50278 + Interview Questions in Physics

1.	The variation of acceleration due to gravity g with distance d from the centre of the earth is best represented by (R = Earth's radius)
Answer» The variation of acceleration due to gravity $g$ with distance $d$ from the centre of the earth is best represented by ( $R$ = Earth's radius)

Discussion

2.	4.At t=0,an arrow is fired vertically upward with a speed of 100m/s.A second arrow is fired vertically upwards with the same speed at t=5s.Then, (A)The two arrows will be at the same height above the ground at t=12.5s (B)The two arrows will reach back their starting points at t=20s and t=25 (C)The ratio of the speeds of the first and second arrows at t=20s will be 2:1. (D)The mqximum height attained by either arrow will be 1000m
Answer» 4.At t=0,an arrow is fired vertically upward with a speed of 100m/s.A second arrow is fired vertically upwards with the same speed at t=5s.Then, (A)The two arrows will be at the same height above the ground at t=12.5s (B)The two arrows will reach back their starting points at t=20s and t=25 (C)The ratio of the speeds of the first and second arrows at t=20s will be 2:1. (D)The mqximum height attained by either arrow will be 1000m

Discussion

3.	Which of the following is the correct statement regarding the nature of the image formed by a convex mirror (for a real object)?
Answer» Which of the following is the correct statement regarding the nature of the image formed by a convex mirror (for a real object)?

Discussion

4.	157. What is the flux through a cube of side 'a' if a point charge q is at one of it's corner?
Answer» 157. What is the flux through a cube of side 'a' if a point charge q is at one of it's corner?

Discussion

5.	Question 14Which of the following statement is correct?(a) A person with myopia can see distant objects clearly(b) A person with hypermetropia can see nearby objects clearly(c) A person with myopia can see nearby objects clearly(d) A person with hypermetropia cannot see distant objects clearly
Answer» Question 14 Which of the following statement is correct? (a) A person with myopia can see distant objects clearly (b) A person with hypermetropia can see nearby objects clearly (c) A person with myopia can see nearby objects clearly (d) A person with hypermetropia cannot see distant objects clearly

Discussion

6.	32.Two identical blocks A and B are connected with a spring of spring constant k as shown in figure. If block B is moving rightwards with speed Vo then maximum extension In the spring will be?
Answer» 32.Two identical blocks A and B are connected with a spring of spring constant k as shown in figure. If block B is moving rightwards with speed Vo then maximum extension In the spring will be?

Discussion

7.	A stone is dropped from a height h. It hits the ground with a certain momentum P. If the same stone is drpped from a height 100% more than the previous height, the momentum when it hits the ground will change by
Answer» A stone is dropped from a height h. It hits the ground with a certain momentum P. If the same stone is drpped from a height 100% more than the previous height, the momentum when it hits the ground will change by

Discussion

8.	A simple pendulum of string length l and bob of mass m is displaced from its equilibrium position O to a position P so that the height of P above O is h. It is then released. What is the tension in the string when the bob passes through the equilibrium position O? Neglect friction. V is the velocity of the bob at O.
Answer» A simple pendulum of string length l and bob of mass m is displaced from its equilibrium position O to a position P so that the height of P above O is h. It is then released. What is the tension in the string when the bob passes through the equilibrium position O? Neglect friction. V is the velocity of the bob at O.

Discussion

9.	Which of the following may represent electric field lines?
Answer» Which of the following may represent electric field lines?

Discussion

10.	An object is thrown at an angle of 60∘ with the horizontal with kinetic energy K. What will be its kinetic energy at highest point?
Answer» An object is thrown at an angle of $60^{\circ}$ with the horizontal with kinetic energy K. What will be its kinetic energy at highest point?

