50278 + Interview Questions in Physics

1.	In the figure intensity from each slit S1, S2 and S3 is I0 at P. Wavelength of light is λ. (D >> d) List - 1 gives some values and List - 2 gives corresponding intensity at P, then correct match is List-1List-2Id2D=λPI0IId2D=λ2Q4I0IIId2D=λ4R5I0IVd2D=2λS9I0T3I0UNone
Answer» In the figure intensity from each slit $S_{1}$ , $S_{2}$ and $S_{3}$ is $I_{0}$ at P. Wavelength of light is $λ$ . (D >> d) List - 1 gives some values and List - 2 gives corresponding intensity at P, then correct match is $\begin{matrix} List-1 & List-2 I & \frac{d^{2}}{D} = λ & P & I_{0} II & \frac{d^{2}}{D} = \frac{λ}{2} & Q & 4 I_{0} III & \frac{d^{2}}{D} = \frac{λ}{4} & R & 5 I_{0} IV & \frac{d^{2}}{D} = 2 λ & S & 9 I_{0} T & 3 I_{0} U & None \end{matrix}$

Discussion

2.	The potential energy of a particle in a certain field has the form U = ar2 - br, where a and b are postive constants , r is the distance from the centre of the field . Find the value of r0 for which the paricle is in stable equilibrium
Answer» The potential energy of a particle in a certain field has the form U = $\frac{a}{r^{2}}$ - $\frac{b}{r}$ , where a and b are postive constants , r is the distance from the centre of the field . Find the value of $r_{0}$ for which the paricle is in stable equilibrium

Discussion

3.	In YDSE experiment, the separation between the slits is equal to 3λ where λ is the wavelength of the light incident on the plane of the slits. A thin film of thickness 2λ and refractive index 2 has been placed in front of the upper slit. Location of central maxima on the screen is
Answer» In YDSE experiment, the separation between the slits is equal to $3 λ$ where $λ$ is the wavelength of the light incident on the plane of the slits. A thin film of thickness $2 λ$ and refractive index 2 has been placed in front of the upper slit. Location of central maxima on the screen is

3.

In YDSE experiment, the separation between the slits is equal to 3λ where λ is the wavelength of the light incident on the plane of the slits. A thin film of thickness 2λ and refractive index 2 has been placed in front of the upper slit. Location of central maxima on the screen is

Answer»

In YDSE experiment, the separation between the slits is equal to $3 λ$ where $λ$ is the wavelength of the light incident on the plane of the slits. A thin film of thickness $2 λ$ and refractive index 2 has been placed in front of the upper slit. Location of central maxima on the screen is

Discussion

4.	For the arrangement in figure: The elongation in spring in equilibrium condition is [take g =10 m/s2]
Answer» For the arrangement in figure: The elongation in spring in equilibrium condition is [take g =10 m/s²]

4.

For the arrangement in figure: The elongation in spring in equilibrium condition is [take g =10 m/s2]

Answer»

For the arrangement in figure: The elongation in spring in equilibrium condition is [take g =10 m/s²]

Discussion

5.	A neutron having KE 5eV is incident on a hydrogen atom in its ground state. The collision-
Answer» A neutron having KE 5eV is incident on a hydrogen atom in its ground state. The collision-

Discussion

6.	The electric field on two sides of a large charged plate is shown. The charge density on the plate in S.I units is given by (ϵ0 is the permittivity of free space in S.I units)
Answer» The electric field on two sides of a large charged plate is shown. The charge density on the plate in S.I units is given by ( $ϵ_{0}$ is the permittivity of free space in S.I units)

6.

The electric field on two sides of a large charged plate is shown. The charge density on the plate in S.I units is given by (ϵ0 is the permittivity of free space in S.I units)

Answer»

The electric field on two sides of a large charged plate is shown. The charge density on the plate in S.I units is given by ( $ϵ_{0}$ is the permittivity of free space in S.I units)

Discussion

7.	A uniform bar of length 6a and mass 8 m lies on a smooth horizontal table. Two point masses m and 2m moving in the same horizontal plane with speed 2v and v respectively, strike the bar and stick to the bar after collision. Denoting angular velocity (about the centre of mass), total energy and centre of mass velocity by ω, E and vc respectively, we have after collision
Answer» A uniform bar of length 6a and mass 8 m lies on a smooth horizontal table. Two point masses m and 2m moving in the same horizontal plane with speed 2v and v respectively, strike the bar and stick to the bar after collision. Denoting angular velocity (about the centre of mass), total energy and centre of mass velocity by $ω$ , $E$ and $v_{c}$ respectively, we have after collision

7.

