Science- Matter in Our Surroundings

Particles of a matter are randomly moving in all directions. ✘ Kinetic energy of the particles increases with a rise in temperature ✘ Kinetic energy of the particles of all maters remains the same at a particular temperature. ✘ Particles of matter diffuse into each other on their own. ✔

Latent heat ✘ Lattice energy ✘ Loss of heat ✘ None of these ✔

Materials existing as liquids at room temperature have their melting and boiling points lower than that of room temperature. ✘ The phenomenon involving the transition of a substance from solid to liquid state is called sublimation. ✘ To convert a temperature on the Celsius scale to Kelvin scale, subtract 273 from the given temperature ✘ The density of ice is less than that of water. ✔

Atom ✘ Water ✘ Humidity ✘ Electron ✔

Condensation ✘ Evaporation ✘ Sublimation ✘ None of these ✔

33 Degree C, 56 Degree C and 118 Degree C ✘ 35 Degree C, 56 Degree C and 119 Degree C ✘ 35 Degree C, 56 Degree C and 118 Degree C ✘ 56 Degree , 119 Degree C and 35 Degree C ✔

Diffusion, evaporation, compression of gases ✘ Evaporation, compression of gases, solubility ✘ Evaporation, diffusion, expansion of gases ✘ Evaporation, solubility, diffusion, compression of gases ✔

Rises very slowly ✘ Rises rapidly until steam is produced ✘ First rises and then becomes constant ✘ Does not rise at all ✔

Absorbs some heat ✘ Releases some heat ✘ Neither absorbs nor releases heat ✘ Absorbs exactly 3.34 x 105J/kg of heat ✔

Heat the powder mixture at the base of the test tube using a blue flame throughout. ✘ Heat the iron filings and sulphur mixture in the middle of the test tube using yellow flame throughout. ✘ Heat the powder mixture at the top of the test tube using an orange flame throughout. ✘ Heat the iron filings-sulphur mixture at 3/4 quarters of the test tube using a red flame throughout. ✔