Ultraviolet radiation |
| C. | X - rays |
| D. | y - rays |
| Answer» C. X - rays | |
| 181. |
Which one of the following is the correct sequence of wavelengths of radiations ? |
| A. | UV > Green > IR > Hard X - rays |
| B. | IR > Green > UV > Hard X - rays |
| C. | UV > Hard > IR > Green |
| D. | IR > Hard X - rays > Green > UV |
| Answer» C. UV > Hard > IR > Green | |
| 182. |
Electromagnetic waves can travel through |
| A. | Space where there are no electric and magnetic field. |
| B. | A medium such as air and water |
| C. | Electric field or magnetic field |
| D. | Both (a) and (b) |
| Answer» E. | |
| 183. |
When a source of sound is in motion towards a stationary observer, the effect observed is |
| A. | Increase in the velocity of sound only |
| B. | Decrease in the velocity of sound only |
| C. | Increase in frequency of sound only |
| D. | Increase in both the velocity and the frequency sound |
| Answer» D. Increase in both the velocity and the frequency sound | |
| 184. |
The technique used to transmit audio signal in television broadcasts is |
| A. | Amplitude modulation |
| B. | Frequency modulation |
| C. | Pulse code modulation |
| D. | Time division multiplexing |
| Answer» C. Pulse code modulation | |
| 185. |
When the same note is played on a sitar and flute, the sound produced can be distinguished from each other because of the difference in |
| A. | Pitch, loudness and quality |
| B. | Pitch and loudness |
| C. | Quality only |
| D. | Loudness only |
| Answer» D. Loudness only | |
| 186. |
What frequency range of E.M. waves are used for commercial FM radio ? |
| A. | 88 MHz to 108 MHz |
| B. | 88 kHz to 108 kHz |
| C. | 88 GHz to 108 GHz |
| D. | None of these |
| Answer» B. 88 kHz to 108 kHz | |
| 187. |
A sonometer wire having a length of 50 cm is vibrating in the fundamental made with a frequency of 100 Hz. Which of the following is the type of propagating wave and its speed ? |
| A. | Longitudinal, 50 m / s |
| B. | Transverse, 50 m / s |
| C. | Longitudinal, 100 m / s |
| D. | Transverse, 100 m / s |
| Answer» E. | |
| 188. |
Sound moves with higher velocity if |
| A. | Pressure of the medium is decreased |
| B. | Temperature of the medium is increased |
| C. | Humidity of the medium is decreased |
| D. | Both (b) and (c) |
| Answer» E. | |
| 189. |
An accelerated electron would produce |
| A. | - rays |
| B. | y - rays |
| C. | - rays |
| D. | E.M. rays |
| Answer» E. | |
| 190. |
Two waves are given by y |
| A. | / 4 |
| B. | / 6 |
| C. | / 8 |
| D. | / 2 |
| Answer» E. | |
| 191. |
Doppler shift in frequency does not depend upon |
| A. | The actual frequency of the wave |
| B. | The distance of the source from the listener |
| C. | The velocity of the source |
| D. | The velocity of the observer |
| Answer» C. The velocity of the source | |
| 192. |
If the density of oxygen is 16 times that of hydrogen, what will be the ratio of the velocities of sound in them ? |
| A. | 1 : 4 |
| B. | 4 : 1 |
| C. | 2 : 1 |
| D. | 1 : 16 |
| Answer» B. 4 : 1 | |
| 193. |
Which one of the following types of glass can cut of ultraviolet rays ? |
| A. | Soda glass |
| B. | Pyrex glass |
| C. | Jena glass |
| D. | Crookes glass |
| Answer» E. | |
| 194. |
Stationary waves are so called because in them |
| A. | The particles of the medium are not disturbed at all |
| B. | The particles of the medium do not execute SHM |
| C. | These occurs no flow of energy |
| D. | The interference effect can't be observed |
| Answer» D. The interference effect can't be observed | |
| 195. |
Some common mediums in which speed of sound 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 | |
| 196. |
An echo will be heard if the minimum distance between the source of sound and obstacle is |
| A. | 1 m |
| B. | 10 m |
| C. | 15 m |
| D. | 17 m |
| Answer» E. | |
| 197. |
The audible frequency range of a human ear is |
| A. | 20 hertz to 200 hertz |
| B. | 2 hertz to 20 hertz |
| C. | 200 hertz to 2000 hertz |
| D. | 20 hertz to 20000 hertz |
| Answer» E. | |
| 198. |
The frequencies of X - rays, y-rays and ultraviolet rays are respectively a, b and c then |
| A. | a < b, b > c |
| B. | a > b, b > c |
| C. | a > b, b < c |
| D. | a < b, b < c |
| Answer» B. a > b, b > c | |
| 199. |
There are three wavelengths 10 |
| 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 | |
| 200. |
Consider the following parts of spectra |
| A. | 4 - 3 - 1 - 2 |
| B. | 4 - 1 - 2 - 3 |
| C. | 3 - 2 - 1 - 4 |
| D. | 3 - 1 - 2 - 4 |
| Answer» E. | |