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