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