50278 + Interview Questions in Physics

1.	A particle of mass 40 g executes a simple harmonic motion of amplitude 2.0 cm. If the time period is 0.20 s, find the total mechanical energy of the system.
Answer» A particle of mass 40 g executes a simple harmonic motion of amplitude 2.0 cm. If the time period is 0.20 s, find the total mechanical energy of the system.

Discussion

2.	A uniform electric field of magnitude E0 is directed along the positive X - axis. If the potential V is zero at x = 0, then its value at X = + x will be
Answer» A uniform electric field of magnitude $E_{0}$ is directed along the positive X - axis. If the potential V is zero at x = 0, then its value at X = + x will be

Discussion

3.	The maximum separation between two points where acceleration due to gravity is half of that at the surface is[R is radius of Earth]
Answer» The maximum separation between two points where acceleration due to gravity is half of that at the surface is $[R$ is radius of Earth $]$

Discussion

4.	67. What is penetrating power of electron?and Why is penetrating power of electron in s orbital larger than any other orbital?
Answer» 67. What is penetrating power of electron?and Why is penetrating power of electron in s orbital larger than any other orbital?

Discussion

5.	Why is angular displacement vector quantity only for small values? Why is the direction of angular displacement perpendicular to the plane of rotation of object?
Answer» Why is angular displacement vector quantity only for small values? Why is the direction of angular displacement perpendicular to the plane of rotation of object?

Discussion

6.	29.If striked photon has λ = 3000 Å and λ ^° = 6000 Å. Then calculate the following: (1) Energy of striked photon (2) Threshold energy (3) Velocity (4) Stopping potential (5) If energy increases by 10 times then calculate kinetic energy and number of photons. (6) If the intensity increases by 10 times then calculate kinetic energy and number of photoelectrons.
Answer» 29.If striked photon has λ = 3000 Å and λ ^° = 6000 Å. Then calculate the following: (1) Energy of striked photon (2) Threshold energy (3) Velocity (4) Stopping potential (5) If energy increases by 10 times then calculate kinetic energy and number of photons. (6) If the intensity increases by 10 times then calculate kinetic energy and number of photoelectrons.

Discussion

7.	In the electrostatic field of two point charges Q and -Q kept certain distance apart,draw a closed surface through which electric flux is zero.
Answer» In the electrostatic field of two point charges Q and -Q kept certain distance apart,draw a closed surface through which electric flux is zero.

Discussion

8.	A small ball of radius 2 cm executes SHM in a hemispherical bowl of radius 42 cm. Find the time period of oscillation. Take π=3.14 and g=10 m/s2
Answer» A small ball of radius $2 cm$ executes SHM in a hemispherical bowl of radius $42 cm$ . Find the time period of oscillation. Take $π = 3.14$ and $g = 10 {m/s}^{2}$

Discussion

9.	A layer of benzene (μ1=1.5) 6 cm deep floats on water (μ2=1.33) 4 cm deep. When viewed vertically through air the apparent distance of the bottom of the vessel below the top surface of the benzene will be -
Answer» A layer of benzene $(μ_{1} = 1.5) 6 cm$ deep floats on water $(μ_{2} = 1.33) 4 cm$ deep. When viewed vertically through air the apparent distance of the bottom of the vessel below the top surface of the benzene will be -

Discussion

10.	A projectile is projected at an angle 45^° to horizontal. If H is the maximum height and R is the horizontal range, then relation between H and R is
Answer» A projectile is projected at an angle 45^° to horizontal. If H is the maximum height and R is the horizontal range, then relation between H and R is

Discussion

11.	A particle is projected with a velocity of √7 ms−1 at angle 60∘ with horizontal. Find the average velocity of the projectile between the instants of point of projection and reaching the highest point.
Answer» A particle is projected with a velocity of $\sqrt{7} {ms}^{- 1}$ at angle $60^{\circ}$ with horizontal. Find the average velocity of the projectile between the instants of point of projection and reaching the highest point.

