Physics

Name two factors on which the heat energy liberated
A Lens forms an upright and diminished image of an object
A ray of light travels from water to air
The diagram below shows a point source P inside a water container
Loudness of the sound heard
What are damped vibrations
A wire of length 80 cm has a frequency of 256 Hz
The colour code of the wire connected to the metallic body
Draw the diagram of a dual control switch when the appliance is switched ON
Which particles are responsible for current in conductors
To which wire of a cable in a power circuit
To which wire should the fuse be connected
Explain the meaning of the statement current rating of a fuse is 5A
In the transmission of power, the voltage of power generated at the generating stations
Answer the following questions based on a hot cathode ray tube
State three factors on which the rate of emission of electrons
What are free electrons
Give an example of a non-contact force
How does the magnitude of this non-contact force
A boy weighing 40kgf climbs up a stair of 30 steps each 20cm high
With reference to the terms Mechanical Advantage, Velocity Ratio and efficiency
Calculate the mass of ice required to lower the temperature of 300g
The heat capacity of the body is 60 JK-1
State two factors upon which the heat absorbed by a body depends
A boy uses blue colour of light to find the refractive index of glass
State the dependence of angle of deviation
The ratio of amplitude of two waves is 3 : 4. What is the ratio of their
State two ways by which the frequency of transverse vibrations
What is meant by noise pollution
The V-I graph for a series combination and for a parallel combination of two resistors
A music system draws a current of 400 mA when connected to a 12 V battery
Calculate the quantity of heat produced in a 20 Ω resistor carrying
State the characteristics required of a good thermion emitter
An element ZSA decays to 85R222 after emitting 2 α particles
A radioactive substance is oxidized
State the characteristics required in a material
Which coil of a step up transformer is made thicker and why
A stone of mass ‘m’ is rotated in a circular path with a uniform speed
An effort is applied on the bigger wheel of a gear having 32 teeth
What kind of pulleys are A and B
A pulley system has three pulleys
What is the principle of method of mixtures
Some ice is heated at a constant rate, and its temperature
A copper vessel of mass 100 g contains 150 g of water at 50°C
Write a relationship between angle of incidence and angle of refraction
When a ray of light enters from one medium to another having different optical
Write one condition where it does not bend when entering
A lens produces a virtual image between the object and the lens
What do you understand by the term ‘Scattering of light’
Name the waves used for echo depth sounding