Physics 11 keypoints

400 Physics Main Points

S.NO	QUESTIONS	ANSWERS
1)	When force is applied on body its mass remains	Constant
2)	The colours in the soup bubble are due to	interference
3)	An object in satellite orbiting around earth is weightless because	Its motion is free fall
4)	The transverse nature of light is verified with the phenomenon of	polarization
5)	The uncertainty recorded in radius of sphere is 1.6% .uncertainty in area of sphere is	3.2% (Area=πr²)
6)	The velocity of projectile at its maximum height is	Zero
7)	10.00300 ,no of significant figures are	7
8)	Two equal, anti parallel and non concurrent forces that produce only angular acceleration are	Couple
9)	The minimum number of forces that keep the body in equilibrium are	2
10)	A ball of mass 5 kg is dropped from a height of 78.4m the time taken by the ball to hit the ground is	4 sec
11)	Hook's law correlates the force and	Extension
12)	MRI works on principle of	Resonance
13)	Mass	Scalar
14)	Acceleration, momentum, electric intensity	Vector
15)	A car of mass 1000kg first travel on 25ms and then on 5ms,the change in K.E is	300kj
16)	Train apply brakes from 1 km far from where it stops if its maximum deceleration is 0.2m/s its safe speed now	20m/s
17)	The standard molar enthalpy of formation is denoted by	ΔH⁰₂₉₈
18)	In a stationary wave, the distance between a consecutive node and antinode is
19)	When a wave comes across an obstacle, it bands around the obstacle. This phenomenon of bending around of a wave is called	Diffraction
20)	Process of applying Hess’s law to the standard enthalpy changes in the formation of ionic compounds	Born Haber Cycle
21)	Longitudinal waves cannot be
22)	The mass of a body on planet P is 39kg. what is its weight on planet P is	49N
23)	Momentum is conserved providing no external force act	Principle of conservation of momentum
24)	0.5 A=	500mA
25)	A body in equilibrium must have not	Acceleration
26)	Sound waves cannot be	Polarized
27)	The angle subtended by the circumference of circle at center of circle is	2π radians or 1 rev or360⁰
28)	The angle subtended at the center of the sphere by its surface area =	4π steradian
29)	The magnitude of resultant of two forces is 2F. if the magnitude of each force is F than the angle between these forces is	0⁰
30)	Three vectors of equal magnitude are acting on three sides of an equilateral triangle .the magnitude of their resultant is	zero
31)	Longitudinal waves cannot be	Polarized
32)	If the length of simple pendulum is halved and mass is doubled then its time period	Decreased by 4
33)	When a wave comes across an obstacle, it bands around an obstacle. This phenomenon is called	Diffraction
34)	A man throws a ball vertically in accelerated train, he ball will fall in	His hand
35)	The property of moving object by virtue of which it exerts force on the objects that tries to stop it is	Inertia of the body
36)	1hp =	746 watts
37)	The dot product of force and velocity is called	Power
38)	The escape velocity from the earth gravitational field depends on	Radius of earth and g
39)	Coal, oil, natural gas	Non-Renewable natural Sources
40)	energy from biomass and waves, electrical energy, geothermal energy, nuclear energy, tidal energy, solar energy, wind energy	Renewable Energy Sources
41)	If velocity of body becomes half, the K.E of body becomes	One fourth
42)	A jet drops a bomb when it is above the target but it miss it due to	Horizontal component of the velocity of bomber
43)	The geostationary satellites are rotating with the speed of	Earth
44)	A two meter tank is full of water, a hole in its middle is made, the speed of effect is	4.42ms
45)	The magnitude of periodic force, which the simple pendulum exert on the suspension point depends on	Value of g
46)	Speed of sound in independent to	Pressure
47)	The number of loops in stationary waves depends upon	Frequency of waves
48)	When the light enters from air to glass, it suffers a change in the	Wavelength and speed
49)	Sound around the corner can be hear but cannot be seen due to	Diffraction
50)	The power of objective and eyepiece of telescope is 0.5 diopter and 10 diopter, the magnifying power of telescope is	20 diopter
51)	The process which is performed quickly is	Adiabatic process
52)	Newton’s first law of motion provides	1^st condition of equilibrium
