50278 + Interview Questions in Physics

1.	ISRO is planning to place the satellite Aditya-L1- the India’s first dedicated scientific mission to study the sun - at Lagrangian point L1.Consider the following statements: Which of the above statements are incorrect?
Answer» ISRO is planning to place the satellite Aditya-L1- the India’s first dedicated scientific mission to study the sun - at Lagrangian point L1.Consider the following statements: Which of the above statements are incorrect?

Discussion

2.	A large number of free electrons are present in metals. Why there is no current in the absence of electric field across it?
Answer» A large number of free electrons are present in metals. Why there is no current in the absence of electric field across it?

Discussion

3.	A cube of ice of edge of 4 cm is placed in an empty cylindrical glass of inner diameter 6 cm. Assume that the ice melts uniformly from each side such that it always retains its cubical shape. Remembering that ice is lighter than water, find the length of the edge of the ice cube at the instant it just leaves the contact with the bottom of the glass.
Answer» A cube of ice of edge of 4 cm is placed in an empty cylindrical glass of inner diameter 6 cm. Assume that the ice melts uniformly from each side such that it always retains its cubical shape. Remembering that ice is lighter than water, find the length of the edge of the ice cube at the instant it just leaves the contact with the bottom of the glass.

Discussion

4.	A spring of force constant k is cut into two pieces such that one piece is double the length of the other. Then the long piece will have a force constant of :
Answer» A spring of force constant k is cut into two pieces such that one piece is double the length of the other. Then the long piece will have a force constant of :

Discussion

5.	The threshold frequency for a certain photosensitive metal is ν0. When it is illuminated by light of frequency ν=2ν0, the maximum velocity of photoelectrons is v0. What will be the maximum velocity of the photoelectrons when the same metal is illuminated b a light of frequency ν=5ν0?
Answer» The threshold frequency for a certain photosensitive metal is $ν_{0}$ . When it is illuminated by light of frequency $ν = 2 ν_{0}$ , the maximum velocity of photoelectrons is $v_{0}$ . What will be the maximum velocity of the photoelectrons when the same metal is illuminated b a light of frequency $ν = 5 ν_{0}$ ?

Discussion

6.	According to Bohr's theory, the radius of the nth orbit of an atom of atomic number Z is proportional to
Answer» According to Bohr's theory, the radius of the $n^{t h}$ orbit of an atom of atomic number Z is proportional to

Discussion

7.	If the displacement x and velocity v of a particle executing simple harmonic motion are related through the expression 4v2=25−x2, then its time period is
Answer» If the displacement $x$ and velocity $v$ of a particle executing simple harmonic motion are related through the expression $4 v^{2} = 25 - x^{2}$ , then its time period is

Discussion

8.	What will be the coulomb force between two charges, when the distance between them is reduced to half?
Answer» What will be the coulomb force between two charges, when the distance between them is reduced to half?

Discussion

9.	What is the dimension of k/m where k is the force constant and m is the mass of the oscillating object?
Answer» What is the dimension of k/m where k is the force constant and m is the mass of the oscillating object?

Discussion

10.	Two blocks A and B weighing 2 kg and 8 kg respectively are tied with an inextensible string. The coefficient of kinetic and static friction between the blocks and the horizontal surface is 0.25 and 0.3 respectively. If horizontal force F=25 N, then find the acceleration of block A and B.
Answer» Two blocks $A$ and $B$ weighing $2 kg$ and $8 kg$ respectively are tied with an inextensible string. The coefficient of kinetic and static friction between the blocks and the horizontal surface is $0.25$ and $0.3$ respectively. If horizontal force $F = 25 N$ , then find the acceleration of block $A$ and $B$ .

