Is matter around us pure? MCQs with Answers

Question-1. When a bottle of soda water is opened, carbon dioxide escapes, producing a fizz. This is due to

1. Decrease in solubility on decreasing temperature
2. Decrease in solubility on increasing temperature
3. Decrease in solubility on decreasing pressure
4. Decrease in solubility on increasing pressure

Question-2. When the distance an object travels is directly proportional to the length of time, it is said to travel with

1. constant speed
2. zero velocity
3. constant acceleration
4. uniform velocity

Question-3. Which of the following elements is not a metalloid?

1. Boron
2. Silicon
3. Germanium
4. Tungsten

Question-4. Which of the following is an example of a mixture ?

1. Sugar
2. Brass
3. CO2
4. NO3

Question-5. Which of the following is not a chemical change ?

1. rusting of iron
2. converting water into steam
3. making curd from milk
4. heating coal

Question-6. Which of the following is not vector quantity?

1. Retardation
2. Average speed
3. Acceleration due to gravity
4. Displacement

Question-7. Which of the following is the correct set of apparatus for fractional distillation?

1. Round bottomed flask, thermometer, water condenser and beaker
2. Round bottomed flask, thermometer, air condenser and beaker
3. Round bottomed flask, thermometer, fractionating column, water condenser and flask
4. Round bottomed flask, thermometer, fractionating column, air condenser and flask

Question-8. Which of the following methods would you use to separate cream from milk?

1. Fractional distillation
2. Distillation
3. Centrifugation
4. Filtration

Question-9. Which of the following properties is different for solids, liquids and gases?

1. movement of molecules
2. particle size of the substance
3. mass of the substance
4. energy exchange

Question-10. Which of the following represents a chemical change?

1. Extraction of copper from copper pyrites
2. Distillation of water
3. Melting of wax
4. Dissolution of salt in water

Question-11. Which of the following statements about a balanced chemical equation is true ?

1. mass is conserved
2. atoms are conserved
3. mass as well as atoms are conserved
4. molecules are conserved

Question-12. Which of these will exhibit the Tyndall effect?

1. A and D
2. B and C
3. A and B
4. D

Question-13. Which of these will form a clear and transparent solution

1. A
2. B
3. A and B
4. B and D

Question-14. Which one is the colloidal solution among them?

1. C
2. D
3. B
4. A

Question-15. Who discovered Neutrons?

1. Dalton
2. J J Thomson
3. Chadwick
4. Daraday

Question-16. Who first proposed the atomic theory based on scientific knowledge

1. John Dalton
2. Robert Brown
3. Jones Berzelius
4. Dmitri Mendeleev

Question-17. Camphor can be purified by

1. Distillation
2. Filtration
3. Sedimentation
4. Sublimation

Question-18. Magnetism is most beneficial for separating

1. Gases and non- metallic liquids
2. Magnetic solids and solids such as sulfur
3. Non- metallic solids and solids such as sulfur
4. Non- magnetic solids from non- magnetic liquids

Question-19. One common method used to separate dyes is

1. Filtration
2. Distillation
3. Chromatography
4. Conductivity

Question-20. Salt can be obtained from sea water by

1. Filtration
2. Decantation
3. Evaporation
4. Sublimation

Question-21. To prepare iron sulphide, by heating a mixture of iron filings and sulphur powder, we should use

1. Copper dish
2. Watch glass
3. China dish
4. Petri dish

Question-22. Which of the following is a compound?

1. Stainless steel
2. Bronze
3. Graphite
4. Hydrogen sulphide

Question-23. Which of the following is considered to be a pure substance?

1. Granite
2. Sodium chloride
3. Muddy water
4. Milk of magnesia

Question-24. A body goes from A to B with a velocity of 20 m/s and comes back B to A with a velocity of 30 m/s. The average velocity of the body during the whole journey is

1. zero
2. 25 m/s
3. 24 m/s
4. none of these

Question-25. A body is thrown vertically upwards and rises to a height of 10m. The velocity with which the body was thrown upwards is (g = 9.8 m/s2)

1. 14 m/s
2. 16 m/s
3. 15 m/s
4. 12 m/s

Question-26. A body moving along a circular path has

1. no tangential velocity
2. constant velocity
3. no radial acceleration
4. constant speed

Question-27. A chemical equation is a means

1. of representing chemical and physical properties of reactant molecules
2. of acquiring instructions for the preparation of a compound
3. or representing a chemical change by means of symbol and formulas
4. of showing the kind of elements present in a mixture

Question-28. A mixture of oil and water can be separated by

1. Sublimation
2. Crystallisation
3. Chromatography
4. Separating funnel

Question-29. A motor ship covers the distance of 300 km between two localities on a river in 10 hrs downstream and in 12 hrs upstream. Find the flow velocity of the river assuming that these velocities are constant.

