50278 + Interview Questions in Physics Page 285 InterviewSolution

14201.	what will be the deviation produced when the ray of light is incident on a plane mirror at an angle of incidence 60 degre?e
Answer» what will be the deviation produced when the ray of light is incident on a plane mirror at an angle of incidence 60 degre?e

Discussion

14202.	21. An insect crawls inside a hemisphere of radius 10 cm. If the coefficient of friction between the insect and the surface is 1/1.414. Then find out the maximum angle upto which the insect can remain static?
Answer» 21. An insect crawls inside a hemisphere of radius 10 cm. If the coefficient of friction between the insect and the surface is 1/1.414. Then find out the maximum angle upto which the insect can remain static?

Discussion

14203.	16 kg oxygen gas expands at stp isobarically to occupy double of its original volume. The work done during the process is nearly
Answer» 16 kg oxygen gas expands at stp isobarically to occupy double of its original volume. The work done during the process is nearly

Discussion

14204.	A van covers the first 30 km in 30 min and the next 30 km in 40 min. Calculate the average speed for the entire journey.
Answer» A van covers the first 30 km in 30 min and the next 30 km in 40 min. Calculate the average speed for the entire journey.

Discussion

14205.	A particle is projected at an angle θ with horizontal with initial speed u when it makes an angle ϕ with horizontal its speed is
Answer» A particle is projected at an angle θ with horizontal with initial speed u when it makes an angle ϕ with horizontal its speed is

Discussion

14206.	nta particle executes shm with an amplitude a.the period of osscilation is T .the minimum time taken by the particle to travel half of the amplitude from the equilibrium position isn ntt/12n ntt/8n ntt/4n ntt/2n
Answer» nta particle executes shm with an amplitude a.the period of osscilation is T .the minimum time taken by the particle to travel half of the amplitude from the equilibrium position isn ntt/12n ntt/8n ntt/4n ntt/2n

Discussion

14207.	Two mirrors are kept at an angle 60∘ between them as shown in the fig. A ray of light strikes the first mirror and after reflection strikes the second mirror. If the final reflected ray goes parallel to the first mirror, calculate the angle of incidence.
Answer» Two mirrors are kept at an angle $60^{\circ}$ between them as shown in the fig. A ray of light strikes the first mirror and after reflection strikes the second mirror. If the final reflected ray goes parallel to the first mirror, calculate the angle of incidence.

Discussion

14208.	A thin walled copper wire pipe 3.0m long and 2cm in diameter carries a net charge of 5.8 MC distributed uniformly. what is electric field 8cm from pipe axis
Answer» A thin walled copper wire pipe 3.0m long and 2cm in diameter carries a net charge of 5.8 MC distributed uniformly. what is electric field 8cm from pipe axis

Discussion

14209.	Find the minimum coefficient of friction (μ0) between the 1 kg block and the surface so that the system of three masses doesn't move on the surface under the action of 20 N force. (Take g=10 ms−2)
Answer» Find the minimum coefficient of friction ( $μ_{0})$ between the $1 kg$ block and the surface so that the system of three masses doesn't move on the surface under the action of $20 N$ force. (Take $g = 10 {ms}^{- 2})$

Discussion

14210.	Consider the situation shown in figure (8-E2). The system is released from rest and the block of mass 1.0 kg is found to have a speed 0.3 m/s after it has descended through a distance of 1 m. Find the coefficient of kinetic friction between the block and the table.
Answer» Consider the situation shown in figure (8-E2). The system is released from rest and the block of mass 1.0 kg is found to have a speed 0.3 m/s after it has descended through a distance of 1 m. Find the coefficient of kinetic friction between the block and the table.

14210.

Consider the situation shown in figure (8-E2). The system is released from rest and the block of mass 1.0 kg is found to have a speed 0.3 m/s after it has descended through a distance of 1 m. Find the coefficient of kinetic friction between the block and the table.

Answer»

Consider the situation shown in figure (8-E2). The system is released from rest and the block of mass 1.0 kg is found to have a speed 0.3 m/s after it has descended through a distance of 1 m. Find the coefficient of kinetic friction between the block and the table.

