50278 + Interview Questions in Physics

1.	A particle travels 10m in first 5 seconds, 10m in next 3 seconds. Assuming constant acceleration what is distance travelled in next 2 second? 1. 8.3m. 2.9.3m. 3. 10.3 m. 4. None of tgese
Answer» A particle travels 10m in first 5 seconds, 10m in next 3 seconds. Assuming constant acceleration what is distance travelled in next 2 second? 1. 8.3m. 2.9.3m. 3. 10.3 m. 4. None of tgese

Discussion

2.	The storage battery of a car has an emf of 12 V. If the internal resistance of the battery is 0.4 Ω, what is the maximum current that can be drawn from the battery ?
Answer» The storage battery of a car has an emf of $12 V$ . If the internal resistance of the battery is $0.4 Ω$ , what is the maximum current that can be drawn from the battery ?

Discussion

3.	Two sinusoidal waves each of amplitude 2A, travel in the same direction in a medium. If the phase difference between the two waves is 120∘, then find the resultant amplitude of the superimposed wave.
Answer» Two sinusoidal waves each of amplitude $2 A$ , travel in the same direction in a medium. If the phase difference between the two waves is $120^{\circ}$ , then find the resultant amplitude of the superimposed wave.

Discussion

4.	The angular velocity of the second's hand in a watch is
Answer» The angular velocity of the second's hand in a watch is

Discussion

5.	the equation of a wave is given by y=v sin w(x/v-k pie) where w is angular velocity and v is linear velocity find the dimension of x and K
Answer» the equation of a wave is given by y=v sin w(x/v-k pie) where w is angular velocity and v is linear velocity find the dimension of x and K

Discussion

6.	The de Broglie wavelength of an electron having 320 eV of energy is nearly (1 eV=1.6×10−19 J, mass of electron =9.1×10−31 kg, Planck's constant =6.6×10−34 Js)
Answer» The de Broglie wavelength of an electron having $320 eV$ of energy is nearly $(1 eV = 1.6 \times 10^{- 19} J$ , mass of electron $= 9.1 \times 10^{- 31} kg$ , Planck's constant $= 6.6 \times 10^{- 34} Js)$

Discussion

7.	I have multiple dielectrics (of surface area in contact with capacitor as A1,A2andA3) in my capacitor inserted as shown. What is my new capacitance?
Answer» I have multiple dielectrics (of surface area in contact with capacitor as $A_{1}, A_{2} a n d A_{3})$ in my capacitor inserted as shown. What is my new capacitance?

Discussion

8.	Four resistances 40 Ω, 60 Ω, 90 Ω and 110 Ω make the arms of a quadrilateral ABCD. Across AC is a battery having emf 40 V and negligible internal resistance. The potential difference across BD, in Volts, is
Answer» Four resistances $40 Ω, 60 Ω, 90 Ω and 110 Ω$ make the arms of a quadrilateral ABCD. Across $A C$ is a battery having emf $40 V$ and negligible internal resistance. The potential difference across BD, in Volts, is

Discussion

9.	A particle is moving in x-y plane in a circular path with centre at origin. If at an instant the position of particleis given by=1/\surd2(i+j).Then velocity of particle is along(1)1\surd2(i-j)(2)1\surd2(-i+j)(3)1\surd2(i+j)(4Either (1) or (2)
Answer» A particle is moving in x-y plane in a circular path with centre at origin. If at an instant the position of particleis given by=1/\surd2(i+j).Then velocity of particle is along(1)1\surd2(i-j)(2)1\surd2(-i+j)(3)1\surd2(i+j)(4Either (1) or (2)

Discussion

10.	An inclined plane makes an angle 30∘ with the horizontal. A groove OA=5 m cut in the plane makes an angle 30∘ with OX. A short smooth cylinder is free to slide down the influence of gravity. Find the time taken by the cylinder to reach from A to O. (Take g=10 m/s2)
Answer» An inclined plane makes an angle $30^{\circ}$ with the horizontal. A groove $O A = 5 m$ cut in the plane makes an angle $30^{\circ}$ with $O X$ . A short smooth cylinder is free to slide down the influence of gravity. Find the time taken by the cylinder to reach from $A$ to $O$ . $(Take g = 10 {m/s}^{2})$

