50278 + Interview Questions in Physics

1.	A capacitor is charged to a certain potential difference and stores some energy. In order to double the energy stored in the capacitor, the potential difference must be increased nearly by
Answer» A capacitor is charged to a certain potential difference and stores some energy. In order to double the energy stored in the capacitor, the potential difference must be increased nearly by

Discussion

2.	A barometer tube is 80 cm long (above the mercury reservoir). It reads 76 cm on a particular day. A small amount of water is introduced in the tube and the reading drops to 75.4 cm. Find the relative humidity in the space above the mercury column if the saturation vapour pressure at the room temperature is 1.0 cm.
Answer» A barometer tube is 80 cm long (above the mercury reservoir). It reads 76 cm on a particular day. A small amount of water is introduced in the tube and the reading drops to 75.4 cm. Find the relative humidity in the space above the mercury column if the saturation vapour pressure at the room temperature is 1.0 cm.

Discussion

3.	Two resistance R1 and R2 are made of different materials. The temperature coefficient of the material of R1 is α and that of the material of R2 is −β. The resistance of the series combination of R1 and R2 does not change with temperature, then the ratio of resistances of the two wires at 0∘C will be:
Answer» Two resistance $R_{1}$ and $R_{2}$ are made of different materials. The temperature coefficient of the material of $R_{1}$ is $α$ and that of the material of $R_{2}$ is $- β$ . The resistance of the series combination of $R_{1}$ and $R_{2}$ does not change with temperature, then the ratio of resistances of the two wires at $0^{\circ} C$ will be:

Discussion

4.	What are laws of motion?
Answer» What are laws of motion?

Discussion

5.	An electromagnetic flow meter is used to measure the blood flow in a vessel. The diameter of vessel is 10 mm and the flux density across the electrode is π mm. If the output voltage for a particular flow rate is 1mV then the flow rate in mm3/s is ? 2.5
Answer» An electromagnetic flow meter is used to measure the blood flow in a vessel. The diameter of vessel is 10 mm and the flux density across the electrode is $π m m$ . If the output voltage for a particular flow rate is 1mV then the flow rate in $m m^{3} / s$ is ? 2.5

Discussion

6.	at what depth from the earth's surface the value of acceleration due to gravity reduces by 1% of its value on the earth surface?
Answer» at what depth from the earth's surface the value of acceleration due to gravity reduces by 1% of its value on the earth surface?

Discussion

7.	A small sphere of mass ‘m’ is tied to the top of the smooth inclined plane with the help of a string of length ‘L’. The string and the inclined plane makes an angle ‘θ’ with the horizontal. The inclined plane is rotated with a constant angular velocity ‘ω’ about the vertical axis passing through the end of the string fixed to the plane as shown in the figure. If θ=37∘,ω=2rad/s,L=2.45m, then the ratio between the tension in the string and the normal reaction between the sphere and the plane is: [consider sin 37∘=35 andg=9.8m/s2]
Answer» A small sphere of mass ‘m’ is tied to the top of the smooth inclined plane with the help of a string of length ‘L’. The string and the inclined plane makes an angle ‘ $θ$ ’ with the horizontal. The inclined plane is rotated with a constant angular velocity ‘ $ω$ ’ about the vertical axis passing through the end of the string fixed to the plane as shown in the figure. If $θ = 37^{\circ}, ω = 2 r a d / s, L = 2.45 m,$ then the ratio between the tension in the string and the normal reaction between the sphere and the plane is: [consider sin $37^{\circ} = \frac{3}{5} a n d g = 9.8 m / s^{2}]$

Discussion

8.	A cable PQ of length 25 m is supported at two ends at same level as shown in the figure. The horizontal distance between the supports is 20 m. A point load of 150 kN is applied at point R, which divides it into two equal parts.Neglecting the self-weight of the cable, the tension (in kN, in integer value) in the cable due to applied load will be____125
Answer» A cable PQ of length 25 m is supported at two ends at same level as shown in the figure. The horizontal distance between the supports is 20 m. A point load of 150 kN is applied at point R, which divides it into two equal parts. Neglecting the self-weight of the cable, the tension (in kN, in integer value) in the cable due to applied load will be____ 125

