50278 + Interview Questions in Physics

1.	The initial speed of bullet fires from a rifle is 630m /s . The rifle is fired at the centre of a target 700m away at the same level as the target. How far above the centre of the target the rifle must be aimed in order to hit the target
Answer» The initial speed of bullet fires from a rifle is 630m /s . The rifle is fired at the centre of a target 700m away at the same level as the target. How far above the centre of the target the rifle must be aimed in order to hit the target

Discussion

2.	Q 13/30 Two spheres each of mass 104 kg areseparated by a distance of 100 m. What will be thegravitational potential energy of the system?-6.67 x 10-6 J-6.67 x 10+5 J- 6.67 x 10-5 J-6.67 x 106 JX
Answer» Q 13/30 Two spheres each of mass 104 kg areseparated by a distance of 100 m. What will be thegravitational potential energy of the system?-6.67 x 10-6 J-6.67 x 10+5 J- 6.67 x 10-5 J-6.67 x 106 JX

Discussion

3.	An inductor 1H a capacitor 1microfarad and a resistor of 100 ohm is connected in series with an alternating voltage of emf 50sinomegat . The power dissipated will be half of its maximum value at omega=?
Answer» An inductor 1H a capacitor 1microfarad and a resistor of 100 ohm is connected in series with an alternating voltage of emf 50sinomegat . The power dissipated will be half of its maximum value at omega=?

Discussion

4.	The mathematical tool that we use to find the change in velocity from a function of acceleration w.r.t time is
Answer» The mathematical tool that we use to find the change in velocity from a function of acceleration w.r.t time is

Discussion

5.	The ratio of the radii of gyration of a circular disc to that of a circular ring, each of same mass and radius, around their respective axes is
Answer» The ratio of the radii of gyration of a circular disc to that of a circular ring, each of same mass and radius, around their respective axes is

Discussion

6.	Effective capacitance of parallel combination of two capacitors C1 and C2 is 10 μF. When these capacitors are individually connected to a voltage source of 1 V, the energy stored in the capacitor C2 is 4 times that of C1. If these capacitors are connected in series, their effective capacitance will be:
Answer» Effective capacitance of parallel combination of two capacitors $C_{1}$ and $C_{2}$ is $10 μ F$ . When these capacitors are individually connected to a voltage source of $1 V$ , the energy stored in the capacitor $C_{2}$ is $4$ times that of $C_{1}$ . If these capacitors are connected in series, their effective capacitance will be:

Discussion

7.	A boy reaches the airport and finds that the escalator is not working. He walks up the stationary escalator in time t1. If he remains stationary on a moving escalator, then the escalator takes him up in time t2. The time taken by him to walk up on the moving escalator will be:
Answer» A boy reaches the airport and finds that the escalator is not working. He walks up the stationary escalator in time $t_{1}$ . If he remains stationary on a moving escalator, then the escalator takes him up in time $t_{2}$ . The time taken by him to walk up on the moving escalator will be:

Discussion

8.	A stone of mass 0.25 kg tied to the end of a string is whirled round in a circle of radius 1.5 m with a speed of 40 rev./min in a horizontal plane. What is the tension in the string ? What is the maximum speed with which the stone can be whirled around if the string can withstand a maximum tension of 200 N ?
Answer» A stone of mass 0.25 kg tied to the end of a string is whirled round in a circle of radius 1.5 m with a speed of 40 rev./min in a horizontal plane. What is the tension in the string ? What is the maximum speed with which the stone can be whirled around if the string can withstand a maximum tension of 200 N ?

Discussion

9.	A small object stuck on the surface of a glass sphere (n=1.5) is viewed from the diametrically opposite position. Find transverse magnification if the surrounding medium is air.
Answer» A small object stuck on the surface of a glass sphere $(n = 1.5)$ is viewed from the diametrically opposite position. Find transverse magnification if the surrounding medium is air.

Discussion

10.	Two point charges q1 and q2 of magnitude 10 raise to -8C and -10 raise to -8C, respectively are placed 0.1m apart. Calculate the electric field at point A B and C as shown in figure.
Answer» Two point charges q1 and q2 of magnitude 10 raise to -8C and -10 raise to -8C, respectively are placed 0.1m apart. Calculate the electric field at point A B and C as shown in figure.

