50278 + Interview Questions in Physics

1.	2 gram of ice at zero degree celsius is mixed with 1 gram of steam at hundred degree Celsius find the temperature of the mixture.and also why we are getting 3g of H20in this problem.please explain
Answer» 2 gram of ice at zero degree celsius is mixed with 1 gram of steam at hundred degree Celsius find the temperature of the mixture.and also why we are getting 3g of H20in this problem.please explain

Discussion

2.	28.Two coils C1 and C2 are arranged coaxially as shown in the figure the ends of coil C2 are connected to an ammeter A. The current sent through coil C1 is directly proportional to the time. If magnetic field induction produced by the coil C1 is proportional to the current in it, then induced current through C2 is A) zero B) increasing with time C)constant D) decreasing with time
Answer» 28.Two coils C1 and C2 are arranged coaxially as shown in the figure the ends of coil C2 are connected to an ammeter A. The current sent through coil C1 is directly proportional to the time. If magnetic field induction produced by the coil C1 is proportional to the current in it, then induced current through C2 is A) zero B) increasing with time C)constant D) decreasing with time

Discussion

3.	Two boys having masses m1=4 kg and m2=2 kg are seating on a seesaw of length r=1 m as shown in figure. Find the net torque due to weight of boys, acting about the midpoint O.(Take g=10 m/s2 and anti-clock wise rotation as +ve)
Answer» Two boys having masses $m_{1} = 4 kg$ and $m_{2} = 2 kg$ are seating on a seesaw of length $r = 1 m$ as shown in figure. Find the net torque due to weight of boys, acting about the midpoint $O$ . (Take $g = 10 {m/s}^{2}$ and anti-clock wise rotation as $+ v e$ )

Discussion

4.	Two capacitors C1 and C2 are charged to 120V and 200V respectively. It is found that by connecting them together the potential on each one can be zero. Then A 3C1 + 5C2 = 0 B 9C1 + 4C2 = 0 C. 5C1=3C2 D 3C1=5C2
Answer» Two capacitors C1 and C2 are charged to 120V and 200V respectively. It is found that by connecting them together the potential on each one can be zero. Then A 3C1 + 5C2 = 0 B 9C1 + 4C2 = 0 C. 5C1=3C2 D 3C1=5C2

Discussion

5.	Two identical uniform discs roll without slipping on two different surfaces AB and CD starting at A and C with linear speed v1 and v2, respectively, and always remain in contact with the surfaces. If they reach B and D with the same linear speed and v1=3m/s then v2 in m/s is (g=10m/s2)
Answer» Two identical uniform discs roll without slipping on two different surfaces $A B$ and $C D$ starting at $A$ and $C$ with linear speed $v_{1}$ and $v_{2}$ , respectively, and always remain in contact with the surfaces. If they reach $B$ and $D$ with the same linear speed and $v_{1} = 3 m / s$ then $v_{2}$ in $m / s$ is $(g = 10 m / s^{2})$

Discussion

6.	For the given incident ray as shown in figure, the condition of total internal reflection of the ray will be satisfied, if the refractive index of block will b
Answer» For the given incident ray as shown in figure, the condition of total internal reflection of the ray will be satisfied, if the refractive index of block will b

Discussion

7.	Using differentials, find the approximate value of each of the following up to 3 places of decimal ? (26.57)13
Answer» Using differentials, find the approximate value of each of the following up to 3 places of decimal ? $(26.57)^{\frac{1}{3}}$

Discussion

8.	In YDSE, having slits of equal width, let β be the fringe width and Io be the maximum intensity. At a distance x from the central bright fringe, the intensity will be
Answer» In $YDSE$ , having slits of equal width, let $β$ be the fringe width and $I_{o}$ be the maximum intensity. At a distance $x$ from the central bright fringe, the intensity will be

Discussion

9.	A small block of mass1kg is at rest on a parabolic surface given by y=x^2.The coeff. of friction between block and surface is enough to prevent slipping. If position of block on surfaceis(2m,4m), the normal force that the surface exerts at this position is
Answer» A small block of mass1kg is at rest on a parabolic surface given by y=x^2.The coeff. of friction between block and surface is enough to prevent slipping. If position of block on surfaceis(2m,4m), the normal force that the surface exerts at this position is

Discussion

10.	5.Why the positive charge sticks to the belt when the air moves towards the needle in van de Graff generator?
Answer» 5.Why the positive charge sticks to the belt when the air moves towards the needle in van de Graff generator?

