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