50278 + Interview Questions in Physics

1.	ntTo decrease the range of an ammeter,its resistance need to be decreased,An ammeter has resistance R0 and range I.Which of the following resistance can be connected in series with it to decrese its range to I/nn nta)R0/nn ntb)R0/n-1n ntc)R0/n+1n ntd)None of thesen
Answer» ntTo decrease the range of an ammeter,its resistance need to be decreased,An ammeter has resistance R0 and range I.Which of the following resistance can be connected in series with it to decrese its range to I/nn nta)R0/nn ntb)R0/n-1n ntc)R0/n+1n ntd)None of thesen

Discussion

2.	Two identical thin bar magnets, each of length l and pole strength m are placed at right angles to each other with the north pole of one touching the south pole of the other. What is the resultant magnetic moment of the system?
Answer» Two identical thin bar magnets, each of length $l$ and pole strength $m$ are placed at right angles to each other with the north pole of one touching the south pole of the other. What is the resultant magnetic moment of the system?

Discussion

3.	10 moles of O2 gas are contained in a cylinder of 5 litre capacity. If the cylinder leakage into atmosphere (pressure is 1 atm and temperature is 40oC), then the work done by the gas will be
Answer» 10 moles of $O_{2}$ gas are contained in a cylinder of 5 litre capacity. If the cylinder leakage into atmosphere (pressure is 1 atm and temperature is $40^{o} C$ ), then the work done by the gas will be

Discussion

4.	The angle of projection when the range is equal to the distance through which the particle would have to fall in order to acquire a velocity equal to its velocity of projection. (1) 30^° (2) 75^° (3) 45^° (4) 60^°
Answer» The angle of projection when the range is equal to the distance through which the particle would have to fall in order to acquire a velocity equal to its velocity of projection. (1) 30^° (2) 75^° (3) 45^° (4) 60^°

Discussion

5.	If a is the length of the side of a cube, the distance between the body-centred atom and one corner atom in the cube will be
Answer» If a is the length of the side of a cube, the distance between the body-centred atom and one corner atom in the cube will be

Discussion

6.	A ring of mass ′m′ is rolling without slipping with velocity of centre of mass (v) as shown in figure. Four particles each of mass ′m′ are also attached at points A,B,C and D. Total kinetic energy of system is:
Answer» A ring of mass $^{'} m^{'}$ is rolling without slipping with velocity of centre of mass $(v)$ as shown in figure. Four particles each of mass $^{'} m^{'}$ are also attached at points $A, B, C$ and $D$ . Total kinetic energy of system is:

Discussion

7.	The displacement of a particle moving in a straight line is described by the relation x(in m) =6+12t−2t2. The distance covered by the particle in first 5 s is
Answer» The displacement of a particle moving in a straight line is described by the relation $x (in m) = 6 + 12 t - 2 t^{2}$ . The distance covered by the particle in first $5 s$ is

Discussion

8.	A Train is 50m Long moving 30km/h crosses a Bridge in 36seconds what is the Length of the bridge?
Answer» A Train is 50m Long moving 30km/h crosses a Bridge in 36seconds what is the Length of the bridge?

Discussion

9.	If r=5×10–4 m,ρ=103kg m–3,g=10 ms–2,T=0.11 Nm–1, the radius of the drop when it detaches from the dropper is approximately
Answer» If $r = 5 \times 10^{- 4} m, ρ = 10^{3} {kg m}^{- 3}, g = 10 {ms}^{- 2}, T = 0.11 {Nm}^{- 1}$ , the radius of the drop when it detaches from the dropper is approximately

Discussion

10.	Sliding considerations for stopped vehicles on super elevated horizontal curves provide the following bound on the amount of super elevation, e,
Answer» Sliding considerations for stopped vehicles on super elevated horizontal curves provide the following bound on the amount of super elevation, e,