A uniform bar of length 6a and mass 8 m lies on a smooth horizontal table. Two point masses m and 2m moving in the same horizontal plane with speed 2v and v respectively, strike the bar and stick to the bar after collision. Denoting angular velocity (about the centre of mass), total energy and centre of mass velocity by ω, E and vc respectively, we have after collision

Answer»

A uniform bar of length 6a and mass 8 m lies on a smooth horizontal table. Two point masses m and 2m moving in the same horizontal plane with speed 2v and v respectively, strike the bar and stick to the bar after collision. Denoting angular velocity (about the centre of mass), total energy and centre of mass velocity by $ω$ , $E$ and $v_{c}$ respectively, we have after collision

Discussion

8.	The wavelength of radiation emitted is λ0 when an electron in hydrogen atom jumps from 3rd to 2nd orbit. If in the hydrogen atom itself, the electron jumps from fifth orbit to second orbit, then the wavelength of emitted radiation will be:
Answer» The wavelength of radiation emitted is $λ_{0}$ when an electron in hydrogen atom jumps from 3rd to 2nd orbit. If in the hydrogen atom itself, the electron jumps from fifth orbit to second orbit, then the wavelength of emitted radiation will be:

Discussion

9.	A string with a mass density of 4×10−3 kg/m is under a tension of 360 N and is fixed at both ends. One of its resonance frequencies is 375 Hz. The next higher resonance frequency is 450 Hz. If the mass of the string is represented by x×10−3 kg, find x
Answer» A string with a mass density of $4 \times 10^{- 3} kg/m$ is under a tension of $360 N$ and is fixed at both ends. One of its resonance frequencies is $375 Hz$ . The next higher resonance frequency is $450 Hz$ . If the mass of the string is represented by $x \times 10^{- 3} kg$ , find $x$

Discussion

10.	A magnetising field of 1600 Am−1 produces a magnetic flux of 2.4×10−5 Wb in an iron bar of cross sectional area 0.2 cm2. Calculate permeability and susceptibility of the bar.
Answer» A magnetising field of $1600 A m^{- 1}$ produces a magnetic flux of $2.4 \times 10^{- 5} W b$ in an iron bar of cross sectional area $0.2 c m^{2}$ . Calculate permeability and susceptibility of the bar.

Discussion

11.	A ray reflected successively from two plane mirrors inclined at a certain angle undergoes a deviation of 300∘. The number of observable images are (Formula for number of images is 360θ−1, where θ is the angle between the mirrors.)
Answer» A ray reflected successively from two plane mirrors inclined at a certain angle undergoes a deviation of $300^{\circ}$ . The number of observable images are (Formula for number of images is $\frac{360}{θ} - 1$ , where $θ$ is the angle between the mirrors.)

Discussion

12.	A particle is released from rest at origin. It moves under influence of potential field U=x2−3x, kinetic energy at x=2 is:
Answer» A particle is released from rest at origin. It moves under influence of potential field $U = x^{2} - 3 x$ , kinetic energy at $x = 2$ is:

Discussion

13.	A metallic ball has spherical cavity at its centre. If the ball is heated what happens to the cavity?
Answer» A metallic ball has spherical cavity at its centre. If the ball is heated what happens to the cavity?

