50278 + Interview Questions in Physics

1.	The point from where a ball is projected is taken as the origin of co-ordinate system. The components of its displacement along x and y are given by x = 6t and y=8t−5t2. What is the velocity and angle of projection?
Answer» The point from where a ball is projected is taken as the origin of co-ordinate system. The components of its displacement along x and y are given by x = 6t and $y = 8 t - 5 t^{2}$ . What is the velocity and angle of projection?

Discussion

2.	A solid sphere rolls down on an inclined plane. If inclination angle is 30∘ and friction is sufficient for rolling while not slipping, find a (accelaration) of center of sphere.
Answer» A solid sphere rolls down on an inclined plane. If inclination angle is $30^{\circ}$ and friction is sufficient for rolling while not slipping, find $a$ (accelaration) of center of sphere.

Discussion

3.	A circular coil of radius ‘r’ carries a current I. At what distance from centre on its axis the magnetic field is 127th of its value at the centre?
Answer» A circular coil of radius ‘r’ carries a current I. At what distance from centre on its axis the magnetic field is $\frac{1}{27} t h$ of its value at the centre?

Discussion

4.	Please help me to convert 1kWh into J using dimensional analysis.
Answer» Please help me to convert 1kWh into J using dimensional analysis.

Discussion

5.	How to prepare rotation up to adv level how to start prep
Answer» How to prepare rotation up to adv level how to start prep

Discussion

6.	An object having a velocity 4.0 ms is accelerated at the rate of 1.2 ms2 for 5.0 s. Find the distance travelled during the period of acceleration.
Answer» An object having a velocity 4.0 $\frac{m}{s}$ is accelerated at the rate of 1.2 $\frac{m}{s^{2}}$ for 5.0 s. Find the distance travelled during the period of acceleration.

Discussion

7.	Evaporation is a __________ phenomenon whereas Boiling is a __________ process.
Answer» Evaporation is a __________ phenomenon whereas Boiling is a __________ process.

Discussion

8.	A vessel of volume 8×10−3m3 contains and Ideal gas at 300k and 210 K Pa the gas is allowed to leak till the pressure falls to 135 K Pa. Calculate the amount of the gas in moles leaked assuming the temperature remains constant.
Answer» A vessel of volume $8 \times 10^{- 3} m^{3}$ contains and Ideal gas at 300k and 210 K Pa the gas is allowed to leak till the pressure falls to 135 K Pa. Calculate the amount of the gas in moles leaked assuming the temperature remains constant.

Discussion

9.

In the diagram below, Ram holds the rod with force F. Column II of the table gives the readings shown by the weighing machine (W.M.) for various values of F given in Column-I. Then choose the correct matching. (All forces are in newtons) Force F (in N) List - I Reading of weighing machine (in N) List - II P. 0 1. 1000 Q. 200 2. 900 R. 300 3. 1200 S. 500 4. 700

Answer»

In the diagram below, Ram holds the rod with force $F$ . Column II of the table gives the readings shown by the weighing machine $(W.M.)$ for various values of $F$ given in Column-I. Then choose the correct matching. (All forces are in newtons)

Force $F$ (in $N$ ) List - I	Reading of weighing machine (in $N$ ) List - II
$P .$ $0$	$1.$ $1000$
$Q .$ $200$	$2.$ $900$
$R .$ $300$	$3.$ $1200$
$S .$ $500$	$4.$ $700$

Discussion

10.	identical condensers are joined in parallel and are charged to potential V . Now they are separated and joined in series. Then the total energy and potential difference of the combination will be
Answer» identical condensers are joined in parallel and are charged to potential V . Now they are separated and joined in series. Then the total energy and potential difference of the combination will be

Discussion

11.	∫2+x+√(2x2+x3)x+√2+x dx,x>0
Answer» $\int \frac{2 + x + \sqrt{(2 x^{2} + x^{3})}}{x + \sqrt{2 + x}} d x, x > 0$

Discussion

12.	Which of the following devices performs the same function as a voltmeter?
Answer» Which of the following devices performs the same function as a voltmeter?

