50278 + Interview Questions in Physics

1.	The pressure exerted by 12g of an ideal gas at t∘C in a vessel of V L volume is 1 atm. When the temperature is increased by 10∘C in the same vessel the pressure increases by 10%. The value of t is –
Answer» The pressure exerted by 12g of an ideal gas at $t^{\circ} C$ in a vessel of V L volume is 1 atm. When the temperature is increased by $10^{\circ} C$ in the same vessel the pressure increases by $10 %$ . The value of t is –

Discussion

2.	Two masses M1 and M2 are attached to the ends of a string which passes over a pulley attached to the top of an inclined plane. The angle of inclination of the plane in θ.Take g=10 ms−2.
Answer» Two masses M1 and M2 are attached to the ends of a string which passes over a pulley attached to the top of an inclined plane. The angle of inclination of the plane in $θ . T a k e g = 10 m s^{- 2}$ .

2.

Two masses M1 and M2 are attached to the ends of a string which passes over a pulley attached to the top of an inclined plane. The angle of inclination of the plane in θ.Take g=10 ms−2.

Answer»

Two masses M1 and M2 are attached to the ends of a string which passes over a pulley attached to the top of an inclined plane. The angle of inclination of the plane in $θ . T a k e g = 10 m s^{- 2}$ .

Discussion

3.	A transparent solid cylindrical rod has a refractive index of 2√3. It is surrounded by air. A light ray is incident at the midpoint of one end of the rod as shown in the figure. The incident angle θ for which the light ray grazes along the wall of the rod is
Answer» A transparent solid cylindrical rod has a refractive index of $\frac{2}{\sqrt{3}}$ . It is surrounded by air. A light ray is incident at the midpoint of one end of the rod as shown in the figure. The incident angle $θ$ for which the light ray grazes along the wall of the rod is

Discussion

4.	The electric field at a point associated with a light wave is E = (100 Vm −1) sin [(3.0 ×1015s−1)t] sin [(6.0×1015s−1)t]. If this light falls on a metal surface having a work function of 2.0 eV, what will be the maximum kinetic energy of the photo electrons ?
Answer» The electric field at a point associated with a light wave is E = (100 Vm $^{- 1}$ ) sin [(3.0 $\times 10^{15} s^{- 1}$ )t] sin [ $(6.0 \times 10^{15} s^{- 1}) t$ ]. If this light falls on a metal surface having a work function of 2.0 eV, what will be the maximum kinetic energy of the photo electrons ?

Discussion

5.	A uniform rod of mass 15 kg and length 3 m hinged at point O, is held stationary initially with the help of a light string (connected at point A) as shown in figure. At t=0, if the string breaks, find the hinge force acting on the rod at that instant. (Take g=10 m/s2)
Answer» A uniform rod of mass $15 kg$ and length $3 m$ hinged at point $O$ , is held stationary initially with the help of a light string (connected at point $A$ ) as shown in figure. At $t = 0$ , if the string breaks, find the hinge force acting on the rod at that instant. (Take $g = 10 {m/s}^{2})$

Discussion

6.	The pendulum of a certain clock has time period 2.04 s. How fast or slow does the clock run during 24 hours ?
Answer» The pendulum of a certain clock has time period 2.04 s. How fast or slow does the clock run during 24 hours ?

Discussion

7.	Is chane in enthalpy zero for an isothermal process?
Answer» Is chane in enthalpy zero for an isothermal process?

Discussion

8.	The half-life of cobalt-60 is 5.25 yrs. After how long does its activity reduce to about one eight of its original value?
Answer» The half-life of cobalt-60 is 5.25 yrs. After how long does its activity reduce to about one eight of its original value?

Discussion

9.	Find the area of the parallelogram,whose diagonals are →d1=5^i and →d2=2^j.
Answer» Find the area of the parallelogram,whose diagonals are $_{1} = 5^i$ and $_{2} = 2^j$ .

Discussion

10.	LIght of wavelength 560 nm goes through a pinhole of diameter 0.20 mm and falls on a wall at a distance of 2.00 m. What will be th eradius of the central bright spot formed on the wall?
Answer» LIght of wavelength 560 nm goes through a pinhole of diameter 0.20 mm and falls on a wall at a distance of 2.00 m. What will be th eradius of the central bright spot formed on the wall?

