50278 + Interview Questions in Physics

1.	A 5V battery with internal resistance 2Ω and a 2V battery with internal resistance 1Ω are connected to a 10Ω resistor as shown in figure. The current in the 10Ω resistor is
Answer» A 5V battery with internal resistance 2 $Ω$ and a 2V battery with internal resistance 1 $Ω$ are connected to a 10 $Ω$ resistor as shown in figure. The current in the 10 $Ω$ resistor is

1.

A 5V battery with internal resistance 2Ω and a 2V battery with internal resistance 1Ω are connected to a 10Ω resistor as shown in figure. The current in the 10Ω resistor is

Answer»

A 5V battery with internal resistance 2 $Ω$ and a 2V battery with internal resistance 1 $Ω$ are connected to a 10 $Ω$ resistor as shown in figure.

The current in the 10 $Ω$ resistor is

Discussion

2.	Define velocity.
Answer» Define velocity.

Discussion

3.	The saturation vapour pressure of water at 100o C is
Answer» The saturation vapour pressure of water at $100^{o} C$ is

Discussion

4.	In the finite network shown in the figure, C1=8μF and C=12μF. The equivalent capacitance between points P and Q is :
Answer» In the finite network shown in the figure, $C_{1} = 8 μ F$ and $C = 12 μ F$ . The equivalent capacitance between points P and Q is :

4.

In the finite network shown in the figure, C1=8μF and C=12μF. The equivalent capacitance between points P and Q is :

Answer»

In the finite network shown in the figure, $C_{1} = 8 μ F$ and $C = 12 μ F$ . The equivalent capacitance between points P and Q is :

Discussion

5.	A star is moving towards the earth with a speed of 4.5×106 m/s. If the true wavelength of a certain line in the spectrum received from the star is 5890 ∘A, its apparent wavelength will be about _____. [C=3×108 m/s]. Ignore the relativistic effects.
Answer» A star is moving towards the earth with a speed of $4.5 \times 10^{6} m / s$ . If the true wavelength of a certain line in the spectrum received from the star is $5890 \circ A$ , its apparent wavelength will be about _____. $[C = 3 \times 10^{8} m / s]$ . Ignore the relativistic effects.

Discussion

6.	A rod AB of length L and mass M is free to move on a frictionless horizontal surface is moving with a velocity v as shown in fig. End B of rod AB strikes end of wall. Assuming elastic impact, angular velocity of rod AB just after impact is
Answer» A rod AB of length L and mass M is free to move on a frictionless horizontal surface is moving with a velocity v as shown in fig. End B of rod AB strikes end of wall. Assuming elastic impact, angular velocity of rod AB just after impact is

6.

A rod AB of length L and mass M is free to move on a frictionless horizontal surface is moving with a velocity v as shown in fig. End B of rod AB strikes end of wall. Assuming elastic impact, angular velocity of rod AB just after impact is

Answer»

A rod AB of length L and mass M is free to move on a frictionless horizontal surface is moving with a velocity v as shown in fig. End B of rod AB strikes end of wall. Assuming elastic impact, angular velocity of rod AB just after impact is

Discussion

7.	One mole of an ideal diatomic gas is taken through the cycle as shown in the figure. 1→2 : Isochoric process 2→3 : Straight line on P-V diagram 3→1 : Isobaric process The average molecular speed of the gas in the states 1,2 and 3 are in the ratio
Answer» One mole of an ideal diatomic gas is taken through the cycle as shown in the figure. $1 \to 2$ : Isochoric process $2 \to 3$ : Straight line on P-V diagram $3 \to 1$ : Isobaric process The average molecular speed of the gas in the states $1, 2$ and $3$ are in the ratio

Discussion

8.	What are vectors?
Answer» What are vectors?

Discussion

9.	A transverse wave is travelling along a string from left to right. The figure below represents the shape of the string at a given instant. At this instant, among the following, choose the wrong statement
Answer» A transverse wave is travelling along a string from left to right. The figure below represents the shape of the string at a given instant. At this instant, among the following, choose the wrong statement

9.