Discussion

11.	A 3 kg ball moving in rightward direction on a horizontal surface with speed 4 m/s collides with a 4 kg ball moving ahead of it, in rightward direction with a speed of 2 m/s. If the coefficient of restitution is 0.6, find the loss in KE due to collision.
Answer» A $3 kg$ ball moving in rightward direction on a horizontal surface with speed $4 m/s$ collides with a $4 kg$ ball moving ahead of it, in rightward direction with a speed of $2 m/s$ . If the coefficient of restitution is $0.6$ , find the loss in $K E$ due to collision.

Discussion

12.	61. A diverging lens of focal length 20 cm and a convergingmirror of focal length 10 cm are placed coaxially at aseparation of 5 cm. Where should an object be placed sothat a real image is formed at the object itself?1062
Answer» 61. A diverging lens of focal length 20 cm and a convergingmirror of focal length 10 cm are placed coaxially at aseparation of 5 cm. Where should an object be placed sothat a real image is formed at the object itself?1062

Discussion

13.	a particle does vertical circular motion with radius r at an instant the velocity of particle is v and the angle made by its wire with vertical is theta and the angle made by its net acceleration from horizontal is alpha find the value of alpha
Answer» a particle does vertical circular motion with radius r at an instant the velocity of particle is v and the angle made by its wire with vertical is theta and the angle made by its net acceleration from horizontal is alpha find the value of alpha

Discussion

14.	A sphere of mass M and radius R2 has a concentric cavity of radius R1 as shown in figure. The force F exerted by the sphere on a particle of mass m located at a distance r from the centre of sphere varies as (0≤r≤∞)
Answer» A sphere of mass M and radius R₂ has a concentric cavity of radius R₁ as shown in figure. The force F exerted by the sphere on a particle of mass m located at a distance r from the centre of sphere varies as $(0 \leq r \leq \infty)$

Discussion

15.	a body of mass 2kg is moving along north east direction with speed 2 m/s A force 0.2N is applied on the body due rest for 10 seconds the velocity of the body is
Answer» a body of mass 2kg is moving along north east direction with speed 2 m/s A force 0.2N is applied on the body due rest for 10 seconds the velocity of the body is

Discussion

16.	We know that the sky is blue because blue light is scattered more than other colors because it has a short wavelength. And the red-orange-yellow during the sunrise & sunset, since light has to travel a larger distance so we see these colours since they are scattered the least.But why does the sky not appear green between sunrise and sunset?We see all the colours of the VIBGYOR spectrum, but never green. Why isn't the distance between Sun and Earth never optimum for us to see a Green Sky?
Answer» We know that the sky is blue because blue light is scattered more than other colors because it has a short wavelength. And the red-orange-yellow during the sunrise & sunset, since light has to travel a larger distance so we see these colours since they are scattered the least. But why does the sky not appear green between sunrise and sunset? We see all the colours of the VIBGYOR spectrum, but never green. Why isn't the distance between Sun and Earth never optimum for us to see a Green Sky?

Discussion

17.	In an inelastic collision of two bodies, which of the following quantities do not change before and after the collision?
Answer» In an inelastic collision of two bodies, which of the following quantities do not change before and after the collision?

Discussion

18.	A projectile is thrown from a point O on the ground at an angle 45∘ from the vertical and with a speed 5√2 m/s. The projectile at the highest point of its trajectory splits into two equal parts. One part falls vertically down to the ground, 0.5 s after the splitting. The other part, t seconds after the splitting, falls to the ground at a distance x meters from the point O. The acceleration due to gravity g=10 m/s2. The value of t is
Answer» A projectile is thrown from a point $O$ on the ground at an angle $45^{\circ}$ from the vertical and with a speed $5 \sqrt{2} m/s$ . The projectile at the highest point of its trajectory splits into two equal parts. One part falls vertically down to the ground, $0.5 s$ after the splitting. The other part, $t$ seconds after the splitting, falls to the ground at a distance $x$ meters from the point $O .$ The acceleration due to gravity $g = 10 {m/s}^{2}$ . The value of $t$ is

Discussion

19.	A uniform rod of length l and mass m is fixed at the centre. A spring of spring constant k is connected to rod and wall as shown in the figure. The rod is displaced by small angle θ and released. Find time period of oscillation.
Answer» A uniform rod of length $l$ and mass $m$ is fixed at the centre. A spring of spring constant $k$ is connected to rod and wall as shown in the figure. The rod is displaced by small angle $θ$ and released. Find time period of oscillation.