Discussion

12.	the velocity of a body depends on time as v(in m/s)=20+5t(in s).the average velocity of the body between t=1s to t=3s is
Answer» the velocity of a body depends on time as v(in m/s)=20+5t(in s).the average velocity of the body between t=1s to t=3s is

Discussion

13.	The motion of a particle executing simple harmonic motion is described by the displacement function, x(t) = A cos (ωt + ∅ ). If the initial (t = 0) position of the particle is 1 cm and its initial velocity is ω cm/s, what are its amplitude and initial phase angle ? The angular frequency of the particle is p s–1. If instead of the cosine function, we choose the sine function to describe the SHM : x = B sin (ωt + α), what are the amplitude and initial phase of the particle with the above initial conditions.
Answer» The motion of a particle executing simple harmonic motion is described by the displacement function, x(t) = A cos (ωt + ∅ ). If the initial (t = 0) position of the particle is 1 cm and its initial velocity is ω cm/s, what are its amplitude and initial phase angle ? The angular frequency of the particle is p s–1. If instead of the cosine function, we choose the sine function to describe the SHM : x = B sin (ωt + α), what are the amplitude and initial phase of the particle with the above initial conditions.

Discussion

14.	Two identical circular discs each of radius 14 cm are kept 7 mm apart. If there is air between the plates, then the capacitance of this arrangement is(Take ε0=8.85×10−12 Fm−1)
Answer» Two identical circular discs each of radius $14 cm$ are kept $7 mm$ apart. If there is air between the plates, then the capacitance of this arrangement is $($ Take $ε_{0} = 8.85 \times 10^{- 12} {Fm}^{- 1})$

Discussion

15.	a hydrogen atom at rest emits a photon in going from n=5 to n=1 state, then recoil speed of atom is approximtely ?
Answer» a hydrogen atom at rest emits a photon in going from n=5 to n=1 state, then recoil speed of atom is approximtely ?

Discussion

16.	A plane mirror is placed on an inclined plane of inclination 30∘. An incident ray falling perpendicular to inclined plane gets reflected as shown. What is the value of angle of reflection 'x'?
Answer» A plane mirror is placed on an inclined plane of inclination $30^{\circ}$ . An incident ray falling perpendicular to inclined plane gets reflected as shown. What is the value of angle of reflection ' $x$ '?

16.

A plane mirror is placed on an inclined plane of inclination 30∘. An incident ray falling perpendicular to inclined plane gets reflected as shown. What is the value of angle of reflection 'x'?

Answer»

A plane mirror is placed on an inclined plane of inclination $30^{\circ}$ . An incident ray falling perpendicular to inclined plane gets reflected as shown. What is the value of angle of reflection ' $x$ '?

Discussion

17.	Two waves having same amplitude (A), wavelength (λ) and frequency (f) are propagating in the same direction. They interfere such that the amplitude of resultant wave is zero. The path difference between two wave can be :
Answer» Two waves having same amplitude $(A)$ , wavelength $(λ)$ and frequency $(f)$ are propagating in the same direction. They interfere such that the amplitude of resultant wave is zero. The path difference between two wave can be :

Discussion

18.	A thermopile is consisting of three identical thermocouples. The emf temperature relationship of a single thermocouple is given by V0=50TμV, where T is the temperature of heated source in (0C). If the output voltage measured across the thermopile is found to be 150mV then the approximate value of T in 0C is ?
Answer» A thermopile is consisting of three identical thermocouples. The emf temperature relationship of a single thermocouple is given by $V_{0} = 50 T μ V,$ where T is the temperature of heated source in $(^{0} C) .$ If the output voltage measured across the thermopile is found to be 150mV then the approximate value of $T i n^{0} C$ is ?

Discussion

19.	Show the capacitance of the spherical conductor is 4pi epsilon times the radius of the spherical conductor
Answer» Show the capacitance of the spherical conductor is 4pi epsilon times the radius of the spherical conductor

Discussion

20.	A boy of mass 20 kg on an initially stationary boat gets off the boat by jumping to the left in an exactly horizontal direction. Immediately after the jump, the boat of mass 40 kg is observed to be moving to the right at speed 2 m/s. How much work did the boy do during the jump?
Answer» A boy of mass $20 kg$ on an initially stationary boat gets off the boat by jumping to the left in an exactly horizontal direction. Immediately after the jump, the boat of mass $40 kg$ is observed to be moving to the right at speed $2 m/s$ . How much work did the boy do during the jump?

