Download PHYSICS JUNIOR IPE IMPORTANT QUESTIONS BANK PHYSICS

PHYSICS
JUNIOR IPE IMPORTANT QUESTIONS BANK
PHYSICS
QUESTION BANK ANALYSIS
S.No
NAME OF THE CHAPTER
LAQ
SAQ
***
**
*
***
**
*
VSAQ
TOTAL
1
Physical World
_
_
_
_
_
_
3
3
2
_
_
_
_
_
_
7
7
3
Measurements
Units and Dimensions
Motion in Straight line
_
_
_
1
4
1
4
10
4
Motion in a plane
_
_
_
7
2
7
16
5
Laws of Motion
1
_
_
3
2
9
17
6
Work Energy and Power
2
1
1
3
6
13
7
3
-
_
2
3
_
6
14
8
System of Particles and
Rotational Motion
Oscillation
3
-
_
1
2
_
6
12
9
Gravitation
-
3
_
5
1
_
8
17
10
Mechanical Properties of Solids
1
-
_
2
5
_
6
14
11
Mechanical properties of Fluids
-
1
_
3
4
2
9
19
12
Thermal properties of matter
1
2
_
3
2
-
19
27
13
Thermodynamics
1
1
_
4
3
-
12
21
14
Kinetic Theory
-
-
1
1
4
7
13
12
8
1
33
35
109
203
SUB TOTAL
TOTAL
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21
73
2
5
MOTION IN A STRAIGHT LINE
Short Answer Questions :
1.
2.
3.
Derive the equation x  v0t  1/ 2 at 2 using graphical method where the terms have
usual meaning. (June-2011)
Explain the terms the average velocity and instantaneous velocity. When are they equal
?
A particle moves in a straight line with uniform acceleration. Its velocity at time t = 0
is V1 and at time
t = t is V2 . The average velocity of the particle in this time interval is  V1  V2  / 2 . Is
this correct? Substantiate your answer.
4.
A ball is dropped from the roof of a tall building and simultaneously another ball is
thrown horizontally with some velocity from the same roof. Which ball lands first?
Explain your answer.
5.
A parachutist flying in an aeroplane jumps when it is at a height of 3 km above ground.
He opens his parachute when he is about 1 km above ground. Describe his motion.
6.
Can the velocity of an object be in a direction other than the direction of acceleration of
the object? If so, give an example.
MOTION IN PLANE
Short Answer Questions :
7.
State Parallelogram law of vectors. Derive an expression for the magnitude and
direction of the resultant vector.(Mar- -05, -9, 10, May-05,06,09, June -2010)
8.
Show that the maximum height reached by a projectile launched at an angle of 450 is
one quarter of its range.
9.
Show that the maximum height and range of a projecticle
are
U 2 sin 2 
U 2 sin 2
and
2g
g
respectively. Where
the terms have their regular
10.
meanings.(MAR-2012)
Define unit vector, null vector and position vector.(MAR-08, MAY-97,SEP-2000)
11.
If a  b  a  b prove that the angle between a and b is 900 .
12.
Show that the trajectory of an object thrown at certain angle with the horizontal is a
parabola.(MAR-09)
13. Show that a boat must move at an angle with respect to river water in order to cross the
river in minimum time?
14. A bird holds a fruit in its beak and flies parallel to the ground. It lets go of the fruit at
some height. Describe the trajectory of the fruit as it falls to the ground as seen by
a) the brid
b) a person in the ground
15. What is relative motion. Explain it ?
LAW OF MOTION
Long Answer Questions :
a) State Newton’s second law of motion. Hence derive the equation of motion F = ma
from it.(MAR-13
b) A body is moving along a circular path such that its speed always remains constant.
Should there be a force acting on the body?
Short Answer Questions :
16. Explain advantanges and disadvantages of friction.(MAR-06)
1.
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17.
18.
19.
20.
Mention the methods used to decrease friction.(MAR-09,MAY-08, JUNE-11)
Why is pulling the lawn roller preferred to pushing it?(MAR-06,-8,10,JUNE-10)
Why are shock absorbers used in motor cycles and cars?
Define the terms momentum and impulse. State and explain the law of conservation of
linear momentum. Give examples.
