50278 + Interview Questions in Physics

1.	Lenz’s law is a consequence of the law of conservations of :
Answer» Lenz’s law is a consequence of the law of conservations of :

Discussion

2.	A hole is made at the bottom of the tank filled with water (density 1000 kg/m3). If the total pressure at the bottom of the tank is 3 atmosphere (1 atmosphere = 105 N/m2), then the velocity of efflux is
Answer» A hole is made at the bottom of the tank filled with water (density $1000 {kg/m}^{3}$ ). If the total pressure at the bottom of the tank is 3 atmosphere (1 atmosphere = $10^{5} {N/m}^{2}$ ), then the velocity of efflux is

Discussion

3.	The resultant of two forces, one double the other in magnitude, is perpendicular to the smaller of the two forces. The angle between the two forces is
Answer» The resultant of two forces, one double the other in magnitude, is perpendicular to the smaller of the two forces. The angle between the two forces is

Discussion

4.	An ideal solenoid of cross-sectional area 10−4 m2 has 500 turns per meter. At the centre of this solenoid, another coil of 100 turns is wrapped closely around it. If the current in the coil changes from 0 A to 2 A in 3.14 ms. The emf developed in the solenoid is
Answer» An ideal solenoid of cross-sectional area $10^{- 4} m^{2}$ has $500$ turns per meter. At the centre of this solenoid, another coil of $100$ turns is wrapped closely around it. If the current in the coil changes from $0 A$ to $2 A$ in $3.14 ms .$ The emf developed in the solenoid is

Discussion

5.	Explain path variable in detail with example.
Answer» Explain path variable in detail with example.

Discussion

6.	A rectangular sheet of tin 45 cm by 24 cm is to be made into a box without top, by cutting-off square from each corner and folding up the flaps. What should be the side of the square to be cut-off so that the volume of the box is maximum?
Answer» A rectangular sheet of tin 45 cm by 24 cm is to be made into a box without top, by cutting-off square from each corner and folding up the flaps. What should be the side of the square to be cut-off so that the volume of the box is maximum?

Discussion

7.	Four charges are placed at the circumference of a dial clock as shown in the figure. If the clock has only hour hand, then the resultant force on a charge +q0 placed at the centre, points in the direction which shows the time as
Answer» Four charges are placed at the circumference of a dial clock as shown in the figure. If the clock has only hour hand, then the resultant force on a charge $+ q_{0}$ placed at the centre, points in the direction which shows the time as

Discussion

8.	Water is flowing through a horizontal tube of non - uniform cross - section. At a place the radius of the tube is 1.0 cm and the velocity of water is 2 m/s. Then, what will be the velocity of water at a point where the radius of the pipe is 2.0 cm?
Answer» Water is flowing through a horizontal tube of non - uniform cross - section. At a place the radius of the tube is $1.0 cm$ and the velocity of water is $2 m/s$ . Then, what will be the velocity of water at a point where the radius of the pipe is $2.0 cm$ ?

Discussion

9.	A thin brass rectangular sheet of sides 15.0 cm and 12.0 cm is heated in a furnace to 527∘C and taken out. Find the electric power needed to maintain the sheet at this temperature, given that its emissivity is 0.250 (Neglect heat loss due to convection and σ=5.67×10−8 W/m2− K4)
Answer» A thin brass rectangular sheet of sides $15.0 cm$ and $12.0 cm$ is heated in a furnace to $527^{\circ} C$ and taken out. Find the electric power needed to maintain the sheet at this temperature, given that its emissivity is $0.250$ (Neglect heat loss due to convection and $σ = 5.67 \times 10^{- 8} {W/m}^{2} - K^{4}$ )

Discussion

10.

A satellite is in a circular equatorial orbit of radius 7000 km around the earth. If it is transferred to a circular orbit of double the radius. Column I Column -II(A) angular momentum(P) increases(B) area of earth covered by satellite signal(Q) decreases(C) potential energy(R) becomes double(D) kinetic energy(S) becomes halfWhich of the following option has the correct combination considering column-I and column-II.

