श्री गणेशाये नमः | No work can be worthy and fruitful without the blessings of God so by the following mesmerising shlokas of Shree Ramcharit Manas, I am praying the Lord Shree Ram to provide me the strength to write a worthy book for the Students. वर्णा नणमर्ा संघणनणं रसणनणं छन्दसणमपि। मंगलणनणं च कर्त्णा रौ वन्दे वणर्ीपवनणयकौ॥1॥ भवणनीशं करौ वन्दे श्रद्धणपवश्वणसरूपिर्ौ। यणभ्णं पवनण न िश्यन्ति सप ि् धणाः स्वणिाः स्र्मीश्वरमि् ॥2॥ वन्दे बोधमयं पनत्यं गुरं शंकररूपिर्मि् । यमणपश्रतो पह वक्रोऽपि चन्द्राः सवात्र वन्द्यते॥3॥ सीतणरणमगुर्ग्रणमिु ण्यणरण्यपवहणररर्ौ। वन्दे पवशु द्धपवज्ञणनौ कवीश्वरकिीश्वरौ॥4॥ उद्भवन्तस्र्पतसं हणरकणररर्ीं क्लेशहणररर्ीमि् । सवा श्रेयस्करीं सीतणं नतोऽहं रणमवल्लभणमि् ॥5॥ यन्मणयणवशवपता पवश्वमखपलं ब्रह्मण प े वणसुरण यत्सत्त्वण मृषैव भणपत सकलं रज्जौ यर्णहे र्भ्ामाः । यत्पण प्लवमेकमेव पह भवणम्भोधेन्तितीषणा वतणं वन्दे ऽहं तमशे षकणरर्िरं रणमणख्यमीशं हररमि्॥6॥ नणनणिु रणर्पनगमणगमसम्मतं य ि् रणमणयर्े पनगप तं क्वचप न्यतोऽपि। स्वणिाः सु खणय तु लसी रघुनणर्गणर्ण भणषणपनबन्धमपतमंजुलमणतनोपत॥7॥ श्री सीता राम हनुमान|
5
PHYSICS AIRFORCE GROUP X
CONTENTS ACKNOWLEDGEMENT
i
1
MOTION IN STRAIGHT LINE
3
2
MOTION IN A PLANE
9
3
LAWS OF MOTION
18
4
WORK POWER ENERGY
29
5
GRAVITATION
35
6
FLUID MECHANICS
41
7
ELECTROMAGNETIC WAVE
52
8
GEOMETRICAL OPTICS
58
9
CURRENT ELECTRICITY
72
10
THERMAL PROPERTIES OF MATTER
82
11
THERMODYNAMICS
94
12
MAGNETISM
99
13
ELECTROMAGNETIC INDUCTION
107
14
SIMPLE HARMONIC MOTION
111
15
WAVE
116
16
ELECTROSTAT
119
17
ALTERNATE CURRENT
123
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SHREE RAM CHANDRA|VIKAS SINGH
18
WAVE OPTICS
127
19
SYSTEM OF PARTICLES AND ROTATION
130
20
DUAL NATURE OF RADIATION AND MATTER
133
21
ATOMS
135
22
SEMICONDUCTORS AND DEVICES
137
23
LOGIC GATES
139
8
ACKNOWLEDGMENTS I would like to thanks everyone who have contributed in this book in one way or another.A special thanks to the students who were having great problem solving and spotting the error skill.They contributed in minimising the error from this book. A special thanks to my family which always provided me the space of mind and time to write a great book.
Nothing can be done without the blessing of the god so I believe the flow of the topic and the results generated by this book is because of blessing of Lord Rama.