Discussion

13.	Given that x=2p and y=4q, then value of log2(x3y) is
Answer» Given that $x = 2^{p}$ and $y = 4^{q}$ , then value of ${log}_{2} (x^{3} y)$ is

Discussion

14.	A current I flows in a long thin walled cylinder of radius R. What pressure do the walls of the cylinder experience?
Answer» A current I flows in a long thin walled cylinder of radius R. What pressure do the walls of the cylinder experience?

Discussion

15.	A mild-steel wire of length 2L and cross-sectional area A is stretched well within elastic limit horizontally between two pillars and a mass m is suspended from the midpoint of the wire as shown in figure. If strain in the wire is equal to n×x2L2. The value of n is .(Assume x<<L)
Answer» A mild-steel wire of length $2 L$ and cross-sectional area $A$ is stretched well within elastic limit horizontally between two pillars and a mass $m$ is suspended from the midpoint of the wire as shown in figure. If strain in the wire is equal to $n \times \frac{x^{2}}{L^{2}}$ . The value of $n$ is .(Assume $x << L$ )

Discussion

16.	When a cylindrical tube is dipped vertically into a liquid, the angle of contact is 140∘. When the tube is dipped with an inclination of 40∘, the angle of contact is:
Answer» When a cylindrical tube is dipped vertically into a liquid, the angle of contact is $140^{\circ}$ . When the tube is dipped with an inclination of $40^{\circ}$ , the angle of contact is:

Discussion

17.	The plots of intensity versus wavelength of three black bodies at temperatures T1,T2 and T3 respectively are shown in figure. Their temperatures are such that
Answer» The plots of intensity versus wavelength of three black bodies at temperatures $T_{1}, T_{2} a n d T_{3}$ respectively are shown in figure. Their temperatures are such that

17.

The plots of intensity versus wavelength of three black bodies at temperatures T1,T2 and T3 respectively are shown in figure. Their temperatures are such that

Answer»

The plots of intensity versus wavelength of three black bodies at temperatures $T_{1}, T_{2} a n d T_{3}$ respectively are shown in figure. Their temperatures are such that

Discussion

18.	Two blocks, each having a mass M, rest on frictionless surfaces as shown in the figure. If the pulleys are light and frictionless, and M on the incline is allowed to move down along the incline, then the tension in the string will be
Answer» Two blocks, each having a mass $M$ , rest on frictionless surfaces as shown in the figure. If the pulleys are light and frictionless, and $M$ on the incline is allowed to move down along the incline, then the tension in the string will be

Discussion

19.	The plots for intensity versus wavelength for three black bodies at temperatures T1, T2, T3 respectively are shown in figure. Their temperatures are such that
Answer» The plots for intensity versus wavelength for three black bodies at temperatures $T_{1}, T_{2}, T_{3}$ respectively are shown in figure. Their temperatures are such that

Discussion

20.	An object is released from rest. The time it takes to fall through a distance h and the speed of the object as it falls through this distance are measured with a pendulum clock. The entire apparatus is taken on the moon and the experiment is repeated. Then?
Answer» An object is released from rest. The time it takes to fall through a distance h and the speed of the object as it falls through this distance are measured with a pendulum clock. The entire apparatus is taken on the moon and the experiment is repeated. Then?

Discussion

21.	A sample of an ideal gas occupies volume V at a pressure P and absolute temperature T. The mass of each molecule is m. Which of the following expressions gives the density of the gas?
Answer» A sample of an ideal gas occupies volume V at a pressure P and absolute temperature T. The mass of each molecule is m. Which of the following expressions gives the density of the gas?

Discussion

22.	A stone of mass 0.05 kg is thrown vertically upwards. What is the direction and magnitude of net force on the stone during its upward motion?
Answer» A stone of mass 0.05 kg is thrown vertically upwards. What is the direction and magnitude of net force on the stone during its upward motion?