Answer»

A satellite is in a circular equatorial orbit of radius $7000 km$ around the earth. If it is transferred to a circular orbit of double the radius.

Column I	Column -II
(A) angular momentum	(P) increases
(B) area of earth covered by satellite signal	(Q) decreases
(C) potential energy	(R) becomes double
(D) kinetic energy	(S) becomes half

Which of the following option has the correct combination considering column-I and column-II.

Discussion

11.	Explain how the various energy conversions that happen to take the energy from coal to you reading this question on your electronic device.
Answer» Explain how the various energy conversions that happen to take the energy from coal to you reading this question on your electronic device.

Discussion

12.	2. In a Vernier Calliper length of 10 main scale division is 2 mm 20 vernier scale division coincide with 10 main scale division then the least count of instrument is
Answer» 2. In a Vernier Calliper length of 10 main scale division is 2 mm 20 vernier scale division coincide with 10 main scale division then the least count of instrument is

Discussion

13.	A boy uses a vernier callipers to measure the thickness of his pencil. He measures it to be 1.40 mm. If the zero error of vernier callipers is +0.02 cm, what is the correct thickness of the pencil?
Answer» A boy uses a vernier callipers to measure the thickness of his pencil. He measures it to be $1.40 mm$ . If the zero error of vernier callipers is $+ 0.02 cm$ , what is the correct thickness of the pencil?

Discussion

14.	Two circular coils A and B are placed closed to each other. If the current in the coil A is changed, will some current be induced in coil B? Give reason
Answer» Two circular coils A and B are placed closed to each other. If the current in the coil A is changed, will some current be induced in coil B? Give reason

Discussion

15.	energy of h2 atom in ground state is -13.6eV energy of he2+ ion in second excited state is nearly
Answer» energy of h2 atom in ground state is -13.6eV energy of he2+ ion in second excited state is nearly

Discussion

16.	A body of mass m is projected horizontally with a velocity v from the top of a tower of height h and it reaches the ground at a distance x from the foot of the tower. If a second body of mass 2m is projected horizontally from the top of a tower of height 2h, it reaches the ground at a distance 2x from the foot of the tower. The horizontal velocity of the second body is
Answer» A body of mass $m$ is projected horizontally with a velocity $v$ from the top of a tower of height $h$ and it reaches the ground at a distance $x$ from the foot of the tower. If a second body of mass $2 m$ is projected horizontally from the top of a tower of height $2 h$ , it reaches the ground at a distance $2 x$ from the foot of the tower. The horizontal velocity of the second body is

Discussion

17.	In an adjoining figure are shown three capacitors C1,C2 and C3 joined to a battery. The correct condition will be (Symbols have their usual meanings)
Answer» In an adjoining figure are shown three capacitors C₁,C₂ and C₃ joined to a battery. The correct condition will be (Symbols have their usual meanings)

17.

In an adjoining figure are shown three capacitors C1,C2 and C3 joined to a battery. The correct condition will be (Symbols have their usual meanings)

Answer»

In an adjoining figure are shown three capacitors C₁,C₂ and C₃ joined to a

battery. The correct condition will be (Symbols have their usual meanings)

Discussion

18.	how power could be same in output and input because if current is changing
Answer» how power could be same in output and input because if current is changing

Discussion

19.	A sensor is exposed for time t to a lamp of power P at distance l. The sensor has an opening that is 4d in diameter. Assuming all of the energy is given off as light, the number of photons entering the sensor if the wavelength of the light is λ is
Answer» A sensor is exposed for time $t$ to a lamp of power $P$ at distance $l$ . The sensor has an opening that is 4 $d$ in diameter. Assuming all of the energy is given off as light, the number of photons entering the sensor if the wavelength of the light is $λ$ is

Discussion

20.	A charged wire of length 3 m lies along x− axis in such a way that its linear charge density is given by λ=2x2 C/m. The total charge on the wire is
Answer» A charged wire of length $3 m$ lies along $x -$ axis in such a way that its linear charge density is given by $λ = 2 x^{2} C/m$ . The total charge on the wire is