A transverse wave is travelling along a string from left to right. The figure below represents the shape of the string at a given instant. At this instant, among the following, choose the wrong statement

Answer»

A transverse wave is travelling along a string from left to right. The figure below represents the shape of the string at a given instant. At this instant, among the following, choose the wrong statement

Discussion

10.	A steel wire is hanged vertically. What should be its maximum length so that it does not break by its own weight?
Answer» A steel wire is hanged vertically. What should be its maximum length so that it does not break by its own weight?

Discussion

11.	If the net force acting on a closed loop is zero then how can a torque act on it??? Moving coil galvanometer has a closed rectangular loop ...still it rotates in uniform magnetic field
Answer» If the net force acting on a closed loop is zero then how can a torque act on it??? Moving coil galvanometer has a closed rectangular loop ...still it rotates in uniform magnetic field

Discussion

12.	A hammer of weight 2 kg, moving with velocity 8 m/s, strikes against the head of a spike, and drives it into a block of wood. If hammer comes to rest in 0.02 sec, the impule associated with the spike will be:
Answer» A hammer of weight $2 kg$ , moving with velocity $8 m/s$ , strikes against the head of a spike, and drives it into a block of wood. If hammer comes to rest in $0.02 sec$ , the impule associated with the spike will be:

Discussion

13.	A particle moves in a straight line with retardation proportional to square of its displacement. Its loss of kinetic energy for any displacement ‘x’ is proportional to
Answer» A particle moves in a straight line with retardation proportional to square of its displacement. Its loss of kinetic energy for any displacement ‘x’ is proportional to

Discussion

14.	The momentum of a photon is 3.3 × 10−29 kg - m/sec. Its frequency will be
Answer» The momentum of a photon is 3.3 $\times 10^{- 29}$ kg - m/sec. Its frequency will be

Discussion

15.	Which of the following is the unit vector perpendicular to →A and →B
Answer» Which of the following is the unit vector perpendicular to $\to A and \to B$

Discussion

16.	(i) State Malus's Law. (ii) Draw a graph showing the variation of intensity (I) of polarised light transmitted by an analyser with angle (θ) between polariser and analyser. (iii) What is the value of refractive index of a medium of polarising angle 60∘ ?
Answer» (i) State Malus's Law. (ii) Draw a graph showing the variation of intensity (I) of polarised light transmitted by an analyser with angle $(θ)$ between polariser and analyser. (iii) What is the value of refractive index of a medium of polarising angle $60^{\circ}$ ?

Discussion

17.	An infinitely long rod lies along the axis of a concave mirror of focal length f. The near end of the rod is at a distance u > f from the mirror. Its image will have a length
Answer» An infinitely long rod lies along the axis of a concave mirror of focal length f. The near end of the rod is at a distance u > f from the mirror. Its image will have a length

Discussion

18.	A block of mass 4 kg is given velocity 4√2 m/s at the bottom of incline plane of angle 37∘ with horizontal. Coefficient of friction between plane and block is x4 where x is distance from bottom of plane. Distance after which block stops on plane is [g = 10 m/s2 ]
Answer» A block of mass 4 kg is given velocity $4 \sqrt{2}$ m/s at the bottom of incline plane of angle $37^{\circ}$ with horizontal. Coefficient of friction between plane and block is $\frac{x}{4}$ where $x$ is distance from bottom of plane. Distance after which block stops on plane is [g = 10 m/s $^{2}$ ]

Discussion

19.	What is the ratio of the number of people who did not vote to the number of people who voted for the party in 2000?
Answer» What is the ratio of the number of people who did not vote to the number of people who voted for the party in 2000?

Discussion

20.	Two blocks of masses 1 kg and 2 kg are connected by a metal wire going over a smooth pulley as shown in figure. The breaking sress of the metal is 2×10−9N m−2. What should be the minimum radius of the wire used if it is not to break? Take g=10m s−2.
Answer» Two blocks of masses 1 kg and 2 kg are connected by a metal wire going over a smooth pulley as shown in figure. The breaking sress of the metal is $2 \times 10^{- 9} N m^{- 2} .$ What should be the minimum radius of the wire used if it is not to break? Take $g = 10 m s^{- 2} .$

Discussion

21.	50 cal of heat should be supplied to take a system from the state A to the state B through the path ACB as shown in figure. Find the quantity of heat to be supplied to take it from A to B via ADB.
Answer» 50 cal of heat should be supplied to take a system from the state A to the state B through the path ACB as shown in figure. Find the quantity of heat to be supplied to take it from A to B via ADB.