Discussion

11.	A box containing N molecules of a perfect gas at temperature T1 and pressure P1. The number of molecules in the box is doubled keeping the total kinetic energy of the gas same as before. if the new pressure is P2 and temperature T2, then
Answer» A box containing N molecules of a perfect gas at temperature $T_{1}$ and pressure $P_{1}$ . The number of molecules in the box is doubled keeping the total kinetic energy of the gas same as before. if the new pressure is $P_{2}$ and temperature $T_{2}$ , then

Discussion

12.	State the third law of motion.
Answer» State the third law of motion.

Discussion

13.	What will the value of angular magnification be if the final image is formed at near point, instead of infinity?
Answer» What will the value of angular magnification be if the final image is formed at near point, instead of infinity?

Discussion

14.	To explain his theory Bohr used:
Answer» To explain his theory Bohr used:

Discussion

15.	Starting from rest, a body slides down a 45o inclined plane in twice the time it takes to slide down the same distance in the absence of friction. The coefficient of friction between the body and the inclined plane is
Answer» Starting from rest, a body slides down a $45^{o}$ inclined plane in twice the time it takes to slide down the same distance in the absence of friction. The coefficient of friction between the body and the inclined plane is

Discussion

16.	A transverse wave is traveling along a string in the positive x-axis. The figure shows the photograph of the wave at an instant. The points moving upward are _____.
Answer» A transverse wave is traveling along a string in the positive x-axis. The figure shows the photograph of the wave at an instant. The points moving upward are _____.

16.

A transverse wave is traveling along a string in the positive x-axis. The figure shows the photograph of the wave at an instant. The points moving upward are _____.

Answer»

A transverse wave is traveling along a string in the positive x-axis. The figure shows the photograph of the wave at an instant.
The points moving upward are _____.

Discussion

17.	A particle moves along a circle of radius (20π) m with constant tangential acceleration. If velocity of the particle is 80 m/s at the end of the 2nd revolution after the motion has begun, the tangential acceleration is
Answer» A particle moves along a circle of radius $(\frac{20}{π}) m$ with constant tangential acceleration. If velocity of the particle is $80 m/s$ at the end of the $2^{n d}$ revolution after the motion has begun, the tangential acceleration is

Discussion

18.	Two metre scales, one of steel and the other of aluminium, agree at 20∘C. Calculate the ratio aluminium-centimetre/steel-centimetre at (a) 0∘C, (b) 40∘C and (c) 100∘C. α for steel = 1.1×10−5 ∘C−1 and for aluminium = 2.3×10−5 ∘C−1.
Answer» Two metre scales, one of steel and the other of aluminium, agree at $20^{\circ} C$ . Calculate the ratio aluminium-centimetre/steel-centimetre at (a) $0^{\circ} C$ , (b) $40^{\circ} C$ and (c) $100^{\circ} C$ . $α$ for steel = $1.1 \times 10^{- 5}^{\circ} C^{- 1}$ and for aluminium = $2.3 \times 10^{- 5}^{\circ} C^{- 1}$ .

Discussion

19.	When radiation is incident on a photoelectron emitter, the stopping potential is found to be 9 volts. If e/m for the electron is 1.8×1011Ckg−1 the maximum velocity of the ejected electrons is
Answer» When radiation is incident on a photoelectron emitter, the stopping potential is found to be 9 volts. If e/m for the electron is $1.8 \times 10^{11} C k g^{- 1}$ the maximum velocity of the ejected electrons is

Discussion

20.	Q7. Consider the following statements 1. High-thrust Vikas engine and electromechanical actuation system will be inducted into GSAT 6. 2. The high-thrust Vikas engine and other systems would be eventually used in the future missions, including India’s second moon mission, Chandrayaan-II. Which of the statements are correct?
Answer» Q7. Consider the following statements 1. High-thrust Vikas engine and electromechanical actuation system will be inducted into GSAT 6. 2. The high-thrust Vikas engine and other systems would be eventually used in the future missions, including India’s second moon mission, Chandrayaan-II. Which of the statements are correct?

20.

Q7. Consider the following statements 1. High-thrust Vikas engine and electromechanical actuation system will be inducted into GSAT 6. 2. The high-thrust Vikas engine and other systems would be eventually used in the future missions, including India’s second moon mission, Chandrayaan-II. Which of the statements are correct?

