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