Physics

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
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