A) It is a measure of the intensity of heat. B) It is the amount of heat absorbed or released during a change of state. C) It is associated with a change in temperature. D) It depends on the mass of the substance.
A) Change 1 kg of a liquid to a gas at its boiling 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 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) Total amount of heat absorbed during melting. D) Amount of heat required to melt 1 kg of the substance.
A) Purity B) Mass C) PressureTemperature
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 solid to a liquid at its melting point. D) Change 1 kg of a liquid to a gas at its boiling point.
A) Change in temperature when the substance vaporizes. B) Time taken for the substance to vaporize completely. C) Amount of heat required to vaporize 1 kg of the substance. D) Total amount of heat absorbed during vaporization.
A) By measuring the change in temperature during melting. B) 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 volume change during melting.
A) The specific latent heat of vaporization is always greater. B) They are always equal. C) The specific latent heat of fusion is always greater. D) The relationship depends on the specific substance.
A) Impurities increase the boiling point. B) The effect depends on the specific impurity. C) Impurities have no effect on the boiling point. D) Impurities decrease the boiling point.
A) Pressure has no effect on the boiling point. B) Increasing pressure decreases 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) 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 is completely liquid. C) The temperature at which the substance starts to melt. D) The temperature at which the substance changes from a gas to a liquid.
A) By observing the change in state from solid to liquid. B) By measuring the change in temperature during melting. C) By measuring the time taken for a specific mass to melt. D) By measuring the volume change
A) All of the above 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 time taken for a specific mass to melt.
A) Change in temperature B) Change in volume C) Time taken for melting D) None of the above
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) All of the above D) By measuring the change in temperature during boiling.
A) Change in volume B) None of the above C) Change in temperature (boiling point) D) Time taken for vaporization
A) Pressure and temperature B) None of the above C) Both (a) and (b) D) Mass of the substance and type of container
A) All of the above. B) To prevent heat loss to the surroundings. C) To maintain a constant temperature. D) To ensure accurate measurement of heat absorbed.
A) Reflection of waves B) Diffraction of waves C) All of the above D) Refraction of waves
A) Water, sound, and light B) Transverse, longitudinal, and stationary C) Mechanical, electromagnetic, and sound D) Both (a) and (b)
A) Amplitude, intensity, and energy B) Displacement, velocity, and acceleration C) Pressure, temperature, and volume D) Wavelength, frequency, and speed
A) Wavelength B) Frequency C) Speed D) Amplitude
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) Diffraction B) Reflection C) Interference D) Refraction
A) Refraction B) Diffraction C) Interference D) Reflection
A) Frequency B) Polarization C) Amplitude D) Wavelength
A) Ultrasound imaging B) Magnetic resonance imaging (MRI) C) X-ray imaging D) Positron emission tomography (PET)
A) Helium B) Mercury C) Alcohol 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) Water B) Alcohol C) Mercury D) Helium
A) Increases in volume. B) Does not change its temperature. C) Releases heat to the surroundings. D) Absorbs heat from the surroundings.
A) °C B) °C/kg C) J/kg D) J/kg°C
A) Pressure cooker traps steam, increasing the humidity and cooking speed. B) Pressure cooker conducts heat more efficiently C) Pressure decreases the boiling point of water, leading to faster boiling. D) Pressure increases the boiling point of water, allowing for higher cooking temperatures.
A) It has no effect on the boiling point. B) It decreases the boiling point. C) It increases the boiling point. D) The effect depends on the amount of salt added.
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 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) Pressure has no effect on the melting point. B) Increasing pressure increases the melting point. C) Increasing pressure decreases 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) By measuring the change in temperature during boiling. D) All of the above
A) Frequency (remains constant) B) All of the above C) Speed (increases) D) Wavelength (increases)
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 range of melting points. C) Both pure substances and mixtures have a single, sharp melting point. D) Mixtures have a single, sharp melting point, while pure substances have a range of melting points.
A) Constructive interference weakens the resulting wave, while destructive interference strengthens it. B) Constructive interference increases the frequency, while destructive interference decreases it. C) d) Constructive interference increases the wavelength, while destructive interference D) Constructive interference strengthens the resulting wave, while destructive interference weakens it.
A) Longitudinal wave B) Transverse wave C) Sound wave D) Electromagnetic wave
A) Wavelength B) Polarization C) Frequency D) Amplitude
A) All of the above B) Initial temperature of the liquid C) Mass of the liquid D) Specific latent heat of vaporization
A) Decreases in volume. B) Releases heat to the surroundings. C) Absorbs heat from the surroundings. D) Does not change its temperature.
A) Pressure disrupts the hydrogen bonding in ice, lowering its melting point. 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 increases the internal energy of the ice, making it easier to melt.
A) Antifreeze increases the boiling 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 lowers the freezing point of the coolant mixture.
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. |