Deck 14: Physics Concepts and Formulas

Question 1

In elastic collisions,

A)only the total momentum of the colliding objects is conserved.
B)only the total kinetic energy is conserved.
C)both of the momentum and total kinetic energy are conserved.
D)neither momentum of the colliding bodies nor the total kinetic energy are

Answer 1

both of the momentum and total kinetic energy are conserved.

Question 2

Total angular momentum of a body is given by

A)I × ω; where I: moment of inertia of the body, ω: angular velocity
B)I² × ω; where I: moment of inertia of the body, ω: angular velocity
C)I² × ω²; where I: moment of inertia of the body, ω: angular velocity
D)I × ω²; where I: moment of inertia of the body, ω: angular velocity

Answer 2

I × ω; where I: moment of inertia of the body, ω: angular velocity

Question 3

Force that acts on a mass of 1 g and gives it an acceleration of 1 cm s ^-2 is defined as {{}}

A)1 newton
B)1 dyne
C)1 pound-force
D)1 pa-force

Answer 3

1 dyne

Question 4

An object moving in a circle of radius 'r' with a constant speed 'v' has a constant acceleration towards the center equal to

A)v²⁄r
B)v⁄r
C)v²×r
D)v×r

Question 5

Einstein's mass-energy relationship states that if the mass decreases by Δm, the energy released ΔE is given by {{}}

A)ΔE = Δm × c, where "c" denotes the speed of light.
B)ΔE = Δm × c², where "c" denotes the speed of light.
C)ΔE = Δm ⁄ c, where "c" denotes the speed of light.
D)ΔE = Δm ⁄ c², where "c" denotes the speed of light.

Question 6

Bernoulli's principle states that, for streamline motion of an incompressible non-viscous fluid:

A)the pressure at any part + the kinetic energy per unit volume = constant
B)the kinetic energy per unit volume + the potential energy per unit volume = constant
C)the pressure at any part + the potential energy per unit volume = constant
D)the pressure at any part + the kinetic energy per unit volume + the potential energy per unit volume = constant

Question 7

While Young's modulus 'E' relates to change in length and bulk modulus 'K' relates to change in volume, modulus of rigidity 'G' relates to change in:

A)weight
B)density
C)shape
D)temperature

Question 8

Young's modulus is defined as

A)tensile strain/tensile stress
B)tensile stress/tensile strain
C)tensile stress × tensile strain
D)length/area

Question 9

Velocity of escape is equal to

A)r × √(2g); where r: radius of Earth or any other planet for that matter, g: gravitational field strength
B)g × √(2r); where r: radius of Earth or any other planet for that matter, g: gravitational field strength
C)√(2g) ⁄ r; where r: radius of Earth or any other planet for that matter, g: gravitational field strength
D)√(2gr); where r: radius of Earth or any other planet for that matter, g: gravitational field strength

Question 10

Speed 'v' with which wave travels through a medium is given by

A)modulus of elasticity/density of the medium
B)modulus of elasticity/√(density of the medium
C)√(modulus of elasticity/density of the medium
D)v=d/t

Question 11

Hooke's law states that

A)the extension is proportional to the load when the elastic limit is not exceeded
B)the extension is inversely proportional to the load when the elastic limit is not exceeded
C)the extension is independent of the load when the elastic limit is not exceeded
D)load is dependent on extension

Question 12

Dimensions of strain are {{}}

A)[L]
B)[M] [L]-1[T]-2
C)[L]-1
D)It's a dimensionless quantity

Question 13

Due to energy dissipation by viscous forces in air, if simple harmonic variations of a pendulum die away after some time, then oscillation is said to be:

A)undamped
B)free
C)damped
D)dependent

Question 14

At 'yield point' of a copper wire

A)the load hasn't exceeded the elastic limit yet; so, Hooke's law applies
B)the load has already exceeded the elastic limit and the material has become plastic
C)even the plastic stage has passed and the wire has snapped already
D)Like Brass and Bronze, Copper has no yield point

Question 15

Stationary waves are also called

A)static waves
B)standing waves
C)progressive waves
D)All of the above

Question 16

When the work done in moving a particle round a closed loop in a field is zero, the forces in the field are called

A)Zero forces
B)Non-Conservative forces
C)Conservative forces
D)Viscous forces

Question 17

Substances that elongate considerably and undergo plastic deformation before they break are known as

A)brittle substances
B)breakable substances
C)ductile substances
D)elastic substances

Question 18

Velocity of sound waves through any material depends on

A)the material's density 'd' only
B)the material's density 'd' as well as its modulus of elasticity 'E'
C)the material's modulus of elasticity 'E' only
D)neither the material's density 'd' nor its modulus of elasticity 'E'

Question 19

Period of simple harmonic motion of a spiral spring or elastic thread is given by

A)T = 2π × (extension produced/gravitational field strength
B)T = 2π × (extension produced/√(gravitational field strength
C)T = 2π × (√(extension produced)/gravitational field strength
D)T = 2π × √(extension produced/gravitational field strength

Question 20

In order to slip one surface over another, maximum frictional force has to be overcome, this maximum frictional force between the two surfaces is also known as

A)kinetic frictional force
B)maximal frictional force
C)limiting frictional force
D)resisting force

Question 21

Van der Waals derived an expression for the 'pressure defect', if the observed pressure is denoted as 'p' and volume is denoted as 'V', the gas pressure in the bulk of the gas is equal to:

A)p + a/V; where a: constant for the particular gas
B)p + a/(V²); where a: constant for the particular gas
C)p + (a × V); where a: constant for the particular gas
D)p + (a × V²); where a: constant for the particular gas

Question 22

"Upthrust = Weight of the liquid displaced" is known as

A)Bernoulli's Principle
B)Archimedes' Principle
C)Pascal's Law
D)Coulomb's law

Question 23

Assuming uniform density of the core, the acceleration due to gravity below the Earth's surface is

A)inversely proportional to the square of the distance from the center of the Earth
B)inversely proportional to the distance from the center of the Earth
C)directly proportional to the square of the distance from the center of the Earth
D)directly proportional to the distance from the center of the Earth

Question 24

When a gas or a liquid is subjected to an increased pressure, the substance contracts, the bulk strain is defined as

A)final volume ⁄ original volume
B)final pressure ⁄ original pressure
C)change in volume ⁄ original volume
D)original volume ⁄ change in volume