12th Std Physics One Mark Questions. We covered all the 12th physics one mark test in this post for free so that you can practice well for the exam.
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12th Std Physics One Mark Questions for Students
Which of the following has the smallest moment of inertia about the central axis if all have equal mass and radii
(A) Ring
(B) Disc
(C) Spherical shell
(D) Solid sphere
Option b – Disc
When the same torque acts on two rotating rigid bodies to stop them, which have the same angular momentum
(A) the Body with a greater moment of inertia stops first
(B) the Body with a smaller moment of inertia stops first
(C) Both bodies will be stopped after the same time
(D) We cannot predict which stops first
Option a – the Body with a greater moment of inertia stops first
In rotational motion, a moment of inertia :
(A) Imparts angular acceleration
(B) Opposes the change in rotational motion
(C) Imparts torque
(D) Increases the speed of rotation
Option b – Opposes the change in rotational motion
Spokes are used in a cycle wheel :
(A) To increase the strength of the wheel
(B) To increase the moment of inertia of the wheel
(C) To give better shape to the wheel
(D) To decorate the cycle
Option b – To increase the moment of inertia of the wheel
The mass of the flywheel is concentrated on its rim this is done to :
(A) To increase the moment of inertia
(B) To decrease the moment of inertia
(C) To obtain a stable equilibrium
(D) To obtain a strong wheel
Option a – To increase the moment of inertia
The moment of inertia of a rigid body does not depend upon its
(A) Mass
(B) Distribution of mass about the axis
(C) Angular velocity of the body
(D) Shape of the body
Option c – Angular velocity of the body
The moment of inertia in rotatory motion is comparable to this quantity in translatory motion
(A) Momentum
(B) Mass
(C) Weight
(D) Velocity
Option b – Mass
Which of the following bodies having the same mass and same radius has the largest moment of inertia?
(A) Ring about its axis perpendicular to its plane
(B) Disc about its axis perpendicular to its plane
(C) Solid sphere
(D) Bar magnet
Option a – Ring about its axis perpendicular to its plane
The moment of inertia of a body does not depend on
(A) The mass of the body
(B) The angular velocity of the body
(C) The axis of rotation of the body
(D) The distribution of the mass in the body.
Option b – The angular velocity of the body
If the position of the axis of rotation of a body is changed, which of the following physical quantities will not change?
(A) The radius of gyration
(B) Moment of inertia
(C) Distribution of mass
(D) Mass
Option d – Mass
A hollow cylinder and a solid cylinder of the same mass and radius are made to roll down on an inclined plane. Which one reaches the bottom first?
(A) The solid cylinder
(B) The hollow cylinder
(C) Both together
(D) The one with a higher density of the material
Option a – The solid cylinder
A solid sphere, disc, and solid cylinder all of the same mass and made up of the same material are allowed to roll down from rest on an inclined plane :
(A) Solid sphere reaches the bottom first
(B) Disc reaches the bottom first
(C) Solid cylinder reaches the bottom first
(D) All reach simultaneously
Option a – Solid sphere reaches the bottom first
The period of oscillation of a simple pendulum decrease by 10% when its length is decreased by 19 cm. Then its initial length :
(A) 49 cm
(B) 98 cm
(C) 100 cm
(D) 490cm
Option c – 100 cm
The bob of a simple pendulum of length 50 cm has a speed of 3 m/s at its lowest position. When the length of the pendulum makes an angle of 60⁰ with the vertical then the speed of the bob is :
(A) 3 m/s
(B) 2 m/s
(C) 1.5 m/s
(D) 1 m/s