Discussion

11.	The coefficient of expansion of a crystal in one direction (x-axis) is 2.0×10−6 K−1 and that in the other two perpendicular directions (y and z-axes) is 1.6×10−6 K−1,What is the coefficient of cubical expansion of the crystal?
Answer» The coefficient of expansion of a crystal in one direction (x-axis) is $2.0 \times 10^{- 6} K^{- 1}$ and that in the other two perpendicular directions (y and z-axes) is $1.6 \times 10^{- 6} K^{- 1},$ What is the coefficient of cubical expansion of the crystal?

Discussion

12.	A tightly-wound, long solenoid is kept with its axis parallel to a large metal sheet carrying a surface current. The surface current through a width dl of the sheet is Kdl and the number of turns per unit length of the solenoid is n. The magnetic field near the centre of the solenoid is found to be zero. (a) Find the current in the solenoid. (b) If the solenoid is rotated to make its axis perpendicular to the metal sheet, what would be the magnitude of the magnetic field near its centre ?
Answer» A tightly-wound, long solenoid is kept with its axis parallel to a large metal sheet carrying a surface current. The surface current through a width dl of the sheet is Kdl and the number of turns per unit length of the solenoid is n. The magnetic field near the centre of the solenoid is found to be zero. (a) Find the current in the solenoid. (b) If the solenoid is rotated to make its axis perpendicular to the metal sheet, what would be the magnitude of the magnetic field near its centre ?

Discussion

13.	ntAn electon is moving in a circular path of radius r around infinite long charge having linesr charge density {lamda}.The time period of elecron is?n
Answer» ntAn electon is moving in a circular path of radius r around infinite long charge having linesr charge density {lamda}.The time period of elecron is?n

Discussion

14.	If r represents the radius of the orbit of a satellite of mass m moving around a planet of mass M, the velocity of the satellite is given by
Answer» If r represents the radius of the orbit of a satellite of mass m moving around a planet of mass M, the velocity of the satellite is given by

Discussion

15.	An object of relative density 0.8 is released from a height of 9 cm from the surface of water. At what depth inside the water its velocity becomes zero?
Answer» An object of relative density 0.8 is released from a height of 9 cm from the surface of water. At what depth inside the water its velocity becomes zero?

Discussion

16.	The number of turns in the coil of AC generator is 5000, and the area of the coil is 0.25 m2. The coil is rotated at the rate of 100 ( cycles / sec) in a magnetic field of 0.2 Wb m−2. The peak value of emf generated is nearly
Answer» The number of turns in the coil of AC generator is $5000$ , and the area of the coil is $0.25 m^{2}$ . The coil is rotated at the rate of $100 (cycles / sec)$ in a magnetic field of $0.2 {Wb m}^{- 2}$ . The peak value of emf generated is nearly

Discussion

17.	A projectile is fired horizontally from a gun that is 45.0 m above flat ground, it emerges from the gun with a speed of 500 m/s. (take, g = −10 m/s2) Column−I Column−II (i) Time of flight of Projectile in s (x)3 (ii) Horizontal distance covered by projectile in m (y)30 (iii) Magnitude of vertical component of velocity (z)1500 in m/s as it strikes ground
Answer» A projectile is fired horizontally from a gun that is 45.0 m above flat ground, it emerges from the gun with a speed of 500 m/s. (take, g = $- 10 m / s^{2}$ ) $C o l u m n - I C o l u m n - I I$ $(i) T i m e o f f l i g h t o f P r o j e c t i l e i n s (x) 3$ $(i i) H o r i z o n t a l d i s t a n c e c o v e r e d b y p r o j e c t i l e i n m (y) 30$ $(i i i) M a g n i t u d e o f v e r t i c a l c o m p o n e n t o f v e l o c i t y (z) 1500$ $i n m / s a s i t s t r i k e s g r o u n d$

17.

