12 - இயற்பியல் - அலகு - 10

The correct answer is "அயனி மண்டலப் பரவலை" because the given options are related to different types of waves. "அயனி மண்டலப் பரவலை" refers to electromagnetic waves, which include light waves. The other options, such as "தரை அலை பரவலை" (ground waves) and "பார்வைக் கோட்டின் திசையை" (direction of vision), do not match the topic of waves. Similarly, "புவியின் வளைவை" (motion of the Earth) is not related to waves. Therefore, the correct answer is "அயனி மண்டலப் பரவலை."

The correct answer is "வரிக்கண்ணோட்டம்" which means "Transmission of signals". This is the process of sending signals through telephone lines and converting them into electrical signals. It involves the use of wires or cables to transmit the signals from one location to another.

The correct answer is "Exclude the subtitles from the video". This can be inferred from the statement "படத்தில் சிமிட்டலைத் தவிர்க்க" which translates to "Exclude the subtitles from the video".

In the given passage, it is mentioned that "வீச்சுப் பண்பேற்றத்தில்" (in the blowing wind), the "பட்டை அகலம்" (distance of the leaf) will be affected. The passage further explains that the distance of the leaf will be the same as the movement of the wind, meaning if the wind moves in one direction, the leaf will move in the same direction. Therefore, the correct answer is "சைகை அதிர்வெண்ணின் இரு மடங்காக இருக்கும்" (The leaf will move in the same direction as the wind).

The correct answer is "முழு அக எதிரொளிப்பு" which means "Total internal reflection" in English. This concept is used in the field of optics, where light rays are completely reflected back into a medium when they encounter a boundary with a lower refractive index at an angle greater than the critical angle. This phenomenon is used in various applications such as fiber optics, prism-based devices, and optical communication systems.

The given answer suggests that the main focus in achieving efficiency is to transmit the information with the least amount of distortion. This can be done by connecting different waves with varying frequencies, obtaining the shape of the wave from the original wave, sending the information with low distortion to long distances, and creating sidebands. Additionally, it is important to create physical plates to transmit the information effectively.

மோடம் சைகையாக மாற்றப்படும் முறையிலான சைகைகளைத் தொடர் சைகைகளாக மாற்றப்படுத்துகின்றது.

The correct answer is "கட்டுப்படுத்தும் கிரிடுக்கு" which means "to the broadcasting station". This is because the question is asking about the direction of the hidden signal in a television broadcast, and the signal is transmitted from the broadcasting station to the television grid for display.

High frequency waves are generated in the radio transmitter. These waves are called RF (Radio Frequency) waves. They are used to carry the audio signals and transmit them through the air. RF waves have a higher frequency than the waves used for sound, allowing them to travel long distances without losing their quality. Therefore, the correct answer is "High frequency waves transmit audio signals".

The given answer states that both the structure and amplitude of a sound wave change in the phenomenon of diffraction. This is supported by the information provided in the question, where it is mentioned that the structure and amplitude of the sound wave are affected by the diffraction of the wave. Therefore, it can be concluded that the given answer is a valid explanation for the question.

The given AM radio broadcasts at a frequency of 1.245 MHz. The audio signal is modulated onto the carrier wave, resulting in a sideband frequency of 790 kHz. This means that the transmitted signal will have a frequency of 790 kHz above or below the carrier frequency. Therefore, the correct answer is 790 kHz.

The correct answer is "ஒளிமின் கடத்தல்" which translates to "Optical illusion" in English. The question states that the given object is functioning based on the principles of a certain scientific concept. Out of the given options, only "ஒளிமின் கடத்தல்" fits this description as it refers to the phenomenon where our eyes perceive something differently from what it actually is. Therefore, the object in question is functioning based on the principles of optical illusion.

When a sound wave passes through a medium, it causes particles in the medium to vibrate. This vibration is known as a mechanical wave. In the given options, the correct answer states that the energy of the sound wave is transformed into the kinetic energy of the particles in the medium, causing them to vibrate. This is a fundamental principle of wave propagation, where the energy of a wave is transferred from one particle to another. Therefore, as the sound wave travels, it causes the particles in the medium to oscillate, resulting in the transmission of sound.

The given question is asking for the intermediate frequency (IF) of an AM receiver. The IF is the frequency at which the incoming radio signal is converted to a lower frequency for easier amplification and filtering. In this case, the correct answer is 455 kHz, which is a common IF used in AM receivers.

The given question is asking for the intermediate frequency (IF) value in FM radio. The IF value is the frequency at which the incoming signal is mixed with a local oscillator signal to produce a lower frequency signal that is easier to process. In FM radios, the standard IF value is 10.7 MHz.