50278 + Interview Questions in Physics

1.	The length of a potentiometer wire 1200 cm and it carries a current of 60 mA. For a cell of emf 5 V and internal resistance of 20 Ω, the null point on it is found to be 1000 cm. The resistance of whole wire is:
Answer» The length of a potentiometer wire $1200 cm$ and it carries a current of $60 mA$ . For a cell of emf $5 V$ and internal resistance of $20 Ω$ , the null point on it is found to be $1000 cm$ . The resistance of whole wire is:

Discussion

2.	The ratio of energy required to raise a satellite to a height h above the earth surface to that required to put into orbit is a) h:2Rb) 2h:Rc) R:hd) h:RBot these terms mean the same thing right? Then ratio should be 1:1?
Answer» The ratio of energy required to raise a satellite to a height h above the earth surface to that required to put into orbit is a) h:2R b) 2h:R c) R:h d) h:R Bot these terms mean the same thing right? Then ratio should be 1:1?

Discussion

3.	In a biprism experiment, when sodium light of wavelength 5890 ∘A is used, then twenty fringes are observed in 23 mm distance on screen. In order to obtain 30 fringes in 28 mm of the interference pattern, one should use light of wavelength
Answer» In a biprism experiment, when sodium light of wavelength $5890 \circ A$ is used, then twenty fringes are observed in $23 mm$ distance on screen. In order to obtain $30$ fringes in $28 mm$ of the interference pattern, one should use light of wavelength

Discussion

4.	The total energy of an electron in the ground state of the hydrogen atom is −13.6 eV. The kinetic energy of an electron in the first excited state is
Answer» The total energy of an electron in the ground state of the hydrogen atom is $- 13.6 eV .$ The kinetic energy of an electron in the first excited state is

Discussion

5.	Twelve resistors each of resistance r are connected together so that each lies along the edge of the cube as shown in the figure. The equivalent resistance between points 1 and 3 is
Answer» Twelve resistors each of resistance $r$ are connected together so that each lies along the edge of the cube as shown in the figure. The equivalent resistance between points $1$ and $3$ is

Discussion

6.	The dimensions of the base of a rectangular vessel are 60 cm × 45 cm. Its height is 20 cm. The vessel is half-filled with water. What should be the size of a solid iron cube which when dropped into the vessel will raise the water level up to the brim?
Answer» The dimensions of the base of a rectangular vessel are 60 cm × 45 cm. Its height is 20 cm. The vessel is half-filled with water. What should be the size of a solid iron cube which when dropped into the vessel will raise the water level up to the brim?

Discussion

7.	If a mass is moving with constant velocity along y axis then prove that its angular momentum about origin is zero
Answer» If a mass is moving with constant velocity along y axis then prove that its angular momentum about origin is zero

Discussion

8.	73. If momentum� of a particle becomes double then %age increase in its� K.E is
Answer» 73. If momentum� of a particle becomes double then %age increase in its� K.E is

Discussion

9.	A charge of 10 esu is placed at a distance of 2 cm from a charge of 40 esu and 4 cm from another charge -20 esu. The potential energy of the 10 esu is ? ( in ergs )
Answer» A charge of 10 esu is placed at a distance of 2 cm from a charge of 40 esu and 4 cm from another charge -20 esu. The potential energy of the 10 esu is ? ( in ergs )

Discussion

10.	For the given charge distribution on the ring, the net electric field at the centre of non-conducting ring is(Assume the part of ring in first and third quadrant is neutral, second quadrant is positively charged, fourth quadrant is negatively charged)
Answer» For the given charge distribution on the ring, the net electric field at the centre of non-conducting ring is (Assume the part of ring in first and third quadrant is neutral, second quadrant is positively charged, fourth quadrant is negatively charged)

Discussion

11.	A block of mass 100 kg is attached to the back of a truck with the help of a spring. The frictional coefficient between the truck and the block is 0.2 (take μs=μk). Acceleration of the truck is 5 m/s2 and the spring elongates by a distance of 1 cm. If the block is just about to slip, what is the force constant of the spring? Take g=10 m/s2.
Answer» A block of mass $100 kg$ is attached to the back of a truck with the help of a spring. The frictional coefficient between the truck and the block is $0.2$ (take $μ_{s} = μ_{k})$ . Acceleration of the truck is $5 {m/s}^{2}$ and the spring elongates by a distance of $1 cm$ . If the block is just about to slip, what is the force constant of the spring? Take $g = 10 {m/s}^{2}$ .

