50278 + Interview Questions in Physics

1.	In a double slit pattern (λ=6000 A∘), the first order and tenth order maxima fall at 13.00 mm and 15.25 mm from a particular reference point. If λ is changed to 5500 A∘, find the position of tenth order fringe (in mm) (answer the nearest integer), other arrangement remaining the same.
Answer» In a double slit pattern $(λ = 6000 A^{\circ})$ , the first order and tenth order maxima fall at $13.00 mm$ and $15.25 mm$ from a particular reference point. If $λ$ is changed to $5500 A^{\circ}$ , find the position of tenth order fringe (in mm) (answer the nearest integer), other arrangement remaining the same.

Discussion

2.	A galvanometer can be converted to a voltmeter of full-scale deflection V0 by connecting a series resistance R1 and can be converted to an ammeter of full -scale deflection I0 by connecting a shunt resistance R2. What is the current flowing through the galvanometer at its full-scale deflection?
Answer» A galvanometer can be converted to a voltmeter of full-scale deflection $V_{0}$ by connecting a series resistance $R_{1}$ and can be converted to an ammeter of full -scale deflection $I_{0}$ by connecting a shunt resistance $R_{2}$ . What is the current flowing through the galvanometer at its full-scale deflection?

Discussion

3.	The angle made by vector 3^i+3^k with x-axis & y-axis respectively are
Answer» The angle made by vector $3^i + 3^k$ with x-axis & y-axis respectively are

Discussion

4.	The velocity of water wave v, may depend on their wavelength λ, the density of water ρ and the acceleration due to gravity g. The method of dimensions gives the relation between these quantities as: [where K is a dimensionless constant]
Answer» The velocity of water wave v, may depend on their wavelength $λ$ , the density of water $ρ$ and the acceleration due to gravity g. The method of dimensions gives the relation between these quantities as: [where K is a dimensionless constant]

Discussion

5.	In figure, infinite conducting rings each having current i in the direction shown are placed concentrically in the same plane as shown in the figure. The radius of rings are r,2r,22r,23r....infinity). The magnetic field at the center of rings will be
Answer» In figure, infinite conducting rings each having current i in the direction shown are placed concentrically in the same plane as shown in the figure. The radius of rings are $r, 2 r, 2^{2} r, 2^{3} r . . . . i n f i n i t y$ ). The magnetic field at the center of rings will be

Discussion

6.	An insulated container containing n moles of monoatomic gas of molar mass m is moving with a velocity v0. If the container is suddenly stopped, then the change in temperature is
Answer» An insulated container containing $n$ moles of monoatomic gas of molar mass $m$ is moving with a velocity $v_{0}$ . If the container is suddenly stopped, then the change in temperature is

Discussion

7.	When two displacements represented by y1=a sin (t) and y2=b cos(ωt) are superimposed the motion is :
Answer» When two displacements represented by $y_{1} = a s i n (t)$ and $y_{2} = b c o s (ω t)$ are superimposed the motion is :

Discussion

8.	Light of wavelength 6000∘A is incident normally on a single slit of width 24×10−5cm. Find out the angular position of second minimum from central maxima?
Answer» Light of wavelength $6000 \circ A$ is incident normally on a single slit of width $24 \times 10^{- 5} c m$ . Find out the angular position of second minimum from central maxima?

Discussion

9.	Hysteresis loops for two magnetic materials A and B are given below:
Answer» Hysteresis loops for two magnetic materials A and B are given below:

9.