1. 2.5 km/hr
2. 3.5 km/hr
3. 2.0 km/hr
4. 3 km/hr

Question-30. A nuclear particle that has same mass that of a proton, but no electrical charge is

1. nuclide
2. electron
3. proton
4. isotope

Question-31. A pure substance which is made up of only one kind of atom and cannot be broken into two or more simpler substances by physical or chemical means is referred to as

1. a compound
2. an element
3. a molecule
4. a mixture

Question-32. A rubber ball dropped from a certain height

1. non-uniform speed
2. uniform speed
3. uniform retardation
4. uniform acceleration

Question-33. A truck running along a straight line increases its speed uniformly from 30 m/s to 60 m/s over a time interval 1 min. The distance travelled during this time interval is

1. 2700 m
2. 900 m
3. 1800 m
4. 3600m

Question-34. Air is regarded as a mixture because

1. it pressure may vary
2. its temperature may change
3. its volume changes under different conditions
4. its composition may vary

Question-35. Air is…................mixture.

1. Heterogeneous
2. Gas
3. Solid
4. Homogenous

Question-36. An atom is

1. the smallest particle of matter known
2. the smallest particle of a gas
3. thesmallest indivisible particle of an element that can take part in a chemical reaction
4. radioactive emission

Question-37. Anode rays were discovered by

1. Rutherford
2. Goldstein
3. J J Thomson
4. J. Stoney

Question-38. Area under a velocity-time graph gives

1. distance travelled by a moving object
2. acceleration of moving object
3. retardation of a moving object
4. time taken by a moving object

Question-39. Boiling point of 10% aqueous solution of common salt at atmospheric pressure is

1. 100°C
2. > 100°C
3. < 100°C
4. not possible to predict

Question-40. Camphor can be purified by:

1. Distillation
2. Filtration
3. Sedimentation
4. Sublimation

Question-41. car travels 1/3 rd distance on a straight road with a velocity of 10 km/hr, nextb1/3 rd with velocity 20 km/hr and the last 1/3 rd with velocity 60 km/hr

1. 18 km/hr
2. 6 km/hr
3. 4 km/hr
4. 12 km/hr

Question-42. Centrifugation do not used in

1. Diagnostic laboratories
2. Separate butter and cream
3. To separate water and sugar
4. Used in washing machines

Question-43. Chromatographic method used to separate

1. Colors in dye
2. Drug from blood
3. Tea powder from factory
4. Drugs from blood

Question-44. Crystallization method is used to purify…................

1. Liquid
2. Gas
3. Solid
4. Miscible liquids

Question-45. Different components can be separated from petroleum by

1. Filtration
2. Chromatography
3. Simple distillation
4. Fractional distillation

Question-46. Distance of the moon from the earth is 4 × 108 m. The time taken by a radar signalmn transmitted from the earth to reach the moon is

1. 1.3 s
2. 0.70 s
3. 5.2 s
4. 2.6 s

Question-47. Distance travelled by a freely falling body is proportional to

1. time of fall
2. square of the time of fall
3. square of the acceleration due to gravity
4. mass of the body

Question-48. Driver of a train travelling at 115 km/hr sees on a same track, 100m infront of him, a slow train travelling in the same direction at 25 km/ hr. The least retardation that must be applied to faster train to avoid a collision is

1. 3.125 m/s2
2. 2.75 m/s2
3. 3.5 m/s2
4. 3.0 m/s2

Question-49. Experimentation with cathode ray led to the discovery of

1. electron
2. proton
3. neutron
4. nucleus

Question-50. Foam is the example of

1. Scattering light
2. Colloids
3. Saturated solution
4. Unsaturated solutions

Question-51. Four samples A, B, C, D are prepared by adding a pinch of copper sulphate, a spatula of copper sulphate, a spatula of chalk powder, and some milk, to water respectively:Which of these will exhibit the Tyndall effect?

1. D
2. A and D
3. B and C
4. A and B

Question-52. How one can separate ammonium chloride from a mixture containing ammonium chloride and sodium chloride?

1. Precipitation
2. Sublimation
3. Chromatography
4. Cetrifugation

Question-53. If a body is thrown up with an initial velocity u and covers a maximum height of h, then h is equal to

1. u2/2g
2. u/2g
3. 2u2g
4. None of these

Question-54. If the amount of solute contained in the solution is less than the saturation level?it called as?????