Option b – 2 m/s
The period of oscillation of a simple pendulum gets doubled when its length is increased by 1.2 m then its original length is :
(A) 0.2 m
(B) 0.1 m
(C) 0.3 m
(D) 0.4 m
Option d – 0.4 m
The time period of a simple pendulum is 2 s. If its length is increased by 4 times, the time period becomes :
(A) 4 S
(B) 6 S
(C) 8 S
(D) 2 S
Option a – 4 S
If a watch with a wound spring is taken to the moon, it :
(A) runs faster
(B) runs slower
(C) does not work
(D) shows no change
Option d – shows no change
In a second pendulum mass of the bob is 30 gm. If it is replaced by 90 gm mass. Then its time period will be :
(A) 1 s
(B) 2 s
(C) 4 s
(D) 3 s
Option b – 2 s
If the length of a simple pendulum is increased by 2% then the time period :
(A) Decreases by 2%
(B) Increases by 2%
(C) Increases by 1%
(D) Decreases by 1%
Option c – Increases by 1%
If a simple pendulum oscillates with an amplitude of 50 mm and a time period of 2 s then its maximum velocity is :
(A) 0.10 m/s
(B) 0.157 m/s
(C) 0.25 m/s
(D) 0.5 m/s
Option b – 0.157 m/s
The amplitude of the second pendulum is reduced by 20%. The percentage change in its time period is :
(A) 10%
(B) 25%
(C) 20%
(D) 0%
Option d – 0%
The ratio of the height of the mountain and the depth of a mine, if a pendulum swings with the same period at the top of the mountain and at the bottom of the mine is :
(A) 1 : 1
(B) 1 : 2
(C) 2 : 1
(D) 4 : 1
Option b – 1 : 2
A second pendulum is taken from Earth to the moon. If it is to act as a seconds Pendulum there also, the length of the pendulum :
(A) should be increased
(B) should be decreased
(C) need to be changed
(D) difficult to imagine
Option b – should be decreased
A body falling freely on a planet covers 8 m in 2 seconds. The time period of a one-meter-long simple pendulum on this planet will be :
(A) 1.57 s
(B) 3.14 s
(C) 6.28 s
(D) 2 s
Option b – 3.14 s
Two pendulums of lengths 100 cm and 121 cm start vibrating. At some instant, the two are at the mean position in the same phase. After how many vibrations of the longer pendulum will the two be in the same phase at the mean position again?
(A) 10
(B) 11
(C) 20
(D) 21
Option a – 10
A small spherical steel ball is placed a little away from the center of a large concave mirror whose radius of curvature R = 2.5 m. When the ball is released it begins to oscillate about the center. Find the period of oscillation :
(A) 1.57 s
(B) 3.14 s
(C) 2 s
(D) 6.28 s
Option b – 3.14 s
Does a simple pendulum have a time period of T. What will be the percentage change in its time period if the amplitude is decreased by 5%?
(A) 6%
(B) 3%
(C) 1.5%
(D) It will remain unchanged
Option d – It will remain unchanged
The period of a simple pendulum of a length L at a place where the acceleration due to gravity is g is T. What is the period of a simple pendulum of the same length at a place where the acceleration due to gravity is 1.02 g?
(A) T
(B) 1.02 T
(C) 0.99 T
(D) 1.01 T
Option c – 0.99 T
The length of the second’s pendulum at a place where g is 980 cm/s² is near:
(A) 100 cm
(B) 200 cm
(C) 50 cm
(D) 25 cm
Option a – 100 cm
A second’s pendulum is mounted in a rocket. Its period of oscillation will decrease when the rocket is :
(A) Moving up with uniform velocity
(B) Moving up with the uniform acceleration
(C) Moving down with uniform acceleration
(D) Moving in a geostationary orbit
Option b – Moving up with the uniform acceleration
When the length of the simple pendulum is increased by 22 cm, the period changes by 20%, the original length of the simple pendulum :
(A) 100 cm
(B) 122 cm
(C) 150 cm
(D) 50 cm
Option d – 50 cm
The time period of a particle performing SHM is 6.28 seconds and has an amplitude of 3 cm. What is its maximum acceleration?
