50278 + Interview Questions in Physics

1.	The minimum energy necessary to overcome the attractive force between the electron and the surface of silver metal is 7.52 × 10−19 J. What will be the maximum kinetic energy of the electrons ejected from silver which is being irradiated with ultraviolet light having a wavelength 360 Å?
Answer» The minimum energy necessary to overcome the attractive force between the electron and the surface of silver metal is $7.52 \times 10^{- 19} J$ . What will be the maximum kinetic energy of the electrons ejected from silver which is being irradiated with ultraviolet light having a wavelength $360 Å$ ?

Discussion

2.	The graph represents the s-t curve of a body moving in a straight line. At which moment 't' is the instantaneous velocity approximately equal to the average velocity over the first 't' seconds?
Answer» The graph represents the s-t curve of a body moving in a straight line. At which moment 't' is the instantaneous velocity approximately equal to the average velocity over the first 't' seconds?

2.

The graph represents the s-t curve of a body moving in a straight line. At which moment 't' is the instantaneous velocity approximately equal to the average velocity over the first 't' seconds?

Answer»

The graph represents the s-t curve of a body moving in a straight line. At which moment 't' is the instantaneous velocity approximately equal to the average velocity over the first 't' seconds?

Discussion

3.	Unit vector parallel to the resultant of vectors →A=4^i−3^j and →B=8^i+8^j
Answer» Unit vector parallel to the resultant of vectors $\to A = 4^i - 3^j$ and $\to B = 8^i + 8^j$

Discussion

4.	What is SI unit of viscosity coefficient (η)? (a) Pascal (b) Nsm−2 (c) km−2s (d) Nm−2
Answer» What is SI unit of viscosity coefficient $(η)$ ? (a) Pascal (b) $N s m^{- 2}$ (c) $k m^{- 2} s$ (d) $N m^{- 2}$

4.

What is SI unit of viscosity coefficient (η)? (a) Pascal (b) Nsm−2 (c) km−2s (d) Nm−2

Answer»

What is SI unit of viscosity coefficient $(η)$ ?

(a) Pascal (b) $N s m^{- 2}$ (c) $k m^{- 2} s$ (d) $N m^{- 2}$

Discussion

5.	A steady current flows in a metallic conductor of non-uniform cross section. The quantity/quantities constant along the length of the conductor is/are [IIT-JEE 1997]
Answer» A steady current flows in a metallic conductor of non-uniform cross section. The quantity/quantities constant along the length of the conductor is/are [IIT-JEE 1997]

Discussion

6.	Which one has resistance - ammeter or Mili ammeter?why?
Answer» Which one has resistance - ammeter or Mili ammeter?why?

Discussion

7.	The velocity of the rotating body is given by →V=→ω×→r, where →ω is the angular velocity and →r is the radius vector. The angular velocity of a body is →ω=^i−2^j+2^k and the radius vector →r=4^j−3^k, then \|→V\| is
Answer» The velocity of the rotating body is given by $\to V = \to ω \times \to r,$ where $\to ω$ is the angular velocity and $\to r$ is the radius vector. The angular velocity of a body is $\to ω =^i - 2^j + 2^k$ and the radius vector $\to r = 4^j - 3^k,$ then $\| \to V \|$ is

Discussion

8.	For a gas RCv=0.67. This gas is made up of molecules which are
Answer» For a gas $\frac{R}{C_{v}} = 0.67$ . This gas is made up of molecules which are

Discussion

9.	Two concave mirrors each of radius of curvature 40 cm are placed such that their principal axes are parallel to each other and at a distance of 1 cm to each other. Both the mirrors are at a distance of 100 cm to each other. Consider first reflection at M1 and then at M2. If the y-coordinate of the final image thus formed is found to be −x5 cm. Then find the value of x. (Take the location of the object as the origin).
Answer» Two concave mirrors each of radius of curvature $40 c m$ are placed such that their principal axes are parallel to each other and at a distance of $1 c m$ to each other. Both the mirrors are at a distance of $100 c m$ to each other. Consider first reflection at $M_{1}$ and then at $M_{2}$ . If the y-coordinate of the final image thus formed is found to be $- \frac{x}{5} cm$ . Then find the value of $x$ . (Take the location of the object as the origin).