Discussion

14211.	A man can see through a small hole the top end of the thin rod of height 10 cm placed as shown below. The beaker height is 30 cm and its radius 10 cm. When beaker is filled with a liquid upto 20 cm, he can see the lower end of rod. The refractive index of the liquid is
Answer» A man can see through a small hole the top end of the thin rod of height $10 cm$ placed as shown below. The beaker height is $30 cm$ and its radius $10 cm$ . When beaker is filled with a liquid upto $20 cm$ , he can see the lower end of rod. The refractive index of the liquid is

Discussion

14212.	A block of mass m is at rest on a rough inclinedplane of angle of inclination θ . If coefficient offriction between the block and the inclined plane isμ , then the minimum value of force along the planerequired to move the block on the plane is(3) m glucose+ sin0\rbrack(4) mg\lbrack sine-μ o0se\rbrack ldo dawn on
Answer» A block of mass m is at rest on a rough inclinedplane of angle of inclination θ . If coefficient offriction between the block and the inclined plane isμ , then the minimum value of force along the planerequired to move the block on the plane is(3) m glucose+ sin0\rbrack(4) mg\lbrack sine-μ o0se\rbrack ldo dawn on

Discussion

14213.	What is ohms law
Answer» What is ohms law

Discussion

14214.	A cricket fielder can throw the cricket ball with a speed vo. If he throws the ball while running with speed u at an angle θ to the horizontal, find(a) the effective angle to the horizontal at which the ball is projectedin air as seen by a spectator.(b) what will be time of flight?(c) what is the distance (horizontal range) from the point of projection at which the ball will land?
Answer» A cricket fielder can throw the cricket ball with a speed vo. If he throws the ball while running with speed u at an angle θ to the horizontal, find (a) the effective angle to the horizontal at which the ball is projected in air as seen by a spectator. (b) what will be time of flight? (c) what is the distance (horizontal range) from the point of projection at which the ball will land?

Discussion

14215.	Why theory of relativity does not apply on charges?
Answer» Why theory of relativity does not apply on charges?

Discussion

14216.	If y=cos−1x, Find d2ydx2 in terms of y alone.
Answer» If $y = {cos}^{- 1} x,$ Find $\frac{d^{2} y}{d x^{2}}$ in terms of $y$ alone.

Discussion

14217.	Three discs of the same mass and same radius R are placed as shown in figure. Find the COM of the system.
Answer» Three discs of the same mass and same radius $R$ are placed as shown in figure. Find the $C O M$ of the system.

Discussion

14218.	106. In simple pendulum at lowest point tangential acceleration is zero. Why?
Answer» 106. In simple pendulum at lowest point tangential acceleration is zero. Why?

Discussion

14219.	A piece of metal floats in mercury. The coefficients of volume expansion of the metal and mercury are γ1 and γ2 respectively. If their temperature is increased by ΔT, the fraction of the volume of metal submerged in mercury changes by a factor
Answer» A piece of metal floats in mercury. The coefficients of volume expansion of the metal and mercury are $γ_{1}$ and $γ_{2}$ respectively. If their temperature is increased by $Δ T$ , the fraction of the volume of metal submerged in mercury changes by a factor

Discussion

14220.	what is the magnification when the object is virtual and erect in case of the mirror
Answer» what is the magnification when the object is virtual and erect in case of the mirror

Discussion

14221.	A wire, fixed at both ends is seen to vibrate at a resonant frequency of 240 Hz and also at 320 Hz. (a) What could be the maximum value of the fundamental frequency ? (b) If transverse waves can travel on this string at a speed of 40 ms−1, what is its length ?
Answer» A wire, fixed at both ends is seen to vibrate at a resonant frequency of 240 Hz and also at 320 Hz. (a) What could be the maximum value of the fundamental frequency ? (b) If transverse waves can travel on this string at a speed of $40 m s^{- 1}$ , what is its length ?

Discussion

14222.	Ampere’s circuital law relates :
Answer» Ampere’s circuital law relates :

Discussion

14223.	A block of mass m having a charge q is placed on a smooth horizontal table and is connected to a wall through an unstressed spring of spring constant k as shown in figure (29-E1). A horizontal electric field E parallel to the spring is switched on. Find he amplitude of he resulting SHM of the block.
Answer» A block of mass m having a charge q is placed on a smooth horizontal table and is connected to a wall through an unstressed spring of spring constant k as shown in figure (29-E1). A horizontal electric field E parallel to the spring is switched on. Find he amplitude of he resulting SHM of the block.

