VIII

FILL IN THE BLANKS:

a) The three States of matter are ___, ____, and ____.

b) A vapour on cooling changes into ___ and on further cooling changes into____.

c)  The molecules (particles) of solid are____ packed.

d) A substance in the_____ state, has definite___ but not a definite___.

e) There are two types of molecular forces in nature ____and ___.

f) There is no change in____ when metal changes its phase.

g) A vapour on cooling changes into ____and further cooling changes into____.

h) Matter changes from one state to another either by raising the _____lowering the ____.

i) A. change in which a solid, on heating, directly changes into____ state is called___.

j) The intermolecular spaces are _____in gaseous and ____solids.

a) A body will sink_____ in pure water than in seawater.

b) An iron nail sinks in water but can float on _____.

c) Solids have ____density than liquids and liquids have ____density than gases.

d) The SI unit of density is_____

e) Mass = density x _____.

f) The density of an object remains____.

g) Density of water is ____.

h) Solids which are denser then a liquid_____ in that liquid.

i) Compared to liquid, gases are____ dense.

a) The type of the motion in which whole body displaced is called______.

b) Turning effect of force depends on___ and____.

c) In bicycle pedal force applied to the chain is ____then force applied at the pedal .

d) Sleepers below the rail track are used to _____weight and____ pressure on the ground.

e) The tip of the needle is made sharp to ____the pressure on it.

f) The gaseous envelope surrounding the earth is called ____.

g) in steering wheel the turning effect is maximum when forces are applied ____to the wheel.

h) The force acting ____to the surface is called thrust.

i) The tyres of vehicles designed to carry heavy load are____ as compared to those of cycles and bikes.

j) foundations of high rise buildings are made wide so that load is___ over a ___area.

k) 1 kgf= ____N(nearly ).

l) moment of force = ____ distance x distance of force from the point of turning.

m) in a door, handle is provided___ from the hinges.

n) pressure is the thrust acting on a surface of ____area.

o) the unit of pressure is ____

p) pressure increases on ____the depth.

a) SI unit of work is ____.

b) The energy possessed by a body by virtue of its position in a gravitational field is called its____

c) energy can neither be created nor destroyed but can only ____

d) As mass m and v² are always positive, therefore ____is always positive, i.e.,  cannot be negative.

e) When the pendulum oscillates it has____ at the extreme position and ____at the mean positions.

a) Glasses is optically____ than air.

b) Speed of light is____ in air.

c) When a Ray of light moves from glass into air it bends___ the normal.

d) Bending of light when it moves from one medium into another is called___  of light.

e) ____ mirror is used in solar farms.

f) Real image can be taken on____.

g) concave mirror has a _____focus.

h) A concave mirror is a ____mirror.

i) Splitting of light into its constituent colours is called___

j) light consists of ____colours.

a) Unit of loudness is______.

b)  any sound above 85 dB can____.

c) sound is a form of ____which excites in our ears the ___ of hearing.

d) Pitch is a sensation which determines____ of sound.

e) ____ is a continuous sound especially of someone speaking, that does not change in pitch .

f) The number of vibrations made by the vibrating body in 1 second is called ___.

g) Wind instrument produce sound when____ is blown in them.