A projectile is fired horizontally from a gun that is 45.0 m above flat ground, it emerges from the gun with a speed of 500 m/s. (take, g = −10 m/s2) Column−I Column−II (i) Time of flight of Projectile in s (x)3 (ii) Horizontal distance covered by projectile in m (y)30 (iii) Magnitude of vertical component of velocity (z)1500 in m/s as it strikes ground

Answer»

A projectile is fired horizontally from a gun that is 45.0 m above flat ground, it emerges from the gun with a speed of 500 m/s. (take, g = $- 10 m / s^{2}$ )

$C o l u m n - I C o l u m n - I I$
$(i) T i m e o f f l i g h t o f P r o j e c t i l e i n s (x) 3$
$(i i) H o r i z o n t a l d i s t a n c e c o v e r e d b y p r o j e c t i l e i n m (y) 30$
$(i i i) M a g n i t u d e o f v e r t i c a l c o m p o n e n t o f v e l o c i t y (z) 1500$
$i n m / s a s i t s t r i k e s g r o u n d$

Discussion

18.	What angle does a vector make with the positive x-axis if it has a component of 80 units on the negative x-axis and 60 units on the positive y-axis?
Answer» What angle does a vector make with the positive x-axis if it has a component of 80 units on the negative x-axis and 60 units on the positive y-axis?

Discussion

19.	Two charges + 2 μ C and + 8 μ C are placed at two vertices of equilateral triangle of side 1m. The potential at third vertex of the triangle isOptions:90 x 10v9 x 10 V0.9 x 10 V900 x 10 V
Answer» Two charges + 2 μ C and + 8 μ C are placed at two vertices of equilateral triangle of side 1m. The potential at third vertex of the triangle isOptions:90 x 10v9 x 10 V0.9 x 10 V900 x 10 V

Discussion

20.	A particle oscillates about the equilibrium position x0 subject to a force that has an associated potential energy U(x). Which of the following statements about U(x) is/are true:
Answer» A particle oscillates about the equilibrium position $x_{0}$ subject to a force that has an associated potential energy U(x). Which of the following statements about U(x) is/are true:

Discussion

21.	A particle of mass M is released in vertical plane from a point P at x = x0 on the axis it falls verticallyalong the y-axis. Find the torque τ acting on the particle at a time t about origin?
Answer» A particle of mass M is released in vertical plane from a point P at $x$ = $x_{0}$ on the axis it falls vertically along the y-axis. Find the torque $τ$ acting on the particle at a time t about origin?

21.

A particle of mass M is released in vertical plane from a point P at x = x0 on the axis it falls verticallyalong the y-axis. Find the torque τ acting on the particle at a time t about origin?

Answer»

A particle of mass M is released in vertical plane from a point P at $x$ = $x_{0}$ on the axis it falls vertically

along the y-axis. Find the torque $τ$ acting on the particle at a time t about origin?

Discussion

22.	LCR series circuit is connected with an alternating emf source. If peak current and voltage are lo and Vo respectively then at resonance the value of wattless current is ,??
Answer» LCR series circuit is connected with an alternating emf source. If peak current and voltage are lo and Vo respectively then at resonance the value of wattless current is ,??

Discussion

23.	Explain magnetisation. Illustrate the way by which a piece of iron bar can be magnetised.
Answer» Explain magnetisation. Illustrate the way by which a piece of iron bar can be magnetised.