53)	The moment arm of force of 0.6 N to produce maximum torque of 0.48 Nm is	0.8 m
54)	Bodies which fall freely under an action of gravity is an example of	Uniform acceleration
55)	The dimension of work is similar to that of	Torque
56)	The dimension of impulse are similar to	Surface tension
57)	The dimension of Plank’s constant are similar to	Angular momentum
58)	When the drag force of an object becomes equal to its real weight then the object will fall	With terminal velocity
59)	When the length of simple pendulum is increased four times, the frequency of its oscillation will	Half
60)	Frequency of light does not change with	Nature of medium
61)	The phase change of 180⁰ is equal to path difference	Half the wavelength
62)	If the width on the young’s double slit experiment becomes double, the fringe spacing will become	Half
63)	The work done against friction will	Increase the entropy of system
64)	If an ideal gas allowed to expand adiabatically the work done by the gas is equal to	The loss of internal energy
65)	To jump long, a jumper should jump at	45⁰
66)	Doppler effect is applicable to	Sound and light waves
67)	The dimension of plank constant(h) is	[ M L² T^-1 ]
68)	Time period of simple pendulum is one second its length is	0.25 m
69)	Angular acceleration is produced by	Torque
70)	When sound moves from one medium to another its frequency remains	Constant
71)	When a body moves against force of friction on plane the work done is	Negative
72)	A body has mass 72kg on earth, its mass on moon is	72kg
73)	Newton 2^nd law of motion establishes relationship between	Force and acceleration
74)	The device which can be used for measuring precise wavelength is	Michelson interferometer
75)	If tunnel is bored through center of earth and stone is dropped it will	Simple harmonic motion
76)	Gamma rays high penetrating power than alpha and beta due to	No charge
77)	The minimum number of unequal forces whose vector sum can be zero	Three
78)	The dimension of gravitational constant is	[ M^-1 L³ T^-2 ]
79)	Radio, M.R.I, Microwave oven works on phenomenon of	Resonance
80)	The angle between linear and angular velocity is	90⁰
81)	One atto =	10^-18
82)	When drag force on the droplet becomes equal to its real weight, it will fall	With zero acceleration
83)	Elastic collision involves	No gain no loss of energy
84)	The dimension of torque are	[ M L² T^-2 ]
85)	Centripetal force cannot do	Work
86)	The escape velocity of any mass from earth is	11x 10³ m s^-1 Or 11km s^-1
87)	The escape velocity from any planet depends on radius and mass of that	Planet
88)	As the pressure of medium increases the speed of sound in medium	Remains constant
89)	The motion of the source of sound with respect to stationary listener cause change in	Frequency of sound
90)	If the temperature of source of heat increase, The efficiency of carnots engine	Increases
91)	One light year is equal to	9.46 x 10¹⁵ m
92)	Sound waves move faster in	Hydrogen medium
93)	The SI unit of spring constant (k) is identical to	Surface tension
94)	A precise measurement is one which has	Absolute precision
95)	The gravitational potential energy per unit mass is called	Gravitational potential
96)	Time taken by light to reach from sun to earth is	8 min 20 sec
97)	If speed of moving particle increases its wavelength associated with it	Decreases
98)	The velocity of earth satellite can be measured from the change in frequency or radio waves by using	Doppler effect
99)	Increase in entropy of system is increase by	Increase in heating
100)	Photons can move with a speed of	Light
101)	Propagation of light in optical fiber, the light should	Totally confined
102)	The least accurate of the volumetric measuring device is the	Graduated cylinder
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103)	the colour of sky is blue due to		Scattering of light
104)	The potential difference between two points is one volt, the work done by moving one coloumb of charge from one point to another is		One joule
105)	Frequency of light does not depend on		Nature of medium
106)	The refractive index of light in medium and vacume as given by		η =c/v
107)	The ratio of heat accepted to the heat rejected by the carnot engine gives		The efficiency of working substances
