50278 + Interview Questions in Physics

1.	1--- Suppose the ground state radius and velocity of an electron in a Bohr,s atom are r0 and v0 respectively. If hypothetically the mass of electron becomes 200times of its present value then the ground state radius and velocity will be respectively .2 --- The ratio of series limit frequencies of Balmer series to that of Bracket series for a H - like atom is .
Answer» 1--- Suppose the ground state radius and velocity of an electron in a Bohr,s atom are r0 and v0 respectively. If hypothetically the mass of electron becomes 200times of its present value then the ground state radius and velocity will be respectively . 2 --- The ratio of series limit frequencies of Balmer series to that of Bracket series for a H - like atom is .

Discussion

2.	My collage timings are 8-7 and I am at the ending stage of 11th give me time table for JEE advance
Answer» My collage timings are 8-7 and I am at the ending stage of 11th give me time table for JEE advance

Discussion

3.	two particleas are moving in circulat path of radii r1 and r2vwith same angular speed.then the ratio of their centripital accelaration i
Answer» two particleas are moving in circulat path of radii r1 and r2vwith same angular speed.then the ratio of their centripital accelaration i

Discussion

4.	114.Electric potential at a point,r distance away due to a point charge q at point A is V . If twice of this charge is distributed uniformly on the surface of a hollow sphere of radius 4r with centre at a point A the potential at a point now is
Answer» 114.Electric potential at a point,r distance away due to a point charge q at point A is V . If twice of this charge is distributed uniformly on the surface of a hollow sphere of radius 4r with centre at a point A the potential at a point now is

Discussion

5.	A very long charged solid cylinder of radius 'a' contains a uniform charge density ρ. Dielectric constant of the material of the cylinder is k. What will be the magnitude of electric field at a radial distance 'x' (x < a) from the axis of the cylinder?
Answer» A very long charged solid cylinder of radius ' $a$ ' contains a uniform charge density $ρ$ . Dielectric constant of the material of the cylinder is k. What will be the magnitude of electric field at a radial distance ' $x$ ' ( $x$ < $a$ ) from the axis of the cylinder?

Discussion

6.	Two coherent point sources S1 & S2 vibrating in phase emits a light of wavelength λ. The separation between the sources is 2λ. The smallest distance from S2 on a line passing through S2 and perpendicular to S1S2 where a minimum intensity occurs is
Answer» Two coherent point sources $S_{1} & S_{2}$ vibrating in phase emits a light of wavelength $λ .$ The separation between the sources is $2 λ .$ The smallest distance from $S_{2}$ on a line passing through $S_{2}$ and perpendicular to $S_{1} S_{2}$ where a minimum intensity occurs is

Discussion

7.	The resistance of a resistance thermometer has values 2.71 and 3.70 ohm at 10∘C and 100∘C. The temperature at which the resistance is 3.26 ohm is
Answer» The resistance of a resistance thermometer has values 2.71 and 3.70 ohm at $10^{\circ} C a n d 100^{\circ} C$ . The temperature at which the resistance is 3.26 ohm is

Discussion

8.	Is Magnetic field at one end of an infinite solenoid along the axis? If a is the area of cross section of solenoid with I current and n turns per unit length.then what is the flux of mf at the end of an infinite solenoid?
Answer» Is Magnetic field at one end of an infinite solenoid along the axis? If a is the area of cross section of solenoid with I current and n turns per unit length.then what is the flux of mf at the end of an infinite solenoid?

Discussion

9.	A stone is hung in air from a wire which is stretched over a sonometer. The bridges of the sonometer are L cm apart when the wire is in unison with a tuning fork of frequency N. When the stone is completely immersed in water, the length between the bridges is l cm for re-estabilishing the unison. The specific gravity of the material of the stone is
Answer» A stone is hung in air from a wire which is stretched over a sonometer. The bridges of the sonometer are $L c m$ apart when the wire is in unison with a tuning fork of frequency $N$ . When the stone is completely immersed in water, the length between the bridges is $l c m$ for re-estabilishing the unison. The specific gravity of the material of the stone is

