50278 + Interview Questions in Physics

1.	A single slit of width 0.20 mm is illuminated with light of wavelength 500 nm. The observing screen is placed 80 cm from the slit. The width of the central bright fringe will be [AMU (Med.) 2002]
Answer» A single slit of width 0.20 mm is illuminated with light of wavelength 500 nm. The observing screen is placed 80 cm from the slit. The width of the central bright fringe will be [AMU (Med.) 2002]

1.

A single slit of width 0.20 mm is illuminated with light of wavelength 500 nm. The observing screen is placed 80 cm from the slit. The width of the central bright fringe will be [AMU (Med.) 2002]

Answer»

A single slit of width 0.20 mm is illuminated with light of wavelength 500 nm. The observing screen is placed 80 cm from the slit. The width of the central bright fringe will be

[AMU (Med.) 2002]

Discussion

2.	Two charges 4C and -2C are placed at a distance of 200 cm apart. Which of these points have zero electric potential?
Answer» Two charges 4C and -2C are placed at a distance of 200 cm apart. Which of these points have zero electric potential?

Discussion

3.	Q. The distance of Venus from the sun isi0.72 AU Find the orbital period of venus.
Answer» Q. The distance of Venus from the sun isi0.72 AU Find the orbital period of venus.

3.

Q. The distance of Venus from the sun isi0.72 AU Find the orbital period of venus.

Answer»

Q. The distance of Venus from the sun isi0.72 AU

Find the orbital period of venus.

Discussion

4.	One end of a slack wire (Young’s modulus Y, length L and cross-sectional area A) is clamped to a rigid wall and the other end to a block (mass m) which rests on a smooth horizontal plane. The block is set in motion with a speed v. What is the maximum distance the block will travel after the wire becomes taut?
Answer» One end of a slack wire (Young’s modulus Y, length L and cross-sectional area A) is clamped to a rigid wall and the other end to a block (mass m) which rests on a smooth horizontal plane. The block is set in motion with a speed v. What is the maximum distance the block will travel after the wire becomes taut?

Discussion

5.	The P−V diagram of a system undergoing thermodynamic transformation is shown in figure. The work done by the system and heat given to the system in going from A→B→C is 30 J and 40 J respectively. The change in internal energy between A and C is
Answer» The $P - V$ diagram of a system undergoing thermodynamic transformation is shown in figure. The work done by the system and heat given to the system in going from $A \to B \to C$ is $30 J$ and $40 J$ respectively. The change in internal energy between $A$ and $C$ is

Discussion

6.	Three identical spheres each of mass 1 kg are kept as shown in the figure. They are kept in such a way that they are touching each other with their respective centres on a straight line . If their centres are marked P, Q, R respectively, then the distance of the centre of mass of the system from P is:
Answer» Three identical spheres each of mass $1 kg$ are kept as shown in the figure. They are kept in such a way that they are touching each other with their respective centres on a straight line . If their centres are marked $P, Q, R$ respectively, then the distance of the centre of mass of the system from $P$ is:

Discussion

7.	Three blocks of mass 1kg, 2kg and 3kg with coefficient of friction between the surfaces are as shown. The lock 2kg is connected to the spring. The maximum deflection of spring, for which no slipping occurs between blocks is
Answer» Three blocks of mass 1kg, 2kg and 3kg with coefficient of friction between the surfaces are as shown. The lock 2kg is connected to the spring. The maximum deflection of spring, for which no slipping occurs between blocks is

Discussion

8.	A student obtained a sharp image of a lighted candle on the screen using a convex lens. Now he wants to focus a distant lamp on the screen. In which direction should the lens be moved for this purpose with respect to the screen, to get a sharp image on the screen?
Answer» A student obtained a sharp image of a lighted candle on the screen using a convex lens. Now he wants to focus a distant lamp on the screen. In which direction should the lens be moved for this purpose with respect to the screen, to get a sharp image on the screen?

