Physics

If the lens is placed in water instead of air, how does its focal length change
How does an increase in the temperature affect the specific resistance
Why is a nuclear fusion reaction called a thermo nuclear reaction
A magnet kept at the centre of two coils A and B is moved to and fro
State whether the specific heat capacity of a substance
Calculate the effective resistance across AB
Is it possible for a hydrogen nucleus to emit an alpha particle
Define resonant vibrations
State two ways to increase the speed of rotation of a D.C. motor
A body of mass 10 kg is kept at a height of 5 m
A uniform meter scale is in equilibrium
How does the angle of deviation formed by a prism change
An object is placed at a distance 24 cm in front of a convex lens
It is observed that during march-past we hear a base drum
A pendulum has a frequency of 4 vibrations per second
Two pendulums C and D are suspended from a wire
Write one advantage of connecting electrical appliances in parallel
What characteristics should a fuse wire have
Which wire in a power circuit is connected to the metallic body
The diagram below shows a dual control switch circuit
The diagram shows a circuit with the key k open
Define Calorimetry
The melting point of naphthalene is 80°C and the room temperature is 30°
104 g of water at 30°C is taken in a calorimeter made of copper of mass 42 g
Draw a neat labeled diagram of an A.C. generator
Define nuclear fission
The diagram below shows a magnetic needle
Define moment of force
Define a kilowatt hour. How is it related to joule
A satellite revolves around a planet in a circular orbit
Give one example of each when
A crane A lifts a heavy load in 5 seconds, whereas another crane B
A ray of light falls normally on a rectangular glass slab
Complete the path of the monochromatic light ray AB incident
Where should an object be placed in front of a convex lens
A pond appears to be 2.7 m deep. If the refractive index of water is 4/3
The wave lengths for the light of red and blue colours
Draw a graph between displacement from mean position and time
A sound wave travelling in water has wavelength 0.4 m
Why does stone lying in the sun get heated up much more than water
Why is it not advisable to use a piece of copper wire as fuse wire
Calculate the total resistance across AB
Two metallic blocks P and Q having masses in ratio 2:1
When a current carrying conductor is placed in a magnetic field
A nucleus of an element emits an alpha particle followed by a beta particle
The figure below shows a simple pendulum of mass 200 g
With reference to the direction of action, how does a centripetal force
A block and tackle system of pulleys has velocity ratio 4
A diver in water looks obliquely at an object AB in air
Complete the path of the ray AB through the glass prism in PQR