Discussion

11.	A thin rod of length 4l, mass 4m is bent at the points shown in the figure. What is the moment of inertia of the rod about the axis passing point O and perpendicular to the plane of the paper?
Answer» A thin rod of length $4 l$ , mass $4 m$ is bent at the points shown in the figure. What is the moment of inertia of the rod about the axis passing point $O$ and perpendicular to the plane of the paper?

Discussion

12.	What is dimensional analysis? give example also.
Answer» What is dimensional analysis? give example also.

Discussion

13.	A man observed the pressure amplitude in a sound wave from a wireless receiver as 4×10−2 N/m2 and the intensity at a point as 10−6 W/m2. If by turning the volume knob, the pressure amplitude is increased to 5×10−2 N/m2, evaluate the intensity.
Answer» A man observed the pressure amplitude in a sound wave from a wireless receiver as $4 \times 10^{- 2} {N/m}^{2}$ and the intensity at a point as $10^{- 6} {W/m}^{2}$ . If by turning the volume knob, the pressure amplitude is increased to $5 \times 10^{- 2} {N/m}^{2}$ , evaluate the intensity.

Discussion

14.	The dielectric strength of air is 3.0×1026 V/m. A parallel-plate air-capacitor has area 20 cm2 and plate separation 0.10 mm. Find the maximum rms voltage of an AC source which can be safely connected to this capacitor.
Answer» The dielectric strength of air is $3.0 \times 102^{6}$ V/m. A parallel-plate air-capacitor has area 20 $c m^{2}$ and plate separation 0.10 mm. Find the maximum rms voltage of an AC source which can be safely connected to this capacitor.

Discussion

15.	Gravel is dropped into a conveyor belt at the rate of 0.5 Kg/s. Find the extra force required to keep the belt moving at 2 m/s.
Answer» Gravel is dropped into a conveyor belt at the rate of $0.5 Kg/s$ . Find the extra force required to keep the belt moving at $2 m/s$ .

Discussion

16.	In a certain circuit current changes with time according to i=2√t.The r.m.s value of current between t = 2 to t = 4s will be
Answer» In a certain circuit current changes with time according to $i = 2 \sqrt{t}$ .The r.m.s value of current between t = 2 to t = 4s will be

Discussion

17.	The temperature and the dew point in an open room are 200C and 100C. If the room temperature drops to 150C, what will be the new dew point ?
Answer» The temperature and the dew point in an open room are $20^{0}$ C and $10^{0}$ C. If the room temperature drops to $15^{0}$ C, what will be the new dew point ?

Discussion

18.	Two coherent narrow slits emitting sound of wavelength λ in the same phase are placed parallel to each other at a small separation of 2λ. The sound is detected by moving a detector on the screen E at a distance D(>>λ) from the slit S, as shown in figure (16-E6). Find the distance x such that the intensity at P is equal to the intensity at O.
Answer» Two coherent narrow slits emitting sound of wavelength $λ$ in the same phase are placed parallel to each other at a small separation of $2 λ$ . The sound is detected by moving a detector on the screen E at a distance $D (>> λ)$ from the slit S, as shown in figure (16-E6). Find the distance x such that the intensity at P is equal to the intensity at O.

18.

Two coherent narrow slits emitting sound of wavelength λ in the same phase are placed parallel to each other at a small separation of 2λ. The sound is detected by moving a detector on the screen E at a distance D(>>λ) from the slit S, as shown in figure (16-E6). Find the distance x such that the intensity at P is equal to the intensity at O.

Answer»

Two coherent narrow slits emitting sound of wavelength $λ$ in the same phase are placed parallel to each other at a small separation of $2 λ$ . The sound is detected by moving a detector on the screen E at a distance $D (>> λ)$ from the slit S, as shown in figure (16-E6). Find the distance x such that the intensity at P is equal to the intensity at O.