Discussion

20.	In an electromagnetic wave in free space the root mean square value of electric field is 6 . The peak value of magnetic field is
Answer» In an electromagnetic wave in free space the root mean square value of electric field is 6 . The peak value of magnetic field is

Discussion

21.	The mean free path for gas molecules with molecular diameter d and number density n is proportional to
Answer» The mean free path for gas molecules with molecular diameter $d$ and number density $n$ is proportional to

Discussion

22.	Why does bond angle in hydrides decrease on going down the group?
Answer» Why does bond angle in hydrides decrease on going down the group?

Discussion

23.	From a battery of potential difference 20 V, current 3 A flows through a wire for 90 min. Find the electrical energy supplied by the battery.
Answer» From a battery of potential difference 20 V, current 3 A flows through a wire for 90 min. Find the electrical energy supplied by the battery.

Discussion

24.	If the potential energy of first orbit is taken to be zeroin hydrogen atom, then kinetic energy of secondorbit will be(1) 3.4 eV (2) 13.6 eV(3) 1.5 eV (4) 7.3 eV
Answer» If the potential energy of first orbit is taken to be zero in hydrogen atom, then kinetic energy of second orbit will be (1) 3.4 eV (2) 13.6 eV (3) 1.5 eV (4) 7.3 eV

Discussion

25.	A 3-phase, 5 kW induction motor has a p.f. of 0.75 lagging. A bank of capacitors is connected in delta across the supply terminals and p.f is raised to 0.9 lagging. The kVAR rating of capacitor connected in each phase is ____ kVAR.0.66
Answer» A 3-phase, 5 kW induction motor has a p.f. of 0.75 lagging. A bank of capacitors is connected in delta across the supply terminals and p.f is raised to 0.9 lagging. The kVAR rating of capacitor connected in each phase is ____ kVAR. 0.66

Discussion

26.	The ballon , the light rope and the monkey shown in figure are at rest in the air. If the monkey reaches the top of the rope , by what distance does the ballon descent ? Mass of the ballon descent ? Mass of the ballon = M , mass of the monkey = m and the lenght of the rope ascended by the monkey = L.
Answer» The ballon , the light rope and the monkey shown in figure are at rest in the air. If the monkey reaches the top of the rope , by what distance does the ballon descent ? Mass of the ballon descent ? Mass of the ballon = M , mass of the monkey = m and the lenght of the rope ascended by the monkey = L.

26.

The ballon , the light rope and the monkey shown in figure are at rest in the air. If the monkey reaches the top of the rope , by what distance does the ballon descent ? Mass of the ballon descent ? Mass of the ballon = M , mass of the monkey = m and the lenght of the rope ascended by the monkey = L.

Answer»

The ballon , the light rope and the monkey shown in figure are at rest in the air. If the monkey reaches the top of the rope , by what distance does the ballon descent ? Mass of the ballon descent ? Mass of the ballon = M , mass of the monkey = m and the lenght of the rope ascended by the monkey = L.