Discussion

11.	A particle moves with deceleration along the circle of radius R so that at any moment of time its tangential and centripetal accelerations are equal in moduli. At the initial moment t=0, the speed of the particle equals v0. ThenThe total acceleration of the particle is
Answer» A particle moves with deceleration along the circle of radius $R$ so that at any moment of time its tangential and centripetal accelerations are equal in moduli. At the initial moment $t = 0$ , the speed of the particle equals $v_{0}$ . Then The total acceleration of the particle is

Discussion

12.	A device X is connected across an ac source of voltage V=V0sin ω T. The current through X is given as I=I0sin(ωt+π2) (a) Identify the device X and write the expression for its reactance. (b) Draw graphs showing variation of voltage and current with time over one cycle of ac, for X. (c) How does the reactance of the device X vary with freqency of the ac ? Show this variation graphically. (d) Draw the phasor diagram for the device X.
Answer» A device X is connected across an ac source of voltage $V = V_{0} s i n ω T .$ The current through X is given as $I = I_{0} s i n (ω t + \frac{π}{2})$ (a) Identify the device X and write the expression for its reactance. (b) Draw graphs showing variation of voltage and current with time over one cycle of ac, for X. (c) How does the reactance of the device X vary with freqency of the ac ? Show this variation graphically. (d) Draw the phasor diagram for the device X.

Discussion

13.	Two bodies are thrown up at angles of 45∘ and 60∘, respectively, with the horizontal. If both bodies attain same vertical height, then the ratio of velocities with which these are thrown is
Answer» Two bodies are thrown up at angles of $45^{\circ}$ and $60^{\circ}$ , respectively, with the horizontal. If both bodies attain same vertical height, then the ratio of velocities with which these are thrown is

Discussion

14.	{ †ext { The } x †ext { and } y †ext { coordinates of a particle at any time } t †ext { are given } } { †ext { by } x = 7 t + 4 t ^ { 2 } †ext { and } y = 5 t †ext { , where } x †ext { and } y †ext { are in metre and } } { t †ext { in seconds. The acceleration of particle at } t = 5 s †ext { is }
Answer» { †ext { The } x †ext { and } y †ext { coordinates of a particle at any time } t †ext { are given } } { †ext { by } x = 7 t + 4 t ^ { 2 } †ext { and } y = 5 t †ext { , where } x †ext { and } y †ext { are in metre and } } { t †ext { in seconds. The acceleration of particle at } t = 5 s †ext { is }

Discussion

15.	The unit of plane angle is radian, hence its dimensions are
Answer» The unit of plane angle is radian, hence its dimensions are

Discussion

16.	Consider the charges 3q,4q,6q placed at the vertices of an equilateral triangle, what is the force on each charge?
Answer» Consider the charges 3q,4q,6q placed at the vertices of an equilateral triangle, what is the force on each charge?

Discussion

17.	86. Assertion :When a dielectric slab is kept near an isolated parallel plate charged capacitor: it will pull the dielectric slab between the plates. Reason :Energy of system decreases when dielectric slab enters between plates of charged parallel plate capacitor.
Answer» 86. Assertion :When a dielectric slab is kept near an isolated parallel plate charged capacitor: it will pull the dielectric slab between the plates. Reason :Energy of system decreases when dielectric slab enters between plates of charged parallel plate capacitor.

Discussion

18.	A and B are two metallic pieces. They are fully immersed in water and then weighed. Now they show same loss of weight. The conclusion therefore is:
Answer» A and B are two metallic pieces. They are fully immersed in water and then weighed. Now they show same loss of weight. The conclusion therefore is:

Discussion

19.	de-Broglie wavelength of a body of mass 1 kg moving with velocity of 2000 m/s is
Answer» de-Broglie wavelength of a body of mass 1 kg moving with velocity of 2000 m/s is