Discussion

14.	The wavelength of the light used in Young’s double slit experiment is λ. The intensity at a point on the screen is I, where the path difference is λ6. If I0 denotes the maximum intensity, then the ratio of I and I0 is:
Answer» The wavelength of the light used in Young’s double slit experiment is $λ$ . The intensity at a point on the screen is I, where the path difference is $\frac{λ}{6}$ . If $I_{0}$ denotes the maximum intensity, then the ratio of I and $I_{0}$ is:

Discussion

15.	A uniformly tapering vessel shown in the figure is filled with a liquid of density 900 kg/m3. The force that acts on the base of the vessel due to the liquid is (take g=10 m/s2)
Answer» A uniformly tapering vessel shown in the figure is filled with a liquid of density $900 {kg/m}^{3}$ . The force that acts on the base of the vessel due to the liquid is (take $g = 10 {m/s}^{2}$ )

Discussion

16.	A particle executes SHM in a straight line. The maximum speed of the particle during its motion is v0. Its average speed in one complete oscillation is
Answer» A particle executes SHM in a straight line. The maximum speed of the particle during its motion is $v_{0}$ . Its average speed in one complete oscillation is

Discussion

17.	Tritium has a half life of 12.5 years undergoing beta decay. What fraction of sample of pure tritium will decay in 50 years?
Answer» Tritium has a half life of 12.5 years undergoing beta decay. What fraction of sample of pure tritium will decay in 50 years?

Discussion

18.	A black hole is an object whose gravitational field is so strong that even light cannot escape from it. To what approximate radius would earth (mass =5.98×1024 kg) have to be compressed to be a black hole?
Answer» A black hole is an object whose gravitational field is so strong that even light cannot escape from it. To what approximate radius would earth (mass $= 5.98 \times 10^{24} kg$ ) have to be compressed to be a black hole?

Discussion

19.	Two charges q and -3q are placed fixed on x-axis separated by distance d. At what distance from the q should a third charge 2q be placed such that it will not experience any force?
Answer» Two charges q and -3q are placed fixed on x-axis separated by distance d. At what distance from the q should a third charge 2q be placed such that it will not experience any force?

Discussion

20.	If number of turns per unit length of a coil of a solenoid is doubled, its self-inductance will
Answer» If number of turns per unit length of a coil of a solenoid is doubled, its self-inductance will

Discussion

21.	A thin hoop of weight 500 N and radius 1 m rests on a rough inclined plane as shown in the figure. The minimum coefficient of friction needed for this configuration is
Answer» A thin hoop of weight $500 N$ and radius $1 m$ rests on a rough inclined plane as shown in the figure. The minimum coefficient of friction needed for this configuration is

Discussion

22.	A circuit is shown below. Currently the switch is in position A and steady current is flowing through circuit. Capacitor is uncharged. At t=0, switch is instantly moved to position B. Find the current in the LC circuit.(Given that ω = 1√LC)
Answer» A circuit is shown below. Currently the switch is in position A and steady current is flowing through circuit. Capacitor is uncharged. At $t = 0$ , switch is instantly moved to position B. Find the current in the $L C$ circuit. $(Given that ω = \frac{1}{\sqrt{L C}})$

Discussion

23.	The velocity of the particle at any time t is given by v=2t(3−t)ms−1. At what time is its velocity maximum?
Answer» The velocity of the particle at any time t is given by $v = 2 t (3 - t) m s^{- 1}$ . At what time is its velocity maximum?

Discussion

24.	Choose only incorrect statement from the following
Answer» Choose only incorrect statement from the following

Discussion

25.	A rod of length 20 cm is made of metal. It expands by 0.075 cm when its temperature is raised from 0∘C to 100∘C. Another rod of a different metal B having the same length expands by 0.045 cm for the same change in temperature. A third rod of the same length is composed of two parts one of metal A and the other of metal B. Now, the rod expands by 0.06 cm for the same change in temperature. The portion made of metal A has the length (in cm)
Answer» A rod of length $20 cm$ is made of metal. It expands by $0.075 cm$ when its temperature is raised from $0^{\circ} C$ to $100^{\circ} C$ . Another rod of a different metal B having the same length expands by $0.045 cm$ for the same change in temperature. A third rod of the same length is composed of two parts one of metal A and the other of metal B. Now, the rod expands by $0.06 cm$ for the same change in temperature. The portion made of metal A has the length (in $cm$ )

Discussion

26.	A uniform chain of length L has one of its end attached to the wall at point A, while 3L4of the length of the chain is lying on table as shown in figure. The minimum co-efficient of friction between table and chain so that chain remains in equilibrium is
Answer» A uniform chain of length L has one of its end attached to the wall at point A, while $\frac{3 L}{4}$ of the length of the chain is lying on table as shown in figure. The minimum co-efficient of friction between table and chain so that chain remains in equilibrium is

Discussion

27.	A ball of mass m is projected with velocity u making an angle θ with the horizontal. What is its angular momentum at the highest point?
Answer» A ball of mass $m$ is projected with velocity $u$ making an angle $θ$ with the horizontal. What is its angular momentum at the highest point?