Discussion

11.	A mass of 50 kg is suspended from a spring of stiffness 10 kN/m. It is set into oscillations and it is observed that two successive oscillations have amplitudes 10 mm and 1 mm. Determine the damping ratio.
Answer» A mass of $50 kg$ is suspended from a spring of stiffness $10 kN/m$ . It is set into oscillations and it is observed that two successive oscillations have amplitudes $10 mm$ and $1 mm$ . Determine the damping ratio.

Discussion

12.	In hexagonal system of crystals, a frequently encountered arrangement of atoms is described as a hexagonal prism. Here, the top and bottom of the cell arc regular hexagons and three atoms are sandwiched between them. A space-filling model of this structure, called hexagonal close packed (hcp), is constituted of a sphere on a flat surface surrounded in the same plane by six identical spheres as closely as possible. Three spheres are then placed over the first layer so that they touch each other and represent the second layer. Each one of these three spheres touches three spheres of the bottom layer. Finally, the second layer is covered with a third layer that is identical to the bottom layer in relative position. Assume radius of every sphere to be 'r'.The empty space in this hcp unit cell is:
Answer» In hexagonal system of crystals, a frequently encountered arrangement of atoms is described as a hexagonal prism. Here, the top and bottom of the cell arc regular hexagons and three atoms are sandwiched between them. A space-filling model of this structure, called hexagonal close packed (hcp), is constituted of a sphere on a flat surface surrounded in the same plane by six identical spheres as closely as possible. Three spheres are then placed over the first layer so that they touch each other and represent the second layer. Each one of these three spheres touches three spheres of the bottom layer. Finally, the second layer is covered with a third layer that is identical to the bottom layer in relative position. Assume radius of every sphere to be 'r'. The empty space in this hcp unit cell is:

Discussion

13.	1.Why is sound a longitudinal wave?
Answer» 1.Why is sound a longitudinal wave?

Discussion

14.	Number of moles of electrons present in 34 g of NH3 is:
Answer» Number of moles of electrons present in 34 g of $N H_{3}$ is:

Discussion

15.	In Young's double-slit experiment with slit separation 0.1 m, one observes a bright fringe at angle 1/40 rad by using the light of wavelength λ1. When the light of wavelength λ2 is used a bright fringe is seen at the same angle in the same setup. Given that λ1 and λ2 are in the visible range (380 nm to 740 nm), their values are
Answer» In Young's double-slit experiment with slit separation $0.1 m$ , one observes a bright fringe at angle $1 / 40 rad$ by using the light of wavelength $λ_{1}$ . When the light of wavelength $λ_{2}$ is used a bright fringe is seen at the same angle in the same setup. Given that $λ_{1}$ and $λ_{2}$ are in the visible range $(380 nm$ to $740 nm)$ , their values are

Discussion

16.	What is the velocity of electron ejected between two parallel plate of opposite charge when it hits the plate?what is angle of divergence?
Answer» What is the velocity of electron ejected between two parallel plate of opposite charge when it hits the plate?what is angle of divergence?

Discussion

17.	Q. A swimmer going down stream in a river overtakes a floating body at some point A he continues for 2hrs and then return back and again meets a floating body at point B which is 18kms far from point A downstream. Then find the velocity of riverflow
Answer» Q. A swimmer going down stream in a river overtakes a floating body at some point A he continues for 2hrs and then return back and again meets a floating body at point B which is 18kms far from point A downstream. Then find the velocity of riverflow

Discussion

18.	A parallel capacitor is maintained at a certain potential difference. When a 3mm thick slab is introduced between the plates in order to maintain the same potential difference, the distance between the plates is increased by 2.4mm. Find dielectric constant of slab.
Answer» A parallel capacitor is maintained at a certain potential difference. When a 3mm thick slab is introduced between the plates in order to maintain the same potential difference, the distance between the plates is increased by 2.4mm. Find dielectric constant of slab.