Discussion

14224.	For a constant volumetric stress on an object, the fractional change in the object volume (ΔVV) and its bulk modulus (B) are related as
Answer» For a constant volumetric stress on an object, the fractional change in the object volume $(\frac{Δ V}{V})$ and its bulk modulus $(B)$ are related as

Discussion

14225.	28.Consider two concentric shell of radius R1 and R2 with charge Q1 and Q2. find the potential at a distance r ( R1
Answer» 28.Consider two concentric shell of radius R1 and R2 with charge Q1 and Q2. find the potential at a distance r ( R1

Discussion

14226.	A body is in equilibrium under the action of three force vectors A, B and C simultaneously. Show that A×B=B×C=C×A.
Answer» A body is in equilibrium under the action of three force vectors A, B and C simultaneously. Show that A×B=B×C=C×A.

Discussion

14227.	In an experiment to measure the internal resistance of a cell by potentiometer, it is found that the balance point is at a length of 2 m when the cell is shunted by a 5Ω resistance; and is at a length of 3 m when the cell is shunted by a 10Ω resistance. The internal resistance of the cell is, then
Answer» In an experiment to measure the internal resistance of a cell by potentiometer, it is found that the balance point is at a length of 2 m when the cell is shunted by a $5 Ω$ resistance; and is at a length of 3 m when the cell is shunted by a $10 Ω$ resistance. The internal resistance of the cell is, then

Discussion

14228.	When a ball is h meter high from a point O, its velocity is v0. When it is h meter below O, its velocity is 2v0. Find the maximum height from O it will acquire
Answer» When a ball is $h$ meter high from a point $O$ , its velocity is $v_{0}$ . When it is $h$ meter below $O$ , its velocity is $2 v_{0}$ . Find the maximum height from $O$ it will acquire

Discussion

14229.	The pressure inside two soap bubbles are 1.03 atm & 1.04 atm respectively. The ratio of their surface potential energy is
Answer» The pressure inside two soap bubbles are 1.03 atm & 1.04 atm respectively. The ratio of their surface potential energy is

Discussion

14230.	A block of mass 5 kg is moving in x− direction with a constant speed of 20 m/s. It is subjected to a retarding force of F=−0.1x joules/metre during its travel from x=20 m to x=30 m. Its final K.E. will be:
Answer» A block of mass $5 kg$ is moving in $x -$ direction with a constant speed of $20 m/s$ . It is subjected to a retarding force of $F = - 0.1 x joules/metre$ during its travel from $x = 20 m$ to $x = 30 m$ . Its final K.E. will be:

Discussion

14231.	In the figure, ABC is the cross-section of a right-angled prism and BCDE is the cross-section of a glass slab. The value of θ so that light incident normally on the face AB does not cross the face BC is[Given: sin−14/5=53∘]
Answer» In the figure, $A B C$ is the cross-section of a right-angled prism and $B C D E$ is the cross-section of a glass slab. The value of $θ$ so that light incident normally on the face $A B$ does not cross the face $B C$ is $[$ Given: ${sin}^{- 1} 4 / 5 = 53^{\circ}]$

Discussion

14232.	Vector A has a magnitude of 2 units and makes an angle of 0∘ with the positive x- axis, Vector B has a magnitude of 6 units and makes an angle of 30∘ (clock-wise) with the positive y- axis. Find the magnitude of the resultant of Vector A& B and also the angle that it makes with Vector A.
Answer» Vector A has a magnitude of 2 units and makes an angle of $0^{\circ}$ with the positive x- axis, Vector B has a magnitude of 6 units and makes an angle of $30^{\circ}$ (clock-wise) with the positive y- axis. Find the magnitude of the resultant of Vector A& B and also the angle that it makes with Vector A.

Discussion

14233.	During winter mornings why do people stand in the Sun? Explain.
Answer» During winter mornings why do people stand in the Sun? Explain.