Discussion

23.	The moment of inertia of a body about a given axis is 1.2 kg−m2. Initially, the body is at rest. In order to produce a rotational KE of 1500 joule, an angular acceleration of 25 rad/sec2 must be applied about that axis for the duration of- (correct answer + 1, wrong answer - 0.25)
Answer» The moment of inertia of a body about a given axis is $1.2 k g - m^{2}$ . Initially, the body is at rest. In order to produce a rotational $KE$ of $1500 joule$ , an angular acceleration of $25 {rad/sec}^{2}$ must be applied about that axis for the duration of- (correct answer + 1, wrong answer - 0.25)

Discussion

24.	A drum of radius 0.6 m carrying the load A is rigidly attached to a pulley of radius 0.9 m carrying the load B as shown. At the time t=0, the load B moves with a velocity of 2 ms−1 (downward) and a constant acceleration of 3 ms−2 (downward). Over the time interval 0≤t≤2s, determine the number of revolutions executed by the pulley and the displacement of the load A.
Answer» A drum of radius $0.6 m$ carrying the load $A$ is rigidly attached to a pulley of radius $0.9 m$ carrying the load $B$ as shown. At the time $t = 0$ , the load $B$ moves with a velocity of $2 m s^{- 1}$ (downward) and a constant acceleration of $3 m s^{- 2}$ (downward). Over the time interval $0 \leq t \leq 2 s,$ determine the number of revolutions executed by the pulley and the displacement of the load $A$ .

Discussion

25.	Three rings each of mass, m and radius, r are placed in a plane touching each other as shown. The radius of gyration of the system about the axis as shown in the figure is
Answer» Three rings each of mass, m and radius, r are placed in a plane touching each other as shown. The radius of gyration of the system about the axis as shown in the figure is

Discussion

26.	A satellite is moving in elliptical orbit around a fixed planet. If eccentricity of ellipse is e = 0.4 then ratio of maximum speed to minimum speed of satellite is (Answer upto two digits after the decimal point.)
Answer» A satellite is moving in elliptical orbit around a fixed planet. If eccentricity of ellipse is e = 0.4 then ratio of maximum speed to minimum speed of satellite is (Answer upto two digits after the decimal point.)

Discussion

27.	If the critical angle for total internal reflection from a medium to vacuum is 300 , the velocity of light in the medium is
Answer» If the critical angle for total internal reflection from a medium to vacuum is $30^{0}$ , the velocity of light in the medium is

Discussion

28.	A particle executes simple harmonic motion with a frequency f. The frequency with which its kinetic energy oscillates is
Answer» A particle executes simple harmonic motion with a frequency f. The frequency with which its kinetic energy oscillates is

Discussion

29.	A stone of relative density K is released from rest on the surface of a lake. If various effects are ignored, the stone sinks in water with an acceleration of
Answer» A stone of relative density K is released from rest on the surface of a lake. If various effects are ignored, the stone sinks in water with an acceleration of

Discussion

30.	A potential difference is applied to the plate of a capacitor filled with an insulator, with energy stored in the capacitor as U. The capacitor is disconnected and the insulator is pulled out now. The work done in pulling out the insulator against electric field is 4U. Find the dielectric constant of the insulator. ___
Answer» A potential difference is applied to the plate of a capacitor filled with an insulator, with energy stored in the capacitor as U. The capacitor is disconnected and the insulator is pulled out now. The work done in pulling out the insulator against electric field is 4U. Find the dielectric constant of the insulator. ___

Discussion

31.	A wire carrying current I has the shape as shown in the figure. Linear parts of the wire are very long and parallel to X-axis while semi-circular portion of radius R is lying in Y−Z plane. Magnetic field at point O is
Answer» A wire carrying current $I$ has the shape as shown in the figure. Linear parts of the wire are very long and parallel to $X$ -axis while semi-circular portion of radius $R$ is lying in $Y - Z$ plane. Magnetic field at point $O$ is

Discussion

32.	An object of mass m is tied to a string of length l and a variable force F is applied on it which brings the string gradually to an angle θ with the vertical. The work done by the force F is
Answer» An object of mass m is tied to a string of length l and a variable force F is applied on it which brings the string gradually to an angle $θ$ with the vertical. The work done by the force F is

32.