Discussion

10.	A small stone of man 0.2 kg tied to a massless inextensible string is rotated in a vertical circle of radius of 2 m. If the particle is just able to complete a vertical circle, what is the speed at the highest point of the circular path? Also, calculate speed if the mass of stone is increased by 50% (Take g=10 m/s2)
Answer» A small stone of man $0.2 kg$ tied to a massless inextensible string is rotated in a vertical circle of radius of $2 m$ . If the particle is just able to complete a vertical circle, what is the speed at the highest point of the circular path? Also, calculate speed if the mass of stone is increased by $50$ % (Take $g = 10 m / s^{2})$

Discussion

11.	For an emf of 4 V, the resistance of the solenoid is 50 Ω. It has 5000 turns for 20 cm of total length. Calculate the value of magnetic field strength in this case.
Answer» For an emf of $4 V$ , the resistance of the solenoid is $50 Ω$ . It has $5000 turns$ for $20 cm$ of total length. Calculate the value of magnetic field strength in this case.

Discussion

12.	(a) Obtainan expression for the mutual inductance between a long straight wireand a square loop of side a asshown in Fig. 6.21.(b) Nowassume that the straight wire carries a current of 50 A and the loopis moved to the right with a constant velocity, v= 10 m/s.Calculatethe induced emf in the loop at the instant when x= 0.2 m.Takea =0.1 m and assume that the loop has a large resistance.
Answer» (a) Obtain an expression for the mutual inductance between a long straight wire and a square loop of side a as shown in Fig. 6.21. (b) Now assume that the straight wire carries a current of 50 A and the loop is moved to the right with a constant velocity, v = 10 m/s. Calculate the induced emf in the loop at the instant when x = 0.2 m. Take a = 0.1 m and assume that the loop has a large resistance.

12.

(a) Obtainan expression for the mutual inductance between a long straight wireand a square loop of side a asshown in Fig. 6.21.(b) Nowassume that the straight wire carries a current of 50 A and the loopis moved to the right with a constant velocity, v= 10 m/s.Calculatethe induced emf in the loop at the instant when x= 0.2 m.Takea =0.1 m and assume that the loop has a large resistance.

Answer»

(a) Obtain
an expression for the mutual inductance between a long straight wire
and a square loop of side a as
shown in Fig. 6.21.

(b) Now
assume that the straight wire carries a current of 50 A and the loop
is moved to the right with a constant velocity, v
= 10 m/s.

Calculate
the induced emf in the loop at the instant when x
= 0.2 m.

Take
a =
0.1 m and assume that the loop has a large resistance.

Discussion

13.	A current of 30A is registered when terminal of cell of emf 1.5 volts are connected through an ammeter .The heat produced in 10s is
Answer» A current of 30A is registered when terminal of cell of emf 1.5 volts are connected through an ammeter .The heat produced in 10s is

Discussion

14.	Two coherent light souces A and B are at a dis†an ce 2λ from each other,where λ is wavelength. The dis†an ce from A on x-axisa at which first constructive interference is obtained- 1. λ 2. 1.5λ 3. 3λ 4. 4λ
Answer» Two coherent light souces A and B are at a dis†an ce 2λ from each other,where λ is wavelength. The dis†an ce from A on x-axisa at which first constructive interference is obtained- 1. λ 2. 1.5λ 3. 3λ 4. 4λ

Discussion

15.	When a moving bus stops immediately , you feel a push forward. Who pushed you?
Answer» When a moving bus stops immediately , you feel a push forward. Who pushed you?

Discussion

16.	A boat has Red light of wavelength λ = 800nm on the mast. What wavelength would be mea sured and what colour would be seen for this light by a diver submerged in water? Given n_w= 4/3
Answer» A boat has Red light of wavelength λ = 800nm on the mast. What wavelength would be mea sured and what colour would be seen for this light by a diver submerged in water? Given n_w= 4/3

Discussion

17.	The full deflection current of moving coil galvanometer is 1 mA. If it is converted into an ammeter of 10 A range then value of shunt is [ Resistance of Galvanometer= 10^3 ohms]
Answer» The full deflection current of moving coil galvanometer is 1 mA. If it is converted into an ammeter of 10 A range then value of shunt is [ Resistance of Galvanometer= 10^3 ohms]

Discussion

18.	A body of mass 3 kg is under a force, which causes a displacement in it given by S=S=2t33 (in m). Find the work done by the force in first 2 seconds
Answer» A body of mass 3 kg is under a force, which causes a displacement in it given by $S = S = \frac{2 t^{3}}{3}$ (in m). Find the work done by the force in first 2 seconds