Discussion

19.	The bob of simple pendulum having density 40003 kg/m3 executes SHM in water with a period ′t′ s. If the period of oscillation of bob in air is 10 s, find the value of ′t′. (Neglect frictional force of water, take density of water as 1000 kg/m3)
Answer» The bob of simple pendulum having density $\frac{4000}{3} {kg/m}^{3}$ executes $SHM$ in water with a period $^{'} t^{'} s$ . If the period of oscillation of bob in air is $10 s$ , find the value of $^{'} t^{'}$ . (Neglect frictional force of water, take density of water as $1000 {kg/m}^{3}$ )

Discussion

20.	n balls each of mass m impinge elastically each second on a surface with velocity u. The average force experienced by the surface will be
Answer» n balls each of mass m impinge elastically each second on a surface with velocity u. The average force experienced by the surface will be

Discussion

21.	A cube made of insulating material has uniform charge distribution throughout its volume. Taking the electric potential due to this charged cube at infinity to be zero, the potential at the center is found to be Vo. The potential at one of its corners is
Answer» A cube made of insulating material has uniform charge distribution throughout its volume. Taking the electric potential due to this charged cube at infinity to be zero, the potential at the center is found to be $V_{o} .$ The potential at one of its corners is

Discussion

22.	A wire loop enclosing a semicircle of radius R is located on the boundary of uniform magnetic field B. At time t=0, the loop is set into motion with constant angular accleration α about an axis passing through O and is perpendicular to semicircle. The clockwise emf direction is taken to be positive. The modulus of variation of emf as a function of time is (0<θ<π), then the variation of emf as a function of time is given by the graph
Answer» A wire loop enclosing a semicircle of radius $R$ is located on the boundary of uniform magnetic field $B$ . At time $t = 0$ , the loop is set into motion with constant angular accleration $α$ about an axis passing through $O$ and is perpendicular to semicircle. The clockwise emf direction is taken to be positive. The modulus of variation of emf as a function of time is ( $0 < θ < π$ ), then the variation of emf as a function of time is given by the graph

Discussion

23.	An inductor coil stores U energy when i current is passed through it and dissipates energy at the rate of P. The time constant of the circuit, when this coil is connected across a battery of zero internal resistance is
Answer» An inductor coil stores U energy when i current is passed through it and dissipates energy at the rate of P. The time constant of the circuit, when this coil is connected across a battery of zero internal resistance is

Discussion

24.	In the figure shown the current flowing through the resistor of resistance 2 R is
Answer» In the figure shown the current flowing through the resistor of resistance 2 R is

24.

In the figure shown the current flowing through the resistor of resistance 2 R is

Answer»

In the figure shown the current flowing through the resistor of resistance 2 R is

Discussion

25.	A particle is moving on a circular path of radius 20 m. The speed of particle at any instant is given by the relation v=3t2−5t m/s. What is the magnitude of total acceleration of this particle at t=5 s ?
Answer» A particle is moving on a circular path of radius $20 m$ . The speed of particle at any instant is given by the relation $v = 3 t^{2} - 5 t$ $m/s$ . What is the magnitude of total acceleration of this particle at $t = 5 s$ ?

Discussion

26.	Both the strings, shown in figure, are made of same material and have same cross-section. The pulleys are light. The wave speed of a transverse wave in the string AB is v1 and in CD it is v2. Then v1v2 is
Answer» Both the strings, shown in figure, are made of same material and have same cross-section. The pulleys are light. The wave speed of a transverse wave in the string $A B$ is $v_{1}$ and in $C D$ it is $v_{2}$ . Then $\frac{v_{1}}{v_{2}}$ is

26.

Both the strings, shown in figure, are made of same material and have same cross-section. The pulleys are light. The wave speed of a transverse wave in the string AB is v1 and in CD it is v2. Then v1v2 is

Answer»

Both the strings, shown in figure, are made of same material and have same cross-section. The pulleys are light. The wave speed of a transverse wave in the string $A B$ is $v_{1}$ and in $C D$ it is $v_{2}$ . Then $\frac{v_{1}}{v_{2}}$ is

Discussion

27.	The kinetic energy of a body of mass 4 kg and having momentum of 6 kg-m/s will be
Answer» The kinetic energy of a body of mass 4 kg and having momentum of 6 kg-m/s will be

