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