50278 + Interview Questions in Physics

1.	Five point charges, each of value +q are placed on five vertices of a regular hexagon of side L. The magnitude of the force on a point charge of value −q placed at the centre of the hexagon is nq24πϵ0L2. Then the value of n?
Answer» Five point charges, each of value $+ q$ are placed on five vertices of a regular hexagon of side $L$ . The magnitude of the force on a point charge of value $- q$ placed at the centre of the hexagon is $\frac{n q^{2}}{4 π ϵ_{0} L^{2}}$ . Then the value of n?

Discussion

2.	In the circuit, as shown in the figure, ε=5 V, r=1 Ω, R2=4 Ω, R3=3 Ω and C=3 μF. Find the charge on the plates of capacitor A (in μC) after achieving steady state.
Answer» In the circuit, as shown in the figure, $ε = 5 V, r = 1 Ω, R_{2} = 4 Ω, R_{3} = 3 Ω$ and $C = 3 μ F$ . Find the charge on the plates of capacitor $A$ (in $μ C$ ) after achieving steady state.

Discussion

3.	Three rods made of the same material and having the same cross-section have been joined as shown in the figure. Each rod is of the same length. The left and right ends are kept at 0∘ C and 90∘ C, respectively. The temperature of junction of the three rods will be
Answer» Three rods made of the same material and having the same cross-section have been joined as shown in the figure. Each rod is of the same length. The left and right ends are kept at $0^{\circ} C$ and $90^{\circ} C$ , respectively. The temperature of junction of the three rods will be

Discussion

4.	Classify the following as scalar and vector quantities: (i) Work done
Answer» Classify the following as scalar and vector quantities: (i) Work done

Discussion

5.	A factory produces 40 kg of calcium in two hours by electrolysis. How much aluminium can be produced by same current in 2 hours if current efficiency is 50%? (a) 22 kg(c) 9 kg(b) 18 kg(d) 27 kg(2010)
Answer» A factory produces 40 kg of calcium in two hours by electrolysis. How much aluminium can be produced by same current in 2 hours if current efficiency is 50%? (a) 22 kg(c) 9 kg(b) 18 kg(d) 27 kg(2010)

Discussion

6.	A projectile is thrown with a velocity of 50 ms−1 at an angle of 53o with the horizontal. The equation of the trajectory is given by (Take g=10 m/s2)
Answer» A projectile is thrown with a velocity of $50 m s^{- 1}$ at an angle of $53^{o}$ with the horizontal. The equation of the trajectory is given by (Take $g = 10 m / s^{2}$ )

Discussion

7.	A boy of mass 40 kg climbs up a rope with an acceleration of 2m/s^2, the tension in the rope is (g=9.8?/s^2).
Answer» A boy of mass 40 kg climbs up a rope with an acceleration of 2m/s^2, the tension in the rope is (g=9.8?/s^2).

Discussion

8.	The charge on 4μF capacitor in the given circuit is: (in μc)
Answer» The charge on $4 μ F$ capacitor in the given circuit is: $(i n μ c)$

Discussion

9.	The de brogli wave length of particle with mass 1gm and velocity 100m\s is
Answer» The de brogli wave length of particle with mass 1gm and velocity 100m\s is

Discussion

10.	How viscosity is different from the friction?
Answer» How viscosity is different from the friction?

Discussion

11.	Maximum value of electric field at a point at a distance of 2 m from the light source of power 60 watt is
Answer» Maximum value of electric field at a point at a distance of 2 m from the light source of power 60 watt is

Discussion

12.	For any three vectors a→, b→, c→ the value of a→.b→+c→×a→+ b→+ c→ is _____________.
Answer» For any three vectors $\vec{a}, \vec{b}, \vec{c}$ the value of $\vec{a} . \{(\vec{b} + \vec{c}) \times (\vec{a} + \vec{b} + \vec{c})\}$ is _____________.