Answer»

Q7. Consider the following statements

1. High-thrust Vikas engine and electromechanical actuation system will be inducted into GSAT 6.

2. The high-thrust Vikas engine and other systems would be eventually used in the future missions, including India’s second moon mission, Chandrayaan-II.

Which of the statements are correct?

Discussion

21.	A circular hole of diameter 2.00 cm is made in an aluminium plate at 0∘ C. What will be the diameter at 100∘ C ? α for aluminium = 23×10−5 ∘C−1
Answer» A circular hole of diameter 2.00 cm is made in an aluminium plate at $0^{\circ} C$ . What will be the diameter at $100^{\circ} C$ ? $α$ for aluminium = $23 \times 10^{- 5}^{\circ} C^{- 1}$

Discussion

22.	The Galvanometer works on the principle that the angle of turn of the device, θ is
Answer» The Galvanometer works on the principle that the angle of turn of the device, $θ$ is

Discussion

23.	The boiling point of 0.1 molal K4[Fe(CN)6] solution will be (Kb for water = 0.52 K.Kg mole−1)
Answer» The boiling point of 0.1 molal $K_{4} [F e (C N)_{6}]$ solution will be ( $K_{b}$ for water = 0.52 K.Kg $m o l e^{- 1}$ )

Discussion

24.	A battery of emf E0=12 V is connected across a 4 m long uniform wire having resistance 4 Ω/m. The cells of small emfs ϵ1=2 V and ϵ2=4 V having internal resistance 2 Ω and 6 Ω respectively, are connected as shown in the figure. If galvanometer shows no deflection at the point N, the distance of point N from the point A is equal to
Answer» A battery of emf $E_{0} = 12 V$ is connected across a $4 m$ long uniform wire having resistance $4 Ω / m$ . The cells of small emfs $ϵ_{1} = 2 V$ and $ϵ_{2} = 4 V$ having internal resistance $2 Ω$ and $6 Ω$ respectively, are connected as shown in the figure. If galvanometer shows no deflection at the point $N$ , the distance of point $N$ from the point $A$ is equal to

Discussion

25.	Solve the previous problem if the coefficient of restitution is e. Use θ=45∘,e=34 and h=5 m.
Answer» Solve the previous problem if the coefficient of restitution is e. Use $θ = 45^{\circ}, e = \frac{3}{4} a n d h = 5 m$ .

Discussion

26.	I-V graph for a mettallic wire at two different temperatures, T1 and T2 is as shown in the figure. Which of the two temperature is lower and why?
Answer» I-V graph for a mettallic wire at two different temperatures, $T_{1}$ and $T_{2}$ is as shown in the figure. Which of the two temperature is lower and why?

Discussion

27.	In the figure, a ladder of mass m is shown leaning against a wall. It is in static equilibrium making an angle θ with the horizontal floor. The coefficient of friction between the wall and the ladder is μ and that between the floor and the ladder is μ2. The normal reaction of the wall on the ladder is N1 and that of the floor is N2. If the ladder is about to slip, then
Answer» In the figure, a ladder of mass m is shown leaning against a wall. It is in static equilibrium making an angle $θ$ with the horizontal floor. The coefficient of friction between the wall and the ladder is $μ$ and that between the floor and the ladder is $μ_{2} .$ The normal reaction of the wall on the ladder is $N_{1}$ and that of the floor is $N_{2} .$ If the ladder is about to slip, then

Discussion

28.	If uncertainty in position and momentum are equal, the uncertainty in velocity is:
Answer» If uncertainty in position and momentum are equal, the uncertainty in velocity is:

Discussion

29.	A particle is moving in conservative field. If work done by field to move particle from A to B is W1, from B to C is W2 and from C to A is W3, then
Answer» A particle is moving in conservative field. If work done by field to move particle from A to B is $W_{1}$ , from B to C is $W_{2}$ and from C to A is $W_{3}$ , then

