50278 + Interview Questions in Physics

1.	The electric field intensity at point near and outside the surface of a charged conductor of any shate is `E_(1)` the elecric field intensity due to uniformly charged conductor of any shape is `E_(1)` the electric field intensity due ot uniformly charged infinite thin plane sheet is `E_(2)` the relation between `E_(1)` and `E_(2)` is
Answer» The electric field intensity at point near and outside the surface of a charged conductor of any shate is `E_(1)` the elecric field intensity due to uniformly charged conductor of any shape is `E_(1)` the electric field intensity due ot uniformly charged infinite thin plane sheet is `E_(2)` the relation between `E_(1)` and `E_(2)` is

Discussion

2.	A uniform solid cylinder rolling with angular velocity ω along a plane surface strikes a vertical rigid wall. With what angular velocity the cylinder begins to roll up the wall because of impulsive blow?1) ω/22) ω/33) ω/44) ω/5
Answer» A uniform solid cylinder rolling with angular velocity ω along a plane surface strikes a vertical rigid wall. With what angular velocity the cylinder begins to roll up the wall because of impulsive blow? 1) ω/2 2) ω/3 3) ω/4 4) ω/5

Discussion

3.	In the given arrangement, strings and pulleys are light and all surface are frictionless and take g=10 m/s2. Assuming at t=0, system is released from rest, find the speed of block A (in decameter/sec) at t=2 sec.
Answer» In the given arrangement, strings and pulleys are light and all surface are frictionless and take $g = 10 {m/s}^{2}$ . Assuming at $t = 0$ , system is released from rest, find the speed of block $A$ (in decameter/sec) at $t = 2 sec$ .

Discussion

4.	In the above problem, given that M2=2M1 and M2 moves vertically downwards with acceleration a. If the position of the masses are reversed the acceleration of M2 down the inclined plane will be
Answer» In the above problem, given that $M_{2} = 2 M_{1} a n d M_{2}$ moves vertically downwards with acceleration a. If the position of the masses are reversed the acceleration of $M_{2}$ down the inclined plane will be

Discussion

5.	why do I V characteristics of a conducto deviate from straight line at high current
Answer» why do I V characteristics of a conducto deviate from straight line at high current

Discussion

6.	Two convex lenses of focal length 20 cm each are placed coaxially with a separation of 60 cm between them. The distance of image formed of a distant object by the combination from rear lens is.
Answer» Two convex lenses of focal length 20 cm each are placed coaxially with a separation of 60 cm between them. The distance of image formed of a distant object by the combination from rear lens is.

Discussion

7.	A wave pulse passing on a string with a speed of 40 cm s−1 in the negative x-direction has its maximum at x = 0 at t = 0. Where will this maximum be located at t = 5 s ?
Answer» A wave pulse passing on a string with a speed of $40 c m s^{- 1}$ in the negative x-direction has its maximum at x = 0 at t = 0. Where will this maximum be located at t = 5 s ?

Discussion

8.	An open-ended U-tube of uniform cross-sectional area contains water (density 103 kg.m−3). Initially, the water level stands at 0.29 m from the bottom in each arm. Kerosene oil (a water-immiscible liquid) of density 800 kg.m−3 is added to the left arm until its length is 0.1 m , as shown in the schematic figure below. The ratio(h1h2) of the heights of the liquid in the two arms is
Answer» An open-ended U-tube of uniform cross-sectional area contains water (density $10$ $^{3}$ ${kg.m}^{- 3}$ ). Initially, the water level stands at $0.29 m$ from the bottom in each arm. Kerosene oil (a water-immiscible liquid) of density $800 {kg.m}^{- 3}$ is added to the left arm until its length is $0.1 m$ , as shown in the schematic figure below. The ratio $(\frac{h_{1}}{h_{2}})$ of the heights of the liquid in the two arms is