Discussion

9.	A monochromatic beam of light is incident at 60∘ on one face of an equilateral prism of refractive index n and emerges from the opposite face making an angle θ(n) with the normal (see the figure). For n=√3 the value of θ is 60∘ and dθdn=m. The value of m is .
Answer» A monochromatic beam of light is incident at $60^{\circ}$ on one face of an equilateral prism of refractive index n and emerges from the opposite face making an angle $θ (n)$ with the normal (see the figure). For $n = \sqrt{3}$ the value of $θ$ is $60^{\circ}$ and $\frac{d θ}{d n} = m$ . The value of m is .

Discussion

10.	Statement : Shyam is supposed to give 50 KJ of energy (q) to a particular system, then it doesn't matter how he gives it (electrically , or by heating or in anyway) . Conclusion: q is not a path function . Whether the given statement and Conclusion are correct or wrong ? Explain .
Answer» Statement : Shyam is supposed to give 50 KJ of energy (q) to a particular system, then it doesn't matter how he gives it (electrically , or by heating or in anyway) . Conclusion: q is not a path function . Whether the given statement and Conclusion are correct or wrong ? Explain .

10.

Statement : Shyam is supposed to give 50 KJ of energy (q) to a particular system, then it doesn't matter how he gives it (electrically , or by heating or in anyway) . Conclusion: q is not a path function . Whether the given statement and Conclusion are correct or wrong ? Explain .

Answer»

Statement : Shyam is supposed to give 50 KJ of energy (q) to a particular system, then it doesn't matter how he gives it (electrically , or by heating or in anyway) .

Conclusion: q is not a path function .

Whether the given statement and Conclusion are correct or wrong ?

Explain .

Discussion

11.	Explain circular motion of car on a level road for 5 marks
Answer» Explain circular motion of car on a level road for 5 marks

Discussion

12.	A 3000 kg rocket has to be fired vertically. Calculate the rate of ejection of gas required at an exhaust speed 450 m/s in order to provide necessary support to the weight of the rocket. (Take g=10 m/s2)
Answer» A $3000 kg$ rocket has to be fired vertically. Calculate the rate of ejection of gas required at an exhaust speed $450 m/s$ in order to provide necessary support to the weight of the rocket. (Take $g = 10 m / s^{2}$ )

Discussion

13.	The masses of the wires of copper are in the ratio 1:3:5 and their lengths are in the ratio 5:3:1. The ratio of their electrical resistances is:
Answer» The masses of the wires of copper are in the ratio $1 : 3 : 5$ and their lengths are in the ratio $5 : 3 : 1$ . The ratio of their electrical resistances is:

Discussion

14.	A garden is 90 m long and 75 m broad.A path 5m wide is to be built outside and around it. Find the area of path.Also find area of garden in hectares
Answer» A garden is 90 m long and 75 m broad.A path 5m wide is to be built outside and around it. Find the area of path.Also find area of garden in hectares

Discussion

15.	In the arrangement shown in the figure, if v1 and v2 are instantaneous velocities of masses M1 and M2 respectively, and angle ACB=2θ at the instant, then
Answer» In the arrangement shown in the figure, if $v_{1}$ and $v_{2}$ are instantaneous velocities of masses $M_{1}$ and $M_{2}$ respectively, and angle $A C B = 2 θ$ at the instant, then

Discussion

16.	One mole of an ideal gas at temperature T1 expands according to the law (PV)= constant. Find the work done when the final temperature becomes T2.
Answer» One mole of an ideal gas at temperature $T_{1}$ expands according to the law $(\frac{P}{V}) = constant$ . Find the work done when the final temperature becomes $T_{2}$ .

Discussion

17.	Calculate the area of the parallelogram when adjacent sides are given by the vectors →A = ^i + 2^j + 3^k and →B = 2^i − 3^j + ^k
Answer» Calculate the area of the parallelogram when adjacent sides are given by the vectors $\to A$ = $^i + 2^j + 3^k$ and $\to B$ = $2^i - 3^j +^k$

Discussion

18.	A metal has a work function of 2.5×10−19 J.The threshold frequency beyond which photo electrons will come out is.
Answer» A metal has a work function of $2.5 \times 10^{- 19} J .$ The threshold frequency beyond which photo electrons will come out is.

