50278 + Interview Questions in Physics

1.	Why does the friction increase for a car with wider wheels , even though friction doesn't depend on area?
Answer» Why does the friction increase for a car with wider wheels , even though friction doesn't depend on area?

Discussion

2.	You are given two identical looking bars A and B. One of them is a bar magnet, while the other is an iron bar. How will you distinguish them without using any other material?
Answer» You are given two identical looking bars A and B. One of them is a bar magnet, while the other is an iron bar. How will you distinguish them without using any other material?

Discussion

3.	A particle moves in the x−y plane under the influence of a force such that its linear momentum is →p(t)=A[cos(kt)^i−sin(kt)^j], where A and k are constants. The angle between the force and the momentum is :
Answer» A particle moves in the $x - y$ plane under the influence of a force such that its linear momentum is $\to p (t) = A [cos (k t)^i - sin (k t)^j]$ , where $A$ and $k$ are constants. The angle between the force and the momentum is :

Discussion

4.	Find the change in the internal energy of a gas when it absorbs 80 calories of heat and performs work equal to 170 joules
Answer» Find the change in the internal energy of a gas when it absorbs 80 calories of heat and performs work equal to 170 joules

Discussion

5.	Between two stations, a train accelerates from rest uniformly at first, then moves with constant velocity, and finally retards uniformly to come to rest. If the ratio of the time taken is 1:8:1 and the maximum speed attained be 60km/hr, then what is the average speed over the whole journey? a) 48km/h b) 52km/h c) 54km/h d) 56Km/h
Answer» Between two stations, a train accelerates from rest uniformly at first, then moves with constant velocity, and finally retards uniformly to come to rest. If the ratio of the time taken is 1:8:1 and the maximum speed attained be 60km/hr, then what is the average speed over the whole journey? a) 48km/h b) 52km/h c) 54km/h d) 56Km/h

5.

Between two stations, a train accelerates from rest uniformly at first, then moves with constant velocity, and finally retards uniformly to come to rest. If the ratio of the time taken is 1:8:1 and the maximum speed attained be 60km/hr, then what is the average speed over the whole journey? a) 48km/h b) 52km/h c) 54km/h d) 56Km/h

Answer»

Between two stations, a train accelerates from rest uniformly at first, then moves with constant velocity, and finally retards uniformly to come to rest. If the ratio of the time taken is 1:8:1 and the maximum speed attained be 60km/hr, then what is the average speed over the whole journey?

a) 48km/h

b) 52km/h

c) 54km/h

d) 56Km/h

Discussion

6.	Assertion (A): When a solid copper sphere and solid wooden sphere both have same mass are spinning about their own axis with same angular velocity then wooden sphere has greater angular momentum Reason (R): Wood is less denser than copper so radius of wooden sphere is more than that of copper and so also moment of inertia.
Answer» Assertion (A): When a solid copper sphere and solid wooden sphere both have same mass are spinning about their own axis with same angular velocity then wooden sphere has greater angular momentum Reason (R): Wood is less denser than copper so radius of wooden sphere is more than that of copper and so also moment of inertia.

6.

Assertion (A): When a solid copper sphere and solid wooden sphere both have same mass are spinning about their own axis with same angular velocity then wooden sphere has greater angular momentum Reason (R): Wood is less denser than copper so radius of wooden sphere is more than that of copper and so also moment of inertia.

Answer»

Assertion (A): When a solid copper sphere and solid wooden sphere both

have same mass are spinning about their own axis with same angular

velocity then wooden sphere has greater angular momentum

Reason (R): Wood is less denser than copper so radius of wooden sphere is more than that of copper and so also moment of inertia.

Discussion

7.	What is the slope of tangent from origin to the circle (x−5)2+y2=16
Answer» What is the slope of tangent from origin to the circle $(x - 5)^{2} + y^{2} = 16$

Discussion

8.	Why is a lead plate used in Rutherford's alpha-particle scattering experiment?
Answer» Why is a lead plate used in Rutherford's alpha-particle scattering experiment?

Discussion

9.	A motorcyclist moving with uniform retardation takes 10s and 20s to travel successive quarter kilometer.How much farther will he travel before coming to rest?
Answer» A motorcyclist moving with uniform retardation takes 10s and 20s to travel successive quarter kilometer.How much farther will he travel before coming to rest?