Discussion

27.	57.A convex lens forms a real image 9 cm long on a screen. Without altering the position of the object and the screen, the lens is displaced and we get again a real image 4 cm long on the screen. Then the length of the object is :- (1) 9cm (2) 4cm (3) 6cm (4) 36cm Click here to view details:
Answer» 57.A convex lens forms a real image 9 cm long on a screen. Without altering the position of the object and the screen, the lens is displaced and we get again a real image 4 cm long on the screen. Then the length of the object is :- (1) 9cm (2) 4cm (3) 6cm (4) 36cm Click here to view details:

Discussion

28.	If a pushing force making an angle alpha with horizontal is applied on a block of mass m placed on a horizontal table and angle of friction is beta , then minimum magnitude of force required to move the block is
Answer» If a pushing force making an angle alpha with horizontal is applied on a block of mass m placed on a horizontal table and angle of friction is beta , then minimum magnitude of force required to move the block is

Discussion

29.	If the two vectors ¯A=2^i+3^j+4^ and ¯B=^i+2^j−n^k are perpendicular, then the value of n is:
Answer» If the two vectors $¯ A = 2^i + 3^j + 4^a n d ¯ B =^i + 2^j - n^k$ are perpendicular, then the value of n is:

Discussion

30.	Consider a scenario where a bus is moving with a constant speed. A person inside the bus, started pushing the bus from inside. Which of the following statements are true.
Answer» Consider a scenario where a bus is moving with a constant speed. A person inside the bus, started pushing the bus from inside. Which of the following statements are true.

Discussion

31.	two concentric spherical conducting shells of radius r and R (r
Answer» two concentric spherical conducting shells of radius r and R (r

Discussion

32.	In a simple harmonic motion the acceleration-(1) Leads displacement by 180 °(2) Leads velocity by 90 ° (3) Leads velocity by 180 degrees(4) Both (1) & (2)
Answer» In a simple harmonic motion the acceleration- (1) Leads displacement by 180 ° (2) Leads velocity by 90 ° (3) Leads velocity by 180 degrees (4) Both (1) & (2)

Discussion

33.	A capacitor of Capacitance C is charged to potential V0 and is connected in circuit as shown in the figure, Switch S1 is closed at t=0. After time t=π√LC6, switch S1 is opened , while S2 is closed. If initially both the switches were open and capacitor of capacitance 2C was uncharged, the maximum charge stored on 2C would be
Answer» A capacitor of Capacitance $C$ is charged to potential $V_{0}$ and is connected in circuit as shown in the figure, Switch $S_{1}$ is closed at $t = 0.$ After time $t = \frac{π \sqrt{L C}}{6},$ switch $S_{1}$ is opened , while $S_{2}$ is closed. If initially both the switches were open and capacitor of capacitance $2 C$ was uncharged, the maximum charge stored on $2 C$ would be

Discussion

34.	The disc of mass M with uniform surface mass density σ is shown in the figure. The centre of mass of the quarter disc (the shaded area) is at the position (x3Rπ,x3Rπ), then, x is _______.(Round off to the nearest integer)(R is the radius of disc)
Answer» The disc of mass $M$ with uniform surface mass density $σ$ is shown in the figure. The centre of mass of the quarter disc $($ the shaded area $)$ is at the position $(\frac{x}{3} \frac{R}{π}, \frac{x}{3} \frac{R}{π})$ , then, $x$ is _______. $($ Round off to the nearest integer $)$ $(R$ is the radius of disc $)$

Discussion

35.	A particle falling from rest under gravity covers height H in 2.828 second. The time taken by it to cover first half of the height is approximately
Answer» A particle falling from rest under gravity covers height H in 2.828 second. The time taken by it to cover first half of the height is approximately

Discussion

36.	32 What is meant by x rays defraction and how to find bond length with it
Answer» 32 What is meant by x rays defraction and how to find bond length with it

Discussion

37.	A uniform rope of length 13 m tied on peg A on a wall passes over frictionless peg B fixed in level with the peg A as shown in figure. In equilibrium, if the length of the rope hanging between pegs is 8 m, then angle θ [in degrees] which rope makes with wall is (Write upto two digits after the decimal point.)
Answer» A uniform rope of length 13 m tied on peg A on a wall passes over frictionless peg B fixed in level with the peg A as shown in figure. In equilibrium, if the length of the rope hanging between pegs is 8 m, then angle $θ$ [in degrees] which rope makes with wall is (Write upto two digits after the decimal point.)