Discussion

14234.	An electric dipole placed in uniform electric field the net force acting on the dipole is zero when angle between p and e is
Answer» An electric dipole placed in uniform electric field the net force acting on the dipole is zero when angle between p and e is

Discussion

14235.	Calculate the area of the parallelogram when adjacent sides are given by the vectors →A=2^i+3^j+4^k and →B=2^i−3^j+^k
Answer» Calculate the area of the parallelogram when adjacent sides are given by the vectors $\to A = 2^i + 3^j + 4^k$ and $\to B = 2^i - 3^j +^k$

Discussion

14236.	A body starting from rest moves with uniform acceleration on a horizontal surface. The body covers 3 consecutive equal distances from beginning in time t1, t2, and t3, seconds. The ratio of t1:t2:t3 is (1) 1:2:3 (2)1:√2:√3 (3) 1:(√2-1):(√3-√2) (4) √3:√2:1
Answer» A body starting from rest moves with uniform acceleration on a horizontal surface. The body covers 3 consecutive equal distances from beginning in time t1, t2, and t3, seconds. The ratio of t1:t2:t3 is (1) 1:2:3 (2)1:√2:√3 (3) 1:(√2-1):(√3-√2) (4) √3:√2:1

Discussion

14237.	Suppose the loop in Exercise 6.4 is stationary but the currentfeeding the electromagnet that produces the magnetic field isgradually reduced so that the field decreases from its initial valueof 0.3 T at the rate of 0.02 T s–1. If the cut is joined and the loophas a resistance of 1.6 W, how much power is dissipated by theloop as heat? What is the source of this power?
Answer» Suppose the loop in Exercise 6.4 is stationary but the currentfeeding the electromagnet that produces the magnetic field isgradually reduced so that the field decreases from its initial valueof 0.3 T at the rate of 0.02 T s–1. If the cut is joined and the loophas a resistance of 1.6 W, how much power is dissipated by theloop as heat? What is the source of this power?

Discussion

14238.	Distance (in units) of a point with position vector ⟨2,3,1⟩ from the line given by L:→r=⟨3,4,1⟩+λ⟨2,1,3⟩ is:
Answer» Distance $(in units)$ of a point with position vector $⟨ 2, 3, 1 ⟩$ from the line given by $L : \to r = ⟨ 3, 4, 1 ⟩ + λ ⟨ 2, 1, 3 ⟩$ is:

Discussion

14239.	71.In one dimensional motion, instantaneous speed v satisfies 0 ≤ v < vo (a) The displacement in time T must always take non-negative values. (b) The displacement x in time T satisfies – vo T < x < vo T. (c) The acceleration is always a non-negative number. (d) The motion has no turning points.
Answer» 71.In one dimensional motion, instantaneous speed v satisfies 0 ≤ v < vo (a) The displacement in time T must always take non-negative values. (b) The displacement x in time T satisfies – vo T < x < vo T. (c) The acceleration is always a non-negative number. (d) The motion has no turning points.

Discussion

14240.	a band playing music at frequency f is moving towards a wall with speed vb. A MOTORIST is following the band with speed vm. if v is speed of sound then the expression of beat frequency heard by motorist is
Answer» a band playing music at frequency f is moving towards a wall with speed vb. A MOTORIST is following the band with speed vm. if v is speed of sound then the expression of beat frequency heard by motorist is

Discussion

14241.	Maximum electric field on the axis of circular rimg carrying a charge q will be
Answer» Maximum electric field on the axis of circular rimg carrying a charge q will be

Discussion

14242.	In a certain oscillatory system (particle is performing SHM), the amplitude of motion is 5 m and the time period is 4 s. The minimum time taken (in s) by the particle for passing between points, which are at distance of 4 m and 3 m from the centre and on the same side of it is t. Then value of 45t is
Answer» In a certain oscillatory system (particle is performing SHM), the amplitude of motion is $5 m$ and the time period is $4 s$ . The minimum time taken (in $s$ ) by the particle for passing between points, which are at distance of $4 m$ and $3 m$ from the centre and on the same side of it is $t$ . Then value of $45 t$ is

Discussion

14243.	A wire of length L and cross-sectional area A is made of a material of Young's modulus Y. If the wire is stretched by an amount x, the work done during the stretching is
Answer» A wire of length $L$ and cross-sectional area $A$ is made of a material of Young's modulus $Y$ . If the wire is stretched by an amount $x$ , the work done during the stretching is

Discussion

14244.	A tube of length 1 m containing H2 is closed at one end. If the velocity of sound in air be 340 m/s. Then, the fundamental frequency and the next higher overtone in H2 are:
Answer» A tube of length $1 m$ containing $H_{2}$ is closed at one end. If the velocity of sound in air be $340 m/s$ . Then, the fundamental frequency and the next higher overtone in $H_{2}$ are:

Discussion

14245.	what happen to capaci†an ce if V is reduce to half & if charge Q is half.
Answer» what happen to capaci†an ce if V is reduce to half & if charge Q is half.