Discussion

30.	The Young's double slit experiment is performed with blue light and green light of wavelength 4360˙A and 5460˙A a respectively. If X is the distance of 4th maxima, from the central one, then:
Answer» The Young's double slit experiment is performed with blue light and green light of wavelength $4360 ˙ A$ and $5460 ˙ A$ a respectively. If X is the distance of $4^{t h}$ maxima, from the central one, then:

Discussion

31.	Three particles A, B & C of masses 4m, 2m & 3m are placed on the vertices of a equilateral triangle of length 2L as shown in the figure. Find out the perpendicular distance of centre of mass from the side AB.
Answer» Three particles $A, B$ & $C$ of masses $4 m, 2 m$ & $3 m$ are placed on the vertices of a equilateral triangle of length $2 L$ as shown in the figure. Find out the perpendicular distance of centre of mass from the side $AB$ .

Discussion

32.	Find the moment of Inertia of a uniform hollow sphere of mass M and radius R, about its diameter
Answer» Find the moment of Inertia of a uniform hollow sphere of mass $M$ and radius $R$ , about its diameter

32.

Find the moment of Inertia of a uniform hollow sphere of mass M and radius R, about its diameter

Answer»

Find the moment of Inertia of a uniform hollow sphere of mass $M$ and radius $R$ , about its diameter

Discussion

33.	If a capacitor of 10μF is charged to 10V and then connected to a new circuit to discharge through a 10Ω resistor, what is the charge on it after 20μs?
Answer» If a capacitor of $10 μ F$ is charged to 10V and then connected to a new circuit to discharge through a $10 Ω$ resistor, what is the charge on it after $20 μ s$ ?

Discussion

34.	What is mechanical energy? Give two examples where a body can be said to have mechanical energy.
Answer» What is mechanical energy? Give two examples where a body can be said to have mechanical energy.

Discussion

35.	What is the equivalent resistance of an ammeter that has a coil resistance of 1k Ω, and a shunt resistance of 1 Ω?
Answer» What is the equivalent resistance of an ammeter that has a coil resistance of $1 k Ω$ , and a shunt resistance of $1 Ω$ ?

Discussion

36.	Two rods, one of aluminium and the other of steel, having initial length l1 and l2 respectively are connected together to form a single rod of length l1+l2. The coefficients of linear expansion for aluminium and steel are αa and αs respectively. If the length of each rod increases by the same amount when their temperatures are raised by t ∘C, then find the ratio l1/(l1+l2)
Answer» Two rods, one of aluminium and the other of steel, having initial length $l_{1}$ and $l_{2}$ respectively are connected together to form a single rod of length $l_{1} + l_{2}$ . The coefficients of linear expansion for aluminium and steel are $α_{a}$ and $α_{s}$ respectively. If the length of each rod increases by the same amount when their temperatures are raised by $t^{\circ} C$ , then find the ratio $l_{1} / (l_{1} + l_{2})$

Discussion

37.	The electric field due to an infinitely long line of charge at a point is 10 N/c. What is the electric field magnitude at a point which is twice as far from the line of charge
Answer» The electric field due to an infinitely long line of charge at a point is 10 N/c. What is the electric field magnitude at a point which is twice as far from the line of charge

Discussion

38.	Integrate:∫dt6t−1
Answer» Integrate: $\int \frac{d t}{6 t - 1}$

Discussion

39.	A vessel is partitioned in two equal halves by a fixed diathermic seperator. Two different ideal gases are filled in the left(L) and right(R) halves. The rms speed of the molecules in L part is equal to the mean speed in the R part. Then the ratio of the mass of a molecule in L part to that of a molecule in R part is
Answer» A vessel is partitioned in two equal halves by a fixed diathermic seperator. Two different ideal gases are filled in the left( $L$ ) and right( $R$ ) halves. The rms speed of the molecules in $L$ part is equal to the mean speed in the $R$ part. Then the ratio of the mass of a molecule in $L$ part to that of a molecule in $R$ part is

Discussion

40.	In the P-V diagram shown in figure, ABC is a semicircle. The work done in the process ABC is
Answer» In the P-V diagram shown in figure, ABC is a semicircle. The work done in the process ABC is

40.