Discussion

28.	Electric charge Q, Q and -2Q respectively are placed at the three corners of an equilateral triangle of side a. Magnitude of the electric dipole moment of the system is
Answer» Electric charge Q, Q and -2Q respectively are placed at the three corners of an equilateral triangle of side a. Magnitude of the electric dipole moment of the system is

Discussion

29.	When a ceiling fan is switched off its angular velocity reduces to half of its value, while it makes 12 rotations. How many more rotations will it make before coming to rest? (Assume uniform angular retardation)
Answer» When a ceiling fan is switched off its angular velocity reduces to half of its value, while it makes $12$ rotations. How many more rotations will it make before coming to rest? (Assume uniform angular retardation)

Discussion

30.	A ball dropped from a height of 10m looses 40% of energy after striking the ground. How much high can the ball bounce back? [ g= 10]
Answer» A ball dropped from a height of 10m looses $40 %$ of energy after striking the ground. How much high can the ball bounce back? [ g= 10]

Discussion

31.	Figure shows four P−V diagrams. Which of these curves represent isothermal and adiabatic process?
Answer» Figure shows four $P - V$ diagrams. Which of these curves represent isothermal and adiabatic process?

Discussion

32.	In the following figure, the pulley P1 is fixed and the pulley P2 is movable. If W1=W2=100 N, what is the the value of ∠AP2P1? The pulleys are light and frictionless.
Answer» In the following figure, the pulley $P_{1}$ is fixed and the pulley $P_{2}$ is movable. If $W_{1} = W_{2} = 100 N$ , what is the the value of $∠ A P_{2} P_{1}$ ? The pulleys are light and frictionless.

Discussion

33.	Value of universal gas constant (R) isa same for all gases. What is its physical significance?
Answer» Value of universal gas constant (R) isa same for all gases. What is its physical significance?

Discussion

34.	Two men with masses m1=60 kg and m2=50 kg are climbing on a rope passing over an ideal pulley. If accelerations of m1 and m2 with respect to the rope are a1=4 m/s2 and a2=2 m/s2 upwards, then tension in the rope is (in Newtons) .
Answer» Two men with masses $m_{1} = 60$ kg and $m_{2} = 50$ kg are climbing on a rope passing over an ideal pulley. If accelerations of $m_{1}$ and $m_{2}$ with respect to the rope are $a_{1} = 4 m / s^{2}$ and $a_{2} = 2 m / s^{2}$ upwards, then tension in the rope is (in Newtons) .

Discussion

35.	Give reason it is easier to catch a tennis ball than a cricket ball even when both are moving on same velocity
Answer» Give reason it is easier to catch a tennis ball than a cricket ball even when both are moving on same velocity

Discussion

36.	From Snell's law, why with the increase in the angle of the incident ray of rarer medium increases the angle of refraction of denser medium.
Answer» From Snell's law, why with the increase in the angle of the incident ray of rarer medium increases the angle of refraction of denser medium.

Discussion

37.	Water is drawn from a well in a 5 kg drum of capacity 55 L by two ropes connected to the top of the drum. The linear mass density of each rope is 0.5 kgm−1. The work done in lifting water to the ground from the surface of water in the well 20 m below is [g = 10 ms−2]
Answer» Water is drawn from a well in a 5 kg drum of capacity 55 L by two ropes connected to the top of the drum. The linear mass density of each rope is 0.5 kg $m^{- 1}$ . The work done in lifting water to the ground from the surface of water in the well 20 m below is [g = 10 m $s^{- 2}$ ]

Discussion

38.	A spherical body of area 300 cm2 has emissive power of 3000 J/m2s. Find the amount of thermal energy radiated by the body in 10 s.
Answer» A spherical body of area $300 {cm}^{2}$ has emissive power of $3000 {J/m}^{2} s$ . Find the amount of thermal energy radiated by the body in $10 s$ .