Discussion

38.	85. water is filled in a tank up to 3 metre height. the base of the tank is at height 1 m above the ground. what should be the height of a hole made in it. so that water can be sprayed up to a maximum horizontal distance.
Answer» 85. water is filled in a tank up to 3 metre height. the base of the tank is at height 1 m above the ground. what should be the height of a hole made in it. so that water can be sprayed up to a maximum horizontal distance.

Discussion

39.	The resultant magnetic moment of the following arrangement is-
Answer» The resultant magnetic moment of the following arrangement is-

Discussion

40.	If the position vectors of the points A,B,C,D are (0,2,1),(3,1,1),(−5,3,2),(2,4,1) respectively and if −−→PA+−−→PB+−−→PC+−−→PD=→0, then the position vector of P is
Answer» If the position vectors of the points $A, B, C, D$ are $(0, 2, 1), (3, 1, 1), (- 5, 3, 2), (2, 4, 1)$ respectively and if $- - \to P A + - - \to P B + - - \to P C + - - \to P D = \to 0,$ then the position vector of $P$ is

Discussion

41.	A conducting sphere of radius 10 cm is charged with 10μC. Another uncharged sphere of radius 20 cm is allowed to touch it for some time. After that if the spheres are seperated, then surface charge density on the spheres will be in the ratio of
Answer» A conducting sphere of radius $10 cm$ is charged with $10 μ C$ . Another uncharged sphere of radius $20 cm$ is allowed to touch it for some time. After that if the spheres are seperated, then surface charge density on the spheres will be in the ratio of

Discussion

42.	How many unique solutions does the equation 4x2+4x+1=0 have?
Answer» How many unique solutions does the equation $4 x^{2} + 4 x + 1 = 0$ have?

Discussion

43.	In the Young's double slit experiment using a monochromatic light of wavelength λ, the path difference (in terms of an integer n) corresponding to any point having half the peak intensity is
Answer» In the Young's double slit experiment using a monochromatic light of wavelength $λ$ , the path difference (in terms of an integer n) corresponding to any point having half the peak intensity is

Discussion

44.	Two capacitors A and B with capacitances 3 μF and 2 μF are charged to a potential difference of 100 V and 180 V respectively. They are connected to an uncharged 2 μF capacitor C through a switch S as shown. When the switch is pressed, the charge flown in the circuit is
Answer» Two capacitors $A$ and $B$ with capacitances $3 μ F$ and $2 μ F$ are charged to a potential difference of $100 V$ and $180 V$ respectively. They are connected to an uncharged $2 μ F$ capacitor $C$ through a switch $S$ as shown. When the switch is pressed, the charge flown in the circuit is

Discussion

45.	A low pass analog signal with bandwidth of 20 kHz is sampled at nyquist rate and quantized using a 16-level uniform quantizer. The resultant digital signal is transmitted using M-ary PSK with raised cosine pulse (roll-off factor 0.3) shaping of baseband data. If the channel bandwidth available to transmit the M-ary PSK signal is 110 kHz. then the minimum value of M required is________.4
Answer» A low pass analog signal with bandwidth of 20 kHz is sampled at nyquist rate and quantized using a 16-level uniform quantizer. The resultant digital signal is transmitted using M-ary PSK with raised cosine pulse (roll-off factor 0.3) shaping of baseband data. If the channel bandwidth available to transmit the M-ary PSK signal is 110 kHz. then the minimum value of M required is________. 4

Discussion

46.	If the surface shown in the figure is frictionless and the strings are inextensible, then the ratio of tensions T1 and T2 in the string is
Answer» If the surface shown in the figure is frictionless and the strings are inextensible, then the ratio of tensions $T_{1}$ and $T_{2}$ in the string is

Discussion

47.	Two concentric rings, one with radius of 0.5 m and mass 1 kg and other having a radius of 1 m and mass 2 kg are placed together on a horizontal table. Find out net moment of inertia of the system, about an axis perpendicular to their plane and passing through their common centre.
Answer» Two concentric rings, one with radius of $0.5 m$ and mass $1 kg$ and other having a radius of $1 m$ and mass $2 kg$ are placed together on a horizontal table. Find out net moment of inertia of the system, about an axis perpendicular to their plane and passing through their common centre.