Discussion

12.	a solid conducting sphere of radius 1 m, enclosed by a metallic shell of radius 3 m such that theircentres coincide. If outer shell is given a charge of 6 μC and inner sphere is earthed, find magnitude charge on thesurface of inner shellWhy can't charge on inner sphere be zero inspite of the fact that it is grounded??
Answer» a solid conducting sphere of radius 1 m, enclosed by a metallic shell of radius 3 m such that their centres coincide. If outer shell is given a charge of 6 μC and inner sphere is earthed, find magnitude charge on the surface of inner shell Why can't charge on inner sphere be zero inspite of the fact that it is grounded??

Discussion

13.	Two balls of the same size and the same massstrike the floor from certain height. The first ballrebounds to the same height and the second balldoes not rebound. Which ball experiences greaterchange of linear momentum?(1) First ball(2) Second ball(3) Both balls experience equal change of linearmomentum(4) Both balls experience no change of momentum
Answer» Two balls of the same size and the same massstrike the floor from certain height. The first ballrebounds to the same height and the second balldoes not rebound. Which ball experiences greaterchange of linear momentum?(1) First ball(2) Second ball(3) Both balls experience equal change of linearmomentum(4) Both balls experience no change of momentum

Discussion

14.	The momentum p (in kg m/s) of a particle is varying with time t ( in s) as p= 2+3t square. The force acting on the particle at t= 3 s will be??
Answer» The momentum p (in kg m/s) of a particle is varying with time t ( in s) as p= 2+3t square. The force acting on the particle at t= 3 s will be??

Discussion

15.	Two masses, A and B, are fixed at both the ends of a light rod as shown in figure. There are two axis 00' and AA' about which the rod can be rotated. In which of the case the rotational inertia of the system will be more?
Answer» Two masses, A and B, are fixed at both the ends of a light rod as shown in figure. There are two axis 00' and AA' about which the rod can be rotated. In which of the case the rotational inertia of the system will be more?

Discussion

16.	Application of convection, radiation, conduction
Answer» Application of convection, radiation, conduction

Discussion

17.	If f(x)=x2−1, then find fofof.
Answer» $If f (x) = x^{2} - 1, then find f o f o f .$

Discussion

18.	How the formation of stars are governed by the gravitational force?
Answer» How the formation of stars are governed by the gravitational force?

Discussion

19.	An astronomical telescope has on objective of focal length 200 cm and an eye piece of focal length 4.0 cm. The telescope is focused to see an object 10 km from the objective. The final image is formed at infinity. Find the length of the tube and the angular magnification produced by the telescope.
Answer» An astronomical telescope has on objective of focal length $200 c m$ and an eye piece of focal length $4.0 c m$ . The telescope is focused to see an object $10 k m$ from the objective. The final image is formed at infinity. Find the length of the tube and the angular magnification produced by the telescope.

Discussion

20.	A projectile is projected from the level ground in vertical x-y plane (vertical is y axis). The point of projection is considered as the origin. For which of the following initial velocities of projection u and angle of projection θ with the horizontal will the projectile pass through the point (4, 2) (all in m) (Neglect air friction)
Answer» A projectile is projected from the level ground in vertical x-y plane (vertical is y axis). The point of projection is considered as the origin. For which of the following initial velocities of projection u and angle of projection $θ$ with the horizontal will the projectile pass through the point (4, 2) (all in m) (Neglect air friction)