Discussion

19.	8. During removal of electron as of fe2+ ion we remove ions from last by arranging 3d before 4p and then remove or without atranging
Answer» 8. During removal of electron as of fe2+ ion we remove ions from last by arranging 3d before 4p and then remove or without atranging

Discussion

20.	Consider a conducting spherical shell of radius R with its center at the origin, carrying uniform positive surface charge density. The variation of the magnitude of the electric field \|→E(r)\| and the electric potential V(r) with the distance r from the center, is best represented by the graph(Here dotted line represents potential curve and bold line represents electric field curve):
Answer» Consider a conducting spherical shell of radius $R$ with its center at the origin, carrying uniform positive surface charge density. The variation of the magnitude of the electric field $\| \to E (r) \|$ and the electric potential $V (r)$ with the distance $r$ from the center, is best represented by the graph (Here dotted line represents potential curve and bold line represents electric field curve):

Discussion

21.	The temperature of the two outer surfaces of a composite slab, consisting of two materials having coefficients of thermal conductivities K and 2K, and thickness x and 4x respectively are T2 and T1(T2>T1) as shown in figure. The cross-sectional area of the slab is A. The rate of heat transfer through the slab in a steady state is [A(T2−T1)Kfx], where f is equal to
Answer» The temperature of the two outer surfaces of a composite slab, consisting of two materials having coefficients of thermal conductivities $K$ and $2 K$ , and thickness $x$ and $4 x$ respectively are $T_{2}$ and $T_{1} (T_{2} > T_{1})$ as shown in figure. The cross-sectional area of the slab is $A$ . The rate of heat transfer through the slab in a steady state is $[\frac{A (T_{2} - T_{1}) K}{f x}]$ , where $f$ is equal to

Discussion

22.	A bat emits ultrasonic sound of frequency 100 kHz in air. If the sound gets reflected (without transmission and loss of energy) from a water surface then wavelength of the reflected sound is[speed of sound in air is 340 ms−1]
Answer» A bat emits ultrasonic sound of frequency $100 kHz$ in air. If the sound gets reflected (without transmission and loss of energy) from a water surface then wavelength of the reflected sound is [speed of sound in air is $340 {ms}^{- 1}$ ]

Discussion

23.	How density can be an intensive property?
Answer» How density can be an intensive property?

Discussion

24.	The value of γ=CPCV is 43 for an adiabatic process of an ideal gas for which the internal energy is given by dU=n(VdP+PdV). The value of n is
Answer» The value of $γ = \frac{C_{P}}{C_{V}}$ is $\frac{4}{3}$ for an adiabatic process of an ideal gas for which the internal energy is given by $d U = n (V d P + P d V)$ . The value of $n$ is

Discussion

25.	In Young's double- slit experiment, slits are separated by 0.5 mm and the screen is placed 150 cm away. A beam of light consisting of two wavelengths, 650 nm and 520 nm, is used to obtain interference fringes on the screen. The least distance from the common central maximum to the point where the bright fringes due to both the wavelengths coincide are
Answer» In Young's double- slit experiment, slits are separated by $0.5 mm$ and the screen is placed $150 cm$ away. A beam of light consisting of two wavelengths, $650 nm$ and $520 nm$ , is used to obtain interference fringes on the screen. The least distance from the common central maximum to the point where the bright fringes due to both the wavelengths coincide are

Discussion

26.	How much energy is required to move a stationary body of mass m from an orbit of radius 2R to 4R?
Answer» How much energy is required to move a stationary body of mass m from an orbit of radius 2R to 4R?

Discussion

27.	If O is the center of a ring of radius r, then find the potential at point O due to half ring that has a linear charge density λ.
Answer» If $O$ is the center of a ring of radius $r$ , then find the potential at point $O$ due to half ring that has a linear charge density $λ$ .

Discussion

28.	Two charged particles having masses in the ratio 2:3 and charges in the ratio 1:2 are released from rest in a unifrom electric field. After 1 minute, the their K.E will be in the ratio of
Answer» Two charged particles having masses in the ratio $2 : 3$ and charges in the ratio $1 : 2$ are released from rest in a unifrom electric field. After $1$ minute, the their $K . E$ will be in the ratio of

Discussion

29.	Two plane mirrors are inclined to each other with an angle of 40 degree find the net angle of deviation and the number of reflection?
Answer» Two plane mirrors are inclined to each other with an angle of 40 degree find the net angle of deviation and the number of reflection?