Discussion

24.	A vertical cylinder closed at both ends is fitted with a smooth piston dividing the volume into two parts each containing one mole of air. At the equilibrium temperature of 320 K, the upper and lower parts are in the ratio 4:1. The ratio will become 3:1 at atemperature of (a) 450 K (b) 228 K (c) 570 K(d) 420 K
Answer» A vertical cylinder closed at both ends is fitted with a smooth piston dividing the volume into two parts each containing one mole of air. At the equilibrium temperature of 320 K, the upper and lower parts are in the ratio 4:1. The ratio will become 3:1 at atemperature of (a) 450 K (b) 228 K (c) 570 K(d) 420 K

Discussion

25.	48.A sphere of radius 5cm has acharge of 31.41micro coulomb calculate the surface density of charge
Answer» 48.A sphere of radius 5cm has acharge of 31.41micro coulomb calculate the surface density of charge

Discussion

26.	A standard cell of emf E0=1.11 V is balanced against 72 cm length of a potentiometer. The same potentiometer is used to measure the potential difference across the standard resistance R=120 Ω. When the ammeter shows a current of 7.8 mA, a balanced length of 60 cm is obtained on the potentiometer. Estimate the percentage error in the measurement of ammeter:
Answer» A standard cell of emf $E_{0} = 1.11 V$ is balanced against $72 cm$ length of a potentiometer. The same potentiometer is used to measure the potential difference across the standard resistance $R = 120 Ω$ . When the ammeter shows a current of $7.8 mA$ , a balanced length of $60 cm$ is obtained on the potentiometer. Estimate the percentage error in the measurement of ammeter:

Discussion

27.	Ain't the net acceleration upwards when the lift is going up and deccelerating? or in other case Ain't the net acceleration downwards when the lift is going down and deccelerating? Then why do we feel our weight less and more respectively in the above cases? ( should not it be when the acc is up weight should be felt more than true weight and vice versa)
Answer» Ain't the net acceleration upwards when the lift is going up and deccelerating? or in other case Ain't the net acceleration downwards when the lift is going down and deccelerating? Then why do we feel our weight less and more respectively in the above cases? ( should not it be when the acc is up weight should be felt more than true weight and vice versa)

Discussion

28.	The magnetic field in a plane electromagnetic wave is given by B=(200μT)sin[(4.0×1015s−1)(t−xc)] Find the maximum electric field and the average energy density corresponding to the electric field.
Answer» The magnetic field in a plane electromagnetic wave is given by $B = (200 μ T) sin [(4.0 \times 10^{15} s^{- 1}) (t - \frac{x}{c})]$ Find the maximum electric field and the average energy density corresponding to the electric field.

Discussion

29.	Or 2 gram block attached to an ideal spring with spring constant of 18 Newton per metre oscillates on a horizontal frictionless surface in the spring is 4.0cm shorter than the its equilibrium Length speed of block is 17 metre per second a greater speed of block is 1.)4m/s 2
Answer» Or 2 gram block attached to an ideal spring with spring constant of 18 Newton per metre oscillates on a horizontal frictionless surface in the spring is 4.0cm shorter than the its equilibrium Length speed of block is 17 metre per second a greater speed of block is 1.)4m/s 2

Discussion

30.	Aparallel plate capacitor is to be designed with a voltage rating 1kV, using a material of dielectric constant 3 and dielectric strengthabout 107Vm−1.(Dielectric strength is the maximum electric field a material cantolerate without breakdown, i.e., without starting to conductelectricity through partial ionisation.) For safety, we should likethe field never to exceed, say 10% of the dielectric strength. Whatminimum area of the plates is required to have a capacitance of 50pF?
Answer» A parallel plate capacitor is to be designed with a voltage rating 1 kV, using a material of dielectric constant 3 and dielectric strength about 10⁷ Vm⁻¹. (Dielectric strength is the maximum electric field a material can tolerate without breakdown, i.e., without starting to conduct electricity through partial ionisation.) For safety, we should like the field never to exceed, say 10% of the dielectric strength. What minimum area of the plates is required to have a capacitance of 50 pF?

