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