GENERAL SCIENCE #28
MULTIPLE CHOICE QUESTIONS
1. Which
of the following 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
Answer:
(c)
2. Nandita
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
Answer:
(c)
3. The
property of 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
Answer:
(c)
4. During
summer, water kept in an earthen pot becomes cool because of the phenomenon of
which of the following?
(a) Diffusion
(b) Transpiration
(c) Osmosis
(d) Evaporation
Answer:
(d)
5. 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
Answer:
(c)
6. Which
of the following will be the correct sequence of temperature on converting
25°C, 38°C and 66°C to Kelvin scale?
(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
Answer:
(a)
7. Which
of the following statement is correct?
(a) Conversion of solid into vapour without passing
through the liquid state is called vaporisation.
(b) Conversion of vapour into solid without passing
through the liquid state is called sublimation.
(c) Conversion of vapour into solid without passing
through the liquid state is called freezing.
(d) Conversion of solid into liquid is called
sublimation.
Answer:
(b)
8. 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 and 391 K
(b) 308 K, 329 K and 392 K
(c) 308 K, 329 K and 391 K
(d) 329 K, 392 K and 308 K
Answer:
(c)
9. Which
of the following conditions will increase the evaporation of water?
(a) Increase in temperature of water
(b) Decrease in temperature of water
(c) Less exposed surface area of water
(d) Adding common salt to water
Answer:
(a)
10. What
is the boiling point of water at sea level?
(a) 0°C
(b) 273 K
(c) 373 K
(d) 273°C
Answer:
(c)
11. Which
of the following has the strongest interparticle forces at room temperature?
(a) Oxygen
(b) Water
(c) Bromine
(d) Iron
Answer:
(d)
12. Which
of the following conditions is most favourable for converting a gas into a
liquid?
(a) High pressure, low temperature
(b) Low pressure, low temperature
(c) Low pressure, high temperature
(d) High pressure, high temperature
Answer:
(a)
13. Dry
ice is ……………
(a) water in solid state
(b) water in gaseous state
(c) CO2 in liquid state
(d) CO2 in solid state
Answer:
(d)
14. What
is called the phenomenon of change of a liquid into the gaseous state at any
temperature below its boiling point?
(a) Evaporation
(b) Diffusion
(c) Transpiration
(d) Osmosis
Answer:
(a)
15. When
a gas jar full of air is placed upside down on a gas jar full of bromine
vapours, the red-brown vapours of bromine from the lower jar go upward into the
jar containing air. In this experiment
……………
(a) air is heavier than bromine
(b) both air and bromine have the same density
(c) bromine is heavier than air
(d) bromine cannot be heavier than air because it is
going upwards against gravity
Answer:
(c)
16. Which
one of the following statements is not true?
(a) The molecules in a solid vibrate about a fixed
position
(b) The molecules in a liquid are arranged in a regular
pattern
(c) The molecules in a gas exert negligibly small forces
on each other, except during collisions
(d) The molecules of a gas occupy all the space available
Answer:
(b)
17. What
is the correct procedure of heating iron-sulphur mixture to prepare iron
sulphide?
(a) Heat the powder mixture at the base of the test tube
using a blue flame throughout
(b) Heat the iron filings and sulphur mixture in the
middle of the test tube using yellow flame throughout
(c) Heat the powder mixture at the top of the test tube
using an orange flame throughout
(d) Heat the iron filings-sulphur mixture at 3/4 quarters
of the test tube using a red flame throughout
Answer:
(a)
18. Which
of the following cannot be considered a form of matter?
(a) Atom
(b) Water
(c) Humidity
(d) Electron
Answer:
(c)
19. Which
of the following causes the temperature of a substance to remain constant while
it is undergoing a change in its state?
(a) Latent heat
(b) Lattice energy
(c) Loss of heat
(d) None of the above
Answer:
(a)
20. Which
of the following statement is not true regarding the characteristic of matter?
(a) Particles of a matter are randomly moving in all
directions
(b) Kinetic energy of the particles increases with a rise
in temperature
(c) Kinetic energy of the particles of all maters remains
the same at a particular temperature
(d) Particles of matter diffuse into each other on their
own
Answer:
(c)
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