50278 + Interview Questions in Physics Page 53 InterviewSolution

2601.	If the Value of resistance is 10.845ohm and the value of current is 3.23 Amp, the value of potential with significant numbers would be
Answer» If the Value of resistance is 10.845ohm and the value of current is 3.23 Amp, the value of potential with significant numbers would be

Discussion

2602.	15.Three particle of masses m1-1.2kg, m2-2.5kg, m3-3.4kg form an equilateral triangle of edge length a=140cm. what is the centre of mass of three particles?
Answer» 15.Three particle of masses m1-1.2kg, m2-2.5kg, m3-3.4kg form an equilateral triangle of edge length a=140cm. what is the centre of mass of three particles?

Discussion

2603.	25. A block of mass M moving with speed u collides elastically with block B of mass m which is connected to block C of mass m with a spring. When the compression in spring is maximum, the velocity of block C with respect to block A is. Neglect friction.
Answer» 25. A block of mass M moving with speed u collides elastically with block B of mass m which is connected to block C of mass m with a spring. When the compression in spring is maximum, the velocity of block C with respect to block A is. Neglect friction.

Discussion

2604.	Given electrode potentials:Fe^3++e^------->Fe^2+E^°=0.771VI2+2e^------>2I^-E^°=0.536VE^°2Fe^3++2I^--------->2Fe^2-+I2Standard Electrode potential
Answer» Given electrode potentials:Fe^3++e^------->Fe^2+E^°=0.771VI2+2e^------>2I^-E^°=0.536VE^°2Fe^3++2I^--------->2Fe^2-+I2Standard Electrode potential

Discussion

2605.	18.A ball is thrown vertically upwards with certain initial velocity. Assume that there is no air resistance. Draw the following graph- Kinetic energy V/S Time
Answer» 18.A ball is thrown vertically upwards with certain initial velocity. Assume that there is no air resistance. Draw the following graph- Kinetic energy V/S Time

Discussion

2606.	If coefficient of friction between all surfaces is 0.4, then find the minimum force F required to just keep the system from moving. [Take g=10 m/s2]
Answer» If coefficient of friction between all surfaces is 0.4, then find the minimum force $F$ required to just keep the system from moving. [Take $g = 10 {m/s}^{2}$ ]

Discussion

2607.	The position of a particle moving along the x-axis is expressed as x=at3+bt2+ct+d. The initial acceleration of the particle is
Answer» The position of a particle moving along the $x$ -axis is expressed as $x = a t^{3} + b t^{2} + c t + d$ . The initial acceleration of the particle is

Discussion

2608.	Two bodies of the same mass are moving with the same speed, but in different directions in a plane. They have a completely inelastic collision and move together thereafter with a final speed which is half of their initial speed. The angle between the initial velocities of the two bodies (in degree) is
Answer» Two bodies of the same mass are moving with the same speed, but in different directions in a plane. They have a completely inelastic collision and move together thereafter with a final speed which is half of their initial speed. The angle between the initial velocities of the two bodies (in degree) is

Discussion

2609.	What do you mean by optically denser and optically rarer mediums?
Answer» What do you mean by optically denser and optically rarer mediums?

Discussion

2610.	A vertical cylinder with a freely floating piston contains 0.1 kg air at 1.2 bar and a small electrical resistor. The resistor is wired to an external 12 volt battery. When a current of 1.5 amps is passed through the resistor fo 90 secs, the piston sweeps a volume of 0.01m3. Assume (i) piston and the cylinder are insulated and (ii) air behaves as an ideal gas with cv=700J/kgK. Find the rise in temperature of air.6
Answer» A vertical cylinder with a freely floating piston contains 0.1 kg air at 1.2 bar and a small electrical resistor. The resistor is wired to an external 12 volt battery. When a current of 1.5 amps is passed through the resistor fo 90 secs, the piston sweeps a volume of $0.01 m^{3}$ . Assume (i) piston and the cylinder are insulated and (ii) air behaves as an ideal gas with $c_{v} = 700 J / k g K$ . Find the rise in temperature of air. 6