Discussion

30.	A particle starts from the point (0,8) m and moves with uniform velocity of 3ˆi m/sec. After 5 sec, the angular velocity of the particle about the origin will be
Answer» A particle starts from the point $(0, 8) m$ and moves with uniform velocity of $3 ˆ i$ $m / s e c$ . After $5 s e c$ , the angular velocity of the particle about the origin will be

Discussion

31.	1.At what separation should 2 equal charges 1C each,be placed so that the force between them equals the weight of a 50 kg person?
Answer» 1.At what separation should 2 equal charges 1C each,be placed so that the force between them equals the weight of a 50 kg person?

Discussion

32.	A ball is projected with velocity u,at an angle B(beta) to the horizontal towards a smooth wall which approach the ball with velocity v.Find the time of impact.(a)(cos(B)+2v)/(g(4cos(B)+v)) (b)((u cos(B)+2v)u sin(B))/(g(u cos(B)+v))(c)(2vusin(B))/g(u cos(B)+v) (c)((u cos(B)+2v)u sin(B))/g(g is the acceleration due to gravity.)
Answer» A ball is projected with velocity u,at an angle B(beta) to the horizontal towards a smooth wall which approach the ball with velocity v.Find the time of impact. (a)(cos(B)+2v)/(g(4cos(B)+v)) (b)((u cos(B)+2v)u sin(B))/(g(u cos(B)+v)) (c)(2vusin(B))/g(u cos(B)+v) (c)((u cos(B)+2v)u sin(B))/g (g is the acceleration due to gravity.)

Discussion

33.	An object is said to be in a state of free fall when
Answer» An object is said to be in a state of free fall when

Discussion

34.	A uniform cylinder of length L and mass M having cross-sectional area A is suspended, with its length vertical, from a fixed point by a massless spring, such that it is half-submerged in a liquid of density ρ at equilibrium position. When the cylinder is given a small downward push and released it starts oscillating vertically with a small amplitude. If the force constant of the spring is k, the frequency of oscillation of the cylinder is :
Answer» A uniform cylinder of length L and mass M having cross-sectional area A is suspended, with its length vertical, from a fixed point by a massless spring, such that it is half-submerged in a liquid of density $ρ$ at equilibrium position. When the cylinder is given a small downward push and released it starts oscillating vertically with a small amplitude. If the force constant of the spring is k, the frequency of oscillation of the cylinder is :

Discussion

35.	Which of the following figure represents the variation of particle's momentum and its associated de-Broglie wavelength
Answer» Which of the following figure represents the variation of particle's momentum and its associated de-Broglie wavelength

Discussion

36.	a man pull a bucket full of water from h metre deep well. if the mass of rope is m and mass of bucket full of water is M , tgen work done by the man is
Answer» a man pull a bucket full of water from h metre deep well. if the mass of rope is m and mass of bucket full of water is M , tgen work done by the man is

Discussion

37.	What is the correct order of polarising power
Answer» What is the correct order of polarising power

Discussion

38.	27 drop of same size are charged at 220 volt each they coalesce to form of bigger drop calculate the potential of the bigger drop
Answer» 27 drop of same size are charged at 220 volt each they coalesce to form of bigger drop calculate the potential of the bigger drop

Discussion

39.	The retarding acceleration of 7.35 ms−2 due to frictional force stops the car of mass 400 kg travelling on a road. The coefficient of friction between the tyre of the car and the road is
Answer» The retarding acceleration of $7.35 {ms}^{- 2}$ due to frictional force stops the car of mass $400 kg$ travelling on a road. The coefficient of friction between the tyre of the car and the road is

Discussion

40.	Why is superposition in quantum mechanics?
Answer» Why is superposition in quantum mechanics?

Discussion

41.	Four metal plates numbered 1, 2, 3 and 4 are arranged as shown in Fig. The area of each plate is A and the separation between adjacent paltes is d. The capacitance of the arrangement is
Answer» Four metal plates numbered 1, 2, 3 and 4 are arranged as shown in Fig. The area of each plate is A and the separation between adjacent paltes is d. The capacitance of the arrangement is