Discussion

10.	Work done in moving an electric charge and difference in potential is called potential difference here what is the work done
Answer» Work done in moving an electric charge and difference in potential is called potential difference here what is the work done

Discussion

11.	Initially, the spring is at its natural length and collision between blocks of mass m & m is elastic. The horizontal surface is smooth. Then, maximum compression of the spring during the motion will be:
Answer» Initially, the spring is at its natural length and collision between blocks of mass $m & m$ is elastic. The horizontal surface is smooth. Then, maximum compression of the spring during the motion will be:

Discussion

12.	For a projectile projected from ground at an angle θ with horizontal, gT2=2R√3, where T is time of fight, R is horizontal range of projectile, g is acceleration due to gravity. The angle of projection (θ) is
Answer» For a projectile projected from ground at an angle $θ$ with horizontal, $g T^{2} = \frac{2 R}{\sqrt{3}}$ , where $T$ is time of fight, $R$ is horizontal range of projectile, $g$ is acceleration due to gravity. The angle of projection $(θ)$ is

Discussion

13.	Two springs of force constants k1 and k2 are connected as shown in the figure. The time period of vertical oscillations of mass m is given by
Answer» Two springs of force constants $k_{1}$ and $k_{2}$ are connected as shown in the figure. The time period of vertical oscillations of mass m is given by

Discussion

14.	The moment of inertia of two spheres of equal masses about their diameters is the same. One is hallow, then the ratio of their diameters is
Answer» The moment of inertia of two spheres of equal masses about their diameters is the same. One is hallow, then the ratio of their diameters is

Discussion

15.	If we double the radius of a current carrying coil keeping the current unchanged. what happens to the magnetic field at its centre?
Answer» If we double the radius of a current carrying coil keeping the current unchanged. what happens to the magnetic field at its centre?

Discussion

16.	In a uniform magnetic field B, a wire in the form of a semicircle of radius r rotates about the diameter of the circle with an angular frequency ω. The axis of rotation is perpendicular to the field. If the total resistance of the circuit is R, the mean power generated per period of rotation is
Answer» In a uniform magnetic field B, a wire in the form of a semicircle of radius r rotates about the diameter of the circle with an angular frequency $ω$ . The axis of rotation is perpendicular to the field. If the total resistance of the circuit is R, the mean power generated per period of rotation is

Discussion

17.	Light from two source, each of same frequency and travelling in same direction, but with intensity in the ratio 4 :1 interfere. Find ratio of maximum to minimum intensity.
Answer» Light from two source, each of same frequency and travelling in same direction, but with intensity in the ratio 4 :1 interfere. Find ratio of maximum to minimum intensity.

Discussion

18.	The ratio of Young's modulus of the material of two wires is 2 : 3. If the same stress is applied on both, then the ratio of elastic energy per unit volume will be
Answer» The ratio of Young's modulus of the material of two wires is 2 : 3. If the same stress is applied on both, then the ratio of elastic energy per unit volume will be

Discussion

19.	A barometer correctly reads the atmospheric pressure as 76 cm of mercury. Water droplets are slowly introduced into the barometer tube by a dropper. The height of the mercury column first decreases and then becomes constant. If the saturation vapour pressure at the atmospheric temperature is 0.80 cm of mercury, find the height of the mercury column when it reaches its minimum value.
Answer» A barometer correctly reads the atmospheric pressure as 76 cm of mercury. Water droplets are slowly introduced into the barometer tube by a dropper. The height of the mercury column first decreases and then becomes constant. If the saturation vapour pressure at the atmospheric temperature is 0.80 cm of mercury, find the height of the mercury column when it reaches its minimum value.

Discussion

20.	A body P strikes another body Q of mass that is p times that of body P and moving with a velocity that is 1q of the velocity of body P. If body P comes to rest, the coefficient of restitution is
Answer» A body P strikes another body Q of mass that is $p$ times that of body P and moving with a velocity that is $\frac{1}{q}$ of the velocity of body P. If body P comes to rest, the coefficient of restitution is

Discussion

21.	A 500 kg car takes a round turn of radius 50 m with a velocity of 36 km/hr. The centripetal force is
Answer» A 500 kg car takes a round turn of radius 50 m with a velocity of 36 km/hr. The centripetal force is

Discussion

22.	Find x such that the four points A(4,1,2),B(5, x,6),C(5,1,-1) and D(7,4,0)are coplanar.
Answer» Find x such that the four points A(4,1,2),B(5, x,6),C(5,1,-1) and D(7,4,0)are coplanar.

