List of practice Questions

What is meant by mass number of a nucleus? How is it different from atomic number?
Give an equation related to nuclear fusion.
Find the energy stored in a capacitance of 10 μF when it is charged to a potential difference of 2 volts.
In a Boolean expression \( Y = AB + BA' \), if \( A = 1 \), \( B = 1 \), then find the value of Y.
Show that N/C and V/m are the units of the same physical quantity. Name that physical quantity.
The kinetic energy of a charged particle decreases by 10 joules as it moves from a point at potential 200 volt to a point at potential 250 volt. Find the charge on the particle.
Write down two difficulties of Rutherford’s atomic model.
Define work function. Write its unit.
Electromagnetic waves are produced by
Planck's constant has the same dimensions
Two ideal batteries of same emf (E₁ = E₂) and same internal resistance (r₁ = r₂) are connected in parallel. Their equivalent emf is E and internal resistance is r. The correct option is
When an impurity is doped into intrinsic semiconductor, the conductivity of the semiconductor
Let \(i_e\), \(i_c\), and \(i_b\) represent the emitter current, the collector current, and the base current respectively in a transistor then
Mark out the correct option:
( If the energy of an atom in its ground state is -54.4 eV, then find its ionising potential.
Write Gauss' law of electrostatics and obtain Coulomb's law with its help.
Write Fleming's left hand rule. A particle of having charge \( 1.0 \times 10^{-9} \, \text{C} \) enters in a magnetic field of \( \vec{B} = (4 \hat{i} + 3 \hat{j}) \, \text{tesla} \) with velocity \( \vec{v} = (-75 \hat{i} + 100 \hat{j}) \, \text{m/s} \). Find the magnitude and direction of magnetic force exerting on the particle.
Derive an expression of intensity of magnetic field at the centre of a current-carrying circular coil at its centre. Also, enunciate the law used in it.
In the given circuit, calculate:
i) Current
ii) Voltage across the resistor
iii) Phase difference between L and C
State the conditions of interference of light. Obtain the expression for the fringe width in Young's double slit experiment.
Explain p-n-p transistor as a common emitter amplifier. What are the gains in it?
What is optical path? A monochromatic light ray of 6000 Å is incident on a glass slab. Refractive index of the slab is 1.5. Find the velocity and wavelength of reflected and refracted rays from the slab.
Find the angle of minimum deviation for an equilateral prism made of refractive index \( 1.732 \). What is the angle of incidence for the deviation?
A metallic stick of length \( L \) confined in a plane is rotated in its own plane with angular velocity \( \omega \) in a uniform magnetic field \( \vec{B} \) exists in the region. Find the expression of emf induced between the ends of the stick.
A diverging lens of focal length 20 cm and a converging lens of focal length 30 cm are placed 15 cm apart with their principal axes coinciding. Where should an object be placed on the principal axis so that its image is formed at infinity?