Discussion

21.	If two plane mjrrmir are inclined at angle of 90 then the incident ray and the final reflected ray are parallel or antiparallel? Since interior angles are 180
Answer» If two plane mjrrmir are inclined at angle of 90 then the incident ray and the final reflected ray are parallel or antiparallel? Since interior angles are 180

Discussion

22.	At absolute zero temperature, pressure of a gas will be
Answer» At absolute zero temperature, pressure of a gas will be

Discussion

23.	The mid-span deflection simply supported beam AB with loading as shown in figure is given by
Answer» The mid-span deflection simply supported beam $A B$ with loading as shown in figure is given by

Discussion

24.	In the arrangement shown in the figure, the mass of wedge A and that of the block B are 3 m and m respectively. Friction exists between A and B only. The mass of the block C is m. The force F=19.5 mg is applied on the block C as shown in the figure. The minimum coefficient of friction (μ) between A and B so that B remains stationary with respect to wedge A will be 1x then, find the value of x
Answer» In the arrangement shown in the figure, the mass of wedge $A$ and that of the block $B$ are $3 m$ and $m$ respectively. Friction exists between $A$ and $B$ only. The mass of the block $C$ is $m$ . The force $F = 19.5 m g$ is applied on the block $C$ as shown in the figure. The minimum coefficient of friction $(μ)$ between $A$ and $B$ so that $B$ remains stationary with respect to wedge $A$ will be $\frac{1}{x}$ then, find the value of $x$

Discussion

25.	Two towers AB and CD are situated at a distance d apart. An object of mass m is thrown from the top of AB horizontally with a velocity of 10 m/s towards CD. Simultaneously another object of mass 2 m is thrown from the top of CD at an angle 60∘ with the horizontal towards AB with the same magnitude of initial velocity as that of the first object. The two objects move in the same vertical plane, collide in mid-air and stick with each other. Find the distance between the foot of the towers (approximately).
Answer» Two towers AB and CD are situated at a distance $d$ apart. An object of mass $m$ is thrown from the top of AB horizontally with a velocity of $10 m / s$ towards CD. Simultaneously another object of mass $2 m$ is thrown from the top of CD at an angle $60^{\circ}$ with the horizontal towards AB with the same magnitude of initial velocity as that of the first object. The two objects move in the same vertical plane, collide in mid-air and stick with each other. Find the distance between the foot of the towers (approximately).

Discussion

26.	13.A charge q is distributed uniformly on a ring of radius r . A sphere of equal radius r is centered at a circumference of ring .find the flux of the electric field through surface of sphere
Answer» 13.A charge q is distributed uniformly on a ring of radius r . A sphere of equal radius r is centered at a circumference of ring .find the flux of the electric field through surface of sphere

Discussion

27.	23. Velocity-time graph of two bodies A and B starting from the same position and moving in a straight line is shown in the picture. Which of the given options are true?
Answer» 23. Velocity-time graph of two bodies A and B starting from the same position and moving in a straight line is shown in the picture. Which of the given options are true?

Discussion

28.	The volume occupied by 4.75 g of acetylene gas at 50C and 750 mm Hg pressure is \text{L}\).(Round off to the nearest integer)(Given, R=0.0826 L atm K−1 mol−1).
Answer» The volume occupied by $4.75 g$ of acetylene gas at $50^{C}$ and $750 mm Hg$ pressure is \text{L}\). (Round off to the nearest integer) (Given, $R = 0.0826 {L atm K}^{- 1} {mol}^{- 1}$ ).