108)	The acceleration of falling body in fluid depends upon Velocity, and density of body and		Viscosity of fluid
109)	Two concurrent forces have maximum resultant of 45N and minimum of 5N		These are 20N and 25N
110)	The direction of torque as perpendicular to plane of		Force and radius
111)	Height of projectile		V_i² sin² θ/2g
112)	Range of projectile		V_i² sin2θ/g
113)	Time of projectile		2V_i sin θ/g
114)	Two vectors of same magnitude result vector of same magnitude by		Angle of 120⁰
115)	Rain drop falling from sky reach the ground with		Constant terminal velocity
116)	Two vectors are such that a+b =b+a the angle between them is		90⁰
117)	If green light in young double slit experiment is replaced by monochromatic light of the same intensity, Then fringe width will		Increases
118)	Number of significant figures in 4.0030 are		5
119)	The time period of communication satellite is		24 hour
120)	When Newton’s rings interference….. is seen from above by means of reflection light. The central spot always appears		Black
121)	The orbital velocity of satellite in an orbit around the earth depends upon		Radius of the orbit
122)	The wavelength of sound made from a tuning fork of frequency 330 Hz is nearly		330m (v=f λ)
123)	Ampere hour is unit of		Quantity of charge
124)	The time period of simple pendulum becomes double when it		Length is made four times
125)	The largest demand of energy is generally fulfilled by		Fossil fuels
126)	Two waves of same frequency and amplitude traveling in opposite direction along same position the waves is		Stationary waves
127)	If tension in a string remains constant and diameter becomes double its speed		Will become half
128)	In transverse waves the distance between consecutive crust and trough is		λ/2
129)	To find speed of wave we use		V = f λ
130)	The weight of pilot diving down with acceleration of 9.8 ms^-2 is		Zero
131)	Units of pressure		Atm or pascal or Nm^-2
132)	The present SI unit of time is defined as		Duration of 9.192,631,770 vibration of cesium-133 atoms
133)	The value of G at the moon as compared to earth is		Smaller (one sixth)
134)	Constructive interference occur if path difference between two monochromatic light is		Integral multiple of wavelength
135)	A meter rod is moving with speed of light with respect to stationary observer, the length of the rod will appeared to the observer as		Zero
136)	Power=		Δw/Δt
137)	It is easier to turn a steering by both hands because two hand produce		Couple
138)	Two waves of the same frequency and amplitude, traveling in opposite direction along the same path will form		Standing waves
139)	When light signals travels along the length of the optical fiber, the power lost by it is ,due to		Scattering & Absorption
140)	Net change in entropy of Carnot engine is		Zero
141)	γ- rays have high energy photons than x-rays, Ultra violet and		Visible light
142)	Two boats moving parallel in the same directions will be pulled		Towards each other
143)	If shells explode in the air, its fragments fly off in all direction, its momentum		Remains constant
144)	If material particle start motion with speed of light, the mass of this moving particle will		Become infant
145)	Green house affect is not produced by		Nitrous oxide
146)	The range of projectile is the same for two angles which are mutually		Complementary
147)	The path of projectile is parabolic in shape and is called		Trajectory
148)	A body of mass 1kg is suspended in elevator which is accelerating downward With an acceleration of 4ms² , reading of the balance will be		5.8N
149)	The radio waves of constant magnitude are called		Carrier waves
150)	The world seismology stands for		An instrument used for detecting earthquakes
151)	The process in which heat neither enter nor leave the system but still temperature of the system change is		Adiabatic process
152)	If work is done at rate of 240watt in minute, its power is		4 watt
153)	The work done by an electron revolving with 50m/sec is		Zero
154)	If the length of simple pendulum becomes fore times, its time period will become		Two times
155)	Critical angles of the medium depends on the		Refractive index of the medium
156)	The phase changes of 180⁰ is equivalent to		λ/₂
157)	Newton’s rings are formed due to		Polarization of light