Discussion

39.	If a particle moves with a constant speed the distance time graph will look like??
Answer» If a particle moves with a constant speed the distance time graph will look like??

Discussion

40.	When a ball is thrown upwards from top of the building, the time of ascend is 4s. Will it takes 4s to land at the bottom of the building? (since time of ascent =time of descend)
Answer» When a ball is thrown upwards from top of the building, the time of ascend is 4s. Will it takes 4s to land at the bottom of the building? (since time of ascent =time of descend)

Discussion

41.	M.O.I. of a ring of radius R and mass M about a line passing throught its center and perpendicular to its plane is I. Find out the M.O.I (It) about an axis which is a tangent and also perpendicular to the plane of circle as shown in figure.
Answer» M.O.I. of a ring of radius $R$ and mass $M$ about a line passing throught its center and perpendicular to its plane is $I$ . Find out the M.O.I $(I_{t})$ about an axis which is a tangent and also perpendicular to the plane of circle as shown in figure.

Discussion

42.	A piston of cross-sectional area 100 cm2 is used in a hydraulic pump to exert a force of 107 dyne on the water. The cross-sectional area of the other piston which supports a truck of mass 2000 kg is
Answer» A piston of cross-sectional area $100 {cm}^{2}$ is used in a hydraulic pump to exert a force of $10^{7} dyne$ on the water. The cross-sectional area of the other piston which supports a truck of mass $2000 kg$ is

Discussion

43.	The threshold wavelength for certain metal is . When light of wavelength λ02 is incident on it, the maximum velocity of photo electrons is 106 m/s. If the wavelength of incident light is changed to λ05 the maximum velocity of photo electrons is
Answer» The threshold wavelength for certain metal is . When light of wavelength $\frac{λ_{0}}{2}$ is incident on it, the maximum velocity of photo electrons is $10^{6} m / s$ . If the wavelength of incident light is changed to $\frac{λ_{0}}{5}$ the maximum velocity of photo electrons is

Discussion

44.	Which of the following is/are conservative force(s)?
Answer» Which of the following is/are conservative force(s)?

Discussion

45.	Two blocks A and B each of mass m are connected by a massless spring of natural length L and spring constant k. The blocks are initially resting on a smooth horizontal floor with the spring in its natural length, as shown in figure. A third identical block C, also of mass m moves on the floor with a speed v along the line joining A and B collides with A, elastically. Then,
Answer» Two blocks A and B each of mass m are connected by a massless spring of natural length L and spring constant k. The blocks are initially resting on a smooth horizontal floor with the spring in its natural length, as shown in figure. A third identical block C, also of mass m moves on the floor with a speed v along the line joining A and B collides with A, elastically. Then,

45.

Two blocks A and B each of mass m are connected by a massless spring of natural length L and spring constant k. The blocks are initially resting on a smooth horizontal floor with the spring in its natural length, as shown in figure. A third identical block C, also of mass m moves on the floor with a speed v along the line joining A and B collides with A, elastically. Then,

Answer»

Two blocks A and B each of mass m are connected by a massless spring of natural length L and spring constant k. The blocks are initially resting on a smooth horizontal floor with the spring in its natural length, as shown in figure.

A third identical block C, also of mass m moves on the floor with a speed v along the line joining A and B collides with A, elastically. Then,

Discussion

46.	Two Circular loops of radius R and nR are made from the same wire . The moment of inertia about the axis passing through centre and perpendicular to the plane of the larger loop is 8 times that of smaller loop. What is value of n
Answer» Two Circular loops of radius R and nR are made from the same wire . The moment of inertia about the axis passing through centre and perpendicular to the plane of the larger loop is 8 times that of smaller loop. What is value of n

Discussion

47.	If two resistors of resistances R1 = (4±0.5) ohm and R2 = (16±0.5) ohm are connected in series, find the equivalent resistance with limits of percentage error.
Answer» If two resistors of resistances R1 = (4±0.5) ohm and R2 = (16±0.5) ohm are connected in series, find the equivalent resistance with limits of percentage error.