Discussion

21.	Two particles ‘A’ and ‘B’ start SHM at t = 0. Their positions as a function of time are given by XA=AsinωtXB=Asin(ωt+π3)Column - IColumn - II(A) Minimum time when x is same(P)5π6ω(B) Minimum time when velocity is same(Q)π3ω(C) Minimum time after which vA<0 and vB<0(R)πω(D) Minimum time after which xA<0 and xB<0(S)π2ωWhich of the following option has the correct combination considering column-I and column-II.
Answer» Two particles ‘A’ and ‘B’ start SHM at t = 0. Their positions as a function of time are given by $X_{A} = A sin ω t$ $X_{B} = A sin (ω t + \frac{π}{3})$ $\begin{matrix} Column - I & Column - II (A) Minimum time when x is same & (P) \frac{5 π}{6 ω} (B) Minimum time when velocity is same & (Q) \frac{π}{3 ω} (C) Minimum time after which v_{A} < 0 and v_{B} < 0 & (R) \frac{π}{ω} (D) Minimum time after which x_{A} < 0 and x_{B} < 0 & (S) \frac{π}{2 ω} \end{matrix}$ Which of the following option has the correct combination considering column-I and column-II.

Discussion

22.	A sphere of mass m is tied to end of a string of length l and rotated through the other end along a horizontal circular path with speed v. The work done in full horizontal circle is
Answer» A sphere of mass m is tied to end of a string of length l and rotated through the other end along a horizontal circular path with speed v. The work done in full horizontal circle is

Discussion

23.	The approximate value of magnetic field due to a dipole of magnetic moment 1.2 Am2 at a point 1 m away from it in a direction making an angle of 60∘ with the dipole axis is
Answer» The approximate value of magnetic field due to a dipole of magnetic moment $1.2 {Am}^{2}$ at a point $1 m$ away from it in a direction making an angle of $60^{\circ}$ with the dipole axis is

Discussion

24.	long straight wire has linear charge density 4×10−9Cm−1 .the negative charge q = −5μC is at perpendicular distance 4cm from it, The force experienced By the charge is
Answer» long straight wire has linear charge density $4 \times 10^{- 9} C m^{- 1}$ .the negative charge q = $- 5 μ C$ is at perpendicular distance $4cm$ from it, The force experienced By the charge is

Discussion

25.	Estimate the average thermal energy of a helium atom at (i) room temperature (27 °C), (ii) the temperature on the surface of the Sun (6000 K), (iii) the temperature of 10 million kelvin (the typical core temperature in the case of a star).
Answer» Estimate the average thermal energy of a helium atom at (i) room temperature (27 °C), (ii) the temperature on the surface of the Sun (6000 K), (iii) the temperature of 10 million kelvin (the typical core temperature in the case of a star).

Discussion

26.	An image of the Sun is formed by a lens, of focal length of 30 cm, on the metal surface of a photoelectric cell and a photoelectric current I is produced. The lens forming the image is then replaced by another of the same diameter but of focal length 15 cm, the photoelectric current in this case is kI,then k=___
Answer» An image of the Sun is formed by a lens, of focal length of 30 cm, on the metal surface of a photoelectric cell and a photoelectric current $I$ is produced. The lens forming the image is then replaced by another of the same diameter but of focal length 15 cm, the photoelectric current in this case is k $I$ ,then k=___

Discussion

27.	KE of an electron is E when incident wavelength is lambda. To increase the KE of the electron to 2E the incident wavelength must be
Answer» KE of an electron is E when incident wavelength is lambda. To increase the KE of the electron to 2E the incident wavelength must be

Discussion

28.	QHow much energy would be required by an electron while movingfrom ground state to third excited state of He^+ ion 1)40.8ev 2)51ev 3)10.2ev 4)48.35ev
Answer» QHow much energy would be required by an electron while movingfrom ground state to third excited state of He^+ ion 1)40.8ev 2)51ev 3)10.2ev 4)48.35ev

Discussion

29.	How does condition change when air resistance is included for ball thrown up(formula for air resistance,equation of motion,graph etc)
Answer» How does condition change when air resistance is included for ball thrown up(formula for air resistance,equation of motion,graph etc)