Discussion

19.	What is the real dimension and value of G.
Answer» What is the real dimension and value of G.

Discussion

20.	A charge Q is distributed uniformly within the material of a hollow sphere of inner and outer radii r1 and r2. Find the electric field at a point P at a distance x away from the centre for r1 < x < r. Draw a rough graph showing the electric field as a function of x for 0 < x < 2r2.explain que step by step
Answer» A charge Q is distributed uniformly within the material of a hollow sphere of inner and outer radii r1 and r2. Find the electric field at a point P at a distance x away from the centre for r1 < x < r. Draw a rough graph showing the electric field as a function of x for 0 < x < 2r2. explain que step by step

Discussion

21.	To study the dependence of current (I) on the potential difference (V) across a resistor, the correct way of connecting the ammeter and voltmeter in the circuit is:(1) ammeter and voltmeter both are connected in series(2) ammeter is connected in parallel and voltmeter in series(3) ammeter is connected in series and voltmeter in parallel(4) ammeter and voltmeter both are connected in parallel
Answer» To study the dependence of current (I) on the potential difference (V) across a resistor, the correct way of connecting the ammeter and voltmeter in the circuit is: (1) ammeter and voltmeter both are connected in series (2) ammeter is connected in parallel and voltmeter in series (3) ammeter is connected in series and voltmeter in parallel (4) ammeter and voltmeter both are connected in parallel

Discussion

22.	Figure (8-E14) shows a light rod of length I rigidly attached to a small heavy block at one end and a hook at the other end. The system is released from rest with the rod in a horizontal position. There is a fixed smooth ring at a depth h below the initial position of the hook and the hook gets into the ring as it reaches there. What should be the minimum value of h so that the block moves in a complete circle about the ring ?
Answer» Figure (8-E14) shows a light rod of length I rigidly attached to a small heavy block at one end and a hook at the other end. The system is released from rest with the rod in a horizontal position. There is a fixed smooth ring at a depth h below the initial position of the hook and the hook gets into the ring as it reaches there. What should be the minimum value of h so that the block moves in a complete circle about the ring ?

22.

Figure (8-E14) shows a light rod of length I rigidly attached to a small heavy block at one end and a hook at the other end. The system is released from rest with the rod in a horizontal position. There is a fixed smooth ring at a depth h below the initial position of the hook and the hook gets into the ring as it reaches there. What should be the minimum value of h so that the block moves in a complete circle about the ring ?

Answer»

Figure (8-E14) shows a light rod of length I rigidly attached to a small heavy block at one end and a hook at the other end. The system is released from rest with the rod in a horizontal position. There is a fixed smooth ring at a depth h below the initial position of the hook and the hook gets into the ring as it reaches there. What should be the minimum value of h so that the block moves in a complete circle about the ring ?

Discussion

23.	A simple pendulum has some time period T. What will be the percentage change in its time period if its amplitude is decreased by 5 %?
Answer» A simple pendulum has some time period T. What will be the percentage change in its time period if its amplitude is decreased by 5 %?

Discussion

24.	63 On increasing the number of turns of coil in a moving coil galvanometer (1) current sensitivity increases (2) current sensitivity decreases (3) voltage sensitivity increases (4) voltage sensitivity decreases
Answer» 63 On increasing the number of turns of coil in a moving coil galvanometer (1) current sensitivity increases (2) current sensitivity decreases (3) voltage sensitivity increases (4) voltage sensitivity decreases

Discussion

25.	A single conservative force F(x) acts on a 2.5 kg particle that moves along x−axis. The potential energy U(x) is given by U(x)=(10+(x−4)2) where x is in meter. At x=6 m, The particle has kinetic energy of 20 J. What is mechanical energy of the system?
Answer» A single conservative force $F (x)$ acts on a $2.5 kg$ particle that moves along $x -$ axis. The potential energy $U (x)$ is given by $U (x) = (10 + (x - 4)^{2})$ where $x$ is in meter. At $x = 6 m$ , The particle has kinetic energy of $20 J$ . What is mechanical energy of the system?

Discussion

26.	184 The phase difference between current and voltage in an A.C circuit is 45radian. If the frequency of A.C Circuit is 50H.z then phase difference is equivalent to time difference of?
Answer» 184 The phase difference between current and voltage in an A.C circuit is 45radian. If the frequency of A.C Circuit is 50H.z then phase difference is equivalent to time difference of?

