50278 + Interview Questions in Physics Page 67 InterviewSolution

3301.	An insect crawls up a hemispherical surface very slowly. The coefficient of friction between the insect and the surface is 13. If the line joining the center of the hemispherical surface to the insect makes an angle α with the vertical, the maximum possible value of α is given by
Answer» An insect crawls up a hemispherical surface very slowly. The coefficient of friction between the insect and the surface is $\frac{1}{3}$ . If the line joining the center of the hemispherical surface to the insect makes an angle $α$ with the vertical, the maximum possible value of $α$ is given by

3301.

An insect crawls up a hemispherical surface very slowly. The coefficient of friction between the insect and the surface is 13. If the line joining the center of the hemispherical surface to the insect makes an angle α with the vertical, the maximum possible value of α is given by

Answer»

An insect crawls up a hemispherical surface very slowly. The coefficient of friction between the insect and the surface is $\frac{1}{3}$ . If the line joining the center of the hemispherical surface to the insect makes an angle $α$ with the vertical, the maximum possible value of $α$ is given by

3302.	Two sinusoidal sound waves were generated from same source after a time gap of 2 sec what is the phase difference between them if their time period is 10s.
Answer» Two sinusoidal sound waves were generated from same source after a time gap of 2 sec what is the phase difference between them if their time period is 10s.

3303.	A heating coil of resistance 5 ohm is connected to a battery of internal resistance 20 ohm. What value of the shunt resistance should be connected across the heating coil so that the amount of heat generated in the coil is decreased to 1/9th of its former value?
Answer» A heating coil of resistance 5 ohm is connected to a battery of internal resistance 20 ohm. What value of the shunt resistance should be connected across the heating coil so that the amount of heat generated in the coil is decreased to 1/9th of its former value?

3304.	33. In the arrangement shown all surfaces are frictionless. The rod R is constrained to move vertically. The vertical acceleration of R is a1 and the horizontal acceleration of the wedge is a2 . The ratio a 1 upon a2 is equal to
Answer» 33. In the arrangement shown all surfaces are frictionless. The rod R is constrained to move vertically. The vertical acceleration of R is a1 and the horizontal acceleration of the wedge is a2 . The ratio a 1 upon a2 is equal to

3305.	Explanation of unit of time
Answer» Explanation of unit of time

3306.	At a place in a town, the horizontal component of earth’s magnetic field is 2.5 G and the angle of dip at that place is 60∘. The magnetic field of earth at this location is?
Answer» At a place in a town, the horizontal component of earth’s magnetic field is $2.5 G$ and the angle of dip at that place is $60^{\circ}$ . The magnetic field of earth at this location is?

3307.	In terms of Charles’ law explain why –273°C is the lowest possible temperature.
Answer» In terms of Charles’ law explain why –273°C is the lowest possible temperature.

3308.	which of the fpollowing graphs show the variation of Potential Energy of a body if it is taken to a height h and dropped from there?
Answer» which of the fpollowing graphs show the variation of Potential Energy of a body if it is taken to a height h and dropped from there?

3309.	a light ray is inclined to one face of the prism at an angle of 50 degree. if angle of prism is 70 degree and ray is deviated through an angle of 46 degree then angle which emergent ray makes with second face of prism is
Answer» a light ray is inclined to one face of the prism at an angle of 50 degree. if angle of prism is 70 degree and ray is deviated through an angle of 46 degree then angle which emergent ray makes with second face of prism is

3310.	A block of mass m starts moving with an initial velocity v0 at a distance L towards a stationary spring of stiffness K attached to the wall as shown in the figure.Find the distance travelled by block on smooth surface before coming to rest.Given that surface is rough only for distance L and friction coefficient μ is such that (12mv20>μmgL).
Answer» A block of mass $m$ starts moving with an initial velocity $v_{0}$ at a distance $L$ towards a stationary spring of stiffness $K$ attached to the wall as shown in the figure. Find the distance travelled by block on smooth surface before coming to rest. Given that surface is rough only for distance $L$ and friction coefficient $μ$ is such that $(\frac{1}{2} m v_{0}^{2} > μ m g L)$ .

