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