21. State the laws of rolling friction.
22. Explain the terms limiting friction, dynamic friction and rolling friction.
Work, Energy and Power
Long answer Questions :
2.
a) State and prove law of conservation of energy in case of freely falling body.
(MAR-05,06,09,11,13,May-09,June-2011)
b) A machine gun fires 360 bullets per minute and each bullet travels with a velocity
of 600ms-1. If the mass of each bullet is 5gm. Find the power of the machine gun.
3.
Develop the notions of work and kinetic energy and show that it leads to work –energy
theorem.
4.
What are collissions? Explain the possible types of collisions ? Develop the theory of
one dimentional elastic collision.
Short Answer Questions:
23. Show that in the case of one dimensional elastic collision, the relative velocity of
approach of two colliding bodies before collisions is equal to the relative velocity of
separation after collision.
(MAR-05,06)
24. What is potential energy ? Derive an expression for the gravitational potential energy.
25. Distinguish between conservative and non-conservative forces with one example each.
26. Explain the law of conservation of energy?
Systems of Particles and Rotational Motion
Long Answer Questions
5.
a) State and prove parallel axes theorem. (MAR-07,10,MAY-08,JUNE-2010,MAY-12)
b) For a thin flat circular disk, the radius of gyration about a diameter as axis is k. If the
disk is cut along a diameter AB as shown in to two equal pieces, then find the radius of
gyration of each piece about AB.
6.** a) State and prove perpendicular axes theorem. (MAR-06,09,MAY-08,MAR,JUN-2011,MAY12)
(b) If a thin circular ring and a thin flat circular disk of same mass have same moment
of inertia about their respective diameters as axes. Then find the ratio of their radii
7.
State and prove the principle of conservation of angular momentum. Explain the
principles of conservation of angular momentum with examples.(MAR-08)
Short Answer Questions:
27. Distinguish between centre of mass and centre of gravity.(MAR-13)
28. Define angular acceleration and torque. Establish the relation between angular
acceleration and torque.
29. Define vector product. Explain the properties of a vector product with two examples.
30. Define angular velocity   Derive v  r .
31. Explain about the centre of mass of earth-moon system and its rotation around the sun
Oscillations
Long Answer Questions :
1.** Show that the motion of a simple pendulum is simple harmonic and hence derive an
equation for its time period. What is seconds pendulum?(MAR-05,06,13, MAY09,11,JUNE-10,11)
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2.** Define simple harmonic motion. Show that the motion of (point) projection of a particle
performing uniform circular motion, on any diameter, is simple harmonic.(Mar-09,10)
3.
Derive the equation for the kinetic energy and potential energy of a simple harmonic
oscillator and show that the total energy of a particle in simple harmonic motion is
constant at any point on its path
Short Answer Questions:
32. Obtain an equation for the frequency of oscillation of spring of force constant k to
which a mass m is attached.
33. Define simple haromonic motion? Give two examples.
34. Derive an expressions for displacement, velocity and acceleration of a particle executes
SHM.
GRAVITATION
11.* Derive an expression for the variation of acceleration due to gravity (a) above and (b)
below the surface of the earth.
12. State Newton’s universal law of Gravitational, explain how the value of the
Gravitational constant (G) can be determined by cavendish method.
13.
Define gravitational potential energy and derive an expression for it associated with
two particles of masses m1 and m2 .
Short Answer Questions:
35.
36.
37.
38.
39.
40.
What is escape velocity ? Obtain an expression for it (MAR-05,-07, 08,09,10,13,
MAY-09)
What is orbital velocity ? Obtain an expressin for it (MAR-11, JUN-10)
What a geostationary satellite ? State its uses (MAR-12)
State Kepler’s laws of planetary motion.
How does the acceleration due to gravity (g) change for the same values of height (h)
and depth(d)
Derive the relation between acceleration due to gravity (g) at the surface of a planet
and Gravitional constant (G) (MAY-2012)
MECHANICAL PROPERTIES OF SOLIDS
Long Answer Questions :
Define Hooke’s law of elasticity and describe and experiment to determine the
Young’s modulus of the material of a wire (MAR -05,06,07,11)
Short Answer Questions:
41. Describe the behavior of a wire under gradually increasing load.(MAR-05,06,07,11,13,
14.
MAY-08,JUN-11)
42.