Discussion

9.	The typical ionisation energy of a donor in silicon is
Answer» The typical ionisation energy of a donor in silicon is

Discussion

10.	An exhaustive set of values for x for which g(f(x)) is invertible where f(x)=cosx and g(x)=2x2−1 is
Answer» An exhaustive set of values for $x$ for which $g (f (x))$ is invertible where $f (x) = cos x$ and $g (x) = 2 x^{2} - 1$ is

Discussion

11.	A sound wave of frequency 330 hertz is incident normally at reflected wall then minimum distance from wall at which particle vibrate very much? (velocity sound is 330 metre per second)
Answer» A sound wave of frequency 330 hertz is incident normally at reflected wall then minimum distance from wall at which particle vibrate very much? (velocity sound is 330 metre per second)

Discussion

12.	A sphere of mass M and radius R2 has a concentric cavity of radius R1 as shown in figure. The force F exerted by the sphere on a particle of mass m located at a distance r from the centre of sphere varies as (0≤r≤∞)
Answer» A sphere of mass M and radius R₂ has a concentric cavity of radius R₁ as shown in figure. The force F exerted by the sphere on a particle of mass m located at a distance r from the centre of sphere varies as $(0 \leq r \leq \infty)$

Discussion

13.	If a mass is placed on surface of earth is it attract the earth?If yes then why we doesn consider a negative sign on force which is acting between mass and particle?
Answer» If a mass is placed on surface of earth is it attract the earth?If yes then why we doesn consider a negative sign on force which is acting between mass and particle?

Discussion

14.	For the system shown in the figure, assume that the cylinder remains in contact with the two wedges moving with constant velocity as indicated. What will be the velocity of cylinder?
Answer» For the system shown in the figure, assume that the cylinder remains in contact with the two wedges moving with constant velocity as indicated. What will be the velocity of cylinder?

Discussion

15.	12.A round body is rolling purely towards a vertical smooth wall it collides with wall elastically and returns back with final velocity v/3, where v is velocity before collision. If ground is sufficiently rough and moment of inertia of body is MR²/n. Find the value of n
Answer» 12.A round body is rolling purely towards a vertical smooth wall it collides with wall elastically and returns back with final velocity v/3, where v is velocity before collision. If ground is sufficiently rough and moment of inertia of body is MR²/n. Find the value of n

Discussion

16.	A bullet leaving the muzzle of a rifle barrel with a velocity v penetrated a plank and loses one-fifth of its velocity. It then strikes second plank, which it just penetrates through. Supposing the average resistance to the penetration is same in both the cases, the ratio of the thickness of the planks will be:
Answer» A bullet leaving the muzzle of a rifle barrel with a velocity $v$ penetrated a plank and loses one-fifth of its velocity. It then strikes second plank, which it just penetrates through. Supposing the average resistance to the penetration is same in both the cases, the ratio of the thickness of the planks will be:

Discussion

17.	The Laplace transform and the ROC for the signal x(t)=eatu(t−k)is
Answer» The Laplace transform and the ROC for the signal $x (t) = e^{a t} u (t - k)$ is

Discussion

18.	A convex mirror has a focal length f. A real object, placed at a distance f in front of it from the pole, produces an image at
Answer» A convex mirror has a focal length $f$ . A real object, placed at a distance $f$ in front of it from the pole, produces an image at

Discussion

19.	A parallel beam fo white is incident normally on a water film 1.0×10−4 cm thick. Find the wavelength in the visible range (400 nm - 700 nm) Which are strongly transmitted by the film. Refractive index of water = 1.33.
Answer» A parallel beam fo white is incident normally on a water film $1.0 \times 10^{- 4}$ cm thick. Find the wavelength in the visible range (400 nm - 700 nm) Which are strongly transmitted by the film. Refractive index of water = 1.33.

19.

A parallel beam fo white is incident normally on a water film 1.0×10−4 cm thick. Find the wavelength in the visible range (400 nm - 700 nm) Which are strongly transmitted by the film. Refractive index of water = 1.33.

Answer»

A parallel beam fo white is incident normally on a water film $1.0 \times 10^{- 4}$ cm thick. Find the wavelength in the visible range (400 nm - 700 nm) Which are strongly transmitted by the film. Refractive index of water = 1.33.