Discussion

2611.	A particle of mass m moving in the x− direction with speed 2v is hit by another particle of mass 2m moving in the y− direction with speed v. If the collision is perfectly inelastic, the percentage loss in energy during the collision is close to
Answer» A particle of mass $m$ moving in the $x -$ direction with speed $2 v$ is hit by another particle of mass $2 m$ moving in the $y -$ direction with speed $v$ . If the collision is perfectly inelastic, the percentage loss in energy during the collision is close to

Discussion

2612.	A level was set up at point 'C' at a distance of 100m from 'A' and 1000 m from 'B'. The staff reading on the staff kept at A was 0.445 m and that on the staff held at B was 2.845m. The true difference in elevations (in m, correct upto three decimal places) of A and B is _________2.3334
Answer» A level was set up at point 'C' at a distance of 100m from 'A' and 1000 m from 'B'. The staff reading on the staff kept at A was 0.445 m and that on the staff held at B was 2.845m. The true difference in elevations (in m, correct upto three decimal places) of A and B is _________ 2.3334

Discussion

2613.	41. Photon having energy equal to the binding energy of the 4th state of He+ ion is used to eject an electron from the metal surface of work function 1.4ev. If electrons are further accelerated through the potential difference of 4V then minimum value of de broglie wavelength associated with the electron is
Answer» 41. Photon having energy equal to the binding energy of the 4th state of He+ ion is used to eject an electron from the metal surface of work function 1.4ev. If electrons are further accelerated through the potential difference of 4V then minimum value of de broglie wavelength associated with the electron is

Discussion

2614.	When is a body said to have uniform velocity?
Answer» When is a body said to have uniform velocity?

Discussion

2615.	In the diagram shown below, all the three rods are of equal length L and same mass M. The system is rotated such that the rod B is the axis. What is the moment of inertia of the system?
Answer» In the diagram shown below, all the three rods are of equal length $L$ and same mass $M$ . The system is rotated such that the rod $B$ is the axis. What is the moment of inertia of the system?

Discussion

2616.	Point charges q, q, -2q are placed at the corners of an equilateral triangle ABC of side l. The magnitude of net electric dipole moment of the system is
Answer» Point charges q, q, -2q are placed at the corners of an equilateral triangle ABC of side l. The magnitude of net electric dipole moment of the system is

Discussion

2617.	A 95 kg halfback (HB) makes a turn on the foot ball field. The half back sweeps out a path that is a portion of a circle with a radius of 12 m The halfback makes a quarter turn on a circular path in 2.1 seconds. The net force acting on the half back will be:
Answer» A $95 k g$ halfback (HB) makes a turn on the foot ball field. The half back sweeps out a path that is a portion of a circle with a radius of $12 m$ The halfback makes a quarter turn on a circular path in $2.1$ seconds. The net force acting on the half back will be:

Discussion

2618.	An isothermal surface is taken on an xy plane. Find the direction along which there will be largest change in temperature.
Answer» An isothermal surface is taken on an $x y$ plane. Find the direction along which there will be largest change in temperature.

Discussion

2619.	127.A uniform wire of 8 meter long and of resistence 5 ohm per metre is bent into the form of a square ABCD. The adjacent corners A and B are connected to a battery of e.m.f 2 volt and internal resistence. 5 ohm .Find the current along AB??
Answer» 127.A uniform wire of 8 meter long and of resistence 5 ohm per metre is bent into the form of a square ABCD. The adjacent corners A and B are connected to a battery of e.m.f 2 volt and internal resistence. 5 ohm .Find the current along AB??

Discussion

2620.	an object of mass m moves with cons†an t speed in a circular path of radius R under an action of a force of cons†an t magnitude F . the kinetic energy of obect is.
Answer» an object of mass m moves with cons†an t speed in a circular path of radius R under an action of a force of cons†an t magnitude F . the kinetic energy of obect is.

Discussion

2621.	Axis of a hollow cone shown in figure is vertical. It’s base radius is ‘R’. It is kept in a uniform electric field E parallel to its axis.The magnitude of flux through curved part of the cone?
Answer» Axis of a hollow cone shown in figure is vertical. It’s base radius is ‘R’. It is kept in a uniform electric field E parallel to its axis. The magnitude of flux through curved part of the cone?