Discussion

13.	A stone is dropped from a top of 40 m Height. calculate its speed after 2 seconds.also find the speed with which the stone Strikes the ground.
Answer» A stone is dropped from a top of 40 m Height. calculate its speed after 2 seconds.also find the speed with which the stone Strikes the ground.

Discussion

14.	The figure shows spherical conducting shells with inner sphere earthed. If a=8 cm and b=9 cm, then the capacitance of the system is (in pF)
Answer» The figure shows spherical conducting shells with inner sphere earthed. If $a = 8 cm$ and $b = 9 cm$ , then the capacitance of the system is (in $pF$ )

Discussion

15.	A spring is attached to the bottom of an empty swimming pool with the axis of the spring oriented vertically. A 9 kg block of wood (ρw=900 kg/m3) is fixed to the top of the spring and compresses it. Then the pool is filled with water completely covering the block. The spring is now observed to be stretched thrice as much as it had been compressed. Determine the percentage of the volume of block which is hollow. Ignore any air in the hollow space.
Answer» A spring is attached to the bottom of an empty swimming pool with the axis of the spring oriented vertically. A $9 kg$ block of wood $(ρ_{w} = 900 {kg/m}^{3})$ is fixed to the top of the spring and compresses it. Then the pool is filled with water completely covering the block. The spring is now observed to be stretched thrice as much as it had been compressed. Determine the percentage of the volume of block which is hollow. Ignore any air in the hollow space.

Discussion

16.	17. A refrigerator whose coefficient of performance is5 extracts heat from the cooling compartment atthe rate of 250J / cycle. How much heat per cycleis discharged to the room?(1) 100 J(3) 300 J(2) 50 J(4) 250 J
Answer» 17. A refrigerator whose coefficient of performance is5 extracts heat from the cooling compartment atthe rate of 250J / cycle. How much heat per cycleis discharged to the room?(1) 100 J(3) 300 J(2) 50 J(4) 250 J

Discussion

17.	Two stones A and B of masses 5 kg and 8 kg respectively are released from a height of 20 m above a thin plank.Assuming both masses sticks to the plank after collision in a time of 0.2s and a force of 600 N is required to break the plank. Choose the correct option.
Answer» Two stones A and B of masses 5 kg and 8 kg respectively are released from a height of 20 m above a thin plank.Assuming both masses sticks to the plank after collision in a time of 0.2s and a force of 600 N is required to break the plank. Choose the correct option.

Discussion

18.	A vector has 3 units of length and equal components on co-ordinate axes. The vector is
Answer» A vector has $3$ units of length and equal components on co-ordinate axes. The vector is

Discussion

19.	Find the derivative of y=√x2+1
Answer» Find the derivative of $y = \sqrt{x^{2} + 1}$

Discussion

20.	Find the average and rms values of the saw-tooth wave form as shown in figure. and report the nearest integer of the sum of two.
Answer» Find the average and rms values of the saw-tooth wave form as shown in figure. and report the nearest integer of the sum of two.

Discussion

21.	How many wavelength of kr86 are there in meter
Answer» How many wavelength of kr86 are there in meter

Discussion

22.	Four identical thin rods of mass m and length l form a square frame as shown in fig. Find the MOI of the frame about an axis passing through one of its corner and perpendicular to its plane.
Answer» Four identical thin rods of mass $m$ and length $l$ form a square frame as shown in fig. Find the MOI of the frame about an axis passing through one of its corner and perpendicular to its plane.

Discussion

23.	The equation of path of a particle, projected obliquely from the ground under gravity is given by y=2x-x^2, where x and y are in metre. the x and y axes are in horizontal and vertical directions respectively. The speed of projection is (1)2.5m/s (2)5m/s (3)10m/s (4)20m/s.
Answer» The equation of path of a particle, projected obliquely from the ground under gravity is given by y=2x-x^2, where x and y are in metre. the x and y axes are in horizontal and vertical directions respectively. The speed of projection is (1)2.5m/s (2)5m/s (3)10m/s (4)20m/s.