An object of mass m is tied to a string of length l and a variable force F is applied on it which brings the string gradually to an angle θ with the vertical. The work done by the force F is

Answer»

An object of mass m is tied to a string of length l and a variable force F is applied on it which brings the string gradually to an angle $θ$ with the vertical. The work done by the force F is

Discussion

33.	A frictionless cart of mass M carries two other frictionless carts having masses m1 and m2 connected by a string passing over a pulley as shown in figure. The horizontal force that must be applied on M, so that m1 and m2 do not move relative to it will be
Answer» A frictionless cart of mass $M$ carries two other frictionless carts having masses $m_{1}$ and $m_{2}$ connected by a string passing over a pulley as shown in figure. The horizontal force that must be applied on $M,$ so that $m_{1}$ and $m_{2}$ do not move relative to it will be

Discussion

34.	A particle moves in space along the path z=ax3+by2, in such a way that dxdt=c=dydt where a, b and c are constants. The acceleration of the particle is:
Answer» A particle moves in space along the path $z = a x^{3} + b y^{2}$ , in such a way that $\frac{d x}{d t} = c = \frac{d y}{d t}$ where a, b and c are constants. The acceleration of the particle is:

34.

A particle moves in space along the path z=ax3+by2, in such a way that dxdt=c=dydt where a, b and c are constants. The acceleration of the particle is:

Answer»

A particle moves in space along the path $z = a x^{3} + b y^{2}$ , in such a way that $\frac{d x}{d t} = c = \frac{d y}{d t}$ where a, b and c are constants. The acceleration of the particle is:

Discussion

35.	State and Explain Gauss’ theorem.
Answer» State and Explain Gauss’ theorem.

Discussion

36.	Find the minimum coefficient of friction between the cylindrical shell and inclined plane as shown in the figure, so that the shell will perform pure rolling.
Answer» Find the minimum coefficient of friction between the cylindrical shell and inclined plane as shown in the figure, so that the shell will perform pure rolling.

Discussion

37.	Find the reading of the spring balance considering spring, pulley and string to be massless.
Answer» Find the reading of the spring balance considering spring, pulley and string to be massless.

Discussion

38.	Velocity of a particle travelling along a straight line represented by +ve x-axis is given by 4 0≤t≤5 v (m/s) = 2t 6≤t<10 6t2 10≤t≤20 Find out the distance travelled by the particle between t=4 s to t=12 s.
Answer» Velocity of a particle travelling along a straight line represented by $+ v e$ $x$ -axis is given by $4$ $0 \leq t \leq 5$ $v (m/s)$ $=$ $2 t$ $6 \leq t < 10$ $6 t^{2}$ $10 \leq t \leq 20$ Find out the distance travelled by the particle between $t = 4 s$ to $t = 12 s$ .

Discussion

39.	An LCR circuit contains resistance of 100 Ω and a supply of 200 V at 300 rad/s angular frequency. If only capacitor is taken out from the circuit and the rest of the circuit is joined, current lags behind the voltage by 60∘. If, on the other hand, only inductor is taken out, the current leads by 60∘ with the applied voltage. The current flowing in the circuit is
Answer» An LCR circuit contains resistance of $100 Ω$ and a supply of $200 V$ at $300 rad/s$ angular frequency. If only capacitor is taken out from the circuit and the rest of the circuit is joined, current lags behind the voltage by $60^{\circ}$ . If, on the other hand, only inductor is taken out, the current leads by $60^{\circ}$ with the applied voltage. The current flowing in the circuit is

Discussion

40.	At a given instant, block A is moving upwards with velocity of 5 m/s, what is velocity of block B at that instant? Assume that the strings are inextensible and pulleys are frictionless.
Answer» At a given instant, block A is moving upwards with velocity of $5 m / s$ , what is velocity of block B at that instant? Assume that the strings are inextensible and pulleys are frictionless.