Discussion

9.	The maximum intensity in Young's double-slit experiment is I0. Distance between the slits is d=5λ, where λ is the wavelength of monochromatic light used in the experiment. What will be the intensity of light in front of one of the slits on a screen at a distance D=10d ?
Answer» The maximum intensity in Young's double-slit experiment is $I_{0}$ . Distance between the slits is $d = 5 λ$ , where $λ$ is the wavelength of monochromatic light used in the experiment. What will be the intensity of light in front of one of the slits on a screen at a distance $D = 10 d$ ?

Discussion

10.	56.What is the moment of inertia of a plane sheet??like rectangular or a plane square sheet
Answer» 56.What is the moment of inertia of a plane sheet??like rectangular or a plane square sheet

Discussion

11.	17. Pressure exerted by 1 mole of an ideal gas kept in vessel of V l having root mean square speed of molecules v and mass m of each molecule is correctly given by equation
Answer» 17. Pressure exerted by 1 mole of an ideal gas kept in vessel of V l having root mean square speed of molecules v and mass m of each molecule is correctly given by equation

Discussion

12.	A bullet of mass 10 g moving with a speed of 20 m/s hits an ice block of mass 990 g kept on a floor and gets stuck in it. How much ice will melt if 50% of the lost KE goes to ice? (initial temperature of the ice block and bullet = 0∘C)
Answer» A bullet of mass $10 g$ moving with a speed of $20 m/s$ hits an ice block of mass $990 g$ kept on a floor and gets stuck in it. How much ice will melt if $50 %$ of the lost KE goes to ice? (initial temperature of the ice block and bullet = $0^{\circ} C$ )

Discussion

13.	if the frequency of an object in uniform circular motion is doubled,its acceleration becomes
Answer» if the frequency of an object in uniform circular motion is doubled,its acceleration becomes

Discussion

14.	Electromagnetic radiation of frequency n, wavelength λ, travelling with velocity v in air, enters a glass slab of refractive index μ. The frequency, wavelength and velocity of light in the glass slab will be respectively.
Answer» Electromagnetic radiation of frequency $n$ , wavelength $λ$ , travelling with velocity $v$ in air, enters a glass slab of refractive index $μ$ . The frequency, wavelength and velocity of light in the glass slab will be respectively.

Discussion

15.	The maximum range of a gun on a horizontal terrain is 16 km. If g=10 m/s2, then muzzle velocity of the shell must be
Answer» The maximum range of a gun on a horizontal terrain is $16 km$ . If $g = 10 {m/s}^{2}$ , then muzzle velocity of the shell must be

Discussion

16.	A particle free to move along the x-axis has potential energy given by U(x)=k[1−exp(−x)2] for −∞≤x≤+∞, where k is a positive constant of appropriate dimensions. Then
Answer» A particle free to move along the x-axis has potential energy given by $U (x) = k [1 - e x p (- x)^{2}]$ for $- \infty \leq x \leq + \infty$ , where k is a positive constant of appropriate dimensions. Then

16.

A particle free to move along the x-axis has potential energy given by U(x)=k[1−exp(−x)2] for −∞≤x≤+∞, where k is a positive constant of appropriate dimensions. Then

Answer»

A particle free to move along the x-axis has potential energy given by $U (x) = k [1 - e x p (- x)^{2}]$ for $- \infty \leq x \leq + \infty$ , where k is a positive constant of appropriate dimensions. Then

Discussion

17.	Q Provided a racing car does not lose traction,the time taken by it to race from rest through adistance depends mainly on engine's power P. Ddrivethe time t in terms of S and P, assuming that power isconstant
Answer» Q Provided a racing car does not lose traction,the time taken by it to race from rest through adistance depends mainly on engine's power P. Ddrivethe time t in terms of S and P, assuming that power isconstant