Explain the concept of Elastic potential energy in a stretched wire and hence obtain the
expression for it
43.* Define Hooke’s Law of elasticity, proportionality limit, permanent set and Breaking
stress
44. Define modulus of elasticity, stress, strain and poisson’s ratio
45. Define Young’s modulus, Bulk modulus and shear modulus.
46.* Define stress and explain the type of stress.
47. Define strain an explain the types of strain.
Mechanical Properties of Fluids
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Long Answer Questions :
15. State Bernoulli’s principle. From conservation of energy in a fluid flow through a tube ,
arrive at Bernoulli’s equation. Give an application of Bernoulli’s theorem. (MAR-10)
Short Answer Questions:
48. Explain Surface Tension and Surface energy. (MAR-13)
49.* Explain Dynamic lift with examples.
50* What is Torricelli’s law? Explain how the speed of efflux is determined with an
experiment
51. Explain how surface tension can be measured expermintally?
52.* Explain hydraulic lift and hydraulic brakes.
53.* What is atmospheric pressure and how is it determined using Barometer ?
54.** What is Reynolds number ? What is the significance ?
55.* What is gauge pressure and how is a manometer used for measuring pressure
differences ?
56 What is hydrostatic paradox?
THERMAL PROPERTIES OF MATTER
Long Answer Questions :
16.** State Boyle’s law and Charle’s law. Hence, derive ideal gas equation. Which of the two
laws is better for the purpose of thermometry and why ?(MAR-05, 06,09,(MAY-05,09)
17.* State and explain Newton’s law of cooling. State the conditions under which Newton’s
law of cooling is applicable. A body cools down from 600C to 500C in 5 minutes and
to 450C in another 8 minutes. Find the temperature of the surroundgins.(MAR-11)
18. Explain thermal conductivity and coefficient of thermal conductivity. A copper bar of
thermal conductivity 401 W/(mk) has one end at 1040C other end at 240C. The length
of the bar is 0.10m and the cros sectional area 1.0 106 m2 is what is the rate of heat
conduction, along the bar?
Short Answer Questions:
57.** In what why is the anomalous behaviour of water advantageous to aquatic animals
?(MAR-09,10,MAY-09)
58.** Pendulum clocks generally go fast in winter and slow in summer . Why?
59. What is triple point Explain ? (MAR-13)
60. Explain Celisius and Fahrenheit scales of temperature. Obtain the relation between
Celsius and Faherenchiet scales of temperature.
61.**Explain conduction, convection and radiation with examples.
THERMODYNAMICS
Long Answer Questions :
19.* Explain reversible and irreversible process. Describe the working of Carnot engine.
Obtain an expression for the efficiency.
20.* State second law of the thermodynamics. How is heat engine different from a
refrigerator.(MAY-08,MARCH-13)
Short Answer Questions:
62. Derive a relation between the two specific heat capacities of gas on the basis of first
law of thermodynamics.(MAY-05, -6,09,JUN-11)
63. Obtain an expression for the work done by an ideal gas during isothermal change.
64. Obtain an expression for the work done by an ideal gas during adiabatic change and
explain.
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65.
66.
67.
68.
State and explain first law of thermodynamics
Define two principle specific heats of a gas. Which is greater and why?
Explain qualitatively the working of a heat engine.(MAR-08)
Compare isothermal and an adiabatic process.
KINETIC THEORY
Long Answer Questions :
21.
Derive an expression for the Pressure of an ideal gas in a container from Kinetic Theory
and hence give Kinetic interpretation of Temperature.
Short Answer Questions:
69. How specific heat capacity of Mono atomic, diatomic and Poly atomic gases can be
explained on the basis of law of equipartition of energy ?
70. Explain the kinetic interpretation of Temperature.
71. Explain the concept of absolute zero of temperature on the basis of kinetic theory?
72. What is the ratio of r.m.s speed of Oxygen and Hydrogen molecules at the same
temperature.
73. If a gas has ‘f’ degrees of freedom, find the ratio of C p and Cv .
Very Short Answer Questions:
Physics World
1.
2.
3.
What are the fundamental forces in nature
What is the disocovery of C.V. Raman?
What is the contribution of S. Chandra Sekhar to Physics ?(MAR-2013)
Units and Measurements
4.