Discussion

23.	A body of mass 'm' collides against a wall with a velocity 'v' and retraces its path with the same speed. The change in momentum is (take initial direction of velocity as positive)
Answer» A body of mass 'm' collides against a wall with a velocity 'v' and retraces its path with the same speed. The change in momentum is (take initial direction of velocity as positive)

23.

A body of mass 'm' collides against a wall with a velocity 'v' and retraces its path with the same speed. The change in momentum is (take initial direction of velocity as positive)

Answer»

A body of mass 'm' collides against a wall with a velocity 'v' and retraces its path with the same speed. The change in momentum is (take initial direction of velocity as positive)

Discussion

24.	There are two bodies of masses 100 kg and 10000 kg separated by a distance 1 m. At what distance from the smaller body, the intensity of gravitational field will be zero
Answer» There are two bodies of masses 100 kg and 10000 kg separated by a distance 1 m. At what distance from the smaller body, the intensity of gravitational field will be zero

Discussion

25.	A 100 g iron ball having velocity 10 m/s collides with a wall at an angle 30o and rebounds with the same angle. If the period of contact between the ball and wall is 0.1 second, then the force experienced by the wall is
Answer» A 100 g iron ball having velocity 10 m/s collides with a wall at an angle $30^{o}$ and rebounds with the same angle. If the period of contact between the ball and wall is 0.1 second, then the force experienced by the wall is

Discussion

26.	Wave pulse on a string shown in figure is moving to the right without changing shape. Consider two particles at positions x1=1.5 m and x2=2.5 m. Their transverse velocities at the moment shown in figure are along directions.
Answer» Wave pulse on a string shown in figure is moving to the right without changing shape. Consider two particles at positions $x_{1} = 1.5 m a n d x_{2} = 2.5 m$ . Their transverse velocities at the moment shown in figure are along directions.

Discussion

27.	If a man at the equator would weigh (35)th of his weight, the angular speed of the earth is
Answer» If a man at the equator would weigh ${(\frac{3}{5})}^{t h}$ of his weight, the angular speed of the earth is

Discussion

28.	The angle between →A and resultant of (→A+→B) and (→A−→B) is
Answer» The angle between $\to A$ and resultant of $(\to A + \to B)$ and $(\to A - \to B)$ is

Discussion

29.	(a) Describe briefly three experimentally observed features in the phenomenon of photoelectric effect. (b) Discuss briefly how wave theory of light cannot explain these features.
Answer» (a) Describe briefly three experimentally observed features in the phenomenon of photoelectric effect. (b) Discuss briefly how wave theory of light cannot explain these features.

Discussion

30.	A block hangs from a string wrapped on a disc of radius 20 cm free to rotate about its axis which is fixed in a horizontal position. If the angular speed of the disc is 10 rad/s at some instant, with what speed is the block going down at that instant ?
Answer» A block hangs from a string wrapped on a disc of radius 20 cm free to rotate about its axis which is fixed in a horizontal position. If the angular speed of the disc is 10 rad/s at some instant, with what speed is the block going down at that instant ?

Discussion

31.	Show that moment of inertia of a solid body of any shape changes with temperature as I=I0(1+2αθ, where I0 is the moment of inertia at 0∘ C and α is the coefficient of linear expansion of the solid.
Answer» Show that moment of inertia of a solid body of any shape changes with temperature as $I = I_{0} (1 + 2 α θ$ , where $I_{0}$ is the moment of inertia at $0^{\circ} C$ and $α$ is the coefficient of linear expansion of the solid.

Discussion

32.	A bullet is fired from a canon with velocity 500 m/s. If the angle of projection is 15∘ and g=10 m/s2. Then the range is
Answer» A bullet is fired from a canon with velocity 500 m/s. If the angle of projection is $15^{\circ}$ and $g = 10 m / s^{2}$ . Then the range is

Discussion

33.	The Lyman series of hydrogen spectrum lies in the region
Answer» The Lyman series of hydrogen spectrum lies in the region

Discussion

34.	Simultaneous determination of exact position and momentum of an electron is
Answer» Simultaneous determination of exact position and momentum of an electron is

34.

Simultaneous determination of exact position and momentum of an electron is

Answer»

Simultaneous determination of exact position and momentum of an electron is

Discussion

35.	Find the density of Ammonia gas at 100∘C when confined by a pressure of 1600 mm Hg.
Answer» Find the density of Ammonia gas at $100^{\circ} C$ when confined by a pressure of 1600 mm Hg.