Discussion

27.	How milican calculate the charge of electrons by his oil drop experiment
Answer» How milican calculate the charge of electrons by his oil drop experiment

Discussion

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

Discussion

29.	By what percentage should the pressure of a given mass of gas be increased so as to decrease its volume by 10% at a constant temperature?
Answer» By what percentage should the pressure of a given mass of gas be increased so as to decrease its volume by 10 $%$ at a constant temperature?

Discussion

30.	A plane is flying horizontally at 98 m/s and releasesan object which reaches the ground in 10 s. Theangle made by it while hitting the ground is :
Answer» A plane is flying horizontally at 98 m/s and releasesan object which reaches the ground in 10 s. Theangle made by it while hitting the ground is :

Discussion

31.	A body of mass 20kg is thrown up with a velocity of 20m/s . Find the PE of the body at the highest point .
Answer» A body of mass 20kg is thrown up with a velocity of 20m/s . Find the PE of the body at the highest point .

Discussion

32.	A current loop having two circular arcs joined by two radial line as shown in figure. It carries a current of 10 A. The magnetic field at point O will be close to
Answer» A current loop having two circular arcs joined by two radial line as shown in figure. It carries a current of $10 A$ . The magnetic field at point $O$ will be close to

Discussion

33.	A sample of 0.1 g of water at 100∘C and normal pressure (1.03×105 Nm−2) requires 54 cal of heat energy to convert to steam at 100∘C. If the volume of the steam produced is 167.1 cc, the change in internal energy of the sample is
Answer» A sample of $0.1 g$ of water at $100^{\circ} C$ and normal pressure $(1.03 \times 10^{5} {Nm}^{- 2})$ requires $54 cal$ of heat energy to convert to steam at $100^{\circ} C$ . If the volume of the steam produced is $167.1 cc$ , the change in internal energy of the sample is

Discussion

34.	A and B are two equipotential surfaces . A charge of 2 μC is shot from origin with 102 m/s. Find work done by the field on the charge to cross the field. If field extends upto 20 cm in Y axis. [Given \|V1 – V2\| = 103 V ]
Answer» A and B are two equipotential surfaces . A charge of 2 μC is shot from origin with 102 m/s. Find work done by the field on the charge to cross the field. If field extends upto 20 cm in Y axis. [Given \|V1 – V2\| = 103 V ]

Discussion

35.	(4) 014,) A conducting circular loop is placed in a uniformmagnetic field, B = 0.025 T with its planeperpendicular to the loop. The radius of the loop ismade to shrink at a constant rate of 1 mms-1. Theinduced emf when the radius is 2 cm is\lbrack AIPMT (Prelims)-2010\rbrack(1) 2μ (2) 2(4) 2uV5. A conducting circular loop is placed in a unifornmnatic field 0 04 T with its plane perpendicula
Answer» (4) 014,) A conducting circular loop is placed in a uniformmagnetic field, B = 0.025 T with its planeperpendicular to the loop. The radius of the loop ismade to shrink at a constant rate of 1 mms-1. Theinduced emf when the radius is 2 cm is\lbrack AIPMT (Prelims)-2010\rbrack(1) 2μ (2) 2(4) 2uV5. A conducting circular loop is placed in a unifornmnatic field 0 04 T with its plane perpendicula

Discussion

36.	The potential energy of a particle of mass 1 kgalong x-axis is U= 5(1- cos3x)J. The time periodof small oscillation is2т(2)3 5(1) 2T/53/5(3)2TTC(4)2/5
Answer» The potential energy of a particle of mass 1 kgalong x-axis is U= 5(1- cos3x)J. The time periodof small oscillation is2т(2)3 5(1) 2T/53/5(3)2TTC(4)2/5

Discussion

37.	A photographic flash unit consists of a xenon-filled tube. It gives a flash of average power 2000 W for 0.04 s. The flash is due to discharge of a fully charged capacitor of 40 μF. The voltage to which it is charged before a flash is given by the unit is
Answer» A photographic flash unit consists of a xenon-filled tube. It gives a flash of average power $2000 W$ for $0.04 s$ . The flash is due to discharge of a fully charged capacitor of $40 μ F$ . The voltage to which it is charged before a flash is given by the unit is