Discussion

18.	A planet has mass 110th of that of earth, while radius is 13rd that of earth. If a person can throw a stone on earth surface to a height of 90 m, then he will be able to throw the stone on that planet to a height (in meter)-
Answer» A planet has mass ${\frac{1}{10}}^{t h}$ of that of earth, while radius is ${\frac{1}{3}}^{r d}$ that of earth. If a person can throw a stone on earth surface to a height of 90 m, then he will be able to throw the stone on that planet to a height (in meter)-

Discussion

19.	A particle falls from a height 'h upon a fixed horizontal plane and rebounds. If 'e' is the coefficient of restitution, then the total distance travelled before rebounding has stopped is
Answer» A particle falls from a height 'h upon a fixed horizontal plane and rebounds. If 'e' is the coefficient of restitution, then the total distance travelled before rebounding has stopped is

Discussion

20.	A glass tube, sealed at both ends, is 100 cm long. It lies horizontally with the middle 10 cm containing mercury. The two ends of the tube contain air at 270C and at a pressure 76 cm of mercury. The air column on one side is maintained at 00C and the other side is maintained at 1270C. Calculate the length of the air column on the cooler side. Neglect the changes in the volume of mercury and of the glass.
Answer» A glass tube, sealed at both ends, is 100 cm long. It lies horizontally with the middle 10 cm containing mercury. The two ends of the tube contain air at $27^{0}$ C and at a pressure 76 cm of mercury. The air column on one side is maintained at $0^{0}$ C and the other side is maintained at $127^{0}$ C. Calculate the length of the air column on the cooler side. Neglect the changes in the volume of mercury and of the glass.

Discussion

21.	A particle is projected from point ′A′ , that is at a distance 4R from the centre of the Earth, with speed V0 as shown. If the particle passes grazing the earth's surface, then it is found that V0=4000×√N. Find the value of N.[Take GMR=6.4×107m2s2]
Answer» A particle is projected from point $^{'} A^{'}$ , that is at a distance $4 R$ from the centre of the Earth, with speed $V_{0}$ as shown. If the particle passes grazing the earth's surface, then it is found that $V_{0} = 4000 \times \sqrt{N}$ . Find the value of N. [Take $\frac{G M}{R} = 6.4 \times 10^{7} \frac{m^{2}}{s^{2}}$ ]

Discussion

22.	An object is seen through a glass slab of thickness 36 cm and refractive index 1.5. The observer and the slab are dipped in water of refractive index μ=43. The shift produced in the position of the object is
Answer» An object is seen through a glass slab of thickness $36 cm$ and refractive index $1.5$ . The observer and the slab are dipped in water of refractive index $μ = \frac{4}{3}$ . The shift produced in the position of the object is

Discussion

23.	An object is moving with an initial velocity of 5 m/s. It starts accelerating with an acceleration of 2.5 m/s2. Calculate the displacement of the object after 10 s.
Answer» An object is moving with an initial velocity of $5 m/s$ . It starts accelerating with an acceleration of $2.5 {m/s}^{2}$ . Calculate the displacement of the object after $10 s$ .

Discussion

24.	Define power.
Answer» Define power.

Discussion

25.	If an electron has a wavelength λ and it has an uncertainty in its kinetic energy equal to ΔE, then what will be uncertainty in its position?
Answer» If an electron has a wavelength $λ$ and it has an uncertainty in its kinetic energy equal to $Δ E$ , then what will be uncertainty in its position?

Discussion

26.	In the determination of Young’s modulus (Y=4 MLgπl d2) by using Searle’s method, a wire of length L=2m and diameter d=0.5mm is used. For a load M=2.5kg, an extension l=0.25mm in the length of the wire is observed. Quantities d and l are measured using a screw gauge and a micrometer, respectively. They have the same pitch of 0.5mm. The number of divisions on their circular scale is 100. The contributions to the maximum probable error of the Y measurement is:
Answer» In the determination of Young’s modulus $(Y = \frac{4 M L g}{π l d^{2}})$ by using Searle’s method, a wire of length L=2m and diameter d=0.5mm is used. For a load M=2.5kg, an extension l=0.25mm in the length of the wire is observed. Quantities d and l are measured using a screw gauge and a micrometer, respectively. They have the same pitch of 0.5mm. The number of divisions on their circular scale is 100. The contributions to the maximum probable error of the Y measurement is:

Discussion

27.	The efficiency of the thermodynamic cycle shown in figure for an ideal diatomic gas is given by the fraction 1n. Then, find n
Answer» The efficiency of the thermodynamic cycle shown in figure for an ideal diatomic gas is given by the fraction $\frac{1}{n}$ . Then, find $n$

Discussion

28.	A piece of wire is bent in the shape of a parabola y=kx2 (y-axis vertical) with a bead of mass m on it. The bead can slide on the wire without friction. It stays at the lowestpoint of the parabola when the wire is at rest. The wire is now accelerated parallel to the x-axis with a constant acceleration a. The distance of the new equilibrium position of the bead, where the bead can stay at rest with respect to the wire, from the y-axis is
Answer» A piece of wire is bent in the shape of a parabola $y = k x^{2}$ ( $y$ -axis vertical) with a bead of mass $m$ on it. The bead can slide on the wire without friction. It stays at the lowestpoint of the parabola when the wire is at rest. The wire is now accelerated parallel to the $x$ -axis with a constant acceleration $a$ . The distance of the new equilibrium position of the bead, where the bead can stay at rest with respect to the wire, from the $y$ -axis is

Discussion

29.	A ray of light is incident at an angle of incidence i on one surface of a thin prism (with angle of prism A) and emerges normally from the other face. If the refractive index of the prism is n. then the angle of incidence is nearly equal to :
Answer» A ray of light is incident at an angle of incidence $i$ on one surface of a thin prism $($ with angle of prism $A$ $)$ and emerges normally from the other face. If the refractive index of the prism is $n$ . then the angle of incidence is nearly equal to :

Discussion

30.	Two satellites of equal mass are revolving around earth in elliptical orbits of different semi-major axis. If their angular momentum about earth's centre are in the ratio 3:4, then the ratio of their areal velocity is
Answer» Two satellites of equal mass are revolving around earth in elliptical orbits of different semi-major axis. If their angular momentum about earth's centre are in the ratio $3 : 4$ , then the ratio of their areal velocity is

Discussion

31.	Match the following1. Sound waves (i) Mechanical wave2. Light waves (ii) Non-mechanical waves3. Waves on a string (iii) Transverse waves (iv) Longitudinal waves
Answer» Match the following 1. Sound waves (i) Mechanical wave 2. Light waves (ii) Non-mechanical waves 3. Waves on a string (iii) Transverse waves (iv) Longitudinal waves

31.

Match the following1. Sound waves (i) Mechanical wave2. Light waves (ii) Non-mechanical waves3. Waves on a string (iii) Transverse waves (iv) Longitudinal waves

Answer»

Match the following

1. Sound waves (i) Mechanical wave

2. Light waves (ii) Non-mechanical waves

3. Waves on a string (iii) Transverse waves

(iv) Longitudinal waves

Discussion

32.	A bullet of mass m leaves a gun of mass M kept on a smooth horizontal surface. If speed of the bullet relative to the gun is v, then recoil speed of the gun will be:
Answer» A bullet of mass m leaves a gun of mass M kept on a smooth horizontal surface. If speed of the bullet relative to the gun is v, then recoil speed of the gun will be:

Discussion

33.	Two conducting sphere of radii r₁ and r₂ are equally charged then the ratio of their potential is
Answer» Two conducting sphere of radii r₁ and r₂ are equally charged then the ratio of their potential is

Discussion

34.	An F−x graph is shown below. Find the difference in initial and final potential energies from x=0 m to x=3 m.
Answer» An $F - x$ graph is shown below. Find the difference in initial and final potential energies from $x = 0 m$ to $x = 3 m$ .