Discussion

11.	105. Initially switch S was open and circuit has achieved its steady state at t = 0 then switch S is suddenly closed .find the current through resistor R as a function of time
Answer» 105. Initially switch S was open and circuit has achieved its steady state at t = 0 then switch S is suddenly closed .find the current through resistor R as a function of time

Discussion

12.	Determine the height above the dashed line XX' attained by the water stream coming out through the hole is situtated at point B in the diagram given below. Given that h=10 m,L=2 m and d=30∘.
Answer» Determine the height above the dashed line XX' attained by the water stream coming out through the hole is situtated at point B in the diagram given below. Given that $h = 10 m, L = 2 m and d = 30^{\circ}$ .

Discussion

13.	A system of two masses m1 and m2 connected by a string is released from rest as shown in figure. Find the x and y components of acceleration of COM of the system is[All the surfaces shown in the figure are smooth]
Answer» A system of two masses $m_{1}$ and $m_{2}$ connected by a string is released from rest as shown in figure. Find the $x$ and $y$ components of acceleration of COM of the system is [All the surfaces shown in the figure are smooth]

Discussion

14.	Nine persons A,B,C,D,E,F,G,H,I are watching a movie in a theatre sitting in a row facing north. B is at one end of the row. H is seated adjacent to both F and G. C is to the immediate right of D and at the third place to the right of E. A is to the immediate left of F. F is at the third place to the left of B. Who is at the other end of the row?
Answer» Nine persons $A, B, C, D, E, F, G, H, I$ are watching a movie in a theatre sitting in a row facing north. $B$ is at one end of the row. $H$ is seated adjacent to both $F$ and $G .$ $C$ is to the immediate right of $D$ and at the third place to the right of $E .$ $A$ is to the immediate left of $F .$ $F$ is at the third place to the left of $B .$ Who is at the other end of the row?

Discussion

15.	a block of mass m kg is kept on a weighing machine in an elevator . if the elevator is retarding upward by a ms^{-2} the reading of the weighing machine is (kgf
Answer» a block of mass m kg is kept on a weighing machine in an elevator . if the elevator is retarding upward by a ms^{-2} the reading of the weighing machine is (kgf

Discussion

16.	A piece of the iron nail when kept horizontally on the surface of the sand, rests on it but when kept vertically digs a small hole. Why does this happen?
Answer» A piece of the iron nail when kept horizontally on the surface of the sand, rests on it but when kept vertically digs a small hole. Why does this happen?

Discussion

17.	For an isosceles prism of angle A and refractive index μ, it is found that the angle of minimum deviation δm=A. Which of the following option(s) is/are correct?
Answer» For an isosceles prism of angle $A$ and refractive index $μ$ , it is found that the angle of minimum deviation $δ_{m} = A$ . Which of the following option(s) is/are correct?

Discussion

18.	Two objects A and B start moving on a straight road from same point having initially velocity of 40 m/s and 80 m/s respectively. Both applies brake at this instant, retard constantly with 10 m/s^2, when object A is at three fourth of its stopping. The difference between the displacement of A and B is ?
Answer» Two objects A and B start moving on a straight road from same point having initially velocity of 40 m/s and 80 m/s respectively. Both applies brake at this instant, retard constantly with 10 m/s^2, when object A is at three fourth of its stopping. The difference between the displacement of A and B is ?

Discussion

19.	An object is placed at a distance of 10 cm from a convex lens of power 5 D. The position of the image is
Answer» An object is placed at a distance of $10 c m$ from a convex lens of power $5 D .$ The position of the image is

Discussion

20.	15.Two capacitor rated 600 pF,4 kV and 300 pF ,6 kV can work in series up to the potential of ??
Answer» 15.Two capacitor rated 600 pF,4 kV and 300 pF ,6 kV can work in series up to the potential of ??