Discussion

20.	What should be the angle between two plane mirrors so that whatever be the angle of incidence, the incident ray and the reflected ray from the two mirrors be parallel to each other
Answer» What should be the angle between two plane mirrors so that whatever be the angle of incidence, the incident ray and the reflected ray from the two mirrors be parallel to each other

Discussion

21.	For a series LCR circuit at resonance, the statement which is not true is:
Answer» For a series LCR circuit at resonance, the statement which is not true is:

Discussion

22.	A particle moves according to the equation x=2t2−5t+6 where, x is in m. Find (i) average velocity in the first 3 s, and (ii) instantaneous velocity at t=3 s.
Answer» A particle moves according to the equation $x = 2 t^{2} - 5 t + 6$ where, $x$ is in $m$ . Find $(i)$ average velocity in the first $3 s$ , and $(i i)$ instantaneous velocity at $t = 3 s$ .

Discussion

23.	A Zener diode is connected to a battery and a load as shown below. The currents I, Iz and IL are respectively
Answer» A Zener diode is connected to a battery and a load as shown below. The currents $I, I_{z}$ and $I_{L}$ are respectively

Discussion

24.	A rnachine gun of l5 kg fires 0.02 kg bullets at the rate of l0 per second with a speed of 300 m/s. Calculate the force required to hold the gun in position.
Answer» A rnachine gun of l5 kg fires 0.02 kg bullets at the rate of l0 per second with a speed of 300 m/s. Calculate the force required to hold the gun in position.

Discussion

25.	Q. Two springs have force constant K1 and K2 ( K1> K2). Each spring is extended by same force F. Ifthe elastic potential energy are E1 and E2 then E1/E2 is K1/K2 K2/K1 ✓(K1/K2) ✓(K2/K1)
Answer» Q. Two springs have force constant K1 and K2 ( K1> K2). Each spring is extended by same force F. Ifthe elastic potential energy are E1 and E2 then E1/E2 is K1/K2 K2/K1 ✓(K1/K2) ✓(K2/K1)

Discussion

26.	A metallic rod of length l and cross–sectional area A is made of a material of Young’s modulus Y. if the rod is elongated by an amount y, then the work done is proportional to
Answer» A metallic rod of length $l$ and cross–sectional area A is made of a material of Young’s modulus $Y$ . if the rod is elongated by an amount $y$ , then the work done is proportional to

Discussion

27.	What is factor theoram
Answer» What is factor theoram

Discussion

28.	When we are finding out power dissipated, when to consider potential and when to consider current? i.e. when to use P=V²/R and P=I²R
Answer» When we are finding out power dissipated, when to consider potential and when to consider current? i.e. when to use P=V²/R and P=I²R

Discussion

29.	A dielectic of dielectric constant K completely fills the gap between the plates of a parallel plate capacitor whose capacitance is equal to C0 , when dielectric is absent. Find the mechanical work that must be done against electric forces for extracting the dielectric out of the capacitor , if voltage (V) of the capacitor is maintained constant.
Answer» A dielectic of dielectric constant $K$ completely fills the gap between the plates of a parallel plate capacitor whose capacitance is equal to $C_{0}$ , when dielectric is absent. Find the mechanical work that must be done against electric forces for extracting the dielectric out of the capacitor , if voltage $(V)$ of the capacitor is maintained constant.

Discussion

30.	A toy car accelerates from rest at 2m/s2 for 3 seconds. Afterwards, the car begins to slow down. It travels a total of 27 m before coming to rest. Find its acceleration while stopping and the total time of the motion.
Answer» A toy car accelerates from rest at $2 m / s^{2}$ for 3 seconds. Afterwards, the car begins to slow down. It travels a total of 27 m before coming to rest. Find its acceleration while stopping and the total time of the motion.

