MCQs

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The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. 

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The earliest known audio tape recorder was a non-magnetic, non-electric version invented by Alexander Graham Bell's Volta Laboratory and patented in 1886.

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Mass media refers to a diverse array of media technologies that reach a large audience via mass communication. 

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Light rays from the sun appear to the naked eye as white light, but each ray contains a broad range of wavelengths

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Because the Earth rotates on its axis, circulating air is deflected toward the right in the Northern Hemisphere and toward the left in the Southern Hemisphere. This deflection is called the Coriolis effect.

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The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. 

Explanation
The earliest known audio tape recorder was a non-magnetic, non-electric version invented by Alexander Graham Bell's Volta Laboratory and patented in 1886.

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Mass media refers to a diverse array of media technologies that reach a large audience via mass communication. 

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Light rays from the sun appear to the naked eye as white light, but each ray contains a broad range of wavelengths

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Because the Earth rotates on its axis, circulating air is deflected toward the right in the Northern Hemisphere and toward the left in the Southern Hemisphere. This deflection is called the Coriolis effect.

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The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. 

Explanation
The earliest known audio tape recorder was a non-magnetic, non-electric version invented by Alexander Graham Bell's Volta Laboratory and patented in 1886.

Explanation
Mass media refers to a diverse array of media technologies that reach a large audience via mass communication. 

Explanation
Light rays from the sun appear to the naked eye as white light, but each ray contains a broad range of wavelengths

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Explanation
Because the Earth rotates on its axis, circulating air is deflected toward the right in the Northern Hemisphere and toward the left in the Southern Hemisphere. This deflection is called the Coriolis effect.

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Explanation

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Explanation

Explanation
The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. 

Explanation
The earliest known audio tape recorder was a non-magnetic, non-electric version invented by Alexander Graham Bell's Volta Laboratory and patented in 1886.

Explanation
Mass media refers to a diverse array of media technologies that reach a large audience via mass communication. 

Explanation
Light rays from the sun appear to the naked eye as white light, but each ray contains a broad range of wavelengths

Explanation

Explanation
Because the Earth rotates on its axis, circulating air is deflected toward the right in the Northern Hemisphere and toward the left in the Southern Hemisphere. This deflection is called the Coriolis effect.

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Dogs can hear sounds in the range of 67 Hz to 45,000 Hz , which is slightly higher than the human audible range.

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Whales have a unique audible range that is adapted to their underwater environment. They can hear sounds at very low frequencies , often below 20 Hz, and up to 31 kHz.

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Elephants can hear sounds in the range of 16 Hz to 20,000 Hz.

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Echoes are repeating sounds that are reflected back to the listener after the original sound has stopped. They are a result of sound waves bouncing off a surface and returning to the listener , creating a repeated or echoic effect.

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The speed of sound in diamond is approximately 12,000 meters per second (m/s). It is one of the fastest speeds of sound among all materials. The speeds of sound in different materials: Air: 343 m/s Water: 1433 m/s Wood: 3300-3600 m/s Brick: 4176 m/s Steel: 6100 m/s Diamond: 12000 m/s

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The speed of sound in air at sea level and 20°C (68°F) is approximately 343 meters per second . The speeds of sound in different materials: Air: 343 m/s Water: 1433 m/s Wood: 3300-3600 m/s Brick: 4176 m/s Steel: 6100 m/s Diamond: 12000 m/s

Explanation
Sound travels slowest in air , with a speed of approximately 343 meters per second (m/s) at 20°C. This is because air is a gas and has a low density and stiffness , which allows sound waves to propagate more slowly through the material. The speeds of sound in different materials: Air: 343 m/s Water: 1433 m/s Wood: 3300-3600 m/s Brick: 4176 m/s Steel: 6100 m/s Diamond: 12000 m/s

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The velocity of a wave (v) is equal to the product of its wavelength (λ) and frequency (f). This is expressed mathematically as: v = λf

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Frequency is the number of vibrations or oscillations produced by a vibrating body in one second. It's measured in Hertz (Hz) , where 1 Hz equals one vibration per second.

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Decibel (dB) is the unit used to measure sound intensity. Which is related to the amplitude of a sound wave. The amplitude of a sound wave determines the loudness of the sound One decibel (0.1 bel) equals 10 times the common logarithm of the power ratio.

Explanation
Dogs can hear sounds in the range of 67 Hz to 45,000 Hz , which is slightly higher than the human audible range.

Explanation
Whales have a unique audible range that is adapted to their underwater environment. They can hear sounds at very low frequencies , often below 20 Hz, and up to 31 kHz.

Explanation
Elephants can hear sounds in the range of 16 Hz to 20,000 Hz.

Explanation
Echoes are repeating sounds that are reflected back to the listener after the original sound has stopped. They are a result of sound waves bouncing off a surface and returning to the listener , creating a repeated or echoic effect.

Explanation
The speed of sound in diamond is approximately 12,000 meters per second (m/s). It is one of the fastest speeds of sound among all materials. The speeds of sound in different materials: Air: 343 m/s Water: 1433 m/s Wood: 3300-3600 m/s Brick: 4176 m/s Steel: 6100 m/s Diamond: 12000 m/s

Explanation
The speed of sound in air at sea level and 20°C (68°F) is approximately 343 meters per second . The speeds of sound in different materials: Air: 343 m/s Water: 1433 m/s Wood: 3300-3600 m/s Brick: 4176 m/s Steel: 6100 m/s Diamond: 12000 m/s

Explanation
Sound travels slowest in air , with a speed of approximately 343 meters per second (m/s) at 20°C. This is because air is a gas and has a low density and stiffness , which allows sound waves to propagate more slowly through the material. The speeds of sound in different materials: Air: 343 m/s Water: 1433 m/s Wood: 3300-3600 m/s Brick: 4176 m/s Steel: 6100 m/s Diamond: 12000 m/s

Explanation
The velocity of a wave (v) is equal to the product of its wavelength (λ) and frequency (f). This is expressed mathematically as: v = λf

Explanation
Frequency is the number of vibrations or oscillations produced by a vibrating body in one second. It's measured in Hertz (Hz) , where 1 Hz equals one vibration per second.

Explanation
Decibel (dB) is the unit used to measure sound intensity. Which is related to the amplitude of a sound wave. The amplitude of a sound wave determines the loudness of the sound One decibel (0.1 bel) equals 10 times the common logarithm of the power ratio.