(A) 3 cm/s²
(B) 12 cm/s²
(C) 9.87 cm/s²
(D) 18.84 cm/s²
Option a – 3 cm/s²
The maximum acceleration of the particle performing SHM numerically equal to twice the maximum velocity than the period is :
(A) 1.57 s
(B) 3.14 s
(C) 6.28 s
(D) 2 s
Option b – 3.14 s
A body executes S.H.M with a period of 11/7 sec and amplitude of 0.25 m. The maximum value of the acceleration is :
(A) 4 m/s²
(B) 2 m/s²
(C) 0.5 m/s²
(D) 0.4 m/s²
Option a – 4 m/s²
In S.H.M the velocity of a particle at the mean position is 1 m/s and acceleration at the extreme position is 2 m/s² then the angular velocity of the motion is :
(A) 2 rad/s
(B) 1 rad/s
(C) 0.5 rad/s
(D) 3 rad/s
Option a – 2 rad/s
The displacement of the particle performing SHM is given by y = 0.5 sin (5 t+ 0.5) where y is in cm and t is second. The maximum speed of the particle will be :
(A) 2.5 cm/s
(B) 12.5 cm/s
(C) 30 cm/s
(D) 5 cm/s
Option a – 2.5 cm/s
The amplitude of SHM in the above question is 4 cm, and the period of oscillation will be :
(A) 4 s
(B) 0.25 S
(C) 2.512 s
(D) 0.1 s
Option c – 2.512 s
A particle executes linear SHM of period 4 seconds and amplitude 4 cm, the time taken by it to describe a distance of 1 cm from the positive extreme position :
(A) 0.46 s
(B) 6 s
(C) 4.6 s
(D) 4 s
Option a – 0.46 s
A particle is moving on a circle with uniform speed; its motion is :
(A) Periodic and simple harmonic
(B) Periodic but not simple harmonic
(C) Aperiodic
(D) Nonuniform circular motion
Option b – Periodic but not simple harmonic
The maximum velocity and maximum acceleration of a body moving in a simple harmonic oscillator are 2 m/s and 4 m/s². The angular velocity is :
(A) 1 rad/s
(B) 2 rad/s
(C) 4 rad/s
(D) 5 rad/s
Option b – 2 rad/s
Two capillary tubes P and Q are dipped in water. The height of the water level in capillary P is 2/3 of the height in the Q capillary. The ratio of their diameters is :
(A) 2 : 3
(B) 3 : 2
(C) 3 : 4
(D) 4 : 3
Option b – 3 : 2
A capillary tube of radius r is immersed in water which rises to height h. The mass of water in the capillary tube is M. If another capillary tube of the double radius is immersed in the same water then the mass of water in the capillary tube will be :
(A) M
(B) 2 M
(C) M/2
(D) 4 M
Option b – 2 M
The angle of contact between glass and water is 0° and it rises in a capillary up to 6 cm when its surface tension is 70 dyne/cm. Another liquid of surface tension 140 dyne/cm, angle of contact 60° and relative density 2 will rise in the same capillary by
(A) 12 cm
(B) 24 cm
(C) 3 cm
(D) 6 cm
Option c – 3 cm
5 g of water rises in the bore of the capillary tube when it is dipped in water. If the radius of the bore of the capillary tube is doubled, the mass of water that rises in the capillary tube above the outside water level is :
(A) 1.5 g
(B) 5 g
(C) 10 g
(D) 15 g
Option c – 10 g
Two capillary tubes of the same material but of different radii are dipped in a liquid. The heights to which the liquid rises in the two tubes are 2.2 cm and 6.6 cm. The ratio of radii of the tubes is :
(A) 1 : 9
(B) 9 : 1
(C) 1 : 3
(D) 3 : 1
Option d – 3 : 1
If a liquid of specific gravity 1 rises to a height of 2.5 cm in the capillary tube then another liquid of specific gravity 1.25 will rise to the height (in the same tube) is :
(A) 1 cm
(B) 2 cm
(C) 1.25 cm
(D) 1.5 cm
Option b – 2 cm
The excess pressure inside one soap bubble is double that inside second. The volumes of the two bubbles are in the ratio :
(A) 1 : 9
(B) 9 : 1
(C) 8 : 1
(D) 1 : 8
Option d – 1 : 8
Water rises in a capillary tube through a height of h. If the tube is inclined to the liquid surface at 30°. The liquid will rise in the tube up to its length equal to