Discussion

36.	A ladder of length ‘a’ rests against the floor and a wall of a room. If the ladder begins to slide on the floor, then the locus of its middle point is
Answer» A ladder of length ‘a’ rests against the floor and a wall of a room. If the ladder begins to slide on the floor, then the locus of its middle point is

Discussion

37.	Two coherent monochromatic light beams of intensities I and 4I are superposed. The maximum and minimum possible intensities in the resulting beam are [IIT-JEE 1988; RPMT 1995; AIIMS 1997; MP PMT 1997;MP PET 1999; BHU 2002; KCET 2000, 05]
Answer» Two coherent monochromatic light beams of intensities I and 4I are superposed. The maximum and minimum possible intensities in the resulting beam are [IIT-JEE 1988; RPMT 1995; AIIMS 1997; MP PMT 1997;MP PET 1999; BHU 2002; KCET 2000, 05]

Discussion

38.	Find the equivalent resistance across the point a & b in the given Circuit.
Answer» Find the equivalent resistance across the point a & b in the given Circuit.

38.

Find the equivalent resistance across the point a & b in the given Circuit.

Answer»

Find the equivalent resistance across the point a & b in the given Circuit.

Discussion

39.	If \|→A×→B\|=√3→A.→B, then the value of \|→A+→B\| is
Answer» If $\| \to A \times \to B \| = \sqrt{3} \to A . \to B,$ then the value of $\| \to A + \to B \|$ is

Discussion

40.	A steel wire of linear mass density 9.8 g/m is stretched with a tension of 10 kg. It is kept between poles of an electromagnet and it vibrates in resonance when carrying an arc of frequency n. The frequency n is approximately
Answer» A steel wire of linear mass density 9.8 g/m is stretched with a tension of 10 kg. It is kept between poles of an electromagnet and it vibrates in resonance when carrying an arc of frequency n. The frequency n is approximately

Discussion

41.	The horizontal component of the earth's magnetic field at a place is 3×10−4T and the dip is tan−1(43) . A metal rod of length 0.25 m placed in the north-south position and is moved at a constant speed of 10 cm/s towards the east. The emf induced in the rod will be
Answer» The horizontal component of the earth's magnetic field at a place is $3 \times 10^{- 4} T$ and the dip is $t a n^{- 1} (\frac{4}{3})$ . A metal rod of length 0.25 m placed in the north-south position and is moved at a constant speed of 10 cm/s towards the east. The emf induced in the rod will be

Discussion

42.	A force varying with displacement(x) is given as F=ae−bx acts on a particle of mass m moving in a straight line. Find the work done on the particle in its displacement from origin to a distance d.
Answer» A force varying with displacement $(x)$ is given as $F = a e^{- b x}$ acts on a particle of mass $m$ moving in a straight line. Find the work done on the particle in its displacement from origin to a distance $d$ .

Discussion

43.	The following figure shows a logic gate circuit with two inputs A and B and the output C. The voltage wave front of A, B, and C are as shown below The logic circuit gate is
Answer» The following figure shows a logic gate circuit with two inputs A and B and the output C. The voltage wave front of A, B, and C are as shown below The logic circuit gate is

43.

The following figure shows a logic gate circuit with two inputs A and B and the output C. The voltage wave front of A, B, and C are as shown below The logic circuit gate is

Answer»

The following figure shows a logic gate circuit with two inputs A and B and the output C. The voltage wave front of A, B, and C are as shown below The logic circuit gate is

Discussion

44.	A heavy particle is projected with a velocity at an angle with the horizontal into a uniform gravitational field. The slope of the trajectory of the particle varies not according to which of the following curve?
Answer» A heavy particle is projected with a velocity at an angle with the horizontal into a uniform gravitational field. The slope of the trajectory of the particle varies not according to which of the following curve?

Discussion

45.	The figure shows four wire loops, with edge lengths of either L or 2L. All four loops will move through a region of uniform magnetic field →B (directed out of the page) at the same constant velocity. Rank the four loops according to the maximum magnitude of the e.m.f.(e) induced as they enter the field.
Answer» The figure shows four wire loops, with edge lengths of either $L o r 2 L$ . All four loops will move through a region of uniform magnetic field $\to B$ (directed out of the page) at the same constant velocity. Rank the four loops according to the maximum magnitude of the e.m.f. $(e)$ induced as they enter the field.