Discussion

21.	Two blocks A & B of mass m and 2m respectively are connected by a spring of spring constant k. the masses are moving to the right with a uniform velocity v' each, the heavier mass leading the lighter one. The spring has its natural length during this motion . Block B collides heea on with a third block C of mass 2m at rest , the collision being completely elastic. 1) then tell the velocity of block B just after collision. 2) the velocity of the COM of system of blocks A , B and C. is:- 3) maximum compression of the spring after collision is:-
Answer» Two blocks A & B of mass m and 2m respectively are connected by a spring of spring constant k. the masses are moving to the right with a uniform velocity v' each, the heavier mass leading the lighter one. The spring has its natural length during this motion . Block B collides heea on with a third block C of mass 2m at rest , the collision being completely elastic. 1) then tell the velocity of block B just after collision. 2) the velocity of the COM of system of blocks A , B and C. is:- 3) maximum compression of the spring after collision is:-

Discussion

22.	A bullet of mass 10g is fired horizontally into a 5kg wooden block, at rest on horizontal surface. The coefficient of kinetic friction between the block and the surface is 0.1 Calculate the speed of the bullet striking the block, if the combination moves 20m before coming to rest.
Answer» A bullet of mass 10g is fired horizontally into a 5kg wooden block, at rest on horizontal surface. The coefficient of kinetic friction between the block and the surface is 0.1 Calculate the speed of the bullet striking the block, if the combination moves 20m before coming to rest.

Discussion

23.	24.Two fixed frictionless inclined plane making anangle 30^° and 60 with the vertical are shown inthe figure. Two blocks A and B are placed on thetwo planes then what is the relative verticalcomponent of acceleration of A with respectto B:30^°(2) 9.8 m/s2(4) 4.9 m/s260^°(1) 19.6 m/s2(3) Zero
Answer» 24.Two fixed frictionless inclined plane making anangle 30^° and 60 with the vertical are shown inthe figure. Two blocks A and B are placed on thetwo planes then what is the relative verticalcomponent of acceleration of A with respectto B:30^°(2) 9.8 m/s2(4) 4.9 m/s260^°(1) 19.6 m/s2(3) Zero

Discussion

24.	In Young's double slit experiment, if monochromatic light is replaced by white light [AIIMS 2001; Kerala PET 2000; KCET 2004]
Answer» In Young's double slit experiment, if monochromatic light is replaced by white light [AIIMS 2001; Kerala PET 2000; KCET 2004]

24.

In Young's double slit experiment, if monochromatic light is replaced by white light [AIIMS 2001; Kerala PET 2000; KCET 2004]

Answer»

In Young's double slit experiment, if monochromatic light is replaced by white light

[AIIMS 2001; Kerala PET 2000; KCET 2004]

Discussion

25.	The power gain of a common emitter amplifier of voltage gain 50 and input impedance 100 ohm is 1250. Find its output impedance
Answer» The power gain of a common emitter amplifier of voltage gain 50 and input impedance 100 ohm is 1250. Find its output impedance

Discussion

26.	A boy of mass 20 kg on an initially stationary boat gets off the boat by jumping to the left in an exactly horizontal direction. Immediately after the jump, the boat of mass 40 kg is observed to be moving to the right at speed 2 m/s. How much work did the boy do during the jump?
Answer» A boy of mass $20 kg$ on an initially stationary boat gets off the boat by jumping to the left in an exactly horizontal direction. Immediately after the jump, the boat of mass $40 kg$ is observed to be moving to the right at speed $2 m/s$ . How much work did the boy do during the jump?

Discussion

27.	Consider the logic circuit given below:Then the logic expression for 'f' will be
Answer» Consider the logic circuit given below: Then the logic expression for 'f' will be

Discussion

28.	The electric field in the region between two parallel plates at time t2 is shown below. At t1=0, →E=0. The displacement current through the shown surfaces is id for the short interval (dt=t2−t1). Then -
Answer» The electric field in the region between two parallel plates at time $t_{2}$ is shown below. At $t_{1} = 0$ , $\to E = 0$ . The displacement current through the shown surfaces is $i_{d}$ for the short interval $(d t = t_{2} - t_{1})$ . Then -