Hysteresis loops for two magnetic materials A and B are given below:

Answer»

Hysteresis loops for two magnetic materials A and B are given below:

Discussion

10.	If two waves of same frequency and amplitude respectively on superposition produce a resultant disturbance of same amplitude the waves differ in phase by
Answer» If two waves of same frequency and amplitude respectively on superposition produce a resultant disturbance of same amplitude the waves differ in phase by

Discussion

11.	The initial conditions of a particle executing SHM are as shown in the figure. Find the phase constant ϕ of the particle. Given: Range of ϕ is [0,2π]
Answer» The initial conditions of a particle executing SHM are as shown in the figure. Find the phase constant $ϕ$ of the particle. Given: Range of $ϕ$ is $[0, 2 π$ ]

Discussion

12.	A closed tube is filled with liquid ρ=800 kg/m3. It is rotating about an axis shown in figure with an angular velocity ω=4 rad/sec and length of the tube is 9 m. Find the pressure difference between the ends of the tube.
Answer» A closed tube is filled with liquid $ρ = 800 {kg/m}^{3}$ . It is rotating about an axis shown in figure with an angular velocity $ω = 4 rad/sec$ and length of the tube is $9 m$ . Find the pressure difference between the ends of the tube.

Discussion

13.	Speed is a _____ quantity but velocity is a _________ quantity.
Answer» Speed is a _____ quantity but velocity is a _________ quantity.

Discussion

14.	As shown in figure, a man of mass M is standing on a platform and holding an inextensible massless string which passes over a system of ideal pulleys. Another body of mass m is hanging as shown in figure. Find the force exerted by the platform on man if M=50 kg,m=10 kg, Take g=10 m/s2.
Answer» As shown in figure, a man of mass $M$ is standing on a platform and holding an inextensible massless string which passes over a system of ideal pulleys. Another body of mass $m$ is hanging as shown in figure. Find the force exerted by the platform on man if $M = 50 kg, m = 10 kg$ , Take $g = 10 {m/s}^{2}$ .

Discussion

15.	A body thrown vertically up with a finite speed is caught back after 4 sec. The speed of the body with which it is thrown up is (Take g=10 m/s2)
Answer» A body thrown vertically up with a finite speed is caught back after $4 sec$ . The speed of the body with which it is thrown up is (Take $g = 10 {m/s}^{2}$ )

Discussion

16.

In a thermodynamic process on an ideal monatomic gas, the infinitesimal heat absorbed by the gas is given by TΔX, where T is temperature of the system and ΔX is the infinitesimal change in a thermodynamic quantity X of the system. For a mole of monatomic ideal gas X=32Rln(TTA)+Rln(VVA). Here, R is gas constant, V is volume of gas, TA and VA are constants.The List-I below gives some quantities involved in a process and List-II gives some possible values of these quantities. List-I List-II(i)Work done by the system in process 1→2→3(P)13RT0ln2(ii)Change in intermal energy in process 1→2→3(Q)13RT0(iii)Heat absorbed by the system in process 1→2→3(R)RT0(iv)Heat absotbed by the system in process 1→2(S)43RT0 (T)13RT0(3+ln2) (U)56RT0If the process carricd out on one mole of monoatomic ideal gas is as shown in figure in the PV-diagram with P0V0=13RT0, the correct match is,

Answer»

In a thermodynamic process on an ideal monatomic gas, the infinitesimal heat absorbed by the gas is given by $T Δ X$ , where $T$ is temperature of the system and $Δ X$ is the infinitesimal change in a thermodynamic quantity $X$ of the system. For a mole of monatomic ideal gas $X = \frac{3}{2} R ln (\frac{T}{T_{A}}) + Rln (\frac{V}{V_{A}}) .$ Here, $R$ is gas constant, $V$ is volume of gas, $T_{A}$ and $V_{A}$ are constants.

The List-I below gives some quantities involved in a process and List-II gives some possible values of these quantities.

	List-I		List-II
(i)	Work done by the system in process $1 \to 2 \to 3$	(P)	$\frac{1}{3} {R T}_{0} ln 2$
(ii)	Change in intermal energy in process $1 \to 2 \to 3$	(Q)	$\frac{1}{3} {R T}_{0}$
(iii)	Heat absorbed by the system in process $1 \to 2 \to 3$	(R)	${R T}_{0}$
(iv)	Heat absotbed by the system in process $1 \to 2$	(S)	$\frac{4}{3} {R T}_{0}$
		(T)	$\frac{1}{3} {R T}_{0} (3 + ln 2)$
		(U)	$\frac{5}{6} {R T}_{0}$

If the process carricd out on one mole of monoatomic ideal gas is as shown in figure in the PV-diagram with $P_{0} V_{0} = \frac{1}{3} {R T}_{0}$ , the correct match is,

Discussion

17.	A circular wire loop of radius R is placed in the x -y plane centered at the origin O . A square loop of side a(a<R) having two turns is placed with its center at z=√3R along the axis of the circular wire loop, as shown in figure. The plane of the square loop makes an angle of 45∘ with the positive z -axis. If the mutual inductance between the loops is given by μ0a22p/2R, then value of p is (Answer upto two digit after decimal places)
Answer» A circular wire loop of radius $R$ is placed in the x -y plane centered at the origin $O$ . A square loop of side $a (a < R)$ having two turns is placed with its center at $z = \sqrt{3} R$ along the axis of the circular wire loop, as shown in figure. The plane of the square loop makes an angle of $45^{\circ}$ with the positive $z$ -axis. If the mutual inductance between the loops is given by $\frac{μ_{0} a^{2}}{2^{p / 2} R},$ then value of p is (Answer upto two digit after decimal places)

Discussion

18.	A ball of mass 100 g is projected with a velocity of 50 m/s at 37∘ from horizontal. Using the concept of impulse, find the magnitude of change in velocity of ball in 2 s (Take g = 10 m/s2)
Answer» A ball of mass $100 g$ is projected with a velocity of $50 m/s$ at $37^{\circ}$ from horizontal. Using the concept of impulse, find the magnitude of change in velocity of ball in $2 s$ (Take g = 10 m/s $^{2}$ )

Discussion

19.	Calculate the frequency of beats produced in air when two sources of sound are activated, one emitting a wavelength of 32 cm and the other of 32.2 cm. The speed of sound in air is 350 m/s.
Answer» Calculate the frequency of beats produced in air when two sources of sound are activated, one emitting a wavelength of 32 cm and the other of 32.2 cm. The speed of sound in air is 350 m/s.

Discussion

20.	An engine pumps up 100 kg of water through a height of 10 m in 5 s. Given that the efficiency of the engine is 60%, what is the power of the engine? (Take g=10 m/s2)
Answer» An engine pumps up $100 kg$ of water through a height of $10 m$ in $5 s$ . Given that the efficiency of the engine is $60 %$ , what is the power of the engine? (Take $g = 10 m / s^{2}$ )

Discussion

21.	Q91. Which of the statement given below about Bureau of Energy Efficiency is/are correct? 1. It gives financial assistance to institutions for promoting efficient use of energy. 2. It is a statutory body under Energy Conservation Act, 2001. 3. It works under Ministry of New and Renewable Energy. Select the correct answer using the code given below.
Answer» Q91. Which of the statement given below about Bureau of Energy Efficiency is/are correct? 1. It gives financial assistance to institutions for promoting efficient use of energy. 2. It is a statutory body under Energy Conservation Act, 2001. 3. It works under Ministry of New and Renewable Energy. Select the correct answer using the code given below.

21.

Q91. Which of the statement given below about Bureau of Energy Efficiency is/are correct? 1. It gives financial assistance to institutions for promoting efficient use of energy. 2. It is a statutory body under Energy Conservation Act, 2001. 3. It works under Ministry of New and Renewable Energy. Select the correct answer using the code given below.

Answer»

Q91. Which of the statement given below about Bureau of Energy Efficiency is/are correct?

1. It gives financial assistance to institutions for promoting efficient use of energy.

2. It is a statutory body under Energy Conservation Act, 2001.

3. It works under Ministry of New and Renewable Energy.

Select the correct answer using the code given below.

Discussion

22.	A car starts form rest and accelerates uniformly over a time of 5 seconds for a distance of 110 m. The acceleration of the car will be
Answer» A car starts form rest and accelerates uniformly over a time of $5$ seconds for a distance of $110 m$ . The acceleration of the car will be

Discussion

23.	If velocity of a particle is v(t)=6−2t m/s, the average speed and magnitude of average velocity of the particle in 5 sec respectively are
Answer» If velocity of a particle is $v (t) = 6 - 2 t m/s$ , the average speed and magnitude of average velocity of the particle in $5 sec$ respectively are

Discussion

24.	A person riding a car moving at 72 km/h sounds a whistle emitting a wave of frequency 1250 Hz. What frequency will be heard by another person standing an the road (a) in front of the car (b) behind the car ? Speed of sound in air = 340 m/s.
Answer» A person riding a car moving at 72 km/h sounds a whistle emitting a wave of frequency 1250 Hz. What frequency will be heard by another person standing an the road (a) in front of the car (b) behind the car ? Speed of sound in air = 340 m/s.

Discussion

25.	A conic surface is placed in a uniform electric field E as shown such that field is perpendicular to the surface on the side AB. The base of the cone is of radius R and height of the cone is h. The angle of cone is θ as shown. Find the magnitude of that flux which enters the cone's curved surface on the left side. Don’t count the outgoing flux.
Answer» A conic surface is placed in a uniform electric field $E$ as shown such that field is perpendicular to the surface on the side AB. The base of the cone is of radius $R$ and height of the cone is $h$ . The angle of cone is $θ$ as shown. Find the magnitude of that flux which enters the cone's curved surface on the left side. Don’t count the outgoing flux.

25.

A conic surface is placed in a uniform electric field E as shown such that field is perpendicular to the surface on the side AB. The base of the cone is of radius R and height of the cone is h. The angle of cone is θ as shown. Find the magnitude of that flux which enters the cone's curved surface on the left side. Don’t count the outgoing flux.

Answer»

A conic surface is placed in a uniform electric field $E$ as shown such that field is perpendicular to the surface on the side AB. The base of the cone is of radius $R$ and height of the cone is $h$ . The angle of cone is $θ$ as shown. Find the magnitude of that flux which enters the cone's curved surface on the left side. Don’t count the outgoing flux.

Discussion

26.	A boy throws a ball upwards with a velocity of 5 m/s from a balloon descending with a constant velocity of 15 m/s. After how much time will the boy be able to catch the ball? Take g=10 m/s2 .
Answer» A boy throws a ball upwards with a velocity of $5 m/s$ from a balloon descending with a constant velocity of $15 m/s$ . After how much time will the boy be able to catch the ball? Take $g = 10 {m/s}^{2}$ .

Discussion

27.	A particle is projected horizontally with speed u from point A, which is 10 m above the inclined plane perpendicularly at point B. [g=10m/s2] Find horizontal speed with which the particle was projected
Answer» A particle is projected horizontally with speed u from point A, which is 10 m above the inclined plane perpendicularly at point B. $[g = 10 m / s^{2}]$ Find horizontal speed with which the particle was projected

Discussion

28.	A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the centre of the loop is B. It is then bent into a circular coil of n turns. The magnetic field at the centre of this coil of n turns will be:
Answer» A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the centre of the loop is B. It is then bent into a circular coil of n turns. The magnetic field at the centre of this coil of n turns will be:

Discussion

29.	Block B of mass 100 kg rests on a rough surface of friction coefficient μ=13. A rope is tied to block B as shown in figure. The maximum acceleration with which boy A of 25 kg can climbs on rope without making block move is (g=10 ms−2)
Answer» Block $B$ of mass $100 kg$ rests on a rough surface of friction coefficient $μ = \frac{1}{3}$ . A rope is tied to block $B$ as shown in figure. The maximum acceleration with which boy $A$ of $25 kg$ can climbs on rope without making block move is ( $g = 10 m s^{- 2}$ )

Discussion

30.	A body B lies on a smooth horizontal table and another body A is placed on B. The coefficient of friction between A and B is μ. What acceleration given to B will cause slipping to occur between A and B
Answer» A body B lies on a smooth horizontal table and another body A is placed on B. The coefficient of friction between A and B is $μ$ . What acceleration given to B will cause slipping to occur between A and B

Discussion

31.	How to find log of a number using log table
Answer» How to find log of a number using log table

Discussion

32.	Two charged particles are separated at a distance of 1 cm.what is the minimum possible magnitude of the electric force acting on each particle ?
Answer» Two charged particles are separated at a distance of 1 cm.what is the minimum possible magnitude of the electric force acting on each particle ?

Discussion

33.	The position vector →r=5.00t^i+(et+ft2)^j locates a particle as a function of time t. Vector →r is in meters, t is in seconds, and factors e and f are constants. Below Diagram gives the angle θ of the particle's direction of travel as a function of t(θ) is measured from the positive x direction). What are 'e' and 'f', including units?
Answer» The position vector $\to r = 5.00 t^i + (e t + f t^{2})^j$ locates a particle as a function of time t. Vector $\to r$ is in meters, t is in seconds, and factors e and f are constants. Below Diagram gives the angle $θ$ of the particle's direction of travel as a function of t( $θ$ ) is measured from the positive x direction). What are 'e' and 'f', including units?

33.

The position vector →r=5.00t^i+(et+ft2)^j locates a particle as a function of time t. Vector →r is in meters, t is in seconds, and factors e and f are constants. Below Diagram gives the angle θ of the particle's direction of travel as a function of t(θ) is measured from the positive x direction). What are 'e' and 'f', including units?

Answer»

The position vector $\to r = 5.00 t^i + (e t + f t^{2})^j$ locates a particle as a function of time t. Vector $\to r$ is in meters, t is in seconds, and factors e and f are constants. Below Diagram gives the angle $θ$ of the particle's direction of travel as a function of t( $θ$ ) is measured from the positive x direction). What are 'e' and 'f', including units?

Discussion

34.	One car is at rest and velocity of light from head light is c, then velocity of light from the headlight of moving car at velocity v, would be?
Answer» One car is at rest and velocity of light from head light is c, then velocity of light from the headlight of moving car at velocity v, would be?

Discussion

35.	One should not let the gaussian surface to pass through any discrete charge. This is because electric field due to a system of discrete charges is not well defined at the location of any charge. Explain this point .
Answer» One should not let the gaussian surface to pass through any discrete charge. This is because electric field due to a system of discrete charges is not well defined at the location of any charge. Explain this point .

Discussion

36.	A thin uniform solid wheel is initially rotating with an angular velocity 50 rad/s. The mass of the wheel is given to be 4 kg and the radius of the wheel is 1 m. If the wheel comes to rest in 10 s, find the magnitude of the average retarding torque acting on the wheel (in N-m) (Assume uniform angular retardation)
Answer» A thin uniform solid wheel is initially rotating with an angular velocity $50 rad/s$ . The mass of the wheel is given to be $4 kg$ and the radius of the wheel is $1 m$ . If the wheel comes to rest in $10 s$ , find the magnitude of the average retarding torque acting on the wheel (in $N-m$ ) (Assume uniform angular retardation)

Discussion

37.	A ball is dropped from the top of a 10 m high building. If the initial speed of the ball is zero, then what its speed after 2 sec(assume constant acceleration of 10m/s2 towards the surface of the Earth for any object falling near its surface)
Answer» A ball is dropped from the top of a 10 m high building. If the initial speed of the ball is zero, then what its speed after 2 sec(assume constant acceleration of 10m/s² towards the surface of the Earth for any object falling near its surface)

Discussion

38.	Calculate the magnitude of velocity of the image (Vs) with respect to a stationary observer in the following situation ( Object moving at an angle with the mirror and mirror is stationary).
Answer» Calculate the magnitude of velocity of the image $(V_{s})$ with respect to a stationary observer in the following situation ( Object moving at an angle with the mirror and mirror is stationary).

Discussion

39.	Why the gamma divides R =M
Answer» Why the gamma divides R =M

Discussion

40.	If a photon has velocity c and frequency v, then which of following represents its wavelength
Answer» If a photon has velocity c and frequency v, then which of following represents its wavelength

Discussion

41.	A source of the sound of frequency f1 is placed on the ground. A detector placed at a height is released from rest on this source. The observed frequency f(Hz) is plotted against time t(sec). The speed of sound in air is 300 m/s. Find f1(g=10m/s2).
Answer» A source of the sound of frequency $f_{1}$ is placed on the ground. A detector placed at a height is released from rest on this source. The observed frequency f(Hz) is plotted against time t(sec). The speed of sound in air is 300 m/s. Find $f_{1} (g = 10 m / s^{2})$ .

Discussion

42.	The total amount of energy in the universe is fixed, but
Answer» The total amount of energy in the universe is fixed, but

Discussion

43.	Find the equation of the straight line z(1 + i) = ¯¯¯z(i - 1)
Answer» Find the equation of the straight line z(1 + i) = $¯ ¯ ¯ z$ (i - 1)

Discussion

44.	A student sits atop a platform distance h above the ground. He throws a large object horizontally rightwards with speed u. A wind blowing parallel to the ground gives the object a convenient horizontal acceleration with magnitude a leftwards. This results in the object reaching the ground directly under the student. Determine the height h in terms of u, a, g. Ignore the effect of air resistance on vertical motion of the object.
Answer» A student sits atop a platform distance $h$ above the ground. He throws a large object horizontally rightwards with speed $u$ . A wind blowing parallel to the ground gives the object a convenient horizontal acceleration with magnitude $a$ leftwards. This results in the object reaching the ground directly under the student. Determine the height $h$ in terms of $u$ , $a$ , $g$ . Ignore the effect of air resistance on vertical motion of the object.

44.

A student sits atop a platform distance h above the ground. He throws a large object horizontally rightwards with speed u. A wind blowing parallel to the ground gives the object a convenient horizontal acceleration with magnitude a leftwards. This results in the object reaching the ground directly under the student. Determine the height h in terms of u, a, g. Ignore the effect of air resistance on vertical motion of the object.

Answer»

A student sits atop a platform distance $h$ above the ground. He throws a large object horizontally rightwards with speed $u$ . A wind blowing parallel to the ground gives the object a convenient horizontal acceleration with magnitude $a$ leftwards. This results in the object reaching the ground directly under the student. Determine the height $h$ in terms of $u$ , $a$ , $g$ . Ignore the effect of air resistance on vertical motion of the object.

Discussion

45.	In tug of war, the team that exerts a larger tangential force on the ground wins. Consider the period in which a team is dragging the opposite team by applying a larger tangential force on the ground. List which of the following works are negative? i.Work by the winning team on the losing team ii.Work by the losing team on the winning team iii.Work by the ground on the winning team iv.Work by the ground on the losing team
Answer» In tug of war, the team that exerts a larger tangential force on the ground wins. Consider the period in which a team is dragging the opposite team by applying a larger tangential force on the ground. List which of the following works are negative? i.Work by the winning team on the losing team ii.Work by the losing team on the winning team iii.Work by the ground on the winning team iv.Work by the ground on the losing team

45.

In tug of war, the team that exerts a larger tangential force on the ground wins. Consider the period in which a team is dragging the opposite team by applying a larger tangential force on the ground. List which of the following works are negative? i.Work by the winning team on the losing team ii.Work by the losing team on the winning team iii.Work by the ground on the winning team iv.Work by the ground on the losing team

Answer»

In tug of war, the team that exerts a larger tangential force on the ground wins. Consider the period in which a team is dragging the opposite team by applying a larger tangential force on the ground. List which of the following works are negative?

i.Work by the winning team on the losing team

ii.Work by the losing team on the winning team

iii.Work by the ground on the winning team

iv.Work by the ground on the losing team

Discussion

46.	an ideal gas undergoes isothermal expansion at constant pressure. during the process ,what happens to enthalpy and entropy, Do they remain constant??? Or one of them increases??
Answer» an ideal gas undergoes isothermal expansion at constant pressure. during the process ,what happens to enthalpy and entropy, Do they remain constant??? Or one of them increases??

46.

an ideal gas undergoes isothermal expansion at constant pressure. during the process ,what happens to enthalpy and entropy, Do they remain constant??? Or one of them increases??

Answer»

an ideal gas undergoes isothermal expansion at constant pressure. during the process ,what happens to enthalpy and entropy,

Do they remain constant???

Or one of them increases??

Discussion

47.	A solid conducting sphere having charge Q is surrounded by an uncharged concentric conducting hollow spherical shell . Let the potential difference between the surface of the solid sphere and the hollow sphere be V . The shell is now given a charge -3Q , what is the new potential differened?
Answer» A solid conducting sphere having charge Q is surrounded by an uncharged concentric conducting hollow spherical shell . Let the potential difference between the surface of the solid sphere and the hollow sphere be V . The shell is now given a charge -3Q , what is the new potential differened?

Discussion

48.	A rectangular vessel when full of water, takes 10 min to be emptied through an orifice at its bottom. How much time will it take to be emptied when it is half filled ?
Answer» A rectangular vessel when full of water, takes $10 min$ to be emptied through an orifice at its bottom. How much time will it take to be emptied when it is half filled ?

Discussion

49.	A smooth chain AB of mass m rests against a surface in the form of a quarter of a circle of radius R. If it is released from rest, the velocity of the chain after it comes over the horizontal part of the surface is
Answer» A smooth chain $A B$ of mass $m$ rests against a surface in the form of a quarter of a circle of radius $R$ . If it is released from rest, the velocity of the chain after it comes over the horizontal part of the surface is

Discussion

50.	Does light have any mass?
Answer» Does light have any mass?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

In a double slit pattern (λ=6000 A∘), the first order and tenth order maxima fall at 13.00 mm and 15.25 mm from a particular reference point. If λ is changed to 5500 A∘, find the position of tenth order fringe (in mm) (answer the nearest integer), other arrangement remaining the same.

A galvanometer can be converted to a voltmeter of full-scale deflection V0 by connecting a series resistance R1 and can be converted to an ammeter of full -scale deflection I0 by connecting a shunt resistance R2. What is the current flowing through the galvanometer at its full-scale deflection?

The angle made by vector 3^i+3^k with x-axis &amp; y-axis respectively are

The velocity of water wave v, may depend on their wavelength λ, the density of water ρ and the acceleration due to gravity g. The method of dimensions gives the relation between these quantities as: [where K is a dimensionless constant]

In figure, infinite conducting rings each having current i in the direction shown are placed concentrically in the same plane as shown in the figure. The radius of rings are r,2r,22r,23r....infinity). The magnetic field at the center of rings will be

An insulated container containing n moles of monoatomic gas of molar mass m is moving with a velocity v0. If the container is suddenly stopped, then the change in temperature is

When two displacements represented by y1=a sin (t) and y2=b cos(ωt) are superimposed the motion is :

Light of wavelength 6000∘A is incident normally on a single slit of width 24×10−5cm. Find out the angular position of second minimum from central maxima?

Hysteresis loops for two magnetic materials A and B are given below:

If two waves of same frequency and amplitude respectively on superposition produce a resultant disturbance of same amplitude the waves differ in phase by

The initial conditions of a particle executing SHM are as shown in the figure. Find the phase constant ϕ of the particle. Given: Range of ϕ is [0,2π]

A closed tube is filled with liquid ρ=800 kg/m3. It is rotating about an axis shown in figure with an angular velocity ω=4 rad/sec and length of the tube is 9 m. Find the pressure difference between the ends of the tube.

Speed is a _____ quantity but velocity is a _________ quantity.

As shown in figure, a man of mass M is standing on a platform and holding an inextensible massless string which passes over a system of ideal pulleys. Another body of mass m is hanging as shown in figure. Find the force exerted by the platform on man if M=50 kg,m=10 kg, Take g=10 m/s2.

A body thrown vertically up with a finite speed is caught back after 4 sec. The speed of the body with which it is thrown up is (Take g=10 m/s2)

A ball of mass 100 g is projected with a velocity of 50 m/s at 37∘ from horizontal. Using the concept of impulse, find the magnitude of change in velocity of ball in 2 s (Take g = 10 m/s2)

Calculate the frequency of beats produced in air when two sources of sound are activated, one emitting a wavelength of 32 cm and the other of 32.2 cm. The speed of sound in air is 350 m/s.

An engine pumps up 100 kg of water through a height of 10 m in 5 s. Given that the efficiency of the engine is 60%, what is the power of the engine? (Take g=10 m/s2)

A car starts form rest and accelerates uniformly over a time of 5 seconds for a distance of 110 m. The acceleration of the car will be

If velocity of a particle is v(t)=6−2t m/s, the average speed and magnitude of average velocity of the particle in 5 sec respectively are

A person riding a car moving at 72 km/h sounds a whistle emitting a wave of frequency 1250 Hz. What frequency will be heard by another person standing an the road (a) in front of the car (b) behind the car ? Speed of sound in air = 340 m/s.

A boy throws a ball upwards with a velocity of 5 m/s from a balloon descending with a constant velocity of 15 m/s. After how much time will the boy be able to catch the ball? Take g=10 m/s2 .

A particle is projected horizontally with speed u from point A, which is 10 m above the inclined plane perpendicularly at point B. [g=10m/s2] Find horizontal speed with which the particle was projected

A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the centre of the loop is B. It is then bent into a circular coil of n turns. The magnetic field at the centre of this coil of n turns will be:

Block B of mass 100 kg rests on a rough surface of friction coefficient μ=13. A rope is tied to block B as shown in figure. The maximum acceleration with which boy A of 25 kg can climbs on rope without making block move is (g=10 ms−2)

A body B lies on a smooth horizontal table and another body A is placed on B. The coefficient of friction between A and B is μ. What acceleration given to B will cause slipping to occur between A and B

How to find log of a number using log table

Two charged particles are separated at a distance of 1 cm.what is the minimum possible magnitude of the electric force acting on each particle ?

One car is at rest and velocity of light from head light is c, then velocity of light from the headlight of moving car at velocity v, would be?

One should not let the gaussian surface to pass through any discrete charge. This is because electric field due to a system of discrete charges is not well defined at the location of any charge. Explain this point .

A ball is dropped from the top of a 10 m high building. If the initial speed of the ball is zero, then what its speed after 2 sec(assume constant acceleration of 10m/s2 towards the surface of the Earth for any object falling near its surface)

Calculate the magnitude of velocity of the image (Vs) with respect to a stationary observer in the following situation ( Object moving at an angle with the mirror and mirror is stationary).

Why the gamma divides R =M

If a photon has velocity c and frequency v, then which of following represents its wavelength

A source of the sound of frequency f1 is placed on the ground. A detector placed at a height is released from rest on this source. The observed frequency f(Hz) is plotted against time t(sec). The speed of sound in air is 300 m/s. Find f1(g=10m/s2).

The total amount of energy in the universe is fixed, but

Find the equation of the straight line z(1 + i) = ¯¯¯z(i - 1)

an ideal gas undergoes isothermal expansion at constant pressure. during the process ,what happens to enthalpy and entropy, Do they remain constant??? Or one of them increases??

A solid conducting sphere having charge Q is surrounded by an uncharged concentric conducting hollow spherical shell . Let the potential difference between the surface of the solid sphere and the hollow sphere be V . The shell is now given a charge -3Q , what is the new potential differened?

A rectangular vessel when full of water, takes 10 min to be emptied through an orifice at its bottom. How much time will it take to be emptied when it is half filled ?

A smooth chain AB of mass m rests against a surface in the form of a quarter of a circle of radius R. If it is released from rest, the velocity of the chain after it comes over the horizontal part of the surface is

Does light have any mass?

The angle made by vector 3^i+3^k with x-axis & y-axis respectively are

Speed is a _ quantity but velocity is a _____ quantity.