Discussion

38.	More than One Answer Typeएक से अधिक उत्तर प्रकार के प्रश्नValue of currents I and I1 shown in figure areचित्र में दर्शायी गयी धाराओं I तथा I1 के मान हैं
Answer» More than One Answer Type एक से अधिक उत्तर प्रकार के प्रश्न Value of currents I and I₁ shown in figure are चित्र में दर्शायी गयी धाराओं I तथा I₁ के मान हैं

Discussion

39.	Two uniform thin rods each of length L and mass m are joined as shown in the figure.Find the dis†an ce of centre of mass of the system from point O
Answer» Two uniform thin rods each of length L and mass m are joined as shown in the figure.Find the dis†an ce of centre of mass of the system from point O

Discussion

40.	Find the derivative of px2+qx+rax+b where p,q,r,a,b are fixed non-zero constants.
Answer» Find the derivative of $\frac{p x^{2} + q x + r}{a x + b}$ where $p, q, r, a, b$ are fixed non-zero constants.

Discussion

41.	A particle of mass m moves along the quarter section of the circular path whose center is the origin. The radius of the circular path is a. A force F=¯F=y^i−x^j N acts on the particle where x and y denote the coordinates of the position of the particle. The work done by this force in taking the particle from point A (a, 0) to point B (0, a) along the circular path is
Answer» A particle of mass m moves along the quarter section of the circular path whose center is the origin. The radius of the circular path is a. A force $F = ¯ F = y^i - x^j N$ acts on the particle where x and y denote the coordinates of the position of the particle. The work done by this force in taking the particle from point A (a, 0) to point B (0, a) along the circular path is

41.

A particle of mass m moves along the quarter section of the circular path whose center is the origin. The radius of the circular path is a. A force F=¯F=y^i−x^j N acts on the particle where x and y denote the coordinates of the position of the particle. The work done by this force in taking the particle from point A (a, 0) to point B (0, a) along the circular path is

Answer»

A particle of mass m moves along the quarter section of the circular path whose center is the origin. The radius of the circular path is a. A force $F = ¯ F = y^i - x^j N$ acts on the particle where x and y denote the coordinates of the position of the particle. The work done by this force in taking the particle from point A (a, 0) to point B (0, a) along the circular path is

Discussion

42.	A 2V battery is connected across the points A and B as shown in the figure given below. Assuming that the resistance of each diode is zero in forward bias and infinity in reverse bias, the current supplied by the battery when its positive terminal is connected to A is
Answer» A 2V battery is connected across the points A and B as shown in the figure given below. Assuming that the resistance of each diode is zero in forward bias and infinity in reverse bias, the current supplied by the battery when its positive terminal is connected to A is

42.

A 2V battery is connected across the points A and B as shown in the figure given below. Assuming that the resistance of each diode is zero in forward bias and infinity in reverse bias, the current supplied by the battery when its positive terminal is connected to A is

Answer»

A 2V battery is connected across the points A and B as shown in the figure given below. Assuming that the resistance of each diode is zero in forward bias and infinity in reverse bias, the current supplied by the battery when its positive terminal is connected to A is

Discussion

43.	When a certain metallic surface is illuminated with monochromatic light of wavelength λ, the stopping potential 4.5 V. When it is illuminated with light of wave length 2λ, the stopping potential is 1.5 V. The maximum wavelength of incident light that can release photo electrons from this surface is-
Answer» When a certain metallic surface is illuminated with monochromatic light of wavelength $λ,$ the stopping potential $4.5 V .$ When it is illuminated with light of wave length $2 λ,$ the stopping potential is $1.5 V .$ The maximum wavelength of incident light that can release photo electrons from this surface is-

Discussion

44.	A block of mass 5 kg is on a rough horizontal surface and is at rest. Now a force of 24 N is imparted to it with negligible impulse. If the coefficient of kinetic friction is 0.4 and g=9.8 m/s2, then the acceleration of the block is
Answer» A block of mass $5 k g$ is on a rough horizontal surface and is at rest. Now a force of $24 N$ is imparted to it with negligible impulse. If the coefficient of kinetic friction is $0.4$ and $g = 9.8 {m/s}^{2}$ , then the acceleration of the block is

