04/11/2023
Class 9th Paper: Physics MCQs
Date: 03/11/2023
Solved by: Engr Fazal Khaliq
SECTION"A"
Time:20 Minutes. Marks:12
I).The quantity which is measurable:
Smell of flower
Beauty of person
Bravery of man
Length of a tree ✔️
Explanation:
(Length is Physical Quantity which is measurable by using vernier caliper, Micrometre screw gauge, Meter rule, measuring tape)
II).The distance covered by a body can be obtained by:
Velocity x Time
Speed x Time ✔️
Velocity/Time
Speed/Time
Explanation:
(As we know that Speed=Distance/Time, so multiply "time" on both side you will get
Distance= Speed×Time)
III). Which force is responsible for the propulsion of a jet engine?
Thrust force ✔️
Tension force
Centripetal force
Electrostatic force
Explanation:
(As the engine expels gases at high velocity in one direction, the jet experiences an equal and opposite force in the opposite direction, propelling it forward. This force is known as thrust)
IV). If the hinges of door are lubricated the force of friction will:
Increase
Decrease ✔️
Remain same
Be zero
Explanation:
(Friction can be reduced by using ball bearings, polishing the surface and by using lubricants (oil and grease)
V). The centre of gravity of a symmetric object is located at its:
Centre ✔️
Outer surface
Near the center
Between center and outer surface
Explanation:
(Center of gravity is the point where the whole weight of the appears to act, so for symmetric object it is located at Center)
VI).Example of dynamic equilibrium is:
Accelerating car
Freely falling paratrooper ✔️
Book laying at table
Oscillating pendulum
VII). The SI unit of weight is:
Kg
Kgm/s
Kgms
Kgm/s^2 ✔️
Explanation:
(1N = Kgm/s^2)
VIII). As we go below the earth's surface, the gravitational acceleration:
Decreases ✔️
Increases
Remains constant
Becomes negative
Explanation:
(The value of g decreases as we go below the earth surface and zero at earth center)
IX). A car uses energy of 3200J, and output is 8001, its efficiency is:
25%
30%
35%
40% ✔️
Explanation:
( Efficiency= Output/Input×100%)
X). A balloon is placed at the bottom of water tank of height 2m, pressure exerted by water on the
balloon is:
2000 Pa
20,000 Pa ✔️
20 Pa
200 Pa
Explanation:
(P= pgh) p= rho (density of water)
XI). Real and apparent expansion occurs in:
Glass
Hydrogen
Water ✔️
Iron
XII).In conductors the conduction of heat is due to:
Nucleus
Electrons ✔️
Protons
Neutrons