Discussion

14246.	Identify the thrust among the three different forces applied on the box as shown in the figure.
Answer» Identify the thrust among the three different forces applied on the box as shown in the figure.

Discussion

14247.	How nuclear force interact with each other?
Answer» How nuclear force interact with each other?

Discussion

14248.	A magnet drops down a long vertical copper tube. its velocity as it falls down the tubea)increasesb)remains constantc)decreasesd)first increase and then decreases
Answer» A magnet drops down a long vertical copper tube. its velocity as it falls down the tube a)increases b)remains constant c)decreases d)first increase and then decreases

Discussion

14249.	116.A car moving on a straight road AD, it have to reach at a point B in the field at a perpendicular distance 'l' from point D. Velocity on road is 'V' and velocity on field is 'n'times slower than the velocity on road. Find the distance from point D where car turns it so that it reach point B in minimum time
Answer» 116.A car moving on a straight road AD, it have to reach at a point B in the field at a perpendicular distance 'l' from point D. Velocity on road is 'V' and velocity on field is 'n'times slower than the velocity on road. Find the distance from point D where car turns it so that it reach point B in minimum time

Discussion

14250.	The position co-ordinates of an object are given by {x=2t^2,y=t^2-4t,z=3t-5. The average { velocity of the particle during the interval 0-1s is
Answer» The position co-ordinates of an object are given by {x=2t^2,y=t^2-4t,z=3t-5. The average { velocity of the particle during the interval 0-1s is

Discussion

Explore topic-wise InterviewSolutions in .

what will be the deviation produced when the ray of light is incident on a plane mirror at an angle of incidence 60 degre?e

21. An insect crawls inside a hemisphere of radius 10 cm. If the coefficient of friction between the insect and the surface is 1/1.414. Then find out the maximum angle upto which the insect can remain static?

16 kg oxygen gas expands at stp isobarically to occupy double of its original volume. The work done during the process is nearly

A van covers the first 30 km in 30 min and the next 30 km in 40 min. Calculate the average speed for the entire journey.

A particle is projected at an angle θ with horizontal with initial speed u when it makes an angle ϕ with horizontal its speed is

nta particle executes shm with an amplitude a.the period of osscilation is T .the minimum time taken by the particle to travel half of the amplitude from the equilibrium position isn ntt/12n ntt/8n ntt/4n ntt/2n

Two mirrors are kept at an angle 60∘ between them as shown in the fig. A ray of light strikes the first mirror and after reflection strikes the second mirror. If the final reflected ray goes parallel to the first mirror, calculate the angle of incidence.

A thin walled copper wire pipe 3.0m long and 2cm in diameter carries a net charge of 5.8 MC distributed uniformly. what is electric field 8cm from pipe axis

Find the minimum coefficient of friction (μ0) between the 1 kg block and the surface so that the system of three masses doesn't move on the surface under the action of 20 N force. (Take g=10 ms−2)

Consider the situation shown in figure (8-E2). The system is released from rest and the block of mass 1.0 kg is found to have a speed 0.3 m/s after it has descended through a distance of 1 m. Find the coefficient of kinetic friction between the block and the table.

A man can see through a small hole the top end of the thin rod of height 10 cm placed as shown below. The beaker height is 30 cm and its radius 10 cm. When beaker is filled with a liquid upto 20 cm, he can see the lower end of rod. The refractive index of the liquid is

What is ohms law

Why theory of relativity does not apply on charges?

If y=cos−1x, Find d2ydx2 in terms of y alone.

Three discs of the same mass and same radius R are placed as shown in figure. Find the COM of the system.