21.

50 cal of heat should be supplied to take a system from the state A to the state B through the path ACB as shown in figure. Find the quantity of heat to be supplied to take it from A to B via ADB.

Answer»

50 cal of heat should be supplied to take a system from the state A to the state B through the path ACB as shown in figure. Find the quantity of heat to be supplied to take it from A to B via ADB.

Discussion

22.	Find the radius and energy of a He+ ion in the states (a) n = 1, b) n = 4 and (c) n = 10
Answer» Find the radius and energy of a $H e^{+}$ ion in the states (a) n = 1, b) n = 4 and (c) n = 10

22.

Find the radius and energy of a He+ ion in the states (a) n = 1, b) n = 4 and (c) n = 10

Answer»

Find the radius and energy of a $H e^{+}$ ion in the states

(a) n = 1,

b) n = 4 and

(c) n = 10

Discussion

23.	The minimum horizontal acceleration (in ms−2) of the container filled with water upto height of 2 m as shown, so that the pressure at point A of the container becomes atmospheric is (the tank is of sufficient height)
Answer» The minimum horizontal acceleration (in ${ms}^{- 2}$ ) of the container filled with water upto height of $2 m$ as shown, so that the pressure at point $A$ of the container becomes atmospheric is (the tank is of sufficient height)

Discussion

24.	The elevator shown in fig. is descending with an acceleration of 2 m/s2. The mass of the block A=0.5 kg and that of B=1 kg. The force exerted by the block A on block B is
Answer» The elevator shown in fig. is descending with an acceleration of $2 {m/s}^{2}$ . The mass of the block $A = 0.5 kg$ and that of $B = 1 kg$ . The force exerted by the block $A$ on block $B$ is

Discussion

25.	The figure shows the velocity and acceleration of a point like body at the initial moment of its motion. The acceleration vector of the body remains constant. The minimum radius of curvature of trajectory of the body is (in m upto two decimals.)
Answer» The figure shows the velocity and acceleration of a point like body at the initial moment of its motion. The acceleration vector of the body remains constant. The minimum radius of curvature of trajectory of the body is (in $m$ upto two decimals.)

Discussion

26.	A fisherman notices that his boat is moving up and down periodically, owing to waves on the surface of the water. It takes 2.5 s for the boat to travel from its highest point to its lowest a total distance of 0.62m. The fisherman sees that the wave crests are spaced 6.0 m apart. What would be the equation of such a wave?
Answer» A fisherman notices that his boat is moving up and down periodically, owing to waves on the surface of the water. It takes 2.5 s for the boat to travel from its highest point to its lowest a total distance of 0.62m. The fisherman sees that the wave crests are spaced 6.0 m apart. What would be the equation of such a wave?

Discussion

27.	A long circular tube of length 10 m and radius 0.3 m carries a current I along its curved surface as shown. A wire-loop of resistance 0.005 ohm and of radius 0.1 m is placed inside the tube with its axis coinciding with the axis of the tube. The current varies as I=I0cos(300t) where I0 is constant. If the magnetic moment of the loop is Nμ0I0sin(300t), then ′N′ is
Answer» A long circular tube of length 10 $m$ and radius 0.3 $m$ carries a current $I$ along its curved surface as shown. A wire-loop of resistance 0.005 ohm and of radius 0.1 $m$ is placed inside the tube with its axis coinciding with the axis of the tube. The current varies as $I = I_{0} cos (300 t)$ where $I_{0}$ is constant. If the magnetic moment of the loop is $N μ_{0} I_{0} sin (300 t),$ then $^{'} N^{'}$ is

Discussion

28.	Two waves are passing through a region in the same direction at the same time. If the equation of these waves are y1=αsin2πλ(vt−x) and y2=βsin2πλ[(vt−x)+ϕ], then the amplitude of the resultant wave at ϕ=λ2 is
Answer» Two waves are passing through a region in the same direction at the same time. If the equation of these waves are $y_{1} = α sin \frac{2 π}{λ} (v t - x)$ and $y_{2} = β sin \frac{2 π}{λ} [(v t - x) + ϕ]$ , then the amplitude of the resultant wave at $ϕ = \frac{λ}{2}$ is