Discussion

10.	A block P of mass m is placed on a frictionless horizontal surface. Another block Q of same mass is kept on P and connected to the wall with the help of a spring of spring constant k as shown in the figure. μs is the coefficient of friction between P and Q. The blocks move together performing SHM of amplitude A. The maximum value of the friction force between P and Q is:
Answer» A block P of mass m is placed on a frictionless horizontal surface. Another block Q of same mass is kept on P and connected to the wall with the help of a spring of spring constant k as shown in the figure. $μ_{s}$ is the coefficient of friction between P and Q. The blocks move together performing SHM of amplitude A. The maximum value of the friction force between P and Q is:

Discussion

11.	(64)−12−(−32)−45=?
Answer» ${(64)}^{- \frac{1}{2}} - {(- 32)}^{- \frac{4}{5}} = ?$

Discussion

12.	Do electric flux pass only through insulators? Why?
Answer» Do electric flux pass only through insulators? Why?

Discussion

13.	A device 'X' is connected to an ac source V=V0sin ωt. The variation of voltage, current and power in one cycle is shown in the following graph: (a) Identify the device 'X'. (b) Which of the curves A, B and C represent the voltage, current and the power consumed in the circuit ? Justify your answer. (c) How does its impedance vary with frequency of the ac source ? Show graphically. (d) Obtain an expression for the current in the circuit and its phase relation with ac voltage.
Answer» A device 'X' is connected to an ac source $V = V_{0} s i n ω t$ . The variation of voltage, current and power in one cycle is shown in the following graph: (a) Identify the device 'X'. (b) Which of the curves A, B and C represent the voltage, current and the power consumed in the circuit ? Justify your answer. (c) How does its impedance vary with frequency of the ac source ? Show graphically. (d) Obtain an expression for the current in the circuit and its phase relation with ac voltage.

Discussion

14.	An observer is moving towards the stationary source of sound, then
Answer» An observer is moving towards the stationary source of sound, then

14.

An observer is moving towards the stationary source of sound, then

Answer»

An observer is moving towards the stationary source of sound, then

Discussion

15.	A particle revolves round a circular path. The acceleration of the particle is
Answer» A particle revolves round a circular path. The acceleration of the particle is

Discussion

16.	A bar magnet is moved in the direction indicated in the diagram between two coils PQ and CD. Predict the direction of induced current in each coil.
Answer» A bar magnet is moved in the direction indicated in the diagram between two coils PQ and CD. Predict the direction of induced current in each coil.

Discussion

17.	A stone is projected from a point on the ground in such a direction as to hit a bird on the top of a telegraph post of height h and then attain the maximum height 3h/2 above the ground. If at the instant of projection, the bird were to fly away horizontally with uniform speed, find the ratio between the horizontal velocities of the bird and the stone if the stone still hits the bird while descending. Take √3=1.73.
Answer» A stone is projected from a point on the ground in such a direction as to hit a bird on the top of a telegraph post of height $h$ and then attain the maximum height $3 h / 2$ above the ground. If at the instant of projection, the bird were to fly away horizontally with uniform speed, find the ratio between the horizontal velocities of the bird and the stone if the stone still hits the bird while descending. Take $\sqrt{3} = 1.73$ .

Discussion

18.	A vector in xy - plane has a magnitude of 25 m and magnitude of x - component is 20 m. The angle it makes with the positive x - axis is
Answer» A vector in xy - plane has a magnitude of $25 m$ and magnitude of x - component is $20 m$ . The angle it makes with the positive x - axis is

Discussion

19.	A block of ice at −12∘C is slowly heated and converted into steam at 100∘C. Which of the following curves best represents this event?
Answer» A block of ice at $- 12^{\circ} C$ is slowly heated and converted into steam at $100^{\circ} C$ . Which of the following curves best represents this event?

