A) It is the amount of heat absorbed or released during a change of state. B) It is a measure of the intensity of heat. C) It depends on the mass of the substance. D) It is associated with a change in temperature.
A) Change the state of a substance without a change in temperature. B) Change 1 kg of a solid to a liquid at its melting point. C) Change 1 kg of a liquid to a gas at its boiling point. D) Increase the temperature of 1 kg of a substance by 1°C.
A) Amount of heat required to melt 1 kg of the substance. B) Time taken for the substance to melt completely. C) Change in temperature when the substance melts. D) Total amount of heat absorbed during melting.
A) Purity B) Mass C) PressureTemperature
A) Change 1 kg of a solid to a liquid at its melting point. B) Change the state of a substance without a change in temperature. C) Change 1 kg of a liquid to a gas at its boiling point. D) Increase the temperature of 1 kg of a substance by 1°C.
A) Time taken for the substance to vaporize completely. B) Change in temperature when the substance vaporizes. C) Total amount of heat absorbed during vaporization. D) Amount of heat required to vaporize 1 kg of the substance.
A) By measuring the amount of heat absorbed to melt a known mass. B) By measuring the volume change during melting. C) b) By measuring the time taken for a specific mass to melt. D) By measuring the change in temperature during melting.
A) The relationship depends on the specific substance. B) The specific latent heat of vaporization is always greater. C) They are always equal. D) The specific latent heat of fusion is always greater.
A) The effect depends on the specific impurity. B) Impurities increase the boiling point. C) Impurities decrease the boiling point. D) Impurities have no effect on the boiling point.
A) The effect depends on the specific liquid. B) Pressure has no effect on the boiling point. C) Increasing pressure increases the boiling point. D) Increasing pressure decreases the boiling point.
A) Both involve a change of state from liquid to gas. B) Evaporation is a slower process than boiling. C) a) Evaporation occurs only at the boiling point, while boiling can occur at any temperature. D) Boiling occurs only at the boiling point, while evaporation can occur at any temperature.
A) The temperature at which the substance starts to melt. B) The temperature at which the substance changes from a gas to a liquid. C) The temperature at which the solid and liquid phases coexist in equilibrium. D) The temperature at which the substance is completely liquid.
A) By measuring the volume change B) By measuring the change in temperature during melting. C) By observing the change in state from solid to liquid. D) By measuring the time taken for a specific mass to melt.
A) All of the above B) By measuring the time taken for a specific mass to melt. C) By measuring the amount of heat absorbed to melt a known mass. D) By measuring the change in temperature during melting.
A) None of the above B) Time taken for melting C) Change in temperature D) Change in volume
A) By measuring the time taken for a specific mass to vaporize. B) All of the above C) By measuring the amount of heat absorbed to vaporize a known mass. D) By measuring the change in temperature during boiling.
A) None of the above B) Time taken for vaporization C) Change in temperature (boiling point) D) Change in volume
A) Mass of the substance and type of container B) None of the above C) Both (a) and (b) D) Pressure and temperature
A) To maintain a constant temperature. B) To ensure accurate measurement of heat absorbed. C) All of the above. D) To prevent heat loss to the surroundings.
A) Reflection of waves B) Refraction of waves C) All of the above D) Diffraction of waves
A) Water, sound, and light B) Mechanical, electromagnetic, and sound C) Transverse, longitudinal, and stationary D) Both (a) and (b)
A) Amplitude, intensity, and energy B) Displacement, velocity, and acceleration C) Wavelength, frequency, and speed D) Pressure, temperature, and volume
A) Frequency B) Amplitude C) Speed D) Wavelength
A) Frequency remains the same. B) All of the above can occur. C) Speed remains the same (if the medium doesn't change). D) Wavelength remains the same.
A) Diffraction B) Interference C) Refraction D) Reflection
A) Interference B) Reflection C) Refraction D) Diffraction
A) Wavelength B) Frequency C) Polarization D) Amplitude
A) X-ray imaging B) Ultrasound imaging C) Magnetic resonance imaging (MRI) D) Positron emission tomography (PET)
A) Helium B) Alcohol C) Mercury D) Water
A) All of the above B) By carrying information encoded in their frequency C) By reflecting off satellites to relay signals D) By modulating their amplitude to transmit data
A) Water B) Mercury C) Alcohol D) Helium
A) Increases in volume. B) Releases heat to the surroundings. C) Absorbs heat from the surroundings. D) Does not change its temperature.
A) J/kg°C B) J/kg C) °C/kg D) °C
A) Pressure increases the boiling point of water, allowing for higher cooking temperatures. B) Pressure cooker conducts heat more efficiently C) Pressure cooker traps steam, increasing the humidity and cooking speed. D) Pressure decreases the boiling point of water, leading to faster boiling.
A) The effect depends on the amount of salt added. B) It decreases the boiling point. C) It has no effect on the boiling point. D) It increases the boiling point.
A) Sublimation only occurs for solids, while evaporation occurs for liquids. B) Sublimation involves a direct change from solid to gas, while evaporation involves a liquid phase. C) Sublimation occurs at a specific temperature, while evaporation can occur at any temperature. D) Sublimation is a much faster process than evaporation.
A) Sweat reflects sunlight, preventing the body from absorbing heat. B) Sweat increases the humidity around the body, making it feel cooler. C) Sweat insulates the body, preventing heat loss. D) As sweat evaporates, it absorbs heat from the skin, lowering its temperature.
A) Increasing pressure increases the melting point. B) Pressure has no effect on the melting point. C) The relationship depends on the specific substance. D) Increasing pressure decreases the melting point.
A) By measuring the change in temperature during boiling. B) By measuring the time taken for a specific mass to boil. C) By observing the change in state from liquid to gas. D) All of the above
A) Frequency (remains constant) B) Speed (increases) C) Wavelength (increases) D) All of the above
A) Both pure substances and mixtures have a single, sharp melting point. B) Pure substances have a single, sharp melting point, while mixtures have a range of melting points. C) Mixtures have a single, sharp melting point, while pure substances have a range of melting points. D) Both pure substances and mixtures have a range of melting points.
A) Constructive interference weakens the resulting wave, while destructive interference strengthens it. B) Constructive interference strengthens the resulting wave, while destructive interference weakens it. C) Constructive interference increases the frequency, while destructive interference decreases it. D) d) Constructive interference increases the wavelength, while destructive interference
A) Longitudinal wave B) Sound wave C) Electromagnetic wave D) Transverse wave
A) Wavelength B) Amplitude C) Frequency D) Polarization
A) Specific latent heat of vaporization B) All of the above C) Mass of the liquid D) Initial temperature of the liquid
A) Absorbs heat from the surroundings. B) Releases heat to the surroundings. C) Does not change its temperature. D) Decreases in volume.
A) Pressure increases the internal energy of the ice, making it easier to melt. B) Pressure has no effect on the melting point of ice. C) Pressure lowers the boiling point of water, which affects the melting point of ice. D) Pressure disrupts the hydrogen bonding in ice, lowering its melting point.
A) Antifreeze absorbs heat from the engine, preventing it from freezing. B) Antifreeze lowers the freezing point of the coolant mixture. C) Antifreeze increases the boiling point of the coolant mixture. D) Antifreeze improves the thermal conductivity of the coolant.
A) The relationship depends on the specific substance. B) Not related to its boiling point. C) Inversely proportional to its boiling point. D) Directly proportional to its boiling point.
A) It amplifies radio waves to increase their strength. B) It reflects radio waves to change their direction. C) It converts electrical signals into radio waves and vice versa. D) It filters radio waves to select specific frequencies. |