Discussion

46.	VA−VB of given circuit is [in volts]
Answer» $V_{A} - V_{B}$ of given circuit is [in volts]

Discussion

47.	A rod of length L is rotating with an angular velocity ω in a uniform magnetic field B0 as shown in figure. Potential difference between the ends of rod A and B is (Take OB=L4)
Answer» A rod of length L is rotating with an angular velocity $ω$ in a uniform magnetic field $B_{0}$ as shown in figure. Potential difference between the ends of rod A and B is (Take $O B = \frac{L}{4}$ )

Discussion

48.	An incompressible liquid flows as shown. The value of v2 is
Answer» An incompressible liquid flows as shown. The value of $v_{2}$ is

Discussion

49.	A particle of mass 2 kg initially at origin (0,0) moves with an initial velocity →V=4^i+4^j m/s. If a constant force →F=−20^j N is applied on the particle, the x−coordinate of the particle when its y−coordinate again becomes zero is
Answer» A particle of mass $2 kg$ initially at origin $(0, 0)$ moves with an initial velocity $\to V = 4^i + 4^j m/s$ . If a constant force $\to F = - 20^j N$ is applied on the particle, the $x -$ coordinate of the particle when its $y -$ coordinate again becomes zero is

Discussion

50.	The radius of the second Bohr orbit for hydrogen atom is: (Planck’s constant h=6.6262×10−34Js; mass of an electron =9.1091×10−31kg; charge of an electron e=1.60210×10−19C; permittivity of vacuum ϵϕ=8.854185×10−12kg−1m−3A2)
Answer» The radius of the second Bohr orbit for hydrogen atom is: (Planck’s constant $h = 6.6262 \times 10^{- 34} J s$ ; mass of an electron $= 9.1091 \times 10^{- 31} k g$ ; charge of an electron $e = 1.60210 \times 10^{- 19} C$ ; permittivity of vacuum $ϵ_{ϕ} = 8.854185 \times 10^{- 12} k g^{- 1} m^{- 3} A^{2})$

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Why does the friction increase for a car with wider wheels , even though friction doesn't depend on area?

You are given two identical looking bars A and B. One of them is a bar magnet, while the other is an iron bar. How will you distinguish them without using any other material?

A particle moves in the x−y plane under the influence of a force such that its linear momentum is →p(t)=A[cos(kt)^i−sin(kt)^j], where A and k are constants. The angle between the force and the momentum is :

Find the change in the internal energy of a gas when it absorbs 80 calories of heat and performs work equal to 170 joules

What is the slope of tangent from origin to the circle (x−5)2+y2=16

Why is a lead plate used in Rutherford's alpha-particle scattering experiment?

A motorcyclist moving with uniform retardation takes 10s and 20s to travel successive quarter kilometer.How much farther will he travel before coming to rest?

Work done in moving an electric charge and difference in potential is called potential difference here what is the work done

Initially, the spring is at its natural length and collision between blocks of mass m &amp; m is elastic. The horizontal surface is smooth. Then, maximum compression of the spring during the motion will be:

For a projectile projected from ground at an angle θ with horizontal, gT2=2R√3, where T is time of fight, R is horizontal range of projectile, g is acceleration due to gravity. The angle of projection (θ) is

Two springs of force constants k1 and k2 are connected as shown in the figure. The time period of vertical oscillations of mass m is given by

The moment of inertia of two spheres of equal masses about their diameters is the same. One is hallow, then the ratio of their diameters is

If we double the radius of a current carrying coil keeping the current unchanged. what happens to the magnetic field at its centre?

In a uniform magnetic field B, a wire in the form of a semicircle of radius r rotates about the diameter of the circle with an angular frequency ω. The axis of rotation is perpendicular to the field. If the total resistance of the circuit is R, the mean power generated per period of rotation is

Light from two source, each of same frequency and travelling in same direction, but with intensity in the ratio 4 :1 interfere. Find ratio of maximum to minimum intensity.

The ratio of Young's modulus of the material of two wires is 2 : 3. If the same stress is applied on both, then the ratio of elastic energy per unit volume will be

A body P strikes another body Q of mass that is p times that of body P and moving with a velocity that is 1q of the velocity of body P. If body P comes to rest, the coefficient of restitution is

A 500 kg car takes a round turn of radius 50 m with a velocity of 36 km/hr. The centripetal force is

Find x such that the four points A(4,1,2),B(5, x,6),C(5,1,-1) and D(7,4,0)are coplanar.