Discussion

21.	A solid sphere of radius R gravitationally attracts a particle placed at 3R from its centre with a force F1. Now, a spherical cavity of radius R/2 is made in the sphere as shown in the figure and the force becomes F2. The value of F1:F2 is -
Answer» A solid sphere of radius $R$ gravitationally attracts a particle placed at $3 R$ from its centre with a force $F_{1}$ . Now, a spherical cavity of radius $R / 2$ is made in the sphere as shown in the figure and the force becomes $F_{2}$ . The value of $F_{1} : F_{2}$ is -

Discussion

22.	If the velocity-time graph is a straight line parallel to time axis for a body, then the body is having _____.
Answer» If the velocity-time graph is a straight line parallel to time axis for a body, then the body is having _____.

Discussion

23.	In which of the following, pressure exerted on the ground is the least?
Answer» In which of the following, pressure exerted on the ground is the least?

Discussion

24.	92. Which chlorine is more electronegative ,,,, in Clo4- or in Clo-,, (-) represent the negative charge
Answer» 92. Which chlorine is more electronegative ,,,, in Clo4- or in Clo-,, (-) represent the negative charge

Discussion

25.	X+y=
Answer» X+y=

Discussion

26.	If an object is projected vertically upwards with speed,half the escape speed of earth, then the maximumheight attained by it is \lbrack R is radius of earth\rbrack27(2)(3) 2 R(4)3Rl2RS
Answer» If an object is projected vertically upwards with speed,half the escape speed of earth, then the maximumheight attained by it is \lbrack R is radius of earth\rbrack27(2)(3) 2 R(4)3Rl2RS

Discussion

27.	A man goes 10 m towards North, then 20 m towards east. Then, total length of displacement is
Answer» A man goes $10 m$ towards North, then $20 m$ towards east. Then, total length of displacement is

Discussion

28.	A mass of 10 kg is suspended vertically by a rope from the roof. When a horizontal force is applied on the rope at some point, the rope deviated at an angle 45∘ at the roof point. If the suspended mass is at equilibrium, the magnitude of the force applied is (g=10 ms−2)
Answer» A mass of $10 kg$ is suspended vertically by a rope from the roof. When a horizontal force is applied on the rope at some point, the rope deviated at an angle $45^{\circ}$ at the roof point. If the suspended mass is at equilibrium, the magnitude of the force applied is ( $g = 10 {ms}^{- 2}$ )

Discussion

29.	17. What is discharge potential? And how to determine lowest discharge potential among Na+ ,Ag+, Al+3 and Cu+2?
Answer» 17. What is discharge potential? And how to determine lowest discharge potential among Na+ ,Ag+, Al+3 and Cu+2?

Discussion

30.	Ina test experiment on a model aeroplane in a wind tunnel, the flowspeeds on the upper and lower surfaces of the wing are 70 m s–1and63 m s–1respectively. What is the lift on the wing if its area is 2.5 m2?Take the density of air to be 1.3 kg m–3.
Answer» In a test experiment on a model aeroplane in a wind tunnel, the flow speeds on the upper and lower surfaces of the wing are 70 m s^–1and 63 m s^–1 respectively. What is the lift on the wing if its area is 2.5 m²? Take the density of air to be 1.3 kg m^–3.

Discussion

31.	A mass of 3.2 kg is rotating on a circular path of radius 0.6 m with an angular velocity of 66 rad/s. The new radius of the path is 0.8 m. What is the new value of angular velocity?
Answer» A mass of 3.2 kg is rotating on a circular path of radius 0.6 m with an angular velocity of 66 rad/s. The new radius of the path is 0.8 m. What is the new value of angular velocity?

Discussion

32.	A boat going downstream crosses a float at a point A. t1 minutes later the boat reverses its direction and in the next t2 minutes it crosses the float at a dis†an ce L from the point A. The velocity of the river i
Answer» A boat going downstream crosses a float at a point A. t1 minutes later the boat reverses its direction and in the next t2 minutes it crosses the float at a dis†an ce L from the point A. The velocity of the river i

Discussion

33.	A block of mass m1 rests on a horizontal table. A light string connected to it passes over a frictionless pulley at the edge of table and form its other end another block B of mass m2 is suspended The coefficient of kinetic friction between block and table is Uk. When the block A is sliding on the table, find out tension in the string.
Answer» A block of mass m1 rests on a horizontal table. A light string connected to it passes over a frictionless pulley at the edge of table and form its other end another block B of mass m2 is suspended The coefficient of kinetic friction between block and table is Uk. When the block A is sliding on the table, find out tension in the string.