Discussion

24.	The element curium 96Cm248 has a mean life of 1013 s. Its primary decay modes are spontaneously fission and α decay, the former with a probability of 8% and the latter with a probability of 92%. Each fission releases 200 MeV of energy. The masses involved α decay are as follows:96Cm248=248.072220 u, 94Pu244=244.064100 u2He4=4.002603 u.Calculate the power output from a sample of 1020 Cm atoms (1u=931 MeVc2).
Answer» The element curium $_{96} {Cm}^{248}$ has a mean life of $10^{13} s$ . Its primary decay modes are spontaneously fission and $α$ decay, the former with a probability of $8 %$ and the latter with a probability of $92 %$ . Each fission releases $200 MeV$ of energy. The masses involved $α$ decay are as follows: $_{96} {Cm}^{248} = 248.072220 u,_{94} {Pu}^{244} = 244.064100 u_{2} {He}^{4} = 4.002603 u .$ Calculate the power output from a sample of $10^{20}$ $Cm$ atoms $(1 u = 931 \frac{MeV}{c^{2}})$ .

Discussion

25.	In the given situation, two blocks A and B are arranged as shown in the figure. M is a fixed pulley and N is a movable pulley. The system is released from rest. What is the relationship between accelerations for the blocks A and B?
Answer» In the given situation, two blocks A and B are arranged as shown in the figure. M is a fixed pulley and N is a movable pulley. The system is released from rest. What is the relationship between accelerations for the blocks A and B?

25.

In the given situation, two blocks A and B are arranged as shown in the figure. M is a fixed pulley and N is a movable pulley. The system is released from rest. What is the relationship between accelerations for the blocks A and B?

Answer»

In the given situation, two blocks A and B are arranged as shown in the figure. M is a fixed pulley and N is a movable pulley. The system is released from rest. What is the relationship between accelerations for the blocks A and B?

Discussion

26.	When a hydrogen atom is raised from the ground state to third state (1) Both kinetie energy and potential energy increases(2), Both kinetic energy and potential energy decreases (3) Potential energy increases and kinetic energy decreases (4) Potential energy decreases and kineltic energy increases
Answer» When a hydrogen atom is raised from the ground state to third state (1) Both kinetie energy and potential energy increases(2), Both kinetic energy and potential energy decreases (3) Potential energy increases and kinetic energy decreases (4) Potential energy decreases and kineltic energy increases

Discussion

27.	In a Young's double slit experiment, 15 fringes are observed on a small portion of the screen, when light of wavelength 500 nm is used. Ten fringes are observed on the same section of the screen, when another light source of wavelength λ is used. Then the value of λ is (in nm)
Answer» In a Young's double slit experiment, $15$ fringes are observed on a small portion of the screen, when light of wavelength $500 nm$ is used. Ten fringes are observed on the same section of the screen, when another light source of wavelength $λ$ is used. Then the value of $λ$ is $(in nm)$

Discussion

28.	The charge on plate of capacitor varies as q=qosinwt and seperation between plates in very small as compared to area of the plate.The peak value of displacement current through capacitor
Answer» The charge on plate of capacitor varies as q=qosinwt and seperation between plates in very small as compared to area of the plate.The peak value of displacement current through capacitor

Discussion

29.	An oil with a viscosity of μ and density ρ flows in a pipe of diameter D. The pressure drop ΔP needed to produce a flow rate of Q for laminar flow is given asΔP=kQμLD4,L is length of pipeThe value of k is _____. 40.74
Answer» An oil with a viscosity of $μ$ and density $ρ$ flows in a pipe of diameter $D$ . The pressure drop $Δ P$ needed to produce a flow rate of $Q$ for laminar flow is given as $Δ P = k \frac{Q μ L}{D^{4}}, L$ is length of pipe The value of $k$ is _____. 40.74

Discussion

30.	Find the dispersive power of flint glass. The refractive indices of flint glass for red, yellow and violet lights are 1.613, 1.620 and 1.632 respectively.
Answer» Find the dispersive power of flint glass. The refractive indices of flint glass for red, yellow and violet lights are $1.613, 1.620$ and $1.632$ respectively.