Discussion

20.	Two identical parallel plate capacitors A and B are connected to battery of V volts with the switch S closed. The switch is now opened and the free space between the plates of the capacitors is filled with a dielectric of dielectric constant K. Find the ratio of the total electrostatic energy stored in both capacitors before and after the introduction of the dielectric.
Answer» Two identical parallel plate capacitors A and B are connected to battery of V volts with the switch S closed. The switch is now opened and the free space between the plates of the capacitors is filled with a dielectric of dielectric constant K. Find the ratio of the total electrostatic energy stored in both capacitors before and after the introduction of the dielectric.

Discussion

21.	A glass bottle of volume 5 litres is filled with gasoline at room temperature. Accidently, the bottle was left close to an engine exhaust and the temperature rises by 40∘C. Calculate the volume of gasoline that spills out of the glass bottle as a result of this temperature rise. [Take room temperature to be 25∘C, coefficient of linear expansion of glass as 8.5×10−6/∘C, volumetric coefficient of gasoline at 25∘C as 950×10−6/∘C].
Answer» A glass bottle of volume $5 litres$ is filled with gasoline at room temperature. Accidently, the bottle was left close to an engine exhaust and the temperature rises by $40^{\circ} C$ . Calculate the volume of gasoline that spills out of the glass bottle as a result of this temperature rise. [Take room temperature to be $25^{\circ} C$ , coefficient of linear expansion of glass as $8.5 \times 10^{- 6} /^{\circ} C$ , volumetric coefficient of gasoline at $25^{\circ} C$ as $950 \times 10^{- 6} /^{\circ} C$ ].

Discussion

22.	Photons of energy 6 eV are incident on a metal surface whose work function is 4 eV. The minimum kinetic energy of the emitted photo-electrons will be
Answer» Photons of energy 6 eV are incident on a metal surface whose work function is 4 eV. The minimum kinetic energy of the emitted photo-electrons will be

Discussion

23.	An object is plaved at a distance of 40 cm from a concave mirror of focal length 10 cm. What is the image distance for the given situation?
Answer» An object is plaved at a distance of 40 cm from a concave mirror of focal length 10 cm. What is the image distance for the given situation?

Discussion

24.	One end of a steel rod (K=46Js−1m−1∘C−1) of length 1.0 m is kept in ice at 0∘ and the other end is kept in boiling water at 100∘. The area of cross section of the rod is 0.04 cm2. Assuming no heat loss to the atmosphere, find the mass of the ice melting per second. Latent heat of fusion of ice = 3.36×105JKg−1.
Answer» One end of a steel rod $(K = 46 J s^{- 1} m^{- 1 \circ} C^{- 1})$ of length 1.0 m is kept in ice at $0^{\circ}$ and the other end is kept in boiling water at $100^{\circ}$ . The area of cross section of the rod is $0.04 c m^{2}$ . Assuming no heat loss to the atmosphere, find the mass of the ice melting per second. Latent heat of fusion of ice = $3.36 \times 10^{5} J K g^{- 1}$ .

Discussion

25.	A body slides down a friction less track which ends in a circular loop of diameter D, then the minimum height h of the body in term of D so that it may just complete the loop, is
Answer» A body slides down a friction less track which ends in a circular loop of diameter D, then the minimum height h of the body in term of D so that it may just complete the loop, is

Discussion

26.	A particle is projected with a velocity of √7 ms−1 at an angle 60∘ with horizontal. Find the average velocity of the projectile between the instants of point of projection and reaching the highest point
Answer» A particle is projected with a velocity of $\sqrt{7} m s^{- 1}$ at an angle $60^{\circ}$ with horizontal. Find the average velocity of the projectile between the instants of point of projection and reaching the highest point

Discussion

27.	A car accelerates uniformly from 13 ms–1 to 31 ms–1 while entering the motorway, covering a distance of 220 m. Then the acceleration of the car will be:
Answer» A car accelerates uniformly from $13 {ms}^{- 1}$ to $31 {ms}^{- 1}$ while entering the motorway, covering a distance of $220 m$ . Then the acceleration of the car will be:

Discussion

28.	The radii of two planets are respectively R1 and R2 and their densities are respectively ρ1 and ρ2. The ratio of the accelerations due to gravity at their surface is
Answer» The radii of two planets are respectively $R_{1}$ and $R_{2}$ and their densities are respectively $ρ_{1} a n d ρ_{2}$ . The ratio of the accelerations due to gravity at their surface is

Discussion

29.	Three thin prisms are combined as shown in figure. The refractive indices of the crown glass for red, yellow and violet rays are μr, μy and μv respectively and those for the flint glass are, μ′r, μ′y and μ′v respectively. Find the ratio A′A for which (a) there is no net angular dispersion, and (b) there is no net deviation in the yellow ray.
Answer» Three thin prisms are combined as shown in figure. The refractive indices of the crown glass for red, yellow and violet rays are $μ_{r}, μ_{y}$ and $μ_{v}$ respectively and those for the flint glass are, $μ_{r}^{'}, μ_{y}^{'}$ and $μ_{v}^{'}$ respectively. Find the ratio $\frac{A^{'}}{A}$ for which (a) there is no net angular dispersion, and (b) there is no net deviation in the yellow ray.

29.

Three thin prisms are combined as shown in figure. The refractive indices of the crown glass for red, yellow and violet rays are μr, μy and μv respectively and those for the flint glass are, μ′r, μ′y and μ′v respectively. Find the ratio A′A for which (a) there is no net angular dispersion, and (b) there is no net deviation in the yellow ray.

Answer»

Three thin prisms are combined as shown in figure. The refractive indices of the crown glass for red, yellow and violet rays are $μ_{r}, μ_{y}$ and $μ_{v}$ respectively and those for the flint glass are, $μ_{r}^{'}, μ_{y}^{'}$ and $μ_{v}^{'}$ respectively. Find the ratio $\frac{A^{'}}{A}$ for which (a) there is no net angular dispersion, and (b) there is no net deviation in the yellow ray.

Discussion

30.	Which of the following property is applicable to whether it is considered as a wave or as a particle.
Answer» Which of the following property is applicable to whether it is considered as a wave or as a particle.

Discussion

31.	A rectangular metallic loop of length l and width b is placed coplanarly with a long wire carrying a current i (figure 38-E28). The loop is moved perpendicular to the wire with a speed u in the plane containing the wire and the loop. Calculate the emf induced in the loop when the rear end of the loop is at a distance a from the wire. Solve by using Faraday's law for the flux through the loop and also by replacing different segments with equivalent batteries.
Answer» A rectangular metallic loop of length l and width b is placed coplanarly with a long wire carrying a current i (figure 38-E28). The loop is moved perpendicular to the wire with a speed u in the plane containing the wire and the loop. Calculate the emf induced in the loop when the rear end of the loop is at a distance a from the wire. Solve by using Faraday's law for the flux through the loop and also by replacing different segments with equivalent batteries.

31.

A rectangular metallic loop of length l and width b is placed coplanarly with a long wire carrying a current i (figure 38-E28). The loop is moved perpendicular to the wire with a speed u in the plane containing the wire and the loop. Calculate the emf induced in the loop when the rear end of the loop is at a distance a from the wire. Solve by using Faraday's law for the flux through the loop and also by replacing different segments with equivalent batteries.

Answer»

A rectangular metallic loop of length l and width b is placed coplanarly with a long wire carrying a current i (figure 38-E28). The loop is moved perpendicular to the wire with a speed u in the plane containing the wire and the loop. Calculate the emf induced in the loop when the rear end of the loop is at a distance a from the wire. Solve by using Faraday's law for the flux through the loop and also by replacing different segments with equivalent batteries.

Discussion

32.	Two waves, y1=2acosωt and y2=3acos(ωt+π2) meet at a point. The amplitude of the resultant wave is
Answer» Two waves, $y_{1} = 2 a cos ω t$ and $y_{2} = 3 a cos (ω t + \frac{π}{2})$ meet at a point. The amplitude of the resultant wave is

Discussion

33.	How many 'd' electrons in Cu+ can have the spin quantum (−12)?
Answer» How many 'd' electrons in $C u^{+}$ can have the spin quantum $(\frac{- 1}{2})$ ?