Discussion

41.	A particle is found to be at rest when seen from a frame S1 and moving with a constant velocity when seen from another frame S2. Mark out the possible options.
Answer» A particle is found to be at rest when seen from a frame $S_{1}$ and moving with a constant velocity when seen from another frame $S_{2}$ . Mark out the possible options.

Discussion

42.	Ratio of minimum kinetic energies of two projectiles of same mass is 4:1. The ratio of the maximum height attained by them is also 4:1. The ratio of their ranges would be
Answer» Ratio of minimum kinetic energies of two projectiles of same mass is $4 : 1$ . The ratio of the maximum height attained by them is also $4 : 1$ . The ratio of their ranges would be

Discussion

43.	Electric field lines never form closed loops as they are conservative in nature. Explain how? What is the link between being conservative and not forming closed loops?
Answer» Electric field lines never form closed loops as they are conservative in nature. Explain how? What is the link between being conservative and not forming closed loops?

Discussion

44.	In the circuit shown in figure switch S is thrown to position 1 at t=0. When the currect in the resistor is 1 A, it is shifted to position 2. The total heat generated in the circuit after shifting to position 2 is
Answer» In the circuit shown in figure switch $S$ is thrown to position $1$ at $t = 0$ . When the currect in the resistor is $1 A$ , it is shifted to position 2. The total heat generated in the circuit after shifting to position 2 is

Discussion

45.	A particle is projected from the ground with an initial velocity of 20 m/s at an angle of 30∘ with horizontal. The magnitude of change in velocity in a time interval from t=0 to t=0.5 s is (g=10 m/s2)
Answer» A particle is projected from the ground with an initial velocity of $20 m / s$ at an angle of $30^{\circ}$ with horizontal. The magnitude of change in velocity in a time interval from $t = 0$ to $t = 0.5 s$ is $(g = 10 m / s^{2})$

Discussion

46.	Two small balls A and B, each of mass m, are attached rigidly to the ends of a light rod of length d. The structure rotates about the perpendicular bisector of the rod at an angular speed ω. Calculate the angular momentum of the system about the axis of rotation.
Answer» Two small balls A and B, each of mass m, are attached rigidly to the ends of a light rod of length d. The structure rotates about the perpendicular bisector of the rod at an angular speed $ω$ . Calculate the angular momentum of the system about the axis of rotation.

46.

Two small balls A and B, each of mass m, are attached rigidly to the ends of a light rod of length d. The structure rotates about the perpendicular bisector of the rod at an angular speed ω. Calculate the angular momentum of the system about the axis of rotation.

Answer»

Two small balls A and B, each of mass m, are attached rigidly to the ends of a light rod of length d. The structure rotates about the perpendicular bisector of the rod at an angular speed $ω$ . Calculate the angular momentum of the system about the axis of rotation.

Discussion

47.	A ball takes t second to fall from a height h1 and 2t seconds to fall from a height h2. Then h1h2 is:
Answer» A ball takes $t$ second to fall from a height $h_{1}$ and $2 t$ seconds to fall from a height $h_{2}$ . Then $\frac{h_{1}}{h_{2}}$ is:

Discussion

48.	For an adiabatic expansion of an ideal gas, the fractional change in its pressure is equal to
Answer» For an adiabatic expansion of an ideal gas, the fractional change in its pressure is equal to

Discussion

49.	A laddre 5 m long is leaning against a wall. The bottom of the ladder is pulled along the ground, away from the wall, at the rate of 2 m/s. How fast is its height on the wall decreasing when the foot of the ladder is 4 m away from the wall?
Answer» A laddre 5 m long is leaning against a wall. The bottom of the ladder is pulled along the ground, away from the wall, at the rate of 2 m/s. How fast is its height on the wall decreasing when the foot of the ladder is 4 m away from the wall?