Discussion

31.	A particle of mass 0.2 kg is moving in one dimension under a force that delivers a constant power 0.5 W to the particle. If the initial speed (in ms−1) of the particle is zero, the speed (in ms−1) after 5 s is
Answer» A particle of mass $0.2 kg$ is moving in one dimension under a force that delivers a constant power 0.5 W to the particle. If the initial speed $({in ms}^{- 1})$ of the particle is zero, the speed $({in ms}^{- 1})$ after 5 s is

Discussion

32.	A block of mass m is placed on the plank of mass M as shown in the figure. Coefficient of friction between the surfaces of m and M is μ and there is no friction between ground and M. A horizontal force F = kt is applied on the block, were k is a constant and t is the time. Which of the following graphs shows the acceleration of the plank?
Answer» A block of mass m is placed on the plank of mass M as shown in the figure. Coefficient of friction between the surfaces of m and M is $μ$ and there is no friction between ground and M. A horizontal force F = kt is applied on the block, were k is a constant and t is the time. Which of the following graphs shows the acceleration of the plank?

32.

A block of mass m is placed on the plank of mass M as shown in the figure. Coefficient of friction between the surfaces of m and M is μ and there is no friction between ground and M. A horizontal force F = kt is applied on the block, were k is a constant and t is the time. Which of the following graphs shows the acceleration of the plank?

Answer»

A block of mass m is placed on the plank of mass M as shown in the figure. Coefficient of friction between the
surfaces of m and M is $μ$ and there is no friction between ground and M. A horizontal force F = kt is applied on the
block, were k is a constant and t is the time. Which of the following graphs shows the acceleration of the plank?

Discussion

33.	A triode valve has an amplification factor of 20 and its plate is given a potential of 300 V . What should be the grid voltage to reduce plate current to zero?(
Answer» A triode valve has an amplification factor of 20 and its plate is given a potential of 300 V . What should be the grid voltage to reduce plate current to zero?(

Discussion

34.	If a graph is plotted by taking spectral emissive power along y axis and wavelength along x axis then the area below the graph above the wavelength axis is1)Emissivity2)Total intensity of radiation 3)Diffusivity 4) Solar constant
Answer» If a graph is plotted by taking spectral emissive power along y axis and wavelength along x axis then the area below the graph above the wavelength axis is 1)Emissivity 2)Total intensity of radiation 3)Diffusivity 4) Solar constant

Discussion

35.	A uniform chain of length l and mass m overhangs a smooth table with two third part lying on the table. Find the kinetic energy of the chain as it completely slips off the table.
Answer» A uniform chain of length $l$ and mass $m$ overhangs a smooth table with two third part lying on the table. Find the kinetic energy of the chain as it completely slips off the table.

Discussion

36.	A machine gun fires a bullet of mass 65 g with a32velocity of 1300 m/s. The man holding it can exerta maximum force of 169 N on the gun. Thenumber of bullets he can fire per second will be(1) 1H(3) 3(2) 2(4) 4
Answer» A machine gun fires a bullet of mass 65 g with a32velocity of 1300 m/s. The man holding it can exerta maximum force of 169 N on the gun. Thenumber of bullets he can fire per second will be(1) 1H(3) 3(2) 2(4) 4

Discussion

37.	The water drops are falling at a regular intervals from a tap which is h meters above the ground .The third drop was about to leave the tap when the first drop touches the ground. If the distance between the second and first drop is 3.75 meters, what is the height h??
Answer» The water drops are falling at a regular intervals from a tap which is h meters above the ground .The third drop was about to leave the tap when the first drop touches the ground. If the distance between the second and first drop is 3.75 meters, what is the height h??

Discussion

38.	1joule of energy is to be converted into new system of units in which length is measured in 10 metre ,mass in 10 kg and time in 1 minute . The numerical value of 1 joule in the new system is ?
Answer» 1joule of energy is to be converted into new system of units in which length is measured in 10 metre ,mass in 10 kg and time in 1 minute . The numerical value of 1 joule in the new system is ?