Discussion

34.	An inductance of 1 mH and a charged capacitor capacitance of 10μF are connected across each other. The resonating angular frequency of circuit is
Answer» An inductance of 1 mH and a charged capacitor capacitance of 10 $μ$ F are connected across each other. The resonating angular frequency of circuit is

Discussion

35.	At what angular speed the Earth should rotate, so that effective acceleration due to gravity at 45∘ latitude becomes half of effective acceleration due to gravity at pole? (Radius of earth is R and acceleration due to gravity without taking variation of Earth’s rotation at surface is ‘g′)
Answer» At what angular speed the Earth should rotate, so that effective acceleration due to gravity at $45^{\circ}$ latitude becomes half of effective acceleration due to gravity at pole? (Radius of earth is $R$ and acceleration due to gravity without taking variation of Earth’s rotation at surface is $‘ g^{'}$ )

Discussion

36.	Two equal negative charge – q are fixed at the fixed points (0, a) and (0, -a) on the Y-axis. A positive charge Q is released from rest at the point (2a, 0) on the X-axis. The charge Q will
Answer» Two equal negative charge – q are fixed at the fixed points (0, a) and (0, -a) on the Y-axis. A positive charge Q is released from rest at the point (2a, 0) on the X-axis. The charge Q will

Discussion

37.	A body of mass m makes an elastic collision with another identical body at rest.Show that if the collision is not head-on,the bodies go at right angle to each other after the collision.
Answer» A body of mass m makes an elastic collision with another identical body at rest.Show that if the collision is not head-on,the bodies go at right angle to each other after the collision.

Discussion

38.	The angle between the vectors →A and →B is θ. Find the value of the triple product →A.(→B × →A).
Answer» The angle between the vectors $\to A$ and $\to B$ is $θ$ . Find the value of the triple product $\to A . (\to B \times \to A)$ .

Discussion

39.	Find →A×→B, if →A=^i+4^k and →B=−^j
Answer» Find $\to A \times \to B,$ if $\to A =^i + 4^k$ and $\to B = -^j$

Discussion

40.	Ram learned in high school that electric current is the flow of electrons. Ram’s teacher had also told him that at any temperature the electrons of any metal move very randomly with very high speeds (around 100km/second). So Ram imagines that when a current flows through a conductor, this random motion must cease and all electrons move in one particular direction like a marching army (flow in a sense)
Answer» Ram learned in high school that electric current is the flow of electrons. Ram’s teacher had also told him that at any temperature the electrons of any metal move very randomly with very high speeds (around 100km/second). So Ram imagines that when a current flows through a conductor, this random motion must cease and all electrons move in one particular direction like a marching army (flow in a sense)

Discussion

41.	An open square tank of side 1 m is completely filled with water. If the tank is moved with an acceleration of 10 ms2, find the slope of the free surface of water with the horizontal and the quantity of water which will spill out of the tank.
Answer» An open square tank of side $1 m$ is completely filled with water. If the tank is moved with an acceleration of $10 m s^{2}$ , find the slope of the free surface of water with the horizontal and the quantity of water which will spill out of the tank.

Discussion

42.	The author says, "We cling eagerly to our accustomed ways". Which one of the following statements may be considered as the assumption of the author?
Answer» The author says, "We cling eagerly to our accustomed ways". Which one of the following statements may be considered as the assumption of the author?

Discussion

43.	When a PN junction diode is reverse biased
Answer» When a PN junction diode is reverse biased

Discussion

44.	A capacitor is charged by using a battery which is then disconnected. A dielectric slab is then slipped between the plates, which results in:
Answer» A capacitor is charged by using a battery which is then disconnected. A dielectric slab is then slipped between the plates, which results in:

Discussion

45.	Why is exposure to X- ray injurious to health but exposure to visible light is not, when both are electromagnetic waves?
Answer» Why is exposure to X- ray injurious to health but exposure to visible light is not, when both are electromagnetic waves?