Discussion

29.	A cord is wrapped around a pulley that is shaped like a disk of mass m and radius r. The cord's free end is connected to a block of mass M. The block starts from rest and then slides down an incline that makes an angle θ with the horizontal as shown in figure. The coefficient of kinetic friction between block and incline is μ. Then, the block's speed as a function of position d down the incline is
Answer» A cord is wrapped around a pulley that is shaped like a disk of mass $m$ and radius $r$ . The cord's free end is connected to a block of mass $M$ . The block starts from rest and then slides down an incline that makes an angle $θ$ with the horizontal as shown in figure. The coefficient of kinetic friction between block and incline is $μ$ . Then, the block's speed as a function of position $d$ down the incline is

Discussion

30.	How does a Zener Diode work and what is the difference between Reverse Bias p-n juction diode and Zener Diode?
Answer» How does a Zener Diode work and what is the difference between Reverse Bias p-n juction diode and Zener Diode?

Discussion

31.	An electron is accelerated by applying a potential difference of 5000 V find charge in kinetic energy and potential energy of electron also find final speed of electron
Answer» An electron is accelerated by applying a potential difference of 5000 V find charge in kinetic energy and potential energy of electron also find final speed of electron

Discussion

32.	If the radius of cross section of a conductor is increased by 0.1% keeing volume cons†an t,then ercentage change of resis†an ce of the conductor
Answer» If the radius of cross section of a conductor is increased by 0.1% keeing volume cons†an t,then ercentage change of resis†an ce of the conductor

Discussion

33.	Look at the graphs (a) to (d) (Fig. 3.20) carefully and state,with reasons, which of these cannot possibly representone-dimensional motion of a particle.(a) (b) (c) (d)
Answer» Look at the graphs (a) to (d) (Fig. 3.20) carefully and state, with reasons, which of these cannot possibly represent one-dimensional motion of a particle. (a) (b) (c) (d)

33.

Look at the graphs (a) to (d) (Fig. 3.20) carefully and state,with reasons, which of these cannot possibly representone-dimensional motion of a particle.(a) (b) (c) (d)

Answer»

Look at the graphs (a) to (d) (Fig. 3.20) carefully and state,
with reasons, which of these cannot possibly represent
one-dimensional motion of a particle.

(a)

(b)

(c)

(d)

Discussion

34.	calculate the time period of a charged particle '-q' placed on the axis of charged ring ,radius 'R' ,having linear charge distribution 'L' , where the charged particle is placed at 'x' from centre.[x
Answer» calculate the time period of a charged particle '-q' placed on the axis of charged ring ,radius 'R' ,having linear charge distribution 'L' , where the charged particle is placed at 'x' from centre.[x<<

Discussion

35.	52. what is black body radiation? how does it show that radiation (light) has particle nature?
Answer» 52. what is black body radiation? how does it show that radiation (light) has particle nature?

Discussion

36.	Two identiacal capacitors are charged to different potentials and then they are connected to each other in such a way such that the sum of charges of plates having positive polarity remains constant. Mark the correct statement.
Answer» Two identiacal capacitors are charged to different potentials and then they are connected to each other in such a way such that the sum of charges of plates having positive polarity remains constant. Mark the correct statement.

Discussion

37.	Two blocks (m=0.5 kg and M=4.5 kg) are arranged on a horizontal frictionless table as shown in the figure. The coefficient of static friction between the two blocks is 3/7. Then the maximum horizontal force that can be applied on the larger block so that blocks move together is ______N.(Round off to the nearest integer)(Take g as 9.8 ms−2)
Answer» Two blocks ( $m = 0.5 kg$ and $M = 4.5 kg$ ) are arranged on a horizontal frictionless table as shown in the figure. The coefficient of static friction between the two blocks is $3 / 7$ . Then the maximum horizontal force that can be applied on the larger block so that blocks move together is ______ $N$ . $($ Round off to the nearest integer $)$ $($ Take $g$ as $9.8 {ms}^{- 2})$

Discussion

38.	ntCalculate the frequency of particle wave, when the kinetic energy is 3.79 * 10raise to power -27n
Answer» ntCalculate the frequency of particle wave, when the kinetic energy is 3.79 * 10raise to power -27n