Discussion

31.	The figure shows two parallel plane mirrors. Object ′O′ is placed 7 cm from mirror M1. Then, the distance of the final image from the mirror M1 is
Answer» The figure shows two parallel plane mirrors. Object $^{'} O^{'}$ is placed $7 cm$ from mirror $M_{1}$ . Then, the distance of the final image from the mirror $M_{1}$ is

Discussion

32.	In Exercises 7.3 and 7.4, what is the net power absorbed by each circuit over a complete cycle. Explain your answer.
Answer» In Exercises 7.3 and 7.4, what is the net power absorbed by each circuit over a complete cycle. Explain your answer.

Discussion

33.	Two sound sources each emitting waves of wavelength lymbda are fixed a given distance apart and an observer moves from one source to another with velocity u. Then number of beats heard by him per second is
Answer» Two sound sources each emitting waves of wavelength lymbda are fixed a given distance apart and an observer moves from one source to another with velocity u. Then number of beats heard by him per second is

Discussion

34.	A car travelling with a speed of 80 km/h slowed down to 44 km/h in 15s. The retardation i
Answer» A car travelling with a speed of 80 km/h slowed down to 44 km/h in 15s. The retardation i

Discussion

35.	AB19. A point charge q is held at the centre of a circle ofradius r. B, C are two points on the circumference ofthe circle and A is a point outside the circle. If Wrepresents work done by electric field in taking acharge 9, from A to B and Wac represents theworkdone from A to C, thenBАС(1) WAR > WAO(3) We = W(2) WAB < WAGWas = W#0AB(4) WACAc=0
Answer» AB 19. A point charge q is held at the centre of a circle of radius r. B, C are two points on the circumference of the circle and A is a point outside the circle. If W represents work done by electric field in taking a charge 9, from A to B and Wac represents the workdone from A to C, then B А С (1) WAR > WAO (3) We = W (2) WAB < WAG Was = W #0 AB (4) W AC Ac=0

Discussion

36.	Statement I : A plane mirror can never form a real image. Statement II : The reflected rays from a mirror need to actually intersect to form a real image.
Answer» Statement I : A plane mirror can never form a real image. Statement II : The reflected rays from a mirror need to actually intersect to form a real image.

36.

Statement I : A plane mirror can never form a real image. Statement II : The reflected rays from a mirror need to actually intersect to form a real image.

Answer»

Statement I : A plane mirror can never form a real image.

Statement II : The reflected rays from a mirror need to actually intersect to form a real image.

Discussion

37.	A block of mass m moves on a horizontal circular path against the wall of a cylindrical room of radius R. The floor of the room on which the block moves is smooth, but the friction coefficient between the wall and the block is μ. Take μs=μk=μ. The block is given an initial speed v∘. Obtain the speed of the block 'v' after one revolution.
Answer» A block of mass $m$ moves on a horizontal circular path against the wall of a cylindrical room of radius $R$ . The floor of the room on which the block moves is smooth, but the friction coefficient between the wall and the block is $μ$ . Take $μ_{s} = μ_{k} = μ$ . The block is given an initial speed $v_{\circ}$ . Obtain the speed of the block ' $v$ ' after one revolution.

Discussion

38.	An ideal monatomic gas is supplied 80 joule heat atconstant pressure. The increase in internal energyof gas, is
Answer» An ideal monatomic gas is supplied 80 joule heat atconstant pressure. The increase in internal energyof gas, is

Discussion

39.	Let a →a=^1+4^J+2^k,→b=3^i−2^j+7^kandc=2^i−^j+4^k. find a vector →d which is perpendicular to both →a and →b and →c.→d=27.
Answer» Let a $\to a =^1 + 4^J + 2^k, \to b = 3^i - 2^j + 7^k a n d c = 2^i -^j + 4^k .$ find a vector $\to d$ which is perpendicular to both $\to a$ and $\to b$ and $\to c . \to d = 27.$

Discussion

40.	8.A condensor of capacity C is charged to a potential difference of V1 .The plates of the condensor are then connected to an ideal inductor L. The current through the inductor when the potential difference across the condenser reduces to V2 is
Answer» 8.A condensor of capacity C is charged to a potential difference of V1 .The plates of the condensor are then connected to an ideal inductor L. The current through the inductor when the potential difference across the condenser reduces to V2 is

