Class 9 Science Chapter 2 Is Matter Around us Pure MCQ Questions with Answer

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Is Matter Around us Pure Class 9 MCQ Questions with Answer

Class 9 Science MCQ with answers are given here to Chapter 2 Is Matter Around us Pure. These MCQs are based on the latest CBSE board syllabus and relate to the latest Class 9 Science syllabus. By Solving these Class 9 MCQs, you will be able to analyze all of the concepts quickly in the Chapter and get ready for the Class 9 Annual exam.

Learn Is Matter Around us Pure Class 9 MCQ with answers pdf free download according to the latest CBSE and NCERT syllabus. Students should prepare for the examination by solving CBSE Class 9 Is Matter Around us Pure MCQ with answers given below.

Question 1. Which of these will form a clear and transparent solution:

a. A
b. B
c. A and B
d. B and D

Question 2. Which of these will exhibit the Tyndall effect?

a. A and D

b. B and C

c. A and B

d. D

Question 3. When a bottle of soda water is opened, carbon dioxide escapes, producing a fizz. This is due to:

a. Decrease in solubility on decreasing temperature

b. Decrease in solubility on increasing temperature

c. Decrease in solubility on decreasing pressure

d. Decrease in solubility on increasing pressure

Question 4. A mixture of oil and water can be separated by:

a. Sublimation

b. Crystallisation

c. Chromatography

d. Separating funnel

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.

Question 5. Which one is the colloidal solution among them?

a. C
b. D
c. B
d. A

Question 6. Different components can be separated from petroleum by:

a. FiltrationA

b. Chromatography

c. Simple distillation

d. Fractional distillation

Question 7. What is the name of the metal which exists in liquid state at room temperature?
(a) Sodium
(b) Potassium
(c) Mercury
(d) Bromine

Question 8. Mixture of two or more metals , or metals and non-metals called as…………
(a) Alloy
(b) Solution
(c) Mixture
(d) Metallic mixture

Question 9. Which of the following represents a chemical change?

a. Extraction of copper from copper pyrites

b. Distillation of water

c. Melting of wax

d. Dissolution of salt in water

Question 10. The sequence of steps for separating a mixture of salt, sand and camphor is:

a. Adding water, filtration, evaporation, sublimation

b. Adding water, filtration, sublimation, evaporation

c. Sublimation, adding water, filtration, evaporation

d. Sublimation, adding water, evaporation, filtration

Question 11. Which of the following is the correct set of apparatus for fractional distillation?

a. Round bottomed flask, thermometer, water condenser and beaker

b. Round bottomed flask, thermometer, air condenser and beaker

c. Round bottomed flask, thermometer, fractionating column, water condenser and flask

d. Round bottomed flask, thermometer, fractionating column, air condenser and flask

Question 12. In the separation of dyes A and B by chromatography, component B has more solubility in the solvent. Which component will rise faster?

a. A

b. B

c. Both at the same speed

d. Separation of dyes is independent of the solubility in solvent

Question 13. 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
(a) a compound
(b) an element
(c) a molecule
(d) a mixture

Question 14. Which of the following methods would you use to separate cream from milk?
(a) Fractional distillation
(b) Distillation
(c) Centrifugation
(d) Filtration

Question 15. How one can separate ammonium chloride from a mixture containing ammonium chloride and sodium chloride?
(a) Precipitation
(b) Sublimation
(c) Chromatography
(d) Cetrifugation

Question 16 . Sol and gel are examples of
(a) Solid-solid colloids
(b) Sol is a solid-liquid colloid and gel is liquid solid colloid
(c) Sol is solid-solid colloid and gel is solid-liquid colloid
(d) Sol is a liquid-solid colloid and gel is a solid-liquid colloid

Question 17 . Which of the following elements is not a metalloid?
(a) Boron
(b) Silicon
(c) Germanium
(d) Tungsten

Question 18 . Centrifugation do not used in………..
(a) Diagnostic laboratories
(b) Separate butter and cream
(c) To separate water and sugar
(d) Used in washing machines

Question 19 . Crystallization method is used to purify………..
(a) Liquid
(b) Gas
(c) Solid
(d) Miscible liquids

Question 20 : In the separation of dyes A and B by chromatography, component B has more solubility in the solvent. Which component will rise faster?

