III only
II & III only
I only
II, III & IV only
Correct answer is C
Simple pendulum does not depend on thermal expansion
Five alarms, Thermostat and Bimetallic thermometer are application of thermal expansion of solid
There is an explanation video available below.
Which of the following is not luminous object?
The sun
The moon
light candle
Star
Correct answer is B
Sun are self luminous source
Moon is a non – luminous
There is an explanation video available below.
He saw a flying objects
He must be thinking of water and food
He was seeing the shadow of the car
The sun ray from the sky were passing from a hot air (layer) to cold layer
Correct answer is D
The appearance of pool of water on road surfaces is called MIRAGE
His observation show that light from the sun ray refracted through a layer of hot air(layer) which is closed to the ground, passes from a hot air layer to the cold layer
Body floats in fluid when its …………………
Displaces its own volume of the liquid (fluid)
Displaces its own weight of the fluid
Displace its own density of the fluid
Is no longer subjected to gravity
Correct answer is B
Note:The principle of floatation states that a floating body displaces its own weight of the fluid or which its float.
For object to sink weight of the object (W) > upthrust of the fluid (v) i.e. w > u
(i.e. weight of the body (or object) mass of the fluid)
There is an explanation video available below.