CBSE class 9 Science Quiz | CBSE class 9 Science Objective Type Questions with Answers

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Questions
121 The equation v = u + at gives information as
A velocity is a function of time.
B Position is function of velocity and time.
C velocity is a function of position.
D Position is a function of time.

Answer: velocity is a function of time.
122 Which of the following can determine the acceleration of a moving object?
A slope of the distance time-graph
B area of velocity-time graph
C slope of velocity-time graph
D area of distance-time graph

Answer: slope of velocity-time graph
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123 A body is projected up with an initial velocity u m/s. It goes up to a height h metres in t seconds time. Then it comes back at the point of projection. Considering negligible air resistance, which of the following statement is true?
A the displacement is zero
B the average velocity is 2h/t
C the acceleration is zero
D the final velocity is 2u when body reaches projection point.

Answer: the displacement is zero
124 One newton is the force ____________
A which gives a 1 kg body an acceleration of 1m/s2
B which gives a 1 g body an acceleration of 1 cm/s2
C of gravity on a 1 kg body
D of gravity on a 1 g body

Answer: which gives a 1 kg body an acceleration of 1m/s2
125 When a bus starts suddenly from rest, the passengers sitting inside the bus move backwards. This illustrates an example of
A Newtons Third Law of Motion
B Newton First Law of Motion
C Newton Second Law of Motion
D None of these

Answer: Newton First Law of Motion
126 Acceleration acts always in the direction __________
A of the net force
B of the final velocity
C of the displacement
D of the initial velocity

Answer: of the net force
127 The acceleration produced in a body by an acting force of given magnitude depends upon _____.
A mass of the body
B shape of the body
C size of the body
D all of these

Answer: mass of the body
128 A ball is moving in a circle at fixed speed. Which of the following statement is TRUE?
A There is no acceleration present.
B There must be only one force acting on it.
C Acceleration is present but has constant magnitude.
D Acceleration is present and acts tangent to the circle.

Answer: Acceleration is present but has constant magnitude.
129 Action and reaction act on
A same body and in same direction
B different bodies but in opposite directions
C same body but in opposite directions
D different bodies but in same direction

Answer: different bodies but in opposite directions
130 The relative density ___________
A is unitless
B has unit of kg/m2
C has unit of kg/m3
D has unit of g/cm3

Answer: is unitless
131 The time of ascent when measured from the point of projection of a body projected upwards, the
A Time of ascent = Time of descent
B Time of ascent < Time of descent
C Time of ascent > Time of descent
D All of these

Answer: Time of ascent = Time of descent
132 Weight of an object on the surface of the moon is
A 1/6 that on the surface of the earth
B ½ that on the surface of the earth
C 1/5 th that on the surface of the earth
D 1/3 that on the surface of the earth

Answer: 1/6 that on the surface of the earth
133 When an object is released freely from certain height without applying any external force, then the object
A will move upwards with constant velocity
B will move upwards with accelerated motion
C will move downwards with constant velocity
D will move downwards with accelerated motion

Answer: will move downwards with accelerated motion
134 The value of acceleration due to gravity at the poles
A Same as at the equator
B Is more than at the equator
C Is less than at the equator
D zero

Answer: Is more than at the equator
135 The mass of an object __________
A remains constant
B is in the direction of gravitational force.
C varies at different locations
D can be measured using spring balance

Answer: remains constant
136 An object moving in (upward) direction opposite to the gravitational force of earth performs _________
A retarded motion
B oscillations
C accelerated motion
D motion with constant velocity

Answer: retarded motion
137 The value of acceleration due to gravity of the surface of the earth is
A 8 m/s2
B 9.8 m/s2
C 2 m/s2
D None of these

Answer: 9.8 m/s2
138 The gravitational force between two bodies is
A always repulsive
B always attractive
C can be attactive or repulsive
D neutral

Answer: always attractive
139 When echo is heard ?
A If the time interval between original sound and reflected sound is more than 1/10s.
B If the time interval between original sound and reflected sound is less 1/10s.
C If the tme interval between original sound and reflected sound is less than 1/120s.
D If the time interval between original sound and reflected sound is 1/120s

Answer: If the time interval between original sound and reflected sound is more than 1/10s.
140 Sound wave of which of the following frequency is an ultrasonics sound?
A 30,000 Hz
B 3000 Hz
C 30 Hz
D 300 Hz

Answer: 30,000 Hz

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