a) B

b) A

c) Both at the same speed

d) Separation of dyes is independent of the solubility in solvent

Question 21 : Which of the following is the correct set of apparatus for fractional distillation?

a) Round bottomed flask, thermometer, fractionating column, water condenser and flask

b) Round bottomed flask, thermometer, water condenser and beaker

c) Round bottomed flask, thermometer, air condenser and beaker

d) Round bottomed flask, thermometer, fractionating column, air condenser and flask

Question 22 . Separation of dyes and black ink using ……………………. Method.
(a) Dissolution
(b) Chromatographic
(c) Sublimation
(d) Suspension

Question 23 . If the amount of solute contained in the solution is less than the saturation level…it called as……………
(a) Saturated solution
(b) Unsaturated solution
(c) Homogenous solution
(d) Heterogeneous solution

Question 24. The component of solution that dissolved in solvent called……………
(a) Solute
(b) Sugar
(c) Solvent
(d) Mixture

Question 25 . If the solution is 400 ml and solvent is 300ml so what is percentage of solute?
(a) 30
(b) 40
(c) 45
(d) 25

Question 26 : 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 form a clear and transparent solution:

• a) A and B
• b) A
• c) B
• d) B and D

Question 27 : The sequence of steps for separating a mixture of salt, sand and camphor is:

• a) Sublimation, adding water, filtration, evaporation
• b) Adding water, filtration, evaporation, sublimation
• c) Adding water, filtration, sublimation, evaporation
• d) Sublimation, adding water, evaporation, filtration

Question 28 : Which of the following represents a chemical change?

• a) Extraction of copper from copper pyrites
• b) Distillation of water
• c) Melting of wax
• d) Dissolution of salt in water

Question 29 : 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?

• a) D
• b) A and D
• c) B and C
• d) A and B

Question 30 : Different components can be separated from petroleum by:

• a) Fractional distillation
• b) FiltrationA
• c) Simple distillation
• d) Chromatography

Question 31 . More than one kind of pure form of matter combines forming………..
(a) Texture
(b) Solution
(c) Mixture
(d) Component

Question 32 . Rusting of an article made up of iron is called
(a) corrosion and it is a physical as well as chemical change
(b) dissolution and it is a physical change
(c) corrosion and it is a chemical change
(d) dissolution and it is a chemical change

Question 33 : 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 one is the colloidal solution among them?

• a) D
• b) C
• c) B
• d) A

Question 34 : A mixture of oil and water can be separated by:

• a) Separating funnel
• b) Sublimation
• c) Crystallisation
• d) Chromatography

Question 35 : When a bottle of soda water is opened, carbon dioxide escapes, producing a fizz. This is due to:

• a) Decrease in solubility on decreasing pressure
• b) Decrease in solubility on decreasing temperature
• c) Decrease in solubility on increasing temperature
• d) Decrease in solubility on increasing pressure

Question 36 . Chromatographic method used to separate
(a) Colors in dye
(b) Drug from blood
(c) Tea powder from factory
(d) Drugs from blood

Question 37 .Which of the following is a compound?
(a) Stainless steel
(b) Bronze
(c) Graphite
(d) Hydrogen sulphide

Question 38 .Camphor can be purified by:
(a) Distillation
(b) Filtration
(c) Sedimentation
(d) Sublimation

Question 39 . Air is ………………….. mixture.
(a) Heterogeneous
(b) Gas
(c) Solid
(d) Homogenous

Question 40. Mercury and bromine are both
(a) liquid at room temperature
(b) solid at room temperature
(c) gases at room temperature
(d) both (a) and (b)

Question 41. Foam is the example of…………
(a) Scattering light
(b) Colloids
(c) Saturated solution
(d) Unsaturated solutions

Question 42 .Salt can be obtained from sea water by:
(a) Filtration
(b) Decantation
(c) Evaporation
(d) Sublimation

Question 43 : An atom is
(a) the smallest particle of matter known
(b) the smallest particle of a gas
(c) thesmallest indivisible particle of an element that can take part in a chemical reaction
(d) radioactive emission

Question 44 : Air is regarded as a mixture because
(a) it pressure may vary
(b) its temperature may change
(c) its volume changes under different conditions
(d) its composition may vary

Question 45 .Which of the following is considered to be a pure substance?
(a) Granite
(b) Sodium chloride
(c) Muddy water
(d) Milk of magnesia