Discussion

29.	A hollow metal sphere of radius 10 cm is charged such that the potential on its surface is 80 volt. The potential at the centre of the sphere is
Answer» A hollow metal sphere of radius 10 cm is charged such that the potential on its surface is 80 volt. The potential at the centre of the sphere is

Discussion

30.	A boy is standing on a ground which is accelerating vertically upwards with constant acceleration. If boy throws a ball vertically up with velocity v0 relative to plank and it's time of flight is T, the acceleration of the plank is
Answer» A boy is standing on a ground which is accelerating vertically upwards with constant acceleration. If boy throws a ball vertically up with velocity v0 relative to plank and it's time of flight is T, the acceleration of the plank is

Discussion

31.	The amount of steel required such that there is not flexure collapse given combination of loads is equal to ___ mm2. Mu=80kNm;Tu=40kNm;Vu=60kNThe dimension of the beam are 300 mm x 500 mm and effective cover = 40 mm Take M25 concrete and Fe415 steel.974
Answer» The amount of steel required such that there is not flexure collapse given combination of loads is equal to ___ $m m^{2}$ . $M_{u} = 80 k N m; T_{u} = 40 k N m; V_{u} = 60 k N$ The dimension of the beam are 300 mm x 500 mm and effective cover = 40 mm Take M25 concrete and Fe415 steel. 974

Discussion

32.	A pebble is thrown horizontally from a top of a 20m high tower woth an initial velocity 10m/s. The air drag is negligible. The speed of the pebble when it is at the same distance from the top and base of the tower.(g=10m/s
Answer» A pebble is thrown horizontally from a top of a 20m high tower woth an initial velocity 10m/s. The air drag is negligible. The speed of the pebble when it is at the same distance from the top and base of the tower.(g=10m/s

Discussion

33.	A particle of mass 2kg is fired at an angle of 37degree with vertical with speed 30m/s . Find The angular momentum about point of projection, when it reaches highest point of trajectory.
Answer» A particle of mass 2kg is fired at an angle of 37degree with vertical with speed 30m/s . Find The angular momentum about point of projection, when it reaches highest point of trajectory.

Discussion

34.	A cord is wound round the circumference of a wheel of radius r. The axis of the wheel is horizontal and the moment of inertia about it is I. A weight mg is attached to the cord at the end. The weight falls from rest. After falling through a distance h, the square of angular velocity of the wheel will be : (There is no slipping between the wheel and the cord)
Answer» A cord is wound round the circumference of a wheel of radius $r$ . The axis of the wheel is horizontal and the moment of inertia about it is $I$ . A weight $m g$ is attached to the cord at the end. The weight falls from rest. After falling through a distance $h$ , the square of angular velocity of the wheel will be : $($ There is no slipping between the wheel and the cord $)$

Discussion

35.	The angle of a prism is 60∘. When light is incident at an angle of 60∘ on the prism, the angle of emergence is 40∘. The angle of incidence i for which the light ray will deviate the least is such that
Answer» The angle of a prism is $60^{\circ}$ . When light is incident at an angle of $60^{\circ}$ on the prism, the angle of emergence is $40^{\circ}$ . The angle of incidence i for which the light ray will deviate the least is such that

Discussion

36.	The quantity of electricity required to reduce 12.3 g of nitro benzene to aniline assuming 50 percent current efficiency is
Answer» The quantity of electricity required to reduce 12.3 g of nitro benzene to aniline assuming 50 percent current efficiency is

Discussion

37.	A projectile is projected with initial velocity 6 ICAP + 2 j cap metre per second from the ground the velocity when it is about to hit the ground is assuming y axis is along vertical direction
Answer» A projectile is projected with initial velocity 6 ICAP + 2 j cap metre per second from the ground the velocity when it is about to hit the ground is assuming y axis is along vertical direction

Discussion

38.	Energy for 6.43 * 10 ^15 photos of 4.27 * 10^14 second -1 frequency in Einstein unit is A)1.20 * 10^ -8 B) 2.58 * 10 ^ -3 C) 1.06 * 10^ -8 D) 8.33 * 10^ 7
Answer» Energy for 6.43 * 10 ^15 photos of 4.27 * 10^14 second -1 frequency in Einstein unit is A)1.20 * 10^ -8 B) 2.58 * 10 ^ -3 C) 1.06 * 10^ -8 D) 8.33 * 10^ 7

38.