5.
6.
7.
8.
Distinguish between accuracy and precision.(MAR-2013)
What are the different types of errors that can occur in a measurement ?
Distinguish between fundamental units and derived units.
What is dimensional analysis ?
Express unifed atomic mass unit in kg
9.
The velocity of a body is given by v  At 2  Bt  C. If v and t are expressed in SI.
What are the units of A,B and C?(MAY.2007)
State the number of significant figures in the following :
1) 6729
2) 0.024
3) 0.08240
4) 6.032
8
5) 4.57  10
10.
Motion in a Straight line
11.
12.
13.
The states of motion and rest are relative explain ?
How is the average velocity different from instantaneous velocity ? (MAR-2013)
Give an example where the velocity of an object is zero but the acceleration is not zero.
(MAR-2013)
14.
A vehicle travels half the distance L with speed V1 and the other half with speed V2.
What is the average speed ?
Motion in a Plane
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15.
16.
17.
The vertical component of a vector is equal to its horizontal component. What is the
angle made by the vector with x-axis.
A vector makes an angle with the horizontal. The vector is rotated through an angle .
Does this rotation change the vector v ?
Two forces of magnitudes 3 units and 5 units act at 600 with each other. What is the
magnitude of their resultant ?
18.
A  i  j , What is the angle between the vector and x-axis. (MAR-2013)
19.
If P  2iˆ  4 ˆj  14kˆ and Q  4iˆ  4 ˆj  10kˆ
20
21
What is the acceleration of a projectile at the top of its trajectory ?
Can vectors of magnitude zero have a nonzero components?
Laws of Motion
What is inertia ? What gives the measure of inertia ?
When a bullet is fired from a gun, the gun gives a kick in the back ward direction.
Explain
Why does a heavy rifle not recoil as strongly as a light rifle using the same
cartridges?
If a bomb at rest explodes into two pieces, the pieces must travel in opposite
directions. Explain.
Define force. What are the basic forces in nature ?
Can the coefficient of friction be greater than one ?
Why does the car with a flattened tyre stop sooner than the one with inflated
tyres?(MAY-11)
A horse has to pull harder during the start of the motion than later. Explain ?(MAR-13,
MAY-09)
What happens to coefficient of friction if weight of the body is doubled ?
Work, Energy And Power
State the conditions under which a force does no work ?
Define : Work, Power and Energy. State their SI units. (MAR-2011)
State the relation between the kinetic energy and momentum of a body
State the sign of work done by a force in the following
a) work done by a man in lifting a bucke out of a well by means of a rope tied to the
bucket.
b) work done by gravitational force in the above case
State the sign of work done by a force in the following
a) work done by friction on a body sliding down an inclined plane.
b) work done by gravitational force in the above case
Which physical quantity remains constant
i) In an elastic collision
ii) In an inelastic collision ?
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
and find the magnitude of P  Q
System of Particles and Rotational Motion
37.
38.
39.
Is it necessary that a mass should be present at the centre of mass of any system
?(MAR,JUN-11,MAY-12)
Why are spokes provided in a bicycle wheel ?
We cannot open or close the door by applying force at the hings. Why?
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40
41.
42.
43.
44.
45.
46.
47.
48.
By spinning eggs on a table top, how will you distinguish a hard boiled egg from a
raw egg ?(MAR-13)
If the polar ice caps of the earth were to melt, what would the effect of the length of
the day be?
Why is it easier to balance a bicycle in motion ?
Oscillation
Give two examples of periodic motion which are not oscillatory.
The displacement of S.H.M is given by y = a sin (20t + 4). What is the displacement
when it is increased by 2 ?

A girl is swinging seated in a swing. What is the effect on the frequency of oscillation if
she stands ?
The bob of a simple pendulum is a hollow sphere filled with water. How will the
period of oscillation change, if the water begins to drain out of the hollow sphere ?
Will a pendulum clock gain or lose time when taken to the top of a mountain ?
A pendulum clock give, correct time at the equator. Will gain or lose time if it is taken
to the poles ? If so, why ?
Gravitation
49.
50.
51.
52.
53.
54.
55.
56.
State the unit and dimension of universal gravitational constant (G)
State the vector form of Newton ’s law of gravitation
As we go from one planet to another planet, how will (a) the mass and (b) weight of a
body changes?
