CBSE Class 9 Science Is Matter Around us Pure MCQs Set D

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

Answer: c  

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

Answer : A

Question: 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 

Answer: B

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

Answer : D

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

Answer : C

Question: 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 

Answer : B

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

Answer : C

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

Answer : B

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

Answer : B

Question: 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 solutio 

Answer : B

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

Answer : C

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

Answer : D

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

Answer : C

Question: 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 

Answer: A

Question: 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

Answer: A

Question: 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

Answer: B

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

Answer: A

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

Answer: D 

Question: 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

Answer: A

Question: 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

Answer: A

Question: 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

Answer: B

Question: 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

Answer: A

More Questions.......................... 

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

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

Answer: A

Question: 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

Answer: B

Question: 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

Answer: A

Question: 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

Answer: 

Question: 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

Answer: A

Question: 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

Answer: C

Question: 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

Answer: A

Question: 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

Answer: B

Question: 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

Answer: – A 

Question: 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

Answer: A 

Question: 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

Answer: 

Question: 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

Answer: A 

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

Answer: A

Question: 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

Answer: A

Question: 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

Answer: B

Question: 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

Answer: A

Question: 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

Answer: A