Question 46 .To prepare iron sulphide, by heating a mixture of iron filings and sulphur powder, we should use a:
(a) Copper dish
(b) Watch glass
(c) China dish
(d) Petri dish

Question 47 .One common method used to separate dyes is:
(a) Filtration
(b) Distillation
(c) Chromatography
(d) Conductivity

Question 48 .Magnetism is most beneficial for separating:
(a) Gases and non- metallic liquids
(b) Magnetic solids and solids such as sulfur
(c) Non- metallic solids and solids such as sulfur
(d) Non- magnetic solids from non- magnetic liquids

Question 49 : In the chemical equation,Mg + O2 –→ 2MgO, O2 represents
(a) atoms of oxygen joined together in a molecule
(b) molecules of oxygen
(c) grams of oxygen
(d) mole of oxygen

Question 50 : The chemical formula of a compound does not represent
(a) the total number of atoms in one molecule of the compound
(b) the number of the molecules of the compound
(c) the state of the molecules of the compound
(d) the composition of a molecule of the compound

Question 51 : Which of the following statements about a balanced chemical equation is true ?
(a) mass is conserved
(b) atoms are conserved
(c) mass as well as atoms are conserved
(d) molecules are conserved

Question 52 : Which of the following properties is different for solids, liquids and gases?
(a) movement of molecules
(b) particle size of the substance
(c) mass of the substance
(d) energy exchange

Question 53 : Which of the following is an example of a mixture ?
(a) Sugar
(b) Brass
(c) CO₂
(d) NO₃

Question 54 : Which of the following is not a chemical change ?
(a) rusting of iron
(b) converting water into steam
(c) making curd from milk
(d) heating coal

Question 55 : A chemical equation is a means
(a) of representing chemical and physical properties of reactant molecules
(b) of acquiring instructions for the preparation of a compound
(c) or representing a chemical change by means of symbol and formulas
(d) of showing the kind of elements present in a mixture

Question 56 : In a balanced chemical equation, the reactant side and the product side have the same number of
(a) atoms
(b) molecules
(c) ions
(d) electrons 

Question 57 : 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)
(a) 14 m/s
(b) 16 m/s
(c) 15 m/s
(d) 12 m/s

Question 58 : 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
(a) 2700 m
(b) 900 m
(c) 1800 m
(d) 3600m

Question 59: 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. What is the average velocity of the car in the whole journey?
(a) 18 km/hr
(b) 6 km/hr
(c) 4 km/hr
(d) 12 km/hr

Question 60: Boiling point of 10% aqueous solution of common salt at atmospheric pressure is
(a) 100°C
(b) > 100°C
(c) < 100°C
(d) not possible to predict

Question 61 : The change of state of substance from gas to liquid is called-
(a) melting
(b) boiling
(c) condensation
(d) vaporization 

Question 62 : Area under a velocity-time graph gives
(a) distance travelled by a moving object
(b) acceleration of moving object
(c) retardation of a moving object
(d) time taken by a moving object

Question 63 : If a body is thrown up with an initial velocity u and covers a maximum height of h, then h is equal to
(a) u2/2g
(b) u/2g
(c) 2u2g
(d) None of these

Question 64 : Quantum number value for 2p sub shell are
(a) n = 2, L = 0
(b) n = 2, L = 1
(c) n = 1, L = 0
(d) n = 1, L = 1

Question 65 : Who discovered Neutrons?
(a) Dalton
(b) J J Thomson
(c) Chadwick
(d) Daraday

Question 66 : Principle quantum number describes
(a) size of the orbital
(b) shape of the orbital
(c) spin of the orbital
(d) orientation of the orbital

Question 67 : 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
(a) 3.125 m/s2
(b) 2.75 m/s2
(c) 3.5 m/s2
(d) 3.0 m/s2

Question 68 : 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
(a) 1.3 s
(b) 0.70 s
(c) 5.2 s
(d) 2.6 s

Question 69 : 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.
(a) 2.5 km/hr
(b) 3.5 km/hr
(c) 2.0 km/hr
(d) 3 km/hr

Question 70 : In the separation of dyes A and B by chromatography, component B has more solubility in the solvent: Which component will rise faster?
(a) B
(b) A
(c) Both at the same speed
(d) Separation of dyes is independent of the solubility in solvent