Discussion

39.	Two parallel vertical metallic rails AB and CD are separated by 1m. They are connected at the two ends by resistances R1 and R2 as shown. A horizontal metallic bar PQ of mass 0.2 kg slides without friction, vertically down the rails under the action of gravity. There is uniform horizontal magnetic field of 0.6T perpendicular to plane of the rails. It is observed that when the terminal velocity attained, the power dissipated in R1 and R2are 0.76 W and 1.2 W respectively. Find the terminal velocity of bar in ms (g=9.8 ms)2
Answer» Two parallel vertical metallic rails AB and CD are separated by 1m. They are connected at the two ends by resistances $R_{1}$ and $R_{2}$ as shown. A horizontal metallic bar PQ of mass 0.2 kg slides without friction, vertically down the rails under the action of gravity. There is uniform horizontal magnetic field of 0.6T perpendicular to plane of the rails. It is observed that when the terminal velocity attained, the power dissipated in $R_{1}$ and $R_{2}$ are 0.76 W and 1.2 W respectively. Find the terminal velocity of bar in $\frac{m}{s}$ ${(g = 9.8 \frac{m}{s})}^{2}$

Discussion

40.	28. Two masses m_1=1 kg and m_2 =0.5 kg are suspended together by massless spring of constant 12.5 Nm^{-1}, When masses are in equilibrium m_1 is removed without disturbing the system. New amplitude of oscillation will be(1) 30 cm(2) 80 cm3) 50 cm(4) 60 cm
Answer» 28. Two masses m_1=1 kg and m_2 =0.5 kg are suspended together by massless spring of constant 12.5 Nm^{-1}, When masses are in equilibrium m_1 is removed without disturbing the system. New amplitude of oscillation will be(1) 30 cm(2) 80 cm3) 50 cm(4) 60 cm

Discussion

41.	20% of 50% is what percentage of 25 % of 40 %
Answer» 20% of 50% is what percentage of 25 % of 40 %

Discussion

42.	The equation y=4sin(pi*t/2 + pi/3) represents the displacement of a particle executing SHM, the time period of the SHM is?
Answer» The equation y=4sin(pi*t/2 + pi/3) represents the displacement of a particle executing SHM, the time period of the SHM is?

Discussion

43.	In the circuit shown below, if the source voltage Vs=100∠53.13∘ Volts, then the Thevenin's equivalent voltage in Volts as seen by the load resistance RL is
Answer» In the circuit shown below, if the source voltage $V_{s} = 100 ∠ {53.13}^{\circ}$ Volts, then the Thevenin's equivalent voltage in Volts as seen by the load resistance R $_{L}$ is

Discussion

44.	what is net force? Tll me in simple words via animation.
Answer» what is net force? Tll me in simple words via animation.

Discussion

45.	The intensity level 1 m away from a point source is 40 dB. Threshold intensity of hearing is 10−12 W/m2. If there is no loss of power in air, then intensity level at 10 m from the source is
Answer» The intensity level $1 m$ away from a point source is $40 dB$ . Threshold intensity of hearing is $10^{- 12} {W/m}^{2}$ . If there is no loss of power in air, then intensity level at $10 m$ from the source is

Discussion

46.	A wire has poisson ratio is .3 .if thr change in the length of the wire on stretching it is 1% thennpercentage change in volume of the wire is
Answer» A wire has poisson ratio is .3 .if thr change in the length of the wire on stretching it is 1% thennpercentage change in volume of the wire is

Discussion

47.	In the given figure a ball strikes a rod at its end elastically and rod is hinged smoothly at point A. Then which of the statement(s) is/are correct (regarding just before and after the collision)
Answer» In the given figure a ball strikes a rod at its end elastically and rod is hinged smoothly at point A. Then which of the statement(s) is/are correct (regarding just before and after the collision)

47.

In the given figure a ball strikes a rod at its end elastically and rod is hinged smoothly at point A. Then which of the statement(s) is/are correct (regarding just before and after the collision)

Answer»

In the given figure a ball strikes a rod at its end elastically and rod is hinged smoothly at point A. Then which of the statement(s) is/are correct (regarding just before and after the collision)

Discussion

48.	If the apparent value of dip at a place in two perpendicular vertical planes are respectively 30∘ and 45∘, then the true angle of dip at that place is
Answer» If the apparent value of dip at a place in two perpendicular vertical planes are respectively $30^{\circ}$ and $45^{\circ}$ , then the true angle of dip at that place is