3311.	If ∫x2−1x4+x2+1dx=12ln∣∣∣x2−x+Kx2+x+K∣∣∣+C, Then value of K is (where K is fixed constant and C is integration constant)
Answer» If $\int \frac{x^{2} - 1}{x^{4} + x^{2} + 1} d x = \frac{1}{2} ln ∣ ∣ ∣ \frac{x^{2} - x + K}{x^{2} + x + K} ∣ ∣ ∣ + C$ , Then value of $K$ is (where $K$ is fixed constant and $C$ is integration constant)

3312.	what are inertial and non inertial frames
Answer» what are inertial and non inertial frames

3313.	the eyepiece ald ai 4. Ratio of intensities of coherent waves in YDSE is 9:4. Ratio of intensities of minima to the maxima produced is (1) 2:3 (2) 4:9(3) 1:16(4) 1:25
Answer» the eyepiece ald ai 4. Ratio of intensities of coherent waves in YDSE is 9:4. Ratio of intensities of minima to the maxima produced is (1) 2:3 (2) 4:9(3) 1:16(4) 1:25

3314.	In a material the rnagnetic field intensity is H=1400A/m when magnitude flux density B=2 Wb/m2. When H is reduces to 700 A/m at B=1.4 Wb/m2 ,the change in permeability is454.73
Answer» In a material the rnagnetic field intensity is $H = 1400 A / m$ when magnitude flux density $B = 2 W b / m^{2}$ . When H is reduces to 700 A/m at $B = 1.4 W b / m^{2}$ ,the change in permeability is 454.73

3315.	What is rectilinear propagation of light?
Answer» What is rectilinear propagation of light?

3316.	A ball of mass m moving horizontally with velocity V0 strikes a block of same mass which is suspended by a light inextensible string of length l. After inelastic collision ,combined block rise upto position where string makes an angle of 60∘ with vertical. Find V0.
Answer» A ball of mass $m$ moving horizontally with velocity $V_{0}$ strikes a block of same mass which is suspended by a light inextensible string of length $l$ . After inelastic collision ,combined block rise upto position where string makes an angle of $60^{\circ}$ with vertical. Find $V_{0}$ .

3317.	Find the binding energy per nucleon of 197 79Au if its atomic mass is 196.96 u. The atomic mass of 11H is 1.007825 u, mass of neuton, mn=1.008665 u, mp=1.007276 u. c2=931 MeVu.Remember that atomic mass also contains the mass of electrons.
Answer» Find the binding energy per nucleon of $_{79}^{197} A u$ if its atomic mass is 196.96 u. The atomic mass of $_{1}^{1} H$ is 1.007825 u, mass of neuton, $m_{n} = 1.008665 u, m_{p} = 1.007276 u . c^{2} = 931 \frac{M e V}{u} .$ Remember that atomic mass also contains the mass of electrons.

3318.	To measure radius of curvature of a convex mirror using a spherometer it was found that I=(4.4+-0.1)cm and h=(0.085+-0.001)cm. Calculate the maximum possible error in the radius of curvature.
Answer» To measure radius of curvature of a convex mirror using a spherometer it was found that I=(4.4+-0.1)cm and h=(0.085+-0.001)cm. Calculate the maximum possible error in the radius of curvature.

3319.	.A dielectric slab of dielectric constant K is placed between the plates of a parallel plate capacitor carryingcharge q. The induced charge q' on the surface of slab is given by(1)q'=q-q/K (2)q'=-q+q/K (3)q'=q(1/K+1) (4)q'=-q(1+1/K)
Answer» .A dielectric slab of dielectric constant K is placed between the plates of a parallel plate capacitor carryingcharge q. The induced charge q' on the surface of slab is given by(1)q'=q-q/K (2)q'=-q+q/K (3)q'=q(1/K+1) (4)q'=-q(1+1/K)

3320.	A candle flame of length 3 cm is placed at a distance of 3 m from a wall. How far from the wall must a concave mirror be placed in order that it may form an image of flame 9 cm high on the wall?
Answer» A candle flame of length $3 cm$ is placed at a distance of $3 m$ from a wall. How far from the wall must a concave mirror be placed in order that it may form an image of flame $9 cm$ high on the wall?