Discussion

34.	An electromagnetic radiation given byE=E0[sin(2π ν1t)+sin(2π ν2t)] is incident on a photocell whose work function is 2.0 eV. Then the maximum kinetic energy (upto 2 decimal points accuracy) of photoelectrons will be eV[Take h=4.14×10−15 eVs ; ν1=1.3×1015 Hz and ν2=1.1×1015 Hz]
Answer» An electromagnetic radiation given by $E = E_{0} [sin (2 π ν_{1} t) + sin (2 π ν_{2} t)]$ is incident on a photocell whose work function is $2.0 eV$ . Then the maximum kinetic energy (upto $2$ decimal points accuracy) of photoelectrons will be $eV$ [Take $h = 4.14 \times 10^{- 15} eVs; ν_{1} = 1.3 \times 10^{15} Hz$ and $ν_{2} = 1.1 \times 10^{15} Hz$ ]

Discussion

35.	Consider the earlier problem where we had a point source radiating energy at the rate of 10 Joules per second, or 10 Watts. What can you say about the intensities I1 and I2 at two points on spheres of radii and r1 and r2 respectively, centered at the source?
Answer» Consider the earlier problem where we had a point source radiating energy at the rate of 10 Joules per second, or 10 Watts. What can you say about the intensities $I_{1} a n d I_{2}$ at two points on spheres of radii and $r_{1} a n d r_{2}$ respectively, centered at the source?

35.

Consider the earlier problem where we had a point source radiating energy at the rate of 10 Joules per second, or 10 Watts. What can you say about the intensities I1 and I2 at two points on spheres of radii and r1 and r2 respectively, centered at the source?

Answer»

Consider the earlier problem where we had a point source radiating energy at the rate of 10 Joules per second, or 10 Watts. What can you say about the intensities $I_{1} a n d I_{2}$ at two points on spheres of radii and $r_{1} a n d r_{2}$ respectively, centered at the source?

Discussion

36.	Fusion reaction is given by 126C+126C→2010Ne+42He.If B.E. per nucleon for 126C is X, B.E. per nucleon for 2010Ne is Y and B.E. per nucleon for 42He is Z, then Q value of reaction is
Answer» Fusion reaction is given by $_{6}^{12} C +_{6}^{12} C \to_{10}^{20} N e +_{2}^{4} H e$ . If B.E. per nucleon for $_{6}^{12} C$ is X, B.E. per nucleon for $_{10}^{20} N e$ is Y and B.E. per nucleon for $_{2}^{4} H e$ is Z, then Q value of reaction is

Discussion

37.	Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42 mW. (a) Find the energy and momentum of each photon in the light beam, (b) How many photons per second, on the average, arrive at a target irradiated by this beam? (Assume the beam to have uniform cross-section which is less than the target area), and (c) How fast does a hydrogen atom have to travel in order to have the same momentum as that of the photon?
Answer» Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42 mW. (a) Find the energy and momentum of each photon in the light beam, (b) How many photons per second, on the average, arrive at a target irradiated by this beam? (Assume the beam to have uniform cross-section which is less than the target area), and (c) How fast does a hydrogen atom have to travel in order to have the same momentum as that of the photon?