Discussion

49.	Photoelectric emission is observed from a metallic surface for frequencies v1 and v2 of the incident light rays (v1>v2). If the maximum values of kinetic energy of the photoelectrons emitted in the two cases are in the ratio of 1 : k, then the threshold frequency of the metallic surface is
Answer» Photoelectric emission is observed from a metallic surface for frequencies $v_{1}$ and $v_{2}$ of the incident light rays $(v_{1} > v_{2})$ . If the maximum values of kinetic energy of the photoelectrons emitted in the two cases are in the ratio of 1 : k, then the threshold frequency of the metallic surface is

Discussion

50.	A thin equiconvex lens of glass (μ=32) having a focal length of 30 cm is placed in air at a distance of 10 cm from a plane mirror, which is placed with its plane perpendicular to the optical axis of the lens. Water (μ=43) fills the space between lens and mirror. A parallel beam of light is incident on the lens parallel to the principal axis. Choose the correct option(s):
Answer» A thin equiconvex lens of glass $(μ = \frac{3}{2})$ having a focal length of 30 cm is placed in air at a distance of 10 cm from a plane mirror, which is placed with its plane perpendicular to the optical axis of the lens. Water $(μ = \frac{4}{3})$ fills the space between lens and mirror. A parallel beam of light is incident on the lens parallel to the principal axis. Choose the correct option(s):

50.

A thin equiconvex lens of glass (μ=32) having a focal length of 30 cm is placed in air at a distance of 10 cm from a plane mirror, which is placed with its plane perpendicular to the optical axis of the lens. Water (μ=43) fills the space between lens and mirror. A parallel beam of light is incident on the lens parallel to the principal axis. Choose the correct option(s):

Answer»

A thin equiconvex lens of glass $(μ = \frac{3}{2})$ having a focal length of 30 cm is placed in air at a distance of 10 cm from a plane mirror, which is placed with its plane perpendicular to the optical axis of the lens. Water $(μ = \frac{4}{3})$ fills the space between lens and mirror. A parallel beam of light is incident on the lens parallel to the principal axis. Choose the correct option(s):

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A particle of mass 40 g executes a simple harmonic motion of amplitude 2.0 cm. If the time period is 0.20 s, find the total mechanical energy of the system.

A uniform electric field of magnitude E0 is directed along the positive X - axis. If the potential V is zero at x = 0, then its value at X = + x will be

The maximum separation between two points where acceleration due to gravity is half of that at the surface is[R is radius of Earth]

67. What is penetrating power of electron?and Why is penetrating power of electron in s orbital larger than any other orbital?

Why is angular displacement vector quantity only for small values? Why is the direction of angular displacement perpendicular to the plane of rotation of object?

In the electrostatic field of two point charges Q and -Q kept certain distance apart,draw a closed surface through which electric flux is zero.

A small ball of radius 2 cm executes SHM in a hemispherical bowl of radius 42 cm. Find the time period of oscillation. Take π=3.14 and g=10 m/s2

A layer of benzene (μ1=1.5) 6 cm deep floats on water (μ2=1.33) 4 cm deep. When viewed vertically through air the apparent distance of the bottom of the vessel below the top surface of the benzene will be -

A projectile is projected at an angle 45^° to horizontal. If H is the maximum height and R is the horizontal range, then relation between H and R is

A particle is projected with a velocity of √7 ms−1 at angle 60∘ with horizontal. Find the average velocity of the projectile between the instants of point of projection and reaching the highest point.

the velocity of a body depends on time as v(in m/s)=20+5t(in s).the average velocity of the body between t=1s to t=3s is

Two identical circular discs each of radius 14 cm are kept 7 mm apart. If there is air between the plates, then the capacitance of this arrangement is(Take ε0=8.85×10−12 Fm−1)

a hydrogen atom at rest emits a photon in going from n=5 to n=1 state, then recoil speed of atom is approximtely ?

A plane mirror is placed on an inclined plane of inclination 30∘. An incident ray falling perpendicular to inclined plane gets reflected as shown. What is the value of angle of reflection 'x'?

Two waves having same amplitude (A), wavelength (λ) and frequency (f) are propagating in the same direction. They interfere such that the amplitude of resultant wave is zero. The path difference between two wave can be :

Show the capacitance of the spherical conductor is 4pi epsilon times the radius of the spherical conductor

A boy of mass 20 kg on an initially stationary boat gets off the boat by jumping to the left in an exactly horizontal direction. Immediately after the jump, the boat of mass 40 kg is observed to be moving to the right at speed 2 m/s. How much work did the boy do during the jump?