Discussion

28.	If x=(6y+4)(3y2+4y+3), then ∫xdy will be
Answer» If $x = (6 y + 4) (3 y^{2} + 4 y + 3)$ , then $\int x d y$ will be

Discussion

29.	The reduced mass of two particles having masses 4m and 2m is
Answer» The reduced mass of two particles having masses $4 m$ and $2 m$ is

Discussion

30.	A solid cylinder of mass m is kept on the edge of a plank of mass 3m and length 15 m which in turn is kept on smooth ground. The coefficient of friction between the plank and the cylinder is 0.1. The cylinder is given an impulse which imparts it a velocity of 6 m/s but no angular velocity. Find the time (jn seconds) after which the cylinder will start pure rolling.
Answer» A solid cylinder of mass $m$ is kept on the edge of a plank of mass $3 m$ and length $15 m$ which in turn is kept on smooth ground. The coefficient of friction between the plank and the cylinder is $0.1$ . The cylinder is given an impulse which imparts it a velocity of $6 m/s$ but no angular velocity. Find the time (jn seconds) after which the cylinder will start pure rolling.

Discussion

31.	The ratio of radii of nuclei 13Al27 and 52XP is 3:5. The number of neutrons in the nuclei of X will be
Answer» The ratio of radii of nuclei $_{13} {Al}^{27}$ and $_{52} X^{P}$ is $3 : 5$ . The number of neutrons in the nuclei of X will be

Discussion

32.	A pulse travelling on a string is represented by the function y=a3(x−vt)2+a2, where a = 5 mm and v=20 cm s−1. Sketch the shape of the string at t = 0, 1s and 2s. Take x = 0 in the middle of the string.
Answer» A pulse travelling on a string is represented by the function $y = \frac{a^{3}}{(x - v t)^{2} + a^{2}},$ where a = 5 mm and $v = 20 c m s^{- 1}$ . Sketch the shape of the string at t = 0, 1s and 2s. Take x = 0 in the middle of the string.

32.

A pulse travelling on a string is represented by the function y=a3(x−vt)2+a2, where a = 5 mm and v=20 cm s−1. Sketch the shape of the string at t = 0, 1s and 2s. Take x = 0 in the middle of the string.

Answer»

A pulse travelling on a string is represented by the function

$y = \frac{a^{3}}{(x - v t)^{2} + a^{2}},$

where a = 5 mm and $v = 20 c m s^{- 1}$ . Sketch the shape of the string at t = 0, 1s and 2s. Take x = 0 in the middle of the string.

Discussion

33.	In the diagram shown below, all three rods are of equal length L=1 m and equal mass M=3 kg. The system is rotated such that rod B is the axis. What is the moment of inertia of the system?
Answer» In the diagram shown below, all three rods are of equal length $L = 1 m$ and equal mass $M = 3 kg$ . The system is rotated such that rod $B$ is the axis. What is the moment of inertia of the system?

Discussion

34.	Ram goes from point A to B by auto at the speed of 20 km/hr and comes back from B to A in a cab at a speed of 80 km/hr. Find his average speed
Answer» Ram goes from point A to B by auto at the speed of 20 km/hr and comes back from B to A in a cab at a speed of 80 km/hr. Find his average speed

Discussion

35.	Find the greatest length of an organ pipe open at both ends that will have its fundamental frequency in the normal hearing range (20-20,000 Hz). Speed of sound in air = 340ms−1.
Answer» Find the greatest length of an organ pipe open at both ends that will have its fundamental frequency in the normal hearing range (20-20,000 Hz). Speed of sound in air = $340 m s^{- 1}$ .

Discussion

36.	In order to find time, the astronaut orbiting in an earth satellite should use
Answer» In order to find time, the astronaut orbiting in an earth satellite should use

Discussion

37.	A block of mass 0.18 kg is attached to a spring of force-constant 2 N/m. The coefficient of friction between the block and the floor is 0.1. Initially the block is at rest and the spring is un-stretched. An impulse is given to the block as shown in the figure. The block slides a distance of 0.06 m and comes to rest for the first time. The initial velocity of the block in m/s is V = N/10. Then N is
Answer» A block of mass 0.18 kg is attached to a spring of force-constant 2 N/m. The coefficient of friction between the block and the floor is 0.1. Initially the block is at rest and the spring is un-stretched. An impulse is given to the block as shown in the figure. The block slides a distance of 0.06 m and comes to rest for the first time. The initial velocity of the block in m/s is V = N/10. Then N is