Discussion

38.	An electrical technician requires capacitance of .2 microfarad in a circuit across a potential difference of 1 kilovolt a large number of 1 microfarad capacitor available to him each of which can with stand a potential difference of not more than 400 volt the minimum number of capacitors required is
Answer» An electrical technician requires capacitance of .2 microfarad in a circuit across a potential difference of 1 kilovolt a large number of 1 microfarad capacitor available to him each of which can with stand a potential difference of not more than 400 volt the minimum number of capacitors required is

Discussion

39.	Two masses M and m are attached to a vertical axis by weightless threads of combined length l. They are set in rotational motion in a horizontal plane about this axis with constant angular velocity ω. If the tensions in the threads are the same during motion, the distance of M from the axis is
Answer» Two masses M and m are attached to a vertical axis by weightless threads of combined length l. They are set in rotational motion in a horizontal plane about this axis with constant angular velocity $ω$ . If the tensions in the threads are the same during motion, the distance of M from the axis is

Discussion

40.	The position of a particle moving along x-axis is given by x=(t2−15t+10) m, where t is in second. Find the time when particle comes at rest?
Answer» The position of a particle moving along x-axis is given by $x = (t^{2} - 15 t + 10) m$ , where $t$ is in second. Find the time when particle comes at rest?

Discussion

41.	86.A particle is moving with a constant acceleration of 20 m/s.if the final velocity of particle is 30m/s.what is the distance travelled by the particle in last 2seconds.
Answer» 86.A particle is moving with a constant acceleration of 20 m/s.if the final velocity of particle is 30m/s.what is the distance travelled by the particle in last 2seconds.

Discussion

42.	7. A current of 3A flowing through a coil of inductance 2H is increasing at the rate of 0.5 A/s. The energy stored in the inductor per unit time at this instant is
Answer» 7. A current of 3A flowing through a coil of inductance 2H is increasing at the rate of 0.5 A/s. The energy stored in the inductor per unit time at this instant is

Discussion

43.	A thin uniform vertical rod of mass m and length l pivoted at point O is shown in the given figure. The combined stiffness of the springs is equal to k. The mass of the springs is negligible. The angular frequency of small oscillation is
Answer» A thin uniform vertical rod of mass m and length l pivoted at point O is shown in the given figure. The combined stiffness of the springs is equal to k. The mass of the springs is negligible. The angular frequency of small oscillation is

Discussion

44.	22.Two cells are connected with 2 ohm resistance and a tangent galvanometer. If the deflection in tangent galvanometer is 30^° , then the resistance of coil is
Answer» 22.Two cells are connected with 2 ohm resistance and a tangent galvanometer. If the deflection in tangent galvanometer is 30^° , then the resistance of coil is

Discussion

45.	A radioactive nucleus of mass number A undergoes α−emission to form a stable element. What will be the recoil velocity of the daughter nucleus if v is the velocity of α−emission?
Answer» A radioactive nucleus of mass number A undergoes $α -$ emission to form a stable element. What will be the recoil velocity of the daughter nucleus if v is the velocity of $α -$ emission?

Discussion

46.	From a supply of identical capacitors rated 8 μF,250 V, the minimum number of capacitors required to form a composite 16 μF, 1000 V is
Answer» From a supply of identical capacitors rated $8 μ F, 250 V$ , the minimum number of capacitors required to form a composite $16 μ F$ , $1000 V$ is

Discussion

47.	A large open tank has two holes in the wall. One is a square hole of side L at a depth y from the top and the other is a circular hole of radius R at a depth 4y from the top. When the tank is completely filled with water, if the quantity of water flowing out per second from both the holes is same, then R is equal to
Answer» A large open tank has two holes in the wall. One is a square hole of side $L$ at a depth y from the top and the other is a circular hole of radius $R$ at a depth $4 y$ from the top. When the tank is completely filled with water, if the quantity of water flowing out per second from both the holes is same, then $R$ is equal to

Discussion

48.	Choose the incorrect statement(1) Mass is the measure of inertia(2) Action and Reaction pair cannot bedistinguishedn a circular motion centripetal force acts onthe body(4) All of these
Answer» Choose the incorrect statement(1) Mass is the measure of inertia(2) Action and Reaction pair cannot bedistinguishedn a circular motion centripetal force acts onthe body(4) All of these