Discussion

20.	A geostationary satellite orbits around the earth in a circular orbit of radius 36,000 km. Then, the time period of a spy satellite orbiting a few hundred km above the earth's surface (Re = 6400 km) will approximately be
Answer» A geostationary satellite orbits around the earth in a circular orbit of radius 36,000 km. Then, the time period of a spy satellite orbiting a few hundred km above the earth's surface ( $R_{e}$ = 6400 km) will approximately be

Discussion

21.	From the top of a tower a particle is thrown down with velocity 10m/s. Find ratio of distances travelled by it in third and second second
Answer» From the top of a tower a particle is thrown down with velocity 10m/s. Find ratio of distances travelled by it in third and second second

Discussion

22.	Figure 10.24 (a) shows a thin liquid film supporting a small weight = 4.5 × 10¯² N. What is the weight supported by a film of the same liquid at the same temperature in Fig. (b) and (c) ? Explain your answer physically
Answer» Figure 10.24 (a) shows a thin liquid film supporting a small weight = 4.5 × 10¯² N. What is the weight supported by a film of the same liquid at the same temperature in Fig. (b) and (c) ? Explain your answer physically

Discussion

23.	16.A wall has 2 layers A and B, each made of different material. Both the layers have the same thickness. The thermal conductivity for A is twice that of British and, under steady condition, the temperature difference across the wall is 36 degree Celsius. The temperature difference across the layer A is.
Answer» 16.A wall has 2 layers A and B, each made of different material. Both the layers have the same thickness. The thermal conductivity for A is twice that of British and, under steady condition, the temperature difference across the wall is 36 degree Celsius. The temperature difference across the layer A is.

Discussion

24.	A wave pulse starts propagating in the x-direction along a non-uniform wire of length 20 m with mass per unit length given by μ=μ0+ax and under a tension of 400 N. Find the time taken(in seconds) by the pulse to travel from the lighter end (x=0) to the heavier end. μ0=10−2 kg/m and a=16×10−3 kg/m2.
Answer» A wave pulse starts propagating in the x-direction along a non-uniform wire of length $20 m$ with mass per unit length given by $μ = μ_{0} + a x$ and under a tension of $400 N$ . Find the time taken(in seconds) by the pulse to travel from the lighter end $(x = 0)$ to the heavier end. $μ_{0} = 10^{- 2} kg/m$ and $a = 16 \times 10^{- 3} {kg/m}^{2}$ .

Discussion

25.	Plates of area A are arranged as shown. The distance between each two plates is d, the net capacitance between ‘a’ and ‘b’ is:
Answer» Plates of area A are arranged as shown. The distance between each two plates is d, the net capacitance between ‘a’ and ‘b’ is:

Discussion

26.	if we apply two forces of 20n and 12n across two ends of a rod of cross section A , will the stress be 12/A ?
Answer» if we apply two forces of 20n and 12n across two ends of a rod of cross section A , will the stress be 12/A ?

Discussion

27.	if the area of contact surface is doubled keeping mass constant then the normal contact force
Answer» if the area of contact surface is doubled keeping mass constant then the normal contact force

Discussion

28.	If the following input signal is sent through a PN-junction diode, then the output signal across RL will be
Answer» If the following input signal is sent through a PN-junction diode, then the output signal across R_L will be

Discussion

29.	Two gases A and B having same pressure P, volume V and temperature T are mixed. If the mixture has volume and temperature as V and T respectively, then the pressure of the mixture will be
Answer» Two gases $A$ and $B$ having same pressure $P$ , volume $V$ and temperature $T$ are mixed. If the mixture has volume and temperature as $V$ and $T$ respectively, then the pressure of the mixture will be

Discussion

30.	27.Find the work done of system if 100 ltrs gas is compressed to 10 ltrs
Answer» 27.Find the work done of system if 100 ltrs gas is compressed to 10 ltrs

Discussion

31.	A car moves at constant speed of 60km/hr for 1km and 40km/hr for next 1km. What is the average speed of the car?
Answer» A car moves at constant speed of 60km/hr for 1km and 40km/hr for next 1km. What is the average speed of the car?