2621.

Axis of a hollow cone shown in figure is vertical. It’s base radius is ‘R’. It is kept in a uniform electric field E parallel to its axis.The magnitude of flux through curved part of the cone?

Answer»

Axis of a hollow cone shown in figure is vertical. It’s base radius is ‘R’. It is kept in a uniform electric field E parallel to its axis.

The magnitude of flux through curved part of the cone?

Discussion

2622.	37.Write dimensional unit of mass using the formula f=ma
Answer» 37.Write dimensional unit of mass using the formula f=ma

Discussion

2623.	If f(1)=1,f′(1)=3, then the derivative of f(f(x))+(f(f(x)))2+f(x) w.r.t. x at x=1 is
Answer» If $f (1) = 1, f^{'} (1) = 3,$ then the derivative of $f (f (x)) + {(f (f (x)))}^{2} + f (x)$ w.r.t. $x$ at $x = 1$ is

Discussion

2624.	in the graph of kinetic energy and velocity, we get a a curve line but the is m constant?
Answer» in the graph of kinetic energy and velocity, we get a a curve line but the is m constant?

Discussion

2625.	the length of a string tied to two rigid support is 40cm maximum length of stationary wave produced on it is
Answer» the length of a string tied to two rigid support is 40cm maximum length of stationary wave produced on it is

Discussion

2626.	Two inductors, each of inductance L are connected in parallel. One more inductor of inductance 5 mH is connected in series with this combination. Now, the effective inductance is 15 mH. The value of L is
Answer» Two inductors, each of inductance $L$ are connected in parallel. One more inductor of inductance $5 mH$ is connected in series with this combination. Now, the effective inductance is $15 mH$ . The value of $L$ is

Discussion

2627.	Consider the fission of 23892U by fast neutrons. In one fission event,no neutrons are emitted and the final end products, after the betadecay of the primary fragments, are 14058Ce and 9944Ru. Calculate Qfor this fission process. The relevant atomic and particle massesarem(23892U ) =238.05079 um(14058Ce ) =139.90543 um(9944Ru ) = 98.90594 u
Answer» Consider the fission of 23892U by fast neutrons. In one fission event,no neutrons are emitted and the final end products, after the betadecay of the primary fragments, are 14058Ce and 9944Ru. Calculate Qfor this fission process. The relevant atomic and particle massesarem(23892U ) =238.05079 um(14058Ce ) =139.90543 um(9944Ru ) = 98.90594 u

Discussion

2628.	The figure here shows four paths on a p-V diagrams along which as gas can be taken from state i to state f. Rank the paths according to - 1.the change ΔEint in the internal energy of the gas.
Answer» The figure here shows four paths on a p-V diagrams along which as gas can be taken from state i to state f. Rank the paths according to - 1.the change $Δ E_{i n t}$ in the internal energy of the gas.

2628.

The figure here shows four paths on a p-V diagrams along which as gas can be taken from state i to state f. Rank the paths according to - 1.the change ΔEint in the internal energy of the gas.

Answer»

The figure here shows four paths on a p-V diagrams along which as gas can be taken from state i to state f. Rank the paths according to -

1.the change $Δ E_{i n t}$ in the internal energy of the gas.

Discussion

2629.	An ideal gas is taken through a cycle 1231 (see figure) and the efficiency of the cycle was found to be 25%. When the same gas goes through the cycle 1341, the efficiency is 10%. Find the efficiency of the cycle 12341.
Answer» An ideal gas is taken through a cycle $1231$ (see figure) and the efficiency of the cycle was found to be $25 %$ . When the same gas goes through the cycle $1341$ , the efficiency is $10 %$ . Find the efficiency of the cycle $12341$ .

Discussion

2630.	In Young's double-slit experiment , the intensity of light at a point on the screen where the path difference is λ is K units. What is the intensity of light at a point where the path difference is λ/3; λ being the wavelength of light used?
Answer» In Young's double-slit experiment , the intensity of light at a point on the screen where the path difference is $λ$ is K units. What is the intensity of light at a point where the path difference is $λ / 3;$ $λ$ being the wavelength of light used?