A body of mass 'm' collides against a wall with a velocity 'v' and retraces its path with the same speed. The change in momentum is (take initial direction of velocity as positive)

There are two bodies of masses 100 kg and 10000 kg separated by a distance 1 m. At what distance from the smaller body, the intensity of gravitational field will be zero

A 100 g iron ball having velocity 10 m/s collides with a wall at an angle 30o and rebounds with the same angle. If the period of contact between the ball and wall is 0.1 second, then the force experienced by the wall is

Wave pulse on a string shown in figure is moving to the right without changing shape. Consider two particles at positions x1=1.5 m and x2=2.5 m. Their transverse velocities at the moment shown in figure are along directions.

If a man at the equator would weigh (35)th of his weight, the angular speed of the earth is

The angle between →A and resultant of (→A+→B) and (→A−→B) is

(a) Describe briefly three experimentally observed features in the phenomenon of photoelectric effect. (b) Discuss briefly how wave theory of light cannot explain these features.

A block hangs from a string wrapped on a disc of radius 20 cm free to rotate about its axis which is fixed in a horizontal position. If the angular speed of the disc is 10 rad/s at some instant, with what speed is the block going down at that instant ?

Show that moment of inertia of a solid body of any shape changes with temperature as I=I0(1+2αθ, where I0 is the moment of inertia at 0∘ C and α is the coefficient of linear expansion of the solid.

A bullet is fired from a canon with velocity 500 m/s. If the angle of projection is 15∘ and g=10 m/s2. Then the range is

The Lyman series of hydrogen spectrum lies in the region

Simultaneous determination of exact position and momentum of an electron is

Find the density of Ammonia gas at 100∘C when confined by a pressure of 1600 mm Hg.

A ladder of length ‘a’ rests against the floor and a wall of a room. If the ladder begins to slide on the floor, then the locus of its middle point is

Two coherent monochromatic light beams of intensities I and 4I are superposed. The maximum and minimum possible intensities in the resulting beam are [IIT-JEE 1988; RPMT 1995; AIIMS 1997; MP PMT 1997;MP PET 1999; BHU 2002; KCET 2000, 05]

Find the equivalent resistance across the point a &amp; b in the given Circuit.

If |→A×→B|=√3→A.→B, then the value of |→A+→B| is

A steel wire of linear mass density 9.8 g/m is stretched with a tension of 10 kg. It is kept between poles of an electromagnet and it vibrates in resonance when carrying an arc of frequency n. The frequency n is approximately

The horizontal component of the earth's magnetic field at a place is 3×10−4T and the dip is tan−1(43) . A metal rod of length 0.25 m placed in the north-south position and is moved at a constant speed of 10 cm/s towards the east. The emf induced in the rod will be

A force varying with displacement(x) is given as F=ae−bx acts on a particle of mass m moving in a straight line. Find the work done on the particle in its displacement from origin to a distance d.

The following figure shows a logic gate circuit with two inputs A and B and the output C. The voltage wave front of A, B, and C are as shown below The logic circuit gate is

A heavy particle is projected with a velocity at an angle with the horizontal into a uniform gravitational field. The slope of the trajectory of the particle varies not according to which of the following curve?

VA−VB of given circuit is [in volts]

A rod of length L is rotating with an angular velocity ω in a uniform magnetic field B0 as shown in figure. Potential difference between the ends of rod A and B is (Take OB=L4)

An incompressible liquid flows as shown. The value of v2 is

A particle of mass 2 kg initially at origin (0,0) moves with an initial velocity →V=4^i+4^j m/s. If a constant force →F=−20^j N is applied on the particle, the x−coordinate of the particle when its y−coordinate again becomes zero is

The radius of the second Bohr orbit for hydrogen atom is: (Planck’s constant h=6.6262×10−34Js; mass of an electron =9.1091×10−31kg; charge of an electron e=1.60210×10−19C; permittivity of vacuum ϵϕ=8.854185×10−12kg−1m−3A2)

Initially, the spring is at its natural length and collision between blocks of mass m & m is elastic. The horizontal surface is smooth. Then, maximum compression of the spring during the motion will be:

Find the equivalent resistance across the point a & b in the given Circuit.