A bullet of mass 10g is fired horizontally into a 5kg wooden block, at rest on horizontal surface. The coefficient of kinetic friction between the block and the surface is 0.1 Calculate the speed of the bullet striking the block, if the combination moves 20m before coming to rest.

24.Two fixed frictionless inclined plane making anangle 30^° and 60 with the vertical are shown inthe figure. Two blocks A and B are placed on thetwo planes then what is the relative verticalcomponent of acceleration of A with respectto B:30^°(2) 9.8 m/s2(4) 4.9 m/s260^°(1) 19.6 m/s2(3) Zero

In Young's double slit experiment, if monochromatic light is replaced by white light [AIIMS 2001; Kerala PET 2000; KCET 2004]

The power gain of a common emitter amplifier of voltage gain 50 and input impedance 100 ohm is 1250. Find its output impedance

A boy of mass 20 kg on an initially stationary boat gets off the boat by jumping to the left in an exactly horizontal direction. Immediately after the jump, the boat of mass 40 kg is observed to be moving to the right at speed 2 m/s. How much work did the boy do during the jump?

Consider the logic circuit given below:Then the logic expression for 'f' will be

The electric field in the region between two parallel plates at time t2 is shown below. At t1=0, →E=0. The displacement current through the shown surfaces is id for the short interval (dt=t2−t1). Then -

How does a Zener Diode work and what is the difference between Reverse Bias p-n juction diode and Zener Diode?

An electron is accelerated by applying a potential difference of 5000 V find charge in kinetic energy and potential energy of electron also find final speed of electron

If the radius of cross section of a conductor is increased by 0.1% keeing volume cons†an t,then ercentage change of resis†an ce of the conductor

Look at the graphs (a) to (d) (Fig. 3.20) carefully and state,with reasons, which of these cannot possibly representone-dimensional motion of a particle.(a) (b) (c) (d)

calculate the time period of a charged particle '-q' placed on the axis of charged ring ,radius 'R' ,having linear charge distribution 'L' , where the charged particle is placed at 'x' from centre.[x

52. what is black body radiation? how does it show that radiation (light) has particle nature?

Two identiacal capacitors are charged to different potentials and then they are connected to each other in such a way such that the sum of charges of plates having positive polarity remains constant. Mark the correct statement.

ntCalculate the frequency of particle wave, when the kinetic energy is 3.79 * 10raise to power -27n

28. Two masses m_1=1 kg and m_2 =0.5 kg are suspended together by massless spring of constant 12.5 Nm^{-1}, When masses are in equilibrium m_1 is removed without disturbing the system. New amplitude of oscillation will be(1) 30 cm(2) 80 cm3) 50 cm(4) 60 cm

20% of 50% is what percentage of 25 % of 40 %

The equation y=4sin(pi*t/2 + pi/3) represents the displacement of a particle executing SHM, the time period of the SHM is?

In the circuit shown below, if the source voltage Vs=100∠53.13∘ Volts, then the Thevenin's equivalent voltage in Volts as seen by the load resistance RL is

what is net force? Tll me in simple words via animation.

The intensity level 1 m away from a point source is 40 dB. Threshold intensity of hearing is 10−12 W/m2. If there is no loss of power in air, then intensity level at 10 m from the source is

A wire has poisson ratio is .3 .if thr change in the length of the wire on stretching it is 1% thennpercentage change in volume of the wire is

In the given figure a ball strikes a rod at its end elastically and rod is hinged smoothly at point A. Then which of the statement(s) is/are correct (regarding just before and after the collision)

If the apparent value of dip at a place in two perpendicular vertical planes are respectively 30∘ and 45∘, then the true angle of dip at that place is

Photoelectric emission is observed from a metallic surface for frequencies v1 and v2 of the incident light rays (v1&gt;v2). If the maximum values of kinetic energy of the photoelectrons emitted in the two cases are in the ratio of 1 : k, then the threshold frequency of the metallic surface is

Photoelectric emission is observed from a metallic surface for frequencies v1 and v2 of the incident light rays (v1>v2). If the maximum values of kinetic energy of the photoelectrons emitted in the two cases are in the ratio of 1 : k, then the threshold frequency of the metallic surface is