Well structured WBBSE Class 9 Physical Science MCQ Questions Chapter 2 Force and Motion can serve as a valuable review tool before exams.
Force and Motion Class 9 WBBSE MCQ Questions
Multiple Choice Questions :
Question 1.
Which of the following has no fixed melting point ?
(i) Ice
(ii) Wax
(iii) Lead
(iv) Iron
Answer:
Wax.
Question 2.
The value of acceleration due to gravity :
(i) 980 m/sec
(ii) 9.81 m / sec2
(iii) 9810 m / sec
(iv) 98 m / sec2
Answer:
9.81 m / sec2
Question 3.
If a body is taken in the moon then its weight will be :
(i) increased
(ii) decreased
(iii) same
(iv) zero
Answer:
Decreased.
Question 4.
Soda lime is :
(i) Na2 CO3, 10 H2O
(ii) NaOH
(iii) Mixture of NaOH and CaO
(iv) NaCl
Answer:
Mixture of NaOH and CaO.
Question 5.
Which is most fundamental ?
(i) mass
(ii) weight
(iii) density
Answer:
mass.
Question 6.
What is the ultimate form of all energies ?
(i) Heat
(ii) Light
(iii) Sound
(iv) Chemical
Answer:
Heat.
Question 7.
In an electric cell which type of energy changes to which other ?
(i) Chemical energy to electric energy
(ii) Heat energy to sound energy
(iii) Electric energy to chemical energy
(iv) Chemical energy to sound energy.
Answer:
Chemical energy to electric energy.
Question 8.
When a body is taken to a high altitude from the earth, what changes of mass and weight of the body are observed ?
(i) Mass remains same, weight decreases
(ii) Weight remains same, mass increases
(iii) Both mass and weight increase
(iv) Both mass and weight decrease
Answer:
Mass remains same, weight decreases.
Question 9.
What is the Einstein’s mass energy-equation ?
(i) E = mc2
(ii) E = m2c2
(iii) E = m2c
(iv) E2 = mc2
Answer:
E = m c2.
Question 10.
A non-conventional fuel is :
(i) natural gas
(ii) organic gas
(iii) petroleum gas
(iv) coal
Answer:
Organic gas.
Question 11.
Law of conservation of mass was emunicated by :
(i) Lavoisier
(ii) Dalton
(iii) Proust
(iv) Landolt.
Answer:
Lavoisier.
Question 12.
During photosynthesis, light energy is converted into :
(i) chemical energy
(ii) sound energy
(iii) electric energy
(iv) heat energy
Answer:
Chemical energy.
Question 13.
The force by which a body is attracted towards the centre of the earth is called :
(i) mass
(ii) weight
(iii) density of the body
Answer:
Weight.
Question 14.
Absolute unit of weight in CGS system is :
(i) newton
(ii) dyne
(iii) Joule
Answer:
Dyne.
Question 15.
The ability of doing work is known as :
(i) mass
(ii) weight
(iii) energy
Answer:
Energy.
Question 16.
During nuciear fission, atomic energy is converted into :
(i) heat energy
(ii) electric energy
(iii) magnetic energy
Answer:
Heat energy.
Question 17.
The earth receives solar energy at the rate of about :
(i) 1.8 × 109 megawatt
(ii) 18 × 109 megawatt
(iii) 20 × 109 megawatt
(iv) 2.1 × 109 megawatt
Answer:
18 × 109 megawatt.
Question 18.
In photo-electric cells, light energy is converted into :
(i) sound energy
(ii) magnetic energy
(iii) electrical energy
Answer:
Electrical energy.
Question 19.
The value of acceleration due to gravity at the centre of the earth is :
(i) 0
(ii) less than 0 (zero)
(iii) greater than 0 (zero)
Answer:
0 (zero).
Question 20.
If a body covers equal distances in equal time intervals, then it is :
(i) at rest
(ii) moving with uniform speed
(iii) moving with uniform velocity
(iv) moving with uniform acceleration
Answer:
Moving with uniform speed.
Question 21.
If a body moves with a constant speed, the distance – time graph is
(i) a straight line
(ii) a circle
(iii) a line like a staircase
(iv) a polygon
Answer:
A straight line
Question 22.
The area under the speed-time graph is a :
(i) circle
(ii) parabola
(iii) distance
(iv) none of these
Answer:
distance
Question 23.
The slope of a distance-time graph is :
(i) velocity
(ii) acceleration
(iii) displacement
(iv) speed
Answer:
Speed
Question 24.
The momentum of a body of given mass is proportional to its
(i) volume
(ii) shape
(iii) speed
(iv) density
Answer:
speed
Question 25.
Which of the following has the largest inertia ?
(i) a pin
(ii) your body
(iii) an orange
(iv) a brick
Answer:
your body
Question 26.
A body acted upon by a force must have :
(i) velocity
(ii) displacement
(iii) acceleration
(iv) none of these
Answer:
acceleration
Fill in the blanks :
1. Mass and energy cannot be always considered as ______ quantities.
Answer:
absolute.
2. Einstein showed that in high energy atomic reactions, a small part of ______ of the reactants transforms to energy.
Answer:
mass.
3. After a few changes and transformations, almost all kinds of energy may be proved to originate from the ______.
Answer:
sun.
4. Indian philosophers enunciated that anything that ______ is unperishable.
Answer:
exists.
5. An energy can produce mechanical work directly or after undergoing some ______ transformations.
Answer:
intermediate.
6. Every form of energy ultimately transforms to ______ energy directly or after some intermediate transformations.
Answer:
heat.
7. Energy can neither be created nor destroyed, only one form of ______ energy to other forms.
Answer:
transforms.
8. Electric energy transforms to ______ energy in electric lamps.
Answer:
light.
9. Mass of a body is the quantity of ______ it is made of.
Answer:
matter.
10. Mass is more fundamental than ______
Answer:
weight.
11. Mass of a body is measured by a common balance and ______ of a body is measured with the help of a spring balance.
Answer:
weight.
12. Weight is the ______ that a material body experiences towards the centre of the earth due to the gravitational pull of the earth.
Answer:
force.
13. The weight of a body is ______ in different places of the world.
Answer:
different.
14. Coal, petroleum, natural gas are – sources of energy.
Answer:
non-renewable.
15. If the earth’s gravitational attraction ceases, the acceleration due to gravity also ______
Answer:
ceases.
16. Mass of a body × ______ = Weight of body.
Answer:
Acceleration due to gravity.
17. Energy is defined as ______ to perform work.
Answer:
capacity.
18. Weight of a body is a ______ quantity.
Answer:
vector.
19. Mass is an ______ property of a body.
Answer:
intrinsic.
20. The energy of a moving body possessed by virtue of its ______ is called the kinetic energy.
Answer:
motion.
21. Mass of a body is the ______ of matter it is made of.
Answer:
quantity.
22. To accelerate a body, a must apply ______ on it.
Answer:
force.
23. The SI unit of force is ______.
Answer:
newton
24. A body at rest will remain at ______ it no unbalanced force is applied.
Answer:
rest
25. Action and reaction forces act on ______ bodies.
Answer:
different
26. The force is equal to the product of mass and ______ of the body.
Answer:
acceleration.