Discussion

29.	A plank of mass 10 kg and length L is placed on a frictionless surface. A block of mass 2 kg and negligible size is placed on the plank. Coefficient of friction between the plank and the block is μ=0.2. The block is given sudden horizontal velocity of 2 m/s over the plank. Minimum value of L in meter so that the block does not fall from the plank is [g=10m/s2] (Write upto two digits after the decimal point.)
Answer» A plank of mass 10 kg and length L is placed on a frictionless surface. A block of mass 2 kg and negligible size is placed on the plank. Coefficient of friction between the plank and the block is $μ = 0.2$ . The block is given sudden horizontal velocity of 2 m/s over the plank. Minimum value of L in meter so that the block does not fall from the plank is $[g = 10 m / s^{2}]$ (Write upto two digits after the decimal point.)

Discussion

30.	A bomb of mass 3m kg explodes into two pieces of mass m kg and 2m kg . If the velocity of m kg mass is 16 m/s, the total energy released in the explosion is
Answer» A bomb of mass $3 m kg$ explodes into two pieces of mass $m kg$ and $2 m kg$ . If the velocity of $m kg$ mass is $16 m/s$ , the total energy released in the explosion is

Discussion

31.	A bullet of mass 50g and specific heat capacity 800 J kg−1 K−1 is initially at a temperature 20∘ C.It is fired vertically upwards with a speed of 200 ms−1 and on returning to the starting point strikes a lump of ice at 0∘ C and gets embedded in it. Assume that all the energy of the bullet is used up in melting. Neglect the friction of air. Latent heat of fusion of ice =3.36×105 J kg−1
Answer» A bullet of mass 50g and specific heat capacity $800 J k g^{- 1} K^{- 1}$ is initially at a temperature $20^{\circ} C$ .It is fired vertically upwards with a speed of $200 m s^{- 1}$ and on returning to the starting point strikes a lump of ice at $0^{\circ} C$ and gets embedded in it. Assume that all the energy of the bullet is used up in melting. Neglect the friction of air. Latent heat of fusion of ice $= 3.36 \times 10^{5} J k g^{- 1}$

Discussion

32.	A hot air balloon, released from ground, moves up with a constant acceleration of 5 ms−2. A stone is released from it at the end of 8s. Find the height (in m) of the stone from the ground, 8s after it is released from the balloon. (Take g=10 ms−2)
Answer» A hot air balloon, released from ground, moves up with a constant acceleration of $5 {ms}^{- 2}$ . A stone is released from it at the end of $8 s$ . Find the height (in $m$ ) of the stone from the ground, $8 s$ after it is released from the balloon. (Take $g = 10 {ms}^{- 2}$ )

Discussion

33.	Find the fundamental, first overtone and second overtone frequencies of an open organ pipe of length 20 cm. Speed of sound in air is 340ms−1.
Answer» Find the fundamental, first overtone and second overtone frequencies of an open organ pipe of length 20 cm. Speed of sound in air is $340 m s^{- 1}$ .

Discussion

34.	The angular velocity of a point on the rim of a rotating wheel is given by ω=(4−6t+3t2) rad/s. What is the average angular acceleration for the time interval t=2 s to t=4 s ?
Answer» The angular velocity of a point on the rim of a rotating wheel is given by $ω = (4 - 6 t + 3 t^{2}) rad/s$ . What is the average angular acceleration for the time interval $t = 2 s$ to $t = 4 s$ ?

Discussion

35.	A bullet of mass 50 g leaves a rifle at an initial velocity of 2000 m/s and strikes the earth at the same level with a velocity of 1000 m/s. The work done in overcoming the resistance of air will be
Answer» A bullet of mass $50 g$ leaves a rifle at an initial velocity of $2000 m/s$ and strikes the earth at the same level with a velocity of $1000 m/s$ . The work done in overcoming the resistance of air will be

Discussion

36.	A ball is moving with speed 12 m/s towards a heavy wall which is moving towards the ball with the speed 10 m/s as shown in figure. Assuming collision to be perfectly elastic, find the speed of ball after the collision.
Answer» A ball is moving with speed $12 m/s$ towards a heavy wall which is moving towards the ball with the speed $10 m/s$ as shown in figure. Assuming collision to be perfectly elastic, find the speed of ball after the collision.