1. Saturated solution
2. Unsaturated solution
3. Homogenous solution
4. Heterogeneous solutio

Question-55. If the displacement-time graph for the two particles A and B are straight lines inclined at angles of 30° and 60° with the time axis, then ratio of the velocities vA: vB will be

1. 3: 1
2. 1 : 3
3. 1 : 2
4. none of these

Question-56. If the solution is 400 ml and solvent is 300ml so what is percentage of solute?

1. 30
2. 40
3. 45
4. 25

Question-57. If the time-displacement graph of a particle is parallel to the time-axis, then velocity of the particle is

1. zero
2. equal to acceleration of the body
3. unity
4. infinity

Question-58. If the velocity of a body does not change, its acceleration is

1. zero
2. unity
3. infinite
4. none of these

Question-59. If two bodies of different masses m1 and m2 are dropped from different heights h1 and h2, then ratio of the times taken by the two to drop through these distances is :-

1. vh1 : vh2
2. h2/h1
3. h2 : h1
4. None of these

Question-60. In a balanced chemical equation, the reactant side and the product side have the same number of

1. atoms
2. molecules
3. ions
4. electrons

Question-61. In the given figure, velocity of the body at A is

1. zero
2. maximum
3. infinite
4. unity

Question-62. In the given velocity-time graph, AB shows that the body has

1. uniform velocity throughout its motion and has zero initial velocity
2. none of these
3. uniform retardation
4. uniform acceleration

Question-63. In the gold foil experiment, most of the particles fired at the foil

1. bounced back
2. were absorbed by the foil
3. passed through the foil
4. combined at the foil

Question-64. In the separation of dyes A and B by chromatography, component B has more solubility in the solvent. Which component will rise faster?

1. A
2. B
3. Both at the same speed
4. Separation of dyes is independent of the solubility in solvent

Question-65. In the velocity-time graph, AB shows that the body has

1. initial velocity OA and is moving with uniform retardation
2. uniform speed
3. non-uniform retardation
4. uniform acceleration

Question-66. Mercury and bromine are both

1. liquid at room temperature
2. solid at room temperature
3. gases at room temperature
4. both (A&B)

Question-67. Mixture of two or more metals , or metals and non-metals called as

1. Alloy
2. Solution
3. Mixture
4. Metallic mixture

Question-68. More than one kind of pure form of matter combines forming

1. Texture
2. Solution
3. Mixture
4. Component

Question-69. Name the instrument used to measure instantaneous speed of a vehicle

1. Speedometer
2. Multicenter
3. Accelerator
4. Ammeter

Question-70. Principle quantum number describes

1. size of the orbital
2. shape of the orbital
3. spin of the orbital
4. orientation of the orbital

Question-71. Quantum number value for 2p sub shell are

1. n = 2, L = 0
2. n = 2, L = 1
3. n = 1, L = 0
4. n = 1, L = 1

Question-72. Rusting of an article made up of iron is called

1. corrosion and it is a physical as well as chemical change
2. dissolution and it is a physical change
3. corrosion and it is a chemical change
4. dissolution and it is a chemical change

Question-73. Sol and gel are examples of

1. Solid-solid colloids
2. Sol is a solid-liquid colloid and gel is liquid solid colloid
3. Sol is solid-solid colloid and gel is solid-liquid colloid
4. Sol is a liquid-solid colloid and gel is a solid-liquid colloid

Question-74. The chemical formula of a compound does not represent

1. the total number of atoms in one molecule of the compound
2. the number of the molecules of the compound
3. the state of the molecules of the compound
4. the composition of a molecule of the compound

Question-75. The component of solution that dissolved in solvent called

1. Solute
2. Sugar
3. Solvent
4. Mixture

Question-76. The rate of change of displacement with time is

1. velocity
2. acceleration
3. speed
4. retardation

Question-77. The relationship between average speed, time and distance is

1. Time = average speed/distance
2. Distance = average speed × time
3. Average speed = distance × time
4. Average speed =total distance / total time

Question-78. The sequence of steps for separating a mixture of salt, sand and camphor is

1. Adding water, filtration, evaporation, sublimation
2. Adding water, filtration, sublimation, evaporation
3. Sublimation, adding water, filtration, evaporation
4. Sublimation, adding water, evaporation, filtration

Question-79. The velocity-time graph for a body with nonuniform motion is a

1. straight line parallel to x-axis
2. curved line
3. straight line parallel to y-axis
4. none of these

Question-80. What is the name of the metal which exists in liquid state at room temperature?

1. Sodium
2. Potassium
3. Mercury
4. Bromine