Discussion

35.	46.Two capacitors C1 and C2 are connected in a circuit as shown in figure. The potential difference (VA - VB) is : (a)8V (b)-8V (c)12V (d) -12V
Answer» 46.Two capacitors C1 and C2 are connected in a circuit as shown in figure. The potential difference (VA - VB) is : (a)8V (b)-8V (c)12V (d) -12V

Discussion

36.	Find the centre of mass of a uniform L-shaped lamina (a thin flat plate) with dimensions as shown. The mass of the lamina is 3 kg.
Answer» Find the centre of mass of a uniform L-shaped lamina (a thin flat plate) with dimensions as shown. The mass of the lamina is 3 kg.

Discussion

37.	The displacement x of a body in motion is given by x = a sin(ωt+θ). The time at which the displacement is maximum is:
Answer» The displacement x of a body in motion is given by x = a sin(ωt+θ). The time at which the displacement is maximum is:

Discussion

38.	Consider a ring of mass m and radius r maximum gravitational intensity on the axis of the Ring has value
Answer» Consider a ring of mass m and radius r maximum gravitational intensity on the axis of the Ring has value

Discussion

39.	,Two concentric shell have masses M and m and their radius are R and r respectively.when R>r. e What is gravational potential at apoint for whic h r
Answer» ,Two concentric shell have masses M and m and their radius are R and r respectively.when R>r. e What is gravational potential at apoint for whic h r

Discussion

40.	A rocket is fired ‘vertically’ from the surface of mars with a speed of 2 km s¯¹. If 20% of its initial energy is lost due to martian atmospheric resistance, how far will the rocket go from the surface of mars before returning to it ? Mass of mars = 6.4×10²³ kg; radius of mars = 3395 km; G = 6.67×10-¯¹¹ N m² kg¯².
Answer» A rocket is fired ‘vertically’ from the surface of mars with a speed of 2 km s¯¹. If 20% of its initial energy is lost due to martian atmospheric resistance, how far will the rocket go from the surface of mars before returning to it ? Mass of mars = 6.4×10²³ kg; radius of mars = 3395 km; G = 6.67×10-¯¹¹ N m² kg¯².

Discussion

41.	Two resistance R1 and R2 are made of different materials. The temperature coefficient of the material of R1 is α and that of the material of R2 is −β. The resistance of the series combination of R1 and R2 does not change with temperature, then the ratio of resistance of the two wires at 0∘C will be:
Answer» Two resistance $R_{1}$ and $R_{2}$ are made of different materials. The temperature coefficient of the material of $R_{1}$ is $α$ and that of the material of $R_{2}$ is $- β$ . The resistance of the series combination of $R_{1}$ and $R_{2}$ does not change with temperature, then the ratio of resistance of the two wires at $0^{\circ} C$ will be:

Discussion

42.	A boy of mass 25 kg stands on a board of mass 10 kg which in turn is kept on a frictionless horizontal surface. The boy makes a jump with a velocity 5 m/s in the horizontal direction with respect to the board. With what velocity does the board recoil?
Answer» A boy of mass 25 kg stands on a board of mass 10 kg which in turn is kept on a frictionless horizontal surface. The boy makes a jump with a velocity 5 m/s in the horizontal direction with respect to the board. With what velocity does the board recoil?

Discussion

43.	can any reaction be possible if all 3 , temp.,pressure,$ vol.m are kept cons†an t
Answer» can any reaction be possible if all 3 , temp.,pressure,$ vol.m are kept cons†an t

Discussion

44.	A projectile is projected with velocity kve in vertically upward direction from the ground into the space. (ve is escape velocity and k<1). If air resistance is considered to be negligible then the maximum height from the centre of earth to which it can go, will be: (R=radius of earth)
Answer» A projectile is projected with velocity $k v_{e}$ in vertically upward direction from the ground into the space. ( $v_{e}$ is escape velocity and $k < 1$ ). If air resistance is considered to be negligible then the maximum height from the centre of earth to which it can go, will be: (R=radius of earth)

Discussion

45.	What is the concept of crossing over.
Answer» What is the concept of crossing over.

Discussion

46.	An object is thrown from 100 m high tower.Which motion is it having also explain why?
Answer» An object is thrown from 100 m high tower.Which motion is it having also explain why?