Discussion

41.	100. A bomb of mass 20 kg is moving with a velocity of10 ms-1 on a straight path and suddenly explodesinto two fragments. One moves in the samedirection with velocity of 40 ms-tand other inopposite direction with velocity of 20 ms-1. Find themagnitude of the masses
Answer» 100. A bomb of mass 20 kg is moving with a velocity of10 ms-1 on a straight path and suddenly explodesinto two fragments. One moves in the samedirection with velocity of 40 ms-tand other inopposite direction with velocity of 20 ms-1. Find themagnitude of the masses

Discussion

42.	In translational equilibrium, which of the following is true about the velocities of all points on the body?
Answer» In translational equilibrium, which of the following is true about the velocities of all points on the body?

Discussion

43.	A block m1 of mass 2.0 kg is moving on a frictionless horizontal surface with a velocity of 1.0 m/s towards another block m2 of equal mass kept at rest as shown. The spring constant of the spring fixed at one end of m2 is 100 N/m. The maximum compression of the spring is
Answer» A block $m_{1}$ of mass $2.0 kg$ is moving on a frictionless horizontal surface with a velocity of $1.0 m/s$ towards another block $m_{2}$ of equal mass kept at rest as shown. The spring constant of the spring fixed at one end of $m_{2}$ is $100 N/m$ . The maximum compression of the spring is

Discussion

44.	If a ball is thrown upwards from the surface of the earth then initially a)The earth remains stationary while the ball moves upwards b)The ball remains stationary while the earth moves downwards c)The ball and earth both move toward each other d)The ball and earth both move away from each other Also explain why and how
Answer» If a ball is thrown upwards from the surface of the earth then initially a)The earth remains stationary while the ball moves upwards b)The ball remains stationary while the earth moves downwards c)The ball and earth both move toward each other d)The ball and earth both move away from each other Also explain why and how

44.

If a ball is thrown upwards from the surface of the earth then initially a)The earth remains stationary while the ball moves upwards b)The ball remains stationary while the earth moves downwards c)The ball and earth both move toward each other d)The ball and earth both move away from each other Also explain why and how

Answer»

If a ball is thrown upwards from the surface of the earth then initially

a)The earth remains stationary while the ball moves upwards

b)The ball remains stationary while the earth moves downwards

c)The ball and earth both move toward each other

d)The ball and earth both move away from each other

Also explain why and how

Discussion

45.	The current i in the circuit is [IIT-JEE 1983]
Answer» The current i in the circuit is [IIT-JEE 1983]

Discussion

46.	A short magnetic dipole is placed at origin with its dipole moment directed along +x axos . If the magnetic field induction at point P (r,0) is Bi^cap , the magntic field induction at point Q (0,2r) will be?
Answer» A short magnetic dipole is placed at origin with its dipole moment directed along +x axos . If the magnetic field induction at point P (r,0) is Bi^cap , the magntic field induction at point Q (0,2r) will be?

Discussion

47.	A ray of light is incident at angle of 60^° on oneface of a prism which has an apex angle of 30^° .emerging out of the prism makesThe rayan angle of 30^° with the incident ray. The refractiveindex of the material of the prism is-
Answer» A ray of light is incident at angle of 60^° on oneface of a prism which has an apex angle of 30^° .emerging out of the prism makesThe rayan angle of 30^° with the incident ray. The refractiveindex of the material of the prism is-

Discussion

48.	A block of mass m1=2kg slides along a frictionless table with a speed of 10m/s. Directly in front of it, and moving in same direction is a block of mass m2=5kg moving at a speed of 3 m/s. A massless spring with a constant of k = 1120 N/m is attached to the back side of m2 as shown. When the block collides, what is the maximum compression in the spring?
Answer» A block of mass $m_{1} = 2 k g$ slides along a frictionless table with a speed of 10m/s. Directly in front of it, and moving in same direction is a block of mass $m_{2} = 5 k g$ moving at a speed of 3 m/s. A massless spring with a constant of k = 1120 N/m is attached to the back side of $m_{2}$ as shown. When the block collides, what is the maximum compression in the spring?