1
CHAPTER 1 MOTION IN STRAIGHT LINE 1.Distance and Displacement 1.If a person start its motion from a corner of a square of side 10m and takes 2.5 revolution what will be the distance travelled by the person? A)80m B)100m C)50m D)90m 2.In the above question what will be the value of the Displacement? A)zero B)20m C)10√2m D)100m 3.Four point A,B,C and D are equidistant on the circumference of a circle of radius 2 m.If a person start from point A and takes 3.75 revolution in clockwise direction then what will be the value of Displacement? A)4m B)2m C)2√2m D)Zero 4.In the above question what will be the value of Displacement when the number of revolution is increase to 3145.75 Revolution? A)4m B)2m C)2√2m D)Zero
2.Average Velocity and Average Speed 5.If a person travel half of the distance of his total journey with speed V1 and remaining distance with speed V2 then what will be the average speed of his total journey? A)2V1V2/(V1+V2) B)3V1V2/(V1+2V2) C)3V1V2/(2V1+V2) D)None of these 6.If a person travel one third distance of his total journey with speed V1 and 3
SHREE RAM CHANDRA|VIKAS SINGH
remaining distance with speed V2 then find the average speed of his total journey? A)2V1V2/(V1+V2) B)3V1V2/(V1+2V2) C)3V1V2/(2V1+V2) D)None of these 7.If a person travel half of the time of his total journey with speed V1 and remaining time with speed V2 then find the average speed of his total journey? A)2V1V2/(V1+V2) B)3V1V2/(V1+2V2) C)3V1V2/(2V1+V2) D)(V1+V2)/2 8.If a person travel from one point to another point in a semicircular path with speed V then find the value of average velocity? A)V/2 B)2V/π C)π/2V D)V/π
3.Uniform Motion 9.Which of the following is a example of uniform motion? A)A car moving on a circular path with the constant speed of 10m/s. B)A football striking a wall with 10m/s and returning with the same speed. C)A car travelling to east with 10m/s and takes turn towards north with the same Speed. D)A car moving with 10m/s in a straight line
4.Uniform Acceleration 10.A car moving with the speed of 50 km/h can be stopped by brakes after at least 6m.If the same car is moving at a speed of 100 km/h,the minimum stopping distance is A)12m B)18m C)24m D)6m 11.A ball is released from the top of a tower of height h meters.It takes T seconds to reach the ground.What is the position of the ball in T/3 seconds? A)h/9 meters from the ground B)7h/9 meters from the ground C)8h/9 meters from the ground. D)17h/18 meters from the ground 12.A ball is dropped from the top of a building 100m high.At the same instant 4
PHYSICS AIRFORCE GROUP X
another ball is thrown upwards with a velocity of 40 m/s from the bottom of the building.The two balls will meet after A)3 Sec B)2 Sec C)2.5 Sec D)5 Sec 13.A bullet fired into a fixed target loses half of its velocity after penetrating 3cm.How much will it penetrate further before coming to rest assuming that it faces constant resistance in motion? A)1.5 cm B)1.0 cm C)3.0 cm D)2 cm 14.A bullet loses its 1/20 part of the velocity after penetrating in to a wooden plank.How many such planks are required to stop the bullet completely?(Assume the resistance offered by the wooden plank to be constant) A) 20 B)15 C)11 D)10 15.The body A starts from rest with an acceleration a1.After 2 sec,another body B starts from rest with an acceleration a2.If they travel equal distance in the 5th Second after the start of A,then the ratio a1:a2 is equal to A)5:9 B)5:7 C)9:5 D)9:7 16.Two balls are dropped from a tower at an interval of 1 second as time progress the distance between them will A)Increase B)Remain Constant C)Decrease D)Can’t Say 17.In Question 16 what will happen to the difference between their speed as the time progresses A)Increase B)Remain Constant C)Decrease D)Can’t Say 18.A ball is thrown in the upward direction and it is at same height at 3rd second and 7th second during its motion in the air then the velocity with which it was projected is A)40m/s B)50m/s C)60m/s D)80m/s 19.A ball is dropped from a certain height and free falls for 5 second thereafter it collide with a glass table and looses its half of the speed after breaking the table.If it take 1 second to reach on the ground after breaking the table then find the height of the table A)40m B)30m C)50m D)60m 20.If a ball is thrown straight up in the air from the top of a building of height 80m with the speed of 30m/s then find the total time taken by the ball when 5
SHREE RAM CHANDRA|VIKAS SINGH
it strikes at the bottom of the building A)6 Second B)8 Second C)10 Second
D)12 Second
21.In the question number 20 what will be the speed of the ball with which it will collide on the ground A)40m/s B)50m/s C)60m/s D)80m/s 22.A car moves with constant acceleration and crosses a point A with speed 30km/h and crosses another point B ahead of A in straight line with speed 40km/h then what will be the speed of the car at the mid point of A and B? A)35km/h B)70km/h C)25√2km/h D)30√2km/h 23.A train is moving with constant acceleration.If its engine crosses a pole on the station when the speed is 20km/h and its mid point crosses the same pole when the speed is 40km/h then what will be the speed of the train when last wagon crosses the same pole? A)20√7km/h B)60km/h C)50km/h D)30√7km/h
5.Graph 24..If the velocity time graph of an object is the horizontal line then the the object is moving with A)Uniform acceleration B) Changing Velocity C)Non Uniform acceleration D)Zero Acceleration 25.If the position time graph of an object is the parabola then the object is moving with A)Uniform acceleration B) Changing Velocity C)Non Uniform acceleration D)Zero Acceleration 26.If the velocity time graph of an object is parabola then the object is moving with A)Uniform acceleration. B) Changing Velocity C)Non Uniform acceleration D)Zero Acceleration 27.If the velocity time graph of an object is straight line with some slope then the object is moving with A)Uniform acceleration. B) Changing Velocity C)Non Uniform acceleration. D)Zero Acceleration 28.The displacement -time graph of a moving particle is shown below.The 6
PHYSICS AIRFORCE GROUP X
instantaneous velocity of the particle is negative at the point
A) C.
B) D.
C) A
D) B
29.Which of the following graphs represent an object having zero acceleration?
A) only graph a C) graphs a and b
B) only graph b D) graphs b and c
30.Area of the acceleration time graph will provide A)Displacement B)Velocity C)Change in Velocity D)No any Quantity 31.Velocity-Displacement graph of a body starting from rest and then moving with constant acceleration will be A) Straight line passing through origin B) Parabola having velocity as its axis C)Parabola having displacement as its axis D)A circular Arc
6.Non Uniform Motion 32.If the displacement of a particle is proportional to the cube of the time 7