Physics

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
The diagram below shows a lever in use
Why is the ratio of the velocities of light of wavelengths 4000Å and 8000Å in vacuum 1:1
Why is the motion of a body moving with a constant speed around a circular path said to be accelerated
The power of a lens is -5D
State the position of the object in front of a converging lens if
State the relation between the critical angle and the absolute refractive index of a medium
The following diagram shows a 60, 30, 90 glass prism of critical angle 42
You have three resistors of values 2Ω, 3Ω and 5Ω
What do you understand by the term nuclear fusion
What do you understand by free vibrations of a body
How is the e.m.f. across primary and secondary coils of a transformer
How can a temperature in degree Celsius be converted into S.I. unit of temperature
A solid metal weighing 150 g melts at its melting point of 800° C by providing heat at the rate of 100 W
Identify the following wires used in a household circuit
What are isobars
State any two advantages of electromagnets over permanent magnets
Derive a relationship between S.I. and C.G.S. unit of work
A half metre rod is pivoted at the centre with two weights of 20 gf and 12 gf suspended at a perpendicular distance
A ray of light XY passes through a right angled isosceles prism as shown below
An object AB is placed between O and F1 on the principal axis of a converging lens as shown in the diagram
An object is placed at a distance of 12 cm from a convex lens of focal length 8 cm
Draw the diagram of a right angled isosceles prism which is used to make an inverted image erect
The diagram above shows a wire stretched over a sonometer
A person is standing at the sea shore. An observer on the ship which is anchored
A fuse is rated 8A. Can it be used with an electrical appliance rated 5 KW, 200 V? Give a reason.
Find the equivalent resistance between A and B
An electric iron is rated 220V, 2kW
Heat supplied to a solid change it into liquid. What is this change in phase called
State two differences between Heat Capacity and Specific Heat Capacity
The temperature of 170g of water at 50°C is lowered to 5°C by adding certain amount of ice to it. Find the mass of ice added
The diagram shows a coil wound around a U shape soft iron bar AB
The ore of Uranium found in nature contains 92U238 and 92U235
A brass ball is hanging from a stiff cotton thread
The distance between two bodies is doubled
Why is a jack screw provided with a long arm
If the power of a motor be 100 kW
Which class of lever will always have MA > 1 and why
Define heat capacity and state its SI unit
Why is the base of a cooking pan generally made thick
A solid of mass 50 g at 150oC is placed in 100 g of water