Discussion

19.	The acceleration of a body due to the attraction of the earth (radius R) at a distance 2R from the surface of the earth is (g = acceleration due to gravity at the surface of the earth)
Answer» The acceleration of a body due to the attraction of the earth (radius R) at a distance 2R from the surface of the earth is (g = acceleration due to gravity at the surface of the earth)

Discussion

20.	A particle starts from rest and has an acceleration of 2 m/s2 for 10 sec. After that, it travels for 30 sec with constant speed and then undergoes a retardation of 4 m/s2 and comes back to rest. The total distance covered by the particle is
Answer» A particle starts from rest and has an acceleration of $2 {m/s}^{2}$ for 10 sec. After that, it travels for 30 sec with constant speed and then undergoes a retardation of $4 {m/s}^{2}$ and comes back to rest. The total distance covered by the particle is

Discussion

21.	A point sized sphere of mass m is suspended from a point using a string of length l. It is then pulledto a side till the string is horizontal and released.as the mass passes through the portion where the string is vertical,magnitude of its angular momentum is
Answer» A point sized sphere of mass m is suspended from a point using a string of length l. It is then pulledto a side till the string is horizontal and released.as the mass passes through the portion where the string is vertical,magnitude of its angular momentum is

Discussion

22.	What are mole and candela
Answer» What are mole and candela

Discussion

23.	A particle of mass m is executing oscillations about the origin on the x-axis. Its potential energy is V(x)=k\|x\|3, where k is a positive constant. If the amplitude of oscillation is a, then its time period T is
Answer» A particle of mass m is executing oscillations about the origin on the x-axis. Its potential energy is $V (x) = k \| x \|^{3}$ , where k is a positive constant. If the amplitude of oscillation is a, then its time period T is

Discussion

24.	In photoelectric experiment, since electrons are accelerated while moving from cathode to anode, so which type of em wave they will emit?
Answer» In photoelectric experiment, since electrons are accelerated while moving from cathode to anode, so which type of em wave they will emit?

Discussion

25.	A magician during a show makes a glass lens with n = 1.47 which disappear in a trough of liquid. What is the refractive index of the liquid?
Answer» A magician during a show makes a glass lens with n = 1.47 which disappear in a trough of liquid. What is the refractive index of the liquid?

Discussion

26.	The relation between time and distance is t=αx2+βx where α and β are constants. The retardation is
Answer» The relation between time and distance is $t = α x^{2} + β x$ where $α$ and $β$ are constants. The retardation is

26.

The relation between time and distance is t=αx2+βx where α and β are constants. The retardation is

Answer»

The relation between time and distance is $t = α x^{2} + β x$ where $α$ and $β$ are constants. The retardation is

Discussion

27.	A boy takes 90 second to walk up a stalled escalator. However, if the escalator is moving and he stands on the escalator, he is carried up in one minute. how much time the boy would take to walk up the moving escalator?
Answer» A boy takes $90$ second to walk up a stalled escalator. However, if the escalator is moving and he stands on the escalator, he is carried up in one minute. how much time the boy would take to walk up the moving escalator?

Discussion

28.	A particle loses 25% of its kinetic energy during head on collision with another identical particle initially at rest. The coefficient of restitution will be
Answer» A particle loses $25 %$ of its kinetic energy during head on collision with another identical particle initially at rest. The coefficient of restitution will be

Discussion

29.	On the superposition of the two waves represented by equation, y1=Asin(ωt−kx) y2=Acos(ωt−kx+π6) The resultant angular frequency of the oscillation will be
Answer» On the superposition of the two waves represented by equation, $y_{1} = A sin (ω t - k x)$ $y_{2} = A cos (ω t - k x + \frac{π}{6})$ The resultant angular frequency of the oscillation will be

Discussion

30.	If the electron has same momentum as that of a photon of wavelength 5200∘A, then the velocity of electron in m /sec is given by
Answer» If the electron has same momentum as that of a photon of wavelength $5200 \circ A$ , then the velocity of electron in m /sec is given by

