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