Discussion

49.	For the equation, y=Asin2π(ax+bt+π/4), match the following columns.Column IColumn II(A) Frequency of wave(Hz)(p) a(B) wavelength of wave(m)(q) b(C) Phase difference between two points 14a m distance apart(r) π(D) Phase difference of a particle after a time interval of 18b s(s) π2(t) None of above
Answer» For the equation, $y = A sin 2 π (a x + b t + π / 4)$ , match the following columns. $\begin{matrix} Column I & Column II (A) Frequency of wave(Hz) & (p) a (B) wavelength of wave(m) & (q) b (C) Phase difference between two points \frac{1}{4 a} m distance apart & (r) π (D) Phase difference of a particle after a time interval of \frac{1}{8 b} s & (s) \frac{π}{2} (t) None of above \end{matrix}$

Discussion

50.	114.An electric heater has three windings. If two windings are connected in parallel and third is connected to them in series, then with various combinations , the water in the vessel begins to boil in 40, 45 and 72 minutes. The time taken to begin boiling if all windings are connected in series is Ts and if all are connected in parallel is Tp. Find ((Ts:Tp)-4)
Answer» 114.An electric heater has three windings. If two windings are connected in parallel and third is connected to them in series, then with various combinations , the water in the vessel begins to boil in 40, 45 and 72 minutes. The time taken to begin boiling if all windings are connected in series is Ts and if all are connected in parallel is Tp. Find ((Ts:Tp)-4)

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A particle travels 10m in first 5 seconds, 10m in next 3 seconds. Assuming constant acceleration what is distance travelled in next 2 second? 1. 8.3m. 2.9.3m. 3. 10.3 m. 4. None of tgese

The storage battery of a car has an emf of 12 V. If the internal resistance of the battery is 0.4 Ω, what is the maximum current that can be drawn from the battery ?

Two sinusoidal waves each of amplitude 2A, travel in the same direction in a medium. If the phase difference between the two waves is 120∘, then find the resultant amplitude of the superimposed wave.

The angular velocity of the second's hand in a watch is

the equation of a wave is given by y=v sin w(x/v-k pie) where w is angular velocity and v is linear velocity find the dimension of x and K

The de Broglie wavelength of an electron having 320 eV of energy is nearly (1 eV=1.6×10−19 J, mass of electron =9.1×10−31 kg, Planck's constant =6.6×10−34 Js)

I have multiple dielectrics (of surface area in contact with capacitor as A1,A2andA3) in my capacitor inserted as shown. What is my new capacitance?

Four resistances 40 Ω, 60 Ω, 90 Ω and 110 Ω make the arms of a quadrilateral ABCD. Across AC is a battery having emf 40 V and negligible internal resistance. The potential difference across BD, in Volts, is

A particle is moving in x-y plane in a circular path with centre at origin. If at an instant the position of particleis given by=1/\surd2(i+j).Then velocity of particle is along(1)1\surd2(i-j)(2)1\surd2(-i+j)(3)1\surd2(i+j)(4Either (1) or (2)

An inclined plane makes an angle 30∘ with the horizontal. A groove OA=5 m cut in the plane makes an angle 30∘ with OX. A short smooth cylinder is free to slide down the influence of gravity. Find the time taken by the cylinder to reach from A to O. (Take g=10 m/s2)

105. Initially switch S was open and circuit has achieved its steady state at t = 0 then switch S is suddenly closed .find the current through resistor R as a function of time

Determine the height above the dashed line XX' attained by the water stream coming out through the hole is situtated at point B in the diagram given below. Given that h=10 m,L=2 m and d=30∘.

A system of two masses m1 and m2 connected by a string is released from rest as shown in figure. Find the x and y components of acceleration of COM of the system is[All the surfaces shown in the figure are smooth]

a block of mass m kg is kept on a weighing machine in an elevator . if the elevator is retarding upward by a ms^{-2} the reading of the weighing machine is (kgf

A piece of the iron nail when kept horizontally on the surface of the sand, rests on it but when kept vertically digs a small hole. Why does this happen?

For an isosceles prism of angle A and refractive index μ, it is found that the angle of minimum deviation δm=A. Which of the following option(s) is/are correct?

An object is placed at a distance of 10 cm from a convex lens of power 5 D. The position of the image is

15.Two capacitor rated 600 pF,4 kV and 300 pF ,6 kV can work in series up to the potential of ??