Discussion

31.	a circular hole of radius R/2 is cut off from a solid uniform disc of radius R. If the mass of the remaining portion is M , then the moment of inertia of the body about the axis through O and perpendicular to the plane of a disc is
Answer» a circular hole of radius R/2 is cut off from a solid uniform disc of radius R. If the mass of the remaining portion is M , then the moment of inertia of the body about the axis through O and perpendicular to the plane of a disc is

Discussion

32.	Light of wavelength λ=400nm falls on an isolated neutral metal ball of radius 1 m and work function 2.1 eV. Maximum number of photoelectrons that can be achieved from ball is n×107, then here n is (take hc = 1240 eV nm) .(Write upto two digits after the decimal point)
Answer» Light of wavelength $λ = 400 n m$ falls on an isolated neutral metal ball of radius 1 m and work function 2.1 $e V$ . Maximum number of photoelectrons that can be achieved from ball is $n \times 10^{7}$ , then here n is (take hc = 1240 eV nm) .(Write upto two digits after the decimal point)

Discussion

33.	A block A of mass m, rests on a horizontal table. A light string connected to it passes over a frictionless pulley at the edge of table and from its other end another block B of mass m, issuspended. The coefficient of kinetic friction between the block and table is u,. When the block A is sliding on the table, the tension in the string is it ques of package level 2 sec b q 13 of laws of motion
Answer» A block A of mass m, rests on a horizontal table. A light string connected to it passes over a frictionless pulley at the edge of table and from its other end another block B of mass m, is suspended. The coefficient of kinetic friction between the block and table is u,. When the block A is sliding on the table, the tension in the string is it ques of package level 2 sec b q 13 of laws of motion

Discussion

34.	A bullet of mass 5 g, travelling with a speed of 210 m/s, strikes a fixed wooden target. One half of its kinetic energy is converted into heat in the bullet while the other half is converted into heat in the wood. The rise of temperature of the bullet, if the specific heat of its material is 0.030 cal/(g°C) (1 cal=4.2×107 ergs) close to
Answer» A bullet of mass $5 g$ , travelling with a speed of $210 m/s$ , strikes a fixed wooden target. One half of its kinetic energy is converted into heat in the bullet while the other half is converted into heat in the wood. The rise of temperature of the bullet, if the specific heat of its material is $0.030 cal/(g°C)$ $(1 cal = 4.2 \times 10^{7} ergs$ ) close to

Discussion

35.	From a cylinder of radius R, a cylinder of radius R2 is removed as shown in the figure. The current flowing in the remaining portion of cylinder is I. Then magnetic field strength at point B is
Answer» From a cylinder of radius $R$ , a cylinder of radius $\frac{R}{2}$ is removed as shown in the figure. The current flowing in the remaining portion of cylinder is $I$ . Then magnetic field strength at point $B$ is

Discussion

36.	A short bar magnet placed in a horizontal plane has its axis alignedalong the magnetic north-south direction. Null points are found onthe axis of the magnet at 14 cm from the centre of the magnet. The earth’s magnetic field at the place is 0.36 G and the angle of dip iszero. What is the total magnetic field on the normal bisector of themagnet at the same distance as the null–point (i.e., 14 cm) from the centre of the magnet? (At null points, field due to a magnet is equal and opposite to the horizontal component of earth’s magnetic field.)
Answer» A short bar magnet placed in a horizontal plane has its axis alignedalong the magnetic north-south direction. Null points are found onthe axis of the magnet at 14 cm from the centre of the magnet. The earth’s magnetic field at the place is 0.36 G and the angle of dip iszero. What is the total magnetic field on the normal bisector of themagnet at the same distance as the null–point (i.e., 14 cm) from the centre of the magnet? (At null points, field due to a magnet is equal and opposite to the horizontal component of earth’s magnetic field.)