Discussion

30.	Btw 2 stations a train accelerates uniformly at first then moves with constant speed and finally retards uniformly. If the ratios of time taken are 1:8:1 and the greatest spewd is 60km/h, find the average speed over the whole journey
Answer» Btw 2 stations a train accelerates uniformly at first then moves with constant speed and finally retards uniformly. If the ratios of time taken are 1:8:1 and the greatest spewd is 60km/h, find the average speed over the whole journey

Discussion

31.	The figure shows an arrangement of a heavy propeller shaft in a ship. The conmined polar mass moment of inertia of the propeller and the shaft is 100kg.m2. The propeller rotates at ω=12 rad/s. The waves acting on the ship hull induces a rolling motion as shown in the figure with an angular velocity of 5 rad/s. The gyroscopic moment generated on the shaft due to the motion described is N.m[Round off to the nearest integer]
Answer» The figure shows an arrangement of a heavy propeller shaft in a ship. The conmined polar mass moment of inertia of the propeller and the shaft is $100 k g . m^{2}$ . The propeller rotates at $ω = 12$ rad/s. The waves acting on the ship hull induces a rolling motion as shown in the figure with an angular velocity of 5 rad/s. The gyroscopic moment generated on the shaft due to the motion described is N.m[Round off to the nearest integer]

Discussion

32.	(C) 23%4.A candle of diameter d is floating on a liquid in a cylindricalcontainer of diameter D (D>>d) as shown in figure. If it isburning at the rate of 2cm/hour then the top of the candlewill\lbrack AIIMS 2005\rbrack6.L(a) Remain at the same height(b) Fall at the rate of 1 cm/hour(c) Fall at the rate of 2 cm/hourdkD(d) Go up the rate of 1 cm/hour
Answer» (C) 23%4.A candle of diameter d is floating on a liquid in a cylindricalcontainer of diameter D (D>>d) as shown in figure. If it isburning at the rate of 2cm/hour then the top of the candlewill\lbrack AIIMS 2005\rbrack6.L(a) Remain at the same height(b) Fall at the rate of 1 cm/hour(c) Fall at the rate of 2 cm/hourdkD(d) Go up the rate of 1 cm/hour

Discussion

33.	Find the moment of inertia of a non-uniform rod having mass per unit length λ=λ0(1+xL) about an axis ⊥ to the length of the rod and passing through an end point L. Length of the rod is L and m is mass of the rod.
Answer» Find the moment of inertia of a non-uniform rod having mass per unit length $λ = λ_{0} (1 + \frac{x}{L})$ about an axis $⊥$ to the length of the rod and passing through an end point $L$ . Length of the rod is $L$ and $m$ is mass of the rod.

Discussion

34.	A positive charge is moving towards a person. The direction of magnetic field lines will be in:
Answer» A positive charge is moving towards a person. The direction of magnetic field lines will be in:

Discussion

35.	A projectile of mass m is fired into a liquid at an angle θ_{} with an initial velocity v as shown. If the liquid develops a frictional or drag resistance on the projectile which is proportional to its velocity, i.e., F =-kv where k is a positive constant, determine the x and ycomponents of its velocity at any instant.Also find the maximum distance x_{ma} that it travels?
Answer» A projectile of mass m is fired into a liquid at an angle θ_{} with an initial velocity v as shown. If the liquid develops a frictional or drag resistance on the projectile which is proportional to its velocity, i.e., F =-kv where k is a positive constant, determine the x and ycomponents of its velocity at any instant.Also find the maximum distance x_{ma} that it travels?