Discussion

48.	A block of mass m is revolving in a smooth horizontal plane with a constant speed v. If the radius of the circular path is R, find the total contact force received by the block.
Answer» A block of mass m is revolving in a smooth horizontal plane with a constant speed v. If the radius of the circular path is R, find the total contact force received by the block.

Discussion

49.	A copper sphere is suspended in a evacuated chamber maintained at 300 K. The sphere is maintained at a constant temperture of 500 K by heating it electrically. A total of 210 W of electric power is needed to do it. When the surface of the copper sphere is completely blackend, 700 W is needed to maintain the same temperature of the sphere. Calculate the emissivity of copper.
Answer» A copper sphere is suspended in a evacuated chamber maintained at 300 K. The sphere is maintained at a constant temperture of 500 K by heating it electrically. A total of 210 W of electric power is needed to do it. When the surface of the copper sphere is completely blackend, 700 W is needed to maintain the same temperature of the sphere. Calculate the emissivity of copper.

Discussion

50.	The brakes applied to a car produce an acceleration of 6 m/s2 in the opposite direction to the motion. If the car takes 2 s to stop after the application of brakes, calculate the distance it travels during this time.
Answer» The brakes applied to a car produce an acceleration of $6 {m/s}^{2}$ in the opposite direction to the motion. If the car takes $2 s$ to stop after the application of brakes, calculate the distance it travels during this time.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

In the figure intensity from each slit S1, S2 and S3 is I0 at P. Wavelength of light is λ. (D >> d) List - 1 gives some values and List - 2 gives corresponding intensity at P, then correct match is List-1List-2Id2D=λPI0IId2D=λ2Q4I0IIId2D=λ4R5I0IVd2D=2λS9I0T3I0UNone

The potential energy of a particle in a certain field has the form U = ar2 - br, where a and b are postive constants , r is the distance from the centre of the field . Find the value of r0 for which the paricle is in stable equilibrium

In YDSE experiment, the separation between the slits is equal to 3λ where λ is the wavelength of the light incident on the plane of the slits. A thin film of thickness 2λ and refractive index 2 has been placed in front of the upper slit. Location of central maxima on the screen is

For the arrangement in figure: The elongation in spring in equilibrium condition is [take g =10 m/s2]

A neutron having KE 5eV is incident on a hydrogen atom in its ground state. The collision-

The electric field on two sides of a large charged plate is shown. The charge density on the plate in S.I units is given by (ϵ0 is the permittivity of free space in S.I units)

The wavelength of radiation emitted is λ0 when an electron in hydrogen atom jumps from 3rd to 2nd orbit. If in the hydrogen atom itself, the electron jumps from fifth orbit to second orbit, then the wavelength of emitted radiation will be:

A string with a mass density of 4×10−3 kg/m is under a tension of 360 N and is fixed at both ends. One of its resonance frequencies is 375 Hz. The next higher resonance frequency is 450 Hz. If the mass of the string is represented by x×10−3 kg, find x

A magnetising field of 1600 Am−1 produces a magnetic flux of 2.4×10−5 Wb in an iron bar of cross sectional area 0.2 cm2. Calculate permeability and susceptibility of the bar.

A ray reflected successively from two plane mirrors inclined at a certain angle undergoes a deviation of 300∘. The number of observable images are (Formula for number of images is 360θ−1, where θ is the angle between the mirrors.)

A particle is released from rest at origin. It moves under influence of potential field U=x2−3x, kinetic energy at x=2 is:

A metallic ball has spherical cavity at its centre. If the ball is heated what happens to the cavity?

The wavelength of the light used in Young’s double slit experiment is λ. The intensity at a point on the screen is I, where the path difference is λ6. If I0 denotes the maximum intensity, then the ratio of I and I0 is:

A uniformly tapering vessel shown in the figure is filled with a liquid of density 900 kg/m3. The force that acts on the base of the vessel due to the liquid is (take g=10 m/s2)

A particle executes SHM in a straight line. The maximum speed of the particle during its motion is v0. Its average speed in one complete oscillation is

Tritium has a half life of 12.5 years undergoing beta decay. What fraction of sample of pure tritium will decay in 50 years?

A black hole is an object whose gravitational field is so strong that even light cannot escape from it. To what approximate radius would earth (mass =5.98×1024 kg) have to be compressed to be a black hole?