Discussion

37.	If charge on left plate of the 5μF capacitor in the circuit segment shown in the figure is −20μC, the charge on the right plate of 3μF capacitor is
Answer» If charge on left plate of the $5 μ F$ capacitor in the circuit segment shown in the figure is $- 20 μ C,$ the charge on the right plate of $3 μ F$ capacitor is

Discussion

38.	A particle of mass m is attached to three springs A, B and C of equal force constants k as shown in figure. if the particle is pushed slightly against the spring C and released, find the time period of oscillation.
Answer» A particle of mass m is attached to three springs A, B and C of equal force constants k as shown in figure. if the particle is pushed slightly against the spring C and released, find the time period of oscillation.

38.

A particle of mass m is attached to three springs A, B and C of equal force constants k as shown in figure. if the particle is pushed slightly against the spring C and released, find the time period of oscillation.

Answer»

A particle of mass m is attached to three springs A, B and C of equal force constants k as shown in figure. if the particle is pushed slightly against the spring C and released, find the time period of oscillation.

Discussion

39.	When a bicycle is in motion(without pendelling) the force of friction exerted by the ground on the two wheels act a) in the backward direction, on the front wheel and in the forward direction on the rear wheel. b) in the forward direction on the front wheel and in the backward direction on the rear wheel. c) in the backward direction, on both the front and the rear wheels. d) in the forward direction on the both front and the rer wheels.
Answer» When a bicycle is in motion(without pendelling) the force of friction exerted by the ground on the two wheels act a) in the backward direction, on the front wheel and in the forward direction on the rear wheel. b) in the forward direction on the front wheel and in the backward direction on the rear wheel. c) in the backward direction, on both the front and the rear wheels. d) in the forward direction on the both front and the rer wheels.

Discussion

40.	Magnetic field at point P at a distance d from vertex of infinite wire carrying current i as shown in figure is
Answer» Magnetic field at point P at a distance d from vertex of infinite wire carrying current $i$ as shown in figure is

Discussion

41.	A block of mass 2 kg is put on a rough horizontal surface having coefficient of friction 0.5. The acceleration of block and frictional force acting on block if F=7 N is (Take g=10 m/s2)
Answer» A block of mass $2 kg$ is put on a rough horizontal surface having coefficient of friction $0.5$ . The acceleration of block and frictional force acting on block if $F = 7 N$ is (Take $g = 10 {m/s}^{2}$ )

Discussion

42.	45.When a circular coil is placed in a uniform magnetic field of induction 7.5 T and is removed from it in 0.02s then an emf of 7.5v is induced in the coil.Find the area of the coil.
Answer» 45.When a circular coil is placed in a uniform magnetic field of induction 7.5 T and is removed from it in 0.02s then an emf of 7.5v is induced in the coil.Find the area of the coil.

Discussion

43.	How MASS can change according to velocity?
Answer» How MASS can change according to velocity?

Discussion

44.	A current loop in a magnetic field:
Answer» A current loop in a magnetic field:

Discussion

45.	A meter gauge (MG) section has a ruling gradient of 1 in 200 and has a 4∘ curve. The allowable ruling gradient is 1 in _____________ .263.16
Answer» A meter gauge (MG) section has a ruling gradient of 1 in 200 and has a $4^{\circ}$ curve. The allowable ruling gradient is 1 in _____________ . 263.16

Discussion

46.	If ωωn is very high for a body vibrating under steady state vibration, the phase angle for all values of damping factors will tend to approach
Answer» $If \frac{ω}{ω_{n}} is very high for a body vibrating under steady state vibration, the phase angle for all values of damping factors will tend to approach$

Discussion

47.	Question 6What is the maximum resistance which can be made using five resistors each of 15Ω?(a) 15Ω(b) 10 Ω(c) 5 Ω(d) 1 Ω
Answer» Question 6 What is the maximum resistance which can be made using five resistors each of $\frac{1}{5} Ω$ ? (a) $\frac{1}{5} Ω$ (b) $10 Ω$ (c) $5 Ω$ (d) $1 Ω$

Discussion

48.	In a rectangular coordinate system a charge of 25 x 10^-9 C is placed at the origin of coordinates, and a charge of 25 x 10^-9 C is placed at a point x=6 cm, y=0. What is the electric field at (a) x=3m, y=0m (b) x=3m, y=4m?
Answer» In a rectangular coordinate system a charge of 25 x 10^-9 C is placed at the origin of coordinates, and a charge of 25 x 10^-9 C is placed at a point x=6 cm, y=0. What is the electric field at (a) x=3m, y=0m (b) x=3m, y=4m?