Discussion

47.	A positive point charge q is fixed at origin. A short dipole with a dipole moment p is placed along the x−axis far away from the origin with p pointing along the +x−axis. The kinetic energy of the dipole when it reaches distance d from origin is
Answer» A positive point charge $q$ is fixed at origin. A short dipole with a dipole moment $p$ is placed along the $x -$ axis far away from the origin with $p$ pointing along the $+ x -$ axis. The kinetic energy of the dipole when it reaches distance $d$ from origin is

Discussion

48.	In YDSE will there be any change in interference pattern if we use 3 slits instead of 2 if yes please explain?
Answer» In YDSE will there be any change in interference pattern if we use 3 slits instead of 2 if yes please explain?

Discussion

49.	A liquid is filled in a container which is kept in a room whose temperature is 20∘C. When temperature of liquid is 80∘C, it emits heat at the rate of 45 cal s−1. When temperature of liquid falls of 40∘C, using Newtons law of cooling, its rate of heat loss will be
Answer» A liquid is filled in a container which is kept in a room whose temperature is $20^{\circ} C$ . When temperature of liquid is $80^{\circ} C$ , it emits heat at the rate of $45 {cal s}^{- 1}$ . When temperature of liquid falls of $40^{\circ} C$ , using Newtons law of cooling, its rate of heat loss will be

Discussion

50.	Two wires of same length and radius, are joined end to end and loaded. The Young's modulii of the materials of the two wires are Y1 and Y2. The combination behaves as a single wire whose Young's modulus is :
Answer» Two wires of same length and radius, are joined end to end and loaded. The Young's modulii of the materials of the two wires are $Y_{1}$ and $Y_{2} .$ The combination behaves as a single wire whose Young's modulus is :

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A capacitor is charged to a certain potential difference and stores some energy. In order to double the energy stored in the capacitor, the potential difference must be increased nearly by

What are laws of motion?

An electromagnetic flow meter is used to measure the blood flow in a vessel. The diameter of vessel is 10 mm and the flux density across the electrode is π mm. If the output voltage for a particular flow rate is 1mV then the flow rate in mm3/s is ? 2.5

at what depth from the earth's surface the value of acceleration due to gravity reduces by 1% of its value on the earth surface?

The maximum intensity in Young's double-slit experiment is I0. Distance between the slits is d=5λ, where λ is the wavelength of monochromatic light used in the experiment. What will be the intensity of light in front of one of the slits on a screen at a distance D=10d ?

56.What is the moment of inertia of a plane sheet??like rectangular or a plane square sheet

17. Pressure exerted by 1 mole of an ideal gas kept in vessel of V l having root mean square speed of molecules v and mass m of each molecule is correctly given by equation

A bullet of mass 10 g moving with a speed of 20 m/s hits an ice block of mass 990 g kept on a floor and gets stuck in it. How much ice will melt if 50% of the lost KE goes to ice? (initial temperature of the ice block and bullet = 0∘C)

if the frequency of an object in uniform circular motion is doubled,its acceleration becomes

Electromagnetic radiation of frequency n, wavelength λ, travelling with velocity v in air, enters a glass slab of refractive index μ. The frequency, wavelength and velocity of light in the glass slab will be respectively.

The maximum range of a gun on a horizontal terrain is 16 km. If g=10 m/s2, then muzzle velocity of the shell must be

A particle free to move along the x-axis has potential energy given by U(x)=k[1−exp(−x)2] for −∞≤x≤+∞, where k is a positive constant of appropriate dimensions. Then

Q Provided a racing car does not lose traction,the time taken by it to race from rest through adistance depends mainly on engine's power P. Ddrivethe time t in terms of S and P, assuming that power isconstant

A planet has mass 110th of that of earth, while radius is 13rd that of earth. If a person can throw a stone on earth surface to a height of 90 m, then he will be able to throw the stone on that planet to a height (in meter)-

A particle falls from a height 'h upon a fixed horizontal plane and rebounds. If 'e' is the coefficient of restitution, then the total distance travelled before rebounding has stopped is

