ELECTRICITY & MAGNETISM
Frictional Electricity
Most commonly used element in semi conductor physics is ?
silicon (silicon is mostly used than germanium)
The range of projectile is max, when the angle of projection is_______
450
The waves in which particle of the medium vibrate in the direction of the Waves motion are called _________
Longitudinal waves
The Refractive index of transparent medium is always ___________.
greater than 1
The Magnetic materials having negative Susceptability are called as __________
Dia Magnetic
PN junction diode acts as _____ switch in forward bias and ______ switch in Reverse bias.
ON switch OFF switch
The angle between two forces when the resultant is minimum is _______
1800
On Volume basis, air contains how many parts of oxygen?
a) 12 b) 47 c) 21 d) 72
c) 21
Power of lens depends on _________ of the lens .
Focal length
In colour coding of resistors, if gray colour is in 3rd place then what is the multiplier value?
BBROYGBV'G'WGSN so multiplier value is 108
In Davisson-Germer experiment, the filament emits ____
a) Photons b) Protons c) X- rays d) Electrons
d) Electrons
The friction experienced by a body, when it is in motion is ________ friction.
Dynamic Friction
A sudden fall in the Barometer reading is the sign of approaching _________
a) wind b) storm c) rain d) heat
b) storm
In a concave mirror size of image depend on _________ of the object.
Position
When a Ferro Magnetic material is heated above its curie temperature ,the material becomes _______
Paramagnetic
The Orbital speed of the elctron in the ground state of hydrogen is v. What will be its orbital speed when it is excited to the energy state -3.4eV?
a) 2v b) v/2 c) v/4 d) v/8
b) v/2
One watt is equal to ________ joule/s
1
Which law states that the Internal energy of a gas is a function of temperature?
Joules law
Phase difference between the Electric and Magnetic field vectors in Electromagnetic waves is ______.
0
A small circula loop of wire is placed inside a long solenoid carrying a current.The plane of the loop contains the axis of the solenoid .If the current in the solenoid is varied , the current induced in the loop is _____
Zero
An Electron with Kinetic energy 10 eV is incident on a hydrogen atom in its ground state. The collision
a) must be elastic b) may be partially elastic
c) must be completely inelastic d) may be completely inelastic
b) may be partially elastic
The force which acts along the radius of a circle and directed away from centre is called __________
Centrifugal Force
When a wave travels from a denser to rarer medium , whta about the speed & amplitude ?
a) speed increases, amplitude decreases
b) amplitude increases , speed decreases
c) speed decreases, amplitude decreases
d)speed increases , amplitude increases
d) speed increases , amplitude increases
Power of lens is -4D then focal length is ________.
-0.25m