The boiling points of diethyl ether, acetone and n-butyl alcohol are 35°C,
56°C and 118°C respectively. Which one of the following correctly represents
their boiling points in kelvin scale?
(a) 306 K, 329 K, 391 K
(b) 308 K, 329 K, 392 K
(c) 308 K, 329 K, 391 K
(d) 329 K, 392 K, 308 K
Choose the correct statement of the following
(a) conversion of solid into vapours without passing through the liquid
state is called sublimation.
(b) conversion of vapours into solid without passing through the liquid
state is called vapourisation..
(c) conversion of vapours into solid without passing through the liquid
state is called freezing.
(d) conversion of solid into liquid is called sublimation.
On converting 25°C, 38°C and 66°C to kelvin scale, the correct sequence of
temperature will be
(a) 298 K, 311 K and 339 K
(b) 298 K, 300 K and 338 K
(c) 273 K, 278 K and 543 K
(d) 298 K, 310 K and 338 K
A few substances are arranged in the increasing order of ‘forces of attraction’
between their particles. Which one of the following represents a correct
arrangement?
(a) Water, air, wind
(b) Air, sugar, oil
(c) Oxygen, water, sugar
(d) Salt, juice, air
During summer, water kept in an earthen pot becomes cool because of the
phenomenon of
(a) diffusion
(b) transpiration
(c) osmosis
(d) evaporation
The property to flow is unique to fluids. Which one of the following
statements is correct?
(a) Only gases behave like fluids
(b) Gases and solids behave like fluids
(c) Gases and liquids behave like fluids
(d) Only liquids are fluids
. Seema visited a Natural Gas Compressing Unit and found that the gas can
be liquefied under specific conditions of temperature and pressure. While
sharing her experience with friends she got confused. Help her to identify
the correct set of conditions
(a) Low temperature, low pressure
(b) High temperature, low pressure
(c) Low temperature, high pressure
(d) High temperature, high pressure
Which one of the following sets of phenomena would increase on raising
the temperature?
(a) Diffusion, evaporation, compression of gases
(b) Evaporation, compression of gases, solubility
(c) Evaporation, diffusion, expansion of gases
(d) Evaporation, solubility, diffusion, compression of gases
Write notes on—
(a) Adam’s apple.
(b) Secondary sexual characters.
(c) Sex determination in the unborn baby.
Choose the correct option.
(a) Adolescents should be careful about what they eat, because
(i) proper diet develops their brains.
(ii) proper diet is needed for the rapid growth taking place in their
body.
(iii) adolescents feel hungry all the time.
(iv) taste buds are well developed in teenagers.
(b) Reproductive age in women starts when their
(i) menstruation starts.
(ii) breasts start developing.
(iii) body weight increases.
(iv) height increases.
(c) The right meal for adolescents consists of
(i) chips, noodles, coke.
(ii) chapati, dal, vegetables.
(iii) rice, noodles and burger.
(iv) vegetable cutlets, chips and lemon drink.
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