Discussion

36.	In a transformer Np = 500, Ns = 5000. Input voltage is 20 V and frequency is 50 Hz. Then in the output, we have,
Answer» In a transformer N_p = 500, N_s = 5000. Input voltage is 20 V and frequency is 50 Hz. Then in the output, we have,

Discussion

37.	A cubical block rests on a plane of μ=√3. The angle through which the plane be inclined to the horizontal so that the block just slides down will be
Answer» A cubical block rests on a plane of $μ = \sqrt{3}$ . The angle through which the plane be inclined to the horizontal so that the block just slides down will be

Discussion

38.	A man of mass 50 kg stands on a frame of mass 30 kg. He pulls on a light rope which passes over a pulley. The other end of the rope is attached to the frame. For the system to be in equilibrium, what force must the man exert on the rope? (Take g=10 m/s2)
Answer» A man of mass $50 kg$ stands on a frame of mass $30 kg$ . He pulls on a light rope which passes over a pulley. The other end of the rope is attached to the frame. For the system to be in equilibrium, what force must the man exert on the rope? (Take $g = 10 {m/s}^{2}$ )

Discussion

39.	17.A coil of area 500 cm2 having 1000 turns is held perpendicular to a uniform magnetic field 0.4 G induced emf in the coil if it is turned through angle of 180^°in 1/10 sec is
Answer» 17.A coil of area 500 cm2 having 1000 turns is held perpendicular to a uniform magnetic field 0.4 G induced emf in the coil if it is turned through angle of 180^°in 1/10 sec is

Discussion

40.	Two small identical balls P and Q, each of mass √310 gram, carrying identical charges are suspended by threads of equal lengths. At equilibrium, they position themselves as shown in the figure, what is the charge on each ball ?.[ Given 14πϵ0=9×109 Nm2C−2 and take g=10 ms−2.]
Answer» Two small identical balls $P$ and $Q$ , each of mass $\frac{\sqrt{3}}{10} gram$ , carrying identical charges are suspended by threads of equal lengths. At equilibrium, they position themselves as shown in the figure, what is the charge on each ball ?. [ Given $\frac{1}{4 π ϵ_{0}} = 9 \times 10^{9} {Nm}^{2} C^{- 2}$ and take $g = 10 {ms}^{- 2}$ .]

Discussion

41.	Two objects of masses, 1×10−3 kg and 4×10−3 kg have equal momentum. What is the ratio of their kinetic energies?
Answer» Two objects of masses, $1 \times 10^{- 3} kg$ and $4 \times 10^{- 3} kg$ have equal momentum. What is the ratio of their kinetic energies?

Discussion

42.	Two blocks A and B of mass mA and mB respectively are kept in contact on a frictionless table. The experimenter pushes the block A from behind so that the block B, what is the force exerted by the experimenter on A ?
Answer» Two blocks A and B of mass $m_{A}$ and $m_{B}$ respectively are kept in contact on a frictionless table. The experimenter pushes the block A from behind so that the block B, what is the force exerted by the experimenter on A ?

Discussion

43.	A particle moving in a straight line has velocity and displacement equation as v=4\sqrt{1+s} where v is in m/s and s is in m the initial velocity of the particle is
Answer» A particle moving in a straight line has velocity and displacement equation as v=4\sqrt{1+s} where v is in m/s and s is in m the initial velocity of the particle is

Discussion

44.	Which of following can not be polarised[Kerala PMT 2001]
Answer» Which of following can not be polarised [Kerala PMT 2001]

44.

Which of following can not be polarised[Kerala PMT 2001]

Answer»

Which of following can not be polarised

[Kerala PMT 2001]

Discussion

45.	Consider the situation shown in figure. The wire which has a mass of 4.00 g oscillates in its second harmonic and sets the air column in the tube into vibrations in its fundamental mode. Assuming that the speed of sound in air is 340 ms−1, find the tension in the wire.
Answer» Consider the situation shown in figure. The wire which has a mass of 4.00 g oscillates in its second harmonic and sets the air column in the tube into vibrations in its fundamental mode. Assuming that the speed of sound in air is 340 $m s^{- 1}$ , find the tension in the wire.

45.

Consider the situation shown in figure. The wire which has a mass of 4.00 g oscillates in its second harmonic and sets the air column in the tube into vibrations in its fundamental mode. Assuming that the speed of sound in air is 340 ms−1, find the tension in the wire.

Answer»

Consider the situation shown in figure. The wire which has a mass of 4.00 g oscillates in its second harmonic and sets the air column in the tube into vibrations in its fundamental mode. Assuming that the speed of sound in air is 340 $m s^{- 1}$ , find the tension in the wire.

