Matter In Our Surroundings (IX)
States of matter, phase changes, intermolecular forces, and physical properties of substances
Questions
Which of the following substances has the highest inter-molecular force of attraction?
- Petroleum
- Nitrogen
- Glass
- Hydrogen
- Honey
Which of the following statements is/are correct?
a. Gases cannot be compressed.
b. The melting and boiling points of solids are above room temperature.
c. A liquid has an indefinite volume and shape.
- a only
- b only
- c only
- a and b
- a, b and c
Which of the following pairs will not exhibit diffusion?
- Hydrogen-Oxygen
- Oxygen-Water
- Salt crystals-Water
- Salt crystals-Sand
- Nitrogen-Helium
Neon signs and fluorescent tubes glow because of the presence of
- high density gases
- high voltage elctricity
- high temperatures
- charged particles
- diffusion of gases with electric current
Which of the following statements is/are correct?
a. A solid that is formed directly from a gas is called a sublimate.
b. The phenomenon by which wax melts in the hot sun is called sublimation.
c. Boiling point of a substance is the temperature where the liquid and vapour states can exist together.
- a only
- b only
- c only
- a and b
- a and c
Which of the following will be the effect of decrease of pressure on solid carbon dioxide?
- It will freeze.
- It will turn gaseous.
- It will liquify.
- Its particles will get charged.
- Its density will increase.
Which of the following is the SI unit of temperature?
- Pascal
- Kelvin
- Centigrade
- Candela
- Ampere
Evaporation of a material takes place when it is
- below its melting point
- above its melting point
- at its boiling point
- above its boiling point
- below its boiling point
Which of the following has the highest density?
- Alcohol
- Water
- Petroleum
- Glycerine
- Ice
Which of the following statements is/are incorrect?
a. Particles of matter are always in a state of motion.
b. Melting point of ice is 0oC.
c. Light can be considered as matter.
- a only
- b only
- c only
- a and b
- a and c
Which of the following solids show the process of sublimation?
a. Iodine
b. Camphor
c. Wax
- a, b and c
- a and b
- a and c
- b and c
- only c
Which of the following statements is/are correct?
a. Ghee has a higher melting point than mustard oil.
b. Melting point of a liquid increases with pressure.
c. Higher the inetrmolecular forces, higher the melting point.
- a only
- b only
- c only
- a and b
- a and c
Which of the following statements is/are correct?
a. Latent heat of vapourisation is the heat energy required to change 1 kg of a liquid to gas at atmospheric pressure at its boiling point.
b. Latent heat of vapourisation causes cooling.
c. Evaporation is a bulk phenomenon that afects the latent heat of vapourisation.
- a only
- b only
- c only
- a and b
- a and c
Which of the following parameters determine the physical state of matter?
a. Temperature
b. Pressure
c. Density
- a, b and c
- a and b
- a and c
- b and c
- only b
The particles of which of the following are ionised?
a. Solids
b. Liquids
c. Gases
d. Plasma
- a and b
- b and c
- c and d
- only c
- only d