Discussion

49.	A piece of wood of mass 0.03 kg is dropped from the top of a 100 m height building. At the same time, a bullet of mass 0.02 kg is fired vertically upward, with a velocity 100 ms−1, from the ground. The bullet gets embedded in the wood. Then the maximum height to which the combined system reaches above the top of the building before falling below is: (g=10 ms−2)
Answer» A piece of wood of mass $0.03 kg$ is dropped from the top of a $100 m$ height building. At the same time, a bullet of mass $0.02 kg$ is fired vertically upward, with a velocity $100 {ms}^{- 1}$ , from the ground. The bullet gets embedded in the wood. Then the maximum height to which the combined system reaches above the top of the building before falling below is: $(g = 10 {ms}^{- 2}$ )

Discussion

50.	A force acts on a 3 gm particle in such a way that the position of the particle as a function of time is given by x=3t−4t2+t3, where x is in metres and t is in seconds. The work done during the first 4 second is
Answer» A force acts on a $3 gm$ particle in such a way that the position of the particle as a function of time is given by $x = 3 t - 4 t^{2} + t^{3},$ where $x$ is in metres and $t$ is in seconds. The work done during the first $4$ second is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

2 gram of ice at zero degree celsius is mixed with 1 gram of steam at hundred degree Celsius find the temperature of the mixture.and also why we are getting 3g of H20in this problem.please explain

Two boys having masses m1=4 kg and m2=2 kg are seating on a seesaw of length r=1 m as shown in figure. Find the net torque due to weight of boys, acting about the midpoint O.(Take g=10 m/s2 and anti-clock wise rotation as +ve)

Two capacitors C1 and C2 are charged to 120V and 200V respectively. It is found that by connecting them together the potential on each one can be zero. Then A 3C1 + 5C2 = 0 B 9C1 + 4C2 = 0 C. 5C1=3C2 D 3C1=5C2

Two identical uniform discs roll without slipping on two different surfaces AB and CD starting at A and C with linear speed v1 and v2, respectively, and always remain in contact with the surfaces. If they reach B and D with the same linear speed and v1=3m/s then v2 in m/s is (g=10m/s2)

For the given incident ray as shown in figure, the condition of total internal reflection of the ray will be satisfied, if the refractive index of block will b

Using differentials, find the approximate value of each of the following up to 3 places of decimal ? (26.57)13

In YDSE, having slits of equal width, let β be the fringe width and Io be the maximum intensity. At a distance x from the central bright fringe, the intensity will be

A small block of mass1kg is at rest on a parabolic surface given by y=x^2.The coeff. of friction between block and surface is enough to prevent slipping. If position of block on surfaceis(2m,4m), the normal force that the surface exerts at this position is

5.Why the positive charge sticks to the belt when the air moves towards the needle in van de Graff generator?

The coefficient of expansion of a crystal in one direction (x-axis) is 2.0×10−6 K−1 and that in the other two perpendicular directions (y and z-axes) is 1.6×10−6 K−1,What is the coefficient of cubical expansion of the crystal?

ntAn electon is moving in a circular path of radius r around infinite long charge having linesr charge density {lamda}.The time period of elecron is?n

If r represents the radius of the orbit of a satellite of mass m moving around a planet of mass M, the velocity of the satellite is given by

An object of relative density 0.8 is released from a height of 9 cm from the surface of water. At what depth inside the water its velocity becomes zero?