Discussion

48.	A table is revolving on its axis at 5 revolutions per second. A sound source of frequency 1000 Hz is fixed on the table at 70 cm from the axis. The minimum frequency heard by a listener standing far away from the table will be (speed of sound =352 m/s)
Answer» A table is revolving on its axis at 5 revolutions per second. A sound source of frequency $1000 Hz$ is fixed on the table at $70 cm$ from the axis. The minimum frequency heard by a listener standing far away from the table will be (speed of sound $= 352 m/s)$

Discussion

49.	position of a particle vary with time x=ae^{-α t_{{{}}_{}}}+be^{β t} then speed of the particl
Answer» position of a particle vary with time x=ae^{-α t_{{{}}_{}}}+be^{β t} then speed of the particl

Discussion

50.	Photons and alpha particle are accelerated through the same potential. The ratio of wavelength is
Answer» Photons and alpha particle are accelerated through the same potential. The ratio of wavelength is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The variation of acceleration due to gravity g with distance d from the centre of the earth is best represented by (R = Earth's radius)

Which of the following is the correct statement regarding the nature of the image formed by a convex mirror (for a real object)?

157. What is the flux through a cube of side 'a' if a point charge q is at one of it's corner?

Question 14Which of the following statement is correct?(a) A person with myopia can see distant objects clearly(b) A person with hypermetropia can see nearby objects clearly(c) A person with myopia can see nearby objects clearly(d) A person with hypermetropia cannot see distant objects clearly

32.Two identical blocks A and B are connected with a spring of spring constant k as shown in figure. If block B is moving rightwards with speed Vo then maximum extension In the spring will be?

A stone is dropped from a height h. It hits the ground with a certain momentum P. If the same stone is drpped from a height 100% more than the previous height, the momentum when it hits the ground will change by

Which of the following may represent electric field lines?

An object is thrown at an angle of 60∘ with the horizontal with kinetic energy K. What will be its kinetic energy at highest point?

A 3 kg ball moving in rightward direction on a horizontal surface with speed 4 m/s collides with a 4 kg ball moving ahead of it, in rightward direction with a speed of 2 m/s. If the coefficient of restitution is 0.6, find the loss in KE due to collision.

61. A diverging lens of focal length 20 cm and a convergingmirror of focal length 10 cm are placed coaxially at aseparation of 5 cm. Where should an object be placed sothat a real image is formed at the object itself?1062

a particle does vertical circular motion with radius r at an instant the velocity of particle is v and the angle made by its wire with vertical is theta and the angle made by its net acceleration from horizontal is alpha find the value of alpha

A sphere of mass M and radius R2 has a concentric cavity of radius R1 as shown in figure. The force F exerted by the sphere on a particle of mass m located at a distance r from the centre of sphere varies as (0≤r≤∞)

a body of mass 2kg is moving along north east direction with speed 2 m/s A force 0.2N is applied on the body due rest for 10 seconds the velocity of the body is

In an inelastic collision of two bodies, which of the following quantities do not change before and after the collision?

A uniform rod of length l and mass m is fixed at the centre. A spring of spring constant k is connected to rod and wall as shown in the figure. The rod is displaced by small angle θ and released. Find time period of oscillation.

In an electromagnetic wave in free space the root mean square value of electric field is 6 . The peak value of magnetic field is

The mean free path for gas molecules with molecular diameter d and number density n is proportional to

Why does bond angle in hydrides decrease on going down the group?