Discussion

46.	What are the derived quantity of electric current and amount of substance?
Answer» What are the derived quantity of electric current and amount of substance?

Discussion

47.	The linear charge density on a ring which varies with angle θ can be represented as λ=Kcosθ2,wherek = 2 cm^{-1}and\theta$ is the angle subtended by the radius of the ring with the horizontal. The potential at the centre of the ring is
Answer» The linear charge density on a ring which varies with angle $θ$ can be represented as $λ = K c o s \frac{θ}{2}, w h e r e$ k = 2 cm^{-1} $a n d$ \theta$ is the angle subtended by the radius of the ring with the horizontal. The potential at the centre of the ring is

Discussion

48.	Derivative of a constant is equal to zero because the rate of change of a constant with respect to some other variable is zero.
Answer» Derivative of a constant is equal to zero because the rate of change of a constant with respect to some other variable is zero.

Discussion

49.	A ball is thrown vertically downwards from a height of 20 m with an initial velocity υ0. It collides with the ground, loses 50 percent of its energy in collision and rebounds to the same height. The initial velocity υ0 is (Take g=10ms−2)
Answer» A ball is thrown vertically downwards from a height of $20 m$ with an initial velocity $υ_{0}$ . It collides with the ground, loses $50$ percent of its energy in collision and rebounds to the same height. The initial velocity $υ_{0}$ is (Take $g = 10 m s^{- 2}$ )

Discussion

50.	A mass attached to a spring executes SHM Match the following conditions. (i) vx>0, ax>0 (I)x>0 (ii) vx<0, ax>0 (iii) vx>0, ax<0 (II)x<0 (iv) vx<0, ax<0
Answer» A mass attached to a spring executes SHM Match the following conditions. (i) $v_{x} > 0, a_{x} > 0 (I) x > 0$ (ii) $v_{x} < 0, a_{x} > 0$ (iii) $v_{x} > 0, a_{x} < 0 (I I) x < 0$ (iv) $v_{x} < 0, a_{x} < 0$

50.

A mass attached to a spring executes SHM Match the following conditions. (i) vx>0, ax>0 (I)x>0 (ii) vx<0, ax>0 (iii) vx>0, ax<0 (II)x<0 (iv) vx<0, ax<0

Answer»

A mass attached to a spring executes SHM

Match the following conditions.

(i) $v_{x} > 0, a_{x} > 0 (I) x > 0$

(ii) $v_{x} < 0, a_{x} > 0$

(iii) $v_{x} > 0, a_{x} < 0 (I I) x < 0$

(iv) $v_{x} < 0, a_{x} < 0$

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The minimum energy necessary to overcome the attractive force between the electron and the surface of silver metal is 7.52 × 10−19 J. What will be the maximum kinetic energy of the electrons ejected from silver which is being irradiated with ultraviolet light having a wavelength 360 Å?

The graph represents the s-t curve of a body moving in a straight line. At which moment 't' is the instantaneous velocity approximately equal to the average velocity over the first 't' seconds?

Unit vector parallel to the resultant of vectors →A=4^i−3^j and →B=8^i+8^j

What is SI unit of viscosity coefficient (η)? (a) Pascal (b) Nsm−2 (c) km−2s (d) Nm−2

A steady current flows in a metallic conductor of non-uniform cross section. The quantity/quantities constant along the length of the conductor is/are [IIT-JEE 1997]

Which one has resistance - ammeter or Mili ammeter?why?

The velocity of the rotating body is given by →V=→ω×→r, where →ω is the angular velocity and →r is the radius vector. The angular velocity of a body is →ω=^i−2^j+2^k and the radius vector →r=4^j−3^k, then |→V| is

For a gas RCv=0.67. This gas is made up of molecules which are

(64)−12−(−32)−45=?

Do electric flux pass only through insulators? Why?