Discussion

32.	The local maximum value of the function f(x)=(2x)x2, x>0, is
Answer» The local maximum value of the function $f (x) = {(\frac{2}{x})}^{x^{2}}, x > 0,$ is

Discussion

33.	Two blocks of same mass m are connected to each other by spring of spring constant k. Initially spring is compressed by x0 and blocks are connected by string. Whole system is placed on a smooth horizontal table. Now both blocks are given same horizontal velocity v perpendicular to spring and string is cut simultaneously. During subsequent motion of blocks. Find the speed of blocks when extension in spring is maximum
Answer» Two blocks of same mass m are connected to each other by spring of spring constant k. Initially spring is compressed by $x_{0}$ and blocks are connected by string. Whole system is placed on a smooth horizontal table. Now both blocks are given same horizontal velocity v perpendicular to spring and string is cut simultaneously. During subsequent motion of blocks. Find the speed of blocks when extension in spring is maximum

33.

Two blocks of same mass m are connected to each other by spring of spring constant k. Initially spring is compressed by x0 and blocks are connected by string. Whole system is placed on a smooth horizontal table. Now both blocks are given same horizontal velocity v perpendicular to spring and string is cut simultaneously. During subsequent motion of blocks. Find the speed of blocks when extension in spring is maximum

Answer»

Two blocks of same mass m are connected to each other by spring of spring constant k. Initially spring is compressed by $x_{0}$ and blocks are connected by string. Whole system is placed on a smooth horizontal table. Now both blocks are given same horizontal velocity v perpendicular to spring and string is cut simultaneously. During subsequent motion of blocks.

Find the speed of blocks when extension in spring is maximum

Discussion

34.	The escape velocity from the earth surface is V. The velocity of a satellite while orbiting just above the earth's surface is v.Then the relation between these velocities is
Answer» The escape velocity from the earth surface is V. The velocity of a satellite while orbiting just above the earth's surface is v.Then the relation between these velocities is

Discussion

35.	Assume a person standing on the surface of Moon witnessing an explosion from a long distance. Will he able to hear the explosion?
Answer» Assume a person standing on the surface of Moon witnessing an explosion from a long distance. Will he able to hear the explosion?

Discussion

36.	In the density measurement of a cube, the mass and edge length are measured as 10.00±0.10 kg and (0.10±0.01) m, respectively. The error in the measurement of density is
Answer» In the density measurement of a cube, the mass and edge length are measured as $10.00 \pm 0.10 kg and (0.10 \pm 0.01) m$ , respectively. The error in the measurement of density is

Discussion

37.	In the arrangement shown in figure. There is a fricion force between the block of masses m and 2m. Block of mass 2m is kept on a smooth horizontal plane. The mass of suspended block is m. Block A is stationary with respect to block of mass 2m. The minimum value of coefficient of fricion betwen A and B is
Answer» In the arrangement shown in figure. There is a fricion force between the block of masses $m$ and $2 m$ . Block of mass $2 m$ is kept on a smooth horizontal plane. The mass of suspended block is $m$ . Block $A$ is stationary with respect to block of mass $2 m$ . The minimum value of coefficient of fricion betwen $A$ and $B$ is

Discussion

38.	A particle is thrown vertically upwards. It's velocity at half of the height is 10 m/s, then the maximum height attained by it will be:
Answer» A particle is thrown vertically upwards. It's velocity at half of the height is $10 m/s$ , then the maximum height attained by it will be:

Discussion

39.	A balloon is rising vertically up with a velocity of 29 metre per second. a stone is dropped from a height it and it reaches the ground in 10 seconds . the height of the balloon when the stone was dropped from it is
Answer» A balloon is rising vertically up with a velocity of 29 metre per second. a stone is dropped from a height it and it reaches the ground in 10 seconds . the height of the balloon when the stone was dropped from it is