Discussion

46.	Three rods are joined to form an equilateral triangle having side L. If each rod has m .find moment of inertia about an axis passing through centre of mass and perpendicular to plane of structure(by both perpendicular axis theorem and by parallel axis theorem).?
Answer» Three rods are joined to form an equilateral triangle having side L. If each rod has m .find moment of inertia about an axis passing through centre of mass and perpendicular to plane of structure(by both perpendicular axis theorem and by parallel axis theorem).?

Discussion

47.	In a double slit experiment, when light of wavelength 400 nm was used, the angular width of the first minima formed on a screen placed im away, was found to be 0.2^°. What will be the angular width of the first minima, if the entire experimental apparatus immered in water
Answer» In a double slit experiment, when light of wavelength 400 nm was used, the angular width of the first minima formed on a screen placed im away, was found to be 0.2^°. What will be the angular width of the first minima, if the entire experimental apparatus immered in water

Discussion

48.	A uniformly charged ring has linear charge density 4Cm. What is the electric potential at its centre?
Answer» A uniformly charged ring has linear charge density $4 \frac{C}{m}$ . What is the electric potential at its centre?

Discussion

49.	What is the value of sin 10° + sin 20° + sin 30° + ... + sin 360°
Answer» What is the value of sin 10° + sin 20° + sin 30° + ... + sin 360°

Discussion

50.	An electric dipole of dipole moment p is placed in the position of stable equilibrium in uniform electric field of intensity E. The potential energy of the electric dipole in the final position is.
Answer» An electric dipole of dipole moment p is placed in the position of stable equilibrium in uniform electric field of intensity E. The potential energy of the electric dipole in the final position is.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The length of a potentiometer wire 1200 cm and it carries a current of 60 mA. For a cell of emf 5 V and internal resistance of 20 Ω, the null point on it is found to be 1000 cm. The resistance of whole wire is:

The ratio of energy required to raise a satellite to a height h above the earth surface to that required to put into orbit is a) h:2Rb) 2h:Rc) R:hd) h:RBot these terms mean the same thing right? Then ratio should be 1:1?

In a biprism experiment, when sodium light of wavelength 5890 ∘A is used, then twenty fringes are observed in 23 mm distance on screen. In order to obtain 30 fringes in 28 mm of the interference pattern, one should use light of wavelength

The total energy of an electron in the ground state of the hydrogen atom is −13.6 eV. The kinetic energy of an electron in the first excited state is

Twelve resistors each of resistance r are connected together so that each lies along the edge of the cube as shown in the figure. The equivalent resistance between points 1 and 3 is

The dimensions of the base of a rectangular vessel are 60 cm × 45 cm. Its height is 20 cm. The vessel is half-filled with water. What should be the size of a solid iron cube which when dropped into the vessel will raise the water level up to the brim?

If a mass is moving with constant velocity along y axis then prove that its angular momentum about origin is zero

73. If momentum� of a particle becomes double then %age increase in its� K.E is

A charge of 10 esu is placed at a distance of 2 cm from a charge of 40 esu and 4 cm from another charge -20 esu. The potential energy of the 10 esu is ? ( in ergs )

For the given charge distribution on the ring, the net electric field at the centre of non-conducting ring is(Assume the part of ring in first and third quadrant is neutral, second quadrant is positively charged, fourth quadrant is negatively charged)

The momentum p (in kg m/s) of a particle is varying with time t ( in s) as p= 2+3t square. The force acting on the particle at t= 3 s will be??

Two masses, A and B, are fixed at both the ends of a light rod as shown in figure. There are two axis 00' and AA' about which the rod can be rotated. In which of the case the rotational inertia of the system will be more?

Application of convection, radiation, conduction

If f(x)=x2−1, then find fofof.

How the formation of stars are governed by the gravitational force?

An astronomical telescope has on objective of focal length 200 cm and an eye piece of focal length 4.0 cm. The telescope is focused to see an object 10 km from the objective. The final image is formed at infinity. Find the length of the tube and the angular magnification produced by the telescope.