Discussion

42.	A circular metallic rod of length 250 mm is placed between two rigid immovable walls as shown in the figure. The rod is in perfect contact with the wall on the left side and there is a gap of 0.2 mm between the rod and the wall on the right side. If the temperature of the rod is increased by 200∘c, then the axial stress developed in the rod is MPa. Young's modulus of the material of the rod is 200 GPa and the coefficient of thermal expansion is 10−5per∘C.240
Answer» A circular metallic rod of length 250 mm is placed between two rigid immovable walls as shown in the figure. The rod is in perfect contact with the wall on the left side and there is a gap of 0.2 mm between the rod and the wall on the right side. If the temperature of the rod is increased by $200^{\circ} c$ , then the axial stress developed in the rod is MPa. Young's modulus of the material of the rod is 200 GPa and the coefficient of thermal expansion is $10^{- 5} {per}^{\circ} C$ . 240

42.

A circular metallic rod of length 250 mm is placed between two rigid immovable walls as shown in the figure. The rod is in perfect contact with the wall on the left side and there is a gap of 0.2 mm between the rod and the wall on the right side. If the temperature of the rod is increased by 200∘c, then the axial stress developed in the rod is MPa. Young's modulus of the material of the rod is 200 GPa and the coefficient of thermal expansion is 10−5per∘C.240

Answer»

A circular metallic rod of length 250 mm is placed between two rigid immovable walls as shown in the figure. The rod is in perfect contact with the wall on the left side and there is a gap of 0.2 mm between the rod and the wall on the right side. If the temperature of the rod is increased by $200^{\circ} c$ , then the axial stress developed in the rod is MPa. Young's modulus of the material of the rod is 200 GPa and the coefficient of thermal expansion is $10^{- 5} {per}^{\circ} C$ .

240

Discussion

43.	What is the angle of banking necessary for a curved frictionless road of radius 30 m for safe driving at a speed of 20 m/s? (Consider value of g=10 m/s2)
Answer» What is the angle of banking necessary for a curved frictionless road of radius $30 m$ for safe driving at a speed of $20 m/s$ ? (Consider value of $g = 10 {m/s}^{2}$ )

Discussion

44.	The root mean square speed of hydrogen molecules of an ideal hydrogen gas kept in a gas chamber at 0∘C is 3180 metres/second. The pressure on the hydrogen gas is (Density of hydrogen gas is 8.99×10−2 kg/m3, 1 atmosphere = ( 1.01×105 N/m2 )
Answer» The root mean square speed of hydrogen molecules of an ideal hydrogen gas kept in a gas chamber at $0^{\circ} C$ is 3180 metres/second. The pressure on the hydrogen gas is (Density of hydrogen gas is $8.99 \times 10^{- 2} k g / m^{3}$ , 1 atmosphere = ( $1.01 \times 10^{5} N / m^{2}$ )

44.

The root mean square speed of hydrogen molecules of an ideal hydrogen gas kept in a gas chamber at 0∘C is 3180 metres/second. The pressure on the hydrogen gas is (Density of hydrogen gas is 8.99×10−2 kg/m3, 1 atmosphere = ( 1.01×105 N/m2 )

Answer»

The root mean square speed of hydrogen molecules of an ideal hydrogen gas kept in a gas chamber at $0^{\circ} C$ is 3180 metres/second. The pressure on the hydrogen gas is (Density of hydrogen gas is $8.99 \times 10^{- 2} k g / m^{3}$ , 1 atmosphere = ( $1.01 \times 10^{5} N / m^{2}$ )

Discussion

45.	Consider a gravity-free hall in which an experimenter of mass 50 kg is resting on a 5 kg pillow, 8 ft above the floor of the hall. He pushes the pillow down so that it starts falling at a speed of 8 ft/s. The pillow makes a perfectly elastic collision with the floor, rebounds and reaches the experimenter's head. Find the time elapsed in the process.
Answer» Consider a gravity-free hall in which an experimenter of mass 50 kg is resting on a 5 kg pillow, 8 ft above the floor of the hall. He pushes the pillow down so that it starts falling at a speed of 8 ft/s. The pillow makes a perfectly elastic collision with the floor, rebounds and reaches the experimenter's head. Find the time elapsed in the process.