Discussion

2631.	ntMoment of inertia of uniform circular disc about a diameter is I .its moment of inertia about an axis perpendicular to its plame passing through a point on its rim ?n ntExplain in detail kindlyn
Answer» ntMoment of inertia of uniform circular disc about a diameter is I .its moment of inertia about an axis perpendicular to its plame passing through a point on its rim ?n ntExplain in detail kindlyn

Discussion

2632.	A uniform disc of mass m and radius R is cut from the right side of the larger disc of mass M and radius 2R and kept on the left side as shown in the figure (shaded portion). Find the COM of the system w.r.t the origin O.
Answer» A uniform disc of mass $m$ and radius $R$ is cut from the right side of the larger disc of mass $M$ and radius $2 R$ and kept on the left side as shown in the figure (shaded portion). Find the $C O M$ of the system w.r.t the origin $O$ .

Discussion

2633.	Find out the Fnet on 5th charge particle placed at apex of square pyramid of charges ( all charges are q)Where one of the charge present at origin
Answer» Find out the Fnet on 5th charge particle placed at apex of square pyramid of charges ( all charges are q) Where one of the charge present at origin

Discussion

2634.	a metal whose temp. coefficient of resistivity is 0.0005/degree celsius is heated from 100 degree to 1100 degree celesius. By what factor does the mobility of electron in the metal change due to this change in temperature
Answer» a metal whose temp. coefficient of resistivity is 0.0005/degree celsius is heated from 100 degree to 1100 degree celesius. By what factor does the mobility of electron in the metal change due to this change in temperature

Discussion

2635.	A ball of mass m is dropped from height h on a horizontal floor which collides with it with speed u. If coefficient of restitution in floor is e, then impulse imparted to ball by the floor on its second rebounce is(1) meu(2) meu (e + 1)(3) me^2u (e + 1)(4) me^2u (e-1)
Answer» A ball of mass m is dropped from height h on a horizontal floor which collides with it with speed u. If coefficient of restitution in floor is e, then impulse imparted to ball by the floor on its second rebounce is(1) meu(2) meu (e + 1)(3) me^2u (e + 1)(4) me^2u (e-1)

Discussion

2636.	A series LCR with R=20 Ω, L=1.5 H and C=5 μF is connected to a variable frequency 200 V AC supply. When the frequency of the supply is equal to the natural frequency of the circuit, the average power transferred to the circuit in one complete cycle is n×103 W. The value of n is
Answer» A series $L C R$ with $R = 20 Ω$ , $L = 1.5 H$ and $C = 5 μ F$ is connected to a variable frequency $200 V$ $A C$ supply. When the frequency of the supply is equal to the natural frequency of the circuit, the average power transferred to the circuit in one complete cycle is $n \times 10^{3} W$ . The value of $n$ is

Discussion

2637.	One Plano-convex and one plano-concave lens of same radius of curvature ′R′ but of different materials are joined side by side as shown in the figure. If the refractive index of the material of 1 is μ1 and that of 2 is μ2, then the focal length of the combination is :
Answer» One Plano-convex and one plano-concave lens of same radius of curvature $^{'} R^{'}$ but of different materials are joined side by side as shown in the figure. If the refractive index of the material of $1$ is $μ_{1}$ and that of $2$ is $μ_{2}$ , then the focal length of the combination is :

Discussion

2638.	A crown glass prism of angle 5∘ is to be combined with a flint glass prism in such a way that the mean ray passes undeviated. The angle of flint glass prism is A′ and angular deviation produced by the combination when white light goes through it is δ. Refractive indices for red, yellow and violet light are 1.514, 1.517 and 1.523 respectively for crown glass and 1.613, 1.620 and 1.632 for flint glass. Then :
Answer» A crown glass prism of angle $5^{\circ}$ is to be combined with a flint glass prism in such a way that the mean ray passes undeviated. The angle of flint glass prism is $A^{'}$ and angular deviation produced by the combination when white light goes through it is $δ$ . Refractive indices for red, yellow and violet light are $1.514, 1.517$ and $1.523$ respectively for crown glass and $1.613, 1.620$ and $1.632$ for flint glass. Then :

