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.