Energy for 6.43 * 10 ^15 photos of 4.27 * 10^14 second -1 frequency in Einstein unit is A)1.20 * 10^ -8 B) 2.58 * 10 ^ -3 C) 1.06 * 10^ -8 D) 8.33 * 10^ 7

Answer»

Energy for 6.43 * 10 ^15 photos of 4.27 * 10^14 second -1 frequency in Einstein unit is

A)1.20 * 10^ -8

B) 2.58 * 10 ^ -3

C) 1.06 * 10^ -8

D) 8.33 * 10^ 7

Discussion

39.	Wavelength of a 2 keV photon is,
Answer» Wavelength of a $2 keV$ photon is,

Discussion

40.	Q 13/90 The vector sum of the forces 10 N and 6 Ncan be
Answer» Q 13/90 The vector sum of the forces 10 N and 6 Ncan be

Discussion

41.	A metal ring of mass m and radius R is placed on a smooth horizontal table and is set rotating about its own axis in such a way that each part of the ring moves with a speed v. Find the tension in the ring.
Answer» A metal ring of mass m and radius R is placed on a smooth horizontal table and is set rotating about its own axis in such a way that each part of the ring moves with a speed v. Find the tension in the ring.

Discussion

42.	Find the resistance of an intrinsic Ge rod 1 mm long, 1 mm wide and 1 mm thick at 300 K. The intrinsic carrier density is 2.5×1019 m−3. If the mobility of electron and hole are 0.39 m2V−1s−1 and 0.19 m2V−1s−1, calculate the resistivity.
Answer» Find the resistance of an intrinsic $Ge$ rod $1 mm$ long, $1 mm$ wide and $1 mm$ thick at $300 K$ . The intrinsic carrier density is $2.5 \times 10^{19} m^{- 3}$ . If the mobility of electron and hole are $0.39 m^{2} V^{- 1} s^{- 1}$ and $0.19 m^{2} V^{- 1} s^{- 1}$ , calculate the resistivity.

Discussion

43.	If α and β are the roots of x2−5x+6=0 then 11α+1β is
Answer» If $α and β$ are the roots of $x^{2} - 5 x + 6 = 0$ then $\frac{1}{\frac{1}{α} + \frac{1}{β}}$ is

Discussion

44.	In the following series LCR circuit, find the peak value of source current i0, voltage across capacitor VC and voltage across inductor VL at resonance, respectively.
Answer» In the following series $L C R$ circuit, find the peak value of source current $i_{0}$ , voltage across capacitor $V_{C}$ and voltage across inductor $V_{L}$ at resonance, respectively.

Discussion

45.	There is a box of 70 kg on a rough surface and Ram is just able to pull the box by applying a force of F1 (Figure1) Avinash tries to pull the same box but in different orientation (figure (ii)). He had to apply force F2 is order to just move the box. Who had to apply a lesser force in order to just move the box?
Answer» There is a box of 70 kg on a rough surface and Ram is just able to pull the box by applying a force of $F_{1}$ (Figure1) Avinash tries to pull the same box but in different orientation (figure (ii)). He had to apply force $F_{2}$ is order to just move the box. Who had to apply a lesser force in order to just move the box?

45.

There is a box of 70 kg on a rough surface and Ram is just able to pull the box by applying a force of F1 (Figure1) Avinash tries to pull the same box but in different orientation (figure (ii)). He had to apply force F2 is order to just move the box. Who had to apply a lesser force in order to just move the box?

Answer»

There is a box of 70 kg on a rough surface and Ram is just able to pull the box by applying a force of $F_{1}$ (Figure1) Avinash tries to pull the same box but in different orientation (figure (ii)). He had to apply force $F_{2}$ is order to just move the box. Who had to apply a lesser force in order to just move the box?