48.

A block of mass m1=2kg slides along a frictionless table with a speed of 10m/s. Directly in front of it, and moving in same direction is a block of mass m2=5kg moving at a speed of 3 m/s. A massless spring with a constant of k = 1120 N/m is attached to the back side of m2 as shown. When the block collides, what is the maximum compression in the spring?

Answer»

A block of mass $m_{1} = 2 k g$ slides along a frictionless table with a speed of 10m/s. Directly in front of it, and moving in same direction is a block of mass $m_{2} = 5 k g$ moving at a speed of 3 m/s. A massless spring with a constant of k = 1120 N/m is attached to the back side of $m_{2}$ as shown. When the block collides, what is the maximum compression in the spring?

Discussion

49.	For objects with uniform mass density, the center of mass coincides with the geometrical center. This statement is
Answer» For objects with uniform mass density, the center of mass coincides with the geometrical center. This statement is

Discussion

50.	A relief aeroplane is flying at a constant height of 1960 m with 600 km/hr speed above the ground towards a point directly over a person struggling in flood water. At what angle of sight with the vertical should the pilot release a survival kit if it has to reach the person in water ?(g=9.8 m/s2)
Answer» A relief aeroplane is flying at a constant height of $1960 m$ with $600 km/hr$ speed above the ground towards a point directly over a person struggling in flood water. At what angle of sight with the vertical should the pilot release a survival kit if it has to reach the person in water ? $(g = 9.8 {m/s}^{2})$

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A uniform solid cylinder rolling with angular velocity ω along a plane surface strikes a vertical rigid wall. With what angular velocity the cylinder begins to roll up the wall because of impulsive blow?1) ω/22) ω/33) ω/44) ω/5

In the given arrangement, strings and pulleys are light and all surface are frictionless and take g=10 m/s2. Assuming at t=0, system is released from rest, find the speed of block A (in decameter/sec) at t=2 sec.

In the above problem, given that M2=2M1 and M2 moves vertically downwards with acceleration a. If the position of the masses are reversed the acceleration of M2 down the inclined plane will be

why do I V characteristics of a conducto deviate from straight line at high current

Two convex lenses of focal length 20 cm each are placed coaxially with a separation of 60 cm between them. The distance of image formed of a distant object by the combination from rear lens is.

A wave pulse passing on a string with a speed of 40 cm s−1 in the negative x-direction has its maximum at x = 0 at t = 0. Where will this maximum be located at t = 5 s ?

The typical ionisation energy of a donor in silicon is

An exhaustive set of values for x for which g(f(x)) is invertible where f(x)=cosx and g(x)=2x2−1 is

A sound wave of frequency 330 hertz is incident normally at reflected wall then minimum distance from wall at which particle vibrate very much? (velocity sound is 330 metre per second)

A sphere of mass M and radius R2 has a concentric cavity of radius R1 as shown in figure. The force F exerted by the sphere on a particle of mass m located at a distance r from the centre of sphere varies as (0≤r≤∞)

If a mass is placed on surface of earth is it attract the earth?If yes then why we doesn consider a negative sign on force which is acting between mass and particle?

For the system shown in the figure, assume that the cylinder remains in contact with the two wedges moving with constant velocity as indicated. What will be the velocity of cylinder?

12.A round body is rolling purely towards a vertical smooth wall it collides with wall elastically and returns back with final velocity v/3, where v is velocity before collision. If ground is sufficiently rough and moment of inertia of body is MR²/n. Find the value of n

The Laplace transform and the ROC for the signal x(t)=eatu(t−k)is

A convex mirror has a focal length f. A real object, placed at a distance f in front of it from the pole, produces an image at

A parallel beam fo white is incident normally on a water film 1.0×10−4 cm thick. Find the wavelength in the visible range (400 nm - 700 nm) Which are strongly transmitted by the film. Refractive index of water = 1.33.