Give the equation for the value of g at a depth ‘d’ from the surfaces of earth. What is
the value of g at the centre of earth ?
What are the factors that make ‘g’ the least at the equator and maximum at the poles ?
“Hydrogen is an abundance around the sun and not a around the earth” Explain. (JUNE-11)
What is the time period of revolution of a geostationary satellite? Does it rotate form West to East
or from East to West
What are polar satellites ?
MECHANICAL PROPERTIES OF SOLIDS
57.
58.
59.
60.
61.
62.
State Hooke’s law of elasticity.
State the examples of nearly perfect elastic and plastic bodies.
A copper wire of 1 mm diameter is stretched by applying a force of 10N. Find the stress in the
wire.
A tungsten wire of length 20 cm is stretched by 0.1cm. Find the strain on the wire.
If an iron wire is stretched by 1% what is the strain on the wire?
A steel wire of length 20 cm is stretched to increase its length by 0.2cm. Find the lateral strain
in the wire if the Poisson’s rule for steel is 0.19 (MAR 2009)
Mechanical Properties of fluids
63.
64.
65.
66.
67.
68.
69.
70.
Define average pressure- Mention it’s unit and dimensional formula. Is it a scalar or a vector ?
Define Viscosity. What are it’s units and dimensions?(MAR-12)
What is magnus effect ?
Why are drops and bubbles spherical ?(MAR-09)
Give the expression for the excess pressure in a liquid drop
Give the expression for the excess pressure in an air bubble inside the liquids.
Give the expression for the soap bubble in air
What are water proofing agents and water wetting agents ? What do they do ?
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71.
What is angle of contact ?
72.
73.
74
Distinguish between heat and temperature
What are the lower fixed point and upper fixed points in Celsium and Fahrenheit scales ?
Do the values of coefficients of expansion differ, when the temperatures are measured on
centigrade scale or on Fahrenheit scale ?
Can a substance contract on heating ? Give examples. (MAR-11,12)
What is latent heat of fusion ?
What is latent heat of vaporuisation ?(MAR-13)
What is specific gas constant ? Is it same for all gases ?
What are units and dimensions of specific gas constant ?
Why utentisils are coated black? Why bottom of the utensils are made of copper ?
State Wein’s displacement law
Thermal properties of Matter
75.
76.
77.
78.
79.
80.
81.
82.
83.
84.
85.
86.
87.
88.
89.
90.
Ventilators are provided in rooms just below the roof. Why ?
What is thermal resistance of a conductor ? On what factors does it depend?
State the units and dimensions of coefficient of convection.
Define emissive powers and emissivity.
What is greenhouse effect? Explain global warming.
Define absorptive power of a body. What is the absorptive power of perferct black
body.
State Newton’s law of cooling
State the conditions under which Newton’s law of cooling is applicable.
The roof buildings of often painted white during summer. Why?
THERMODYNAMICS
91.
92.
93.
94.
95.
96.
97.
98.
99.
100.
101.
102.
103.
104.
105.
106.
Define Thermal equilibrium. How does it lead to Zeroth Law of Thermodynamics?
Define Caloric. What is the relation between calorie
What thermodynamic variables can be defined by a) Zeroth law b) First law ?
Define specific heat capacity of the substances On factors does it depend ?
Define molar specific heat capacity
For a solid, what is the total energy of an oscillator ?
Why does the brake drum of an automobile get heated up while moving down at
constant speed ?
Can a room be cooled by leaving the door of an electric refrigerator open
A thermos flask containing a liquid is shaken vigorously. What happens to its
temperatures ?
A sound wave is sent into a gas pipe. Does it internal energy change ?
How much will be the internal energy change in
i) isothermal process ii) adiabatic process
What are the values of specific heat capacity in
a) adiabatic system
b) Iso thermal system (mar-2011, may-2011)
KINETIC THEORY
Define mean free path.
Name two prominent phenomena which provide conclusive evidence of molecular
motion.
When does a real gas behave like an ideal gas?
State Boyle’s law and Charles law.
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107. State Dalton’s law of partial pressures.
108. Explain the concept of degrees of freedom for molecules of a gas
109. What is the expression between pressure and kinetic energy of a gas molecule?
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