Discussion

37.	If Tnθ+cosnθ, prove that i) T3−t5T1=T5−T7T3
Answer» If $T_{n} θ + c o s^{n} θ$ , prove that i) $\frac{T_{3} - t_{5}}{T_{1}} = \frac{T_{5} - T_{7}}{T_{3}}$

Discussion

38.	The position vector of four particles of masses m1=2 kg, m2=4 kg, m3=6 kg, m4=8 kg are →r1=2^i+3^j+0^k, →r2=0^i+2^j+3^k, →r3=2^i+0^j+3^k; →r4=2^i+3^j+3^k. The position vector of their centre of mass is given by
Answer» The position vector of four particles of masses $m_{1} = 2 kg, m_{2} = 4 kg, m_{3} = 6 kg, m_{4} = 8 kg$ are $_{1} = 2^i + 3^j + 0^k,_{2} = 0^i + 2^j + 3^k,_{3} = 2^i + 0^j + 3^k;_{4} = 2^i + 3^j + 3^k$ . The position vector of their centre of mass is given by

Discussion

39.	The excess pressure inside a spherical drop of water is 4 times that of another drop. Then their respective mass ratio is
Answer» The excess pressure inside a spherical drop of water is $4$ times that of another drop. Then their respective mass ratio is

Discussion

40.	A lamina lies in y−z plane having moment of inertia about x axis Ix=6MR2 and moment of inertia about y− axis Iy=3MR2. Then, the moment of inertia of the lamina about z axis is
Answer» A lamina lies in $y - z$ plane having moment of inertia about $x$ axis $I_{x} = 6 M R^{2}$ and moment of inertia about $y -$ axis $I_{y} = 3 M R^{2}$ . Then, the moment of inertia of the lamina about $z$ axis is

Discussion

41.	Snow is falling vertically at a constant speed of 8.0 m/s. At what angle from the vertical do the snowflakes appear to be falling as viewed by the driver of a car traveling on a straight level road with a speed of 8√3 m/s?
Answer» Snow is falling vertically at a constant speed of $8.0 m/s$ . At what angle from the vertical do the snowflakes appear to be falling as viewed by the driver of a car traveling on a straight level road with a speed of $8 \sqrt{3} m/s$ ?

Discussion

42.	Figure shows a system consisting of a massless pulley, a spring of force constant k and a block of mass m. If the block is slightly displaced vertically down from its equilibrium position and then released, the period of its vertical oscillation is
Answer» Figure shows a system consisting of a massless pulley, a spring of force constant $k$ and a block of mass $m$ . If the block is slightly displaced vertically down from its equilibrium position and then released, the period of its vertical oscillation is

Discussion

43.	Find the rate of change of the area of a circle with respect to its radius r when r=3 cm r = 4 cm
Answer» Find the rate of change of the area of a circle with respect to its radius r when $r = 3 c m$ r = 4 cm

43.

Find the rate of change of the area of a circle with respect to its radius r when r=3 cm r = 4 cm

Answer»

Find the rate of change of the area of a circle with respect to its radius r when

$r = 3 c m$

r = 4 cm

Discussion

44.	How will the image formed by a convex lens be affected, if the central portion of the lens is wrapped in black paper, as shown in the figure below?
Answer» How will the image formed by a convex lens be affected, if the central portion of the lens is wrapped in black paper, as shown in the figure below?

44.

How will the image formed by a convex lens be affected, if the central portion of the lens is wrapped in black paper, as shown in the figure below?

Answer»

How will the image formed by a convex lens be affected, if the central portion of the lens is wrapped in black paper, as shown in the figure below?

Discussion

45.	A moving coil galvanometer works on the principle that at equilibrium,the restoring torque and the torque experienced by the coil would be equal and based on that we calculate the deflection.But,at equilibrium shouldn't the angle be zer?
Answer» A moving coil galvanometer works on the principle that at equilibrium,the restoring torque and the torque experienced by the coil would be equal and based on that we calculate the deflection.But,at equilibrium shouldn't the angle be zer?

