Categories
Assistant General Science

Physics – 09

താപവ്യതിയാനങ്ങൾ, ചലനം, പ്രവേഗം, ത്വരണം, ചലന നിയമങ്ങൾ എന്നിവയുമായി ബന്ധപ്പെട്ട ചോദ്യങ്ങളാണ് ഇന്നത്തെ പാഠത്തിൽ.

  • The process of conversion of a liquid into vapour is known as

Evaporation

 

  • The process of conversion of a solid directly into vapour is known as

Sublimation

 

  • Example of an object showing sublimation

Camphor

 

  • Quantity of heat required to convert unit mass of solid at its melting point into liquid is called

Latent heat of Fusion

 

  • For ice at 0°C, the latent heat of fusion is

80K Cal/kg

 

  • Quantity of heat required to convert unit mass of liquid at its boiling point into vapour is called

Latent heat of vapourisation

 

  • For water at 100°C, the latent heat of vaporisation is

540K Cal/kg

 

  • Device which converts heat energy into mechanical energy

Heat engine

 

  • A body is said to be a perfect blackbody if its

Absorption power is 1

 

  • A surface which absorbs all the heat radiations incident on it is known as

Perfectly black body

 

  • Device used to measure the temperature of sun

Pyrheliometer

 

  • Radiations received from a black body is called

Black body radiation

 

  • Estimated value of surface temperature of sun is

5778K

 

  • Study of high temperature is known as

Pyrology

 

  • Study of motion is known as

Mechanics

 

  • Study of causes and changes in motion is known as

Dynamics

 

  • Change in position of an object with respect to time and its surroundings is called

Motion

 

  • If an object does not change its position with respect to its surroundings, it is said to be

Stationary

 

  • The distance traveled by a body in unit time is called

Speed (Distance/Time)

 

  • Change in position of an object in a particular direction is called

Displacement

 

  • The distance traveled by a body in a definite direction in unit time is called

Velocity (Displacement/Time)

 

  • The rate of change of velocity of a moving body is called

Acceleration (Change in velocity/Time)

 

  • Slope of velocity time graph gives

Acceleration

 

  • Shape of acceleration versus mass graph for constant force is

Hyperbola

 

  • At terminal velocity the acceleration of body is

Zero

 

  • If the velocity of moving body decreases, the change in velocity is called

Retardation or Deceleration

 

  • Example of one dimensional motion

Throwing a stone straight up

 

  • Example of two dimensional motion

Projectile motion, Boat in a lake, Satellite revolving uniformly around earth

 

  • Example of three dimensional motion

Motion of a charged particle, A kite in air

 

  • If a body is moving in a circular path then the motion is said to be in

Circular motion

 

  • To and fro motion of an object is called

Oscillatory motion

 

  • Example of oscillatory motion

Pendulum of a clock

 

  • If a body is moving in a line then the motion is said to be in

Translational motion or Linear motion

 

  • Translational motion in a straight line is called

Rectilinear motion (Eg: Lift motion)

 

  • Translational motion in a curved path is called

Curvilinear motion (Eg: Motion of rocket in space)

 

  • Motion which repeats after regular intervals of time

Periodic motion (Eg: Rotation of earth around sun)

 

  • If the axis of the rotating body is within the body, its motion is said to be

Spin motion or Rotational motion (Earth spin)

 

  • When an object travels around another object, its motion is known as

Revolution (Eg: Earth travels around Sun)

 

  • Motion of an object in a vertical plane under the influence of gravitational force is known as

Projectile motion

 

  • Projectile path is known as

Trajectory

 

  • Projectile path is always

Parabola

 

  • Projectile reach its maximum range when the angle of projection is at

45°

 

  • The tendency of a body to continue its state of rest or uniform motion along a straight line is called

Inertia

 

  • Law of inertia was discovered by

Galileo

 

  • As the bus starts moving, a man sitting inside leans backward because of

Inertia of rest

 

  • As the bus stops moving, a man sitting inside bend in forwarding direction because of

Inertia of motion

 

  • Rotating wheel throw out mud tangentially outward because of

Inertia of direction

 

  • Force required to stop a moving body depends on

Its mass and velocity

 

  • Uniform acceleration produced in a freely falling body due to the gravitational pull of the earth is known as

Acceleration due to gravity (g=9.8 m/s²)

 

  • In earth acceleration due to gravity is maximum at

Polar regions

 

  • In earth acceleration due to gravity is minimum at

Equatorial regions

 

  • In earth acceleration due to gravity is zero at

Centre of the Earth


(To be Continued…)