Discussion

40.	35.a man rides a cycle up the hill whose slope is 1 in 20.if the combined masses of man and cycle is 150kg and the man covers a distance of 100m along the incline.calculate the work done by the man .Neglect the effect of friction between tyres of cycle and land surface of hill.
Answer» 35.a man rides a cycle up the hill whose slope is 1 in 20.if the combined masses of man and cycle is 150kg and the man covers a distance of 100m along the incline.calculate the work done by the man .Neglect the effect of friction between tyres of cycle and land surface of hill.

Discussion

41.	If the potential difference between the plates of a charged and isolated parallel-plate condenser of capacitance 1 μF changes from 12 V to 4 V when a dielectric slab of dielectric constant K is introduced to fill the entire space between the plates, then
Answer» If the potential difference between the plates of a charged and isolated parallel-plate condenser of capacitance 1 μF changes from 12 V to 4 V when a dielectric slab of dielectric constant K is introduced to fill the entire space between the plates, then

Discussion

42.	Two particles of masses 1 kg and 2 kg are located at x=0 and x=3 m. The position of their centre of mass is given by the co-ordinates
Answer» Two particles of masses $1 kg$ and $2 kg$ are located at $x = 0$ and $x = 3 m$ . The position of their centre of mass is given by the co-ordinates

Discussion

43.	A particle of mass m and charge q is fastened to one end of a string of length l. The other end of the string is fixed to the point O. The whole system lies on a frictionless horizontal plane. Initially, the mass is at rest at A. A uniform electric field in the direction shown is then switched on. The speed of the particle when it reaches B is -
Answer» A particle of mass $m$ and charge $q$ is fastened to one end of a string of length $l$ . The other end of the string is fixed to the point $O$ . The whole system lies on a frictionless horizontal plane. Initially, the mass is at rest at $A$ . A uniform electric field in the direction shown is then switched on. The speed of the particle when it reaches $B$ is -

Discussion

44.	A microwave oven rotates with angular speed 2ω and initial frequency fi. If angular speed decreases to ω, final frequency ff of the rotor is
Answer» A microwave oven rotates with angular speed $2 ω$ and initial frequency $f_{i}$ . If angular speed decreases to $ω$ , final frequency $f_{f}$ of the rotor is

Discussion

45.	A ball of mass 4 kg is moving in 3 dimensional plane and the velocity of ball w.r.t an observer is →V1=−3^i+4^j+5^k and the velocity of observer w.r.t ground is given as →V2=2^i+2^j−4^k. Find out kinetic energy of ball w.r.t ground.
Answer» A ball of mass $4 kg$ is moving in $3$ dimensional plane and the velocity of ball w.r.t an observer is ${\to V}_{1} = - 3^i + 4^j + 5^k$ and the velocity of observer w.r.t ground is given as ${\to V}_{2} = 2^i + 2^j - 4^k$ . Find out kinetic energy of ball w.r.t ground.

Discussion

46.	A ball is thrown from a point on a ground at some angle of projection. At the same time, a bird starts from a point directly above this point of projection at a height h, horizontally with speed ′u′. Given that during its flight, the ball just touches the bird at only one point. Find the distance on the ground from the point of projection where the ball strikes.
Answer» A ball is thrown from a point on a ground at some angle of projection. At the same time, a bird starts from a point directly above this point of projection at a height $h$ , horizontally with speed $^{'} u^{'}$ . Given that during its flight, the ball just touches the bird at only one point. Find the distance on the ground from the point of projection where the ball strikes.

Discussion

47.	Solve the previous problem if the pulley has a moment of inertial I about its axis and the string does not slip over it.
Answer» Solve the previous problem if the pulley has a moment of inertial I about its axis and the string does not slip over it.

