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