Question 71 : Which of the following is the correct set of apparatus for fractional distillation?
(a) Round bottomed flask, thermometer, fractionating column, water condenser and flask
(b) Round bottomed flask, thermometer, water condenser and beaker
(c) Round bottomed flask, thermometer, air condenser and beaker
(d) Round bottomed flask, thermometer, fractionating column, air condenser and flask

Question 72 : The sequence of steps for separating a mixture of salt, sand and camphor is:
(a) Sublimation, adding water, filtration, evaporation
(b) Adding water, filtration, evaporation, sublimation
(c) Adding water, filtration, sublimation, evaporation
(d) Sublimation, adding water, evaporation, filtration

Question 73 : Who first proposed the atomic theory based on scientific knowledge
(a) John Dalton
(b) Robert Brown
(c) Jones Berzelius
(d) Dmitri Mendeleev

Question 75 . A nuclear particle that has same mass that of a proton, but no electrical charge is
(a) nuclide
(b) electron
(c) proton
(d) isotope

Question 76 : Experimentation with cathode ray led to the discovery of
(a) electron
(b) proton
(c) neutron
(d) nucleus

Question 77 . In the gold foil experiment, most of the particles fired at the foil
(a) bounced back
(b) were absorbed by the foil
(c) passed through the foil
(d) combined at the foil

Question 78 : Anode rays were discovered by
(a) Rutherford
(b) Goldstein
(c) J J Thomson
(d) J. Stoney

Question 79 : 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 one is the colloidal solution among them?
(a) D
(b) C
(c) B
(d) A

Question 80 : A mixture of oil and water can be separated by:
(a) Separating funnel
(b) Sublimation
(c) Crystallisation
(d) Chromatography

Question 81 : When a bottle of soda water is opened, carbon dioxide escapes, producing a fizz: This is due to:
(a) Decrease in solubility on decreasing pressure
(b) Decrease in solubility on decreasing temperature
(c) Decrease in solubility on increasing temperature
(d) Decrease in solubility on increasing pressure

Question 82 : Which of the following represents a chemical change?
(a) Extraction of copper from copper pyrites
(b) Distillation of water
(c) Melting of wax
(d) Dissolution of salt in water

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Question 83 : 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?
(a) D
(b) A and D
(c) B and C
(d) A and B

Question 84 : 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 form a clear and transparent solution: 
(a) A and B
(b) A
(c) B
(d) B and D

Question 85 : Air is …………………: mixture:
(a) Heterogeneous
(b) Gas
(c) Solid
(d) Homogenous

Question 86 : Mercury and bromine are both
(a) liquid at room temperature
(b) solid at room temperature
(c) gases at room temperature
(d) both (a) and (b)

Question 87 : Foam is the example of…………
(a) Scattering light
(b) Colloids
(c) Saturated solution
(d) Unsaturated solutions

Question 88: Different components can be separated from petroleum by:
(a) Fractional distillation
(b) FiltrationA
(c) Simple distillation
(d) Chromatography

Question 89 : More than one kind of pure form of matter combines forming………:
(a) Texture
(b) Solution
(c) Mixture
(d) Component

Question 90 : Rusting of an article made up of iron is called
(a) corrosion and it is a physical as well as chemical change
(b) dissolution and it is a physical change
(c) corrosion and it is a chemical change
(d) dissolution and it is a chemical change

Question 91 : Which of the following is considered to be a pure substance?
(a) Granite
(b) Sodium chloride
(c) Muddy water
(d) Milk of magnesia

Question 92 :To prepare iron sulphide, by heating a mixture of iron filings and sulphur powder, we should use 
(a) Copper dish
(b) Watch glass
(c) China dish
(d) Petri dish

Question 93 : One common method used to separate dyes is:
(a) Filtration
(b) Distillation
(c) Chromatography
(d) Conductivity

Question 94 : Chromatographic method used to separate
(a) Colors in dye
(b) Drug from blood
(c) Tea powder from factory
(d) Drugs from blood

Question 95 : Which of the following is a compound?
(a) Stainless steel
(b) Bronze
(c) Graphite
(d) Hydrogen sulphide

Question 96 : Camphor can be purified by:
(a) Distillation
(b) Filtration
(c) Sedimentation
(d) Sublimation

Question 97 : A mixture of oil and water can be separated by:

(a) Sublimation

(b) Crystallisation

(c) Chromatography

(d) Separating funnel  

Question 98 : Magnetism is most beneficial for separating:
(a) Gases and non- metallic liquids
(b) Magnetic solids and solids such as sulfur
(c) Non- metallic solids and solids such as sulfur
(d) Non- magnetic solids from non- magnetic liquids

Question 99 : Salt can be obtained from sea water by:
(a) Filtration
(b) Decantation
(c) Evaporation
(d) Sublimation

Question 100 : When a bottle of soda water is opened, carbon dioxide escapes, producing a fizz: This is due to:

(a) Decrease in solubility on decreasing temperature

(b) Decrease in solubility on increasing temperature

(c) Decrease in solubility on decreasing pressure

(d) Decrease in solubility on increasing pressure  

Question 101 : The sequence of steps for separating a mixture of salt, sand and camphor is:

(a) Adding water, filtration, evaporation, sublimation

(b) Adding water, filtration, sublimation, evaporation

(c) Sublimation, adding water, filtration, evaporation

(d) Sublimation, adding water, evaporation, filtration

Question 102 : Which of the following is the correct set of apparatus for fractional distillation?

(a) Round bottomed flask, thermometer, water condenser and beaker

(b) Round bottomed flask, thermometer, air condenser and beaker

(c) Round bottomed flask, thermometer, fractionating column, water condenser and flask

(d) Round bottomed flask, thermometer, fractionating column, air condenser and flask

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:

Question 103 : Which one is the colloidal solution among them?

(a) C
(b) D
(c) B
(d) A 

Question 104 : Which of these will form a clear and transparent solution:

(a) A
(b) B
(c) A and B
(d) B and D 

Question 105 : Which of these will exhibit the Tyndall effect?

(a) A and D

(b) B and C

(c) A and B

(d) D Answer

Question 106 : Which of the following represents a chemical change?

(a) Extraction of copper from copper pyrites

(b) Distillation of water

(c) Melting of wax

(d) Dissolution of salt in water 

Question 107 : Which of the following elements is not a metalloid?
(a) Boron
(b) Silicon
(c) Germanium
(d) Tungsten 

Question 108 : Centrifugation do not used in………
(a) Diagnostic laboratories
(b) Separate butter and cream
(c) To separate water and sugar
(d) Used in washing machines 

Question 109 : 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
(a) a compound
(b) an element
(c) a molecule
(d) a mixture 

Question 110 : In the separation of dyes A and B by chromatography, component B has more solubility in the solvent: Which component will rise faster?

(a) A

(b) B

(c) Both at the same speed

(d) Separation of dyes is independent of the solubility in solvent

Question 111 : Different components can be separated from petroleum by:

(a) FiltrationA

(b) Chromatography

(c) Simple distillation

(d) Fractional distillation  

Question 112 : What is the name of the metal which exists in liquid state at room temperature?
(a) Sodium
(b) Potassium
(c) Mercury
(d) Bromine  

Question 113 : Mixture of two or more metals , or metals and non-metals called as…………
(a) Alloy
(b) Solution
(c) Mixture
(d) Metallic mixture  

Question 114 : Sol and gel are examples of
(a) Solid-solid colloids
(b) Sol is a solid-liquid colloid and gel is liquid solid colloid
(c) Sol is solid-solid colloid and gel is solid-liquid colloid
(d) Sol is a liquid-solid colloid and gel is a solid-liquid colloid 

Question 115 : The component of solution that dissolved in solvent called……………
(a) Solute
(b) Sugar
(c) Solvent
(d) Mixture 

Question 116 : If the solution is 400 ml and solvent is 300ml so what is percentage of solute?
(a) 30
(b) 40
(c) 45
(d) 25 

Question 117 : Which of the following methods would you use to separate cream from milk?
(a) Fractional distillation
(b) Distillation
(c) Centrifugation
(d) Filtration 

Question 118 : How one can separate ammonium chloride from a mixture containing ammonium chloride and sodium chloride?
(a) Precipitation
(b) Sublimation
(c) Chromatography
(d) Cetrifugation  

Question 119 : Separation of dyes and black ink using ……………………: Method
(a) Dissolution
(b) Chromatographic
(c) Sublimation
(d) Suspension 

Question 120 : If the amount of solute contained in the solution is less than the saturation level…it called as……………
(a) Saturated solution
(b) Unsaturated solution
(c) Homogenous solution
(d) Heterogeneous solution

