50278 + Interview Questions in Physics

1.	The mass of an electron is 9 x 10-31 kg. It revolves around the nucleus of an atom in a circular orbit of radius 4.5 Å, with a speed of 8 x 105 m/s. The angular momentum of electron is
Answer» The mass of an electron is 9 x 10^-31 kg. It revolves around the nucleus of an atom in a circular orbit of radius 4.5 Å, with a speed of 8 x 10⁵ m/s. The angular momentum of electron is

Discussion

2.	The color of KMnO4 is due to:
Answer» The color of KMnO₄is due to:

Discussion

3.	Perfectly reflecting mirror of mass M mounted on a spring constitutes a spring mass system of angular frequency Ω, such that 4π MΩh=1034m−3, where h is planck constant, N photons of wavelength λ=8π×10−6 m strikes the mirror simultaneously at normal incidence such that the mirror gets displaced by 1μ m. If the value of N is x×10−2, then the value of x is
Answer» Perfectly reflecting mirror of mass $M$ mounted on a spring constitutes a spring mass system of angular frequency $Ω,$ such that $\frac{4 π M Ω}{h} = 10^{34} m^{- 3},$ where $h$ is planck constant, $N$ photons of wavelength $λ = 8 π \times 10^{- 6} m$ strikes the mirror simultaneously at normal incidence such that the mirror gets displaced by $1 μ m .$ If the value of $N$ is $x \times 10^{- 2},$ then the value of $x$ is

Discussion

4.	The photo-electron liberated from the surface of lithium (ϕ=2.39 eV) by electromagnetic radiation whose electric component varies with time as E=a(1+cosωt)cosω0t where a = constant, ω=6×1014 rad/s and ω0=3.60×1015rad/s, then the maximum kinetic energy of photo-electron is (in eV)
Answer» The photo-electron liberated from the surface of lithium $(ϕ = 2.39 e V)$ by electromagnetic radiation whose electric component varies with time as $E = a (1 + cos ω t) cos ω_{0} t$ where $a$ = constant, $ω = 6 \times 10^{14} r a d / s$ and $ω_{0} = 3.60 \times 10^{15} r a d / s$ , then the maximum kinetic energy of photo-electron is (in eV)

Discussion

5.	A block of mass m is placed on another block of mass M, which itself is lying on a horizontal surface. The coefficient of friction between two blocks is μ1 and that between the block of mass M and horizontal surface μ2. What maximum horizontal force can be applied to the lower block so that the two blocks move without separation?
Answer» A block of mass m is placed on another block of mass M, which itself is lying on a horizontal surface. The coefficient of friction between two blocks is $μ_{1}$ and that between the block of mass M and horizontal surface $μ_{2}$ . What maximum horizontal force can be applied to the lower block so that the two blocks move without separation?

Discussion

6.	The temperature of an ideal gas is increased from 27∘C to 127∘C. Then, percentage increase in Vrms is
Answer» The temperature of an ideal gas is increased from $27^{\circ} C$ to $127^{\circ} C$ . Then, percentage increase in $V_{r m s}$ is

Discussion

7.	A man standing stationary with respect to a horizontal conveyer belt which is accelerating with 1 m/s2 as shown in figure. If the coefficient of static friction between man's shoes and the belt is 0.2, up to what acceleration of the belt can the man continue to be stationary relative to the belt? (Mass of the man =65 kg). Take g=10 m/s2.
Answer» A man standing stationary with respect to a horizontal conveyer belt which is accelerating with $1 {m/s}^{2}$ as shown in figure. If the coefficient of static friction between man's shoes and the belt is $0.2$ , up to what acceleration of the belt can the man continue to be stationary relative to the belt? (Mass of the man $= 65 kg$ ). Take $g = 10 {m/s}^{2}$ .

Discussion

8.	A wire is made by attaching two segments together end to end. One segment is made of aluminium and the other is steel. The effective coefficient of linear expansion of the two segment wire is 19×10−6/(∘C). The fractional length of aluminium is (linear coefficients of thermal expansion of aluminium and steel are 23×10−6/(∘C) and 12×10−6/(∘C) respectively)
Answer» A wire is made by attaching two segments together end to end. One segment is made of aluminium and the other is steel. The effective coefficient of linear expansion of the two segment wire is $19 \times 10^{- 6} / (^{\circ} C)$ . The fractional length of aluminium is (linear coefficients of thermal expansion of aluminium and steel are $23 \times 10^{- 6} / (^{\circ} C)$ and $12 \times 1 0^{- 6} / (^{\circ} C)$ respectively)

Discussion

9.	Two blocks of masses m1 and m2 are connected with a light spring of force constant k and the whole system is kept on a frictionless horizontal surface. The masses are applied forces F1 and F2 as shown in figure. At any time, the blocks have same acceleration a0 but in opposite directions. Then acceleration a0 is
Answer» Two blocks of masses $m_{1}$ and $m_{2}$ are connected with a light spring of force constant $k$ and the whole system is kept on a frictionless horizontal surface. The masses are applied forces $F_{1}$ and $F_{2}$ as shown in figure. At any time, the blocks have same acceleration $a_{0}$ but in opposite directions. Then acceleration $a_{0}$ is

Discussion

10.	In Exercises 3.13 and 3.14, we have carefully distinguished between average speed and magnitude of average velocity. No such distinction is necessary when we consider instantaneous speed and magnitude of velocity. The instantaneous speed is always equal to the magnitude of instantaneous velocity. Why?
Answer» In Exercises 3.13 and 3.14, we have carefully distinguished between average speed and magnitude of average velocity. No such distinction is necessary when we consider instantaneous speed and magnitude of velocity. The instantaneous speed is always equal to the magnitude of instantaneous velocity. Why?

Discussion

11.	A moving charge will gain kinetic energy due to the application of :- (1) Electric field (2) Magnetic field (3) Both of these (4) None of these
Answer» A moving charge will gain kinetic energy due to the application of :- (1) Electric field (2) Magnetic field (3) Both of these (4) None of these

Discussion

12.	Why activation energy should be low in order to have higher rate of reaction?
Answer» Why activation energy should be low in order to have higher rate of reaction?

Discussion

13.	A liquid is kept in a cylindrical vessel which is being rotated about a vertical axis through the centre of the circular base. If the radius of the vessel is r and angular velocity of rotation is ω , then the difference in the heights of the liquid at the centre of the vessel and the edge is
Answer» A liquid is kept in a cylindrical vessel which is being rotated about a vertical axis through the centre of the circular base. If the radius of the vessel is r and angular velocity of rotation is $ω$ , then the difference in the heights of the liquid at the centre of the vessel and the edge is

Discussion

14.	A train starts from station with an acceleration 2m/s2 for 8 s. It then runs for 12 s with the speed acquired. Finally retard at uniform rate 4m/s2 and stops. Find the total distance travelled.
Answer» A train starts from station with an acceleration 2m/s² for 8 s. It then runs for 12 s with the speed acquired. Finally retard at uniform rate 4m/s²and stops. Find the total distance travelled.

Discussion

15.	Force produces a change in the shape of the body without changing its volume, strain produced is called what the (longitudinal strain ,shearing strain, volumetric strain, normal stress? Give reason
Answer» Force produces a change in the shape of the body without changing its volume, strain produced is called what the (longitudinal strain ,shearing strain, volumetric strain, normal stress? Give reason

Discussion

16.	A body is dropped from a height H. if gravity ceases to act after the second, the time of fall of the body is?
Answer» A body is dropped from a height H. if gravity ceases to act after the second, the time of fall of the body is?

Discussion

17.	The internal resistance of dry cells is ________than the common electrolytic cells.
Answer» The internal resistance of dry cells is ________than the common electrolytic cells.

Discussion

18.	The amount of heat needed to raise the temperature of 2 moles of an ideal monoatomic gas from 273 K to 373 K, when no work is done is (R = universal gas constant)
Answer» The amount of heat needed to raise the temperature of 2 moles of an ideal monoatomic gas from $273 K$ to $373 K$ , when no work is done is ( $R$ = universal gas constant)

Discussion

19.	Consider the following statements: 1. The number of protons in the nucleus of an atom of a given element is called the atomic number of that element. 2. Mass number of an atom is defined as the sum of number of protons and neutrons present in the nucleus of an atom. 3. Atoms of an element that have the same atomic number (Z) but different mass number (A) are called isotopes. Which of the above statements is incorrectly stated?
Answer» Consider the following statements: 1. The number of protons in the nucleus of an atom of a given element is called the atomic number of that element. 2. Mass number of an atom is defined as the sum of number of protons and neutrons present in the nucleus of an atom. 3. Atoms of an element that have the same atomic number (Z) but different mass number (A) are called isotopes. Which of the above statements is incorrectly stated?

19.

Consider the following statements: 1. The number of protons in the nucleus of an atom of a given element is called the atomic number of that element. 2. Mass number of an atom is defined as the sum of number of protons and neutrons present in the nucleus of an atom. 3. Atoms of an element that have the same atomic number (Z) but different mass number (A) are called isotopes. Which of the above statements is incorrectly stated?

Answer»

Consider the following statements:

1. The number of protons in the nucleus of an atom of a given element is called the atomic number of that element.

2. Mass number of an atom is defined as the sum of number of protons and neutrons present in the nucleus of an atom.

3. Atoms of an element that have the same atomic number (Z) but different mass number (A) are called isotopes.

Which of the above statements is incorrectly stated?

Discussion

20.	1000 cc of an ideal gas at constant pressure is heated from 27∘C to 327∘C. The new volume will be
Answer» $1000 cc$ of an ideal gas at constant pressure is heated from $27^{\circ} C$ to $327^{\circ} C .$ The new volume will be

Discussion

21.	The angle between the vector 2^i+4^k and the Y- axis is
Answer» The angle between the vector $2^i + 4^k$ and the $Y$ - axis is

Discussion

22.	A body travels for 15 sec starting from rest with constant acceleration. If it travels distances s1,s2 and s3 in the first five seconds, second five seconds and next five seconds respectively, the relation between s1,s2 and s3 is
Answer» A body travels for $15 s e c$ starting from rest with constant acceleration. If it travels distances $s_{1}, s_{2}$ and $s_{3}$ in the first five seconds, second five seconds and next five seconds respectively, the relation between $s_{1}, s_{2}$ and $s_{3}$ is

Discussion

23.	An object of uniform density is allowed to float in water kept in a beaker. The object has triangular cross-section as shown in the figure. If the water pressure measured at the three points A,B and C below the object are PA,PB and PC respectively, then:
Answer» An object of uniform density is allowed to float in water kept in a beaker. The object has triangular cross-section as shown in the figure. If the water pressure measured at the three points $A, B$ and $C$ below the object are $P_{A}, P_{B}$ and $P_{C}$ respectively, then:

Discussion

24.	what we study in physics?do we study about machine in this part of science?
Answer» what we study in physics?do we study about machine in this part of science?

Discussion

25.	In your vedio on vector subtraction you said that " since magnitude can never be negative , so min magnitude one can get is 1." But you also taught about the null vector. I'm confused in this . Shouldn't the minimum magnitude be zero ( null vector)??
Answer» In your vedio on vector subtraction you said that " since magnitude can never be negative , so min magnitude one can get is 1." But you also taught about the null vector. I'm confused in this . Shouldn't the minimum magnitude be zero ( null vector)??

Discussion

26.	Two wires are made of the same material and have the same volume. The first wire has cross-sectional area A and the second wire has cross-sectional area 3A. If length of the first wire is increased by Δl on applying a force F, then how much force is needed to stretch the second wire by the same amount?
Answer» Two wires are made of the same material and have the same volume. The first wire has cross-sectional area $A$ and the second wire has cross-sectional area $3 A$ . If length of the first wire is increased by $Δ l$ on applying a force $F$ , then how much force is needed to stretch the second wire by the same amount?

Discussion

27.	Four cannon balls, '1', '2', '3' and '4' are fired from level ground. Cannonball '1' is fired at an angle of 60∘ above the horizontal and follows the path shown. Cannonballs '2' and '3' are fired at an angle of 45∘ and '4' is fired at an angle of 30∘ above the horizontal. Which cannon ball has the largest initial speed?
Answer» Four cannon balls, '1', '2', '3' and '4' are fired from level ground. Cannonball '1' is fired at an angle of $60^{\circ}$ above the horizontal and follows the path shown. Cannonballs '2' and '3' are fired at an angle of $45^{\circ}$ and '4' is fired at an angle of $30^{\circ}$ above the horizontal. Which cannon ball has the largest initial speed?

27.

Four cannon balls, '1', '2', '3' and '4' are fired from level ground. Cannonball '1' is fired at an angle of 60∘ above the horizontal and follows the path shown. Cannonballs '2' and '3' are fired at an angle of 45∘ and '4' is fired at an angle of 30∘ above the horizontal. Which cannon ball has the largest initial speed?

Answer»

Four cannon balls, '1', '2', '3' and '4' are fired from level ground. Cannonball '1' is fired at an angle of $60^{\circ}$ above the horizontal and follows the path shown.

Cannonballs '2' and '3' are fired at an angle of $45^{\circ}$ and '4' is fired at an angle of $30^{\circ}$ above the horizontal. Which cannon ball has the largest initial speed?

Discussion

28.	Suppose the pressure at the surface of mercury in a barometer tube is PA and the pressure at the surface of mercury in the cup is PB.
Answer» Suppose the pressure at the surface of mercury in a barometer tube is P_A and the pressure at the surface of mercury in the cup is P_B.

Discussion

29.	At what time t is the particle momentarily at rest.
Answer» At what time t is the particle momentarily at rest.

29.

At what time t is the particle momentarily at rest.

Answer»

At what time t is the particle momentarily at rest.

Discussion

30.	How to convert litre Atm to joules in thermodynamics?
Answer» How to convert litre Atm to joules in thermodynamics?

Discussion

31.	A particle of mass m and charge q is placed at rest in uniform electric field E and then released. The kinetic energy gained by the particle after a distance y is
Answer» A particle of mass $m$ and charge $q$ is placed at rest in uniform electric field $E$ and then released. The kinetic energy gained by the particle after a distance $y$ is

Discussion

32.	Which Gaussian surface would you prefer to choose if you had to calculate electric field due to a charge distribution such that the integration complexity is reduced?
Answer» Which Gaussian surface would you prefer to choose if you had to calculate electric field due to a charge distribution such that the integration complexity is reduced?

Discussion

33.	The displacement of a particle varies with time t as: s=αt2−βt3. Determine the time (t) at which acceleration of the particle becomes 0.
Answer» The displacement of a particle varies with time $t$ as: $s = α t^{2} - β t^{3}$ . Determine the time $(t)$ at which acceleration of the particle becomes $0$ .

Discussion

34.	The muzzle velocity of a gun is the velocity of bullet when it leaves the barrel . The muzzle velocity of one rifle with a short barrel is greater than the muzzle velocity of the another rifle that has an longer barrel . In which rifle is the acceleration of the bullet larger ? Explain your reasoning
Answer» The muzzle velocity of a gun is the velocity of bullet when it leaves the barrel . The muzzle velocity of one rifle with a short barrel is greater than the muzzle velocity of the another rifle that has an longer barrel . In which rifle is the acceleration of the bullet larger ? Explain your reasoning

Discussion

35.	A train of sound waves is propagated along an organ pipe and gets reflected from an open end. If the displacement amplitude of the waves (incident and reflected) are 0.002 cm, the frequency is 1000 Hz and wavelength is 40 cm, then the displacement amplitude of vibration at a point at distance 10 cm from the open end inside the pipe, is
Answer» A train of sound waves is propagated along an organ pipe and gets reflected from an open end. If the displacement amplitude of the waves (incident and reflected) are 0.002 cm, the frequency is 1000 Hz and wavelength is 40 cm, then the displacement amplitude of vibration at a point at distance 10 cm from the open end inside the pipe, is

Discussion

36.	Determine the Urms of O2 at 27°c? Sir the question is how can I know which value of R (gas constant) is to be used where? Because it's 1st value is of L-atm, 2nd is of J and 3rd is of cal. So how should I know which value shall be applied where?
Answer» Determine the Urms of O2 at 27°c? Sir the question is how can I know which value of R (gas constant) is to be used where? Because it's 1st value is of L-atm, 2nd is of J and 3rd is of cal. So how should I know which value shall be applied where?

Discussion

37.	In β-decay, the Q-value of the process is E. Then
Answer» In $β$ -decay, the Q-value of the process is E. Then

Discussion

38.	What is the range of all four forces of nature? (viz, gravitational force , strong neuclear , weak nuclear force, and electromagnetic force)
Answer» What is the range of all four forces of nature? (viz, gravitational force , strong neuclear , weak nuclear force, and electromagnetic force)

Discussion

39.	A solid cylinder of mass m=4 kg and radius R=10 cm has a string wrapped around it as shown in figure.The cylinder is held horizontal by fixing the two free ends of the string to the hook on the ceiling such that both the strings are exactly vertical. The cylinder is released to fall under gravity. Find the linear acceleration (a) of the cylinder.
Answer» A solid cylinder of mass $m = 4 kg$ and radius $R = 10 cm$ has a string wrapped around it as shown in figure.The cylinder is held horizontal by fixing the two free ends of the string to the hook on the ceiling such that both the strings are exactly vertical. The cylinder is released to fall under gravity. Find the linear acceleration $(a)$ of the cylinder.

Discussion

40.	The vertical extension in a light spring by a weight of 1 kg suspended from the wire is 9.8 cm. The period of oscillation.
Answer» The vertical extension in a light spring by a weight of 1 kg suspended from the wire is 9.8 cm. The period of oscillation.

40.

The vertical extension in a light spring by a weight of 1 kg suspended from the wire is 9.8 cm. The period of oscillation.

Answer»

The vertical extension in a light spring by a weight of 1 kg suspended from the wire is 9.8 cm. The period of oscillation.

Discussion

41.	What is the slope of the line passing through the points (−2,3) and (2,7)
Answer» What is the slope of the line passing through the points $(- 2, 3)$ and $(2, 7)$

Discussion

42.	A pendulum clock keeps correct time at 0o C. Its mean coefficient of linear expansions is αo C, then the loss in seconds per day by the clock if the temperature rises by to C is
Answer» A pendulum clock keeps correct time at $0^{o} C$ . Its mean coefficient of linear expansions is $\frac{α}{^{o} C}$ , then the loss in seconds per day by the clock if the temperature rises by $t^{o} C$ is

Discussion

43.	A stone is just released from the window of a train moving along a horizontal straight track. For anstationaryobserver on the ground, the stone will hit the ground following
Answer» A stone is just released from the window of a train moving along a horizontal straight track. For anstationaryobserver on the ground, the stone will hit the ground following

43.

A stone is just released from the window of a train moving along a horizontal straight track. For anstationaryobserver on the ground, the stone will hit the ground following

Answer»

A stone is just released from the window of a train moving along a horizontal straight track. For anstationaryobserver on the ground, the stone will hit the ground following

Discussion

44.	A mass M is split into two parts, m and (M-m), which are then separated by a certain distance. What ratio of mM maximizes the gravitational force between the two parts
Answer» A mass M is split into two parts, m and (M-m), which are then separated by a certain distance. What ratio of $\frac{m}{M}$ maximizes the gravitational force between the two parts

Discussion

45.	A stone is dropped into water from a bridge 44.1 m above the water. Another stone is thrown vertically downward 1 sec later. Both strike the water simultaneously. What was the initial speed of the second stone?
Answer» A stone is dropped into water from a bridge 44.1 m above the water. Another stone is thrown vertically downward 1 sec later. Both strike the water simultaneously. What was the initial speed of the second stone?

Discussion

46.	Find the angular impulse applied to the particle in the 4 sec.
Answer» Find the angular impulse applied to the particle in the 4 sec.

Discussion

47.	A human body excretes (removes by waste discharge, sweating, etc.) certain materials by a law similar to radioactivity. If technitium is injected in some form in a human body, the body excretes half the amount in 24 hours. A patient is given an injection containing 99 Tc. This isotope is radioactive with a half-life of 6 hours. The activity from the body just after the injection is 6μCi. How much time will elapse before the activity falls to 3μCi?
Answer» A human body excretes (removes by waste discharge, sweating, etc.) certain materials by a law similar to radioactivity. If technitium is injected in some form in a human body, the body excretes half the amount in 24 hours. A patient is given an injection containing $^{99}$ Tc. This isotope is radioactive with a half-life of 6 hours. The activity from the body just after the injection is $6 μ C i$ . How much time will elapse before the activity falls to $3 μ C i$ ?

Discussion

48.	A horizontal cesium plate (Φ = 1.9 eV) is moved vertically downward at a constant speed v in a room full of radiation of wavelength 250 nm and above. What should be the minimum value of v so that the vertically upward component of velocity is nonpositive for each photo electron ?
Answer» A horizontal cesium plate ( $Φ$ = 1.9 eV) is moved vertically downward at a constant speed v in a room full of radiation of wavelength 250 nm and above. What should be the minimum value of v so that the vertically upward component of velocity is nonpositive for each photo electron ?

Discussion

49.	Two blocks of masses 400 g and 200 g are connected through a light string going over a pulley which is free to rotate about its axis. The pulley has a moment of inertia 1.6 ×10−4 kg-m2 and a radius 2.0 cm. Find (a) the kinetic energy of the system as the 400 g block falls through 50 cm, (b) the speed of the blocks at this instant.
Answer» Two blocks of masses 400 g and 200 g are connected through a light string going over a pulley which is free to rotate about its axis. The pulley has a moment of inertia 1.6 $\times 10^{- 4}$ ${kg-m}^{2}$ and a radius 2.0 cm. Find (a) the kinetic energy of the system as the 400 g block falls through 50 cm, (b) the speed of the blocks at this instant.

Discussion

50.	Calculate the moment of Inertia of a solid cylinder of mass 'M' and radius R about its Axis(as shown)?
Answer» Calculate the moment of Inertia of a solid cylinder of mass ' $M$ ' and radius $R$ about its Axis(as shown)?

50.

Calculate the moment of Inertia of a solid cylinder of mass 'M' and radius R about its Axis(as shown)?

Answer»

Calculate the moment of Inertia of a solid cylinder of mass ' $M$ ' and radius $R$ about its Axis(as shown)?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The mass of an electron is 9 x 10-31 kg. It revolves around the nucleus of an atom in a circular orbit of radius 4.5 Å, with a speed of 8 x 105 m/s. The angular momentum of electron is

The color of KMnO4 is due to:

The photo-electron liberated from the surface of lithium (ϕ=2.39 eV) by electromagnetic radiation whose electric component varies with time as E=a(1+cosωt)cosω0t where a = constant, ω=6×1014 rad/s and ω0=3.60×1015rad/s, then the maximum kinetic energy of photo-electron is (in eV)

The temperature of an ideal gas is increased from 27∘C to 127∘C. Then, percentage increase in Vrms is

A moving charge will gain kinetic energy due to the application of :- (1) Electric field (2) Magnetic field (3) Both of these (4) None of these

Why activation energy should be low in order to have higher rate of reaction?

A liquid is kept in a cylindrical vessel which is being rotated about a vertical axis through the centre of the circular base. If the radius of the vessel is r and angular velocity of rotation is ω , then the difference in the heights of the liquid at the centre of the vessel and the edge is

A train starts from station with an acceleration 2m/s2 for 8 s. It then runs for 12 s with the speed acquired. Finally retard at uniform rate 4m/s2 and stops. Find the total distance travelled.

Force produces a change in the shape of the body without changing its volume, strain produced is called what the (longitudinal strain ,shearing strain, volumetric strain, normal stress? Give reason

A body is dropped from a height H. if gravity ceases to act after the second, the time of fall of the body is?

The internal resistance of dry cells is ________than the common electrolytic cells.

The amount of heat needed to raise the temperature of 2 moles of an ideal monoatomic gas from 273 K to 373 K, when no work is done is (R = universal gas constant)

1000 cc of an ideal gas at constant pressure is heated from 27∘C to 327∘C. The new volume will be

The angle between the vector 2^i+4^k and the Y- axis is

A body travels for 15 sec starting from rest with constant acceleration. If it travels distances s1,s2 and s3 in the first five seconds, second five seconds and next five seconds respectively, the relation between s1,s2 and s3 is

An object of uniform density is allowed to float in water kept in a beaker. The object has triangular cross-section as shown in the figure. If the water pressure measured at the three points A,B and C below the object are PA,PB and PC respectively, then:

what we study in physics?do we study about machine in this part of science?

In your vedio on vector subtraction you said that " since magnitude can never be negative , so min magnitude one can get is 1." But you also taught about the null vector. I'm confused in this . Shouldn't the minimum magnitude be zero ( null vector)??

Suppose the pressure at the surface of mercury in a barometer tube is PA and the pressure at the surface of mercury in the cup is PB.

At what time t is the particle momentarily at rest.

How to convert litre Atm to joules in thermodynamics?

A particle of mass m and charge q is placed at rest in uniform electric field E and then released. The kinetic energy gained by the particle after a distance y is

Which Gaussian surface would you prefer to choose if you had to calculate electric field due to a charge distribution such that the integration complexity is reduced?

The displacement of a particle varies with time t as: s=αt2−βt3. Determine the time (t) at which acceleration of the particle becomes 0.

Determine the Urms of O2 at 27°c? Sir the question is how can I know which value of R (gas constant) is to be used where? Because it's 1st value is of L-atm, 2nd is of J and 3rd is of cal. So how should I know which value shall be applied where?

In β-decay, the Q-value of the process is E. Then

What is the range of all four forces of nature? (viz, gravitational force , strong neuclear , weak nuclear force, and electromagnetic force)

The vertical extension in a light spring by a weight of 1 kg suspended from the wire is 9.8 cm. The period of oscillation.

What is the slope of the line passing through the points (−2,3) and (2,7)

A pendulum clock keeps correct time at 0o C. Its mean coefficient of linear expansions is αo C, then the loss in seconds per day by the clock if the temperature rises by to C is

A stone is just released from the window of a train moving along a horizontal straight track. For anstationaryobserver on the ground, the stone will hit the ground following

A mass M is split into two parts, m and (M-m), which are then separated by a certain distance. What ratio of mM maximizes the gravitational force between the two parts

A stone is dropped into water from a bridge 44.1 m above the water. Another stone is thrown vertically downward 1 sec later. Both strike the water simultaneously. What was the initial speed of the second stone?

Find the angular impulse applied to the particle in the 4 sec.

A horizontal cesium plate (Φ = 1.9 eV) is moved vertically downward at a constant speed v in a room full of radiation of wavelength 250 nm and above. What should be the minimum value of v so that the vertically upward component of velocity is nonpositive for each photo electron ?

Calculate the moment of Inertia of a solid cylinder of mass 'M' and radius R about its Axis(as shown)?