diploma physics imp questions
Diploma physics
1. Units and dimensions (3marks)
1.
Mention the
limitations of dimensional analysis.
2.
Give the uses of
dimensional formulae.
3.
What is a
dimensional formula? Write the dimension of force and momentum.
4.
What is unit?
Write the names of system that unit.
5.
Write that
dimensional formulae of A) work B) pressure C) acceleration due to gravity.
6.
Convert the unit
of work from SI system to CGS system.
7.
Derive the
formulae
using the
method of dimensions.
8.
Check the
correctness of the formulae
using the
method of dimensions.
9.
Give the SI units
of power, pressure, and angular momentum.
10. Give the basic units of fundamental quantities in SI
system.
2.
Vectors (3+10=13 marks)
Short (3marks)
1.
Find the angle
between the vector A=i-j+2k;B=2i+j+k .
2.
Give the
resultant of two parallel vectors of the magnitude 2m and 3m.
3.
Define vector and
scalar quantities. Can a vector be added
to a scalar?
4.
A=2i-2j+k; B=3I+6J+nk
are perpendicular. Find the value of n?
5.
State triangle
law of vectors.
6.
State polygon law
of vectors.
7.
Define the scalar
product of two vectors give the properties of dot product.
8.
State and explain
cross product of two vectors.
ESSAY (10 marks)
1.
State and prove
the law of parallelogram of forces .derive the equation for the magnitude and
direction of resultant.
2.
A) State and
explain polygon law of forces giving a neat diagram.
B) A force of 6i+12j+8k produce a displacement
of 2i+3j+5k find the work done.
3.
A) Explain dot
product and cross product of two vectors B) if │AxB│=A.B find the angle between
A and B.
3.
Kinematics (3+10=13 marks)
Short (3marks)
1.
Derive the
expression for maximum height reached by a vertically projected body.
2.
Derive the
expression for the time of ascent of a body projected vertically up.
3.
Define
acceleration due to gravity and gives its unit.
4.
Show that the
time of decent (t1=u/g).
5.
An athlete a
takes a long jump at angle of 45 explain why?
6.
Show that the
path of horizontal projectile is a parabola.
ESSAY (10 MARKS)
1.
A) Show that the
path of an oblique projective is a parabola.
B) Obtain the equation for the range and time of
flight.
2.
Define the
acceleration due to gravities show that the velocity of a body projected
vertically up falls a reaches the ground in the same velocity.
3.
A) Give the
kinematic relation for the body projected vertically up.
B) Show that the time of ascent equal to the
time of descent.
4.
A) Obtain
equation for the range of a horizontal projectile.
B) Derive the formula for the resultant
velocity when it reaches the ground.
4.
Friction (3marks)
1.
State the laws of
static friction.
2.
Distinguish
between static friction and limiting friction.
3.
Explain the
methods of reducing the friction.
4.
A body of mass
100kg rests on a horizontal surface of
calculate the work done in dragging a body through a
distance of 100m.
5.
Derive the
equation for acceleration of a body sliding down the rough inclined planes.
6.
It is difficult
to start the motion than the continue the motion. Explain?
7.
Is it easier to
roll a barrel or to pull it on a horizontal road? Explain.
8.
Define the angle
of repose and deduce the equation for it.
9.
Give the
advantages and disadvantages of friction.
5. Work –power energy
(10marks)
1.
State the law of
conservation energy and prove it in the case of freely falling body.
2.
A) Define P.E and
K.E.
B) Obtain
the equation for K.E=1/2mv2.
C) A bullet of mass 10g is fired with a
velocity of 300m find it’s K.E.
3.
A) State and
prove the work energy theorem.
B) An engine is used to lift water from a
well 40m below. To fill a tank 2m X2mX3m in 5minutes find the power of the
engine.
6. S H M (3+10=13 marks)
(3marks questions)
1. Write the conditions for S H M.
2. Give the formula for velocity of S H M .write the formula for v max
and v.
3. Define ideal simple pendulum and second’s pendulum.
4. Give the formula for acceleration of a particle in S H
M.
5. A boy sitting in a swing is oscillating. What happens
to the time period if he stands in the swing?
6. The acceleration of a particle in S H M is 0.4 m/sec when
x=0.6m. Find the acceleration when the displacement x=0.5 m.
7. Define S H M.
8. Define the terms i) Amplitude ii) time period iii)
frequency of SHM.
9. State the laws of simple pendulum.
10. Give the equation of SHM and explain the terms.
Essay (10marks)
1. Show that the oscillation of a simple pendulum is
simple harmonic and derive the equation for time period.
2. Define S H M. and give three examples. Explain that
the projection of uniform circular motion on any diameter of a circle is simple
harmonic.
3. Derive the equation for velocity and acceleration in
SHM.