Two charges q and -3q are placed fixed on x-axis separated by distance d. At what distance from the q should a third charge 2q be placed such that it will not experience any force?

If number of turns per unit length of a coil of a solenoid is doubled, its self-inductance will

A thin hoop of weight 500 N and radius 1 m rests on a rough inclined plane as shown in the figure. The minimum coefficient of friction needed for this configuration is

A circuit is shown below. Currently the switch is in position A and steady current is flowing through circuit. Capacitor is uncharged. At t=0, switch is instantly moved to position B. Find the current in the LC circuit.(Given that ω = 1√LC)

The velocity of the particle at any time t is given by v=2t(3−t)ms−1. At what time is its velocity maximum?

Choose only incorrect statement from the following

A uniform chain of length L has one of its end attached to the wall at point A, while 3L4of the length of the chain is lying on table as shown in figure. The minimum co-efficient of friction between table and chain so that chain remains in equilibrium is

A ball of mass m is projected with velocity u making an angle θ with the horizontal. What is its angular momentum at the highest point?

Electric charge Q, Q and -2Q respectively are placed at the three corners of an equilateral triangle of side a. Magnitude of the electric dipole moment of the system is

When a ceiling fan is switched off its angular velocity reduces to half of its value, while it makes 12 rotations. How many more rotations will it make before coming to rest? (Assume uniform angular retardation)

A ball dropped from a height of 10m looses 40% of energy after striking the ground. How much high can the ball bounce back? [ g= 10]

Figure shows four P−V diagrams. Which of these curves represent isothermal and adiabatic process?

In the following figure, the pulley P1 is fixed and the pulley P2 is movable. If W1=W2=100 N, what is the the value of ∠AP2P1? The pulleys are light and frictionless.

Value of universal gas constant (R) isa same for all gases. What is its physical significance?

Two men with masses m1=60 kg and m2=50 kg are climbing on a rope passing over an ideal pulley. If accelerations of m1 and m2 with respect to the rope are a1=4 m/s2 and a2=2 m/s2 upwards, then tension in the rope is (in Newtons) .

Give reason it is easier to catch a tennis ball than a cricket ball even when both are moving on same velocity

From Snell's law, why with the increase in the angle of the incident ray of rarer medium increases the angle of refraction of denser medium.

Water is drawn from a well in a 5 kg drum of capacity 55 L by two ropes connected to the top of the drum. The linear mass density of each rope is 0.5 kgm−1. The work done in lifting water to the ground from the surface of water in the well 20 m below is [g = 10 ms−2]

A spherical body of area 300 cm2 has emissive power of 3000 J/m2s. Find the amount of thermal energy radiated by the body in 10 s.

If a particle moves with a constant speed the distance time graph will look like??

When a ball is thrown upwards from top of the building, the time of ascend is 4s. Will it takes 4s to land at the bottom of the building? (since time of ascent =time of descend)

M.O.I. of a ring of radius R and mass M about a line passing throught its center and perpendicular to its plane is I. Find out the M.O.I (It) about an axis which is a tangent and also perpendicular to the plane of circle as shown in figure.

A piston of cross-sectional area 100 cm2 is used in a hydraulic pump to exert a force of 107 dyne on the water. The cross-sectional area of the other piston which supports a truck of mass 2000 kg is

The threshold wavelength for certain metal is . When light of wavelength λ02 is incident on it, the maximum velocity of photo electrons is 106 m/s. If the wavelength of incident light is changed to λ05 the maximum velocity of photo electrons is

Which of the following is/are conservative force(s)?

Two Circular loops of radius R and nR are made from the same wire . The moment of inertia about the axis passing through centre and perpendicular to the plane of the larger loop is 8 times that of smaller loop. What is value of n

If two resistors of resistances R1 = (4±0.5) ohm and R2 = (16±0.5) ohm are connected in series, find the equivalent resistance with limits of percentage error.

A block of mass m is revolving in a smooth horizontal plane with a constant speed v. If the radius of the circular path is R, find the total contact force received by the block.

The brakes applied to a car produce an acceleration of 6 m/s2 in the opposite direction to the motion. If the car takes 2 s to stop after the application of brakes, calculate the distance it travels during this time.