158)	The dimension of angular acceleration is		[T^-2 ]
159)	Motion of the bob of the simple pendulum is slowest at the		Equator of earth
160)	If the coplanar forces acting on the body keep it in the equilibrium then these forces are		Concurrent
161)	LASER light is the result of		Stimulated emission
162)	Gravitational, Electric and Magnetic fields are		Conservative
163)	Intense, Coherent and monochromatic beam of light are produced by		Laser
164)	One hollow and one solid cylinder of same radius are rolling down on inclined plane, which one will reach first to plane?		Solid disc
165)	When an object slides at constant speed down an inclined plane, the co-efficient of friction may		Tan θ
166)	The efficiency of carnot engine of hot and cold temperature depends upon only		temperature of two reservoirs
167)	The force exerted by seat on astronaut if space shuttle is in orbit at radius R from earth’s center		Zero
168)	Rain drops falls with constant speed at the last stage of his falling because		Air resistance just balance force of gravity
169)	If the area of the circle is equal to its circumstance , the radius of the circle is		1
170)	When water reach to an obstacle in the medium, they bend around in obstacle the region behind it, this is the evidence of the phenomenon of		Diffraction
171)	A 2kg object is moving with 3m/s. A force of 10N is applied on it and removed when body moved by 5m. The work done is		50J
172)	A ball is thrown from window of moving train, It hit the ground by		Parabolic path
173)	In order to change momentum of an objective there must be		Force applied
174)	To find time period of simple pendulum we keep amplitude		Small
175)	When longitudinal waves propagate through a medium , the particle of the medium		Vibrate parallel to the direction of wave
176)	In absence of an external torque, the angular momentum of rotating body is		constant
177)	Electromagnetic waves do not require medium for their		Propagation
178)	A cyclist moves 4km toward east and then 3km towards north, how he far from initial point		5km
179)	The process in which a system goes a change of state at constant volume is called		Isochoric
180)	The process in which a system goes a change of state at constant pressure is called		Isobaric
181)	The process in which a system goes a change of state at constant temperature is called		Isothermal
182)	The process in which a system goes a change of state where no heat can enter or leave is called		Adiabatic
183)	If kinetic energy of body is increased by 300%, the increase in momentum is		100%
184)	If x-component of vector is 3x and y-component is -3y the angle of its resultant is		315⁰
185)	The circumference of circle divided by diameter of the circle is called		π
186)	Plane angle subtended at center of circle by an arc of length equal to its radius		Radian
187)	Angle subtended at center of circle by an arc of length 1/360 of the circumference of the circle		Degree
188)	Carelessness, improper knowledge and incorrect reading causes		Personal error
189)	Faulty apparatus or poor calibration and zero error causes		Systematic error
190)	Change in temperature, voltage and humidity error causes		Random/accidental error
191)	Random error is also called		Statistical error
192)	The final result should contain as much significant figure as that contained by		Least significant figure
193)	Magnitude of frictional error or relative error		Accuracy
194)	Force, Energy and acceleration are		Dimensional variable
195)	Light speed in vacuum, plank’s constant, gravitational constant and ideal gas constant are		Dimensional constant
196)	Plane angle, solid angle, strain and co-efficient of friction are		Dimensionless variable
197)	Pure numbers and π are		Dimensionless constant
198)	θ is the angle made with +X direction in		Anticlockwise Sense
199)	If both R_x and R_y are positive the θ lies in		I Quadrant
200)	If R_x is positive and R_y is negative the θ lies in		II Quadrant
201)	If both R_x and R_y are negative the θ lies in III Quadrant
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202)	If R_x is negative and R_y is positive the θ lies in		IV Quadrant
203)	A . B = AB		Cosθ
204)	A x B = AB		Sinθ
205)	Scalar product (work and power) is also called		Dot product
206)	Vector product (torque) is also called		Cross product