In the P-V diagram shown in figure, ABC is a semicircle. The work done in the process ABC is

Answer»

In the P-V diagram shown in figure, ABC is a semicircle. The work done in the process ABC is

Discussion

41.	A string of length L is stretched by L/20 and speed of transverse wave along it is v. The speed of wave when it is stretched by L/10 will be (assume that Hooke's law is applicable)
Answer» A string of length L is stretched by L/20 and speed of transverse wave along it is v. The speed of wave when it is stretched by L/10 will be (assume that Hooke's law is applicable)

Discussion

42.	A cubical block of mass m slides in an inclined right angled trough as shown in the figure. If the coefficients of kinetic friction between block and material composing the trough is μk, find the acceleration of the block. (Both walls of the trough make an angle of 45∘ with the inclined plane)
Answer» A cubical block of mass $m$ slides in an inclined right angled trough as shown in the figure. If the coefficients of kinetic friction between block and material composing the trough is $μ_{k}$ , find the acceleration of the block. (Both walls of the trough make an angle of 45 ^∘ with the inclined plane)

42.

A cubical block of mass m slides in an inclined right angled trough as shown in the figure. If the coefficients of kinetic friction between block and material composing the trough is μk, find the acceleration of the block. (Both walls of the trough make an angle of 45∘ with the inclined plane)

Answer»

A cubical block of mass $m$ slides in an inclined right angled trough as shown in the figure. If the coefficients of kinetic friction between block and material composing the trough is $μ_{k}$ , find the acceleration of the block. (Both walls of the trough make an angle of 45

^∘

with the inclined plane)

Discussion

43.	In the figure shown, if the block does not slide down the plane when a force of 10 N is applied perpendicular to the plane, find the coefficient of static friction between the plane and the block. Take g=10 m/s2
Answer» In the figure shown, if the block does not slide down the plane when a force of $10 N$ is applied perpendicular to the plane, find the coefficient of static friction between the plane and the block. Take $g = 10 m / s^{2}$

Discussion

44.	A circular race track of radius 85 m is banked at angle of 37∘ If the coefficient of friction between the wheels of a race-car and the road is 0.2, then the maximum possible speed to avoid slipping is (tan 37∘=34)
Answer» A circular race track of radius $85 m$ is banked at angle of $37^{\circ}$ If the coefficient of friction between the wheels of a race-car and the road is $0.2$ , then the maximum possible speed to avoid slipping is $(tan 37^{\circ} = \frac{3}{4})$

Discussion

45.	The electric potential inside a charged sphere depends on the distance from its center as V=ar2+b where a and b are constants. The space charge distribution ρ(r) inside the sphere is given by
Answer» The electric potential inside a charged sphere depends on the distance from its center as $V = a r^{2} + b$ where a and b are constants. The space charge distribution $ρ (r)$ inside the sphere is given by

Discussion

46.	A small solid cylinder of radius r and mass M slides down a smooth hill of height h from rest and gets onto the plank of mass M lying on the smooth horizontal plane at the base of the hill as shown in the figure. Due to friction between the cylinder and plank, the cylinder slows down and starts rolling without friction over the plank. While the cylinder is rolling (without sliding) over the plank, the velocity of the plank is vp, the velocity of centre of mass of the cylinder is vc and angular velocity of the cylinder is “ω”. The coefficient of friction between the cylinder and plank is μ , while gravity (g) is uniform in the space. [Assume that height of the plank is negligible.] The fraction of initial mechanical energy that is lost due to friction is
Answer» A small solid cylinder of radius r and mass M slides down a smooth hill of height h from rest and gets onto the plank of mass M lying on the smooth horizontal plane at the base of the hill as shown in the figure. Due to friction between the cylinder and plank, the cylinder slows down and starts rolling without friction over the plank. While the cylinder is rolling (without sliding) over the plank, the velocity of the plank is $v_{p}$ , the velocity of centre of mass of the cylinder is $v_{c}$ and angular velocity of the cylinder is “ $ω$ ”. The coefficient of friction between the cylinder and plank is $μ$ , while gravity (g) is uniform in the space. [Assume that height of the plank is negligible.] The fraction of initial mechanical energy that is lost due to friction is

