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