From a battery of potential difference 20 V, current 3 A flows through a wire for 90 min. Find the electrical energy supplied by the battery.

If the potential energy of first orbit is taken to be zeroin hydrogen atom, then kinetic energy of secondorbit will be(1) 3.4 eV (2) 13.6 eV(3) 1.5 eV (4) 7.3 eV

A 3-phase, 5 kW induction motor has a p.f. of 0.75 lagging. A bank of capacitors is connected in delta across the supply terminals and p.f is raised to 0.9 lagging. The kVAR rating of capacitor connected in each phase is ____ kVAR.0.66

57.A convex lens forms a real image 9 cm long on a screen. Without altering the position of the object and the screen, the lens is displaced and we get again a real image 4 cm long on the screen. Then the length of the object is :- (1) 9cm (2) 4cm (3) 6cm (4) 36cm Click here to view details:

If a pushing force making an angle alpha with horizontal is applied on a block of mass m placed on a horizontal table and angle of friction is beta , then minimum magnitude of force required to move the block is

If the two vectors ¯A=2^i+3^j+4^ and ¯B=^i+2^j−n^k are perpendicular, then the value of n is:

Consider a scenario where a bus is moving with a constant speed. A person inside the bus, started pushing the bus from inside. Which of the following statements are true.

two concentric spherical conducting shells of radius r and R (r

In a simple harmonic motion the acceleration-(1) Leads displacement by 180 °(2) Leads velocity by 90 ° (3) Leads velocity by 180 degrees(4) Both (1) & (2)

The disc of mass M with uniform surface mass density σ is shown in the figure. The centre of mass of the quarter disc (the shaded area) is at the position (x3Rπ,x3Rπ), then, x is _______.(Round off to the nearest integer)(R is the radius of disc)

A particle falling from rest under gravity covers height H in 2.828 second. The time taken by it to cover first half of the height is approximately

32 What is meant by x rays defraction and how to find bond length with it

85. water is filled in a tank up to 3 metre height. the base of the tank is at height 1 m above the ground. what should be the height of a hole made in it. so that water can be sprayed up to a maximum horizontal distance.

The resultant magnetic moment of the following arrangement is-

If the position vectors of the points A,B,C,D are (0,2,1),(3,1,1),(−5,3,2),(2,4,1) respectively and if −−→PA+−−→PB+−−→PC+−−→PD=→0, then the position vector of P is

A conducting sphere of radius 10 cm is charged with 10μC. Another uncharged sphere of radius 20 cm is allowed to touch it for some time. After that if the spheres are seperated, then surface charge density on the spheres will be in the ratio of

How many unique solutions does the equation 4x2+4x+1=0 have?

In the Young's double slit experiment using a monochromatic light of wavelength λ, the path difference (in terms of an integer n) corresponding to any point having half the peak intensity is

Two capacitors A and B with capacitances 3 μF and 2 μF are charged to a potential difference of 100 V and 180 V respectively. They are connected to an uncharged 2 μF capacitor C through a switch S as shown. When the switch is pressed, the charge flown in the circuit is

If the surface shown in the figure is frictionless and the strings are inextensible, then the ratio of tensions T1 and T2 in the string is

Two concentric rings, one with radius of 0.5 m and mass 1 kg and other having a radius of 1 m and mass 2 kg are placed together on a horizontal table. Find out net moment of inertia of the system, about an axis perpendicular to their plane and passing through their common centre.

A table is revolving on its axis at 5 revolutions per second. A sound source of frequency 1000 Hz is fixed on the table at 70 cm from the axis. The minimum frequency heard by a listener standing far away from the table will be (speed of sound =352 m/s)

position of a particle vary with time x=ae^{-α t_{{{}}_{}}}+be^{β t} then speed of the particl

Photons and alpha particle are accelerated through the same potential. The ratio of wavelength is