Discussion

46.	Two forces are such that the sum of their magnitudes is 18 N and their resultant is perpendicular to the smaller force and magnitude of resultant is 12 N. Then the magnitude of the forces are
Answer» Two forces are such that the sum of their magnitudes is $18 N$ and their resultant is perpendicular to the smaller force and magnitude of resultant is $12 N$ . Then the magnitude of the forces are

Discussion

47.	Two circular discs A and B are of equal masses and thickness but made of metals with densities dA and dB (dA>dB) . If their moments of inertia about an axis passing through their centres and perpendicular to the circular faces are IA and IB then
Answer» Two circular discs $A$ and $B$ are of equal masses and thickness but made of metals with densities $d_{A}$ and $d_{B} (d_{A} > d_{B})$ . If their moments of inertia about an axis passing through their centres and perpendicular to the circular faces are $I_{A}$ and $I_{B}$ then

Discussion

48.	What are stiff and soft spring
Answer» What are stiff and soft spring

Discussion

49.	It's means that if angle of incidence= angle of refraction the the refractive index should be same .but for normal refraction ( not from prism ) this condition is true then why not for prism .
Answer» It's means that if angle of incidence= angle of refraction the the refractive index should be same .but for normal refraction ( not from prism ) this condition is true then why not for prism .

Discussion

50.	What is the function of choke
Answer» What is the function of choke

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A 5V battery with internal resistance 2Ω and a 2V battery with internal resistance 1Ω are connected to a 10Ω resistor as shown in figure. The current in the 10Ω resistor is

Define velocity.

The saturation vapour pressure of water at 100o C is

In the finite network shown in the figure, C1=8μF and C=12μF. The equivalent capacitance between points P and Q is :

A star is moving towards the earth with a speed of 4.5×106 m/s. If the true wavelength of a certain line in the spectrum received from the star is 5890 ∘A, its apparent wavelength will be about _____. [C=3×108 m/s]. Ignore the relativistic effects.

A rod AB of length L and mass M is free to move on a frictionless horizontal surface is moving with a velocity v as shown in fig. End B of rod AB strikes end of wall. Assuming elastic impact, angular velocity of rod AB just after impact is

One mole of an ideal diatomic gas is taken through the cycle as shown in the figure. 1→2 : Isochoric process 2→3 : Straight line on P-V diagram 3→1 : Isobaric process The average molecular speed of the gas in the states 1,2 and 3 are in the ratio

What are vectors?

A transverse wave is travelling along a string from left to right. The figure below represents the shape of the string at a given instant. At this instant, among the following, choose the wrong statement

A steel wire is hanged vertically. What should be its maximum length so that it does not break by its own weight?

If the net force acting on a closed loop is zero then how can a torque act on it??? Moving coil galvanometer has a closed rectangular loop ...still it rotates in uniform magnetic field

A hammer of weight 2 kg, moving with velocity 8 m/s, strikes against the head of a spike, and drives it into a block of wood. If hammer comes to rest in 0.02 sec, the impule associated with the spike will be:

A particle moves in a straight line with retardation proportional to square of its displacement. Its loss of kinetic energy for any displacement ‘x’ is proportional to

The momentum of a photon is 3.3 × 10−29 kg - m/sec. Its frequency will be

Which of the following is the unit vector perpendicular to →A and →B

(i) State Malus's Law. (ii) Draw a graph showing the variation of intensity (I) of polarised light transmitted by an analyser with angle (θ) between polariser and analyser. (iii) What is the value of refractive index of a medium of polarising angle 60∘ ?

An infinitely long rod lies along the axis of a concave mirror of focal length f. The near end of the rod is at a distance u &gt; f from the mirror. Its image will have a length

A block of mass 4 kg is given velocity 4√2 m/s at the bottom of incline plane of angle 37∘ with horizontal. Coefficient of friction between plane and block is x4 where x is distance from bottom of plane. Distance after which block stops on plane is [g = 10 m/s2 ]

What is the ratio of the number of people who did not vote to the number of people who voted for the party in 2000?

Two blocks of masses 1 kg and 2 kg are connected by a metal wire going over a smooth pulley as shown in figure. The breaking sress of the metal is 2×10−9N m−2. What should be the minimum radius of the wire used if it is not to break? Take g=10m s−2.

50 cal of heat should be supplied to take a system from the state A to the state B through the path ACB as shown in figure. Find the quantity of heat to be supplied to take it from A to B via ADB.

