Physics

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
Identify the class of the lever shown in the diagram below
A lens of focal length 20 cm forms an inverted image at a distance 60 cm
During the day: (i) Clouds appear white (ii) Sky appears blue
Name the system which enables us to locate underwater objects
What are acoustically measurable quantities related to pitch and loudness
When a tuning fork [vibrating] is held close to ear
A man standing in front of a vertical cliff fires a gun
The diagram below shows the core of a transformer and its input
What are superconductors
Calculate the current drawn by an appliance rated 110 W, 220 V
Name a substance whose resistance decreases with the increase in temperature
The diagram shows three resistors connected across a cell of emf 1.8 V
Heat capacity of a substance
The diagram shows the change of phases of a substance on a temperature vs time graph
A piece of ice of mass 60 g is dropped into 140 g of water
Draw a neat labeled diagram of a d.c. motor
Differentiate between nuclear fusion and nuclear fission
An atomic nucleus A is composed of 84 protons and 128 neutrons
State and define the S.I. unit of power
State the energy changes in the following cases while in use