Discussion

38.	A boy of mass 45 kg, whose leg bones have a cross-sectional area of 5 cm2 and length 50 cm, falls through a height of 2 m without breaking his leg bones. If the bones can withstand a stress of 0.9×108 Nm−2, calculate the Young's modulus for the material of the bone. Use, g=10 ms−2
Answer» A boy of mass $45 kg$ , whose leg bones have a cross-sectional area of $5 {cm}^{2}$ and length $50 cm$ , falls through a height of $2 m$ without breaking his leg bones. If the bones can withstand a stress of $0.9 \times 10^{8} {Nm}^{- 2}$ , calculate the Young's modulus for the material of the bone. Use, $g = 10 {ms}^{- 2}$

Discussion

39.	A magnet with a mass of 0.25 kg moving with a velocity of 10 m/s strikes a metal block of mass 20 kg moving with a velocity of 5 m/s. Both magnet and block are moving in the same direction initially. The magnet sticks to the metal block after the collision. What is the final velocity of the system ?
Answer» A magnet with a mass of $0.25 kg$ moving with a velocity of $10 m/s$ strikes a metal block of mass $20 kg$ moving with a velocity of $5 m/s$ . Both magnet and block are moving in the same direction initially. The magnet sticks to the metal block after the collision. What is the final velocity of the system ?

Discussion

40.	A standing wave y=A sin (20πx3)cos (1000 π t) is set up in a taut string, where x and y are in metre and t is in seconds. The distance between first two successive points oscillating with the amplitude A2, from the fixed end will be equal to
Answer» A standing wave $y = A sin (\frac{20 π x}{3}) cos (1000 π t)$ is set up in a taut string, where $x$ and $y$ are in metre and $t$ is in seconds. The distance between first two successive points oscillating with the amplitude $\frac{A}{2}$ , from the fixed end will be equal to

Discussion

41.	A steel rod of length 5 m and diameter 30 mm is fixed between two rigid supports. Determine the thermal stress and change in diameter of the rod, when the temperature increases by 50 ∘C. Take Young's modulus of elasticity (Y)=2.0×106 kg/cm2, coefficient of thermal expansion (α)=12×10−6 /∘C and Poisson's ratio (ν)=0.3.
Answer» A steel rod of length $5 m$ and diameter $30 mm$ is fixed between two rigid supports. Determine the thermal stress and change in diameter of the rod, when the temperature increases by $50^{\circ} C$ . Take Young's modulus of elasticity $(Y) = 2.0 \times 10^{6} {kg/cm}^{2}$ , coefficient of thermal expansion $(α) = 12 \times 10^{- 6} /^{\circ} C$ and Poisson's ratio $(ν) = 0.3$ .

Discussion

42.	A particle of mass m is subjected to a force →F=F0[cos(t)^i+sin(t)^j]. If initially (t = 0) the particle was at rest, the kinetic energy of the particle at time t is given by
Answer» A particle of mass m is subjected to a force $\to F = F_{0} [c o s (t)^i + s i n (t)^j]$ . If initially (t = 0) the particle was at rest, the kinetic energy of the particle at time t is given by

Discussion

43.	Across a metallic conductor of non-uniform cross section a constant potential difference is applied. The quantity which remains constant along the conductor is :
Answer» Across a metallic conductor of non-uniform cross section a constant potential difference is applied. The quantity which remains constant along the conductor is :

Discussion

44.	Two masses each with mass 0.10 kg are moving with velocity 3 m/s along x axis and 5 m/s along y axis respectively. After an elastic collision, one of the masses moves with a velocity 4^i+4^j. The energy of the other mass after collision is x10 J. Then x is
Answer» Two masses each with mass $0.10 kg$ are moving with velocity $3 m/s$ along $x$ axis and $5 m/s$ along $y$ axis respectively. After an elastic collision, one of the masses moves with a velocity $4^i + 4^j$ . The energy of the other mass after collision is $\frac{x}{10} J$ . Then $x$ is

Discussion

45.	How to solve complex resistor circuit questions...I mean the proper approach to solve such questions.
Answer» How to solve complex resistor circuit questions...I mean the proper approach to solve such questions.

