MCQs

Explanation
The electrons that have been knocked out of the outermost shell of an atom are free electrons , which are able to move freely and conduct electricity.

Explanation
The movement of free electrons is defined as electric current , which is the flow of electrons through a conductor, such as a wire. Electric charge refers to the property of matter, electric field is the force that surrounds charged particles , and electric potential is the potential energy per unit charge.

Explanation
Nuclear fusion is the process by which atomic nuclei combine to form a heavier nucleus, releasing vast amounts of energy in the process. In the case of stars, nuclear fusion occurs when hydrogen atoms fuse together to form helium, releasing energy in the form of light and heat.

Explanation
Stars are massive, luminous balls of gas that are primarily composed of: Hydrogen (about 70%) Helium (about 28%)

Explanation
Resistance (C) is the opposition to the flow of electric current. It is measured in ohms (Ω).

Explanation
In most businesses and homes , electrical circuits are connected in parallel to ensure that : Each device receives the same voltage If one device fails or is turned off, others remain operational The entire circuit doesn't fail if one device is disconnected

Explanation
When two bulbs are connected in a series circuit and one bulb blows, the entire circuit is interrupted, and the other bulb will also stop glowing , i.e., also blow (blast). This is because there is no longer a complete path for current to flow through the circuit.

Explanation
A series circuit is a circuit that provides only one path for the current to flow. If one component is removed or fails , the entire circuit is interrupted.

Explanation
The electrons that have been knocked out of the outermost shell of an atom are free electrons , which are able to move freely and conduct electricity.

Explanation
The movement of free electrons is defined as electric current , which is the flow of electrons through a conductor, such as a wire. Electric charge refers to the property of matter, electric field is the force that surrounds charged particles , and electric potential is the potential energy per unit charge.

Explanation
Dolphins have a wide audible range that is adapted to their aquatic environment. They can hear sounds in the range of 20 Hz to 120,000 Hz , which is far beyond the human audible range.

Explanation
Cats have a unique audible range that is adapted to their hunting and communication needs. They can hear sounds in the range of 45 Hz to 64,000 Hz , which is wider than humans and dogs.

Explanation
Nuclear fusion is the process by which atomic nuclei combine to form a heavier nucleus, releasing vast amounts of energy in the process. In the case of stars, nuclear fusion occurs when hydrogen atoms fuse together to form helium, releasing energy in the form of light and heat.

Explanation
Stars are massive, luminous balls of gas that are primarily composed of: Hydrogen (about 70%) Helium (about 28%)

Explanation
Resistance (C) is the opposition to the flow of electric current. It is measured in ohms (Ω).

Explanation
In most businesses and homes , electrical circuits are connected in parallel to ensure that : Each device receives the same voltage If one device fails or is turned off, others remain operational The entire circuit doesn't fail if one device is disconnected

Explanation
When two bulbs are connected in a series circuit and one bulb blows, the entire circuit is interrupted, and the other bulb will also stop glowing , i.e., also blow (blast). This is because there is no longer a complete path for current to flow through the circuit.

Explanation
A series circuit is a circuit that provides only one path for the current to flow. If one component is removed or fails , the entire circuit is interrupted.

Explanation
The electrons that have been knocked out of the outermost shell of an atom are free electrons , which are able to move freely and conduct electricity.

Explanation
The movement of free electrons is defined as electric current , which is the flow of electrons through a conductor, such as a wire. Electric charge refers to the property of matter, electric field is the force that surrounds charged particles , and electric potential is the potential energy per unit charge.

Explanation
Dolphins have a wide audible range that is adapted to their aquatic environment. They can hear sounds in the range of 20 Hz to 120,000 Hz , which is far beyond the human audible range.

Explanation
Cats have a unique audible range that is adapted to their hunting and communication needs. They can hear sounds in the range of 45 Hz to 64,000 Hz , which is wider than humans and dogs.

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.

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.

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.

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.