Discussion

46.	A source emitting sound of frequency 180 Hz is placed in front of a wall at a distance of 2 m from it. A detector is also placed in front of the wall at the same distance from it. Find the minimum distance between the source and the detector for which the detector detects a maximum of sound. Speed of sound in air = 360 ms−1
Answer» A source emitting sound of frequency 180 Hz is placed in front of a wall at a distance of 2 m from it. A detector is also placed in front of the wall at the same distance from it. Find the minimum distance between the source and the detector for which the detector detects a maximum of sound. Speed of sound in air = 360 $m s^{- 1}$

46.

A source emitting sound of frequency 180 Hz is placed in front of a wall at a distance of 2 m from it. A detector is also placed in front of the wall at the same distance from it. Find the minimum distance between the source and the detector for which the detector detects a maximum of sound. Speed of sound in air = 360 ms−1

Answer»

A source emitting sound of frequency 180 Hz is placed in front of a wall at a distance of 2 m from it. A detector is also placed in front of the wall at the same distance from it. Find the minimum distance between the source and the detector for which the detector detects a maximum of sound. Speed of sound in air = 360 $m s^{- 1}$

Discussion

47.	force versus displacement curve is shown in the diagram. the work done by the force at the end of displacement 40m is
Answer» force versus displacement curve is shown in the diagram. the work done by the force at the end of displacement 40m is

Discussion

48.	If a stone is thrown with a speed v0 at an angle θ0 with horizontal, find the velocity of the stone when its line of motion makes an angle θ with horizontal.
Answer» If a stone is thrown with a speed $v_{0}$ at an angle $θ_{0}$ with horizontal, find the velocity of the stone when its line of motion makes an angle $θ$ with horizontal.

48.

If a stone is thrown with a speed v0 at an angle θ0 with horizontal, find the velocity of the stone when its line of motion makes an angle θ with horizontal.

Answer»

If a stone is thrown with a speed $v_{0}$ at an angle $θ_{0}$ with horizontal, find the velocity of the stone when its line of motion makes an angle $θ$ with horizontal.

Discussion

49.	A charged particleof mass m having charge q remains in equillibirium at height d above a fixed charge Q. Now the charged particle is slighly displaced along the line joining the charges, show that it will execute S.H.M. and find the time period of oscillation.
Answer» A charged particleof mass m having charge q remains in equillibirium at height d above a fixed charge Q. Now the charged particle is slighly displaced along the line joining the charges, show that it will execute S.H.M. and find the time period of oscillation.

Discussion

50.	What is relative velocity ? On what factors does it depend ? Can the relative velocity of two bodies be greater than the absolute velocity of either body ?
Answer» What is relative velocity ? On what factors does it depend ? Can the relative velocity of two bodies be greater than the absolute velocity of either body ?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

My collage timings are 8-7 and I am at the ending stage of 11th give me time table for JEE advance

two particleas are moving in circulat path of radii r1 and r2vwith same angular speed.then the ratio of their centripital accelaration i

114.Electric potential at a point,r distance away due to a point charge q at point A is V . If twice of this charge is distributed uniformly on the surface of a hollow sphere of radius 4r with centre at a point A the potential at a point now is

A very long charged solid cylinder of radius 'a' contains a uniform charge density ρ. Dielectric constant of the material of the cylinder is k. What will be the magnitude of electric field at a radial distance 'x' (x &lt; a) from the axis of the cylinder?

Two coherent point sources S1 &amp; S2 vibrating in phase emits a light of wavelength λ. The separation between the sources is 2λ. The smallest distance from S2 on a line passing through S2 and perpendicular to S1S2 where a minimum intensity occurs is

The resistance of a resistance thermometer has values 2.71 and 3.70 ohm at 10∘C and 100∘C. The temperature at which the resistance is 3.26 ohm is

Is Magnetic field at one end of an infinite solenoid along the axis? If a is the area of cross section of solenoid with I current and n turns per unit length.then what is the flux of mf at the end of an infinite solenoid?

For an emf of 4 V, the resistance of the solenoid is 50 Ω. It has 5000 turns for 20 cm of total length. Calculate the value of magnetic field strength in this case.