Discussion

2639.	If velocity of a particle is v(t)=(9−3t) m/s, the average speed and magnitude of average velocity of the particle in 4 sec respectively are
Answer» If velocity of a particle is $v (t) = (9 - 3 t) m/s$ , the average speed and magnitude of average velocity of the particle in $4 sec$ respectively are

Discussion

2640.	2. A force F=(2i+3j-5k)N acts at a point r1=(2i+4j+7k)m. The torque of the force aboit the point r2=(i+2j+3k)m is?
Answer» 2. A force F=(2i+3j-5k)N acts at a point r1=(2i+4j+7k)m. The torque of the force aboit the point r2=(i+2j+3k)m is?

Discussion

2641.	11) Some heat is supplied to an ideal monoatomic gas under constant pressure. The part of the heat which goes to increase its internal energy will bea) 2/3b) 3/5c) 2/7d) 5/7
Answer» 11) Some heat is supplied to an ideal monoatomic gas under constant pressure. The part of the heat which goes to increase its internal energy will be a) 2/3 b) 3/5 c) 2/7 d) 5/7

Discussion

2642.	the velocity time graph of a particle moving along a straight line is shown as in figure the rate of acceleration and deceleration is constant and it is equal to 5 M per second square. If the average velocity during the motion is 20 m per second, then
Answer» the velocity time graph of a particle moving along a straight line is shown as in figure the rate of acceleration and deceleration is constant and it is equal to 5 M per second square. If the average velocity during the motion is 20 m per second, then

Discussion

2643.	Two trains, A and B, each 50 m long, are approaching a meeting point travelling with velocities 10 m/s and 15 m/s respectively. The tracks of the two trains are perpendicular to each other and both trains are 500 meters away from the meeting point. How far will be the train A from meeting point when train B crosses the meeting point?
Answer» Two trains, A and B, each $50 m$ long, are approaching a meeting point travelling with velocities $10 m / s$ and $15 m / s$ respectively. The tracks of the two trains are perpendicular to each other and both trains are $500$ meters away from the meeting point. How far will be the train A from meeting point when train B crosses the meeting point?

Discussion

2644.	A bullet of mass m2 is fired from a gun of mass m1 with horizontal velocity v. A plane mirror is fixed to the gun facing towards the bullet. The velocity of the image of the bullet formed by the plane mirror with respect to the bullet is (Neglect the mass of mirror)
Answer» A bullet of mass $m_{2}$ is fired from a gun of mass $m_{1}$ with horizontal velocity $v$ . A plane mirror is fixed to the gun facing towards the bullet. The velocity of the image of the bullet formed by the plane mirror with respect to the bullet is (Neglect the mass of mirror)

Discussion

2645.	A particle A moves along a corcle of radius R=50 cm so that its radius vector relative to an arbitrary point O on the circle rotates with cons†an t angular velocity ω=0.40 rad/s. Then modulus of the velocity v of the particle and the modulus of its total acceleration is:__________
Answer» A particle A moves along a corcle of radius R=50 cm so that its radius vector relative to an arbitrary point O on the circle rotates with cons†an t angular velocity ω=0.40 rad/s. Then modulus of the velocity v of the particle and the modulus of its total acceleration is:__________

Discussion

2646.	The force required to just move a body up an inclined plane is double the force required to just prevent it from sliding down. If θ is the angle of friction and ϕ is the angle which the plane makes with horizontal, then:
Answer» The force required to just move a body up an inclined plane is double the force required to just prevent it from sliding down. If $θ$ is the angle of friction and $ϕ$ is the angle which the plane makes with horizontal, then:

Discussion

2647.	Question 56.It can be inferred from the passage that the matching process in visual recognition is-
Answer» Question 56.It can be inferred from the passage that the matching process in visual recognition is-

Discussion

2648.	15.If the position of the aprticle varies as x=kt cube,then the velocity versus time graph is(k is constant)?
Answer» 15.If the position of the aprticle varies as x=kt cube,then the velocity versus time graph is(k is constant)?