106. In simple pendulum at lowest point tangential acceleration is zero. Why?

A piece of metal floats in mercury. The coefficients of volume expansion of the metal and mercury are γ1 and γ2 respectively. If their temperature is increased by ΔT, the fraction of the volume of metal submerged in mercury changes by a factor

what is the magnification when the object is virtual and erect in case of the mirror

A wire, fixed at both ends is seen to vibrate at a resonant frequency of 240 Hz and also at 320 Hz. (a) What could be the maximum value of the fundamental frequency ? (b) If transverse waves can travel on this string at a speed of 40 ms−1, what is its length ?

Ampere’s circuital law relates :

For a constant volumetric stress on an object, the fractional change in the object volume (ΔVV) and its bulk modulus (B) are related as

28.Consider two concentric shell of radius R1 and R2 with charge Q1 and Q2. find the potential at a distance r ( R1

A body is in equilibrium under the action of three force vectors A, B and C simultaneously. Show that A×B=B×C=C×A.

When a ball is h meter high from a point O, its velocity is v0. When it is h meter below O, its velocity is 2v0. Find the maximum height from O it will acquire

The pressure inside two soap bubbles are 1.03 atm &amp; 1.04 atm respectively. The ratio of their surface potential energy is

A block of mass 5 kg is moving in x− direction with a constant speed of 20 m/s. It is subjected to a retarding force of F=−0.1x joules/metre during its travel from x=20 m to x=30 m. Its final K.E. will be:

In the figure, ABC is the cross-section of a right-angled prism and BCDE is the cross-section of a glass slab. The value of θ so that light incident normally on the face AB does not cross the face BC is[Given: sin−14/5=53∘]

Vector A has a magnitude of 2 units and makes an angle of 0∘ with the positive x- axis, Vector B has a magnitude of 6 units and makes an angle of 30∘ (clock-wise) with the positive y- axis. Find the magnitude of the resultant of Vector A&amp; B and also the angle that it makes with Vector A.

During winter mornings why do people stand in the Sun? Explain.

An electric dipole placed in uniform electric field the net force acting on the dipole is zero when angle between p and e is

Calculate the area of the parallelogram when adjacent sides are given by the vectors →A=2^i+3^j+4^k and →B=2^i−3^j+^k

A body starting from rest moves with uniform acceleration on a horizontal surface. The body covers 3 consecutive equal distances from beginning in time t1, t2, and t3, seconds. The ratio of t1:t2:t3 is (1) 1:2:3 (2)1:√2:√3 (3) 1:(√2-1):(√3-√2) (4) √3:√2:1

Distance (in units) of a point with position vector ⟨2,3,1⟩ from the line given by L:→r=⟨3,4,1⟩+λ⟨2,1,3⟩ is:

71.In one dimensional motion, instantaneous speed v satisfies 0 ≤ v < vo (a) The displacement in time T must always take non-negative values. (b) The displacement x in time T satisfies – vo T < x < vo T. (c) The acceleration is always a non-negative number. (d) The motion has no turning points.

a band playing music at frequency f is moving towards a wall with speed vb. A MOTORIST is following the band with speed vm. if v is speed of sound then the expression of beat frequency heard by motorist is

Maximum electric field on the axis of circular rimg carrying a charge q will be

A wire of length L and cross-sectional area A is made of a material of Young's modulus Y. If the wire is stretched by an amount x, the work done during the stretching is

A tube of length 1 m containing H2 is closed at one end. If the velocity of sound in air be 340 m/s. Then, the fundamental frequency and the next higher overtone in H2 are:

what happen to capaci†an ce if V is reduce to half & if charge Q is half.

Identify the thrust among the three different forces applied on the box as shown in the figure.

How nuclear force interact with each other?

A magnet drops down a long vertical copper tube. its velocity as it falls down the tubea)increasesb)remains constantc)decreasesd)first increase and then decreases

The position co-ordinates of an object are given by {x=2t^2,y=t^2-4t,z=3t-5. The average { velocity of the particle during the interval 0-1s is

The pressure inside two soap bubbles are 1.03 atm & 1.04 atm respectively. The ratio of their surface potential energy is

Vector A has a magnitude of 2 units and makes an angle of 0∘ with the positive x- axis, Vector B has a magnitude of 6 units and makes an angle of 30∘ (clock-wise) with the positive y- axis. Find the magnitude of the resultant of Vector A& B and also the angle that it makes with Vector A.