207)	ABCosθ, here A is magnitude of 1^st vector while B is that component of B which is		Parallel to A
208)	ABSinθ, here A is magnitude of 1^st vector while B is that component of B which is		Perpendicular to A
209)	The point of rotation in torque is called		Fulcrum or Pivot
210)	Torque is rotational analogue of		Force
211)	For concurrent forces, the line of action of are		Common
212)	If 1^st condition is satisfied the body will be in translational equilibrium and there will be no		Linear acceleration
213)	If 2^nd condition is satisfied the body will be in translational equilibrium and there will be no		Rotational Acceleration
214)	If both condition are satisfied the body has		Zero acceleration
215)	Difference of two vectors divided by scalar must also be		Vector
216)	Deceleration is also called		Retardation
217)	Displacement-time graph is called		Velocity
218)	Displacement-time graph may be		Negative
219)	Distance-time graph can never be		Negative
220)	Slope or gradient of v-t graph is called		Acceleration
221)	Area under v-t graph is called		Distance traveled
222)	Free fall motion is		9.8 ms^-2 or 32 ft s^-2
223)	Newton’s first law of motion is also known as		Law of inertia
224)	Newton’s second law of motion		F=ma
225)	Newton’s third law of motion		F_AB = -F_BA
226)	Linear momentum was called quantity of motion by		Newton
227)	The rate of change of momentum is equal to		Force acting on body
228)	The product of F and t is called impulse of force, represented by		J
229)	In an elastic collision both kinetic energy and momentum is		Conserved
230)	In an inelastic collision momentum is conserved but kinetic energy is not		Conserved
231)	The type of collision in which before and after collision appear on singe line		Head-on collision
232)	The relative speed of approach is equal to relative speed of separating for two		Bodies colliding elastically
233)	Projectile motion is two dimensional under an action of		Gravity
234)	The vertical component of velocity in projectile in highest is		Zero
235)	The horizontal component of velocity of projectile remains		Constant
236)	In projectile motile motion the upward quantities are taken		Positive
237)	In projectile motile motion the downward quantities are taken		Negative
238)	If θ<90⁰ then work done will be		Positive
239)	If θ=90⁰ then work done will be		Zero
240)	If θ>90⁰ then work done will be		negative
241)	The gravitational force per unit mass on the body is known as		Gravitational field constant
242)	In closed path when work done is zero then it is called		Conservative
243)	The space around the earth in which it exerts a force of attraction on bodies		Gravitational field
244)	Sin0=		0
245)	Cos0=		1
246)	Sin90=		1
247)	Cos90=		0
248)	The work done is independent to the path followed by a body in		Close path
249)	Frictional force is		Non-conservative
250)	Amount of work done by a body in one second		Power
251)	The product of force and velocity(f x v) is called		Power
252)	The unit of power is called		Watt (1 watt=Js^-1)
253)	1kwh = 1000 watts x 3600 sec =		3.6 mega joule
254)	1hp =		746 watts
255)	The ratio of output and input of machine is called		Efficiency
256)	Ideal machine is that of which		Output = Input
257)	K.E is the work done against		Frictional force
258)	P.E is the work done against		Gravity
259)	The value of escape velocity from earth is		11.2 x 10³ m s^-1
260)	The value of escape velocity from moon is		2.3 x 10³ m s^-1
261)	The velocity of light(c) is		3 x 10⁸ m s^-1
262)	The softest coal(50% carbon) which has lowest energy output is called		Lignite
263)	Crude oil is also called		Liquid petroleum
264)	The center of the earth is approximately		4000⁰ C
265)	The electricity provided to the world by nuclear energy is		16%
266)	Centripetal force is also called		Seeking force
267)	Moment of inertia or rotational inertia(I) is equal to		mr²
268)	In absence of external torque the angular momentum of system remains		Constant
269)	The minimum required velocity to put a satellite into the orbit is called		Critical velocity (7.9 km^-1)
270)	The speed of satellite is inversely proportional to its		Radius
271)	The time which is taken by geostationary satellite or geosynchronous to complete round around the earth is		24 hours