4. Describe the experiment to determine acceleration due
to gravity using simple pendulum. How is the length of a second’s pendulum determined?
7
.heat and thermodynamics (3+10=13 marks)
(3marks questions)
1. Evaluate ideal gas constant.
2. What is internal energy of a gas? How is related to
temperature.
3. Give the relation between pressure and density of a
given mass of a gas at constant temperature.
4. What is difference between specific heat and molar
specific heat of a gas?
5. State first law of thermodynamics.
6. State Boyle’s law and Charles laws.
7. What is absolute scale of temperature?
8. State second law of thermodynamics.
9. Give the difference between isothermal and adiabatic
changes.
10. Derive the equation for the external work done by a
gas.
Essay (10marks)
1. A) State gas laws. Derive ideal gas equation.
B)
At 27oc the pressure is 2 Atm at constant volume what will be its
pressure at 627oc.
2. Define molar specific heats Cp and Cv and
derive Cp - Cv=R.
3. State Boyle’s law. Explain the experiment to verify
Boyle’s law.
4. A) Distinguish between isothermal and adiabatic
process.
B)
Obtain the relation between P and d at constant temperature for a given mass of
a gas.
8.
Sound
(3+10=13 marks)
(3marks questions)
1. What is echo? What is the minimum distance to hear the
echo?
2. What is reverberation time give Sabine’s formula?
3. Define longitudinal and transverse waves? is the sound
propagation in air longitudinal or transverse.
4. What are beats? Give the formula for number of
beats/sec.
5. What are the characteristics of sound?
6. Distinguish between musical sound and noise?
7. What are the applications of beats?
8. What are the applications of Doppler Effect?
9. Write the SI unit of noise. Give the value of noise
level of ordinary conversation?
Essay (10marks)
1. A) Distinguish between musical sound and noise.
B)
What is noise pollution write any six methods of reducing noise pollution.
2. A) What is Doppler Effect?
B)
Derive the formula for apparent frequency i) when the source alone is moving
ii) when the observer alone is moving.
C) Write any four applications of Doppler Effect.
3. A) Explain reverberation, reverberation time.
B)
Define echo and applications of echo.
9. Properties of matter (3+10=13 marks)
(3marks questions)
1.
Define
coefficient of viscosity and give its dimensional formula.
2.
Define stress and
strain what is the relation between them.
3.
Define the terms
i) elastic fatigue ii) compressibility.
4.
Explain why a soap bubble attains a spherical
shape.
5.
State Hooke’s law and define rigidity modulus.
6.
Define surface
tension and give its dimensional formula and SI units.
7.
Explain how a
plant absorbs water from the earth.
8.
Explain the
effect of the temperature on coefficient of viscosity for liquid and gases.
9.
Mention the
effects of surface tension of water.
Essay (10marks)
1.
Give Newton
formula for the viscosity .write a poiseulle’s method of determining the
coefficient of viscosity.
2.
Define the angle
of contact explain how capillary rise arises .Describe the experimental methods
to determine surface tension.
3.
Define the terms
i) cohesive forces ii) adhesive forces iii) sphere of influence.
4.
Explain the
surface tension on the basis of molecular theory.
10
Electricity
and magnetism (3+10=13 marks)
(3marks questions)
1.
State and explain
coulombs law in magnetism.
2.
Define
resistivity and give the expression and SI units for it.
3.
State Ohm’s law
and explain ohmic and non-ohmic resistances.
4.
Define magnetic
moment and give its SI units.
5.
If the distance
between magnetic poles is increased to three times what happens to the force
between them.
6.
A magnet of
moment 20 amp per square meter is placed in a uniform magnetic field of
induction 0.02T so that it makes an angle 45 to the field .find the torque.
7.
Define uniform
and non uniform magnetic induction.
8.
State kichoff’s
junction and loop theorems.
Essay (10marks)
1.
A) State and explain
Kirchhoff’s laws.
B) Describe the meter
bridge experiment determine the resistance of the filament.
2.
Define moment of magnet
and derive the equation for the moment of the couple action on a bar magnet
when is the moment of the couple zero and maximum.
3.
Explain the
principle a Wheatstone bridge derive the condition for balancing.
4.
A) Derive an
expression for the magnetic induction at a point i) on the axial line. ii)
Along the equatorial line of a bar magnet.
11 modern physics (3MARKS)
1.
State the laws of
photo electric effect.
2.
What is an
optical fiber? Name different types of optical fiber.
3.
Define critical
angle and explain total internal field.
4.
Briefly explain a
photo electric cell.
5.
Write any three properties
of superconductors.
6.
Mention any four
uses of photoelectric effect.
7.
Explain the
working principle of optical fiber.
8.
What is super conductivity?