3321.	Two identical small bodies each of mass m and charge Q is sudpended from a fixed Point. This whole system is taken into orbiting Satellite, find tension in strings
Answer» Two identical small bodies each of mass m and charge Q is sudpended from a fixed Point. This whole system is taken into orbiting Satellite, find tension in strings

3322.	In the previous question, R is:
Answer» In the previous question, R is:

3323.	A hot gas emits radiation of wavelengths 46.0 nm, 82.8 nm and 103.5 nm only. Assume that the atoms have only two excited states and the difference between consecutive energy levels decreases as energy is increased. Taking the energy of the highest energy state to be zero, find the energies of the ground state and the first excited state.
Answer» A hot gas emits radiation of wavelengths 46.0 nm, 82.8 nm and 103.5 nm only. Assume that the atoms have only two excited states and the difference between consecutive energy levels decreases as energy is increased. Taking the energy of the highest energy state to be zero, find the energies of the ground state and the first excited state.

3325.	Why does a railway track have a particular shape I ?
Answer» Why does a railway track have a particular shape I ?

3326.	Car has a velocity of 90 km per hour when It begin to asend a hill without the help from its engine . what height will it rise before coming to rest if one third of its energy is lost in overcoming the fictional force
Answer» Car has a velocity of 90 km per hour when It begin to asend a hill without the help from its engine . what height will it rise before coming to rest if one third of its energy is lost in overcoming the fictional force

Explore topic-wise InterviewSolutions in .

An insect crawls up a hemispherical surface very slowly. The coefficient of friction between the insect and the surface is 13. If the line joining the center of the hemispherical surface to the insect makes an angle α with the vertical, the maximum possible value of α is given by

Two sinusoidal sound waves were generated from same source after a time gap of 2 sec what is the phase difference between them if their time period is 10s.

A heating coil of resistance 5 ohm is connected to a battery of internal resistance 20 ohm. What value of the shunt resistance should be connected across the heating coil so that the amount of heat generated in the coil is decreased to 1/9th of its former value?

33. In the arrangement shown all surfaces are frictionless. The rod R is constrained to move vertically. The vertical acceleration of R is a1 and the horizontal acceleration of the wedge is a2 . The ratio a 1 upon a2 is equal to

Explanation of unit of time

At a place in a town, the horizontal component of earth’s magnetic field is 2.5 G and the angle of dip at that place is 60∘. The magnetic field of earth at this location is?

In terms of Charles’ law explain why –273°C is the lowest possible temperature.

which of the fpollowing graphs show the variation of Potential Energy of a body if it is taken to a height h and dropped from there?

a light ray is inclined to one face of the prism at an angle of 50 degree. if angle of prism is 70 degree and ray is deviated through an angle of 46 degree then angle which emergent ray makes with second face of prism is

If ∫x2−1x4+x2+1dx=12ln∣∣∣x2−x+Kx2+x+K∣∣∣+C, Then value of K is (where K is fixed constant and C is integration constant)

what are inertial and non inertial frames

the eyepiece ald ai 4. Ratio of intensities of coherent waves in YDSE is 9:4. Ratio of intensities of minima to the maxima produced is (1) 2:3 (2) 4:9(3) 1:16(4) 1:25

In a material the rnagnetic field intensity is H=1400A/m when magnitude flux density B=2 Wb/m2. When H is reduces to 700 A/m at B=1.4 Wb/m2 ,the change in permeability is454.73

What is rectilinear propagation of light?

