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