Discussion

46.	The concentric spherical metallic shells, A,B and C of radii a,b and c (a<b<c) have charge densities σ,−σ and σ respectively. If the shells A and C are at the same potential, then the relation between a,b and c is:
Answer» The concentric spherical metallic shells, $A, B$ and $C$ of radii $a, b$ and $c$ $(a < b < c)$ have charge densities $σ, - σ$ and $σ$ respectively. If the shells $A$ and $C$ are at the same potential, then the relation between $a, b$ and $c$ is:

Discussion

47.	The spring block system as shown in figure is in equilibrium. The string connecting blocks A and B is cut. The mass of all the three blocks is m and spring constant of both the spring is k. The amplitude of resulting oscillation of block A is
Answer» The spring block system as shown in figure is in equilibrium. The string connecting blocks $A$ and $B$ is cut. The mass of all the three blocks is $m$ and spring constant of both the spring is $k$ . The amplitude of resulting oscillation of block $A$ is

Discussion

48.	Which of the following is the correct unit for heat capacity?
Answer» Which of the following is the correct unit for heat capacity?

Discussion

49.	What is the relation between spring constant and spring's length?
Answer» What is the relation between spring constant and spring's length?

Discussion

50.	Define magnetic dipole moment of a current loop
Answer» Define magnetic dipole moment of a current loop

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The pressure exerted by 12g of an ideal gas at t∘C in a vessel of V L volume is 1 atm. When the temperature is increased by 10∘C in the same vessel the pressure increases by 10%. The value of t is –

Two masses M1 and M2 are attached to the ends of a string which passes over a pulley attached to the top of an inclined plane. The angle of inclination of the plane in θ.Take g=10 ms−2.

A transparent solid cylindrical rod has a refractive index of 2√3. It is surrounded by air. A light ray is incident at the midpoint of one end of the rod as shown in the figure. The incident angle θ for which the light ray grazes along the wall of the rod is

The electric field at a point associated with a light wave is E = (100 Vm −1) sin [(3.0 ×1015s−1)t] sin [(6.0×1015s−1)t]. If this light falls on a metal surface having a work function of 2.0 eV, what will be the maximum kinetic energy of the photo electrons ?

A uniform rod of mass 15 kg and length 3 m hinged at point O, is held stationary initially with the help of a light string (connected at point A) as shown in figure. At t=0, if the string breaks, find the hinge force acting on the rod at that instant. (Take g=10 m/s2)

The pendulum of a certain clock has time period 2.04 s. How fast or slow does the clock run during 24 hours ?

Is chane in enthalpy zero for an isothermal process?

The half-life of cobalt-60 is 5.25 yrs. After how long does its activity reduce to about one eight of its original value?

Find the area of the parallelogram,whose diagonals are →d1=5^i and →d2=2^j.

LIght of wavelength 560 nm goes through a pinhole of diameter 0.20 mm and falls on a wall at a distance of 2.00 m. What will be th eradius of the central bright spot formed on the wall?

A thin rod of length 4l, mass 4m is bent at the points shown in the figure. What is the moment of inertia of the rod about the axis passing point O and perpendicular to the plane of the paper?

What is dimensional analysis? give example also.

A man observed the pressure amplitude in a sound wave from a wireless receiver as 4×10−2 N/m2 and the intensity at a point as 10−6 W/m2. If by turning the volume knob, the pressure amplitude is increased to 5×10−2 N/m2, evaluate the intensity.

The dielectric strength of air is 3.0×1026 V/m. A parallel-plate air-capacitor has area 20 cm2 and plate separation 0.10 mm. Find the maximum rms voltage of an AC source which can be safely connected to this capacitor.

Gravel is dropped into a conveyor belt at the rate of 0.5 Kg/s. Find the extra force required to keep the belt moving at 2 m/s.

In a certain circuit current changes with time according to i=2√t.The r.m.s value of current between t = 2 to t = 4s will be

The temperature and the dew point in an open room are 200C and 100C. If the room temperature drops to 150C, what will be the new dew point ?