Discussion

2649.	When the charge of 3 C is placed in a uniform electric field, it experiences a force of 3000 N within the influence of this field, potential difference (in volt) between two points separated by a distance of 1 cm is (Give your answer in integer value)
Answer» When the charge of $3 C$ is placed in a uniform electric field, it experiences a force of $3000 N$ within the influence of this field, potential difference (in volt) between two points separated by a distance of $1 cm$ is (Give your answer in integer value)

Discussion

2650.	A particle of mass o.5 Kg tied to a string in a vertical circular motion has been given speed 5m/s at the bottom point ,the length of the string is 1 m find the speed of the particle and T1) when string makes 60° from vertical 2) when string is 30° above point B ( point B is at 90° from bottom point)
Answer» A particle of mass o.5 Kg tied to a string in a vertical circular motion has been given speed 5m/s at the bottom point ,the length of the string is 1 m find the speed of the particle and T 1) when string makes 60° from vertical 2) when string is 30° above point B ( point B is at 90° from bottom point)

Discussion

Explore topic-wise InterviewSolutions in .

If the Value of resistance is 10.845ohm and the value of current is 3.23 Amp, the value of potential with significant numbers would be

15.Three particle of masses m1-1.2kg, m2-2.5kg, m3-3.4kg form an equilateral triangle of edge length a=140cm. what is the centre of mass of three particles?

25. A block of mass M moving with speed u collides elastically with block B of mass m which is connected to block C of mass m with a spring. When the compression in spring is maximum, the velocity of block C with respect to block A is. Neglect friction.

Given electrode potentials:Fe^3++e^------->Fe^2+E^°=0.771VI2+2e^------>2I^-E^°=0.536VE^°2Fe^3++2I^--------->2Fe^2-+I2Standard Electrode potential

18.A ball is thrown vertically upwards with certain initial velocity. Assume that there is no air resistance. Draw the following graph- Kinetic energy V/S Time

If coefficient of friction between all surfaces is 0.4, then find the minimum force F required to just keep the system from moving. [Take g=10 m/s2]

The position of a particle moving along the x-axis is expressed as x=at3+bt2+ct+d. The initial acceleration of the particle is

What do you mean by optically denser and optically rarer mediums?

A particle of mass m moving in the x− direction with speed 2v is hit by another particle of mass 2m moving in the y− direction with speed v. If the collision is perfectly inelastic, the percentage loss in energy during the collision is close to

A level was set up at point 'C' at a distance of 100m from 'A' and 1000 m from 'B'. The staff reading on the staff kept at A was 0.445 m and that on the staff held at B was 2.845m. The true difference in elevations (in m, correct upto three decimal places) of A and B is _________2.3334

When is a body said to have uniform velocity?

In the diagram shown below, all the three rods are of equal length L and same mass M. The system is rotated such that the rod B is the axis. What is the moment of inertia of the system?

Point charges q, q, -2q are placed at the corners of an equilateral triangle ABC of side l. The magnitude of net electric dipole moment of the system is

A 95 kg halfback (HB) makes a turn on the foot ball field. The half back sweeps out a path that is a portion of a circle with a radius of 12 m The halfback makes a quarter turn on a circular path in 2.1 seconds. The net force acting on the half back will be:

An isothermal surface is taken on an xy plane. Find the direction along which there will be largest change in temperature.

127.A uniform wire of 8 meter long and of resistence 5 ohm per metre is bent into the form of a square ABCD. The adjacent corners A and B are connected to a battery of e.m.f 2 volt and internal resistence. 5 ohm .Find the current along AB??

an object of mass m moves with cons†an t speed in a circular path of radius R under an action of a force of cons†an t magnitude F . the kinetic energy of obect is.

Axis of a hollow cone shown in figure is vertical. It’s base radius is ‘R’. It is kept in a uniform electric field E parallel to its axis.The magnitude of flux through curved part of the cone?