A sphere of mass m is tied to end of a string of length l and rotated through the other end along a horizontal circular path with speed v. The work done in full horizontal circle is

The approximate value of magnetic field due to a dipole of magnetic moment 1.2 Am2 at a point 1 m away from it in a direction making an angle of 60∘ with the dipole axis is

long straight wire has linear charge density 4×10−9Cm−1 .the negative charge q = −5μC is at perpendicular distance 4cm from it, The force experienced By the charge is

Estimate the average thermal energy of a helium atom at (i) room temperature (27 °C), (ii) the temperature on the surface of the Sun (6000 K), (iii) the temperature of 10 million kelvin (the typical core temperature in the case of a star).

KE of an electron is E when incident wavelength is lambda. To increase the KE of the electron to 2E the incident wavelength must be

QHow much energy would be required by an electron while movingfrom ground state to third excited state of He^+ ion 1)40.8ev 2)51ev 3)10.2ev 4)48.35ev

How does condition change when air resistance is included for ball thrown up(formula for air resistance,equation of motion,graph etc)

Btw 2 stations a train accelerates uniformly at first then moves with constant speed and finally retards uniformly. If the ratios of time taken are 1:8:1 and the greatest spewd is 60km/h, find the average speed over the whole journey

Find the moment of inertia of a non-uniform rod having mass per unit length λ=λ0(1+xL) about an axis ⊥ to the length of the rod and passing through an end point L. Length of the rod is L and m is mass of the rod.

A positive charge is moving towards a person. The direction of magnetic field lines will be in:

In a transformer Np = 500, Ns = 5000. Input voltage is 20 V and frequency is 50 Hz. Then in the output, we have,

A cubical block rests on a plane of μ=√3. The angle through which the plane be inclined to the horizontal so that the block just slides down will be

A man of mass 50 kg stands on a frame of mass 30 kg. He pulls on a light rope which passes over a pulley. The other end of the rope is attached to the frame. For the system to be in equilibrium, what force must the man exert on the rope? (Take g=10 m/s2)

17.A coil of area 500 cm2 having 1000 turns is held perpendicular to a uniform magnetic field 0.4 G induced emf in the coil if it is turned through angle of 180^°in 1/10 sec is

Two small identical balls P and Q, each of mass √310 gram, carrying identical charges are suspended by threads of equal lengths. At equilibrium, they position themselves as shown in the figure, what is the charge on each ball ?.[ Given 14πϵ0=9×109 Nm2C−2 and take g=10 ms−2.]

Two objects of masses, 1×10−3 kg and 4×10−3 kg have equal momentum. What is the ratio of their kinetic energies?

Two blocks A and B of mass mA and mB respectively are kept in contact on a frictionless table. The experimenter pushes the block A from behind so that the block B, what is the force exerted by the experimenter on A ?

A particle moving in a straight line has velocity and displacement equation as v=4\sqrt{1+s} where v is in m/s and s is in m the initial velocity of the particle is

Which of following can not be polarised[Kerala PMT 2001]

Consider the situation shown in figure. The wire which has a mass of 4.00 g oscillates in its second harmonic and sets the air column in the tube into vibrations in its fundamental mode. Assuming that the speed of sound in air is 340 ms−1, find the tension in the wire.

Three rods are joined to form an equilateral triangle having side L. If each rod has m .find moment of inertia about an axis passing through centre of mass and perpendicular to plane of structure(by both perpendicular axis theorem and by parallel axis theorem).?

In a double slit experiment, when light of wavelength 400 nm was used, the angular width of the first minima formed on a screen placed im away, was found to be 0.2^°. What will be the angular width of the first minima, if the entire experimental apparatus immered in water

A uniformly charged ring has linear charge density 4Cm. What is the electric potential at its centre?

What is the value of sin 10° + sin 20° + sin 30° + ... + sin 360°

An electric dipole of dipole moment p is placed in the position of stable equilibrium in uniform electric field of intensity E. The potential energy of the electric dipole in the final position is.