A ball of mass m moving horizontally with velocity V0 strikes a block of same mass which is suspended by a light inextensible string of length l. After inelastic collision ,combined block rise upto position where string makes an angle of 60∘ with vertical. Find V0.

Find the binding energy per nucleon of 197 79Au if its atomic mass is 196.96 u. The atomic mass of 11H is 1.007825 u, mass of neuton, mn=1.008665 u, mp=1.007276 u. c2=931 MeVu.Remember that atomic mass also contains the mass of electrons.

To measure radius of curvature of a convex mirror using a spherometer it was found that I=(4.4+-0.1)cm and h=(0.085+-0.001)cm. Calculate the maximum possible error in the radius of curvature.

.A dielectric slab of dielectric constant K is placed between the plates of a parallel plate capacitor carryingcharge q. The induced charge q' on the surface of slab is given by(1)q'=q-q/K (2)q'=-q+q/K (3)q'=q(1/K+1) (4)q'=-q(1+1/K)

A candle flame of length 3 cm is placed at a distance of 3 m from a wall. How far from the wall must a concave mirror be placed in order that it may form an image of flame 9 cm high on the wall?

Two identical small bodies each of mass m and charge Q is sudpended from a fixed Point. This whole system is taken into orbiting Satellite, find tension in strings

In the previous question, R is:

A disc of mass M and radius R is rolling with angular speed ω on a horizontal plane as shown. The magnitude of angular momentum of the disc about the origin O is

Why does a railway track have a particular shape I ?

Car has a velocity of 90 km per hour when It begin to asend a hill without the help from its engine . what height will it rise before coming to rest if one third of its energy is lost in overcoming the fictional force

In the given circuit with the steady current, the potential drop across the capacitor is found to be Vx volts. Find the value of x (Give integer value)

Q. 1 Can 8000 has its significant figures as 2 and 3. Why or why not? Q. 2 How many significant figures are there in 85000 cm?

At what distance from a convex mirror of focal length 2.5 m should a boy stand so that his image has a height equal to half the original height ? The principal axis is perpendicular to the height

In a spherical capacitor with plate raddi a and b, the potential difference between plates is V. The electric Field between the plates at a radial distance r from centre is ?

The reading of the voltmeter (rms)in volts, for the circuit shown in the figure is 141.42

A ball is thrown vertically upward with a velocity u from the top of the tower

A neutron having kinetic energy 12.5 eV collides with a hydrogen atom at rest. Neglect the difference in mass between the neutron and the hydrogen atom and assume that the neutron does not leave its line of motion. Find the possible kinetic energies of the neutron after the event.

A closed hollow insulated cylinder is filled with a gas at 0∘C and also contains an insulated piston of negligible weight and negligible thickness at the middle point. The gas on one side of the piston is heated to 100∘C. If the piston moves by 5 cm, the length of the hollow cylinder is

116.Two blocks A and B each of mass 1 kg placed on a smooth horizontal surface. Two horizontal forces 5 N and 10 N are applied on the blocks A and B respectively as shown in figure. The block A does not slide on block B. Then the normal reaction acting between the two block is

two concentric shells have mass M andm and their radii are R and r whereR greater than r what is the gravitation potential at their commom center

Four resistances P, Q, R, X formed wheat stone bridge. The bridge is balanced when R=64Ω. If P and Q are inter changed to bridge is balanced for R=144Ω. The value of ‘X’ is

A gas present in a cylinder expands against a constant pressure of 1atm from a volume of 2 litres to 6litres in doing so it absorbs 800j heat from surrounding the change in internal energy by process in joule

A particlestarts from the origin at t= 0 s with a velocity of and moves in the x-y planewith a constant acceleration of .(a) At what time is thex-coordinateof the particle 16 m? What is the y-coordinateof the particle at that time?(b) What is the speed ofthe particle at the time?

Find force on 1 C charge at O in the figure Options 55k 100k 50k 5.5k

If position x=t3 2t + 5(m) then velocity at time t = 2 s is?