Discussion

48.	An object of mass 2 kg is moved from infinity to a point P. Initially the object was at rest but on reaching P its speed becomes 2 m/s. If the work done in moving that object is −4 J, then find the ratio of potential energy to mass at point P (in J/kg) is
Answer» An object of mass $2 kg$ is moved from infinity to a point $P$ . Initially the object was at rest but on reaching $P$ its speed becomes $2 m/s$ . If the work done in moving that object is $- 4 J$ , then find the ratio of potential energy to mass at point $P$ (in $J/kg$ ) is

Discussion

49.	The oscillation frequency of a cyclotron is 10 MHz. What should be the operating magnetic field for accelerating proton?
Answer» The oscillation frequency of a cyclotron is $10 MHz$ . What should be the operating magnetic field for accelerating proton?

Discussion

50.	A wave travels along the positive x-direction with a speed of 20 ms−1. The amplitude of the wave is 0.20 cm and the wavelength 2.0 cm. (a) Write a suitable wave equation which describes this wave. (b) What is the displacement and velocity of the particle at x = 2.0 cm at time t = 0 according to the wave equation written ? Can you get different values of this quantity if the wave equation is written in a different fashion ?
Answer» A wave travels along the positive x-direction with a speed of $20 m s^{- 1}$ . The amplitude of the wave is 0.20 cm and the wavelength 2.0 cm. (a) Write a suitable wave equation which describes this wave. (b) What is the displacement and velocity of the particle at x = 2.0 cm at time t = 0 according to the wave equation written ? Can you get different values of this quantity if the wave equation is written in a different fashion ?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

ntTo decrease the range of an ammeter,its resistance need to be decreased,An ammeter has resistance R0 and range I.Which of the following resistance can be connected in series with it to decrese its range to I/nn nta)R0/nn ntb)R0/n-1n ntc)R0/n+1n ntd)None of thesen

Two identical thin bar magnets, each of length l and pole strength m are placed at right angles to each other with the north pole of one touching the south pole of the other. What is the resultant magnetic moment of the system?

10 moles of O2 gas are contained in a cylinder of 5 litre capacity. If the cylinder leakage into atmosphere (pressure is 1 atm and temperature is 40oC), then the work done by the gas will be

The angle of projection when the range is equal to the distance through which the particle would have to fall in order to acquire a velocity equal to its velocity of projection. (1) 30^° (2) 75^° (3) 45^° (4) 60^°

If a is the length of the side of a cube, the distance between the body-centred atom and one corner atom in the cube will be

A ring of mass ′m′ is rolling without slipping with velocity of centre of mass (v) as shown in figure. Four particles each of mass ′m′ are also attached at points A,B,C and D. Total kinetic energy of system is:

The displacement of a particle moving in a straight line is described by the relation x(in m) =6+12t−2t2. The distance covered by the particle in first 5 s is

A Train is 50m Long moving 30km/h crosses a Bridge in 36seconds what is the Length of the bridge?

If r=5×10–4 m,ρ=103kg m–3,g=10 ms–2,T=0.11 Nm–1, the radius of the drop when it detaches from the dropper is approximately

Sliding considerations for stopped vehicles on super elevated horizontal curves provide the following bound on the amount of super elevation, e,

A particle moves with deceleration along the circle of radius R so that at any moment of time its tangential and centripetal accelerations are equal in moduli. At the initial moment t=0, the speed of the particle equals v0. ThenThe total acceleration of the particle is

Two bodies are thrown up at angles of 45∘ and 60∘, respectively, with the horizontal. If both bodies attain same vertical height, then the ratio of velocities with which these are thrown is

The unit of plane angle is radian, hence its dimensions are

Consider the charges 3q,4q,6q placed at the vertices of an equilateral triangle, what is the force on each charge?

86. Assertion :When a dielectric slab is kept near an isolated parallel plate charged capacitor: it will pull the dielectric slab between the plates. Reason :Energy of system decreases when dielectric slab enters between plates of charged parallel plate capacitor.