The bob of simple pendulum having density 40003 kg/m3 executes SHM in water with a period ′t′ s. If the period of oscillation of bob in air is 10 s, find the value of ′t′. (Neglect frictional force of water, take density of water as 1000 kg/m3)

n balls each of mass m impinge elastically each second on a surface with velocity u. The average force experienced by the surface will be

A cube made of insulating material has uniform charge distribution throughout its volume. Taking the electric potential due to this charged cube at infinity to be zero, the potential at the center is found to be Vo. The potential at one of its corners is

An inductor coil stores U energy when i current is passed through it and dissipates energy at the rate of P. The time constant of the circuit, when this coil is connected across a battery of zero internal resistance is

In the figure shown the current flowing through the resistor of resistance 2 R is

A particle is moving on a circular path of radius 20 m. The speed of particle at any instant is given by the relation v=3t2−5t m/s. What is the magnitude of total acceleration of this particle at t=5 s ?

Both the strings, shown in figure, are made of same material and have same cross-section. The pulleys are light. The wave speed of a transverse wave in the string AB is v1 and in CD it is v2. Then v1v2 is

The kinetic energy of a body of mass 4 kg and having momentum of 6 kg-m/s will be

If x=(6y+4)(3y2+4y+3), then ∫xdy will be

The reduced mass of two particles having masses 4m and 2m is

The ratio of radii of nuclei 13Al27 and 52XP is 3:5. The number of neutrons in the nuclei of X will be

A pulse travelling on a string is represented by the function y=a3(x−vt)2+a2, where a = 5 mm and v=20 cm s−1. Sketch the shape of the string at t = 0, 1s and 2s. Take x = 0 in the middle of the string.

In the diagram shown below, all three rods are of equal length L=1 m and equal mass M=3 kg. The system is rotated such that rod B is the axis. What is the moment of inertia of the system?

Ram goes from point A to B by auto at the speed of 20 km/hr and comes back from B to A in a cab at a speed of 80 km/hr. Find his average speed

Find the greatest length of an organ pipe open at both ends that will have its fundamental frequency in the normal hearing range (20-20,000 Hz). Speed of sound in air = 340ms−1.

In order to find time, the astronaut orbiting in an earth satellite should use

A boy of mass 45 kg, whose leg bones have a cross-sectional area of 5 cm2 and length 50 cm, falls through a height of 2 m without breaking his leg bones. If the bones can withstand a stress of 0.9×108 Nm−2, calculate the Young's modulus for the material of the bone. Use, g=10 ms−2

A standing wave y=A sin (20πx3)cos (1000 π t) is set up in a taut string, where x and y are in metre and t is in seconds. The distance between first two successive points oscillating with the amplitude A2, from the fixed end will be equal to

A particle of mass m is subjected to a force →F=F0[cos(t)^i+sin(t)^j]. If initially (t = 0) the particle was at rest, the kinetic energy of the particle at time t is given by

Across a metallic conductor of non-uniform cross section a constant potential difference is applied. The quantity which remains constant along the conductor is :

Two masses each with mass 0.10 kg are moving with velocity 3 m/s along x axis and 5 m/s along y axis respectively. After an elastic collision, one of the masses moves with a velocity 4^i+4^j. The energy of the other mass after collision is x10 J. Then x is

How to solve complex resistor circuit questions...I mean the proper approach to solve such questions.

The concentric spherical metallic shells, A,B and C of radii a,b and c (a&lt;b&lt;c) have charge densities σ,−σ and σ respectively. If the shells A and C are at the same potential, then the relation between a,b and c is:

The spring block system as shown in figure is in equilibrium. The string connecting blocks A and B is cut. The mass of all the three blocks is m and spring constant of both the spring is k. The amplitude of resulting oscillation of block A is

Which of the following is the correct unit for heat capacity?

What is the relation between spring constant and spring's length?

Define magnetic dipole moment of a current loop

The concentric spherical metallic shells, A,B and C of radii a,b and c (a<b<c) have charge densities σ,−σ and σ respectively. If the shells A and C are at the same potential, then the relation between a,b and c is: