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What is the direction of the force acting on a charged particle q, moving with a velocity in a uniform magnetic field ?Marks:1
The force is given by
This force is right angles to & .
Name the absorbing material used to control the reaction rate of neutrons in a nuclear reactor.Marks:1
Cadmium rods are the absorbing material used to control the reaction rate of neutrons in a nuclear reactor.
State the reason, why two independent sources of light cannot be considered as coherent sources.Marks:1
Because, they will produce the phase difference and produce interference.
Name the part of the electromagnetic spectrum of wavelength 10-2m and mention its one application.Marks:1
Microwaves. It is used in radar & communication purposes.
An electron and a proton have the same de-Broglie wavelength associated with them. How are their kinetic energies related to each other?Marks:1
charge is at the center of a square of side 10 cm. Find the work done in moving a charge of 10 C between two diagonally opposite points on the square.Marks:1
According to the given condition, we have
VOA = VOB
Therefore, work done is given by
W = q( VOB - VOA)
Hence, W is zero.
How does the power of a convex lens vary, if the incident red light is replaced by violet light?Marks:1
The power increases because the refractive index of a material is more for violet colour.
The plot of the variation of potential difference across a combination of three identical cells in series, versus current is as shown below. What is the emf of each cell?Marks:1
Since all the cells are connected in series so current flowing through each cell is same. Therefore total resistance given by
Rt = 6/1 = 6
Internal resistance of each cell is 6/3 = 2
Now e.m.f. of each cell is = 2 x 1A = 2 volts
Draw a ray diagram of a compound microscope. Write the expression for its magnifying power.Marks:2
Ray diagram for the formation of image in a compound microscope
Magnifying power:- M = (L/f0) (1 + D/fe)
Where M = Magnifying power.
L = Length of microscope tube (= v).
fo = Focal length of objective lens.
D = Least distance of distinct vision.
fe = Focal length of eye piece.
A ray of light passing through an equilateral triangular glass prism from air undergoes minimum deviation when angle of incidence is 3/4th of the angle of prism. Calculate the speed of light in the prism.Marks:2
i1= i2 = (3/4)A = 450 (according to given condition)
Determining the value of ,
A + = i1+i2.
or 600 + = 450+450.
= 900 - 600 = 300.
The speed of light is given by,