Discussion

45.	An incompressible fluid is flowing in a cylindrical pipe of internal diameter 4 cm with a velocity of 5 m/s. If this tube is joined with another tube of internal diameter 2 cm, then the velocity of flow of fluid in the smaller tube will be
Answer» An incompressible fluid is flowing in a cylindrical pipe of internal diameter $4 c m$ with a velocity of $5 m / s$ . If this tube is joined with another tube of internal diameter $2 c m$ , then the velocity of flow of fluid in the smaller tube will be

Discussion

46.	For infinite rod placed at some distance on at point axial position what is value of electric dield have charge density lambda
Answer» For infinite rod placed at some distance on at point axial position what is value of electric dield have charge density lambda

Discussion

47.	a car accelerates uniformly and its velocity changes from5m/s to 30 m/s in time't'find its average velocity. Need proper calculation
Answer» a car accelerates uniformly and its velocity changes from5m/s to 30 m/s in time't'find its average velocity. Need proper calculation

Discussion

48.	A bowler bowled a ball of mass 0.2 kg at a speed of 162 km/h. The batsman played a defensive shot and the ball came to rest after striking the bat. If the contact between the ball and the bat is for 0.015 s, find the magnitude of the impulsive force applied by the bat on the ball.
Answer» A bowler bowled a ball of mass $0.2 kg$ at a speed of $162 km/h$ . The batsman played a defensive shot and the ball came to rest after striking the bat. If the contact between the ball and the bat is for $0.015 s$ , find the magnitude of the impulsive force applied by the bat on the ball.

Discussion

49.	A mark is made on the bottom of a beaker and a microscope is focused on it . The microscope is raised through 1.5 cm . To what height water must be poured into the beaker to bring the mark again into focus ? Given that 'n' is 4/3
Answer» A mark is made on the bottom of a beaker and a microscope is focused on it . The microscope is raised through 1.5 cm . To what height water must be poured into the beaker to bring the mark again into focus ? Given that 'n' is 4/3

Discussion

50.	A line of force originates from a charge q1 at an angle α and terminates at a charge −q2 at an angle β. The value of beta in terms of α is:
Answer» A line of force originates from a charge $q_{1}$ at an angle $α$ and terminates at a charge $- q_{2}$ at an angle $β$ . The value of $b e t a$ in terms of $α$ is:

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The initial speed of bullet fires from a rifle is 630m /s . The rifle is fired at the centre of a target 700m away at the same level as the target. How far above the centre of the target the rifle must be aimed in order to hit the target

Q 13/30 Two spheres each of mass 104 kg areseparated by a distance of 100 m. What will be thegravitational potential energy of the system?-6.67 x 10-6 J-6.67 x 10+5 J- 6.67 x 10-5 J-6.67 x 106 JX

An inductor 1H a capacitor 1microfarad and a resistor of 100 ohm is connected in series with an alternating voltage of emf 50sinomegat . The power dissipated will be half of its maximum value at omega=?

The mathematical tool that we use to find the change in velocity from a function of acceleration w.r.t time is

The ratio of the radii of gyration of a circular disc to that of a circular ring, each of same mass and radius, around their respective axes is

A boy reaches the airport and finds that the escalator is not working. He walks up the stationary escalator in time t1. If he remains stationary on a moving escalator, then the escalator takes him up in time t2. The time taken by him to walk up on the moving escalator will be:

A small object stuck on the surface of a glass sphere (n=1.5) is viewed from the diametrically opposite position. Find transverse magnification if the surrounding medium is air.

Two point charges q1 and q2 of magnitude 10 raise to -8C and -10 raise to -8C, respectively are placed 0.1m apart. Calculate the electric field at point A B and C as shown in figure.

A mass of 50 kg is suspended from a spring of stiffness 10 kN/m. It is set into oscillations and it is observed that two successive oscillations have amplitudes 10 mm and 1 mm. Determine the damping ratio.

1.Why is sound a longitudinal wave?

Number of moles of electrons present in 34 g of NH3 is:

What is the velocity of electron ejected between two parallel plate of opposite charge when it hits the plate?what is angle of divergence?

Q. A swimmer going down stream in a river overtakes a floating body at some point A he continues for 2hrs and then return back and again meets a floating body at point B which is 18kms far from point A downstream. Then find the velocity of riverflow

A parallel capacitor is maintained at a certain potential difference. When a 3mm thick slab is introduced between the plates in order to maintain the same potential difference, the distance between the plates is increased by 2.4mm. Find dielectric constant of slab.