Discussion

46.	29. How to find net electric field of hexagon of side 1m with six point charges -q -q -q q q q
Answer» 29. How to find net electric field of hexagon of side 1m with six point charges -q -q -q q q q

Discussion

47.	Question 26 (b)(b) A ball weighing 4 kg of density 4000 kgm–3 is completely immersed in water of density 103kgm–3 Find the force of buoyancy on it. (Given g=10ms–2).
Answer» Question 26 (b) (b) A ball weighing 4 kg of density $4000 k g m^{- 3}$ is completely immersed in water of density $10^{3} k g m^{- 3}$ Find the force of buoyancy on it. (Given $g = 10 m s^{- 2})$ .

Discussion

48.	what is the dimension of electric field
Answer» what is the dimension of electric field

Discussion

49.	A paticle of mass m is moving in a horizontal circle of radius r under a centripetal force equal to -(k/r2),where k is cons†an t.what is the total energy of the particle
Answer» A paticle of mass m is moving in a horizontal circle of radius r under a centripetal force equal to -(k/r2),where k is cons†an t.what is the total energy of the particle

Discussion

50.	A particle is projected at an angle of 30∘ w.r.t horizontal with speed 20 m/s. Take the point of projection as the origin of the coordinate axes and find the position vector(in m) of the particle after 1 s. (Take g=10 m/s2)
Answer» A particle is projected at an angle of $30^{\circ}$ w.r.t horizontal with speed $20 m / s .$ Take the point of projection as the origin of the coordinate axes and find the position vector(in $m$ ) of the particle after $1 s$ . (Take $g = 10 m / s^{2}$ )

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Lenz’s law is a consequence of the law of conservations of :

A hole is made at the bottom of the tank filled with water (density 1000 kg/m3). If the total pressure at the bottom of the tank is 3 atmosphere (1 atmosphere = 105 N/m2), then the velocity of efflux is

The resultant of two forces, one double the other in magnitude, is perpendicular to the smaller of the two forces. The angle between the two forces is

An ideal solenoid of cross-sectional area 10−4 m2 has 500 turns per meter. At the centre of this solenoid, another coil of 100 turns is wrapped closely around it. If the current in the coil changes from 0 A to 2 A in 3.14 ms. The emf developed in the solenoid is

Explain path variable in detail with example.

A rectangular sheet of tin 45 cm by 24 cm is to be made into a box without top, by cutting-off square from each corner and folding up the flaps. What should be the side of the square to be cut-off so that the volume of the box is maximum?

Four charges are placed at the circumference of a dial clock as shown in the figure. If the clock has only hour hand, then the resultant force on a charge +q0 placed at the centre, points in the direction which shows the time as

Water is flowing through a horizontal tube of non - uniform cross - section. At a place the radius of the tube is 1.0 cm and the velocity of water is 2 m/s. Then, what will be the velocity of water at a point where the radius of the pipe is 2.0 cm?

A thin brass rectangular sheet of sides 15.0 cm and 12.0 cm is heated in a furnace to 527∘C and taken out. Find the electric power needed to maintain the sheet at this temperature, given that its emissivity is 0.250 (Neglect heat loss due to convection and σ=5.67×10−8 W/m2− K4)

Explain how the various energy conversions that happen to take the energy from coal to you reading this question on your electronic device.

2. In a Vernier Calliper length of 10 main scale division is 2 mm 20 vernier scale division coincide with 10 main scale division then the least count of instrument is

A boy uses a vernier callipers to measure the thickness of his pencil. He measures it to be 1.40 mm. If the zero error of vernier callipers is +0.02 cm, what is the correct thickness of the pencil?

Two circular coils A and B are placed closed to each other. If the current in the coil A is changed, will some current be induced in coil B? Give reason

energy of h2 atom in ground state is -13.6eV energy of he2+ ion in second excited state is nearly

In an adjoining figure are shown three capacitors C1,C2 and C3 joined to a battery. The correct condition will be (Symbols have their usual meanings)

how power could be same in output and input because if current is changing

A sensor is exposed for time t to a lamp of power P at distance l. The sensor has an opening that is 4d in diameter. Assuming all of the energy is given off as light, the number of photons entering the sensor if the wavelength of the light is λ is