A particle is projected from point ′A′ , that is at a distance 4R from the centre of the Earth, with speed V0 as shown. If the particle passes grazing the earth's surface, then it is found that V0=4000×√N. Find the value of N.[Take GMR=6.4×107m2s2]

An object is seen through a glass slab of thickness 36 cm and refractive index 1.5. The observer and the slab are dipped in water of refractive index μ=43. The shift produced in the position of the object is

An object is moving with an initial velocity of 5 m/s. It starts accelerating with an acceleration of 2.5 m/s2. Calculate the displacement of the object after 10 s.

Define power.

If an electron has a wavelength λ and it has an uncertainty in its kinetic energy equal to ΔE, then what will be uncertainty in its position?

The efficiency of the thermodynamic cycle shown in figure for an ideal diatomic gas is given by the fraction 1n. Then, find n

A ray of light is incident at an angle of incidence i on one surface of a thin prism (with angle of prism A) and emerges normally from the other face. If the refractive index of the prism is n. then the angle of incidence is nearly equal to :

Two satellites of equal mass are revolving around earth in elliptical orbits of different semi-major axis. If their angular momentum about earth's centre are in the ratio 3:4, then the ratio of their areal velocity is

Match the following1. Sound waves (i) Mechanical wave2. Light waves (ii) Non-mechanical waves3. Waves on a string (iii) Transverse waves (iv) Longitudinal waves

A bullet of mass m leaves a gun of mass M kept on a smooth horizontal surface. If speed of the bullet relative to the gun is v, then recoil speed of the gun will be:

Two conducting sphere of radii r₁ and r₂ are equally charged then the ratio of their potential is

An F−x graph is shown below. Find the difference in initial and final potential energies from x=0 m to x=3 m.

46.Two capacitors C1 and C2 are connected in a circuit as shown in figure. The potential difference (VA - VB) is : (a)8V (b)-8V (c)12V (d) -12V

Find the centre of mass of a uniform L-shaped lamina (a thin flat plate) with dimensions as shown. The mass of the lamina is 3 kg.

The displacement x of a body in motion is given by x = a sin(ωt+θ). The time at which the displacement is maximum is:

Consider a ring of mass m and radius r maximum gravitational intensity on the axis of the Ring has value

,Two concentric shell have masses M and m and their radius are R and r respectively.when R>r. e What is gravational potential at apoint for whic h r

A boy of mass 25 kg stands on a board of mass 10 kg which in turn is kept on a frictionless horizontal surface. The boy makes a jump with a velocity 5 m/s in the horizontal direction with respect to the board. With what velocity does the board recoil?

can any reaction be possible if all 3 , temp.,pressure,$ vol.m are kept cons†an t

A projectile is projected with velocity kve in vertically upward direction from the ground into the space. (ve is escape velocity and k&lt;1). If air resistance is considered to be negligible then the maximum height from the centre of earth to which it can go, will be: (R=radius of earth)

What is the concept of crossing over.

An object is thrown from 100 m high tower.Which motion is it having also explain why?

A positive point charge q is fixed at origin. A short dipole with a dipole moment p is placed along the x−axis far away from the origin with p pointing along the +x−axis. The kinetic energy of the dipole when it reaches distance d from origin is

In YDSE will there be any change in interference pattern if we use 3 slits instead of 2 if yes please explain?

A liquid is filled in a container which is kept in a room whose temperature is 20∘C. When temperature of liquid is 80∘C, it emits heat at the rate of 45 cal s−1. When temperature of liquid falls of 40∘C, using Newtons law of cooling, its rate of heat loss will be

Two wires of same length and radius, are joined end to end and loaded. The Young's modulii of the materials of the two wires are Y1 and Y2. The combination behaves as a single wire whose Young's modulus is :

A projectile is projected with velocity kve in vertically upward direction from the ground into the space. (ve is escape velocity and k<1). If air resistance is considered to be negligible then the maximum height from the centre of earth to which it can go, will be: (R=radius of earth)