Discussion

50.

A potential difference of 600 V is applied across the plates of a parallel plate capacitor. The separation between the plates is 3 mm. An electron projected parallel to the plates as shown with a speed of 2×106 m-1 moves undeflected between the plates. The magnitude and direction of the magnetic field is

Answer»

A potential difference of 600 V is applied across the plates of a parallel plate capacitor. The separation between the plates is 3 mm. An electron projected parallel to the plates as shown with a speed of 2×10⁶ m^-1 moves undeflected between the plates. The magnitude and direction of the magnetic field is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The point from where a ball is projected is taken as the origin of co-ordinate system. The components of its displacement along x and y are given by x = 6t and y=8t−5t2. What is the velocity and angle of projection?

A solid sphere rolls down on an inclined plane. If inclination angle is 30∘ and friction is sufficient for rolling while not slipping, find a (accelaration) of center of sphere.

A circular coil of radius ‘r’ carries a current I. At what distance from centre on its axis the magnetic field is 127th of its value at the centre?

Please help me to convert 1kWh into J using dimensional analysis.

How to prepare rotation up to adv level how to start prep

An object having a velocity 4.0 ms is accelerated at the rate of 1.2 ms2 for 5.0 s. Find the distance travelled during the period of acceleration.

Evaporation is a __________ phenomenon whereas Boiling is a __________ process.

A vessel of volume 8×10−3m3 contains and Ideal gas at 300k and 210 K Pa the gas is allowed to leak till the pressure falls to 135 K Pa. Calculate the amount of the gas in moles leaked assuming the temperature remains constant.

identical condensers are joined in parallel and are charged to potential V . Now they are separated and joined in series. Then the total energy and potential difference of the combination will be

∫2+x+√(2x2+x3)x+√2+x dx,x&gt;0

Which of the following devices performs the same function as a voltmeter?

Given that x=2p and y=4q, then value of log2(x3y) is

A current I flows in a long thin walled cylinder of radius R. What pressure do the walls of the cylinder experience?

A mild-steel wire of length 2L and cross-sectional area A is stretched well within elastic limit horizontally between two pillars and a mass m is suspended from the midpoint of the wire as shown in figure. If strain in the wire is equal to n×x2L2. The value of n is .(Assume x&lt;&lt;L)

When a cylindrical tube is dipped vertically into a liquid, the angle of contact is 140∘. When the tube is dipped with an inclination of 40∘, the angle of contact is:

The plots of intensity versus wavelength of three black bodies at temperatures T1,T2 and T3 respectively are shown in figure. Their temperatures are such that

Two blocks, each having a mass M, rest on frictionless surfaces as shown in the figure. If the pulleys are light and frictionless, and M on the incline is allowed to move down along the incline, then the tension in the string will be

The plots for intensity versus wavelength for three black bodies at temperatures T1, T2, T3 respectively are shown in figure. Their temperatures are such that

An object is released from rest. The time it takes to fall through a distance h and the speed of the object as it falls through this distance are measured with a pendulum clock. The entire apparatus is taken on the moon and the experiment is repeated. Then?

A sample of an ideal gas occupies volume V at a pressure P and absolute temperature T. The mass of each molecule is m. Which of the following expressions gives the density of the gas?

A stone of mass 0.05 kg is thrown vertically upwards. What is the direction and magnitude of net force on the stone during its upward motion?

The moment of inertia of a body about a given axis is 1.2 kg−m2. Initially, the body is at rest. In order to produce a rotational KE of 1500 joule, an angular acceleration of 25 rad/sec2 must be applied about that axis for the duration of- (correct answer + 1, wrong answer - 0.25)

Three rings each of mass, m and radius, r are placed in a plane touching each other as shown. The radius of gyration of the system about the axis as shown in the figure is

A satellite is moving in elliptical orbit around a fixed planet. If eccentricity of ellipse is e = 0.4 then ratio of maximum speed to minimum speed of satellite is (Answer upto two digits after the decimal point.)