Discussion

39.	∫x2+1x4+x2+1dx is equal to (where C is integration constant)
Answer» $\int \frac{x^{2} + 1}{x^{4} + x^{2} + 1} d x$ is equal to (where $C$ is integration constant)

Discussion

40.	A double slit experiment is performed with sodium light of wavelength 600 nm and interference pattern is observed on a screen 100 cm away from the slits. The 4th dark fringe is at a distance of 7 mm from the central maximum. Find the separation between the slits.
Answer» A double slit experiment is performed with sodium light of wavelength $600 nm$ and interference pattern is observed on a screen $100 cm$ away from the slits. The $4^{th}$ dark fringe is at a distance of $7 mm$ from the central maximum. Find the separation between the slits.

Discussion

41.	A force starts acting on a spring block system. At a stretch when x=mgk ( WFext and WFs are works done by Fext and spring force)
Answer» A force starts acting on a spring block system. At a stretch when $x = \frac{m g}{k}$ ( $W_{F_{e x t}}$ and $W_{F_{s}}$ are works done by $F_{e x t}$ and spring force)

Discussion

42.	If −−→PQ=3^i+2^j−^k and coordinates of P are (1,−1,2). Then the coordinates of Q are
Answer» If $- - \to P Q = 3^i + 2^j -^k$ and coordinates of $P$ are $(1, - 1, 2) .$ Then the coordinates of $Q$ are

Discussion

43.	The effective capacitance between A and B is
Answer» The effective capacitance between $A$ and $B$ is

Discussion

44.	5.A 6kg bomb at rest explodes into 3 pieces P QR .If P flies with speed 30 m/s and Q with speed 40 m/s making an angle 90 with the direction of P. The angle between the direction of motion of P and R
Answer» 5.A 6kg bomb at rest explodes into 3 pieces P QR .If P flies with speed 30 m/s and Q with speed 40 m/s making an angle 90 with the direction of P. The angle between the direction of motion of P and R

Discussion

45.	What is the co-ordination no. of edge centred and end centered unit cell?
Answer» What is the co-ordination no. of edge centred and end centered unit cell?

Discussion

46.	A charge Q is placed at the centre of an imaginary hemispherical surface. Using symmetry arguments and the Gauss's law, find the flux of the electric field due to this charge through the surface of the hemisphere (figure 30-E3).
Answer» A charge Q is placed at the centre of an imaginary hemispherical surface. Using symmetry arguments and the Gauss's law, find the flux of the electric field due to this charge through the surface of the hemisphere (figure 30-E3).

46.

A charge Q is placed at the centre of an imaginary hemispherical surface. Using symmetry arguments and the Gauss's law, find the flux of the electric field due to this charge through the surface of the hemisphere (figure 30-E3).

Answer»

A charge Q is placed at the centre of an imaginary hemispherical surface. Using symmetry arguments and the Gauss's law, find the flux of the electric field due to this charge through the surface of the hemisphere (figure 30-E3).

Discussion

47.	ntIn an LC series circuit , if the switch is closed at t=0, find the equation for instantaneous current;n ntQ max =100 micro C;n ntL=40mH,n ntC=100 micro Fn ntn ntA) -50sin(500t) mAn ntB) -50sin(500t) microAn ntC) 100sin(500t) mAn ntD) 100sin(500t) microAn
Answer» ntIn an LC series circuit , if the switch is closed at t=0, find the equation for instantaneous current;n ntQ max =100 micro C;n ntL=40mH,n ntC=100 micro Fn ntn ntA) -50sin(500t) mAn ntB) -50sin(500t) microAn ntC) 100sin(500t) mAn ntD) 100sin(500t) microAn

Discussion

48.	What should be the capacitance of a capacitor capable of storing one joule of energy when used with a 100 v dc supply?
Answer» What should be the capacitance of a capacitor capable of storing one joule of energy when used with a 100 v dc supply?

