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Free download in PDF CBSE class 9 Science Objective Type Questions & Answers. Here Gkseries provide Science Solve Questions and Answers for CBSE class 9 Students.
(21)
As per the statement given in Q.9 above, What change it will take place for the potential energy of the car
[A]
It will remain the same
[B]
It will increase
[C]
It will decrease
[D]
It will becomes 3 times the Intial P.E.
Answer: It will remain the same
(22)
A car with mass ‘M’ is moving on horizontal road with velocity ‘v’. Driver applies accelerator and increases it speed 3 times to ‘3v’. The final K.E. acquired by the car will be :
[A]
4.5 Mv2
[B]
3.5 Mv2
[C]
1.5 Mv2
[D]
2.5 Mv2
(23)
An external force is being applied on an object at some angle and it causes the object either to be pulled or pushed on a rough surface. Which of the following holds true ?
[A]
It is easier to push the object
[B]
It is easier to pull the object
[C]
It requires same efforts to push or pull the object
[D]
None of the above
Answer: It is easier to pull the object
(24)
The value of 1 Kilo Watt Hour is
[A]
1.8 X 105J
[B]
3.6 X 106J
[C]
7.2 X 1010J
[D]
None of these
(25)
A runner, while moving, is facing a wind from the opposite direction. The work done by the wind on runner will be
[A]
Zero
[B]
Negative
[C]
Positive
[D]
Infinity
(26)
The commercial unit of energy consumption in households, industries and commercial establishments is
[A]
Joule
[B]
Watt
[C]
kW
[D]
KW h (kilowatt hour)
Answer: KW h (kilowatt hour)
(27)
Which of the following does not have unit as Joule?
[A]
Force
[B]
Potential energy
[C]
Work done
[D]
Kinetic energy
(28)
A soldier makes a swing jump between two points, by holding one end of a rope, other end of which is tied to some higher point. Work done by rope in jumping of soldier from one point to another is an example of :
[A]
Zero work done
[B]
Negative work
[C]
Positive work
[D]
None of the above
(29)
In winters, rubbing of hands together for some time, causes a sensation of warmth mainly because of
[A]
heat caused by the force of friction
[B]
heat caused by the momentum
[C]
heat caused by the motion
[D]
heat flows from the blood to skin
Answer: heat caused by the force of friction
(30)
A dog weighing 25 kg, while chasing a cat, jumps over a fence of height 1.6 m. What is the potential energy of dog at the top of fence ?
(Take gravity due to earth 'g'=10 m s-2 )
[A]
160 Joules
[B]
320 Joules
[C]
380 Joules
[D]
480 Joules
31
Two objects A and B are moving with same momentum. Mass of object 'B' is greater then mass of object 'A'. Which of the two object will have higher kinetic energy?
[A]
Object A
[B]
Object B
[C]
Both the objects will have same Kinetic Energy
[D]
Object with greater mass will have higher kinetic energy
32
A solid has
[A]
definite shape and volume
[B]
definite shape but no definite volume
[C]
definite volume and no definite shape
[D]
no definite volume no definite shape
Answer: definite shape and volume
33
Which of the following is NOT a property of particles of a matter?
[A]
The particles of matter are extremely small
[B]
The particles of matter have spaces between them.
[C]
The particles of matter are in stationery state.
[D]
The particles of matter attract each other.
Answer: The particles of matter are in stationery state.
34
A gas has
[A]
definite volume and no definite shape
[B]
no definite volume no definite shape
[C]
definite shape and volume
[D]
definite shape but no definite volume
Answer: no definite volume no definite shape
35
A liquid has
[A]
definite volume and no definite shape
[B]
definite shape and volume
[C]
no definite volume no definite shape
[D]
definite shape but no definite volume
Answer: definite volume and no definite shape
36
Which of the following has minimum spaces among the particles?
[A]
Solids
[B]
Liquids
[C]
Gases
[D]
None of these
37
During summer, water kept in an earthen pot becomes cool because of the phenomenon of
[A]
evaporation
[B]
osmosis
[C]
diffusion
[D]
transpiration
38
The rate of evaporation decreases with
[A]
increase in humidity
[B]
increase of temperature
[C]
increase in wind speed
[D]
increase of surface area
Answer: increase in humidity
39
A change of state directly from solid to gas without changing into liquid state (or vice versa) is called
[A]
Sublimation
[B]
Diffusion
[C]
Evalopartion
[D]
Condensation
40
Evaporation always causes
[A]
Cooling down
[B]
Liquification
[C]
thermal expansion
[D]
all of these