Discussion

47.	A cylindrical conducting piston of mass M slides smoothly inside a long cylinder closed at one end, enclosing a certain mass of a gas. The cylinder is kept with its axis horizontal. If the piston is disturbed from its equilibrium position, it oscillates simple harmonically. The period of oscillation will be (process is isothermal)
Answer» A cylindrical conducting piston of mass $M$ slides smoothly inside a long cylinder closed at one end, enclosing a certain mass of a gas. The cylinder is kept with its axis horizontal. If the piston is disturbed from its equilibrium position, it oscillates simple harmonically. The period of oscillation will be (process is isothermal)

Discussion

48.	The second overtone of an open organ pipe has the same frequency as the first overtone of a closed pipe L metres long. The length of the open pipe will be
Answer» The second overtone of an open organ pipe has the same frequency as the first overtone of a closed pipe $L$ metres long. The length of the open pipe will be

Discussion

49.	A current is flowing through a thin cylindrical shell of radius R. If energy density in the medium, due to magnetic field, at a distance r from the axis of the shell is equal to U, then which of the following graphs is correct?
Answer» A current is flowing through a thin cylindrical shell of radius $R$ . If energy density in the medium, due to magnetic field, at a distance $r$ from the axis of the shell is equal to $U$ , then which of the following graphs is correct?

Discussion

50.	Find the moment of inertia of a uniform square plate of mass m and edge a about one of its diagonals.
Answer» Find the moment of inertia of a uniform square plate of mass m and edge a about one of its diagonals.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

ISRO is planning to place the satellite Aditya-L1- the India’s first dedicated scientific mission to study the sun - at Lagrangian point L1.Consider the following statements: Which of the above statements are incorrect?

A large number of free electrons are present in metals. Why there is no current in the absence of electric field across it?

A spring of force constant k is cut into two pieces such that one piece is double the length of the other. Then the long piece will have a force constant of :

The threshold frequency for a certain photosensitive metal is ν0. When it is illuminated by light of frequency ν=2ν0, the maximum velocity of photoelectrons is v0. What will be the maximum velocity of the photoelectrons when the same metal is illuminated b a light of frequency ν=5ν0?

According to Bohr's theory, the radius of the nth orbit of an atom of atomic number Z is proportional to

If the displacement x and velocity v of a particle executing simple harmonic motion are related through the expression 4v2=25−x2, then its time period is

What will be the coulomb force between two charges, when the distance between them is reduced to half?

What is the dimension of k/m where k is the force constant and m is the mass of the oscillating object?

Two blocks A and B weighing 2 kg and 8 kg respectively are tied with an inextensible string. The coefficient of kinetic and static friction between the blocks and the horizontal surface is 0.25 and 0.3 respectively. If horizontal force F=25 N, then find the acceleration of block A and B.

A box containing N molecules of a perfect gas at temperature T1 and pressure P1. The number of molecules in the box is doubled keeping the total kinetic energy of the gas same as before. if the new pressure is P2 and temperature T2, then

State the third law of motion.

What will the value of angular magnification be if the final image is formed at near point, instead of infinity?

To explain his theory Bohr used:

Starting from rest, a body slides down a 45o inclined plane in twice the time it takes to slide down the same distance in the absence of friction. The coefficient of friction between the body and the inclined plane is

A transverse wave is traveling along a string in the positive x-axis. The figure shows the photograph of the wave at an instant. The points moving upward are _____.