Discussion

49.	A cylinder of radius R made of a material of thermal conductivity k1 is surrounded by a cylindrical shell of inner radius R and outer radius 2R made of a material of thermal conductivity k2. The two ends of the combined system are maintained at two different temperatures. There is no loss of heat across the cylindrical surface and the system is in steady state. The effective thermal conductivity of the system is
Answer» A cylinder of radius $R$ made of a material of thermal conductivity $k_{1}$ is surrounded by a cylindrical shell of inner radius $R$ and outer radius $2 R$ made of a material of thermal conductivity $k_{2}$ . The two ends of the combined system are maintained at two different temperatures. There is no loss of heat across the cylindrical surface and the system is in steady state. The effective thermal conductivity of the system is

Discussion

50.	A small element &quotl" is cut from a circular ring of radius &quota" and &quotLambda" charge per unit length. The net electric field at the centre of the ring is?
Answer» A small element "l" is cut from a circular ring of radius "a" and "Lambda" charge per unit length. The net electric field at the centre of the ring is?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Five point charges, each of value +q are placed on five vertices of a regular hexagon of side L. The magnitude of the force on a point charge of value −q placed at the centre of the hexagon is nq24πϵ0L2. Then the value of n?

In the circuit, as shown in the figure, ε=5 V, r=1 Ω, R2=4 Ω, R3=3 Ω and C=3 μF. Find the charge on the plates of capacitor A (in μC) after achieving steady state.

Three rods made of the same material and having the same cross-section have been joined as shown in the figure. Each rod is of the same length. The left and right ends are kept at 0∘ C and 90∘ C, respectively. The temperature of junction of the three rods will be

Classify the following as scalar and vector quantities: (i) Work done

A factory produces 40 kg of calcium in two hours by electrolysis. How much aluminium can be produced by same current in 2 hours if current efficiency is 50%? (a) 22 kg(c) 9 kg(b) 18 kg(d) 27 kg(2010)

A projectile is thrown with a velocity of 50 ms−1 at an angle of 53o with the horizontal. The equation of the trajectory is given by (Take g=10 m/s2)

A boy of mass 40 kg climbs up a rope with an acceleration of 2m/s^2, the tension in the rope is (g=9.8?/s^2).

The charge on 4μF capacitor in the given circuit is: (in μc)

The de brogli wave length of particle with mass 1gm and velocity 100m\s is

How viscosity is different from the friction?

Maximum value of electric field at a point at a distance of 2 m from the light source of power 60 watt is

For any three vectors a→, b→, c→ the value of a→.b→+c→×a→+ b→+ c→ is _____________.

A stone is dropped from a top of 40 m Height. calculate its speed after 2 seconds.also find the speed with which the stone Strikes the ground.

The figure shows spherical conducting shells with inner sphere earthed. If a=8 cm and b=9 cm, then the capacitance of the system is (in pF)

17. A refrigerator whose coefficient of performance is5 extracts heat from the cooling compartment atthe rate of 250J / cycle. How much heat per cycleis discharged to the room?(1) 100 J(3) 300 J(2) 50 J(4) 250 J

Two stones A and B of masses 5 kg and 8 kg respectively are released from a height of 20 m above a thin plank.Assuming both masses sticks to the plank after collision in a time of 0.2s and a force of 600 N is required to break the plank. Choose the correct option.

A vector has 3 units of length and equal components on co-ordinate axes. The vector is

Find the derivative of y=√x2+1

Find the average and rms values of the saw-tooth wave form as shown in figure. and report the nearest integer of the sum of two.

How many wavelength of kr86 are there in meter

Four identical thin rods of mass m and length l form a square frame as shown in fig. Find the MOI of the frame about an axis passing through one of its corner and perpendicular to its plane.

The equation of path of a particle, projected obliquely from the ground under gravity is given by y=2x-x^2, where x and y are in metre. the x and y axes are in horizontal and vertical directions respectively. The speed of projection is (1)2.5m/s (2)5m/s (3)10m/s (4)20m/s.