A and B are two metallic pieces. They are fully immersed in water and then weighed. Now they show same loss of weight. The conclusion therefore is:

de-Broglie wavelength of a body of mass 1 kg moving with velocity of 2000 m/s is

A geostationary satellite orbits around the earth in a circular orbit of radius 36,000 km. Then, the time period of a spy satellite orbiting a few hundred km above the earth's surface (Re = 6400 km) will approximately be

From the top of a tower a particle is thrown down with velocity 10m/s. Find ratio of distances travelled by it in third and second second

Figure 10.24 (a) shows a thin liquid film supporting a small weight = 4.5 × 10¯² N. What is the weight supported by a film of the same liquid at the same temperature in Fig. (b) and (c) ? Explain your answer physically

Plates of area A are arranged as shown. The distance between each two plates is d, the net capacitance between ‘a’ and ‘b’ is:

if we apply two forces of 20n and 12n across two ends of a rod of cross section A , will the stress be 12/A ?

if the area of contact surface is doubled keeping mass constant then the normal contact force

If the following input signal is sent through a PN-junction diode, then the output signal across RL will be

Two gases A and B having same pressure P, volume V and temperature T are mixed. If the mixture has volume and temperature as V and T respectively, then the pressure of the mixture will be

27.Find the work done of system if 100 ltrs gas is compressed to 10 ltrs

​​​​​​A car moves at constant speed of 60km/hr for 1km and 40km/hr for next 1km. What is the average speed of the car?

The local maximum value of the function f(x)=(2x)x2, x&gt;0, is

The escape velocity from the earth surface is V. The velocity of a satellite while orbiting just above the earth's surface is v.Then the relation between these velocities is

Assume a person standing on the surface of Moon witnessing an explosion from a long distance. Will he able to hear the explosion?

In the density measurement of a cube, the mass and edge length are measured as 10.00±0.10 kg and (0.10±0.01) m, respectively. The error in the measurement of density is

A particle is thrown vertically upwards. It's velocity at half of the height is 10 m/s, then the maximum height attained by it will be:

A balloon is rising vertically up with a velocity of 29 metre per second. a stone is dropped from a height it and it reaches the ground in 10 seconds . the height of the balloon when the stone was dropped from it is

35.a man rides a cycle up the hill whose slope is 1 in 20.if the combined masses of man and cycle is 150kg and the man covers a distance of 100m along the incline.calculate the work done by the man .Neglect the effect of friction between tyres of cycle and land surface of hill.

If the potential difference between the plates of a charged and isolated parallel-plate condenser of capacitance 1 μF changes from 12 V to 4 V when a dielectric slab of dielectric constant K is introduced to fill the entire space between the plates, then

Two particles of masses 1 kg and 2 kg are located at x=0 and x=3 m. The position of their centre of mass is given by the co-ordinates

A microwave oven rotates with angular speed 2ω and initial frequency fi. If angular speed decreases to ω, final frequency ff of the rotor is

A ball of mass 4 kg is moving in 3 dimensional plane and the velocity of ball w.r.t an observer is →V1=−3^i+4^j+5^k and the velocity of observer w.r.t ground is given as →V2=2^i+2^j−4^k. Find out kinetic energy of ball w.r.t ground.

Solve the previous problem if the pulley has a moment of inertial I about its axis and the string does not slip over it.

An object of mass 2 kg is moved from infinity to a point P. Initially the object was at rest but on reaching P its speed becomes 2 m/s. If the work done in moving that object is −4 J, then find the ratio of potential energy to mass at point P (in J/kg) is

The oscillation frequency of a cyclotron is 10 MHz. What should be the operating magnetic field for accelerating proton?

A car moves at constant speed of 60km/hr for 1km and 40km/hr for next 1km. What is the average speed of the car?

The local maximum value of the function f(x)=(2x)x2, x>0, is