If the critical angle for total internal reflection from a medium to vacuum is 300 , the velocity of light in the medium is

A particle executes simple harmonic motion with a frequency f. The frequency with which its kinetic energy oscillates is

A stone of relative density K is released from rest on the surface of a lake. If various effects are ignored, the stone sinks in water with an acceleration of

A wire carrying current I has the shape as shown in the figure. Linear parts of the wire are very long and parallel to X-axis while semi-circular portion of radius R is lying in Y−Z plane. Magnetic field at point O is

An object of mass m is tied to a string of length l and a variable force F is applied on it which brings the string gradually to an angle θ with the vertical. The work done by the force F is

A frictionless cart of mass M carries two other frictionless carts having masses m1 and m2 connected by a string passing over a pulley as shown in figure. The horizontal force that must be applied on M, so that m1 and m2 do not move relative to it will be

A particle moves in space along the path z=ax3+by2, in such a way that dxdt=c=dydt where a, b and c are constants. The acceleration of the particle is:

State and Explain Gauss’ theorem.

Find the minimum coefficient of friction between the cylindrical shell and inclined plane as shown in the figure, so that the shell will perform pure rolling.

Find the reading of the spring balance considering spring, pulley and string to be massless.

Velocity of a particle travelling along a straight line represented by +ve x-axis is given by 4 0≤t≤5 v (m/s) = 2t 6≤t&lt;10 6t2 10≤t≤20 Find out the distance travelled by the particle between t=4 s to t=12 s.

At a given instant, block A is moving upwards with velocity of 5 m/s, what is velocity of block B at that instant? Assume that the strings are inextensible and pulleys are frictionless.

A particle is found to be at rest when seen from a frame S1 and moving with a constant velocity when seen from another frame S2. Mark out the possible options.

Ratio of minimum kinetic energies of two projectiles of same mass is 4:1. The ratio of the maximum height attained by them is also 4:1. The ratio of their ranges would be

Electric field lines never form closed loops as they are conservative in nature. Explain how? What is the link between being conservative and not forming closed loops?

In the circuit shown in figure switch S is thrown to position 1 at t=0. When the currect in the resistor is 1 A, it is shifted to position 2. The total heat generated in the circuit after shifting to position 2 is

A particle is projected from the ground with an initial velocity of 20 m/s at an angle of 30∘ with horizontal. The magnitude of change in velocity in a time interval from t=0 to t=0.5 s is (g=10 m/s2)

Two small balls A and B, each of mass m, are attached rigidly to the ends of a light rod of length d. The structure rotates about the perpendicular bisector of the rod at an angular speed ω. Calculate the angular momentum of the system about the axis of rotation.

A ball takes t second to fall from a height h1 and 2t seconds to fall from a height h2. Then h1h2 is:

For an adiabatic expansion of an ideal gas, the fractional change in its pressure is equal to

A laddre 5 m long is leaning against a wall. The bottom of the ladder is pulled along the ground, away from the wall, at the rate of 2 m/s. How fast is its height on the wall decreasing when the foot of the ladder is 4 m away from the wall?

Evaporation is a phenomenon whereas Boiling is a process.

∫2+x+√(2x2+x3)x+√2+x dx,x>0

A mild-steel wire of length 2L and cross-sectional area A is stretched well within elastic limit horizontally between two pillars and a mass m is suspended from the midpoint of the wire as shown in figure. If strain in the wire is equal to n×x2L2. The value of n is .(Assume x<<L)

Velocity of a particle travelling along a straight line represented by +ve x-axis is given by 4 0≤t≤5 v (m/s) = 2t 6≤t<10 6t2 10≤t≤20 Find out the distance travelled by the particle between t=4 s to t=12 s.