A) It is associated with a change in temperature. B) It is a measure of the intensity of heat. C) It depends on the mass of the substance. D) It is the amount of heat absorbed or released during a change of state.
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) 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) 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) Total amount of heat absorbed during vaporization. B) Change in temperature when the substance vaporizes. C) Amount of heat required to vaporize 1 kg of the substance. D) Time taken for the substance to vaporize completely.
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 volume change during melting. D) By measuring the amount of heat absorbed to melt a known mass.
A) The relationship depends on the specific substance. B) They are always equal. C) The specific latent heat of fusion is always greater. D) The specific latent heat of vaporization 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) Increasing pressure decreases the boiling point. B) Increasing pressure increases the boiling point. C) Pressure has no effect on the boiling point. D) The effect depends on the specific liquid.
A) Evaporation is a slower process than boiling. B) Boiling occurs only at the boiling point, while evaporation can occur at any temperature. C) Both involve a change of state from liquid to gas. D) a) Evaporation occurs only at the boiling point, while boiling 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 starts to melt. C) The temperature at which the substance changes from a gas to a liquid. D) The temperature at which the substance is completely liquid.
A) By measuring the time taken for a specific mass to melt. B) By measuring the change in temperature during melting. C) By observing the change in state from solid to liquid. D) By measuring the volume change
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 amount of heat absorbed to melt a known mass. D) All of the above
A) Change in volume B) Change in temperature C) None of the above 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) Time taken for vaporization C) Change in temperature (boiling point) D) None of the above
A) Pressure and temperature B) None of the above C) Mass of the substance and type of container D) Both (a) and (b)
A) To prevent heat loss to the surroundings. B) All of the above. C) To maintain a constant temperature. D) To ensure accurate measurement of heat absorbed.
A) Diffraction of waves B) Refraction of waves C) Reflection of waves D) All of the above
A) Mechanical, electromagnetic, and sound B) Water, sound, and light C) Both (a) and (b) D) Transverse, longitudinal, and stationary
A) Displacement, velocity, and acceleration B) Wavelength, frequency, and speed C) Pressure, temperature, and volume D) Amplitude, intensity, and energy
A) Wavelength B) Amplitude C) Frequency D) Speed
A) Wavelength remains the same. B) All of the above can occur. C) Frequency remains the same. D) Speed remains the same (if the medium doesn't change).
A) Reflection B) Refraction C) Interference D) Diffraction
A) Diffraction B) Interference C) Reflection D) Refraction
A) Polarization B) Amplitude C) Wavelength D) Frequency
A) Ultrasound imaging B) Magnetic resonance imaging (MRI) C) Positron emission tomography (PET) D) X-ray imaging
A) Mercury B) Helium C) Alcohol D) Water
A) By carrying information encoded in their frequency B) All of the above C) By reflecting off satellites to relay signals D) By modulating their amplitude to transmit data
A) Water B) Mercury C) Helium D) Alcohol
A) Increases in volume. B) Absorbs heat from the surroundings. C) Does not change its temperature. D) Releases heat to the surroundings.
A) J/kg°C B) °C/kg C) °C D) J/kg
A) Pressure increases the boiling point of water, allowing for higher cooking temperatures. B) Pressure cooker traps steam, increasing the humidity and cooking speed. C) Pressure cooker conducts heat more efficiently 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 has no effect on the boiling point. D) It increases 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 occurs at a specific temperature, while evaporation can occur at any temperature. D) Sublimation is a much faster process than evaporation.
A) Sweat reflects sunlight, preventing the body from absorbing heat. B) Sweat insulates the body, preventing heat loss. C) As sweat evaporates, it absorbs heat from the skin, lowering its temperature. D) Sweat increases the humidity around the body, making it feel cooler.
A) Pressure has no effect on the melting point. B) The relationship depends on the specific substance. C) Increasing pressure increases the melting point. D) Increasing pressure decreases the melting point.
A) By measuring the change in temperature during boiling. B) By measuring the time taken for a specific mass to boil. C) By observing the change in state from liquid to gas. D) All of the above
A) All of the above B) Frequency (remains constant) C) Wavelength (increases) D) Speed (increases)
A) Both pure substances and mixtures have a single, sharp melting point. B) Pure substances have a single, sharp melting point, while mixtures have a range of melting points. 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) d) Constructive interference increases the wavelength, while destructive interference B) Constructive interference increases the frequency, while destructive interference decreases it. C) Constructive interference strengthens the resulting wave, while destructive interference weakens it. D) Constructive interference weakens the resulting wave, while destructive interference strengthens it.
A) Transverse wave B) Longitudinal wave C) Sound wave D) Electromagnetic wave
A) Polarization B) Amplitude C) Frequency D) Wavelength
A) Specific latent heat of vaporization B) Initial temperature of the liquid C) All of the above D) Mass of the liquid
A) Does not change its temperature. B) Absorbs heat from the surroundings. C) Decreases in volume. D) Releases heat to the surroundings.
A) Pressure increases the internal energy of the ice, making it easier to melt. 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 disrupts the hydrogen bonding in ice, lowering its melting point.
A) Antifreeze lowers the freezing point of the coolant mixture. B) Antifreeze increases the boiling point of the coolant mixture. C) Antifreeze absorbs heat from the engine, preventing it from freezing. D) Antifreeze improves the thermal conductivity of the coolant.
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 converts electrical signals into radio waves and vice versa. B) It filters radio waves to select specific frequencies. C) It reflects radio waves to change their direction. D) It amplifies radio waves to increase their strength. |