A current of 30A is registered when terminal of cell of emf 1.5 volts are connected through an ammeter .The heat produced in 10s is

Two coherent light souces A and B are at a dis†an ce 2λ from each other,where λ is wavelength. The dis†an ce from A on x-axisa at which first constructive interference is obtained- 1. λ 2. 1.5λ 3. 3λ 4. 4λ

When a moving bus stops immediately , you feel a push forward. Who pushed you?

A boat has Red light of wavelength λ = 800nm on the mast. What wavelength would be mea sured and what colour would be seen for this light by a diver submerged in water? Given n_w= 4/3

The full deflection current of moving coil galvanometer is 1 mA. If it is converted into an ammeter of 10 A range then value of shunt is [ Resistance of Galvanometer= 10^3 ohms]

A body of mass 3 kg is under a force, which causes a displacement in it given by S=S=2t33 (in m). Find the work done by the force in first 2 seconds

8. During removal of electron as of fe2+ ion we remove ions from last by arranging 3d before 4p and then remove or without atranging

A bat emits ultrasonic sound of frequency 100 kHz in air. If the sound gets reflected (without transmission and loss of energy) from a water surface then wavelength of the reflected sound is[speed of sound in air is 340 ms−1]

How density can be an intensive property?

The value of γ=CPCV is 43 for an adiabatic process of an ideal gas for which the internal energy is given by dU=n(VdP+PdV). The value of n is

How much energy is required to move a stationary body of mass m from an orbit of radius 2R to 4R?

If O is the center of a ring of radius r, then find the potential at point O due to half ring that has a linear charge density λ.

Two charged particles having masses in the ratio 2:3 and charges in the ratio 1:2 are released from rest in a unifrom electric field. After 1 minute, the their K.E will be in the ratio of

Two plane mirrors are inclined to each other with an angle of 40 degree find the net angle of deviation and the number of reflection?

A particle starts from the point (0,8) m and moves with uniform velocity of 3ˆi m/sec. After 5 sec, the angular velocity of the particle about the origin will be

1.At what separation should 2 equal charges 1C each,be placed so that the force between them equals the weight of a 50 kg person?

An object is said to be in a state of free fall when

Which of the following figure represents the variation of particle's momentum and its associated de-Broglie wavelength

a man pull a bucket full of water from h metre deep well. if the mass of rope is m and mass of bucket full of water is M , tgen work done by the man is

What is the correct order of polarising power

27 drop of same size are charged at 220 volt each they coalesce to form of bigger drop calculate the potential of the bigger drop

The retarding acceleration of 7.35 ms−2 due to frictional force stops the car of mass 400 kg travelling on a road. The coefficient of friction between the tyre of the car and the road is

Why is superposition in quantum mechanics?

Four metal plates numbered 1, 2, 3 and 4 are arranged as shown in Fig. The area of each plate is A and the separation between adjacent paltes is d. The capacitance of the arrangement is

What is the angle of banking necessary for a curved frictionless road of radius 30 m for safe driving at a speed of 20 m/s? (Consider value of g=10 m/s2)

The root mean square speed of hydrogen molecules of an ideal hydrogen gas kept in a gas chamber at 0∘C is 3180 metres/second. The pressure on the hydrogen gas is (Density of hydrogen gas is 8.99×10−2 kg/m3, 1 atmosphere = ( 1.01×105 N/m2 )

force versus displacement curve is shown in the diagram. the work done by the force at the end of displacement 40m is

If a stone is thrown with a speed v0 at an angle θ0 with horizontal, find the velocity of the stone when its line of motion makes an angle θ with horizontal.

A charged particleof mass m having charge q remains in equillibirium at height d above a fixed charge Q. Now the charged particle is slighly displaced along the line joining the charges, show that it will execute S.H.M. and find the time period of oscillation.

What is relative velocity ? On what factors does it depend ? Can the relative velocity of two bodies be greater than the absolute velocity of either body ?

A very long charged solid cylinder of radius 'a' contains a uniform charge density ρ. Dielectric constant of the material of the cylinder is k. What will be the magnitude of electric field at a radial distance 'x' (x < a) from the axis of the cylinder?

Two coherent point sources S1 & S2 vibrating in phase emits a light of wavelength λ. The separation between the sources is 2λ. The smallest distance from S2 on a line passing through S2 and perpendicular to S1S2 where a minimum intensity occurs is