In the given situation, two blocks A and B are arranged as shown in the figure. M is a fixed pulley and N is a movable pulley. The system is released from rest. What is the relationship between accelerations for the blocks A and B?

When a hydrogen atom is raised from the ground state to third state (1) Both kinetie energy and potential energy increases(2), Both kinetic energy and potential energy decreases (3) Potential energy increases and kinetic energy decreases (4) Potential energy decreases and kineltic energy increases

In a Young's double slit experiment, 15 fringes are observed on a small portion of the screen, when light of wavelength 500 nm is used. Ten fringes are observed on the same section of the screen, when another light source of wavelength λ is used. Then the value of λ is (in nm)

The charge on plate of capacitor varies as q=qosinwt and seperation between plates in very small as compared to area of the plate.The peak value of displacement current through capacitor

An oil with a viscosity of μ and density ρ flows in a pipe of diameter D. The pressure drop ΔP needed to produce a flow rate of Q for laminar flow is given asΔP=kQμLD4,L is length of pipeThe value of k is _____. 40.74

Find the dispersive power of flint glass. The refractive indices of flint glass for red, yellow and violet lights are 1.613, 1.620 and 1.632 respectively.

A particle of mass 0.2 kg is moving in one dimension under a force that delivers a constant power 0.5 W to the particle. If the initial speed (in ms−1) of the particle is zero, the speed (in ms−1) after 5 s is

A triode valve has an amplification factor of 20 and its plate is given a potential of 300 V . What should be the grid voltage to reduce plate current to zero?(

If a graph is plotted by taking spectral emissive power along y axis and wavelength along x axis then the area below the graph above the wavelength axis is1)Emissivity2)Total intensity of radiation 3)Diffusivity 4) Solar constant

A uniform chain of length l and mass m overhangs a smooth table with two third part lying on the table. Find the kinetic energy of the chain as it completely slips off the table.

A machine gun fires a bullet of mass 65 g with a32velocity of 1300 m/s. The man holding it can exerta maximum force of 169 N on the gun. Thenumber of bullets he can fire per second will be(1) 1H(3) 3(2) 2(4) 4

The water drops are falling at a regular intervals from a tap which is h meters above the ground .The third drop was about to leave the tap when the first drop touches the ground. If the distance between the second and first drop is 3.75 meters, what is the height h??

1joule of energy is to be converted into new system of units in which length is measured in 10 metre ,mass in 10 kg and time in 1 minute . The numerical value of 1 joule in the new system is ?

∫x2+1x4+x2+1dx is equal to (where C is integration constant)

A double slit experiment is performed with sodium light of wavelength 600 nm and interference pattern is observed on a screen 100 cm away from the slits. The 4th dark fringe is at a distance of 7 mm from the central maximum. Find the separation between the slits.

A force starts acting on a spring block system. At a stretch when x=mgk ( WFext and WFs are works done by Fext and spring force)

If −−→PQ=3^i+2^j−^k and coordinates of P are (1,−1,2). Then the coordinates of Q are

The effective capacitance between A and B is

5.A 6kg bomb at rest explodes into 3 pieces P QR .If P flies with speed 30 m/s and Q with speed 40 m/s making an angle 90 with the direction of P. The angle between the direction of motion of P and R

What is the co-ordination no. of edge centred and end centered unit cell?

A charge Q is placed at the centre of an imaginary hemispherical surface. Using symmetry arguments and the Gauss's law, find the flux of the electric field due to this charge through the surface of the hemisphere (figure 30-E3).

ntIn an LC series circuit , if the switch is closed at t=0, find the equation for instantaneous current;n ntQ max =100 micro C;n ntL=40mH,n ntC=100 micro Fn ntn ntA) -50sin(500t) mAn ntB) -50sin(500t) microAn ntC) 100sin(500t) mAn ntD) 100sin(500t) microAn

What should be the capacitance of a capacitor capable of storing one joule of energy when used with a 100 v dc supply?

A small element &quotl" is cut from a circular ring of radius &quota" and &quotLambda" charge per unit length. The net electric field at the centre of the ring is?