37.Write dimensional unit of mass using the formula f=ma

If f(1)=1,f′(1)=3, then the derivative of f(f(x))+(f(f(x)))2+f(x) w.r.t. x at x=1 is

in the graph of kinetic energy and velocity, we get a a curve line but the is m constant?

the length of a string tied to two rigid support is 40cm maximum length of stationary wave produced on it is

Two inductors, each of inductance L are connected in parallel. One more inductor of inductance 5 mH is connected in series with this combination. Now, the effective inductance is 15 mH. The value of L is

The figure here shows four paths on a p-V diagrams along which as gas can be taken from state i to state f. Rank the paths according to - 1.the change ΔEint in the internal energy of the gas.

An ideal gas is taken through a cycle 1231 (see figure) and the efficiency of the cycle was found to be 25%. When the same gas goes through the cycle 1341, the efficiency is 10%. Find the efficiency of the cycle 12341.

In Young's double-slit experiment , the intensity of light at a point on the screen where the path difference is λ is K units. What is the intensity of light at a point where the path difference is λ/3; λ being the wavelength of light used?

ntMoment of inertia of uniform circular disc about a diameter is I .its moment of inertia about an axis perpendicular to its plame passing through a point on its rim ?n ntExplain in detail kindlyn

A uniform disc of mass m and radius R is cut from the right side of the larger disc of mass M and radius 2R and kept on the left side as shown in the figure (shaded portion). Find the COM of the system w.r.t the origin O.

Find out the Fnet on 5th charge particle placed at apex of square pyramid of charges ( all charges are q)Where one of the charge present at origin

a metal whose temp. coefficient of resistivity is 0.0005/degree celsius is heated from 100 degree to 1100 degree celesius. By what factor does the mobility of electron in the metal change due to this change in temperature

A ball of mass m is dropped from height h on a horizontal floor which collides with it with speed u. If coefficient of restitution in floor is e, then impulse imparted to ball by the floor on its second rebounce is(1) meu(2) meu (e + 1)(3) me^2u (e + 1)(4) me^2u (e-1)

A series LCR with R=20 Ω, L=1.5 H and C=5 μF is connected to a variable frequency 200 V AC supply. When the frequency of the supply is equal to the natural frequency of the circuit, the average power transferred to the circuit in one complete cycle is n×103 W. The value of n is

One Plano-convex and one plano-concave lens of same radius of curvature ′R′ but of different materials are joined side by side as shown in the figure. If the refractive index of the material of 1 is μ1 and that of 2 is μ2, then the focal length of the combination is :

If velocity of a particle is v(t)=(9−3t) m/s, the average speed and magnitude of average velocity of the particle in 4 sec respectively are

2. A force F=(2i+3j-5k)N acts at a point r1=(2i+4j+7k)m. The torque of the force aboit the point r2=(i+2j+3k)m is?

11) Some heat is supplied to an ideal monoatomic gas under constant pressure. The part of the heat which goes to increase its internal energy will bea) 2/3b) 3/5c) 2/7d) 5/7

the velocity time graph of a particle moving along a straight line is shown as in figure the rate of acceleration and deceleration is constant and it is equal to 5 M per second square. If the average velocity during the motion is 20 m per second, then

A bullet of mass m2 is fired from a gun of mass m1 with horizontal velocity v. A plane mirror is fixed to the gun facing towards the bullet. The velocity of the image of the bullet formed by the plane mirror with respect to the bullet is (Neglect the mass of mirror)

A particle A moves along a corcle of radius R=50 cm so that its radius vector relative to an arbitrary point O on the circle rotates with cons†an t angular velocity ω=0.40 rad/s. Then modulus of the velocity v of the particle and the modulus of its total acceleration is:__________

The force required to just move a body up an inclined plane is double the force required to just prevent it from sliding down. If θ is the angle of friction and ϕ is the angle which the plane makes with horizontal, then:

Question 56.It can be inferred from the passage that the matching process in visual recognition is-

15.If the position of the aprticle varies as x=kt cube,then the velocity versus time graph is(k is constant)?

When the charge of 3 C is placed in a uniform electric field, it experiences a force of 3000 N within the influence of this field, potential difference (in volt) between two points separated by a distance of 1 cm is (Give your answer in integer value)