The number of turns in the coil of AC generator is 5000, and the area of the coil is 0.25 m2. The coil is rotated at the rate of 100 ( cycles / sec) in a magnetic field of 0.2 Wb m−2. The peak value of emf generated is nearly

What angle does a vector make with the positive x-axis if it has a component of 80 units on the negative x-axis and 60 units on the positive y-axis?

Two charges + 2 μ C and + 8 μ C are placed at two vertices of equilateral triangle of side 1m. The potential at third vertex of the triangle isOptions:90 x 10v9 x 10 V0.9 x 10 V900 x 10 V

A particle oscillates about the equilibrium position x0 subject to a force that has an associated potential energy U(x). Which of the following statements about U(x) is/are true:

A particle of mass M is released in vertical plane from a point P at x = x0 on the axis it falls verticallyalong the y-axis. Find the torque τ acting on the particle at a time t about origin?

LCR series circuit is connected with an alternating emf source. If peak current and voltage are lo and Vo respectively then at resonance the value of wattless current is ,??

Explain magnetisation. Illustrate the way by which a piece of iron bar can be magnetised.

48.A sphere of radius 5cm has acharge of 31.41micro coulomb calculate the surface density of charge

The magnetic field in a plane electromagnetic wave is given by B=(200μT)sin[(4.0×1015s−1)(t−xc)] Find the maximum electric field and the average energy density corresponding to the electric field.

Or 2 gram block attached to an ideal spring with spring constant of 18 Newton per metre oscillates on a horizontal frictionless surface in the spring is 4.0cm shorter than the its equilibrium Length speed of block is 17 metre per second a greater speed of block is 1.)4m/s 2

a circular hole of radius R/2 is cut off from a solid uniform disc of radius R. If the mass of the remaining portion is M , then the moment of inertia of the body about the axis through O and perpendicular to the plane of a disc is

Light of wavelength λ=400nm falls on an isolated neutral metal ball of radius 1 m and work function 2.1 eV. Maximum number of photoelectrons that can be achieved from ball is n×107, then here n is (take hc = 1240 eV nm) .(Write upto two digits after the decimal point)

From a cylinder of radius R, a cylinder of radius R2 is removed as shown in the figure. The current flowing in the remaining portion of cylinder is I. Then magnetic field strength at point B is

If charge on left plate of the 5μF capacitor in the circuit segment shown in the figure is −20μC, the charge on the right plate of 3μF capacitor is

A particle of mass m is attached to three springs A, B and C of equal force constants k as shown in figure. if the particle is pushed slightly against the spring C and released, find the time period of oscillation.

Magnetic field at point P at a distance d from vertex of infinite wire carrying current i as shown in figure is

A block of mass 2 kg is put on a rough horizontal surface having coefficient of friction 0.5. The acceleration of block and frictional force acting on block if F=7 N is (Take g=10 m/s2)

45.When a circular coil is placed in a uniform magnetic field of induction 7.5 T and is removed from it in 0.02s then an emf of 7.5v is induced in the coil.Find the area of the coil.

How MASS can change according to velocity?

A current loop in a magnetic field:

A meter gauge (MG) section has a ruling gradient of 1 in 200 and has a 4∘ curve. The allowable ruling gradient is 1 in _____________ .263.16

If ωωn is very high for a body vibrating under steady state vibration, the phase angle for all values of damping factors will tend to approach

Question 6What is the maximum resistance which can be made using five resistors each of 15Ω?(a) 15Ω(b) 10 Ω(c) 5 Ω(d) 1 Ω

In a rectangular coordinate system a charge of 25 x 10^-9 C is placed at the origin of coordinates, and a charge of 25 x 10^-9 C is placed at a point x=6 cm, y=0. What is the electric field at (a) x=3m, y=0m (b) x=3m, y=4m?

A force acts on a 3 gm particle in such a way that the position of the particle as a function of time is given by x=3t−4t2+t3, where x is in metres and t is in seconds. The work done during the first 4 second is