A particle moves along a circle of radius (20π) m with constant tangential acceleration. If velocity of the particle is 80 m/s at the end of the 2nd revolution after the motion has begun, the tangential acceleration is

Two metre scales, one of steel and the other of aluminium, agree at 20∘C. Calculate the ratio aluminium-centimetre/steel-centimetre at (a) 0∘C, (b) 40∘C and (c) 100∘C. α for steel = 1.1×10−5 ∘C−1 and for aluminium = 2.3×10−5 ∘C−1.

When radiation is incident on a photoelectron emitter, the stopping potential is found to be 9 volts. If e/m for the electron is 1.8×1011Ckg−1 the maximum velocity of the ejected electrons is

A circular hole of diameter 2.00 cm is made in an aluminium plate at 0∘ C. What will be the diameter at 100∘ C ? α for aluminium = 23×10−5 ∘C−1

The Galvanometer works on the principle that the angle of turn of the device, θ is

The boiling point of 0.1 molal K4[Fe(CN)6] solution will be (Kb for water = 0.52 K.Kg mole−1)

Solve the previous problem if the coefficient of restitution is e. Use θ=45∘,e=34 and h=5 m.

I-V graph for a mettallic wire at two different temperatures, T1 and T2 is as shown in the figure. Which of the two temperature is lower and why?

If uncertainty in position and momentum are equal, the uncertainty in velocity is:

A particle is moving in conservative field. If work done by field to move particle from A to B is W1, from B to C is W2 and from C to A is W3, then

The Young's double slit experiment is performed with blue light and green light of wavelength 4360˙A and 5460˙A a respectively. If X is the distance of 4th maxima, from the central one, then:

Three particles A, B &amp; C of masses 4m, 2m &amp; 3m are placed on the vertices of a equilateral triangle of length 2L as shown in the figure. Find out the perpendicular distance of centre of mass from the side AB.

Find the moment of Inertia of a uniform hollow sphere of mass M and radius R, about its diameter

If a capacitor of 10μF is charged to 10V and then connected to a new circuit to discharge through a 10Ω resistor, what is the charge on it after 20μs?

What is mechanical energy? Give two examples where a body can be said to have mechanical energy.

What is the equivalent resistance of an ammeter that has a coil resistance of 1k Ω, and a shunt resistance of 1 Ω?

The electric field due to an infinitely long line of charge at a point is 10 N/c. What is the electric field magnitude at a point which is twice as far from the line of charge

Integrate:∫dt6t−1

In the P-V diagram shown in figure, ABC is a semicircle. The work done in the process ABC is

A string of length L is stretched by L/20 and speed of transverse wave along it is v. The speed of wave when it is stretched by L/10 will be (assume that Hooke's law is applicable)

A cubical block of mass m slides in an inclined right angled trough as shown in the figure. If the coefficients of kinetic friction between block and material composing the trough is μk, find the acceleration of the block. (Both walls of the trough make an angle of 45∘ with the inclined plane)

In the figure shown, if the block does not slide down the plane when a force of 10 N is applied perpendicular to the plane, find the coefficient of static friction between the plane and the block. Take g=10 m/s2

A circular race track of radius 85 m is banked at angle of 37∘ If the coefficient of friction between the wheels of a race-car and the road is 0.2, then the maximum possible speed to avoid slipping is (tan 37∘=34)

The electric potential inside a charged sphere depends on the distance from its center as V=ar2+b where a and b are constants. The space charge distribution ρ(r) inside the sphere is given by

The second overtone of an open organ pipe has the same frequency as the first overtone of a closed pipe L metres long. The length of the open pipe will be

A current is flowing through a thin cylindrical shell of radius R. If energy density in the medium, due to magnetic field, at a distance r from the axis of the shell is equal to U, then which of the following graphs is correct?

Find the moment of inertia of a uniform square plate of mass m and edge a about one of its diagonals.

Three particles A, B & C of masses 4m, 2m & 3m are placed on the vertices of a equilateral triangle of length 2L as shown in the figure. Find out the perpendicular distance of centre of mass from the side AB.