(A) h/2
(B) h
(C) 2h
(D) 4h
Option c – 2h
A capillary tube when immersed vertically in a liquid records a rise of 3 cm. If the tube is immersed in the liquid at an angle of 60° with the · vertical, the length of the liquid column along the tube will be :
(A) 2 cm
(B) 3 cm
(C) 6 cm
(D) 9 cm
Option c – 6 cm
A liquid rises to a height of 9 cm in a glass capillary of radius 0.02 cm. The height of the liquid column in a glass capillary of radius 0.03 cm is :
(A) 3 cm
(B) 6 cm
(C) 9 cm
(D) 12 cm
Option b – 6 cm
A capillary tube of the uniform bore is dipped vertically in the water, which rises by 7 cm in a tube, Find the radius of the capillary if the surface tension of water is 70 dyne/cm :
(A) 0.2 mm
(B) 0.2 cm
(C) 2 cm
(D) 0.02 mm
Option a – 0.2 mm
A very narrow capillary tube records a rise of 20 when dipped in water. When an area of the cross cm, is reduced to one-fourth of the former value, the section is water will rise to the height of
(A) 10 cm
(B) 20 cm
(C) 40 cm
(D) 80 cm
Option c – 40 cm
The height upto which the water will rise in a capillary tube will be :
(A) Minimum when the water temperature is 4°C
(B) Maximum when the water temperature is 4°C
(C) Minimum when the water temperature is 0°C
(D) Same at all temperatures
Option a – Minimum when the water temperature is 4°C
When a capillary tube is dipped vertically in a liquid, the angle of contact is 140°. When the tube is dipped with an inclination of 40°, the angle of contact is :
(A) 60°
(B) 100°
(C) 140°
(D) 180°
Option c – 140°
Excess of pressure inside a bubble of radius r and surface tension T is :
(A) T/r
(B) 2T/r
(C) 3T/r
(D) 4T/r
Option d – 4T/r
The lower end of a capillary tube is dipped in a liquid whose angle of contact is 90°. The liquid :
(A) Will neither rise nor fall inside the tube
(B) Will rise inside the tube
(C) Will rise to the top of the tube
(D) Will fall inside the tube
Option a – Will neither rise nor fall inside the tube
Water rises against gravity in the capillary tube when its one end is dipped into the water because :
(A) Pressure below the meniscus is less than atmospheric pressure
(B) Pressure below the meniscus is more than atmospheric pressure
(C) Capillary attracts water
(D) Of viscosity
Option a – Pressure below the meniscus is less than atmospheric pressure
It is not possible to write directly on blotting paper or newspaper with an ink pen :
(A) Because of viscosity
(B) Because of inertia
(C) Because of friction
(D) Because of capillarity
Option d – Because of capillarity
Water rises in a capillary tube to a height ‘h’, it will rise to a height of more than h :
(A) On the surface of the sun
(B) At the poles
(C) In a lift moving down with an acceleration
(D) In a lift moving up with an acceleration
Option c – In a lift moving down with an acceleration
Water can rise up to a height of 12 cm in a capillary tube. If the tube is lowered to keep only 9 cm above the water level then the water at the upper end of the capillary will :
(A) Overflow
(B) Form a convex surface
(C) Form a flat surface
(D) Form a concave surface
Option c – Form a flat surface
The flow of ink in the refill of the dot pen is due to
(A) Capillarity
(B) Surface tension
(C) Viscosity of ink
(D) Gravitation
Option a – Capillarity
The meniscus of liquid is concave. If P₁ and P2 are pressure just above and below the meniscus then :
(A) P₁ = P₂
(B) P₁ > P₂
(C) P₁ < P₂
(D) P₁ = P₂ = 0
Option b – P₁ > P₂
Excess of pressure inside the liquid drop of radius r and surface tension T is :
(A) T/r
(B) 2T/r
(C) 3T/r
(D) 4T/r
Option b – 2T/r
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