A charged wire of length 3 m lies along x− axis in such a way that its linear charge density is given by λ=2x2 C/m. The total charge on the wire is

If two plane mjrrmir are inclined at angle of 90 then the incident ray and the final reflected ray are parallel or antiparallel? Since interior angles are 180

At absolute zero temperature, pressure of a gas will be

The mid-span deflection simply supported beam AB with loading as shown in figure is given by

13.A charge q is distributed uniformly on a ring of radius r . A sphere of equal radius r is centered at a circumference of ring .find the flux of the electric field through surface of sphere

23. Velocity-time graph of two bodies A and B starting from the same position and moving in a straight line is shown in the picture. Which of the given options are true?

The volume occupied by 4.75 g of acetylene gas at 50C and 750 mm Hg pressure is \text{L}\).(Round off to the nearest integer)(Given, R=0.0826 L atm K−1 mol−1).

A hollow metal sphere of radius 10 cm is charged such that the potential on its surface is 80 volt. The potential at the centre of the sphere is

A boy is standing on a ground which is accelerating vertically upwards with constant acceleration. If boy throws a ball vertically up with velocity v0 relative to plank and it's time of flight is T, the acceleration of the plank is

The amount of steel required such that there is not flexure collapse given combination of loads is equal to ___ mm2. Mu=80kNm;Tu=40kNm;Vu=60kNThe dimension of the beam are 300 mm x 500 mm and effective cover = 40 mm Take M25 concrete and Fe415 steel.974

A pebble is thrown horizontally from a top of a 20m high tower woth an initial velocity 10m/s. The air drag is negligible. The speed of the pebble when it is at the same distance from the top and base of the tower.(g=10m/s

A particle of mass 2kg is fired at an angle of 37degree with vertical with speed 30m/s . Find The angular momentum about point of projection, when it reaches highest point of trajectory.

The angle of a prism is 60∘. When light is incident at an angle of 60∘ on the prism, the angle of emergence is 40∘. The angle of incidence i for which the light ray will deviate the least is such that

The quantity of electricity required to reduce 12.3 g of nitro benzene to aniline assuming 50 percent current efficiency is

A projectile is projected with initial velocity 6 ICAP + 2 j cap metre per second from the ground the velocity when it is about to hit the ground is assuming y axis is along vertical direction

Energy for 6.43 * 10 ^15 photos of 4.27 * 10^14 second -1 frequency in Einstein unit is A)1.20 * 10^ -8 B) 2.58 * 10 ^ -3 C) 1.06 * 10^ -8 D) 8.33 * 10^ 7

Wavelength of a 2 keV photon is,

Q 13/90 The vector sum of the forces 10 N and 6 Ncan be

A metal ring of mass m and radius R is placed on a smooth horizontal table and is set rotating about its own axis in such a way that each part of the ring moves with a speed v. Find the tension in the ring.

Find the resistance of an intrinsic Ge rod 1 mm long, 1 mm wide and 1 mm thick at 300 K. The intrinsic carrier density is 2.5×1019 m−3. If the mobility of electron and hole are 0.39 m2V−1s−1 and 0.19 m2V−1s−1, calculate the resistivity.

If α and β are the roots of x2−5x+6=0 then 11α+1β is

In the following series LCR circuit, find the peak value of source current i0, voltage across capacitor VC and voltage across inductor VL at resonance, respectively.

29. How to find net electric field of hexagon of side 1m with six point charges -q -q -q q q q

Question 26 (b)(b) A ball weighing 4 kg of density 4000 kgm–3 is completely immersed in water of density 103kgm–3 Find the force of buoyancy on it. (Given g=10ms–2).

what is the dimension of electric field

A paticle of mass m is moving in a horizontal circle of radius r under a centripetal force equal to -(k/r2),where k is cons†an t.what is the total energy of the particle

A particle is projected at an angle of 30∘ w.r.t horizontal with speed 20 m/s. Take the point of projection as the origin of the coordinate axes and find the position vector(in m) of the particle after 1 s. (Take g=10 m/s2)