Question 121 : Which of the following is not vector quantity?
(a) Retardation
(b) Average speed
(c) Acceleration due to gravity
(d) Displacement

Question 122: If the time-displacement graph of a particle is parallel to the time-axis, then velocity of the particle is
(a) zero
(b) equal to acceleration of the body
(c) unity
(d) infinity

Question 123 : In the velocity-time graph, AB shows that the body has 

(a) initial velocity OA and is moving with uniform retardation
(b) uniform speed
(c) non-uniform retardation
(d) uniform acceleration

Question 124 : Crystallization method is used to purify………
(a) Liquid
(b) Gas
(c) Solid
(d) Miscible liquids 

Question 125 : 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
(a) zero
(b) 25 m/s
(c) 24 m/s
(d) none of these 

Question 126 : If an object covering distances in direct proportion to the square of the time lapsed, then the acceleration is
(a) constant
(b) increasing
(c) decreasing
(d) none of these

Question 127 : Distance travelled by a freely falling body is proportional to
(a) time of fall
(b) square of the time of fall
(c) square of the acceleration due to gravity
(d) mass of the body

Question 128 : The rate of change of displacement with time is
(a) velocity
(b) acceleration
(c) speed
(d) retardation

Question 129 : A stone is dropped into a well in which the level of water is h, below the top of the well. If v is velocity of sound, then time T after which the splash is heard is equal to
(a)

(b)

(c)

(d) None of these

Question 130 : A stone weighing 3 kg falls from the top of a tower 100 m high and buries itself 2 m deep in the sand. The time of penetration is
(a) 0.09 sec
(b) 2.1 sec
(c) 0.9 sec
(d) 1.3 sec

Question 131 : The velocity of a body at any instant is 10 m/s. After 5 sec, velocity of the particle is 20 m/s. The velocity at 3 seconds before is
(a) 6 m/sec
(c) 4 m/sec
(b) 7 m/sec
(d) 8 m/sec

Question 132 : A body covers 200 cm in the first 2 sec.and 220 cm in next 4 sec. What is the velocity of the body at the’ end of 7th second?
(a) 10 cm/sec
(b) 40 cm/sec
(c) 20 cm/sec
(d) 5 cm/sec

Question 133 : In the given velocity-time graph, AB shows that the body has

(a) uniform velocity throughout its motion and has zero initial velocity
(b) none of these
(c) uniform retardation
(d) uniform acceleration

Question 134 : 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 v_A: v_B will be

(a) 3: 1
(b) 1 : 3
(c) 1 : 2
(d) none of these

Question 135 : In the given figure, velocity of the body at A is

(a) zero
(b) maximum
(c) infinite
(d) unity

Question 136 : The velocity-time graph for a body with nonuniform motion is a
(a) straight line parallel to x-axis
(b) curved line
(c) straight line parallel to y-axis
(d) none of these

Question 137 : 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
(a) 2.5 km/hr
(b) 3.5 km/hr
(c) 2.0 km/hr
(d) 3 km/hr

Question 138 : If a ball is thrown up with a certain velocity. It attains a height of 40 m and comes back to the thrower, then
(a) total distance covered by it is zero
(b) total displacement is zero
(c) total displacement covered by it is 80 m
(d) total distance covered by it is 40 m

Question 139 : If a body of mass 0.10 kg is moving on circular path of diameter 1.0 m at the rate of 10 revolutions per 31.4 sec, then centripetal force acting on the body (n = 3.14) is
(a) 0.2 Newton
(b) 0.02 Newton
(c) 2.0 Newton
(d) 20.0 Newton

Question 140 : A phonograph record on turn table rotates at 30 rpm. The linear speed of a point on therecord at the needle at the beginning of the recording when it is at a distance of 14 cm from the centre is
(a) 44 cm/sec
(b) 52 cm/sec
(c) 48 cm/sec
(d) 22 cm/sec

Question 141 : The relationship between average speed, time and distance is
(b) Time = average speed/distance
(c) Distance = average speed × time
(a) Average speed = distance × time
(d) Average speed =total distance / total time

Question 142 : A stone is thrown vertically upward with an initial velocity u from the top of a tower, reaches the ground with a velocity 3u. The height of the tower is
(a) 3 u2/g
(b) 4 u2/g
(c) 9 u2/g
(d) 6 u2/g