Find the radius and energy of a He+ ion in the states (a) n = 1, b) n = 4 and (c) n = 10

The minimum horizontal acceleration (in ms−2) of the container filled with water upto height of 2 m as shown, so that the pressure at point A of the container becomes atmospheric is (the tank is of sufficient height)

The elevator shown in fig. is descending with an acceleration of 2 m/s2. The mass of the block A=0.5 kg and that of B=1 kg. The force exerted by the block A on block B is

The figure shows the velocity and acceleration of a point like body at the initial moment of its motion. The acceleration vector of the body remains constant. The minimum radius of curvature of trajectory of the body is (in m upto two decimals.)

Two waves are passing through a region in the same direction at the same time. If the equation of these waves are y1=αsin2πλ(vt−x) and y2=βsin2πλ[(vt−x)+ϕ], then the amplitude of the resultant wave at ϕ=λ2 is

A bomb of mass 3m kg explodes into two pieces of mass m kg and 2m kg . If the velocity of m kg mass is 16 m/s, the total energy released in the explosion is

A hot air balloon, released from ground, moves up with a constant acceleration of 5 ms−2. A stone is released from it at the end of 8s. Find the height (in m) of the stone from the ground, 8s after it is released from the balloon. (Take g=10 ms−2)

Find the fundamental, first overtone and second overtone frequencies of an open organ pipe of length 20 cm. Speed of sound in air is 340ms−1.

The angular velocity of a point on the rim of a rotating wheel is given by ω=(4−6t+3t2) rad/s. What is the average angular acceleration for the time interval t=2 s to t=4 s ?

A bullet of mass 50 g leaves a rifle at an initial velocity of 2000 m/s and strikes the earth at the same level with a velocity of 1000 m/s. The work done in overcoming the resistance of air will be

A ball is moving with speed 12 m/s towards a heavy wall which is moving towards the ball with the speed 10 m/s as shown in figure. Assuming collision to be perfectly elastic, find the speed of ball after the collision.

If Tnθ+cosnθ, prove that i) T3−t5T1=T5−T7T3

The position vector of four particles of masses m1=2 kg, m2=4 kg, m3=6 kg, m4=8 kg are →r1=2^i+3^j+0^k, →r2=0^i+2^j+3^k, →r3=2^i+0^j+3^k; →r4=2^i+3^j+3^k. The position vector of their centre of mass is given by

The excess pressure inside a spherical drop of water is 4 times that of another drop. Then their respective mass ratio is

A lamina lies in y−z plane having moment of inertia about x axis Ix=6MR2 and moment of inertia about y− axis Iy=3MR2. Then, the moment of inertia of the lamina about z axis is

Snow is falling vertically at a constant speed of 8.0 m/s. At what angle from the vertical do the snowflakes appear to be falling as viewed by the driver of a car traveling on a straight level road with a speed of 8√3 m/s?

Figure shows a system consisting of a massless pulley, a spring of force constant k and a block of mass m. If the block is slightly displaced vertically down from its equilibrium position and then released, the period of its vertical oscillation is

Find the rate of change of the area of a circle with respect to its radius r when r=3 cm r = 4 cm

How will the image formed by a convex lens be affected, if the central portion of the lens is wrapped in black paper, as shown in the figure below?

A moving coil galvanometer works on the principle that at equilibrium,the restoring torque and the torque experienced by the coil would be equal and based on that we calculate the deflection.But,at equilibrium shouldn't the angle be zer?

Two forces are such that the sum of their magnitudes is 18 N and their resultant is perpendicular to the smaller force and magnitude of resultant is 12 N. Then the magnitude of the forces are

Two circular discs A and B are of equal masses and thickness but made of metals with densities dA and dB (dA&gt;dB) . If their moments of inertia about an axis passing through their centres and perpendicular to the circular faces are IA and IB then

What are stiff and soft spring

It's means that if angle of incidence= angle of refraction the the refractive index should be same .but for normal refraction ( not from prism ) this condition is true then why not for prism .

What is the function of choke

An infinitely long rod lies along the axis of a concave mirror of focal length f. The near end of the rod is at a distance u > f from the mirror. Its image will have a length

Two circular discs A and B are of equal masses and thickness but made of metals with densities dA and dB (dA>dB) . If their moments of inertia about an axis passing through their centres and perpendicular to the circular faces are IA and IB then