An observer is moving towards the stationary source of sound, then

A particle revolves round a circular path. The acceleration of the particle is

A bar magnet is moved in the direction indicated in the diagram between two coils PQ and CD. Predict the direction of induced current in each coil.

A vector in xy - plane has a magnitude of 25 m and magnitude of x - component is 20 m. The angle it makes with the positive x - axis is

A block of ice at −12∘C is slowly heated and converted into steam at 100∘C. Which of the following curves best represents this event?

Photons of energy 6 eV are incident on a metal surface whose work function is 4 eV. The minimum kinetic energy of the emitted photo-electrons will be

An object is plaved at a distance of 40 cm from a concave mirror of focal length 10 cm. What is the image distance for the given situation?

A body slides down a friction less track which ends in a circular loop of diameter D, then the minimum height h of the body in term of D so that it may just complete the loop, is

A particle is projected with a velocity of √7 ms−1 at an angle 60∘ with horizontal. Find the average velocity of the projectile between the instants of point of projection and reaching the highest point

A car accelerates uniformly from 13 ms–1 to 31 ms–1 while entering the motorway, covering a distance of 220 m. Then the acceleration of the car will be:

The radii of two planets are respectively R1 and R2 and their densities are respectively ρ1 and ρ2. The ratio of the accelerations due to gravity at their surface is

Which of the following property is applicable to whether it is considered as a wave or as a particle.

Two waves, y1=2acosωt and y2=3acos(ωt+π2) meet at a point. The amplitude of the resultant wave is

How many 'd' electrons in Cu+ can have the spin quantum (−12)?

An inductance of 1 mH and a charged capacitor capacitance of 10μF are connected across each other. The resonating angular frequency of circuit is

At what angular speed the Earth should rotate, so that effective acceleration due to gravity at 45∘ latitude becomes half of effective acceleration due to gravity at pole? (Radius of earth is R and acceleration due to gravity without taking variation of Earth’s rotation at surface is ‘g′)

Two equal negative charge – q are fixed at the fixed points (0, a) and (0, -a) on the Y-axis. A positive charge Q is released from rest at the point (2a, 0) on the X-axis. The charge Q will

A body of mass m makes an elastic collision with another identical body at rest.Show that if the collision is not head-on,the bodies go at right angle to each other after the collision.

The angle between the vectors →A and →B is θ. Find the value of the triple product →A.(→B × →A).

Find →A×→B, if →A=^i+4^k and →B=−^j

An open square tank of side 1 m is completely filled with water. If the tank is moved with an acceleration of 10 ms2, find the slope of the free surface of water with the horizontal and the quantity of water which will spill out of the tank.

The author says, "We cling eagerly to our accustomed ways". Which one of the following statements may be considered as the assumption of the author?

When a PN junction diode is reverse biased

A capacitor is charged by using a battery which is then disconnected. A dielectric slab is then slipped between the plates, which results in:

Why is exposure to X- ray injurious to health but exposure to visible light is not, when both are electromagnetic waves?

What are the derived quantity of electric current and amount of substance?

The linear charge density on a ring which varies with angle θ can be represented as λ=Kcosθ2,wherek = 2 cm^{-1}and\theta$ is the angle subtended by the radius of the ring with the horizontal. The potential at the centre of the ring is

Derivative of a constant is equal to zero because the rate of change of a constant with respect to some other variable is zero.

A ball is thrown vertically downwards from a height of 20 m with an initial velocity υ0. It collides with the ground, loses 50 percent of its energy in collision and rebounds to the same height. The initial velocity υ0 is (Take g=10ms−2)

A mass attached to a spring executes SHM Match the following conditions. (i) vx&gt;0, ax&gt;0 (I)x&gt;0 (ii) vx&lt;0, ax&gt;0 (iii) vx&gt;0, ax&lt;0 (II)x&lt;0 (iv) vx&lt;0, ax&lt;0

A mass attached to a spring executes SHM Match the following conditions. (i) vx>0, ax>0 (I)x>0 (ii) vx<0, ax>0 (iii) vx>0, ax<0 (II)x<0 (iv) vx<0, ax<0