Question 143: Acceleration of a body projected upwards with a certain velocity is
(a) – 9.8 m/s2
(b) zero
(c) insufficient data
(d) 9.8 m/s2

Question 144 : The earth’s radius is 6400 km. It makes one revolution about its own axis in 24 hrs. The centripetal acceleration of a point on its equator is nearly
(a) 3.4 cm/s²
(b) 340 cm/s²
(c) 34 cm/s²
(d) 0.34 cm/s²

Question 145 : The acceleration of a point on the rim of flywheel 1 m in diameter, if it makes 1200 revolutions per minute is
(a)

(b)

(c)

(d) none of these

Question 146 : 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 :-
(a) √h₁ : √h₂
(b) h₂/h1
(c) h₂ : h₁
(d) None of these

Question 147 : Name the instrument used to measure instantaneous speed of a vehicle
(a) Speedometer
(b) Multicenter
(c) Accelerator
(d) Ammeter

Question 148 : A ball is dropped on the floor from a height of 10 m. It rebounds to a height of 2.5 m. If the ball is in contact with the floor for 0.01 sec, then average acceleration during contact is :-
(a) 2100 m/s2
(b) 1400 m/s2
(c) 700 m/s2
(d) 400 m/s2

Question 149 : A body moves on three quarters of a circle of radius r. The displacement and distance travelled by it are:-
(a)

(b) displacement = r, distance = 3r
(c)

(d)

Question 150 : 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 :-
(a) √h1 : √h2
(b) h2/h1
(c) h2 : h1
(d) None of these

Question 151 : Name the instrument used to measure instantaneous speed of a vehicle
(a) Speedometer
(b) Multicenter
(c) Accelerator
(d) Ammeter

Question 152 : A ball is dropped on the floor from a height of 10 m. It rebounds to a height of 2.5 m. If the ball is in contact with the floor for 0.01 sec, then average acceleration during contact is :-
(a) 2100 m/s2
(b) 1400 m/s2
(c) 700 m/s2
(d) 400 m/s2

Question 153 : If a ball is thrown up with a certain velocity. It attains a height of 40 m and comes back to the thrower, then
(a) total distance covered by it is zero
(b) total displacement is zero
(c) total displacement covered by it is 80 m     
(d) total distance covered by it is 40 m

Question 154 : A body moving along a circular path has
(a) constant speed
(b) constant velocity
(c) no radial acceleration
(d) no tangential velocity

Question 155 : If a body of mass 0.10 kg is moving on circular path of diameter 1.0 m at the rate of 10 revolutions per 31.4 sec, then centripetal force acting on the body (n = 3.14) is
(a) 0.2 Newton
(b) 0.02 Newton
(c) 2.0 Newton
(d) 20.0 Newton

Question 156 : A phonograph record on turn table rotates at 30 rpm. The linear speed of a point on therecord at the needle at the beginning of the recording when it is at a distance of 14 cm from the centre is
(a) 44 cm/sec
(b) 52 cm/sec
(c) 48 cm/sec
(d) 22 cm/sec

Question 157 : The relationship between average speed, time and distance is
(a) Average speed =total distance / total time
(b) Time = average speed/distance
(c) Distance = average speed × time
(d) Average speed = distance × time

Question 158 : A body moving along a circular path has
(a) no tangential velocity
(b) constant velocity
(c) no radial acceleration      
(d) constant speed

Question 159: A rubber ball dropped from a certain height
(a) non-uniform speed
(b) uniform speed
(c) uniform retardation
(d) uniform acceleration

Question 160 : If the velocity of a body does not change, its acceleration is
(a) zero
(b) unity
(c) infinite
(d) none of these

Question 161 : When the distance an object travels is directly proportional to the length of time, it is said to travel with
(a) constant speed
(b) zero velocity
(c) constant acceleration
(d) uniform velocity

Question 162 : A rubber ball dropped from a certain height
(a) non-uniform speed
(b) uniform speed
(c) uniform retardation
(d) uniform acceleration

Question 163 : If the velocity of a body does not change, its acceleration is
(a) zero
(b) unity
(c) infinite
(d) none of these

Question 164 : When the distance an object travels is directly proportional to the length of time, it is said to travel with
(a) constant speed
(b) zero velocity
(c) constant acceleration
(d) uniform velocity

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