Graph of momentum^2 and mass

3327.	In the given circuit with the steady current, the potential drop across the capacitor is found to be Vx volts. Find the value of x (Give integer value)
Answer» In the given circuit with the steady current, the potential drop across the capacitor is found to be $\frac{V}{x} volts$ . Find the value of $x$ (Give integer value)

3328.	Q. 1 Can 8000 has its significant figures as 2 and 3. Why or why not? Q. 2 How many significant figures are there in 85000 cm?
Answer» Q. 1 Can 8000 has its significant figures as 2 and 3. Why or why not? Q. 2 How many significant figures are there in 85000 cm?

3329.	At what distance from a convex mirror of focal length 2.5 m should a boy stand so that his image has a height equal to half the original height ? The principal axis is perpendicular to the height
Answer» At what distance from a convex mirror of focal length 2.5 m should a boy stand so that his image has a height equal to half the original height ? The principal axis is perpendicular to the height

3330.	In a spherical capacitor with plate raddi a and b, the potential difference between plates is V. The electric Field between the plates at a radial distance r from centre is ?
Answer» In a spherical capacitor with plate raddi a and b, the potential difference between plates is V. The electric Field between the plates at a radial distance r from centre is ?

3331.	The reading of the voltmeter (rms)in volts, for the circuit shown in the figure is 141.42
Answer» The reading of the voltmeter (rms)in volts, for the circuit shown in the figure is 141.42

3332.	A ball is thrown vertically upward with a velocity u from the top of the tower
Answer» A ball is thrown vertically upward with a velocity u from the top of the tower

3333.	A neutron having kinetic energy 12.5 eV collides with a hydrogen atom at rest. Neglect the difference in mass between the neutron and the hydrogen atom and assume that the neutron does not leave its line of motion. Find the possible kinetic energies of the neutron after the event.
Answer» A neutron having kinetic energy 12.5 eV collides with a hydrogen atom at rest. Neglect the difference in mass between the neutron and the hydrogen atom and assume that the neutron does not leave its line of motion. Find the possible kinetic energies of the neutron after the event.

3334.	Two blocks A and B are connected to each other by a string and a spring of force constant k, as shown in the figure. The string passes over a frictionless pulley. Block B slides over the horizontal top surface of a stationary block C and block A slides along the vertical side of C both with the same uniform speed. If the coefficient of friction between the surfaces of the blocks is μ and the mass of block A is m, what is the mass of block B?
Answer» Two blocks A and B are connected to each other by a string and a spring of force constant k, as shown in the figure. The string passes over a frictionless pulley. Block B slides over the horizontal top surface of a stationary block C and block A slides along the vertical side of C both with the same uniform speed. If the coefficient of friction between the surfaces of the blocks is $μ$ and the mass of block A is m, what is the mass of block B?

3335.	A closed hollow insulated cylinder is filled with a gas at 0∘C and also contains an insulated piston of negligible weight and negligible thickness at the middle point. The gas on one side of the piston is heated to 100∘C. If the piston moves by 5 cm, the length of the hollow cylinder is
Answer» A closed hollow insulated cylinder is filled with a gas at $0^{\circ} C$ and also contains an insulated piston of negligible weight and negligible thickness at the middle point. The gas on one side of the piston is heated to $100^{\circ} C$ . If the piston moves by $5 cm$ , the length of the hollow cylinder is

3336.	116.Two blocks A and B each of mass 1 kg placed on a smooth horizontal surface. Two horizontal forces 5 N and 10 N are applied on the blocks A and B respectively as shown in figure. The block A does not slide on block B. Then the normal reaction acting between the two block is
Answer» 116.Two blocks A and B each of mass 1 kg placed on a smooth horizontal surface. Two horizontal forces 5 N and 10 N are applied on the blocks A and B respectively as shown in figure. The block A does not slide on block B. Then the normal reaction acting between the two block is