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Free download in PDF CBSE class 9 Science Objective Type Questions with Answers. Here Gkseries provide Science Solve Questions and Answers for CBSE class 9 Students.
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
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
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
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
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
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
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
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
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