What is the real dimension and value of G.

A simple pendulum has some time period T. What will be the percentage change in its time period if its amplitude is decreased by 5 %?

63 On increasing the number of turns of coil in a moving coil galvanometer (1) current sensitivity increases (2) current sensitivity decreases (3) voltage sensitivity increases (4) voltage sensitivity decreases

A single conservative force F(x) acts on a 2.5 kg particle that moves along x−axis. The potential energy U(x) is given by U(x)=(10+(x−4)2) where x is in meter. At x=6 m, The particle has kinetic energy of 20 J. What is mechanical energy of the system?

184 The phase difference between current and voltage in an A.C circuit is 45radian. If the frequency of A.C Circuit is 50H.z then phase difference is equivalent to time difference of?

How milican calculate the charge of electrons by his oil drop experiment

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

By what percentage should the pressure of a given mass of gas be increased so as to decrease its volume by 10% at a constant temperature?

A plane is flying horizontally at 98 m/s and releasesan object which reaches the ground in 10 s. Theangle made by it while hitting the ground is :

A body of mass 20kg is thrown up with a velocity of 20m/s . Find the PE of the body at the highest point .

A current loop having two circular arcs joined by two radial line as shown in figure. It carries a current of 10 A. The magnetic field at point O will be close to

A sample of 0.1 g of water at 100∘C and normal pressure (1.03×105 Nm−2) requires 54 cal of heat energy to convert to steam at 100∘C. If the volume of the steam produced is 167.1 cc, the change in internal energy of the sample is

A and B are two equipotential surfaces . A charge of 2 μC is shot from origin with 102 m/s. Find work done by the field on the charge to cross the field. If field extends upto 20 cm in Y axis. [Given |V1 – V2| = 103 V ]

The potential energy of a particle of mass 1 kgalong x-axis is U= 5(1- cos3x)J. The time periodof small oscillation is2т(2)3 5(1) 2T/53/5(3)2TTC(4)2/5

A photographic flash unit consists of a xenon-filled tube. It gives a flash of average power 2000 W for 0.04 s. The flash is due to discharge of a fully charged capacitor of 40 μF. The voltage to which it is charged before a flash is given by the unit is

More than One Answer Typeएक से अधिक उत्तर प्रकार के प्रश्नValue of currents I and I1 shown in figure areचित्र में दर्शायी गयी धाराओं I तथा I1 के मान हैं

Two uniform thin rods each of length L and mass m are joined as shown in the figure.Find the dis†an ce of centre of mass of the system from point O

Find the derivative of px2+qx+rax+b where p,q,r,a,b are fixed non-zero constants.

A 2V battery is connected across the points A and B as shown in the figure given below. Assuming that the resistance of each diode is zero in forward bias and infinity in reverse bias, the current supplied by the battery when its positive terminal is connected to A is

A block of mass 5 kg is on a rough horizontal surface and is at rest. Now a force of 24 N is imparted to it with negligible impulse. If the coefficient of kinetic friction is 0.4 and g=9.8 m/s2, then the acceleration of the block is

An incompressible fluid is flowing in a cylindrical pipe of internal diameter 4 cm with a velocity of 5 m/s. If this tube is joined with another tube of internal diameter 2 cm, then the velocity of flow of fluid in the smaller tube will be

For infinite rod placed at some distance on at point axial position what is value of electric dield have charge density lambda

a car accelerates uniformly and its velocity changes from5m/s to 30 m/s in time't'find its average velocity. Need proper calculation

A bowler bowled a ball of mass 0.2 kg at a speed of 162 km/h. The batsman played a defensive shot and the ball came to rest after striking the bat. If the contact between the ball and the bat is for 0.015 s, find the magnitude of the impulsive force applied by the bat on the ball.

A mark is made on the bottom of a beaker and a microscope is focused on it . The microscope is raised through 1.5 cm . To what height water must be poured into the beaker to bring the mark again into focus ? Given that 'n' is 4/3

A line of force originates from a charge q1 at an angle α and terminates at a charge −q2 at an angle β. The value of beta in terms of α is: