50278 + Interview Questions in Physics

1.	A point particle of mass M is attached to one end of a massless rigid non-conducting rod of length L. Another point particle of same mass is attached to the other end of the rod. The two particles carry charges +q and −q repectively. This arrangement is held in a region of uniform electric field E such that the rod makes a small angle (θ<5∘) with the field direction. The minimum time needed for the rod to become parallel to the field after it is set free. (rod rotates about centre of mass)
Answer» A point particle of mass $M$ is attached to one end of a massless rigid non-conducting rod of length $L$ . Another point particle of same mass is attached to the other end of the rod. The two particles carry charges $+ q$ and $- q$ repectively. This arrangement is held in a region of uniform electric field $E$ such that the rod makes a small angle $(θ < 5^{\circ})$ with the field direction. The minimum time needed for the rod to become parallel to the field after it is set free. (rod rotates about centre of mass)

Discussion

2.	One quarter section is cut from a uniform circular disc of radius R. This section has a mass M. It is made to rotate about a line perpendicular to its plane and passing through the centre of the original disc. Its moment of inertia about the axis of rotation is
Answer» One quarter section is cut from a uniform circular disc of radius R. This section has a mass M. It is made to rotate about a line perpendicular to its plane and passing through the centre of the original disc. Its moment of inertia about the axis of rotation is

2.

One quarter section is cut from a uniform circular disc of radius R. This section has a mass M. It is made to rotate about a line perpendicular to its plane and passing through the centre of the original disc. Its moment of inertia about the axis of rotation is

Answer»

One quarter section is cut from a uniform circular disc of radius R. This section has a mass M. It is made to rotate about a line perpendicular to its plane and passing through the centre of the original disc. Its moment of inertia about the axis of rotation is

Discussion

3.	Two soap bubbles of radii 2cm and 4cm join to form a double bubble in air, then radius of curvature of interface i
Answer» Two soap bubbles of radii 2cm and 4cm join to form a double bubble in air, then radius of curvature of interface i

Discussion

4.	A solid cylinder of mass 50 kg and radius 0.5 m is free to rotate about the horizontal axis. A massless string is wound round the cylinder with one end attached to it and other hanging freely. Tension in the string required to produce an angular acceleration of 2 rev/s2 is
Answer» A solid cylinder of mass $50 kg$ and radius $0.5 m$ is free to rotate about the horizontal axis. A massless string is wound round the cylinder with one end attached to it and other hanging freely. Tension in the string required to produce an angular acceleration of $2 {rev/s}^{2}$ is

Discussion

5.	From a planet of mass 16M and radius 4R, we wish to send an object to its moon of mass M and radius R. Distance between centres of planet and moon is 10R. Minimum speed at which object should be projected from the surface of planet so that it reaches moon is (Assume that the planet and the moon are at rest)
Answer» From a planet of mass $16 M$ and radius $4 R$ , we wish to send an object to its moon of mass $M$ and radius $R$ . Distance between centres of planet and moon is $10 R$ . Minimum speed at which object should be projected from the surface of planet so that it reaches moon is (Assume that the planet and the moon are at rest)

Discussion

6.	The electrostatic force on a small sphere of charge 0.4 μC due to another small sphere of charge –0.8 μC in air is 0.2 N. What is the distance between the two spheres? What is the force on the second sphere due to the first?
Answer» The electrostatic force on a small sphere of charge 0.4 $μ$ C due to another small sphere of charge –0.8 $μ$ C in air is 0.2 N. What is the distance between the two spheres? What is the force on the second sphere due to the first?

Discussion

7.	If gE and gM are the accelerations due to gravity on the surfaces of the earth and moon respectively and if Milikan's oil drop experiment could be performed on the two surfaces, one will find the ratio electronic charge on the moonelectronic charge on the earth to be:(What Millikan did was to put a charge on a tiny drop of oil, and measure how strong an applied electric field had to be in order to stop the oil drop from falling.)
Answer» If $g_{E}$ and $g_{M}$ are the accelerations due to gravity on the surfaces of the earth and moon respectively and if Milikan's oil drop experiment could be performed on the two surfaces, one will find the ratio $\frac{electronic charge on the moon}{electronic charge on the earth}$ to be: (What Millikan did was to put a charge on a tiny drop of oil, and measure how strong an applied electric field had to be in order to stop the oil drop from falling.)

Discussion

8.	Explain why (or how): (a) in a sound wave, a displacement node is a pressure antinode and vice versa, (b) bats can ascertain distances, directions, nature, and sizes of the obstacles without any “eyes”, (c) a violin note and sitar note may have the same frequency, yet we can distinguish between the two notes, (d) solids can support both longitudinal and transverse waves, but only longitudinal waves can propagate in gases, and (e) the shape of a pulse gets distorted during propagation in a dispersive medium
Answer» Explain why (or how): (a) in a sound wave, a displacement node is a pressure antinode and vice versa, (b) bats can ascertain distances, directions, nature, and sizes of the obstacles without any “eyes”, (c) a violin note and sitar note may have the same frequency, yet we can distinguish between the two notes, (d) solids can support both longitudinal and transverse waves, but only longitudinal waves can propagate in gases, and (e) the shape of a pulse gets distorted during propagation in a dispersive medium

Discussion

9.	A block of mass m and a pan of equal mass are connected by a string which is going over a smooth light pulley as shown in the figure. The system is at rest initially when a particle of mass ‘m’ falls on the pan and sticks to it. If the particle strikes the pan with a speed v, find the speed with which the system moves just after the collision.
Answer» A block of mass m and a pan of equal mass are connected by a string which is going over a smooth light pulley as shown in the figure. The system is at rest initially when a particle of mass ‘m’ falls on the pan and sticks to it. If the particle strikes the pan with a speed v, find the speed with which the system moves just after the collision.

Discussion

10.	Km and other unit which are not a part of fundamental units come in which type of unit?
Answer» Km and other unit which are not a part of fundamental units come in which type of unit?

Discussion

11.	The maximum number of photons emitted by a hydrogen atom , if the atom is excited to the states with principal quantum number four is-
Answer» The maximum number of photons emitted by a hydrogen atom , if the atom is excited to the states with principal quantum number four is-

Discussion

12.	The galvanometer shown in the figure has a resistance 50 Ω and full-scale deflection current 1 mA. What are the the resistances R1,R2 and R3 required to convert it into ammeter having ranges as indicated?
Answer» The galvanometer shown in the figure has a resistance $50 Ω$ and full-scale deflection current 1 mA. What are the the resistances $R_{1}, R_{2}$ and $R_{3}$ required to convert it into ammeter having ranges as indicated?

Discussion

13.	If you hold a strong permanent magnet inside a metal ring and then quickly remove that magnet, you create an electric field in the metal ring and some electrical current flows through the metal ring. If you repeat this procedure with a glass ring, no current flows in the glass ring because
Answer» If you hold a strong permanent magnet inside a metal ring and then quickly remove that magnet, you create an electric field in the metal ring and some electrical current flows through the metal ring. If you repeat this procedure with a glass ring, no current flows in the glass ring because

Discussion

14.	The diagram shows four pairs of polarizing sheets, with the polarizing directions indicated by dashed lines. The two sheets of each pair are placed one behind the other, and the front sheet is illuminated by unpolarized light. The incident intensity is the same for all pairs of sheets. Rank the pairs according to the intensity of the transmitted light, least to greatest.
Answer» The diagram shows four pairs of polarizing sheets, with the polarizing directions indicated by dashed lines. The two sheets of each pair are placed one behind the other, and the front sheet is illuminated by unpolarized light. The incident intensity is the same for all pairs of sheets. Rank the pairs according to the intensity of the transmitted light, least to greatest.

Discussion

15.	What is validation and expression in dimensional analysis??
Answer» What is validation and expression in dimensional analysis??

Discussion

16.	Q.A stone is tied in a string of length L and whirled in a vertical circle such that it just completes the circle. find the acceleration of the stone when the string is horizontal.
Answer» Q.A stone is tied in a string of length L and whirled in a vertical circle such that it just completes the circle. find the acceleration of the stone when the string is horizontal.

Discussion

17.	A person is drawing a heavy bag of sand of mass 80 kg from ground to the top of his house which is 7 m high. If bag reaches the man with a speed of 1 m/s then total work done by person is -
Answer» A person is drawing a heavy bag of sand of mass 80 kg from ground to the top of his house which is 7 m high. If bag reaches the man with a speed of 1 m/s then total work done by person is -

Discussion

18.	In the P-Vdiagram show, moles of a gas are taken through a process from state i to f, at constant pressure. Part of the heat must have gone into doing the work PΔV, and the rest in increasing the internal energy. If the molar specific heat at constant volume for the gas is CV, and the initial total internal energy is Ui, what is the final internal energy Uf?
Answer» In the P-Vdiagram show, moles of a gas are taken through a process from state i to f, at constant pressure. Part of the heat must have gone into doing the work $P Δ V$ , and the rest in increasing the internal energy. If the molar specific heat at constant volume for the gas is $C_{V}$ , and the initial total internal energy is $U_{i}$ , what is the final internal energy $U_{f}$ ?

18.

In the P-Vdiagram show, moles of a gas are taken through a process from state i to f, at constant pressure. Part of the heat must have gone into doing the work PΔV, and the rest in increasing the internal energy. If the molar specific heat at constant volume for the gas is CV, and the initial total internal energy is Ui, what is the final internal energy Uf?

Answer»

In the P-Vdiagram show, moles of a gas are taken through a process from state i to f, at constant pressure. Part of the heat must have gone into doing the work $P Δ V$ , and the rest in increasing the internal energy. If the molar specific heat at constant volume for the gas is $C_{V}$ , and the initial total internal energy is $U_{i}$ , what is the final internal energy $U_{f}$ ?

Discussion

19.	The velocity of car increase from 54km/hr to 72km/hr.How much is the work done if the mass of the car is 1500 kg?
Answer» The velocity of car increase from 54km/hr to 72km/hr.How much is the work done if the mass of the car is 1500 kg?

Discussion

20.	The equivalent capacitance between A and B in the given circuit is
Answer» The equivalent capacitance between A and B in the given circuit is

Discussion

21.	A muonic atom contains a nucleus of charge Ze and a negative muon, μ−, moving about it. The μ− is an elementary charge with -e and a mass that is approximately 200 times as large as an electron mass. Calculate the binding energy of a muonic atom(in eV) with Z=1.
Answer» A muonic atom contains a nucleus of charge Ze and a negative muon, $μ^{-}$ , moving about it. The $μ^{-}$ is an elementary charge with -e and a mass that is approximately 200 times as large as an electron mass. Calculate the binding energy of a muonic atom(in eV) with $Z = 1$ .

Discussion

22.	An AC source of angular frequency ω is applied across an inductor. The instantaneous power developed in the circuit, has an angular frequency of,
Answer» An AC source of angular frequency $ω$ is applied across an inductor. The instantaneous power developed in the circuit, has an angular frequency of,

Discussion

23.	5m/s23.The tension in the string connected between blocks isN 4 kg2 kgF2= 10 NF, 20 N(Smooth surface)80N340(1)(2)350(3)7(4) 26 N
Answer» 5m/s23.The tension in the string connected between blocks isN 4 kg2 kgF2= 10 NF, 20 N(Smooth surface)80N340(1)(2)350(3)7(4) 26 N

Discussion

24.	A particle, of mass 10–3 kg and charge 1.0 C, is initially at rest. At time t=0 sec the particle comes under the influence of an electric field →E(t)=E0sinωt^i, where E0=1.0 N C−1 and ω=103 rad s–1. Consider the effect of only the electrical force on the particle. Then the maximum speed, in m s–1, attained by the particle at subsequent times is
Answer» A particle, of mass $10^{- 3} k g$ and charge $1.0 C,$ is initially at rest. At time $t = 0 s e c$ the particle comes under the influence of an electric field $\to E (t) = E_{0} sin ω t^i,$ where $E_{0} = 1.0 N C^{- 1}$ and $ω = 10^{3}$ rad $s^{- 1}$ . Consider the effect of only the electrical force on the particle. Then the maximum speed, in ${m s}^{- 1,}$ attained by the particle at subsequent times is

Discussion

25.	A small box of mass m is placed on the outer surface of a smooth fixed sphere of radius R at a point where the radius makes an angle ϕ with the vertical. The box is released from this position. Find the distance travelled by the box before it leaves contact with the sphere.
Answer» A small box of mass $m$ is placed on the outer surface of a smooth fixed sphere of radius $R$ at a point where the radius makes an angle $ϕ$ with the vertical. The box is released from this position. Find the distance travelled by the box before it leaves contact with the sphere.

Discussion

26.	The velocity of a particle as a function of its position x is expressed as v=(c1+c2x) where c1 and c2 are positive constants. The acceleration of particle is?
Answer» The velocity of a particle as a function of its position x is expressed as v=(c1+c2x) where c1 and c2 are positive constants. The acceleration of particle is?

Discussion

27.	In the figure shown, a ring A is initially rolling without sliding with a velocity v on a horizontal surface of the body B (of same mass as A). All surfaces are smooth. B has no initial velocity. What will be the maximum height reached by A on B?
Answer» In the figure shown, a ring $A$ is initially rolling without sliding with a velocity $v$ on a horizontal surface of the body $B$ (of same mass as $A$ ). All surfaces are smooth. $B$ has no initial velocity. What will be the maximum height reached by $A$ on $B$ ?

Discussion

28.	A block is released from rest from a height h=5 m. After travelling through the smooth curved surface, it moves on the rough horizontal surface through a length l=8 m and climbs onto the other smooth curved surface through a height h′. If coefficient of friction of the rough surface is μ=0.5, find h′.
Answer» A block is released from rest from a height $h = 5 m$ . After travelling through the smooth curved surface, it moves on the rough horizontal surface through a length $l = 8 m$ and climbs onto the other smooth curved surface through a height $h^{^{'}}$ . If coefficient of friction of the rough surface is $μ = 0.5$ , find $h^{^{'}}$ .

Discussion

29.	how to determine that the equation is of simple harmonic motion?
Answer» how to determine that the equation is of simple harmonic motion?

Discussion

30.	A particle is moving along a circular path with uniform speed. Through what angle does its angular velocity change when it completes half of the circular path?
Answer» A particle is moving along a circular path with uniform speed. Through what angle does its angular velocity change when it completes half of the circular path?

Discussion

31.	a car of mass 2000kg changes speed from 72km/h to 36km/h find the force required
Answer» a car of mass 2000kg changes speed from 72km/h to 36km/h find the force required

Discussion

32.	A gun fires shells with maximum speed of 180 kmph.If a target farther away by distance 25m beyond maximum range has to be hit with same gun what height it is to be raise at same position 1)22.5 2)25.5 3)27.5 4)29.5
Answer» A gun fires shells with maximum speed of 180 kmph.If a target farther away by distance 25m beyond maximum range has to be hit with same gun what height it is to be raise at same position 1)22.5 2)25.5 3)27.5 4)29.5

Discussion

33.	A square lamina is made up of a combination of 4 smaller square plates. The density of plates are different and the whole arrangement is shown in the figure. Find out the distance of COM of given system from its geometric centre.
Answer» A square lamina is made up of a combination of $4$ smaller square plates. The density of plates are different and the whole arrangement is shown in the figure. Find out the distance of $COM$ of given system from its geometric centre.

Discussion

34.	Weight and normal reaction forces
Answer» Weight and normal reaction forces

Discussion

35.	38. Consider two rods of same lengths and differentspecific heats (S,, S2), conductivities (K K andarea of cross-sections (A, A,) and both havingtemperatures T, and T at their ends. If rate of flowof heat due to conduction is equal, thenK,A1(2)S1S2(1) K,A,K2A, K,A2S1(4) S2(3) KA, = K,A2
Answer» 38. Consider two rods of same lengths and differentspecific heats (S,, S2), conductivities (K K andarea of cross-sections (A, A,) and both havingtemperatures T, and T at their ends. If rate of flowof heat due to conduction is equal, thenK,A1(2)S1S2(1) K,A,K2A, K,A2S1(4) S2(3) KA, = K,A2

Discussion

36.	Let normal at point P(1,2) on the curve xy=2 meets the curve again at point Q, then the value of 4PQ25=
Answer» Let normal at point $P (1, 2)$ on the curve $x y = 2$ meets the curve again at point $Q,$ then the value of $\frac{4 P Q^{2}}{5} =$

Discussion

37.	A particle is projected with velocity of u=30^i+40^j. Its velocity after 2 seconds is Take (g=10 m/s2)
Answer» A particle is projected with velocity of $u = 30^i + 40^j$ . Its velocity after $2$ seconds is Take $(g = 10 m / s^{2})$

Discussion

38.	The track shown in figure (9-E16) is frictionless. The block B of mass 2m is lying at rest and the block A of mass m is pushed along the track with some speed. the collision between A and B is perfectly elastic. With what velocity should the block A be started to get the sleeping man awakened ?
Answer» The track shown in figure (9-E16) is frictionless. The block B of mass 2m is lying at rest and the block A of mass m is pushed along the track with some speed. the collision between A and B is perfectly elastic. With what velocity should the block A be started to get the sleeping man awakened ?

38.

The track shown in figure (9-E16) is frictionless. The block B of mass 2m is lying at rest and the block A of mass m is pushed along the track with some speed. the collision between A and B is perfectly elastic. With what velocity should the block A be started to get the sleeping man awakened ?

Answer»

The track shown in figure (9-E16) is frictionless. The block B of mass 2m is lying at rest and the block A of mass m is pushed along the track with some speed. the collision between A and B is perfectly elastic. With what velocity should the block A be started to get the sleeping man awakened ?

Discussion

39.	The emf induced in an inductor having a resistance of 2Ω varies a shown in figure. The charge induced in the inductor in 4 μs is
Answer» The emf induced in an inductor having a resistance of 2 $Ω$ varies a shown in figure. The charge induced in the inductor in 4 $μ$ s is

39.

The emf induced in an inductor having a resistance of 2Ω varies a shown in figure. The charge induced in the inductor in 4 μs is

Answer»

The emf induced in an inductor having a resistance of 2 $Ω$ varies a shown in figure. The charge induced in the inductor in 4 $μ$ s is

Discussion

40.	Two blocks of masses 5 kg and 2 kg are placed on a frictionless surface and connected by a spring. An external kick gives a velocity of 14 m/sec to the heavier block towards the lighter one. The velocity gained by the centre of mass is
Answer» Two blocks of masses 5 kg and 2 kg are placed on a frictionless surface and connected by a spring. An external kick gives a velocity of 14 m/sec to the heavier block towards the lighter one. The velocity gained by the centre of mass is

Discussion

41.	A person can jump 1 feet high on the earth.how high he will jump on the moon?
Answer» A person can jump 1 feet high on the earth.how high he will jump on the moon?

Discussion

42.	The energy in MeV released due to conversion of 1 kg mass completely into energy is (c=3×108 ms−1)
Answer» The energy in $MeV$ released due to conversion of $1 kg$ mass completely into energy is $(c = 3 \times 10^{8} {ms}^{- 1})$

Discussion

43.	To observed diffraction, The size of the obstacle
Answer» To observed diffraction, The size of the obstacle

Discussion

44.	A uniform rod of length l is mounted so as to rotate about a horizontal axis perpendicular to the rod and at a distance x from the center of mass. The time period is least when x
Answer» A uniform rod of length l is mounted so as to rotate about a horizontal axis perpendicular to the rod and at a distance x from the center of mass. The time period is least when x

Discussion

45.	43. What is the cause of refraction?
Answer» 43. What is the cause of refraction?

Discussion

46.	In the arrangement shown, end A of light inextensible string is pulled up with constant velocity v. The velocity of block B is
Answer» In the arrangement shown, end $A$ of light inextensible string is pulled up with constant velocity $v$ . The velocity of block $B$ is

Discussion

47.	A car moves on a circular track of radius r in a horizontal plane. The speed of the car is increasing constantly at a rate of dvdt=a. The coefficient of static friction between the road and the tyre is μ. Find the speed at which the car will skid.
Answer» A car moves on a circular track of radius $r$ in a horizontal plane. The speed of the car is increasing constantly at a rate of $\frac{d v}{d t} = a$ . The coefficient of static friction between the road and the tyre is $μ$ . Find the speed at which the car will skid.

Discussion

48.	A cylindrical capacitor has two co-axial cylindersof length 20 cm and radii 2r and r. Inner cylinderis given a charge 10 uC and outer cylinder acharge of-10 μ C. The potential difference betweenthe two cylinders will beIn 24πε oIn 201th SmV (2)(1) 4πε 0m V0.01 In 210 In 24πε 0m V(3)(4)4πε 0
Answer» A cylindrical capacitor has two co-axial cylindersof length 20 cm and radii 2r and r. Inner cylinderis given a charge 10 uC and outer cylinder acharge of-10 μ C. The potential difference betweenthe two cylinders will beIn 24πε oIn 201th SmV (2)(1) 4πε 0m V0.01 In 210 In 24πε 0m V(3)(4)4πε 0

Discussion

49.	The capacitor in the circuit is initially uncharged. Find out current I1, I2, and I3 just after the switch is closed.
Answer» The capacitor in the circuit is initially uncharged. Find out current $I_{1}, I_{2},$ and $I_{3}$ just after the switch is closed.

Discussion

50.	The state of 2D stress at a point is given by a matrix The maximum shear stress is MPa.[σxxτxyτyxσyy]=[120808040]MPa89.44
Answer» The state of 2D stress at a point is given by a matrix The maximum shear stress is MPa. $[\begin{matrix} σ_{x x} & τ_{x y} τ_{y x} & σ_{y y} \end{matrix}] = [\begin{matrix} 120 & 80 80 & 40 \end{matrix}] MPa$ 89.44

50.

The state of 2D stress at a point is given by a matrix The maximum shear stress is MPa.[σxxτxyτyxσyy]=[120808040]MPa89.44

Answer»

The state of 2D stress at a point is given by a matrix The maximum shear stress is MPa.

$[\begin{matrix} σ_{x x} & τ_{x y} τ_{y x} & σ_{y y} \end{matrix}] = [\begin{matrix} 120 & 80 80 & 40 \end{matrix}] MPa$

89.44

Discussion

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