272)	The geostationary orbit has an altitude of		22,240 miles (35,790 km)
273)	The geostationary orbit has an speed of		6,880 mph (11,070 kmh^-1)
274)	The radius of geostationary satellite from center of the earth is		4.23 x 10⁴ km
275)	The radius of the earth is		6.4 x 10⁶ m
276)	A body weight in upward moving lift		Increases
277)	A body weight in lift at rest is		Constant
278)	A body weight in downward moving lift		Decreases
279)	A body weight in freely falling lift is		Zero
280)	When satellite is falling freely everything in this appears to be		Weightless
281)	The drag force increases with increase with		Speed of the object increase
282)	The resistance offered by fluids to the motion of the objects is called		Viscous drag
283)	When the drag force is equal to body weight then the body continues to fall		At steady speed
284)	The terminal velocity is directly proportional to square of		radius
285)	For ideal liquid the fluid motion is always		Laminar
286)	Mass flow into the volume must be equal to the mass flow rate out		Equation of continuity
287)	Area of pipe x velocity of fluid =		Constant
288)	The speed of fluid through pipe is inversely proportional to the		Area of the pipe
289)	The relationship between pressure, flow speed and for flow of ideal fluid is		Bernoulli’s equation
290)	When a particle execute repeated movement about a mean position, it is		Harmonic motion
291)	If a motion is repeated at regular intervals, it is called		Periodic motion
292)	The number of vibration completed by a body in one second is called		Frequency
293)	The unit of frequency is		Hertz / 1Hz / 1cs^-1 / cps
294)	The number of revolution per second of a body is called		Angular frequency
295)	In S.H.M the negative sign shows that both acceleration and displacement are		Oppositely directed
296)	Length of string + length of radius of metallic bob =		Length of simple pendulum
297)	The longer the pendulum the greater will be its		Time period
298)	The time period of simple pendulum is independent to the		Mass of the bob
299)	The number of vibration completed by a body in one second is called		Frequency
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300)	The unit of frequency is		Hertz / 1Hz / 1cs^-1 / cps
301)	The number of revolution per second of a body is called		Angular frequency
302)	In S.H.M the negative sign shows that both acceleration and displacement are		Oppositely directed
303)	Length of string + length of radius of metallic bob =		Length of simple pendulum
304)	The longer the pendulum the greater will be its		Time period
305)	The time period of simple pendulum is independent to the		Mass of the bob
306)	At extreme position K.E is		Zero
307)	At mean position K.E is		Maximum
308)	At extreme position the P.E is		Maximum
309)	At mean position the P.E is		Zero
310)	Law of conservation of energy is conserved in case of		S.H.M
311)	The angle θ= which specifies the displacement x as well as the direction of the motion of the point oscillating S.H.M is called		Phase
312)	Oscillations where amplitude becomes smaller and smaller with time are called		Damped oscillations
313)	The mechanism by energy is transferred from one point to another point is		Wave motion
314)	Waves which required medium like sound and water waves are called		Mechanical waves
315)	Waves which required no medium like heat, light and radio waves are called		Electromagnetic waves
316)	Particles of waves vibrate perpendicular to the direction of the propagation of waves in		Transverse waves
317)	Particles of waves vibrate parallel to the direction of the propagation of waves in		Longitudinal waves
318)	In transverse waves the particle vibrate with the period and frequency of the		Source
319)	Mechanical waves cannot propagate through		Gases
320)	The time for one vibration is called		Time period
321)	In nature sound waves are		Compressional
322)			Speed of transverse wave
323)			Speed of longitudinal waves
324)	Speed of sound founded by Newton		281 m s^-1
325)	Speed of sound of Laplace’s correction		332 m s^-1
326)	Theoretical value of sound is 16% less than		Experimental value
327)	Propagation of sound waves through air or gas is an		Adiabatic process
328)	Increase in speed of sound for each degree rise above 0⁰ C is		0.61 m s^-1