Discussion

31.	10g of a Gas at 1atm pressure is cooled from 273o C to 273K. Keeping its volume constant. The pressure of the Gas will
Answer» 10g of a Gas at 1atm pressure is cooled from $273^{o} C$ to 273K. Keeping its volume constant. The pressure of the Gas will

Discussion

32.	A steel rod is clamped at its two ends and rests on a fixed horizontal base. The rod is unstrained at 20∘ C. Find the longitudinal strain developed in the rod if the temperature rises to 50∘ C. Coefficient of linear expansion of steel =1.2×10−5 ∘C−1.
Answer» A steel rod is clamped at its two ends and rests on a fixed horizontal base. The rod is unstrained at $20^{\circ} C$ . Find the longitudinal strain developed in the rod if the temperature rises to $50^{\circ} C$ . Coefficient of linear expansion of steel $= 1.2 \times 10^{- 5}^{\circ} C^{- 1}$ .

Discussion

33.	The de-Broglie wavelength of a neutron at 27∘C is λ. What will be its wavelength at 927∘C
Answer» The de-Broglie wavelength of a neutron at $27^{\circ} C$ is $λ$ . What will be its wavelength at $927^{\circ} C$

Discussion

34.	A current flows in a wire of circular cross-section with the free electrons travelling with a mean drift velocity v. If an equal current flows in a wire of twice the radius, then the new mean drift velocity is
Answer» A current flows in a wire of circular cross-section with the free electrons travelling with a mean drift velocity v. If an equal current flows in a wire of twice the radius, then the new mean drift velocity is

Discussion

35.	Why do we apply sign convention twice in lens, one time in the formula itself and also in the problems?Clear explanation required...
Answer» Why do we apply sign convention twice in lens, one time in the formula itself and also in the problems?Clear explanation required...

Discussion

36.	The ratio of diameters of two wires of same material is n:1. The length of wires are 4 m each. On applying the same load, the ratio of the increase in the length of thin wire to the thick wire will be
Answer» The ratio of diameters of two wires of same material is $n : 1$ . The length of wires are 4 m each. On applying the same load, the ratio of the increase in the length of thin wire to the thick wire will be

Discussion

37.	A block is placed on a rough horizontal plane. A time dependent horizontal force F=kt acts on the block. Here k is a positive constant. Acceleration-time graph of the block is
Answer» A block is placed on a rough horizontal plane. A time dependent horizontal force $F = k t$ acts on the block. Here $k$ is a positive constant. Acceleration-time graph of the block is

Discussion

38.	There are four rods AB,BC,CD & DA of same length L , but different linear mass densities ρ,2ρ,3ρ and 4ρ respectively. These are joined to form a square frame as shown in figure. Find the co-ordinates of the centre of mass of the structure.
Answer» There are four rods $A B, B C, C D$ & $D A$ of same length $L$ , but different linear mass densities $ρ, 2 ρ, 3 ρ$ and $4 ρ$ respectively. These are joined to form a square frame as shown in figure. Find the co-ordinates of the centre of mass of the structure.

Discussion

39.	Which of the following is the correct expression for heisenberg's uncertainity principle:
Answer» Which of the following is the correct expression for heisenberg's uncertainity principle:

Discussion

40.	Which class of lever can be a force multiplier or a speed multiplier? Give examples.
Answer» Which class of lever can be a force multiplier or a speed multiplier? Give examples.

Discussion

41.	If a colour – blind woman marries a normal visioned man, their sons will be
Answer» If a colour – blind woman marries a normal visioned man, their sons will be

Discussion

42.	For a particle executing simple harmonic motion, which of the following statements is not correct [MP PMT 1997; AIIMS 1999; Kerala PMT 2005]
Answer» For a particle executing simple harmonic motion, which of the following statements is not correct [MP PMT 1997; AIIMS 1999; Kerala PMT 2005]

42.

For a particle executing simple harmonic motion, which of the following statements is not correct [MP PMT 1997; AIIMS 1999; Kerala PMT 2005]

Answer»

For a particle executing simple harmonic motion, which of the following statements is not correct

[MP PMT 1997; AIIMS 1999; Kerala PMT 2005]

Discussion

43.	Draw a block diagram of a generalized communication system. Write the functions of each of the following: (a) Transmitter (b) Channel (c) Receiver
Answer» Draw a block diagram of a generalized communication system. Write the functions of each of the following: (a) Transmitter (b) Channel (c) Receiver

Discussion

44.	A boy standing on a long railroad car throws a ball straight upwards. The car is moving on the horizontal road with an acceleration of 1 m/s2 and the projection speed in the vertical direction in 9.8 m/s. How far the ball will fall behind the boy? (Take g=9.8 m/s2)
Answer» A boy standing on a long railroad car throws a ball straight upwards. The car is moving on the horizontal road with an acceleration of $1 m / s^{2}$ and the projection speed in the vertical direction in $9.8 m / s$ . How far the ball will fall behind the boy? $(Take g = 9.8 m / s^{2})$

Discussion

45.	For the circuit arrangement shown in figure, the charge on the capacitor in the steady state condition is
Answer» For the circuit arrangement shown in figure, the charge on the capacitor in the steady state condition is

Discussion

46.	Rain is falling vertically with a speed of 12√3 m/s. A woman rides a bicycle with a speed of 12 m/s from East to West direction. What is the velocity of rain relative to the woman? (Take east and vertically upward as positive x-axis and positive y-axis respectively.)
Answer» Rain is falling vertically with a speed of $12 \sqrt{3} m / s$ . A woman rides a bicycle with a speed of $12 m / s$ from East to West direction. What is the velocity of rain relative to the woman? (Take east and vertically upward as positive x-axis and positive y-axis respectively.)

Discussion

47.	Figure (10 - E15) shows a small spherical ball of mass m rolling down the loop track. The ball is released on the linear portion at a vertical height H from the lowest point. The circular part shown has a radius R. (a) Find the kinetic energy of the ball when it is at a point A where the radius makes an angle θ with the horizontal. (b) Find the radial and the tangential accelerations of the centre when the ball is at A.
Answer» Figure (10 - E15) shows a small spherical ball of mass m rolling down the loop track. The ball is released on the linear portion at a vertical height H from the lowest point. The circular part shown has a radius R. (a) Find the kinetic energy of the ball when it is at a point A where the radius makes an angle $θ$ with the horizontal. (b) Find the radial and the tangential accelerations of the centre when the ball is at A.

47.

Figure (10 - E15) shows a small spherical ball of mass m rolling down the loop track. The ball is released on the linear portion at a vertical height H from the lowest point. The circular part shown has a radius R. (a) Find the kinetic energy of the ball when it is at a point A where the radius makes an angle θ with the horizontal. (b) Find the radial and the tangential accelerations of the centre when the ball is at A.

Answer»

Figure (10 - E15) shows a small spherical ball of mass m rolling down the loop track. The ball is released on the linear portion at a vertical height H from the lowest point. The circular part shown has a radius R. (a) Find the kinetic energy of the ball when it is at a point A where the radius makes an angle $θ$ with the horizontal. (b) Find the radial and the tangential accelerations of the centre when the ball is at A.

Discussion

48.	Two particles A and B are moving with uniform velocity as shown in the figure given below at t = 0. What is the shortest distance between two particles?
Answer» Two particles A and B are moving with uniform velocity as shown in the figure given below at t = 0. What is the shortest distance between two particles?

48.

Two particles A and B are moving with uniform velocity as shown in the figure given below at t = 0. What is the shortest distance between two particles?

Answer»

Two particles A and B are moving with uniform velocity as shown in the figure given below at t = 0.

What is the shortest distance between two particles?

Discussion

49.	Two tuning forks A and B each of natural frequency 85 Hz move with velocity 10 m/s relative to stationary observer 'O'. Fork A moves away from the observer while the fork B moves towards him as shown in the figure. A wind with a speed 10 m/s is blowing in the direction of motion of fork A. Find the beat frequency measured by the observer in Hz. [Take speed of sound in air as 340m/s]
Answer» Two tuning forks A and B each of natural frequency $85 H z$ move with velocity $10 m/s$ relative to stationary observer 'O'. Fork A moves away from the observer while the fork B moves towards him as shown in the figure. A wind with a speed $10 m/s$ is blowing in the direction of motion of fork A. Find the beat frequency measured by the observer in Hz. [Take speed of sound in air as $340 m/s]$

Discussion

50.	On a two-lane road, car A is travelling with a speed of 36 km/hr. Two cars, B and C approach car A in opposite directions with a speed of 54 km/h. At a certain instant, when the distance AB is equal to AC, both 1 km, B decided to overtake A before C does. What minimum acceleration of car B is required to avoid an accident.
Answer» On a two-lane road, car A is travelling with a speed of 36 km/hr. Two cars, B and C approach car A in opposite directions with a speed of 54 km/h. At a certain instant, when the distance AB is equal to AC, both 1 km, B decided to overtake A before C does. What minimum acceleration of car B is required to avoid an accident.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A single slit of width 0.20 mm is illuminated with light of wavelength 500 nm. The observing screen is placed 80 cm from the slit. The width of the central bright fringe will be [AMU (Med.) 2002]

Two charges 4C and -2C are placed at a distance of 200 cm apart. Which of these points have zero electric potential?

Q. The distance of Venus from the sun isi0.72 AU Find the orbital period of venus.

The P−V diagram of a system undergoing thermodynamic transformation is shown in figure. The work done by the system and heat given to the system in going from A→B→C is 30 J and 40 J respectively. The change in internal energy between A and C is

Three blocks of mass 1kg, 2kg and 3kg with coefficient of friction between the surfaces are as shown. The lock 2kg is connected to the spring. The maximum deflection of spring, for which no slipping occurs between blocks is

A student obtained a sharp image of a lighted candle on the screen using a convex lens. Now he wants to focus a distant lamp on the screen. In which direction should the lens be moved for this purpose with respect to the screen, to get a sharp image on the screen?

A monochromatic beam of light is incident at 60∘ on one face of an equilateral prism of refractive index n and emerges from the opposite face making an angle θ(n) with the normal (see the figure). For n=√3 the value of θ is 60∘ and dθdn=m. The value of m is .

Statement : Shyam is supposed to give 50 KJ of energy (q) to a particular system, then it doesn't​ matter how he gives it (electrically , or by heating or in anyway) . Conclusion: q is not a path function . Whether the given statement and Conclusion are correct or wrong ? Explain .

Explain circular motion of car on a level road for 5 marks

A 3000 kg rocket has to be fired vertically. Calculate the rate of ejection of gas required at an exhaust speed 450 m/s in order to provide necessary support to the weight of the rocket. (Take g=10 m/s2)

The masses of the wires of copper are in the ratio 1:3:5 and their lengths are in the ratio 5:3:1. The ratio of their electrical resistances is:

A garden is 90 m long and 75 m broad.A path 5m wide is to be built outside and around it. Find the area of path.Also find area of garden in hectares

In the arrangement shown in the figure, if v1 and v2 are instantaneous velocities of masses M1 and M2 respectively, and angle ACB=2θ at the instant, then

One mole of an ideal gas at temperature T1 expands according to the law (PV)= constant. Find the work done when the final temperature becomes T2.

Calculate the area of the parallelogram when adjacent sides are given by the vectors →A = ^i + 2^j + 3^k and →B = 2^i − 3^j + ^k

A metal has a work function of 2.5×10−19 J.The threshold frequency beyond which photo electrons will come out is.

The acceleration of a body due to the attraction of the earth (radius R) at a distance 2R from the surface of the earth is (g = acceleration due to gravity at the surface of the earth)

A particle starts from rest and has an acceleration of 2 m/s2 for 10 sec. After that, it travels for 30 sec with constant speed and then undergoes a retardation of 4 m/s2 and comes back to rest. The total distance covered by the particle is

A point sized sphere of mass m is suspended from a point using a string of length l. It is then pulledto a side till the string is horizontal and released.as the mass passes through the portion where the string is vertical,magnitude of its angular momentum is

What are mole and candela

A particle of mass m is executing oscillations about the origin on the x-axis. Its potential energy is V(x)=k|x|3, where k is a positive constant. If the amplitude of oscillation is a, then its time period T is

In photoelectric experiment, since electrons are accelerated while moving from cathode to anode, so which type of em wave they will emit?

A magician during a show makes a glass lens with n = 1.47 which disappear in a trough of liquid. What is the refractive index of the liquid?

The relation between time and distance is t=αx2+βx where α and β are constants. The retardation is

A boy takes 90 second to walk up a stalled escalator. However, if the escalator is moving and he stands on the escalator, he is carried up in one minute. how much time the boy would take to walk up the moving escalator?

A particle loses 25% of its kinetic energy during head on collision with another identical particle initially at rest. The coefficient of restitution will be

On the superposition of the two waves represented by equation, y1=Asin(ωt−kx) y2=Acos(ωt−kx+π6) The resultant angular frequency of the oscillation will be

If the electron has same momentum as that of a photon of wavelength 5200∘A, then the velocity of electron in m /sec is given by

10g of a Gas at 1atm pressure is cooled from 273o C to 273K. Keeping its volume constant. The pressure of the Gas will

A steel rod is clamped at its two ends and rests on a fixed horizontal base. The rod is unstrained at 20∘ C. Find the longitudinal strain developed in the rod if the temperature rises to 50∘ C. Coefficient of linear expansion of steel =1.2×10−5 ∘C−1.

The de-Broglie wavelength of a neutron at 27∘C is λ. What will be its wavelength at 927∘C

A current flows in a wire of circular cross-section with the free electrons travelling with a mean drift velocity v. If an equal current flows in a wire of twice the radius, then the new mean drift velocity is

Why do we apply sign convention twice in lens, one time in the formula itself and also in the problems?Clear explanation required...

The ratio of diameters of two wires of same material is n:1. The length of wires are 4 m each. On applying the same load, the ratio of the increase in the length of thin wire to the thick wire will be

A block is placed on a rough horizontal plane. A time dependent horizontal force F=kt acts on the block. Here k is a positive constant. Acceleration-time graph of the block is

There are four rods AB,BC,CD &amp; DA of same length L , but different linear mass densities ρ,2ρ,3ρ and 4ρ respectively. These are joined to form a square frame as shown in figure. Find the co-ordinates of the centre of mass of the structure.

Which of the following is the correct expression for heisenberg's uncertainity principle:

Which class of lever can be a force multiplier or a speed multiplier? Give examples.

If a colour – blind woman marries a normal visioned man, their sons will be

For a particle executing simple harmonic motion, which of the following statements is not correct [MP PMT 1997; AIIMS 1999; Kerala PMT 2005]

Draw a block diagram of a generalized communication system. Write the functions of each of the following: (a) Transmitter (b) Channel (c) Receiver

A boy standing on a long railroad car throws a ball straight upwards. The car is moving on the horizontal road with an acceleration of 1 m/s2 and the projection speed in the vertical direction in 9.8 m/s. How far the ball will fall behind the boy? (Take g=9.8 m/s2)

For the circuit arrangement shown in figure, the charge on the capacitor in the steady state condition is

Rain is falling vertically with a speed of 12√3 m/s. A woman rides a bicycle with a speed of 12 m/s from East to West direction. What is the velocity of rain relative to the woman? (Take east and vertically upward as positive x-axis and positive y-axis respectively.)

Two particles A and B are moving with uniform velocity as shown in the figure given below at t = 0. What is the shortest distance between two particles?

Statement : Shyam is supposed to give 50 KJ of energy (q) to a particular system, then it doesn't matter how he gives it (electrically , or by heating or in anyway) . Conclusion: q is not a path function . Whether the given statement and Conclusion are correct or wrong ? Explain .

There are four rods AB,BC,CD & DA of same length L , but different linear mass densities ρ,2ρ,3ρ and 4ρ respectively. These are joined to form a square frame as shown in figure. Find the co-ordinates of the centre of mass of the structure.