What should be the angle between two plane mirrors so that whatever be the angle of incidence, the incident ray and the reflected ray from the two mirrors be parallel to each other

For a series LCR circuit at resonance, the statement which is not true is:

A particle moves according to the equation x=2t2−5t+6 where, x is in m. Find (i) average velocity in the first 3 s, and (ii) instantaneous velocity at t=3 s.

A Zener diode is connected to a battery and a load as shown below. The currents I, Iz and IL are respectively

A rnachine gun of l5 kg fires 0.02 kg bullets at the rate of l0 per second with a speed of 300 m/s. Calculate the force required to hold the gun in position.

Q. Two springs have force constant K1 and K2 ( K1> K2). Each spring is extended by same force F. Ifthe elastic potential energy are E1 and E2 then E1/E2 is K1/K2 K2/K1 ✓(K1/K2) ✓(K2/K1) ​​​​​​

A metallic rod of length l and cross–sectional area A is made of a material of Young’s modulus Y. if the rod is elongated by an amount y, then the work done is proportional to

What is factor theoram

When we are finding out power dissipated, when to consider potential and when to consider current? i.e. when to use P=V²/R and P=I²R

A toy car accelerates from rest at 2m/s2 for 3 seconds. Afterwards, the car begins to slow down. It travels a total of 27 m before coming to rest. Find its acceleration while stopping and the total time of the motion.

The figure shows two parallel plane mirrors. Object ′O′ is placed 7 cm from mirror M1. Then, the distance of the final image from the mirror M1 is

In Exercises 7.3 and 7.4, what is the net power absorbed by each circuit over a complete cycle. Explain your answer.

Two sound sources each emitting waves of wavelength lymbda are fixed a given distance apart and an observer moves from one source to another with velocity u. Then number of beats heard by him per second is

A car travelling with a speed of 80 km/h slowed down to 44 km/h in 15s. The retardation i

Statement I : A plane mirror can never form a real image. Statement II : The reflected rays from a mirror need to actually intersect to form a real image.

An ideal monatomic gas is supplied 80 joule heat atconstant pressure. The increase in internal energyof gas, is

Let a →a=^1+4^J+2^k,→b=3^i−2^j+7^kandc=2^i−^j+4^k. find a vector →d which is perpendicular to both →a and →b and →c.→d=27.

8.A condensor of capacity C is charged to a potential difference of V1 .The plates of the condensor are then connected to an ideal inductor L. The current through the inductor when the potential difference across the condenser reduces to V2 is

100. A bomb of mass 20 kg is moving with a velocity of10 ms-1 on a straight path and suddenly explodesinto two fragments. One moves in the samedirection with velocity of 40 ms-tand other inopposite direction with velocity of 20 ms-1. Find themagnitude of the masses

In translational equilibrium, which of the following is true about the velocities of all points on the body?

A block m1 of mass 2.0 kg is moving on a frictionless horizontal surface with a velocity of 1.0 m/s towards another block m2 of equal mass kept at rest as shown. The spring constant of the spring fixed at one end of m2 is 100 N/m. The maximum compression of the spring is

The current i in the circuit is [IIT-JEE 1983]

A short magnetic dipole is placed at origin with its dipole moment directed along +x axos . If the magnetic field induction at point P (r,0) is Bi^cap , the magntic field induction at point Q (0,2r) will be?

A ray of light is incident at angle of 60^° on oneface of a prism which has an apex angle of 30^° .emerging out of the prism makesThe rayan angle of 30^° with the incident ray. The refractiveindex of the material of the prism is-

For objects with uniform mass density, the center of mass coincides with the geometrical center. This statement is

A relief aeroplane is flying at a constant height of 1960 m with 600 km/hr speed above the ground towards a point directly over a person struggling in flood water. At what angle of sight with the vertical should the pilot release a survival kit if it has to reach the person in water ?(g=9.8 m/s2)

Q. Two springs have force constant K1 and K2 ( K1> K2). Each spring is extended by same force F. Ifthe elastic potential energy are E1 and E2 then E1/E2 is K1/K2 K2/K1 ✓(K1/K2) ✓(K2/K1)