A solid sphere of radius R gravitationally attracts a particle placed at 3R from its centre with a force F1. Now, a spherical cavity of radius R/2 is made in the sphere as shown in the figure and the force becomes F2. The value of F1:F2 is -

If the velocity-time graph is a straight line parallel to time axis for a body, then the body is having _____.

In which of the following, pressure exerted on the ground is the least?

92. Which chlorine is more electronegative ,,,, in Clo4- or in Clo-,, (-) represent the negative charge

X+y=

If an object is projected vertically upwards with speed,half the escape speed of earth, then the maximumheight attained by it is \lbrack R is radius of earth\rbrack27(2)(3) 2 R(4)3Rl2RS

A man goes 10 m towards North, then 20 m towards east. Then, total length of displacement is

A mass of 10 kg is suspended vertically by a rope from the roof. When a horizontal force is applied on the rope at some point, the rope deviated at an angle 45∘ at the roof point. If the suspended mass is at equilibrium, the magnitude of the force applied is (g=10 ms−2)

17. What is discharge potential? And how to determine lowest discharge potential among Na+ ,Ag+, Al+3 and Cu+2?

Ina test experiment on a model aeroplane in a wind tunnel, the flowspeeds on the upper and lower surfaces of the wing are 70 m s–1and63 m s–1respectively. What is the lift on the wing if its area is 2.5 m2?Take the density of air to be 1.3 kg m–3.

A mass of 3.2 kg is rotating on a circular path of radius 0.6 m with an angular velocity of 66 rad/s. The new radius of the path is 0.8 m. What is the new value of angular velocity?

A boat going downstream crosses a float at a point A. t1 minutes later the boat reverses its direction and in the next t2 minutes it crosses the float at a dis†an ce L from the point A. The velocity of the river i

An electromagnetic radiation given byE=E0[sin(2π ν1t)+sin(2π ν2t)] is incident on a photocell whose work function is 2.0 eV. Then the maximum kinetic energy (upto 2 decimal points accuracy) of photoelectrons will be eV[Take h=4.14×10−15 eVs ; ν1=1.3×1015 Hz and ν2=1.1×1015 Hz]

Consider the earlier problem where we had a point source radiating energy at the rate of 10 Joules per second, or 10 Watts. What can you say about the intensities I1 and I2 at two points on spheres of radii and r1 and r2 respectively, centered at the source?

Fusion reaction is given by 126C+126C→2010Ne+42He.If B.E. per nucleon for 126C is X, B.E. per nucleon for 2010Ne is Y and B.E. per nucleon for 42He is Z, then Q value of reaction is

Two masses M and m are attached to a vertical axis by weightless threads of combined length l. They are set in rotational motion in a horizontal plane about this axis with constant angular velocity ω. If the tensions in the threads are the same during motion, the distance of M from the axis is

The position of a particle moving along x-axis is given by x=(t2−15t+10) m, where t is in second. Find the time when particle comes at rest?

86.A particle is moving with a constant acceleration of 20 m/s.if the final velocity of particle is 30m/s.what is the distance travelled by the particle in last 2seconds.

7. A current of 3A flowing through a coil of inductance 2H is increasing at the rate of 0.5 A/s. The energy stored in the inductor per unit time at this instant is

A thin uniform vertical rod of mass m and length l pivoted at point O is shown in the given figure. The combined stiffness of the springs is equal to k. The mass of the springs is negligible. The angular frequency of small oscillation is

22.Two cells are connected with 2 ohm resistance and a tangent galvanometer. If the deflection in tangent galvanometer is 30^° , then the resistance of coil is

A radioactive nucleus of mass number A undergoes α−emission to form a stable element. What will be the recoil velocity of the daughter nucleus if v is the velocity of α−emission?

From a supply of identical capacitors rated 8 μF,250 V, the minimum number of capacitors required to form a composite 16 μF, 1000 V is

Choose the incorrect statement(1) Mass is the measure of inertia(2) Action and Reaction pair cannot bedistinguishedn a circular motion centripetal force acts onthe body(4) All of these