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