329)	Speed of sound is directly proportional to the		Moisture and temperature
330)	Speed of sound is inversely proportional to the		Density
331)	Speed of sound is independent to the		Pressure
332)	The effect produced by the superposition of waves from two coherent sources, passing through same region is called		Interference
333)	In case of transverse waves constructive interference will occur if crest of one waves meet with another		Crest of another wave
334)	In case of longitudinal waves constructive interference will occur if compression of one waves meet with another		Compression of another wave
335)	If two waves arrive at same place at the same time but are out of phase(180⁰)		Destructive interference occur
336)	The difference between frequencies of two waves is called		Beat frequency(N)
337)	N =f =		1/T
338)	The phenomenon of beats is used in finding unknown		Frequencies
339)	Perceived fundamental frequency of sound is		Pitch
340)	In reflection of mechanical waves the angle between incident and reflected pulse is		λ/2 or π or 180⁰
341)	When transverse wave on string is reflected from a denser medium, there is a		phase change of 180⁰
342)	When transverse wave on string is reflected from a rare medium, it suffers		No phase change
343)	The reflection of original sound from a certain object is received at 0.1 sec later than the direct sound is called		Echo
344)	The effective distance for echo is		17m
345)	Stationary waves is also called		Standing waves
346)	The distance between two successive nodes or anti-nodes is equal to the		λ/2
347)	The lowest characteristics frequency of vibration f₁ is called 1^st harmonic or		Fundamental frequency
348)	When source moves towards stationary listener, then the frequency of sound		Increases
349)	When source of sound moves away from stationary listener, then frequency		Decreases
350)	When the listener moves towards stationary source, then frequency of sound		Increases
351)	When the listener moves away from source, then the frequency of sound		Decreases
352)	When source and listener both moves towards each other, then the frequency		Increases
353)	When source and listener moves away from each other, then the frequency		Decreases
354)	Doppler effect is not confined to		Sound waves
355)	Doppler effect is applicable for		Light waves
356)	When ultrasonic waves are focused on a small space in liquid , the liquid is rapidly volatilized and large number of bubbles are formed this process is called		Cavitaions
357)	In case of reflection, diffraction, interference and polarization, light behaves		Like a waves
358)	In case of photoelectric effect and Compton shift light behaves like		Particle
359)	All points lying on a crest are in the same		Phase
360)	The arrows to indicate direction of wavefronts are called		Rays
361)	The rays are always perpendicular to the		Fronts
362)	We use method of Young’s double slit experiment , Fresnl’s byprism, Lioyld’s mirror and Newton’s rings to get		Two coherent sources
363)	Young’s double slit experiment shows that nature of light is of		wave
364)	L x λ/d		Fringe spacing
365)	Michelson interferometer is used to study interference of light and to find its		Wavelength
366)	Rainbow affect for soap bubbles and oil film on surface of water is due to		Interference of light
367)	The spreading of light into the region behind an obstacle is called		Diffraction
368)	In order to measure the wavelength of light with practical instrument we use		Grating spectrometer
369)	d sinθ = m λ		Grating equation
370)	Polarization of light shows that the nature of light is		Transverse waves
371)	The net exchange of heat between two bodies of same temperature is		Zero
372)	Temperature determines the direction of		Heat flow
373)	The temperature of body can be increased by		Work and heat
374)	1 cal =		4.18 J
375)	First law of thermodynamics(ΔQ =ΔU +ΔW) is particular form of		Law of conservation of energy
376)	A device which convert heat energy into mechanical energy		Heat engine
377)	Heat cannot be converted into useful work during a		Complete cycle
378)	2^nd law of thermodynamics :Efficiency of heat engine is always less than 100%		Lord Kelvin Statement
379)	2^nd law of thermodynamics :It is impossible to cause heat to flow heat from a cold body to hot body without		Expenditure of energy